blob: 72dc6646884c06a1a3002d04af346281537f083a [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 <wrl/client.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/message_loop/message_loop_current.h"
#include "base/single_thread_task_runner.h"
#include "base/threading/thread_task_runner_handle.h"
#include "base/time/time.h"
#include "base/trace_event/trace_event.h"
#include "base/win/scoped_gdi_object.h"
#include "base/win/windows_version.h"
#include "third_party/skia/include/core/SkPath.h"
#include "ui/accessibility/accessibility_switches.h"
#include "ui/accessibility/platform/ax_platform_node_win.h"
#include "ui/accessibility/platform/ax_system_caret_win.h"
#include "ui/base/ime/input_method.h"
#include "ui/base/ime/text_input_client.h"
#include "ui/base/ime/text_input_type.h"
#include "ui/base/ui_base_features.h"
#include "ui/base/view_prop.h"
#include "ui/base/win/hwnd_metrics.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_constants.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_win.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/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;
}
bool IsDwmCompositionEnabled() {
BOOL is_dwm_composition_enabled;
DwmIsCompositionEnabled(&is_dwm_composition_enabled);
return static_cast<bool>(is_dwm_composition_enabled);
}
// 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());
}
ui::EventType GetTouchEventType(POINTER_FLAGS pointer_flags) {
if (pointer_flags & POINTER_FLAG_DOWN)
return ui::ET_TOUCH_PRESSED;
if (pointer_flags & POINTER_FLAG_UPDATE)
return ui::ET_TOUCH_MOVED;
if (pointer_flags & POINTER_FLAG_UP)
return ui::ET_TOUCH_RELEASED;
return ui::ET_TOUCH_MOVED;
}
bool IsHitTestOnResizeHandle(LRESULT hittest) {
return hittest == HTRIGHT || hittest == HTLEFT || hittest == HTTOP ||
hittest == HTBOTTOM || hittest == HTTOPLEFT || hittest == HTTOPRIGHT ||
hittest == HTBOTTOMLEFT || hittest == HTBOTTOMRIGHT;
}
// Convert |param| to the HitTest used in WindowResizeUtils.
HitTest GetWindowResizeHitTest(UINT param) {
switch (param) {
case WMSZ_BOTTOM:
return HitTest::kBottom;
case WMSZ_TOP:
return HitTest::kTop;
case WMSZ_LEFT:
return HitTest::kLeft;
case WMSZ_RIGHT:
return HitTest::kRight;
case WMSZ_TOPLEFT:
return HitTest::kTopLeft;
case WMSZ_TOPRIGHT:
return HitTest::kTopRight;
case WMSZ_BOTTOMLEFT:
return HitTest::kBottomLeft;
case WMSZ_BOTTOMRIGHT:
return HitTest::kBottomRight;
default:
NOTREACHED();
return HitTest::kBottomRight;
}
}
const int kTouchDownContextResetTimeout = 500;
// Windows does not flag synthesized mouse messages from touch or pen 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/pen message and the mouse move is within 500 ms and at the
// same location as the cursor.
const int kSynthesizedMouseMessagesTimeDifference = 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.
//
// This lock is disabled when DirectComposition is used and there's a child
// rendering window, as the WS_CLIPCHILDREN on the parent window should
// prevent the glitched rendering and making the window contents non-visible
// can cause a them to disappear for a frame.
//
// We normally skip locked updates when Aero is on for two reasons:
// 1. Because it isn't necessary. However, for windows without WS_CAPTION a
// close button may still be drawn, so the resize lock remains enabled for
// them. See http://crrev.com/130323
// 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.
