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chromium / chromium / src / 2f05d7ffa621967ac92a5dcae91173647fc735c4 / . / ui / views / win / hwnd_message_handler.cc
blob: ab5b7ab25d9b903d0619d32c635e6a65acc6f0ad [file] [log] [blame]
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/views/win/hwnd_message_handler.h"
#include <dwmapi.h>
#include <oleacc.h>
#include <shellapi.h>
#include <tchar.h>
#include <utility>
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/debug/alias.h"
#include "base/location.h"
#include "base/macros.h"
#include "base/single_thread_task_runner.h"
#include "base/threading/thread_task_runner_handle.h"
#include "base/trace_event/trace_event.h"
#include "base/win/scoped_gdi_object.h"
#include "base/win/windows_version.h"
#include "ui/base/touch/touch_enabled.h"
#include "ui/base/view_prop.h"
#include "ui/base/win/internal_constants.h"
#include "ui/base/win/lock_state.h"
#include "ui/base/win/mouse_wheel_util.h"
#include "ui/base/win/shell.h"
#include "ui/base/win/touch_input.h"
#include "ui/display/win/dpi.h"
#include "ui/display/win/screen_win.h"
#include "ui/events/event.h"
#include "ui/events/event_utils.h"
#include "ui/events/keycodes/keyboard_code_conversion_win.h"
#include "ui/events/win/system_event_state_lookup.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/geometry/insets.h"
#include "ui/gfx/icon_util.h"
#include "ui/gfx/path.h"
#include "ui/gfx/path_win.h"
#include "ui/gfx/win/direct_manipulation.h"
#include "ui/gfx/win/hwnd_util.h"
#include "ui/gfx/win/rendering_window_manager.h"
#include "ui/native_theme/native_theme_win.h"
#include "ui/views/views_delegate.h"
#include "ui/views/widget/monitor_win.h"
#include "ui/views/widget/widget_hwnd_utils.h"
#include "ui/views/win/fullscreen_handler.h"
#include "ui/views/win/hwnd_message_handler_delegate.h"
#include "ui/views/win/scoped_fullscreen_visibility.h"
#include "ui/views/win/windows_session_change_observer.h"
namespace views {
namespace {
// MoveLoopMouseWatcher is used to determine if the user canceled or completed a
// move. win32 doesn't appear to offer a way to determine the result of a move,
// so we install hooks to determine if we got a mouse up and assume the move
// completed.
class MoveLoopMouseWatcher {
public:
MoveLoopMouseWatcher(HWNDMessageHandler* host, bool hide_on_escape);
~MoveLoopMouseWatcher();
// Returns true if the mouse is up, or if we couldn't install the hook.
bool got_mouse_up() const { return got_mouse_up_; }
private:
// Instance that owns the hook. We only allow one instance to hook the mouse
// at a time.
static MoveLoopMouseWatcher* instance_;
// Key and mouse callbacks from the hook.
static LRESULT CALLBACK MouseHook(int n_code, WPARAM w_param, LPARAM l_param);
static LRESULT CALLBACK KeyHook(int n_code, WPARAM w_param, LPARAM l_param);
void Unhook();
// HWNDMessageHandler that created us.
HWNDMessageHandler* host_;
// Should the window be hidden when escape is pressed?
const bool hide_on_escape_;
// Did we get a mouse up?
bool got_mouse_up_;
// Hook identifiers.
HHOOK mouse_hook_;
HHOOK key_hook_;
DISALLOW_COPY_AND_ASSIGN(MoveLoopMouseWatcher);
};
// static
MoveLoopMouseWatcher* MoveLoopMouseWatcher::instance_ = NULL;
MoveLoopMouseWatcher::MoveLoopMouseWatcher(HWNDMessageHandler* host,
bool hide_on_escape)
: host_(host),
hide_on_escape_(hide_on_escape),
got_mouse_up_(false),
mouse_hook_(NULL),
key_hook_(NULL) {
// Only one instance can be active at a time.
if (instance_)
instance_->Unhook();
mouse_hook_ = SetWindowsHookEx(
WH_MOUSE, &MouseHook, NULL, GetCurrentThreadId());
if (mouse_hook_) {
instance_ = this;
// We don't care if setting the key hook succeeded.
key_hook_ = SetWindowsHookEx(
WH_KEYBOARD, &KeyHook, NULL, GetCurrentThreadId());
}
if (instance_ != this) {
// Failed installation. Assume we got a mouse up in this case, otherwise
// we'll think all drags were canceled.
got_mouse_up_ = true;
}
}
MoveLoopMouseWatcher::~MoveLoopMouseWatcher() {
Unhook();
}
void MoveLoopMouseWatcher::Unhook() {
if (instance_ != this)
return;
DCHECK(mouse_hook_);
UnhookWindowsHookEx(mouse_hook_);
if (key_hook_)
UnhookWindowsHookEx(key_hook_);
key_hook_ = NULL;
mouse_hook_ = NULL;
instance_ = NULL;
}
// static
LRESULT CALLBACK MoveLoopMouseWatcher::MouseHook(int n_code,
WPARAM w_param,
LPARAM l_param) {
DCHECK(instance_);
if (n_code == HC_ACTION && w_param == WM_LBUTTONUP)
instance_->got_mouse_up_ = true;
return CallNextHookEx(instance_->mouse_hook_, n_code, w_param, l_param);
}
// static
LRESULT CALLBACK MoveLoopMouseWatcher::KeyHook(int n_code,
WPARAM w_param,
LPARAM l_param) {
if (n_code == HC_ACTION && w_param == VK_ESCAPE) {
int value = TRUE;
DwmSetWindowAttribute(instance_->host_->hwnd(),
DWMWA_TRANSITIONS_FORCEDISABLED, &value,
sizeof(value));
if (instance_->hide_on_escape_)
instance_->host_->Hide();
}
return CallNextHookEx(instance_->key_hook_, n_code, w_param, l_param);
}
// Called from OnNCActivate.
BOOL CALLBACK EnumChildWindowsForRedraw(HWND hwnd, LPARAM lparam) {
DWORD process_id;
GetWindowThreadProcessId(hwnd, &process_id);
int flags = RDW_INVALIDATE | RDW_NOCHILDREN | RDW_FRAME;
if (process_id == GetCurrentProcessId())
flags |= RDW_UPDATENOW;
RedrawWindow(hwnd, NULL, NULL, flags);
return TRUE;
}
bool GetMonitorAndRects(const RECT& rect,
HMONITOR* monitor,
gfx::Rect* monitor_rect,
gfx::Rect* work_area) {
DCHECK(monitor);
DCHECK(monitor_rect);
DCHECK(work_area);
*monitor = MonitorFromRect(&rect, MONITOR_DEFAULTTONULL);
if (!*monitor)
return false;
MONITORINFO monitor_info = { 0 };
monitor_info.cbSize = sizeof(monitor_info);
GetMonitorInfo(*monitor, &monitor_info);
*monitor_rect = gfx::Rect(monitor_info.rcMonitor);
*work_area = gfx::Rect(monitor_info.rcWork);
return true;
}
struct FindOwnedWindowsData {
HWND window;
std::vector<Widget*> owned_widgets;
};
// Enables or disables the menu item for the specified command and menu.
void EnableMenuItemByCommand(HMENU menu, UINT command, bool enabled) {
UINT flags = MF_BYCOMMAND | (enabled ? MF_ENABLED : MF_DISABLED | MF_GRAYED);
EnableMenuItem(menu, command, flags);
}
// Callback used to notify child windows that the top level window received a
// DWMCompositionChanged message.
BOOL CALLBACK SendDwmCompositionChanged(HWND window, LPARAM param) {
SendMessage(window, WM_DWMCOMPOSITIONCHANGED, 0, 0);
return TRUE;
}
// The thickness of an auto-hide taskbar in pixels.
const int kAutoHideTaskbarThicknessPx = 2;
bool IsTopLevelWindow(HWND window) {
long style = ::GetWindowLong(window, GWL_STYLE);
if (!(style & WS_CHILD))
return true;
HWND parent = ::GetParent(window);
return !parent || (parent == ::GetDesktopWindow());
}
const int kTouchDownContextResetTimeout = 500;
// Windows does not flag synthesized mouse messages from touch in all cases.
// This causes us grief as we don't want to process touch and mouse messages
// concurrently. Hack as per msdn is to check if the time difference between
// the touch message and the mouse move is within 500 ms and at the same
// location as the cursor.
const int kSynthesizedMouseTouchMessagesTimeDifference = 500;
} // namespace
// A scoping class that prevents a window from being able to redraw in response
// to invalidations that may occur within it for the lifetime of the object.
//
// Why would we want such a thing? Well, it turns out Windows has some
// "unorthodox" behavior when it comes to painting its non-client areas.
// Occasionally, Windows will paint portions of the default non-client area
// right over the top of the custom frame. This is not simply fixed by handling
// WM_NCPAINT/WM_PAINT, with some investigation it turns out that this
// rendering is being done *inside* the default implementation of some message
// handlers and functions:
// . WM_SETTEXT
// . WM_SETICON
// . WM_NCLBUTTONDOWN
// . EnableMenuItem, called from our WM_INITMENU handler
// The solution is to handle these messages and call DefWindowProc ourselves,
// but prevent the window from being able to update itself for the duration of
// the call. We do this with this class, which automatically calls its
// associated Window's lock and unlock functions as it is created and destroyed.
// See documentation in those methods for the technique used.
//
// The lock only has an effect if the window was visible upon lock creation, as
// it doesn't guard against direct visiblility changes, and multiple locks may
// exist simultaneously to handle certain nested Windows messages.
//
// IMPORTANT: Do not use this scoping object for large scopes or periods of
// time! IT WILL PREVENT THE WINDOW FROM BEING REDRAWN! (duh).
//
// I would love to hear Raymond Chen's explanation for all this. And maybe a
// list of other messages that this applies to ;-)
class HWNDMessageHandler::ScopedRedrawLock {
public:
explicit ScopedRedrawLock(HWNDMessageHandler* owner)
: owner_(owner),
hwnd_(owner_->hwnd()),
was_visible_(owner_->IsVisible()),
cancel_unlock_(false),
force_(!(GetWindowLong(hwnd_, GWL_STYLE) & WS_CAPTION)) {
if (was_visible_ && ::IsWindow(hwnd_))
owner_->LockUpdates(force_);
}
~ScopedRedrawLock() {
if (!cancel_unlock_ && was_visible_ && ::IsWindow(hwnd_))
owner_->UnlockUpdates(force_);
}
// Cancel the unlock operation, call this if the Widget is being destroyed.
void CancelUnlockOperation() { cancel_unlock_ = true; }
private:
// The owner having its style changed.
HWNDMessageHandler* owner_;
// The owner's HWND, cached to avoid action after window destruction.
HWND hwnd_;
// Records the HWND visibility at the time of creation.
bool was_visible_;
// A flag indicating that the unlock operation was canceled.
bool cancel_unlock_;
// If true, perform the redraw lock regardless of Aero state.
bool force_;
DISALLOW_COPY_AND_ASSIGN(ScopedRedrawLock);
};
// static HWNDMessageHandler member initialization.
base::LazyInstance<HWNDMessageHandler::FullscreenWindowMonitorMap>
HWNDMessageHandler::fullscreen_monitor_map_ = LAZY_INSTANCE_INITIALIZER;
////////////////////////////////////////////////////////////////////////////////
// HWNDMessageHandler, public:
long HWNDMessageHandler::last_touch_message_time_ = 0;
HWNDMessageHandler::HWNDMessageHandler(HWNDMessageHandlerDelegate* delegate)
: msg_handled_(FALSE),
delegate_(delegate),
fullscreen_handler_(new FullscreenHandler),
waiting_for_close_now_(false),
use_system_default_icon_(false),
restored_enabled_(false),
current_cursor_(NULL),
previous_cursor_(NULL),
dpi_(0),
active_mouse_tracking_flags_(0),
is_right_mouse_pressed_on_caption_(false),
lock_updates_count_(0),
ignore_window_pos_changes_(false),
last_monitor_(NULL),
is_first_nccalc_(true),
menu_depth_(0),
id_generator_(0),
in_size_loop_(false),
touch_down_contexts_(0),
last_mouse_hwheel_time_(0),
dwm_transition_desired_(false),
sent_window_size_changing_(false),
left_button_down_on_caption_(false),
background_fullscreen_hack_(false),
autohide_factory_(this),
weak_factory_(this) {}
HWNDMessageHandler::~HWNDMessageHandler() {
delegate_ = NULL;
// Prevent calls back into this class via WNDPROC now that we've been
// destroyed.
ClearUserData();
}
void HWNDMessageHandler::Init(HWND parent, const gfx::Rect& bounds) {
TRACE_EVENT0("views", "HWNDMessageHandler::Init");
GetMonitorAndRects(bounds.ToRECT(), &last_monitor_, &last_monitor_rect_,
&last_work_area_);
// Create the window.
WindowImpl::Init(parent, bounds);
if (delegate_->HasFrame() && base::win::IsProcessPerMonitorDpiAware()) {
static auto enable_child_window_dpi_message_func = []() {
// Derived signature; not available in headers.
// This call gets Windows to scale the non-client area when WM_DPICHANGED
// is fired.
using EnableChildWindowDpiMessagePtr = LRESULT (WINAPI*)(HWND, BOOL);
return reinterpret_cast<EnableChildWindowDpiMessagePtr>(
GetProcAddress(GetModuleHandle(L"user32.dll"),
"EnableChildWindowDpiMessage"));
}();
if (enable_child_window_dpi_message_func)
enable_child_window_dpi_message_func(hwnd(), TRUE);
}
prop_window_target_.reset(new ui::ViewProp(hwnd(),
ui::WindowEventTarget::kWin32InputEventTarget,
static_cast<ui::WindowEventTarget*>(this)));
// Direct Manipulation is enabled on Windows 10+. The CreateInstance function
// returns NULL if Direct Manipulation is not available.
direct_manipulation_helper_ =
gfx::win::DirectManipulationHelper::CreateInstance();
if (direct_manipulation_helper_)
direct_manipulation_helper_->Initialize(hwnd());
// Disable pen flicks (http://crbug.com/506977)
base::win::DisableFlicks(hwnd());
}
void HWNDMessageHandler::InitModalType(ui::ModalType modal_type) {
if (modal_type == ui::MODAL_TYPE_NONE)
return;
// We implement modality by crawling up the hierarchy of windows starting
// at the owner, disabling all of them so that they don't receive input
// messages.
HWND start = ::GetWindow(hwnd(), GW_OWNER);
while (start) {
::EnableWindow(start, FALSE);
start = ::GetParent(start);
}
}
void HWNDMessageHandler::Close() {
if (!IsWindow(hwnd()))
return; // No need to do anything.
// Let's hide ourselves right away.
Hide();
// Modal dialog windows disable their owner windows; re-enable them now so
// they can activate as foreground windows upon this window's destruction.
RestoreEnabledIfNecessary();
// Re-enable flicks which removes the window property.
base::win::EnableFlicks(hwnd());
if (!waiting_for_close_now_) {
// And we delay the close so that if we are called from an ATL callback,
// we don't destroy the window before the callback returned (as the caller
// may delete ourselves on destroy and the ATL callback would still
// dereference us when the callback returns).
waiting_for_close_now_ = true;
base::ThreadTaskRunnerHandle::Get()->PostTask(
FROM_HERE,
base::Bind(&HWNDMessageHandler::CloseNow, weak_factory_.GetWeakPtr()));
}
}
void HWNDMessageHandler::CloseNow() {
// We may already have been destroyed if the selection resulted in a tab
// switch which will have reactivated the browser window and closed us, so
// we need to check to see if we're still a window before trying to destroy
// ourself.
waiting_for_close_now_ = false;
if (IsWindow(hwnd()))
DestroyWindow(hwnd());
}
gfx::Rect HWNDMessageHandler::GetWindowBoundsInScreen() const {
RECT r;
GetWindowRect(hwnd(), &r);
return gfx::Rect(r);
}
gfx::Rect HWNDMessageHandler::GetClientAreaBoundsInScreen() const {
RECT r;
GetClientRect(hwnd(), &r);
POINT point = { r.left, r.top };
ClientToScreen(hwnd(), &point);
return gfx::Rect(point.x, point.y, r.right - r.left, r.bottom - r.top);
}
gfx::Rect HWNDMessageHandler::GetRestoredBounds() const {
// If we're in fullscreen mode, we've changed the normal bounds to the monitor
// rect, so return the saved bounds instead.
if (IsFullscreen())
return fullscreen_handler_->GetRestoreBounds();
gfx::Rect bounds;
GetWindowPlacement(&bounds, NULL);
return bounds;
}
gfx::Rect HWNDMessageHandler::GetClientAreaBounds() const {
if (IsMinimized())
return gfx::Rect();
if (delegate_->WidgetSizeIsClientSize())
return GetClientAreaBoundsInScreen();
return GetWindowBoundsInScreen();
}
void HWNDMessageHandler::GetWindowPlacement(
gfx::Rect* bounds,
ui::WindowShowState* show_state) const {
WINDOWPLACEMENT wp;
wp.length = sizeof(wp);
const bool succeeded = !!::GetWindowPlacement(hwnd(), &wp);
DCHECK(succeeded);
if (bounds != NULL) {
if (wp.showCmd == SW_SHOWNORMAL) {
// GetWindowPlacement can return misleading position if a normalized
// window was resized using Aero Snap feature (see comment 9 in bug
// 36421). As a workaround, using GetWindowRect for normalized windows.
const bool succeeded = GetWindowRect(hwnd(), &wp.rcNormalPosition) != 0;
DCHECK(succeeded);
*bounds = gfx::Rect(wp.rcNormalPosition);
} else {
MONITORINFO mi;
mi.cbSize = sizeof(mi);
const bool succeeded = GetMonitorInfo(
MonitorFromWindow(hwnd(), MONITOR_DEFAULTTONEAREST), &mi) != 0;
DCHECK(succeeded);
*bounds = gfx::Rect(wp.rcNormalPosition);
// Convert normal position from workarea coordinates to screen
// coordinates.
bounds->Offset(mi.rcWork.left - mi.rcMonitor.left,
mi.rcWork.top - mi.rcMonitor.top);
}
}
if (show_state) {
if (wp.showCmd == SW_SHOWMAXIMIZED)
*show_state = ui::SHOW_STATE_MAXIMIZED;
else if (wp.showCmd == SW_SHOWMINIMIZED)
*show_state = ui::SHOW_STATE_MINIMIZED;
else
*show_state = ui::SHOW_STATE_NORMAL;
}
}
void HWNDMessageHandler::SetBounds(const gfx::Rect& bounds_in_pixels,
bool force_size_changed) {
background_fullscreen_hack_ = false;
SetBoundsInternal(bounds_in_pixels, force_size_changed);
}
void HWNDMessageHandler::SetDwmFrameExtension(DwmFrameState state) {
if (!delegate_->HasFrame() && ui::win::IsAeroGlassEnabled() &&
(window_ex_style() & WS_EX_COMPOSITED) == 0) {
MARGINS m = {0, 0, 0, 0};
if (state == DwmFrameState::ON)
m = {0, 0, 1, 0};
DwmExtendFrameIntoClientArea(hwnd(), &m);
}
}
void HWNDMessageHandler::SetSize(const gfx::Size& size) {
SetWindowPos(hwnd(), NULL, 0, 0, size.width(), size.height(),
SWP_NOACTIVATE | SWP_NOZORDER | SWP_NOMOVE);
}
void HWNDMessageHandler::CenterWindow(const gfx::Size& size) {
HWND parent = GetParent(hwnd());
if (!IsWindow(hwnd()))
parent = ::GetWindow(hwnd(), GW_OWNER);
gfx::CenterAndSizeWindow(parent, hwnd(), size);
}
void HWNDMessageHandler::SetRegion(HRGN region) {
custom_window_region_.reset(region);
ResetWindowRegion(true, true);
}
void HWNDMessageHandler::StackAbove(HWND other_hwnd) {
// Windows API allows to stack behind another windows only.
DCHECK(other_hwnd);
HWND next_window = GetNextWindow(other_hwnd, GW_HWNDPREV);
SetWindowPos(hwnd(), next_window ? next_window : HWND_TOP, 0, 0, 0, 0,
SWP_NOSIZE | SWP_NOMOVE | SWP_NOACTIVATE);
}
void HWNDMessageHandler::StackAtTop() {
SetWindowPos(hwnd(), HWND_TOP, 0, 0, 0, 0,
SWP_NOSIZE | SWP_NOMOVE | SWP_NOACTIVATE);
}
void HWNDMessageHandler::Show() {
if (IsWindow(hwnd())) {
if (!(GetWindowLong(hwnd(), GWL_EXSTYLE) & WS_EX_TRANSPARENT) &&
!(GetWindowLong(hwnd(), GWL_EXSTYLE) & WS_EX_NOACTIVATE)) {
ShowWindowWithState(ui::SHOW_STATE_NORMAL);
} else {
ShowWindowWithState(ui::SHOW_STATE_INACTIVE);
}
}
if (direct_manipulation_helper_)
direct_manipulation_helper_->Activate(hwnd());
}
void HWNDMessageHandler::ShowWindowWithState(ui::WindowShowState show_state) {
TRACE_EVENT0("views", "HWNDMessageHandler::ShowWindowWithState");
DWORD native_show_state;
switch (show_state) {
case ui::SHOW_STATE_INACTIVE:
native_show_state = SW_SHOWNOACTIVATE;
break;
case ui::SHOW_STATE_MAXIMIZED:
native_show_state = SW_SHOWMAXIMIZED;
break;
case ui::SHOW_STATE_MINIMIZED:
native_show_state = SW_SHOWMINIMIZED;
break;
case ui::SHOW_STATE_NORMAL:
native_show_state = SW_SHOWNORMAL;
break;
case ui::SHOW_STATE_FULLSCREEN:
native_show_state = SW_SHOWNORMAL;
SetFullscreen(true);
break;
default:
native_show_state = delegate_->GetInitialShowState();
break;
}
ShowWindow(hwnd(), native_show_state);
// When launched from certain programs like bash and Windows Live Messenger,
// show_state is set to SW_HIDE, so we need to correct that condition. We
// don't just change show_state to SW_SHOWNORMAL because MSDN says we must
// always first call ShowWindow with the specified value from STARTUPINFO,
// otherwise all future ShowWindow calls will be ignored (!!#@@#!). Instead,
// we call ShowWindow again in this case.
if (native_show_state == SW_HIDE) {
native_show_state = SW_SHOWNORMAL;
ShowWindow(hwnd(), native_show_state);
}
// We need to explicitly activate the window if we've been shown with a state
// that should activate, because if we're opened from a desktop shortcut while
// an existing window is already running it doesn't seem to be enough to use
// one of these flags to activate the window.
if (native_show_state == SW_SHOWNORMAL ||
native_show_state == SW_SHOWMAXIMIZED)
Activate();
if (!delegate_->HandleInitialFocus(show_state))
SetInitialFocus();
}
void HWNDMessageHandler::ShowMaximizedWithBounds(const gfx::Rect& bounds) {
WINDOWPLACEMENT placement = { 0 };
placement.length = sizeof(WINDOWPLACEMENT);
placement.showCmd = SW_SHOWMAXIMIZED;
placement.rcNormalPosition = bounds.ToRECT();
SetWindowPlacement(hwnd(), &placement);
// We need to explicitly activate the window, because if we're opened from a
// desktop shortcut while an existing window is already running it doesn't
// seem to be enough to use SW_SHOWMAXIMIZED to activate the window.
Activate();
}
void HWNDMessageHandler::Hide() {
if (IsWindow(hwnd())) {
// NOTE: Be careful not to activate any windows here (for example, calling
// ShowWindow(SW_HIDE) will automatically activate another window). This
// code can be called while a window is being deactivated, and activating
// another window will screw up the activation that is already in progress.
SetWindowPos(hwnd(), NULL, 0, 0, 0, 0,
SWP_HIDEWINDOW | SWP_NOACTIVATE | SWP_NOMOVE |
SWP_NOREPOSITION | SWP_NOSIZE | SWP_NOZORDER);
}
}
void HWNDMessageHandler::Maximize() {
ExecuteSystemMenuCommand(SC_MAXIMIZE);
}
void HWNDMessageHandler::Minimize() {
ExecuteSystemMenuCommand(SC_MINIMIZE);
delegate_->HandleNativeBlur(NULL);
}
void HWNDMessageHandler::Restore() {
ExecuteSystemMenuCommand(SC_RESTORE);
}
void HWNDMessageHandler::Activate() {
if (IsMinimized())
::ShowWindow(hwnd(), SW_RESTORE);
::SetWindowPos(hwnd(), HWND_TOP, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE);
SetForegroundWindow(hwnd());
}
void HWNDMessageHandler::Deactivate() {
HWND next_hwnd = ::GetNextWindow(hwnd(), GW_HWNDNEXT);
while (next_hwnd) {
if (::IsWindowVisible(next_hwnd)) {
::SetForegroundWindow(next_hwnd);
return;
}
next_hwnd = ::GetNextWindow(next_hwnd, GW_HWNDNEXT);
}
}
void HWNDMessageHandler::SetAlwaysOnTop(bool on_top) {
::SetWindowPos(hwnd(), on_top ? HWND_TOPMOST : HWND_NOTOPMOST,
0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE);
}
bool HWNDMessageHandler::IsVisible() const {
return !!::IsWindowVisible(hwnd());
}
bool HWNDMessageHandler::IsActive() const {
return GetActiveWindow() == hwnd();
}
bool HWNDMessageHandler::IsMinimized() const {
return !!::IsIconic(hwnd());
}
bool HWNDMessageHandler::IsMaximized() const {
return !!::IsZoomed(hwnd()) && !IsFullscreen();
}
bool HWNDMessageHandler::IsFullscreen() const {
return fullscreen_handler_->fullscreen();
}
bool HWNDMessageHandler::IsAlwaysOnTop() const {
return (GetWindowLong(hwnd(), GWL_EXSTYLE) & WS_EX_TOPMOST) != 0;
}
bool HWNDMessageHandler::RunMoveLoop(const gfx::Vector2d& drag_offset,
bool hide_on_escape) {
ReleaseCapture();
MoveLoopMouseWatcher watcher(this, hide_on_escape);
// In Aura, we handle touch events asynchronously. So we need to allow nested
// tasks while in windows move loop.
base::MessageLoop::ScopedNestableTaskAllower allow_nested(
base::MessageLoop::current());
SendMessage(hwnd(), WM_SYSCOMMAND, SC_MOVE | 0x0002, GetMessagePos());
// Windows doesn't appear to offer a way to determine whether the user
// canceled the move or not. We assume if the user released the mouse it was
// successful.