//
// 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()),
cancel_unlock_(false),
should_lock_(owner_->IsVisible() && !owner->HasChildRenderingWindow() &&
::IsWindow(hwnd_) &&
(!(GetWindowLong(hwnd_, GWL_STYLE) & WS_CAPTION) ||
!ui::win::IsAeroGlassEnabled())) {
if (should_lock_)
owner_->LockUpdates();
}
~ScopedRedrawLock() {
if (!cancel_unlock_ && should_lock_ && ::IsWindow(hwnd_))
owner_->UnlockUpdates();
}
// 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_;
// A flag indicating that the unlock operation was canceled.
bool cancel_unlock_;
// If false, don't use redraw lock.
const bool should_lock_;
DISALLOW_COPY_AND_ASSIGN(ScopedRedrawLock);
};
// static HWNDMessageHandler member initialization.
base::LazyInstance<HWNDMessageHandler::FullscreenWindowMonitorMap>::
DestructorAtExit HWNDMessageHandler::fullscreen_monitor_map_ =
LAZY_INSTANCE_INITIALIZER;
////////////////////////////////////////////////////////////////////////////////
// HWNDMessageHandler, public:
long HWNDMessageHandler::last_touch_or_pen_message_time_ = 0;
HWNDMessageHandler::HWNDMessageHandler(HWNDMessageHandlerDelegate* delegate)
: 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),
called_enable_non_client_dpi_scaling_(false),
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),
pen_processor_(
&id_generator_,
base::FeatureList::IsEnabled(features::kDirectManipulationStylus)),
touch_down_contexts_(0),
last_mouse_hwheel_time_(0),
dwm_transition_desired_(false),
dwm_composition_enabled_(IsDwmCompositionEnabled()),
sent_window_size_changing_(false),
left_button_down_on_caption_(false),
background_fullscreen_hack_(false),
pointer_events_for_touch_(features::IsUsingWMPointerForTouch()),
precision_touchpad_scroll_phase_enabled_(base::FeatureList::IsEnabled(
features::kPrecisionTouchpadScrollPhase)),
autohide_factory_(this) {}
HWNDMessageHandler::~HWNDMessageHandler() {
DCHECK(delegate_->GetHWNDMessageDelegateInputMethod());
delegate_->GetHWNDMessageDelegateInputMethod()->RemoveObserver(this);
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 (!called_enable_non_client_dpi_scaling_ &&
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)));
DCHECK(delegate_->GetHWNDMessageDelegateInputMethod());
delegate_->GetHWNDMessageDelegateInputMethod()->AddObserver(this);
// 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::BindOnce(&HWNDMessageHandler::CloseNow,
msg_handler_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() &&
!is_translucent_) {
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(ui::WindowShowState show_state,
const gfx::Rect& pixel_restore_bounds) {
TRACE_EVENT0("views", "HWNDMessageHandler::Show");
DWORD native_show_state;
if (show_state == ui::SHOW_STATE_MAXIMIZED &&
!pixel_restore_bounds.IsEmpty()) {
WINDOWPLACEMENT placement = {0};
placement.length = sizeof(WINDOWPLACEMENT);
placement.showCmd = SW_SHOWMAXIMIZED;
placement.rcNormalPosition = pixel_restore_bounds.ToRECT();
SetWindowPlacement(hwnd(), &placement);
native_show_state = SW_SHOWMAXIMIZED;
} else {
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:
if ((GetWindowLong(hwnd(), GWL_EXSTYLE) & WS_EX_TRANSPARENT) ||
(GetWindowLong(hwnd(), GWL_EXSTYLE) & WS_EX_NOACTIVATE)) {
native_show_state = SW_SHOWNOACTIVATE;
} else {
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::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::MessageLoopCurrent::ScopedNestableTaskAllower allow_nested;
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() {
needs_dwm_frame_clear_ = true;
if (!custom_window_region_.is_valid() && IsFrameSystemDrawn())
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);
// 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);
}
// 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();
}
void HWNDMessageHandler::SetAspectRatio(float aspect_ratio) {
// If the aspect ratio is not in the valid range, do nothing.
DCHECK_GT(aspect_ratio, 0.0f);
aspect_ratio_ = aspect_ratio;
// When the aspect ratio is set, size the window to adhere to it. This keeps
// the same origin point as the original window.
RECT window_rect;
if (GetWindowRect(hwnd(), &window_rect)) {
gfx::Rect rect(window_rect);
SizeRectToAspectRatio(WMSZ_BOTTOMRIGHT, &rect);
SetBoundsInternal(rect, false);
}
}
void HWNDMessageHandler::SizeConstraintsChanged() {
LONG style = GetWindowLong(hwnd(), GWL_STYLE);
// Ignore if this is not a standard window.
if (style & (WS_POPUP | WS_CHILD))
return;
// Windows cannot have WS_THICKFRAME set if translucent.
// See CalculateWindowStylesFromInitParams().
if (delegate_->CanResize() && !is_translucent_) {
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(msg_handler_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;
}
void HWNDMessageHandler::OnFocus() {}
void HWNDMessageHandler::OnBlur() {}
void HWNDMessageHandler::OnCaretBoundsChanged(
const ui::TextInputClient* client) {
if (!ax_system_caret_)
ax_system_caret_ = std::make_unique<ui::AXSystemCaretWin>(hwnd());
if (!client || client->GetTextInputType() == ui::TEXT_INPUT_TYPE_NONE) {
ax_system_caret_->Hide();
return;
}
const gfx::Rect dip_caret_bounds(client->GetCaretBounds());
gfx::Rect caret_bounds =
display::win::ScreenWin::DIPToScreenRect(hwnd(), dip_caret_bounds);
// Collapse any selection.
caret_bounds.set_width(1);
ax_system_caret_->MoveCaretTo(caret_bounds);
}
void HWNDMessageHandler::OnTextInputStateChanged(
const ui::TextInputClient* client) {
if (!client || client->GetTextInputType() == ui::TEXT_INPUT_TYPE_NONE)
OnCaretBoundsChanged(client);
}
void HWNDMessageHandler::OnInputMethodDestroyed(
const ui::InputMethod* input_method) {
DestroyAXSystemCaret();
}
void HWNDMessageHandler::OnShowVirtualKeyboardIfEnabled() {}
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(msg_handler_weak_factory_.GetWeakPtr());
LRESULT ret = HandleMouseEventInternal(message, w_param, l_param, false);
*handled = !ref.get() || msg_handled_;
return ret;
}
LRESULT HWNDMessageHandler::HandleKeyboardMessage(unsigned int message,
WPARAM w_param,
LPARAM l_param,
bool* handled) {
base::WeakPtr<HWNDMessageHandler> ref(msg_handler_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 = !ref.get() || msg_handled_;
return ret;
}
LRESULT HWNDMessageHandler::HandleTouchMessage(unsigned int message,
WPARAM w_param,
LPARAM l_param,
bool* handled) {
base::WeakPtr<HWNDMessageHandler> ref(msg_handler_weak_factory_.GetWeakPtr());
LRESULT ret = OnTouchEvent(message, w_param, l_param);
*handled = !ref.get() || msg_handled_;
return ret;
}
LRESULT HWNDMessageHandler::HandlePointerMessage(unsigned int message,
WPARAM w_param,
LPARAM l_param,
bool* handled) {
base::WeakPtr<HWNDMessageHandler> ref(msg_handler_weak_factory_.GetWeakPtr());
LRESULT ret = OnPointerEvent(message, w_param, l_param);
*handled = !ref.get() || msg_handled_;
return ret;
}
LRESULT HWNDMessageHandler::HandleScrollMessage(unsigned int message,
WPARAM w_param,
LPARAM l_param,
bool* handled) {
base::WeakPtr<HWNDMessageHandler> ref(msg_handler_weak_factory_.GetWeakPtr());
LRESULT ret = OnScrollMessage(message, w_param, l_param);
*handled = !ref.get() || msg_handled_;
return ret;
}
LRESULT HWNDMessageHandler::HandleNcHitTestMessage(unsigned int message,