return watcher.got_mouse_up();
}
void HWNDMessageHandler::EndMoveLoop() {
SendMessage(hwnd(), WM_CANCELMODE, 0, 0);
}
void HWNDMessageHandler::SendFrameChanged() {
SetWindowPos(hwnd(), NULL, 0, 0, 0, 0,
SWP_FRAMECHANGED | SWP_NOACTIVATE | SWP_NOCOPYBITS |
SWP_NOMOVE | SWP_NOOWNERZORDER | SWP_NOREPOSITION |
SWP_NOSENDCHANGING | SWP_NOSIZE | SWP_NOZORDER);
}
void HWNDMessageHandler::FlashFrame(bool flash) {
FLASHWINFO fwi;
fwi.cbSize = sizeof(fwi);
fwi.hwnd = hwnd();
if (flash) {
fwi.dwFlags = custom_window_region_.is_valid() ? FLASHW_TRAY : FLASHW_ALL;
fwi.uCount = 4;
fwi.dwTimeout = 0;
} else {
fwi.dwFlags = FLASHW_STOP;
}
FlashWindowEx(&fwi);
}
void HWNDMessageHandler::ClearNativeFocus() {
::SetFocus(hwnd());
}
void HWNDMessageHandler::SetCapture() {
DCHECK(!HasCapture());
::SetCapture(hwnd());
}
void HWNDMessageHandler::ReleaseCapture() {
if (HasCapture())
::ReleaseCapture();
}
bool HWNDMessageHandler::HasCapture() const {
return ::GetCapture() == hwnd();
}
void HWNDMessageHandler::SetVisibilityChangedAnimationsEnabled(bool enabled) {
int dwm_value = enabled ? FALSE : TRUE;
DwmSetWindowAttribute(hwnd(), DWMWA_TRANSITIONS_FORCEDISABLED, &dwm_value,
sizeof(dwm_value));
}
bool HWNDMessageHandler::SetTitle(const base::string16& title) {
base::string16 current_title;
size_t len_with_null = GetWindowTextLength(hwnd()) + 1;
if (len_with_null == 1 && title.length() == 0)
return false;
if (len_with_null - 1 == title.length() &&
GetWindowText(hwnd(),
base::WriteInto(&current_title, len_with_null),
len_with_null) &&
current_title == title)
return false;
SetWindowText(hwnd(), title.c_str());
return true;
}
void HWNDMessageHandler::SetCursor(HCURSOR cursor) {
if (cursor) {
previous_cursor_ = ::SetCursor(cursor);
current_cursor_ = cursor;
} else if (previous_cursor_) {
::SetCursor(previous_cursor_);
previous_cursor_ = NULL;
}
}
void HWNDMessageHandler::FrameTypeChanged() {
if (!custom_window_region_.is_valid() &&
delegate_->GetFrameMode() == FrameMode::SYSTEM_DRAWN)
dwm_transition_desired_ = true;
if (!dwm_transition_desired_ || !IsFullscreen())
PerformDwmTransition();
}
void HWNDMessageHandler::SetWindowIcons(const gfx::ImageSkia& window_icon,
const gfx::ImageSkia& app_icon) {
if (!window_icon.isNull()) {
base::win::ScopedHICON previous_icon = std::move(window_icon_);
window_icon_ = IconUtil::CreateHICONFromSkBitmap(*window_icon.bitmap());
SendMessage(hwnd(), WM_SETICON, ICON_SMALL,
reinterpret_cast<LPARAM>(window_icon_.get()));
}
if (!app_icon.isNull()) {
base::win::ScopedHICON previous_icon = std::move(app_icon_);
app_icon_ = IconUtil::CreateHICONFromSkBitmap(*app_icon.bitmap());
SendMessage(hwnd(), WM_SETICON, ICON_BIG,
reinterpret_cast<LPARAM>(app_icon_.get()));
}
}
void HWNDMessageHandler::SetFullscreen(bool fullscreen) {
background_fullscreen_hack_ = false;
fullscreen_handler()->SetFullscreen(fullscreen);
// If we are out of fullscreen and there was a pending DWM transition for the
// window, then go ahead and do it now.
if (!fullscreen && dwm_transition_desired_)
PerformDwmTransition();
// Add the fullscreen window to the fullscreen window map which is used to
// handle window activations.
HMONITOR monitor = MonitorFromWindow(hwnd(), MONITOR_DEFAULTTOPRIMARY);
if (fullscreen) {
(fullscreen_monitor_map_.Get())[monitor] = this;
} else {
FullscreenWindowMonitorMap::iterator iter =
fullscreen_monitor_map_.Get().find(monitor);
if (iter != fullscreen_monitor_map_.Get().end())
fullscreen_monitor_map_.Get().erase(iter);
}
}
void HWNDMessageHandler::SizeConstraintsChanged() {
LONG style = GetWindowLong(hwnd(), GWL_STYLE);
// Ignore if this is not a standard window.
if (style & (WS_POPUP | WS_CHILD))
return;
LONG exstyle = GetWindowLong(hwnd(), GWL_EXSTYLE);
// Windows cannot have WS_THICKFRAME set if WS_EX_COMPOSITED is set.
// See CalculateWindowStylesFromInitParams().
if (delegate_->CanResize() && (exstyle & WS_EX_COMPOSITED) == 0) {
style |= WS_THICKFRAME | WS_MAXIMIZEBOX;
if (!delegate_->CanMaximize())
style &= ~WS_MAXIMIZEBOX;
} else {
style &= ~(WS_THICKFRAME | WS_MAXIMIZEBOX);
}
if (delegate_->CanMinimize()) {
style |= WS_MINIMIZEBOX;
} else {
style &= ~WS_MINIMIZEBOX;
}
SetWindowLong(hwnd(), GWL_STYLE, style);
}
bool HWNDMessageHandler::HasChildRenderingWindow() {
// This can change dynamically if the system switches between GPU and
// software rendering.
return gfx::RenderingWindowManager::GetInstance()->HasValidChildWindow(
hwnd());
}
////////////////////////////////////////////////////////////////////////////////
// HWNDMessageHandler, gfx::WindowImpl overrides:
HICON HWNDMessageHandler::GetDefaultWindowIcon() const {
if (use_system_default_icon_)
return nullptr;
return ViewsDelegate::GetInstance()
? ViewsDelegate::GetInstance()->GetDefaultWindowIcon()
: nullptr;
}
HICON HWNDMessageHandler::GetSmallWindowIcon() const {
if (use_system_default_icon_)
return nullptr;
return ViewsDelegate::GetInstance()
? ViewsDelegate::GetInstance()->GetSmallWindowIcon()
: nullptr;
}
LRESULT HWNDMessageHandler::OnWndProc(UINT message,
WPARAM w_param,
LPARAM l_param) {
HWND window = hwnd();
LRESULT result = 0;
if (delegate_ && delegate_->PreHandleMSG(message, w_param, l_param, &result))
return result;
// Otherwise we handle everything else.
// NOTE: We inline ProcessWindowMessage() as 'this' may be destroyed during
// dispatch and ProcessWindowMessage() doesn't deal with that well.
const BOOL old_msg_handled = msg_handled_;
base::WeakPtr<HWNDMessageHandler> ref(weak_factory_.GetWeakPtr());
const BOOL processed =
_ProcessWindowMessage(window, message, w_param, l_param, result, 0);
if (!ref)
return 0;
msg_handled_ = old_msg_handled;
if (!processed) {
result = DefWindowProc(window, message, w_param, l_param);
// DefWindowProc() may have destroyed the window and/or us in a nested
// message loop.
if (!ref || !::IsWindow(window))
return result;
}
if (delegate_) {
delegate_->PostHandleMSG(message, w_param, l_param);
if (message == WM_NCDESTROY) {
RestoreEnabledIfNecessary();
delegate_->HandleDestroyed();
}
}
if (message == WM_ACTIVATE && IsTopLevelWindow(window))
PostProcessActivateMessage(LOWORD(w_param), !!HIWORD(w_param),
reinterpret_cast<HWND>(l_param));
return result;
}
LRESULT HWNDMessageHandler::HandleMouseMessage(unsigned int message,
WPARAM w_param,
LPARAM l_param,
bool* handled) {
// Don't track forwarded mouse messages. We expect the caller to track the
// mouse.
base::WeakPtr<HWNDMessageHandler> ref(weak_factory_.GetWeakPtr());
LRESULT ret = HandleMouseEventInternal(message, w_param, l_param, false);
*handled = IsMsgHandled();
return ret;
}
LRESULT HWNDMessageHandler::HandleKeyboardMessage(unsigned int message,
WPARAM w_param,
LPARAM l_param,
bool* handled) {
base::WeakPtr<HWNDMessageHandler> ref(weak_factory_.GetWeakPtr());
LRESULT ret = 0;
if ((message == WM_CHAR) || (message == WM_SYSCHAR))
ret = OnImeMessages(message, w_param, l_param);
else
ret = OnKeyEvent(message, w_param, l_param);
*handled = IsMsgHandled();
return ret;
}
LRESULT HWNDMessageHandler::HandleTouchMessage(unsigned int message,
WPARAM w_param,
LPARAM l_param,
bool* handled) {
base::WeakPtr<HWNDMessageHandler> ref(weak_factory_.GetWeakPtr());
LRESULT ret = OnTouchEvent(message, w_param, l_param);
*handled = IsMsgHandled();
return ret;
}
LRESULT HWNDMessageHandler::HandleScrollMessage(unsigned int message,
WPARAM w_param,
LPARAM l_param,
bool* handled) {
base::WeakPtr<HWNDMessageHandler> ref(weak_factory_.GetWeakPtr());
LRESULT ret = OnScrollMessage(message, w_param, l_param);
*handled = IsMsgHandled();
return ret;
}
LRESULT HWNDMessageHandler::HandleNcHitTestMessage(unsigned int message,
WPARAM w_param,
LPARAM l_param,
bool* handled) {
base::WeakPtr<HWNDMessageHandler> ref(weak_factory_.GetWeakPtr());
LRESULT ret = OnNCHitTest(
gfx::Point(CR_GET_X_LPARAM(l_param), CR_GET_Y_LPARAM(l_param)));
*handled = IsMsgHandled();
return ret;
}
void HWNDMessageHandler::HandleParentChanged() {
// If the forwarder window's parent is changed then we need to reset our
// context as we will not receive touch releases if the touch was initiated
// in the forwarder window.
touch_ids_.clear();
}
////////////////////////////////////////////////////////////////////////////////
// HWNDMessageHandler, private:
int HWNDMessageHandler::GetAppbarAutohideEdges(HMONITOR monitor) {
autohide_factory_.InvalidateWeakPtrs();
return ViewsDelegate::GetInstance()
? ViewsDelegate::GetInstance()->GetAppbarAutohideEdges(
monitor,
base::Bind(&HWNDMessageHandler::OnAppbarAutohideEdgesChanged,
autohide_factory_.GetWeakPtr()))
: ViewsDelegate::EDGE_BOTTOM;
}
void HWNDMessageHandler::OnAppbarAutohideEdgesChanged() {
// This triggers querying WM_NCCALCSIZE again.
RECT client;
GetWindowRect(hwnd(), &client);
SetWindowPos(hwnd(), NULL, client.left, client.top,
client.right - client.left, client.bottom - client.top,
SWP_FRAMECHANGED);
}
void HWNDMessageHandler::SetInitialFocus() {
if (!(GetWindowLong(hwnd(), GWL_EXSTYLE) & WS_EX_TRANSPARENT) &&
!(GetWindowLong(hwnd(), GWL_EXSTYLE) & WS_EX_NOACTIVATE)) {
// The window does not get keyboard messages unless we focus it.
SetFocus(hwnd());
}
}
void HWNDMessageHandler::PostProcessActivateMessage(
int activation_state,
bool minimized,
HWND window_gaining_or_losing_activation) {
DCHECK(IsTopLevelWindow(hwnd()));
const bool active = activation_state != WA_INACTIVE && !minimized;
if (delegate_->CanActivate())
delegate_->HandleActivationChanged(active);
if (!::IsWindow(window_gaining_or_losing_activation))
window_gaining_or_losing_activation = ::GetForegroundWindow();
// If the window losing activation is a fullscreen window, we reduce the size
// of the window by 1px. i.e. Not fullscreen. This is to work around an
// apparent bug in the Windows taskbar where in it tracks fullscreen state on
// a per thread basis. This causes it not be a topmost window when any
// maximized window on a thread which has a fullscreen window is active. This
// affects the way these windows interact with the taskbar, they obscure it
// when maximized, autohide does not work correctly, etc.
// By reducing the size of the fullscreen window by 1px, we ensure that the
// taskbar no longer treats the window and in turn the thread as a fullscreen
// thread. This in turn ensures that maximized windows on the same thread
// don't obscure the taskbar, etc.
// Please note that this taskbar behavior only occurs if the window becoming
// active is on the same monitor as the fullscreen window.
if (!active) {
if (IsFullscreen() && ::IsWindow(window_gaining_or_losing_activation)) {
HMONITOR active_window_monitor = MonitorFromWindow(
window_gaining_or_losing_activation, MONITOR_DEFAULTTOPRIMARY);
HMONITOR fullscreen_window_monitor =
MonitorFromWindow(hwnd(), MONITOR_DEFAULTTOPRIMARY);
if (active_window_monitor == fullscreen_window_monitor)
OnBackgroundFullscreen();
}
} else if (background_fullscreen_hack_) {
// Restore the bounds of the window to fullscreen.
DCHECK(IsFullscreen());
MONITORINFO monitor_info = {sizeof(monitor_info)};
GetMonitorInfo(MonitorFromWindow(hwnd(), MONITOR_DEFAULTTOPRIMARY),
&monitor_info);
SetBoundsInternal(gfx::Rect(monitor_info.rcMonitor), false);
background_fullscreen_hack_ = false;
} else {
// If the window becoming active has a fullscreen window on the same
// monitor then we need to reduce the size of the fullscreen window by
// 1 px. Please refer to the comments above for the reasoning behind
// this.