WPARAM w_param,
LPARAM l_param,
bool* handled) {
base::WeakPtr<HWNDMessageHandler> ref(msg_handler_weak_factory_.GetWeakPtr());
LRESULT ret = OnNCHitTest(
gfx::Point(CR_GET_X_LPARAM(l_param), CR_GET_Y_LPARAM(l_param)));
*handled = !ref.get() || msg_handled_;
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();
}
void HWNDMessageHandler::ApplyPinchZoomScale(float scale) {
POINT cursor_pos = {0};
::GetCursorPos(&cursor_pos);
ScreenToClient(hwnd(), &cursor_pos);
ui::GestureEventDetails event_details(ui::ET_GESTURE_PINCH_UPDATE);
event_details.set_device_type(ui::GestureDeviceType::DEVICE_TOUCHPAD);
event_details.set_scale(scale);
ui::GestureEvent event(cursor_pos.x, cursor_pos.y, ui::EF_NONE,
base::TimeTicks::Now(), event_details);
delegate_->HandleGestureEvent(&event);
}
void HWNDMessageHandler::ApplyPinchZoomBegin() {
POINT cursor_pos = {0};
::GetCursorPos(&cursor_pos);
ScreenToClient(hwnd(), &cursor_pos);
ui::GestureEventDetails event_details(ui::ET_GESTURE_PINCH_BEGIN);
event_details.set_device_type(ui::GestureDeviceType::DEVICE_TOUCHPAD);
ui::GestureEvent event(cursor_pos.x, cursor_pos.y, ui::EF_NONE,
base::TimeTicks::Now(), event_details);
delegate_->HandleGestureEvent(&event);
}
void HWNDMessageHandler::ApplyPinchZoomEnd() {
POINT cursor_pos = {0};
::GetCursorPos(&cursor_pos);
ScreenToClient(hwnd(), &cursor_pos);
ui::GestureEventDetails event_details(ui::ET_GESTURE_PINCH_END);
event_details.set_device_type(ui::GestureDeviceType::DEVICE_TOUCHPAD);
ui::GestureEvent event(cursor_pos.x, cursor_pos.y, ui::EF_NONE,
base::TimeTicks::Now(), event_details);
delegate_->HandleGestureEvent(&event);
}
void HWNDMessageHandler::ApplyPanGestureEvent(
int scroll_x,
int scroll_y,
ui::EventMomentumPhase momentum_phase,
ui::ScrollEventPhase phase) {
gfx::Vector2d offset{scroll_x, scroll_y};
POINT root_location = {0};
::GetCursorPos(&root_location);
POINT location = {root_location.x, root_location.y};
ScreenToClient(hwnd(), &location);
gfx::Point cursor_location(location);
gfx::Point cursor_root_location(root_location);
int modifiers = ui::GetModifiersFromKeyState();
if (precision_touchpad_scroll_phase_enabled_) {
ui::ScrollEvent event(ui::ET_SCROLL, cursor_location, ui::EventTimeForNow(),
modifiers, scroll_x, scroll_y, scroll_x, scroll_y, 2,
momentum_phase, phase);
delegate_->HandleScrollEvent(&event);
} else {
ui::MouseWheelEvent wheel_event(
offset, cursor_location, cursor_root_location, base::TimeTicks::Now(),
modifiers | ui::EF_PRECISION_SCROLLING_DELTA, ui::EF_NONE);
delegate_->HandleMouseEvent(&wheel_event);
}
}
void HWNDMessageHandler::ApplyPanGestureScroll(int scroll_x, int scroll_y) {
ApplyPanGestureEvent(scroll_x, scroll_y, ui::EventMomentumPhase::NONE,
ui::ScrollEventPhase::kUpdate);
}
void HWNDMessageHandler::ApplyPanGestureFling(int scroll_x, int scroll_y) {
ApplyPanGestureEvent(scroll_x, scroll_y,
ui::EventMomentumPhase::INERTIAL_UPDATE,
ui::ScrollEventPhase::kNone);
}
void HWNDMessageHandler::ApplyPanGestureScrollBegin(int scroll_x,
int scroll_y) {
// Phase information will be ingored in ApplyPanGestureEvent().