CheckAndHandleBackgroundFullscreenOnMonitor(
window_gaining_or_losing_activation);
}
}
void HWNDMessageHandler::RestoreEnabledIfNecessary() {
if (delegate_->IsModal() && !restored_enabled_) {
restored_enabled_ = true;
// If we were run modally, we need to undo the disabled-ness we inflicted on
// the owner's parent hierarchy.
HWND start = ::GetWindow(hwnd(), GW_OWNER);
while (start) {
::EnableWindow(start, TRUE);
start = ::GetParent(start);
}
}
}
void HWNDMessageHandler::ExecuteSystemMenuCommand(int command) {
if (command)
SendMessage(hwnd(), WM_SYSCOMMAND, command, 0);
}
void HWNDMessageHandler::TrackMouseEvents(DWORD mouse_tracking_flags) {
// Begin tracking mouse events for this HWND so that we get WM_MOUSELEAVE
// when the user moves the mouse outside this HWND's bounds.
if (active_mouse_tracking_flags_ == 0 || mouse_tracking_flags & TME_CANCEL) {
if (mouse_tracking_flags & TME_CANCEL) {
// We're about to cancel active mouse tracking, so empty out the stored
// state.
active_mouse_tracking_flags_ = 0;
} else {
active_mouse_tracking_flags_ = mouse_tracking_flags;
}
TRACKMOUSEEVENT tme;
tme.cbSize = sizeof(tme);
tme.dwFlags = mouse_tracking_flags;
tme.hwndTrack = hwnd();
tme.dwHoverTime = 0;
TrackMouseEvent(&tme);
} else if (mouse_tracking_flags != active_mouse_tracking_flags_) {
TrackMouseEvents(active_mouse_tracking_flags_ | TME_CANCEL);
TrackMouseEvents(mouse_tracking_flags);
}
}
void HWNDMessageHandler::ClientAreaSizeChanged() {
// Ignore size changes due to fullscreen windows losing activation.
if (background_fullscreen_hack_ && !sent_window_size_changing_)
return;
gfx::Size s = GetClientAreaBounds().size();
delegate_->HandleClientSizeChanged(s);
current_window_size_message_++;
sent_window_size_changing_ = false;
}
bool HWNDMessageHandler::GetClientAreaInsets(gfx::Insets* insets) const {
if (delegate_->GetClientAreaInsets(insets))
return true;
DCHECK(insets->IsEmpty());
// Returning false causes the default handling in OnNCCalcSize() to
// be invoked.
if (!delegate_->HasNonClientView() || HasSystemFrame())
return false;
if (IsMaximized()) {
// Windows automatically adds a standard width border to all sides when a
// window is maximized.
int border_thickness = GetSystemMetrics(SM_CXSIZEFRAME);
if (!delegate_->HasFrame())
border_thickness -= 1;
*insets = gfx::Insets(
border_thickness, border_thickness, border_thickness, border_thickness);
return true;
}
*insets = gfx::Insets();
return true;
}
void HWNDMessageHandler::ResetWindowRegion(bool force, bool redraw) {
// A native frame uses the native window region, and we don't want to mess
// with it.
// WS_EX_COMPOSITED is used instead of WS_EX_LAYERED under aura. WS_EX_LAYERED
// automatically makes clicks on transparent pixels fall through, that isn't
// the case with WS_EX_COMPOSITED. So, we route WS_EX_COMPOSITED through to
// the delegate to allow for a custom hit mask.
if ((window_ex_style() & WS_EX_COMPOSITED) == 0 &&
!custom_window_region_.is_valid() &&
(delegate_->GetFrameMode() == FrameMode::SYSTEM_DRAWN ||
!delegate_->HasNonClientView())) {
if (force)
SetWindowRgn(hwnd(), NULL, redraw);
return;
}
// Changing the window region is going to force a paint. Only change the
// window region if the region really differs.
base::win::ScopedRegion current_rgn(CreateRectRgn(0, 0, 0, 0));
GetWindowRgn(hwnd(), current_rgn.get());
RECT window_rect;
GetWindowRect(hwnd(), &window_rect);
base::win::ScopedRegion new_region;
if (custom_window_region_.is_valid()) {
new_region.reset(CreateRectRgn(0, 0, 0, 0));
CombineRgn(new_region.get(), custom_window_region_.get(), NULL, RGN_COPY);
} else if (IsMaximized()) {
HMONITOR monitor = MonitorFromWindow(hwnd(), MONITOR_DEFAULTTONEAREST);
MONITORINFO mi;
mi.cbSize = sizeof mi;
GetMonitorInfo(monitor, &mi);
RECT work_rect = mi.rcWork;
OffsetRect(&work_rect, -window_rect.left, -window_rect.top);
new_region.reset(CreateRectRgnIndirect(&work_rect));
} else {
gfx::Path window_mask;
delegate_->GetWindowMask(gfx::Size(window_rect.right - window_rect.left,
window_rect.bottom - window_rect.top),
&window_mask);
if (!window_mask.isEmpty())
new_region.reset(gfx::CreateHRGNFromSkPath(window_mask));
}
const bool has_current_region = current_rgn != 0;
const bool has_new_region = new_region != 0;
if (has_current_region != has_new_region ||
(has_current_region && !EqualRgn(current_rgn.get(), new_region.get()))) {
// SetWindowRgn takes ownership of the HRGN.
SetWindowRgn(hwnd(), new_region.release(), redraw);
}
}
void HWNDMessageHandler::UpdateDwmNcRenderingPolicy() {
if (IsFullscreen())
return;
DWMNCRENDERINGPOLICY policy =
custom_window_region_.is_valid() ||
delegate_->GetFrameMode() == FrameMode::CUSTOM_DRAWN
? DWMNCRP_DISABLED
: DWMNCRP_ENABLED;
DwmSetWindowAttribute(hwnd(), DWMWA_NCRENDERING_POLICY,
&policy, sizeof(DWMNCRENDERINGPOLICY));
}
LRESULT HWNDMessageHandler::DefWindowProcWithRedrawLock(UINT message,
WPARAM w_param,
LPARAM l_param) {
ScopedRedrawLock lock(this);
// The Widget and HWND can be destroyed in the call to DefWindowProc, so use
// the WeakPtrFactory to avoid unlocking (and crashing) after destruction.
base::WeakPtr<HWNDMessageHandler> ref(weak_factory_.GetWeakPtr());
LRESULT result = DefWindowProc(hwnd(), message, w_param, l_param);
if (!ref)
lock.CancelUnlockOperation();
return result;
}
void HWNDMessageHandler::LockUpdates(bool force) {
// We skip locked updates when Aero is on for two reasons:
// 1. Because it isn't necessary
// 2. Because toggling the WS_VISIBLE flag may occur while the GPU process is
// attempting to present a child window's backbuffer onscreen. When these
// two actions race with one another, the child window will either flicker
// or will simply stop updating entirely.
if ((force || !ui::win::IsAeroGlassEnabled()) && ++lock_updates_count_ == 1) {
SetWindowLong(hwnd(), GWL_STYLE,
GetWindowLong(hwnd(), GWL_STYLE) & ~WS_VISIBLE);
}
}
void HWNDMessageHandler::UnlockUpdates(bool force) {
if ((force || !ui::win::IsAeroGlassEnabled()) && --lock_updates_count_ <= 0) {
SetWindowLong(hwnd(), GWL_STYLE,
GetWindowLong(hwnd(), GWL_STYLE) | WS_VISIBLE);
lock_updates_count_ = 0;
}
}
void HWNDMessageHandler::ForceRedrawWindow(int attempts) {
if (ui::IsWorkstationLocked()) {
// Presents will continue to fail as long as the input desktop is
// unavailable.
if (--attempts <= 0)
return;
base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
FROM_HERE, base::Bind(&HWNDMessageHandler::ForceRedrawWindow,
weak_factory_.GetWeakPtr(), attempts),
base::TimeDelta::FromMilliseconds(500));
return;
}
InvalidateRect(hwnd(), NULL, FALSE);
}
bool HWNDMessageHandler::HasSystemFrame() const {
return delegate_->HasFrame() &&
delegate_->GetFrameMode() == FrameMode::SYSTEM_DRAWN;
}
// Message handlers ------------------------------------------------------------
void HWNDMessageHandler::OnActivateApp(BOOL active, DWORD thread_id) {
if (delegate_->HasNonClientView() && !active &&
thread_id != GetCurrentThreadId()) {
delegate_->HandleAppDeactivated();
// Also update the native frame if it is rendering the non-client area.
if (HasSystemFrame())
DefWindowProcWithRedrawLock(WM_NCACTIVATE, FALSE, 0);
}
}
BOOL HWNDMessageHandler::OnAppCommand(HWND window,
short command,
WORD device,
int keystate) {
BOOL handled = !!delegate_->HandleAppCommand(command);
SetMsgHandled(handled);
// Make sure to return TRUE if the event was handled or in some cases the
// system will execute the default handler which can cause bugs like going
// forward or back two pages instead of one.
return handled;
}
void HWNDMessageHandler::OnCancelMode() {
delegate_->HandleCancelMode();
// Need default handling, otherwise capture and other things aren't canceled.
SetMsgHandled(FALSE);
}
void HWNDMessageHandler::OnCaptureChanged(HWND window) {
delegate_->HandleCaptureLost();
}
void HWNDMessageHandler::OnClose() {
delegate_->HandleClose();
}
void HWNDMessageHandler::OnCommand(UINT notification_code,
int command,
HWND window) {
// If the notification code is > 1 it means it is control specific and we
// should ignore it.
if (notification_code > 1 || delegate_->HandleAppCommand(command))
SetMsgHandled(FALSE);
}
LRESULT HWNDMessageHandler::OnCreate(CREATESTRUCT* create_struct) {
if (window_ex_style() & WS_EX_COMPOSITED) {
// This is part of the magic to emulate layered windows with Aura
// see the explanation elsewere when we set WS_EX_COMPOSITED style.
MARGINS margins = {-1, -1, -1, -1};
DwmExtendFrameIntoClientArea(hwnd(), &margins);
}
fullscreen_handler_->set_hwnd(hwnd());
// This message initializes the window so that focus border are shown for
// windows.
SendMessage(hwnd(),
WM_CHANGEUISTATE,
MAKELPARAM(UIS_CLEAR, UISF_HIDEFOCUS),
0);
if (!delegate_->HasFrame()) {
SetWindowLong(hwnd(), GWL_STYLE,
GetWindowLong(hwnd(), GWL_STYLE) & ~WS_CAPTION);
SendFrameChanged();
}
// Get access to a modifiable copy of the system menu.
GetSystemMenu(hwnd(), false);
if (ui::AreTouchEventsEnabled())
RegisterTouchWindow(hwnd(), TWF_WANTPALM);
// We need to allow the delegate to size its contents since the window may not
// receive a size notification when its initial bounds are specified at window
// creation time.
ClientAreaSizeChanged();
delegate_->HandleCreate();
windows_session_change_observer_.reset(new WindowsSessionChangeObserver(
base::Bind(&HWNDMessageHandler::OnSessionChange,
base::Unretained(this))));
float scale_factor = display::win::ScreenWin::GetScaleFactorForHWND(hwnd());
dpi_ = display::win::GetDPIFromScalingFactor(scale_factor);
// TODO(beng): move more of NWW::OnCreate here.
return 0;
}
void HWNDMessageHandler::OnDestroy() {
windows_session_change_observer_.reset(nullptr);
delegate_->HandleDestroying();
// If the window going away is a fullscreen window then remove its references
// from the full screen window map.
for (auto iter = fullscreen_monitor_map_.Get().begin();
iter != fullscreen_monitor_map_.Get().end();
iter++) {
if (iter->second == this) {
fullscreen_monitor_map_.Get().erase(iter);
break;
}
}
}
void HWNDMessageHandler::OnDisplayChange(UINT bits_per_pixel,
const gfx::Size& screen_size) {
delegate_->HandleDisplayChange();
// Force a WM_NCCALCSIZE to occur to ensure that we handle auto hide
// taskbars correctly.
SendFrameChanged();
}
LRESULT HWNDMessageHandler::OnDwmCompositionChanged(UINT msg,
WPARAM w_param,
LPARAM l_param) {
if (!delegate_->HasNonClientView()) {
SetMsgHandled(FALSE);
return 0;
}
FrameTypeChanged();
return 0;
}
LRESULT HWNDMessageHandler::OnDpiChanged(UINT msg,
WPARAM w_param,
LPARAM l_param) {
if (LOWORD(w_param) != HIWORD(w_param))
NOTIMPLEMENTED() << "Received non-square scaling factors";
// The first WM_DPICHANGED originates from EnableChildWindowDpiMessage during
// initialization. We don't want to propagate this as the client is already
// set at the current scale factor and may cause the window to display too
// soon. See http://crbug.com/625076.
int dpi = LOWORD(w_param);
if (dpi_ == dpi)
return 0;
dpi_ = dpi;
SetBoundsInternal(gfx::Rect(*reinterpret_cast<RECT*>(l_param)), false);
delegate_->HandleWindowScaleFactorChanged(
display::win::GetScalingFactorFromDPI(dpi_));
return 0;
}
void HWNDMessageHandler::OnEnterMenuLoop(BOOL from_track_popup_menu) {
if (menu_depth_++ == 0)
delegate_->HandleMenuLoop(true);
}
void HWNDMessageHandler::OnEnterSizeMove() {
delegate_->HandleBeginWMSizeMove();
SetMsgHandled(FALSE);
}
LRESULT HWNDMessageHandler::OnEraseBkgnd(HDC dc) {
// Needed to prevent resize flicker.
return 1;
}
void HWNDMessageHandler::OnExitMenuLoop(BOOL is_shortcut_menu) {
if (--menu_depth_ == 0)
delegate_->HandleMenuLoop(false);
DCHECK_GE(0, menu_depth_);
}
void HWNDMessageHandler::OnExitSizeMove() {
delegate_->HandleEndWMSizeMove();
SetMsgHandled(FALSE);
// If the window was moved to a monitor which has a fullscreen window active,
// we need to reduce the size of the fullscreen window by 1px.
CheckAndHandleBackgroundFullscreenOnMonitor(hwnd());
}
void HWNDMessageHandler::OnGetMinMaxInfo(MINMAXINFO* minmax_info) {
gfx::Size min_window_size;
gfx::Size max_window_size;
delegate_->GetMinMaxSize(&min_window_size, &max_window_size);
min_window_size = delegate_->DIPToScreenSize(min_window_size);
max_window_size = delegate_->DIPToScreenSize(max_window_size);
// Add the native frame border size to the minimum and maximum size if the
// view reports its size as the client size.
if (delegate_->WidgetSizeIsClientSize()) {
RECT client_rect, window_rect;
GetClientRect(hwnd(), &client_rect);
GetWindowRect(hwnd(), &window_rect);
CR_DEFLATE_RECT(&window_rect, &client_rect);
min_window_size.Enlarge(window_rect.right - window_rect.left,
window_rect.bottom - window_rect.top);
// Either axis may be zero, so enlarge them independently.
if (max_window_size.width())
max_window_size.Enlarge(window_rect.right - window_rect.left, 0);
if (max_window_size.height())
max_window_size.Enlarge(0, window_rect.bottom - window_rect.top);
}
minmax_info->ptMinTrackSize.x = min_window_size.width();
minmax_info->ptMinTrackSize.y = min_window_size.height();
if (max_window_size.width() || max_window_size.height()) {
if (!max_window_size.width())
max_window_size.set_width(GetSystemMetrics(SM_CXMAXTRACK));
if (!max_window_size.height())
max_window_size.set_height(GetSystemMetrics(SM_CYMAXTRACK));
minmax_info->ptMaxTrackSize.x = max_window_size.width();
minmax_info->ptMaxTrackSize.y = max_window_size.height();
}
SetMsgHandled(FALSE);
}
LRESULT HWNDMessageHandler::OnGetObject(UINT message,
WPARAM w_param,
LPARAM l_param) {
LRESULT reference_result = static_cast<LRESULT>(0L);
// Only the lower 32 bits of l_param are valid when checking the object id
// because it sometimes gets sign-extended incorrectly (but not always).
DWORD obj_id = static_cast<DWORD>(static_cast<DWORD_PTR>(l_param));
// Accessibility readers will send an OBJID_CLIENT message
if (static_cast<DWORD>(OBJID_CLIENT) == obj_id) {
// Retrieve MSAA dispatch object for the root view.
base::win::ScopedComPtr<IAccessible> root(
delegate_->GetNativeViewAccessible());
// Create a reference that MSAA will marshall to the client.
reference_result = LresultFromObject(IID_IAccessible, w_param,
static_cast<IAccessible*>(root.Detach()));
}
return reference_result;
}
LRESULT HWNDMessageHandler::OnImeMessages(UINT message,
WPARAM w_param,
LPARAM l_param) {
LRESULT result = 0;
base::WeakPtr<HWNDMessageHandler> ref(weak_factory_.GetWeakPtr());
const bool msg_handled =
delegate_->HandleIMEMessage(message, w_param, l_param, &result);
if (ref.get())
SetMsgHandled(msg_handled);
return result;
}
void HWNDMessageHandler::OnInitMenu(HMENU menu) {
bool is_fullscreen = IsFullscreen();
bool is_minimized = IsMinimized();
bool is_maximized = IsMaximized();
bool is_restored = !is_fullscreen && !is_minimized && !is_maximized;
ScopedRedrawLock lock(this);
EnableMenuItemByCommand(menu, SC_RESTORE, delegate_->CanResize() &&
(is_minimized || is_maximized));
EnableMenuItemByCommand(menu, SC_MOVE, is_restored);
EnableMenuItemByCommand(menu, SC_SIZE, delegate_->CanResize() && is_restored);
EnableMenuItemByCommand(menu, SC_MAXIMIZE, delegate_->CanMaximize() &&
!is_fullscreen && !is_maximized);
EnableMenuItemByCommand(menu, SC_MINIMIZE, delegate_->CanMinimize() &&
!is_minimized);
if (is_maximized && delegate_->CanResize())
::SetMenuDefaultItem(menu, SC_RESTORE, FALSE);
else if (!is_maximized && delegate_->CanMaximize())
::SetMenuDefaultItem(menu, SC_MAXIMIZE, FALSE);
}
void HWNDMessageHandler::OnInputLangChange(DWORD character_set,
HKL input_language_id) {
delegate_->HandleInputLanguageChange(character_set, input_language_id);
}
LRESULT HWNDMessageHandler::OnKeyEvent(UINT message,
WPARAM w_param,
LPARAM l_param) {
MSG msg = {
hwnd(), message, w_param, l_param, static_cast<DWORD>(GetMessageTime())};
ui::KeyEvent key(msg);
base::WeakPtr<HWNDMessageHandler> ref(weak_factory_.GetWeakPtr());
delegate_->HandleKeyEvent(&key);
if (!ref)
return 0;
if (!key.handled())
SetMsgHandled(FALSE);
return 0;
}
void HWNDMessageHandler::OnKillFocus(HWND focused_window) {
delegate_->HandleNativeBlur(focused_window);
SetMsgHandled(FALSE);
}
LRESULT HWNDMessageHandler::OnMouseActivate(UINT message,
WPARAM w_param,
LPARAM l_param) {
// Please refer to the comments in the header for the touch_down_contexts_
// member for the if statement below.
if (touch_down_contexts_)
return MA_NOACTIVATE;
// On Windows, if we select the menu item by touch and if the window at the
// location is another window on the same thread, that window gets a
// WM_MOUSEACTIVATE message and ends up activating itself, which is not
// correct. We workaround this by setting a property on the window at the
// current cursor location. We check for this property in our
// WM_MOUSEACTIVATE handler and don't activate the window if the property is
// set.
if (::GetProp(hwnd(), ui::kIgnoreTouchMouseActivateForWindow)) {
::RemoveProp(hwnd(), ui::kIgnoreTouchMouseActivateForWindow);
return MA_NOACTIVATE;
}
// TODO(beng): resolve this with the GetWindowLong() check on the subsequent
// line.
if (delegate_->HasNonClientView()) {
if (delegate_->CanActivate())
return MA_ACTIVATE;
if (delegate_->WantsMouseEventsWhenInactive())
return MA_NOACTIVATE;
return MA_NOACTIVATEANDEAT;
}
if (GetWindowLong(hwnd(), GWL_EXSTYLE) & WS_EX_NOACTIVATE)
return MA_NOACTIVATE;
SetMsgHandled(FALSE);
return MA_ACTIVATE;
}
LRESULT HWNDMessageHandler::OnMouseRange(UINT message,
WPARAM w_param,
LPARAM l_param) {
return HandleMouseEventInternal(message, w_param, l_param, true);
}
// On some systems with a high-resolution track pad and running Windows 10,
// using the scrolling gesture (two-finger scroll) on the track pad
// causes it to also generate a WM_POINTERDOWN message if the window
// isn't focused. This leads to a WM_POINTERACTIVATE message and the window
// gaining focus and coming to the front. This code detects a
// WM_POINTERACTIVATE coming from the track pad and kills the activation
// of the window. NOTE: most other trackpad messages come in as mouse
// messages, including WM_MOUSEWHEEL instead of WM_POINTERWHEEL.
LRESULT HWNDMessageHandler::OnPointerActivate(UINT message,
WPARAM w_param,
LPARAM l_param) {
using GetPointerTypeFn = BOOL(WINAPI*)(UINT32, POINTER_INPUT_TYPE*);
UINT32 pointer_id = GET_POINTERID_WPARAM(w_param);
POINTER_INPUT_TYPE pointer_type;
static GetPointerTypeFn get_pointer_type = reinterpret_cast<GetPointerTypeFn>(
GetProcAddress(GetModuleHandleA("user32.dll"), "GetPointerType"));
if (get_pointer_type && get_pointer_type(pointer_id, &pointer_type) &&
pointer_type == PT_TOUCHPAD)
return PA_NOACTIVATE;
SetMsgHandled(FALSE);
return -1;
}
void HWNDMessageHandler::OnMove(const gfx::Point& point) {
delegate_->HandleMove();
SetMsgHandled(FALSE);
}
void HWNDMessageHandler::OnMoving(UINT param, const RECT* new_bounds) {
delegate_->HandleMove();
}
LRESULT HWNDMessageHandler::OnNCActivate(UINT message,
WPARAM w_param,
LPARAM l_param) {
// Per MSDN, w_param is either TRUE or FALSE. However, MSDN also hints that:
// "If the window is minimized when this message is received, the application
// should pass the message to the DefWindowProc function."
// It is found out that the high word of w_param might be set when the window
// is minimized or restored. To handle this, w_param's high word should be
// cleared before it is converted to BOOL.
BOOL active = static_cast<BOOL>(LOWORD(w_param));
bool render_as_active = delegate_->IsAlwaysRenderAsActive();
if (!delegate_->HasNonClientView()) {
SetMsgHandled(FALSE);
return 0;
}
if (!delegate_->CanActivate())
return TRUE;
// On activation, lift any prior restriction against rendering as inactive.
if (active && render_as_active)
delegate_->SetAlwaysRenderAsActive(false);
if (delegate_->GetFrameMode() == FrameMode::CUSTOM_DRAWN) {
// TODO(beng, et al): Hack to redraw this window and child windows
// synchronously upon activation. Not all child windows are redrawing
// themselves leading to issues like http://crbug.com/74604
// We redraw out-of-process HWNDs asynchronously to avoid hanging the
// whole app if a child HWND belonging to a hung plugin is encountered.
RedrawWindow(hwnd(), NULL, NULL,
RDW_NOCHILDREN | RDW_INVALIDATE | RDW_UPDATENOW);
EnumChildWindows(hwnd(), EnumChildWindowsForRedraw, NULL);
}
// The frame may need to redraw as a result of the activation change.
// We can get WM_NCACTIVATE before we're actually visible. If we're not
// visible, no need to paint.
if (IsVisible())
delegate_->SchedulePaint();
if (delegate_->GetFrameMode() == FrameMode::CUSTOM_DRAWN) {
SetMsgHandled(TRUE);
return TRUE;
}
return DefWindowProcWithRedrawLock(
WM_NCACTIVATE, render_as_active || active, 0);
}
LRESULT HWNDMessageHandler::OnNCCalcSize(BOOL mode, LPARAM l_param) {
// We only override the default handling if we need to specify a custom
// non-client edge width. Note that in most cases "no insets" means no
// custom width, but in fullscreen mode or when the NonClientFrameView
// requests it, we want a custom width of 0.
// Let User32 handle the first nccalcsize for captioned windows
// so it updates its internal structures (specifically caption-present)
// Without this Tile & Cascade windows won't work.
// See http://code.google.com/p/chromium/issues/detail?id=900
if (is_first_nccalc_) {
is_first_nccalc_ = false;
if (GetWindowLong(hwnd(), GWL_STYLE) & WS_CAPTION) {
SetMsgHandled(FALSE);
return 0;
}
}
gfx::Insets insets;
bool got_insets = GetClientAreaInsets(&insets);
if (!got_insets && !IsFullscreen() && !(mode && !delegate_->HasFrame())) {
SetMsgHandled(FALSE);
return 0;
}
RECT* client_rect = mode ?
&(reinterpret_cast<NCCALCSIZE_PARAMS*>(l_param)->rgrc[0]) :
reinterpret_cast<RECT*>(l_param);
client_rect->left += insets.left();
client_rect->top += insets.top();
client_rect->bottom -= insets.bottom();
client_rect->right -= insets.right();
if (IsMaximized()) {
// Find all auto-hide taskbars along the screen edges and adjust in by the
// thickness of the auto-hide taskbar on each such edge, so the window isn't
// treated as a "fullscreen app", which would cause the taskbars to
// disappear.
HMONITOR monitor = MonitorFromWindow(hwnd(), MONITOR_DEFAULTTONULL);
if (!monitor) {
// We might end up here if the window was previously minimized and the
// user clicks on the taskbar button to restore it in the previously
// maximized position. In that case WM_NCCALCSIZE is sent before the
// window coordinates are restored to their previous values, so our
// (left,top) would probably be (-32000,-32000) like all minimized
// windows. So the above MonitorFromWindow call fails, but if we check
// the window rect given with WM_NCCALCSIZE (which is our previous
// restored window position) we will get the correct monitor handle.
monitor = MonitorFromRect(client_rect, MONITOR_DEFAULTTONULL);
if (!monitor) {
// This is probably an extreme case that we won't hit, but if we don't
// intersect any monitor, let us not adjust the client rect since our
// window will not be visible anyway.
return 0;
}
}
const int autohide_edges = GetAppbarAutohideEdges(monitor);
if (autohide_edges & ViewsDelegate::EDGE_LEFT)
client_rect->left += kAutoHideTaskbarThicknessPx;
if (autohide_edges & ViewsDelegate::EDGE_TOP) {
if (delegate_->GetFrameMode() == FrameMode::SYSTEM_DRAWN) {
// Tricky bit. Due to a bug in DwmDefWindowProc()'s handling of
// WM_NCHITTEST, having any nonclient area atop the window causes the
// caption buttons to draw onscreen but not respond to mouse
// hover/clicks.