ApplyPanGestureEvent(scroll_x, scroll_y, ui::EventMomentumPhase::NONE,
ui::ScrollEventPhase::kBegan);
}
void HWNDMessageHandler::ApplyPanGestureScrollEnd() {
if (!precision_touchpad_scroll_phase_enabled_)
return;
ApplyPanGestureEvent(0, 0, ui::EventMomentumPhase::NONE,
ui::ScrollEventPhase::kEnd);
}
void HWNDMessageHandler::ApplyPanGestureFlingBegin() {
if (!precision_touchpad_scroll_phase_enabled_)
return;
ApplyPanGestureEvent(0, 0, ui::EventMomentumPhase::BEGAN,
ui::ScrollEventPhase::kNone);
}
void HWNDMessageHandler::ApplyPanGestureFlingEnd() {
if (!precision_touchpad_scroll_phase_enabled_)
return;
ApplyPanGestureEvent(0, 0, ui::EventMomentumPhase::END,
ui::ScrollEventPhase::kNone);
}
////////////////////////////////////////////////////////////////////////////////
// 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);
// Inform the taskbar that this window is now a fullscreen window so it go
// behind the window in the Z-Order. The taskbar heuristics to detect
// fullscreen windows are not reliable. Marking it explicitly seems to work
// around these problems.
fullscreen_handler()->MarkFullscreen(true);
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,
HMONITOR monitor) const {
if (delegate_->GetClientAreaInsets(insets, monitor))
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 frame_thickness = ui::GetFrameThickness(monitor);
if (!delegate_->HasFrame())
frame_thickness -= 1;
*insets = gfx::Insets(frame_thickness, frame_thickness, frame_thickness,
frame_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_LAYERED automatically makes clicks on transparent pixels fall
// through, but that isn't the case when using Direct3D to draw transparent
// windows. So we route translucent windows throught to the delegate to
// allow for a custom hit mask.
if (!is_translucent_ && !custom_window_region_.is_valid() &&
(IsFrameSystemDrawn() || !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 {
SkPath 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(msg_handler_weak_factory_.GetWeakPtr());
LRESULT result = DefWindowProc(hwnd(), message, w_param, l_param);
if (!ref)
lock.CancelUnlockOperation();
return result;
}
void HWNDMessageHandler::LockUpdates() {
if (++lock_updates_count_ == 1) {
SetWindowLong(hwnd(), GWL_STYLE,
GetWindowLong(hwnd(), GWL_STYLE) & ~WS_VISIBLE);
}
}
void HWNDMessageHandler::UnlockUpdates() {
if (--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::BindOnce(&HWNDMessageHandler::ForceRedrawWindow,
msg_handler_weak_factory_.GetWeakPtr(), attempts),
base::TimeDelta::FromMilliseconds(500));
return;
}
InvalidateRect(hwnd(), NULL, FALSE);
}
bool HWNDMessageHandler::IsFrameSystemDrawn() const {
FrameMode frame_mode = delegate_->GetFrameMode();
return frame_mode == FrameMode::SYSTEM_DRAWN ||
frame_mode == FrameMode::SYSTEM_DRAWN_NO_CONTROLS;
}
bool HWNDMessageHandler::HasSystemFrame() const {
return delegate_->HasFrame() && IsFrameSystemDrawn();
}
// 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 (is_translucent_) {
// This is part of the magic to emulate layered windows with Aura
// see the explanation elsewere when we set is_translucent_.
MARGINS margins = {-1, -1, -1, -1};
DwmExtendFrameIntoClientArea(hwnd(), &margins);
::SetProp(hwnd(), ui::kWindowTranslucent, reinterpret_cast<HANDLE>(1));
}
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 (!pointer_events_for_touch_)
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))));
dpi_ = display::win::ScreenWin::GetDPIForHWND(hwnd());
// TODO(beng): move more of NWW::OnCreate here.
return 0;
}
void HWNDMessageHandler::OnDestroy() {
::RemoveProp(hwnd(), ui::kWindowTranslucent);
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;
}
bool dwm_composition_enabled = IsDwmCompositionEnabled();
if (dwm_composition_enabled_ != dwm_composition_enabled) {
// Do not cause the Window to be hidden and shown unless there was
// an actual change in the theme. This filter is necessary because
// Windows sends redundant WM_DWMCOMPOSITIONCHANGED messages when
// a laptop is reopened, and our theme change code causes wonky
// focus issues. See http://crbug.com/895855 for more information.