// So for a taskbar at the screen top, we can't push the
// client_rect->top down; instead, we move the bottom up by one pixel,
// which is the smallest change we can make and still get a client area
// less than the screen size. This is visibly ugly, but there seems to
// be no better solution.
--client_rect->bottom;
} else {
client_rect->top += kAutoHideTaskbarThicknessPx;
}
}
if (autohide_edges & ViewsDelegate::EDGE_RIGHT)
client_rect->right -= kAutoHideTaskbarThicknessPx;
if (autohide_edges & ViewsDelegate::EDGE_BOTTOM)
client_rect->bottom -= kAutoHideTaskbarThicknessPx;
// We cannot return WVR_REDRAW when there is nonclient area, or Windows
// exhibits bugs where client pixels and child HWNDs are mispositioned by
// the width/height of the upper-left nonclient area.
return 0;
}
// If the window bounds change, we're going to relayout and repaint anyway.
// Returning WVR_REDRAW avoids an extra paint before that of the old client
// pixels in the (now wrong) location, and thus makes actions like resizing a
// window from the left edge look slightly less broken.
// We special case when left or top insets are 0, since these conditions
// actually require another repaint to correct the layout after glass gets
// turned on and off.
if (insets.left() == 0 || insets.top() == 0)
return 0;
return mode ? WVR_REDRAW : 0;
}
LRESULT HWNDMessageHandler::OnNCHitTest(const gfx::Point& point) {
if (!delegate_->HasNonClientView()) {
SetMsgHandled(FALSE);
return 0;
}
// Some views may overlap the non client area of the window.
// This means that we should look for these views before handing the
// hittest message off to DWM or DefWindowProc.
// If the hittest returned from the search for a view returns HTCLIENT
// then it means that we have a view overlapping the non client area.
// In all other cases we can fallback to the system default handling.
// Allow the NonClientView to handle the hittest to see if we have a view
// overlapping the non client area of the window.
POINT temp = { point.x(), point.y() };
MapWindowPoints(HWND_DESKTOP, hwnd(), &temp, 1);
int component = delegate_->GetNonClientComponent(gfx::Point(temp));
if (component == HTCLIENT)
return component;
// If the DWM is rendering the window controls, we need to give the DWM's
// default window procedure first chance to handle hit testing.
if (HasSystemFrame()) {
LRESULT result;
if (DwmDefWindowProc(hwnd(), WM_NCHITTEST, 0,
MAKELPARAM(point.x(), point.y()), &result)) {
return result;
}
}
// If the point is specified as custom or system nonclient item, return it.
if (component != HTNOWHERE)
return component;
// Otherwise, we let Windows do all the native frame non-client handling for
// us.
LRESULT hit_test_code = DefWindowProc(hwnd(), WM_NCHITTEST, 0,
MAKELPARAM(point.x(), point.y()));
return hit_test_code;
}
void HWNDMessageHandler::OnNCPaint(HRGN rgn) {
RECT window_rect;
GetWindowRect(hwnd(), &window_rect);
RECT dirty_region;
// A value of 1 indicates paint all.
if (!rgn || rgn == reinterpret_cast<HRGN>(1)) {
dirty_region.left = 0;
dirty_region.top = 0;
dirty_region.right = window_rect.right - window_rect.left;
dirty_region.bottom = window_rect.bottom - window_rect.top;
} else {
RECT rgn_bounding_box;
GetRgnBox(rgn, &rgn_bounding_box);
if (!IntersectRect(&dirty_region, &rgn_bounding_box, &window_rect)) {
SetMsgHandled(FALSE);
return; // Dirty region doesn't intersect window bounds, bail.
}
// rgn_bounding_box is in screen coordinates. Map it to window coordinates.
OffsetRect(&dirty_region, -window_rect.left, -window_rect.top);
}
// We only do non-client painting if we're not using the system frame.
// It's required to avoid some native painting artifacts from appearing when
// the window is resized.
if (!delegate_->HasNonClientView() ||
delegate_->GetFrameMode() == FrameMode::SYSTEM_DRAWN) {
if (ui::win::IsAeroGlassEnabled()) {
// The default WM_NCPAINT handler under Aero Glass doesn't clear the
// nonclient area, so it'll remain the default white color. That area is
// invisible initially (covered by the window border) but can become
// temporarily visible on maximizing or fullscreening, so clear it here.
HDC dc = GetWindowDC(hwnd());
RECT client_rect;
::GetClientRect(hwnd(), &client_rect);
::MapWindowPoints(hwnd(), nullptr, reinterpret_cast<POINT*>(&client_rect),
2);
::OffsetRect(&client_rect, -window_rect.left, -window_rect.top);
// client_rect now is in window space.
base::win::ScopedRegion base(::CreateRectRgnIndirect(&dirty_region));
base::win::ScopedRegion client(::CreateRectRgnIndirect(&client_rect));
base::win::ScopedRegion nonclient(::CreateRectRgn(0, 0, 0, 0));
::CombineRgn(nonclient.get(), base.get(), client.get(), RGN_DIFF);
::SelectClipRgn(dc, nonclient.get());
HBRUSH brush = CreateSolidBrush(0);
::FillRect(dc, &dirty_region, brush);
::DeleteObject(brush);
::ReleaseDC(hwnd(), dc);
}
SetMsgHandled(FALSE);
return;
}
gfx::Size root_view_size = delegate_->GetRootViewSize();
if (gfx::Size(window_rect.right - window_rect.left,
window_rect.bottom - window_rect.top) != root_view_size) {
// If the size of the window differs from the size of the root view it
// means we're being asked to paint before we've gotten a WM_SIZE. This can
// happen when the user is interactively resizing the window. To avoid
// mass flickering we don't do anything here. Once we get the WM_SIZE we'll
// reset the region of the window which triggers another WM_NCPAINT and
// all is well.
return;
}
delegate_->HandlePaintAccelerated(gfx::Rect(dirty_region));
// When using a custom frame, we want to avoid calling DefWindowProc() since
// that may render artifacts.
SetMsgHandled(delegate_->GetFrameMode() == FrameMode::CUSTOM_DRAWN);
}
LRESULT HWNDMessageHandler::OnNCUAHDrawCaption(UINT message,
WPARAM w_param,
LPARAM l_param) {
// See comment in widget_win.h at the definition of WM_NCUAHDRAWCAPTION for
// an explanation about why we need to handle this message.
SetMsgHandled(delegate_->GetFrameMode() == FrameMode::CUSTOM_DRAWN);
return 0;
}
LRESULT HWNDMessageHandler::OnNCUAHDrawFrame(UINT message,
WPARAM w_param,
LPARAM l_param) {
// See comment in widget_win.h at the definition of WM_NCUAHDRAWCAPTION for
// an explanation about why we need to handle this message.
SetMsgHandled(delegate_->GetFrameMode() == FrameMode::CUSTOM_DRAWN);
return 0;
}
LRESULT HWNDMessageHandler::OnNotify(int w_param, NMHDR* l_param) {
LRESULT l_result = 0;
SetMsgHandled(delegate_->HandleTooltipNotify(w_param, l_param, &l_result));
return l_result;
}
void HWNDMessageHandler::OnPaint(HDC dc) {
// Call BeginPaint()/EndPaint() around the paint handling, as that seems
// to do more to actually validate the window's drawing region. This only
// appears to matter for Windows that have the WS_EX_COMPOSITED style set
// but will be valid in general too.
PAINTSTRUCT ps;
HDC display_dc = BeginPaint(hwnd(), &ps);
if (!display_dc) {
// Collect some information as to why this may have happened and preserve
// it on the stack so it shows up in a dump.
// This is temporary data collection code in service of
// http://crbug.com/512945
DWORD last_error = GetLastError();
size_t current_gdi_objects =
GetGuiResources(GetCurrentProcess(), GR_GDIOBJECTS);
size_t peak_gdi_objects = GetGuiResources(
GetCurrentProcess(), GR_GDIOBJECTS_PEAK);
base::debug::Alias(&last_error);
base::debug::Alias(&current_gdi_objects);
base::debug::Alias(&peak_gdi_objects);
LOG(FATAL) << "Failed to create DC in BeginPaint(). GLE = " << last_error
<< ", GDI object count: " << current_gdi_objects
<< ", GDI peak count: " << peak_gdi_objects;
}
if (!IsRectEmpty(&ps.rcPaint)) {
if (HasChildRenderingWindow()) {
// If there's a child window that's being rendered to then clear the
// area outside it (as WS_CLIPCHILDREN is set) with transparent black.
// Otherwise, other portions of the backing store for the window can
// flicker opaque black. http://crbug.com/586454
FillRect(ps.hdc, &ps.rcPaint,
reinterpret_cast<HBRUSH>(GetStockObject(BLACK_BRUSH)));
}
delegate_->HandlePaintAccelerated(gfx::Rect(ps.rcPaint));
}
EndPaint(hwnd(), &ps);
}
LRESULT HWNDMessageHandler::OnReflectedMessage(UINT message,
WPARAM w_param,
LPARAM l_param) {
SetMsgHandled(FALSE);
return 0;
}
LRESULT HWNDMessageHandler::OnScrollMessage(UINT message,
WPARAM w_param,
LPARAM l_param) {
MSG msg = {
hwnd(), message, w_param, l_param, static_cast<DWORD>(GetMessageTime())};
ui::ScrollEvent event(msg);
delegate_->HandleScrollEvent(event);
return 0;
}
LRESULT HWNDMessageHandler::OnSetCursor(UINT message,
WPARAM w_param,
LPARAM l_param) {
// Reimplement the necessary default behavior here. Calling DefWindowProc can
// trigger weird non-client painting for non-glass windows with custom frames.
// Using a ScopedRedrawLock to prevent caption rendering artifacts may allow
// content behind this window to incorrectly paint in front of this window.
// Invalidating the window to paint over either set of artifacts is not ideal.
wchar_t* cursor = IDC_ARROW;
switch (LOWORD(l_param)) {
case HTSIZE:
cursor = IDC_SIZENWSE;
break;
case HTLEFT:
case HTRIGHT:
cursor = IDC_SIZEWE;
break;
case HTTOP:
case HTBOTTOM:
cursor = IDC_SIZENS;
break;
case HTTOPLEFT:
case HTBOTTOMRIGHT:
cursor = IDC_SIZENWSE;
break;
case HTTOPRIGHT:
case HTBOTTOMLEFT:
cursor = IDC_SIZENESW;
break;
case HTCLIENT:
SetCursor(current_cursor_);
return 1;
case LOWORD(HTERROR): // Use HTERROR's LOWORD value for valid comparison.
SetMsgHandled(FALSE);
break;
default:
// Use the default value, IDC_ARROW.
break;
}
::SetCursor(LoadCursor(NULL, cursor));
return 1;
}
void HWNDMessageHandler::OnSetFocus(HWND last_focused_window) {
delegate_->HandleNativeFocus(last_focused_window);
SetMsgHandled(FALSE);
}
LRESULT HWNDMessageHandler::OnSetIcon(UINT size_type, HICON new_icon) {
// Use a ScopedRedrawLock to avoid weird non-client painting.
return DefWindowProcWithRedrawLock(WM_SETICON, size_type,
reinterpret_cast<LPARAM>(new_icon));
}
LRESULT HWNDMessageHandler::OnSetText(const wchar_t* text) {
// Use a ScopedRedrawLock to avoid weird non-client painting.
return DefWindowProcWithRedrawLock(WM_SETTEXT, NULL,
reinterpret_cast<LPARAM>(text));
}
void HWNDMessageHandler::OnSettingChange(UINT flags, const wchar_t* section) {
if (!GetParent(hwnd()) && (flags == SPI_SETWORKAREA) &&
!delegate_->WillProcessWorkAreaChange()) {
// Fire a dummy SetWindowPos() call, so we'll trip the code in
// OnWindowPosChanging() below that notices work area changes.
::SetWindowPos(hwnd(), 0, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE |
SWP_NOZORDER | SWP_NOREDRAW | SWP_NOACTIVATE | SWP_NOOWNERZORDER);
SetMsgHandled(TRUE);
} else {
if (flags == SPI_SETWORKAREA)
delegate_->HandleWorkAreaChanged();
SetMsgHandled(FALSE);
}
// If the work area is changing, then it could be as a result of the taskbar
// broadcasting the WM_SETTINGCHANGE message due to changes in auto hide
// settings, etc. Force a WM_NCCALCSIZE to occur to ensure that we handle
// this correctly.
if (flags == SPI_SETWORKAREA)
SendFrameChanged();
}
void HWNDMessageHandler::OnSize(UINT param, const gfx::Size& size) {
RedrawWindow(hwnd(), NULL, NULL, RDW_INVALIDATE | RDW_ALLCHILDREN);
// ResetWindowRegion is going to trigger WM_NCPAINT. By doing it after we've
// invoked OnSize we ensure the RootView has been laid out.
ResetWindowRegion(false, true);
}
void HWNDMessageHandler::OnSysCommand(UINT notification_code,
const gfx::Point& point) {
if (!delegate_->ShouldHandleSystemCommands())
return;
// Windows uses the 4 lower order bits of |notification_code| for type-
// specific information so we must exclude this when comparing.
static const int sc_mask = 0xFFF0;
// Ignore size/move/maximize in fullscreen mode.
if (IsFullscreen() && (((notification_code & sc_mask) == SC_SIZE) ||
((notification_code & sc_mask) == SC_MOVE) ||
((notification_code & sc_mask) == SC_MAXIMIZE)))
return;
if (delegate_->GetFrameMode() == FrameMode::CUSTOM_DRAWN) {
if ((notification_code & sc_mask) == SC_MINIMIZE ||
(notification_code & sc_mask) == SC_MAXIMIZE ||
(notification_code & sc_mask) == SC_RESTORE) {
delegate_->ResetWindowControls();
} else if ((notification_code & sc_mask) == SC_MOVE ||
(notification_code & sc_mask) == SC_SIZE) {
if (!IsVisible()) {
// Circumvent ScopedRedrawLocks and force visibility before entering a
// resize or move modal loop to get continuous sizing/moving feedback.