dwm_composition_enabled_ = dwm_composition_enabled;
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";
int dpi;
float scaling_factor;
if (display::Display::HasForceDeviceScaleFactor()) {
scaling_factor = display::Display::GetForcedDeviceScaleFactor();
dpi = display::win::GetDPIFromScalingFactor(scaling_factor);
} else {
dpi = LOWORD(w_param);
scaling_factor = display::win::ScreenWin::GetScaleFactorForDPI(dpi);
}
// 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.
if (dpi_ == dpi)
return 0;
dpi_ = dpi;
SetBoundsInternal(gfx::Rect(*reinterpret_cast<RECT*>(l_param)), false);
delegate_->HandleWindowScaleFactorChanged(scaling_factor);
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) {
gfx::Insets insets;
if (ui::win::IsAeroGlassEnabled() &&
delegate_->GetDwmFrameInsetsInPixels(&insets) && !insets.IsEmpty() &&
needs_dwm_frame_clear_) {
// This is necessary to avoid white flashing in the titlebar area around the
// minimize/maximize/close buttons.
needs_dwm_frame_clear_ = false;
RECT client_rect;
GetClientRect(hwnd(), &client_rect);
base::win::ScopedGDIObject<HBRUSH> brush(CreateSolidBrush(0));
// The DC and GetClientRect operate in client area coordinates.
RECT rect = {0, 0, client_rect.right, insets.top()};
FillRect(dc, &rect, brush.get());
}
// 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 (delegate_->GetNativeViewAccessible()) {
bool is_uia_request = static_cast<DWORD>(UiaRootObjectId) == obj_id;
bool is_msaa_request = static_cast<DWORD>(OBJID_CLIENT) == obj_id;
// Expose either the UIA or the MSAA implementation, but not both, depending
// on the state of the feature flag.
if (is_uia_request &&
::switches::IsExperimentalAccessibilityPlatformUIAEnabled()) {
// Retrieve UIA object for the root view.
Microsoft::WRL::ComPtr<IRawElementProviderSimple> root;
delegate_->GetNativeViewAccessible()->QueryInterface(IID_PPV_ARGS(&root));
reference_result =
UiaReturnRawElementProvider(hwnd(), w_param, l_param, root.Detach());
} else if (is_msaa_request &&
!::switches::IsExperimentalAccessibilityPlatformUIAEnabled()) {
// Retrieve MSAA dispatch object for the root view.
Microsoft::WRL::ComPtr<IAccessible> root(
delegate_->GetNativeViewAccessible());
reference_result = LresultFromObject(
IID_IAccessible, w_param, static_cast<IAccessible*>(root.Detach()));
}
} else if (::GetFocus() == hwnd() && ax_system_caret_ &&
static_cast<DWORD>(OBJID_CARET) == obj_id) {
Microsoft::WRL::ComPtr<IAccessible> ax_system_caret_accessible =
ax_system_caret_->GetCaret();
reference_result = LresultFromObject(IID_IAccessible, w_param,
ax_system_caret_accessible.Detach());
}
return reference_result;
}
LRESULT HWNDMessageHandler::OnImeMessages(UINT message,
WPARAM w_param,
LPARAM l_param) {
LRESULT result = 0;
base::WeakPtr<HWNDMessageHandler> ref(msg_handler_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(msg_handler_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;
}
LRESULT HWNDMessageHandler::OnPointerEvent(UINT message,
WPARAM w_param,
LPARAM l_param) {
// WM_POINTER is not supported on Windows 7.
if (base::win::GetVersion() == base::win::VERSION_WIN7) {
SetMsgHandled(FALSE);
return -1;
}
UINT32 pointer_id = GET_POINTERID_WPARAM(w_param);
using GetPointerTypeFn = BOOL(WINAPI*)(UINT32, POINTER_INPUT_TYPE*);
POINTER_INPUT_TYPE pointer_type;
static GetPointerTypeFn get_pointer_type = reinterpret_cast<GetPointerTypeFn>(
GetProcAddress(GetModuleHandleA("user32.dll"), "GetPointerType"));
// If the WM_POINTER messages are not sent from a stylus device, then we do
// not handle them to make sure we do not change the current behavior of
// touch and mouse inputs.