SetWindowLong(hwnd(), GWL_STYLE,
GetWindowLong(hwnd(), GWL_STYLE) | WS_VISIBLE);
}
}
}
// Handle SC_KEYMENU, which means that the user has pressed the ALT
// key and released it, so we should focus the menu bar.
if ((notification_code & sc_mask) == SC_KEYMENU && point.x() == 0) {
int modifiers = ui::EF_NONE;
if (ui::win::IsShiftPressed())
modifiers |= ui::EF_SHIFT_DOWN;
if (ui::win::IsCtrlPressed())
modifiers |= ui::EF_CONTROL_DOWN;
// Retrieve the status of shift and control keys to prevent consuming
// shift+alt keys, which are used by Windows to change input languages.
ui::Accelerator accelerator(ui::KeyboardCodeForWindowsKeyCode(VK_MENU),
modifiers);
delegate_->HandleAccelerator(accelerator);
return;
}
// If the delegate can't handle it, the system implementation will be called.
if (!delegate_->HandleCommand(notification_code)) {
// If the window is being resized by dragging the borders of the window
// with the mouse/touch/keyboard, we flag as being in a size loop.
if ((notification_code & sc_mask) == SC_SIZE)
in_size_loop_ = true;
base::WeakPtr<HWNDMessageHandler> ref(weak_factory_.GetWeakPtr());
DefWindowProc(hwnd(), WM_SYSCOMMAND, notification_code,
MAKELPARAM(point.x(), point.y()));
if (!ref.get())
return;
in_size_loop_ = false;
}
}
void HWNDMessageHandler::OnThemeChanged() {
ui::NativeThemeWin::instance()->CloseHandles();
}
LRESULT HWNDMessageHandler::OnTouchEvent(UINT message,
WPARAM w_param,
LPARAM l_param) {
// Handle touch events only on Aura for now.
int num_points = LOWORD(w_param);
std::unique_ptr<TOUCHINPUT[]> input(new TOUCHINPUT[num_points]);
if (ui::GetTouchInputInfoWrapper(reinterpret_cast<HTOUCHINPUT>(l_param),
num_points, input.get(),
sizeof(TOUCHINPUT))) {
// input[i].dwTime doesn't necessarily relate to the system time at all,
// so use base::TimeTicks::Now().
const base::TimeTicks event_time = base::TimeTicks::Now();
TouchEvents touch_events;
for (int i = 0; i < num_points; ++i) {
POINT point;
point.x = TOUCH_COORD_TO_PIXEL(input[i].x);
point.y = TOUCH_COORD_TO_PIXEL(input[i].y);
if (base::win::GetVersion() == base::win::VERSION_WIN7) {
// Windows 7 sends touch events for touches in the non-client area,
// whereas Windows 8 does not. In order to unify the behaviour, always
// ignore touch events in the non-client area.
LPARAM l_param_ht = MAKELPARAM(point.x, point.y);
LRESULT hittest = SendMessage(hwnd(), WM_NCHITTEST, 0, l_param_ht);
if (hittest != HTCLIENT)
return 0;
}
ScreenToClient(hwnd(), &point);
last_touch_message_time_ = ::GetMessageTime();
gfx::Point touch_point(point.x, point.y);
unsigned int touch_id = id_generator_.GetGeneratedID(input[i].dwID);
if (input[i].dwFlags & TOUCHEVENTF_DOWN) {
touch_ids_.insert(input[i].dwID);
GenerateTouchEvent(ui::ET_TOUCH_PRESSED, touch_point, touch_id,
event_time, &touch_events);
touch_down_contexts_++;
base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
FROM_HERE, base::Bind(&HWNDMessageHandler::ResetTouchDownContext,
weak_factory_.GetWeakPtr()),
base::TimeDelta::FromMilliseconds(kTouchDownContextResetTimeout));
} else {
if (input[i].dwFlags & TOUCHEVENTF_MOVE) {
GenerateTouchEvent(ui::ET_TOUCH_MOVED, touch_point, touch_id,
event_time, &touch_events);
}
if (input[i].dwFlags & TOUCHEVENTF_UP) {
touch_ids_.erase(input[i].dwID);
GenerateTouchEvent(ui::ET_TOUCH_RELEASED, touch_point, touch_id,
event_time, &touch_events);
id_generator_.ReleaseNumber(input[i].dwID);
}
}
}
// Handle the touch events asynchronously. We need this because touch
// events on windows don't fire if we enter a modal loop in the context of
// a touch event.
base::ThreadTaskRunnerHandle::Get()->PostTask(
FROM_HERE, base::Bind(&HWNDMessageHandler::HandleTouchEvents,
weak_factory_.GetWeakPtr(), touch_events));
}
CloseTouchInputHandle(reinterpret_cast<HTOUCHINPUT>(l_param));
SetMsgHandled(FALSE);
return 0;
}
void HWNDMessageHandler::OnWindowPosChanging(WINDOWPOS* window_pos) {
if (ignore_window_pos_changes_) {
// If somebody's trying to toggle our visibility, change the nonclient area,
// change our Z-order, or activate us, we should probably let it go through.
if (!(window_pos->flags & ((IsVisible() ? SWP_HIDEWINDOW : SWP_SHOWWINDOW) |
SWP_FRAMECHANGED)) &&
(window_pos->flags & (SWP_NOZORDER | SWP_NOACTIVATE))) {
// Just sizing/moving the window; ignore.
window_pos->flags |= SWP_NOSIZE | SWP_NOMOVE | SWP_NOREDRAW;
window_pos->flags &= ~(SWP_SHOWWINDOW | SWP_HIDEWINDOW);
}
} else if (!GetParent(hwnd())) {
RECT window_rect;
HMONITOR monitor;
gfx::Rect monitor_rect, work_area;
if (GetWindowRect(hwnd(), &window_rect) &&
GetMonitorAndRects(window_rect, &monitor, &monitor_rect, &work_area)) {
bool work_area_changed = (monitor_rect == last_monitor_rect_) &&
(work_area != last_work_area_);
// If the size of a background fullscreen window changes again, then we
// should reset the |background_fullscreen_hack_| flag.
if (background_fullscreen_hack_ &&
(!(window_pos->flags & SWP_NOSIZE) &&
(monitor_rect.height() - window_pos->cy != 1))) {
background_fullscreen_hack_ = false;
}
if (monitor && (monitor == last_monitor_) &&
((IsFullscreen() && !background_fullscreen_hack_) ||
work_area_changed)) {
// A rect for the monitor we're on changed. Normally Windows notifies
// us about this (and thus we're reaching here due to the SetWindowPos()
// call in OnSettingChange() above), but with some software (e.g.
// nVidia's nView desktop manager) the work area can change asynchronous
// to any notification, and we're just sent a SetWindowPos() call with a
// new (frequently incorrect) position/size. In either case, the best
// response is to throw away the existing position/size information in
// |window_pos| and recalculate it based on the new work rect.
gfx::Rect new_window_rect;
if (IsFullscreen()) {
new_window_rect = monitor_rect;
} else if (IsMaximized()) {
new_window_rect = work_area;
int border_thickness = GetSystemMetrics(SM_CXSIZEFRAME);
new_window_rect.Inset(-border_thickness, -border_thickness);
} else {
new_window_rect = gfx::Rect(window_rect);
new_window_rect.AdjustToFit(work_area);
}
window_pos->x = new_window_rect.x();
window_pos->y = new_window_rect.y();
window_pos->cx = new_window_rect.width();
window_pos->cy = new_window_rect.height();
// WARNING! Don't set SWP_FRAMECHANGED here, it breaks moving the child
// HWNDs for some reason.
window_pos->flags &= ~(SWP_NOSIZE | SWP_NOMOVE | SWP_NOREDRAW);
window_pos->flags |= SWP_NOCOPYBITS;
// Now ignore all immediately-following SetWindowPos() changes. Windows
// likes to (incorrectly) recalculate what our position/size should be
// and send us further updates.
ignore_window_pos_changes_ = true;
base::ThreadTaskRunnerHandle::Get()->PostTask(
FROM_HERE, base::Bind(&HWNDMessageHandler::StopIgnoringPosChanges,
weak_factory_.GetWeakPtr()));
}
last_monitor_ = monitor;
last_monitor_rect_ = monitor_rect;
last_work_area_ = work_area;
}
}
RECT window_rect;
gfx::Size old_size;
if (GetWindowRect(hwnd(), &window_rect))
old_size = gfx::Rect(window_rect).size();
gfx::Size new_size = gfx::Size(window_pos->cx, window_pos->cy);
if ((old_size != new_size && !(window_pos->flags & SWP_NOSIZE)) ||
window_pos->flags & SWP_FRAMECHANGED) {
delegate_->HandleWindowSizeChanging();
sent_window_size_changing_ = true;
// It's possible that if Aero snap is being entered then the window size
// won't actually change. Post a message to ensure swaps will be re-enabled
// in that case.
PostMessage(hwnd(), WM_WINDOWSIZINGFINISHED, ++current_window_size_message_,
0);
}
if (ScopedFullscreenVisibility::IsHiddenForFullscreen(hwnd())) {
// Prevent the window from being made visible if we've been asked to do so.
// See comment in header as to why we might want this.
window_pos->flags &= ~SWP_SHOWWINDOW;
}
if (window_pos->flags & SWP_SHOWWINDOW)
delegate_->HandleVisibilityChanging(true);
else if (window_pos->flags & SWP_HIDEWINDOW) {
SetDwmFrameExtension(DwmFrameState::OFF);
delegate_->HandleVisibilityChanging(false);
}
SetMsgHandled(FALSE);
}
void HWNDMessageHandler::OnWindowPosChanged(WINDOWPOS* window_pos) {
if (DidClientAreaSizeChange(window_pos))
ClientAreaSizeChanged();
if (window_pos->flags & SWP_FRAMECHANGED)
SetDwmFrameExtension(DwmFrameState::ON);
if (window_pos->flags & SWP_SHOWWINDOW) {
delegate_->HandleVisibilityChanged(true);
if (direct_manipulation_helper_)
direct_manipulation_helper_->Activate(hwnd());
SetDwmFrameExtension(DwmFrameState::ON);
} else if (window_pos->flags & SWP_HIDEWINDOW) {
delegate_->HandleVisibilityChanged(false);
if (direct_manipulation_helper_)
direct_manipulation_helper_->Deactivate(hwnd());
}
SetMsgHandled(FALSE);
}
LRESULT HWNDMessageHandler::OnWindowSizingFinished(UINT message,
WPARAM w_param,
LPARAM l_param) {
// Check if a newer WM_WINDOWPOSCHANGING or WM_WINDOWPOSCHANGED have been
// received after this message was posted.
if (current_window_size_message_ != w_param)
return 0;
delegate_->HandleWindowSizeUnchanged();
sent_window_size_changing_ = false;
return 0;
}
void HWNDMessageHandler::OnSessionChange(WPARAM status_code) {
// Direct3D presents are ignored while the screen is locked, so force the
// window to be redrawn on unlock.
if (status_code == WTS_SESSION_UNLOCK)
ForceRedrawWindow(10);
}
void HWNDMessageHandler::HandleTouchEvents(const TouchEvents& touch_events) {
base::WeakPtr<HWNDMessageHandler> ref(weak_factory_.GetWeakPtr());
for (size_t i = 0; i < touch_events.size() && ref; ++i)
delegate_->HandleTouchEvent(touch_events[i]);
}
void HWNDMessageHandler::ResetTouchDownContext() {
touch_down_contexts_--;
}
LRESULT HWNDMessageHandler::HandleMouseEventInternal(UINT message,
WPARAM w_param,
LPARAM l_param,
bool track_mouse) {
// We handle touch events on Windows Aura. Windows generates synthesized
// mouse messages in response to touch which we should ignore. However touch
// messages are only received for the client area. We need to ignore the
// synthesized mouse messages for all points in the client area and places
// which return HTNOWHERE.
// TODO(ananta)
// Windows does not reliably set the touch flag on mouse messages. Look into
// a better way of identifying mouse messages originating from touch.
if ((message != WM_MOUSEWHEEL && message != WM_MOUSEHWHEEL) &&
(ui::IsMouseEventFromTouch(message))) {
LPARAM l_param_ht = l_param;
// For mouse events (except wheel events), location is in window coordinates
// and should be converted to screen coordinates for WM_NCHITTEST.
POINT screen_point = CR_POINT_INITIALIZER_FROM_LPARAM(l_param_ht);
MapWindowPoints(hwnd(), HWND_DESKTOP, &screen_point, 1);
l_param_ht = MAKELPARAM(screen_point.x, screen_point.y);
LRESULT hittest = SendMessage(hwnd(), WM_NCHITTEST, 0, l_param_ht);
if (hittest == HTCLIENT || hittest == HTNOWHERE)
return 0;
}
// Certain logitech drivers send the WM_MOUSEHWHEEL message to the parent
// followed by WM_MOUSEWHEEL messages to the child window causing a vertical
// scroll. We treat these WM_MOUSEWHEEL messages as WM_MOUSEHWHEEL
// messages.
if (message == WM_MOUSEHWHEEL)
last_mouse_hwheel_time_ = ::GetMessageTime();
if (message == WM_MOUSEWHEEL &&
::GetMessageTime() == last_mouse_hwheel_time_) {
message = WM_MOUSEHWHEEL;
}
if (message == WM_RBUTTONUP && is_right_mouse_pressed_on_caption_) {
is_right_mouse_pressed_on_caption_ = false;
ReleaseCapture();
// |point| is in window coordinates, but WM_NCHITTEST and TrackPopupMenu()
// expect screen coordinates.
POINT screen_point = CR_POINT_INITIALIZER_FROM_LPARAM(l_param);
MapWindowPoints(hwnd(), HWND_DESKTOP, &screen_point, 1);
w_param = SendMessage(hwnd(), WM_NCHITTEST, 0,
MAKELPARAM(screen_point.x, screen_point.y));
if (w_param == HTCAPTION || w_param == HTSYSMENU) {
gfx::ShowSystemMenuAtPoint(hwnd(), gfx::Point(screen_point));
return 0;
}
} else if (message == WM_NCLBUTTONDOWN &&
delegate_->GetFrameMode() == FrameMode::CUSTOM_DRAWN) {
switch (w_param) {
case HTCLOSE:
case HTMINBUTTON:
case HTMAXBUTTON: {
// When the mouse is pressed down in these specific non-client areas,
// we need to tell the RootView to send the mouse pressed event (which
// sets capture, allowing subsequent WM_LBUTTONUP (note, _not_
// WM_NCLBUTTONUP) to fire so that the appropriate WM_SYSCOMMAND can be
// sent by the applicable button's ButtonListener. We _have_ to do this
// way rather than letting Windows just send the syscommand itself (as
// would happen if we never did this dance) because for some insane
// reason DefWindowProc for WM_NCLBUTTONDOWN also renders the pressed
// window control button appearance, in the Windows classic style, over
// our view! Ick! By handling this message we prevent Windows from
// doing this undesirable thing, but that means we need to roll the
// sys-command handling ourselves.
// Combine |w_param| with common key state message flags.
w_param |= ui::win::IsCtrlPressed() ? MK_CONTROL : 0;
w_param |= ui::win::IsShiftPressed() ? MK_SHIFT : 0;
}
}
} else if (message == WM_NCRBUTTONDOWN &&
(w_param == HTCAPTION || w_param == HTSYSMENU)) {
is_right_mouse_pressed_on_caption_ = true;
// We SetCapture() to ensure we only show the menu when the button
// down and up are both on the caption. Note: this causes the button up to
// be WM_RBUTTONUP instead of WM_NCRBUTTONUP.
SetCapture();
}
long message_time = GetMessageTime();
MSG msg = { hwnd(), message, w_param, l_param,
static_cast<DWORD>(message_time),
{ CR_GET_X_LPARAM(l_param), CR_GET_Y_LPARAM(l_param) } };
ui::MouseEvent event(msg);
if (IsSynthesizedMouseMessage(message, message_time, l_param))
event.set_flags(event.flags() | ui::EF_FROM_TOUCH);
if (event.type() == ui::ET_MOUSE_MOVED && !HasCapture() && track_mouse) {
// Windows only fires WM_MOUSELEAVE events if the application begins
// "tracking" mouse events for a given HWND during WM_MOUSEMOVE events.
// We need to call |TrackMouseEvents| to listen for WM_MOUSELEAVE.
TrackMouseEvents((message == WM_NCMOUSEMOVE) ?
TME_NONCLIENT | TME_LEAVE : TME_LEAVE);
} else if (event.type() == ui::ET_MOUSE_EXITED) {
// Reset our tracking flags so future mouse movement over this
// NativeWidget results in a new tracking session. Fall through for
// OnMouseEvent.
active_mouse_tracking_flags_ = 0;
} else if (event.type() == ui::ET_MOUSEWHEEL) {
// Reroute the mouse wheel to the window under the pointer if applicable.
return (ui::RerouteMouseWheel(hwnd(), w_param, l_param) ||
delegate_->HandleMouseEvent(ui::MouseWheelEvent(msg))) ? 0 : 1;
}
// There are cases where the code handling the message destroys the window,
// so use the weak ptr to check if destruction occured or not.
base::WeakPtr<HWNDMessageHandler> ref(weak_factory_.GetWeakPtr());
bool handled = delegate_->HandleMouseEvent(event);
if (!ref.get())
return 0;
if (direct_manipulation_helper_ && track_mouse &&
(message == WM_MOUSEWHEEL || message == WM_MOUSEHWHEEL)) {
direct_manipulation_helper_->HandleMouseWheel(hwnd(), message, w_param,
l_param);
}
if (!handled && message == WM_NCLBUTTONDOWN && w_param != HTSYSMENU &&
w_param != HTCAPTION &&
delegate_->GetFrameMode() == FrameMode::CUSTOM_DRAWN) {
// TODO(msw): Eliminate undesired painting, or re-evaluate this workaround.
// DefWindowProc for WM_NCLBUTTONDOWN does weird non-client painting, so we
// need to call it inside a ScopedRedrawLock. This may cause other negative
// side-effects (ex/ stifling non-client mouse releases).
DefWindowProcWithRedrawLock(message, w_param, l_param);
handled = true;
}
// We need special processing for mouse input on the caption.
// Please refer to the HandleMouseInputForCaption() function for more
// information.
if (!handled)
handled = HandleMouseInputForCaption(message, w_param, l_param);
if (ref.get())
SetMsgHandled(handled);
return 0;
}
bool HWNDMessageHandler::IsSynthesizedMouseMessage(unsigned int message,
int message_time,
LPARAM l_param) {
if (ui::IsMouseEventFromTouch(message))
return true;
// Ignore mouse messages which occur at the same location as the current
// cursor position and within a time difference of 500 ms from the last
// touch message.
if (last_touch_message_time_ && message_time >= last_touch_message_time_ &&
((message_time - last_touch_message_time_) <=
kSynthesizedMouseTouchMessagesTimeDifference)) {
POINT mouse_location = CR_POINT_INITIALIZER_FROM_LPARAM(l_param);
::ClientToScreen(hwnd(), &mouse_location);
POINT cursor_pos = {0};
::GetCursorPos(&cursor_pos);
if (memcmp(&cursor_pos, &mouse_location, sizeof(POINT)))
return false;
return true;
}
return false;
}
void HWNDMessageHandler::PerformDwmTransition() {
dwm_transition_desired_ = false;
UpdateDwmNcRenderingPolicy();
// Don't redraw the window here, because we need to hide and show the window
// which will also trigger a redraw.
ResetWindowRegion(true, false);
// The non-client view needs to update too.
delegate_->HandleFrameChanged();
if (IsVisible() && delegate_->GetFrameMode() == FrameMode::SYSTEM_DRAWN) {
// For some reason, we need to hide the window after we change from a custom
// frame to a native frame. If we don't, the client area will be filled
// with black. This seems to be related to an interaction between DWM and
// SetWindowRgn, but the details aren't clear. Additionally, we need to
// specify SWP_NOZORDER here, otherwise if you have multiple chrome windows
// open they will re-appear with a non-deterministic Z-order.
UINT flags = SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER;
SetWindowPos(hwnd(), NULL, 0, 0, 0, 0, flags | SWP_HIDEWINDOW);
SetWindowPos(hwnd(), NULL, 0, 0, 0, 0, flags | SWP_SHOWWINDOW);
}
// WM_DWMCOMPOSITIONCHANGED is only sent to top level windows, however we want
// to notify our children too, since we can have MDI child windows who need to
// update their appearance.
EnumChildWindows(hwnd(), &SendDwmCompositionChanged, NULL);
}
void HWNDMessageHandler::GenerateTouchEvent(ui::EventType event_type,
const gfx::Point& point,
unsigned int id,
base::TimeTicks time_stamp,
TouchEvents* touch_events) {
ui::TouchEvent event(event_type, point, id, time_stamp);
event.set_flags(ui::GetModifiersFromKeyState());
event.latency()->AddLatencyNumberWithTimestamp(
ui::INPUT_EVENT_LATENCY_ORIGINAL_COMPONENT,
0,
0,
time_stamp,
1);
touch_events->push_back(event);
}
bool HWNDMessageHandler::HandleMouseInputForCaption(unsigned int message,
WPARAM w_param,
LPARAM l_param) {
// If we are receive a WM_NCLBUTTONDOWN messsage for the caption, the
// following things happen.
// 1. This message is defproced which will post a WM_SYSCOMMAND message with
// SC_MOVE and a constant 0x0002 which is documented on msdn as
// SC_DRAGMOVE.
// 2. The WM_SYSCOMMAND message is defproced in our handler which works
// correctly in all cases except the case when we click on the caption
// and hold. The defproc appears to try and detect whether a mouse move
// is going to happen presumably via the DragEnter or a similar
// implementation which in its modal loop appears to only peek for
// mouse input briefly.
// 3. Our workhorse message pump relies on the tickler posted message to get
// control during modal loops which does not happen in the above case for
// a while leading to the problem where activity on the page pauses
// briefly or at times stops for a while.
// To fix this we don't defproc the WM_NCLBUTTONDOWN message and instead wait
// for the subsequent WM_NCMOUSEMOVE/WM_MOUSEMOVE message. Once we receive
// these messages and the mouse actually moved, we defproc the
// WM_NCLBUTTONDOWN message.
bool handled = false;
switch (message) {
case WM_NCLBUTTONDOWN: {
if (w_param == HTCAPTION) {
left_button_down_on_caption_ = true;
// Cache the location where the click occurred. We use this in the
// WM_NCMOUSEMOVE message to determine if the mouse actually moved.F
caption_left_button_click_pos_.set_x(CR_GET_X_LPARAM(l_param));
caption_left_button_click_pos_.set_y(CR_GET_Y_LPARAM(l_param));
handled = true;
}
break;
}
// WM_NCMOUSEMOVE is received for normal drags which originate on the
// caption and stay there.
// WM_MOUSEMOVE can be received for drags which originate on the caption
// and move towards the client area.
case WM_MOUSEMOVE:
case WM_NCMOUSEMOVE: {
if (!left_button_down_on_caption_)
break;
bool should_handle_pending_ncl_button_down = true;
// Check if the mouse actually moved.
if (message == WM_NCMOUSEMOVE) {
if (caption_left_button_click_pos_.x() == CR_GET_X_LPARAM(l_param) &&
caption_left_button_click_pos_.y() == CR_GET_Y_LPARAM(l_param)) {
should_handle_pending_ncl_button_down = false;
}
}
if (should_handle_pending_ncl_button_down) {
l_param = MAKELPARAM(caption_left_button_click_pos_.x(),
caption_left_button_click_pos_.y());
// TODO(msw): Eliminate undesired painting, or re-evaluate this
// workaround.
// DefWindowProc for WM_NCLBUTTONDOWN does weird non-client painting,
// so we need to call it inside a ScopedRedrawLock. This may cause
// other negative side-effects
// (ex/ stifling non-client mouse releases).
// We may be deleted in the context of DefWindowProc. Don't refer to
// any member variables after the DefWindowProc call.
left_button_down_on_caption_ = false;
if (delegate_->GetFrameMode() == FrameMode::CUSTOM_DRAWN) {
DefWindowProcWithRedrawLock(WM_NCLBUTTONDOWN, HTCAPTION, l_param);
} else {
DefWindowProc(hwnd(), WM_NCLBUTTONDOWN, HTCAPTION, l_param);
}
}
break;
}
case WM_NCMOUSELEAVE:
break;
default:
left_button_down_on_caption_ = false;
break;
}
return handled;
}
void HWNDMessageHandler::SetBoundsInternal(const gfx::Rect& bounds_in_pixels,
bool force_size_changed) {
LONG style = GetWindowLong(hwnd(), GWL_STYLE);
if (style & WS_MAXIMIZE)
SetWindowLong(hwnd(), GWL_STYLE, style & ~WS_MAXIMIZE);
gfx::Size old_size = GetClientAreaBounds().size();
SetWindowPos(hwnd(), NULL, bounds_in_pixels.x(), bounds_in_pixels.y(),
bounds_in_pixels.width(), bounds_in_pixels.height(),
SWP_NOACTIVATE | SWP_NOZORDER);
// If HWND size is not changed, we will not receive standard size change
// notifications. If |force_size_changed| is |true|, we should pretend size is
// changed.
if (old_size == bounds_in_pixels.size() && force_size_changed &&
!background_fullscreen_hack_) {
delegate_->HandleClientSizeChanged(GetClientAreaBounds().size());
ResetWindowRegion(false, true);
}
if (direct_manipulation_helper_)
direct_manipulation_helper_->SetBounds(bounds_in_pixels);
}
void HWNDMessageHandler::CheckAndHandleBackgroundFullscreenOnMonitor(
HWND window) {
HMONITOR monitor = MonitorFromWindow(window, MONITOR_DEFAULTTOPRIMARY);
FullscreenWindowMonitorMap::iterator iter =
fullscreen_monitor_map_.Get().find(monitor);
if (iter != fullscreen_monitor_map_.Get().end()) {
DCHECK(iter->second);
if (window != iter->second->hwnd())
iter->second->OnBackgroundFullscreen();
}
}
void HWNDMessageHandler::OnBackgroundFullscreen() {
// Reduce the bounds of the window by 1px to ensure that Windows does
// not treat this like a fullscreen window.
MONITORINFO monitor_info = {sizeof(monitor_info)};
GetMonitorInfo(MonitorFromWindow(hwnd(), MONITOR_DEFAULTTOPRIMARY),
&monitor_info);
gfx::Rect shrunk_rect(monitor_info.rcMonitor);
shrunk_rect.set_height(shrunk_rect.height() - 1);
background_fullscreen_hack_ = true;
SetBoundsInternal(shrunk_rect, false);
}
} // namespace views