if (!get_pointer_type || !get_pointer_type(pointer_id, &pointer_type)) {
SetMsgHandled(FALSE);
return -1;
}
switch (pointer_type) {
case PT_PEN:
return HandlePointerEventTypePen(message, w_param, l_param);
case PT_TOUCH:
if (pointer_events_for_touch_)
return HandlePointerEventTypeTouch(message, w_param, l_param);
FALLTHROUGH;
default:
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();
// Calling DefWindowProc is only necessary if there's a system frame being
// drawn. Otherwise it can draw an incorrect title bar and cause visual
// corruption.
if (!delegate_->HasFrame() ||
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;
}
}
RECT* client_rect =
mode ? &(reinterpret_cast<NCCALCSIZE_PARAMS*>(l_param)->rgrc[0])
: reinterpret_cast<RECT*>(l_param);
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 previous
// 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;
}
}
gfx::Insets insets;
bool got_insets = GetClientAreaInsets(&insets, monitor);
if (!got_insets && !IsFullscreen() && !(mode && !delegate_->HasFrame())) {
SetMsgHandled(FALSE);
return 0;
}
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.
const int autohide_edges = GetAppbarAutohideEdges(monitor);
if (autohide_edges & ViewsDelegate::EDGE_LEFT)
client_rect->left += kAutoHideTaskbarThicknessPx;
if (autohide_edges & ViewsDelegate::EDGE_TOP) {
if (IsFrameSystemDrawn()) {
// 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::OnNCCreate(LPCREATESTRUCT lpCreateStruct) {
SetMsgHandled(FALSE);
if (delegate_->HasFrame() && base::win::IsProcessPerMonitorDpiAware()) {
static auto enable_non_client_dpi_scaling_func = []() {
return reinterpret_cast<decltype(::EnableNonClientDpiScaling)*>(
GetProcAddress(GetModuleHandle(L"user32.dll"),
"EnableNonClientDpiScaling"));
}();
called_enable_non_client_dpi_scaling_ =
!!(enable_non_client_dpi_scaling_func &&
enable_non_client_dpi_scaling_func(hwnd()));
}
return FALSE;
}
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() &&
delegate_->GetFrameMode() != FrameMode::SYSTEM_DRAWN_NO_CONTROLS) {
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() || IsFrameSystemDrawn()) {
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) {
if (DidMinimizedChange(last_size_param_, param) && IsTopLevelWindow(hwnd()))
delegate_->HandleWindowMinimizedOrRestored(param != SIZE_MINIMIZED);
last_size_param_ = param;
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::OnSizing(UINT param, RECT* rect) {
// If the aspect ratio was not specified for the window, do nothing.
if (!aspect_ratio_.has_value())
return;
gfx::Rect window_rect(*rect);
SizeRectToAspectRatio(param, &window_rect);
// TODO(apacible): Account for window borders as part of the aspect ratio.
// https://crbug/869487.
*rect = window_rect.ToRECT();
}
void HWNDMessageHandler::OnSysCommand(UINT notification_code,
const gfx::Point& point) {
// 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;
const bool window_control_action =
(notification_code & sc_mask) == SC_MINIMIZE ||
(notification_code & sc_mask) == SC_MAXIMIZE ||
(notification_code & sc_mask) == SC_RESTORE;
const bool custom_controls_frame_mode =
delegate_->GetFrameMode() == FrameMode::SYSTEM_DRAWN_NO_CONTROLS ||
delegate_->GetFrameMode() == FrameMode::CUSTOM_DRAWN;
if (custom_controls_frame_mode && window_control_action)
delegate_->ResetWindowControls();
if (delegate_->GetFrameMode() == FrameMode::CUSTOM_DRAWN) {
const bool window_bounds_change =
(notification_code & sc_mask) == SC_MOVE ||
(notification_code & sc_mask) == SC_SIZE;
if (window_bounds_change || window_control_action)
DestroyAXSystemCaret();
if (window_bounds_change && !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 (delegate_->HandleCommand(notification_code))
return;
// If the delegate can't handle it, the system implementation will be called.
DefWindowProc(hwnd(), WM_SYSCOMMAND, notification_code,
MAKELPARAM(point.x(), point.y()));
}
void HWNDMessageHandler::OnThemeChanged() {
ui::NativeThemeWin::CloseHandles();
}
void HWNDMessageHandler::OnTimeChange() {
// Call NowFromSystemTime() to force base::Time to re-initialize the clock
// from system time. Otherwise base::Time::Now() might continue to reflect the
// old system clock for some amount of time. See https://crbug.com/672906#c5
base::Time::NowFromSystemTime();
}
LRESULT HWNDMessageHandler::OnTouchEvent(UINT message,
WPARAM w_param,
LPARAM l_param) {
if (pointer_events_for_touch_) {
// Release any associated memory with this event.
CloseTouchInputHandle(reinterpret_cast<HTOUCHINPUT>(l_param));
// Claim the event is handled. This shouldn't ever happen
// because we don't register touch windows when we are using
// pointer events.
return 0;
}
// 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;
TouchIDs stale_touches(touch_ids_);
for (int i = 0; i < num_points; ++i) {
stale_touches.erase(input[i].dwID);
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_or_pen_message_time_ = ::GetMessageTime();
gfx::Point touch_point(point.x, point.y);
size_t 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::BindOnce(&HWNDMessageHandler::ResetTouchDownContext,
msg_handler_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);
}
}
}
// If a touch has been dropped from the list (without a TOUCH_EVENTF_UP)
// we generate a simulated TOUCHEVENTF_UP event.
for (auto touch_number : stale_touches) {
// Log that we've hit this code. When usage drops off, we can remove
// this "workaround". See https://crbug.com/811273
UMA_HISTOGRAM_BOOLEAN("TouchScreen.MissedTOUCHEVENTF_UP", true);
size_t touch_id = id_generator_.GetGeneratedID(touch_number);
touch_ids_.erase(touch_number);
GenerateTouchEvent(ui::ET_TOUCH_RELEASED, gfx::Point(0, 0), touch_id,
event_time, &touch_events);
id_generator_.ReleaseNumber(touch_number);
}
// 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::BindOnce(&HWNDMessageHandler::HandleTouchEvents,
msg_handler_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;
const bool have_new_window_rect =
!(window_pos->flags & SWP_NOMOVE) && !(window_pos->flags & SWP_NOSIZE);
if (have_new_window_rect) {
// We should use new window rect for detecting monitor and it's
// parameters, if it is available. If we use |GetWindowRect()| instead,
// we can break our same monitor detection logic (see |same_monitor|
// below) and consequently Windows "Move to other monitor" shortcuts
// (Win+Shift+Arrows). See crbug.com/656001.
window_rect.left = window_pos->x;
window_rect.top = window_pos->y;
window_rect.right = window_pos->x + window_pos->cx - 1;
window_rect.bottom = window_pos->y + window_pos->cy - 1;
}
HMONITOR monitor;
gfx::Rect monitor_rect, work_area;
if ((have_new_window_rect || 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_);
const bool same_monitor = monitor && (monitor == last_monitor_);
gfx::Rect expected_maximized_bounds = work_area;
if (IsMaximized()) {
// Windows automatically adds a standard width border to all sides when
// window is maximized. We should take this into account.
gfx::Insets client_area_insets;
if (GetClientAreaInsets(&client_area_insets, monitor))
expected_maximized_bounds.Inset(client_area_insets.Scale(-1));
}
// Sometimes Windows incorrectly changes bounds of maximized windows after
// attaching or detaching additional displays. In this case user can see
// non-client area of the window (that should be hidden in normal case).
// We should restore window position if problem occurs.
const bool incorrect_maximized_bounds =