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chromium / chromium / refs/heads/trunk / . / ui / views / win / hwnd_message_handler.cc
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// 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 <shellapi.h>
#include "base/bind.h"
#include "base/system_monitor/system_monitor.h"
#include "base/win/windows_version.h"
#include "ui/base/events/event.h"
#include "ui/base/keycodes/keyboard_code_conversion_win.h"
#include "ui/base/native_theme/native_theme_win.h"
#include "ui/base/win/hwnd_util.h"
#include "ui/base/win/mouse_wheel_util.h"
#include "ui/base/win/shell.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/canvas_paint.h"
#include "ui/gfx/canvas_skia_paint.h"
#include "ui/gfx/icon_util.h"
#include "ui/gfx/insets.h"
#include "ui/gfx/path.h"
#include "ui/gfx/path_win.h"
#include "ui/gfx/screen.h"
#include "ui/views/views_delegate.h"
#include "ui/views/widget/monitor_win.h"
#include "ui/views/widget/native_widget_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"
#if !defined(USE_AURA)
#include "ui/views/accessibility/native_view_accessibility_win.h"
#include "ui/views/widget/child_window_message_processor.h"
#endif
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:
explicit MoveLoopMouseWatcher(HWNDMessageHandler* host);
~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_;
// 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)
: host_(host),
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) {
if (base::win::GetVersion() >= base::win::VERSION_VISTA) {
int value = TRUE;
HRESULT result = DwmSetWindowAttribute(
instance_->host_->hwnd(),
DWMWA_TRANSITIONS_FORCEDISABLED,
&value,
sizeof(value));
}
// Hide the window on escape, otherwise the window is visibly going to snap
// back to the original location before we close it.
// This behavior is specific to tab dragging, in that we generally wouldn't
// want this functionality if we have other consumers using this API.
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 = monitor_info.rcMonitor;
*work_area = monitor_info.rcWork;
return true;
}
struct FindOwnedWindowsData {
HWND window;
std::vector<Widget*> owned_widgets;
};
BOOL CALLBACK FindOwnedWindowsCallback(HWND hwnd, LPARAM param) {
// TODO(beng): resolve wrt aura.
#if !defined(USE_AURA)
FindOwnedWindowsData* data = reinterpret_cast<FindOwnedWindowsData*>(param);
if (GetWindow(hwnd, GW_OWNER) == data->window) {
Widget* widget = Widget::GetWidgetForNativeView(hwnd);
if (widget)
data->owned_widgets.push_back(widget);
}
#endif
return TRUE;
}
// 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;
}
// See comments in OnNCPaint() for details of this struct.
struct ClipState {
// The window being painted.
HWND parent;
// DC painting to.
HDC dc;
// Origin of the window in terms of the screen.
int x;
int y;
};
// See comments in OnNCPaint() for details of this function.
static BOOL CALLBACK ClipDCToChild(HWND window, LPARAM param) {
ClipState* clip_state = reinterpret_cast<ClipState*>(param);
if (GetParent(window) == clip_state->parent && IsWindowVisible(window)) {
RECT bounds;
GetWindowRect(window, &bounds);
ExcludeClipRect(clip_state->dc,
bounds.left - clip_state->x,
bounds.top - clip_state->y,
bounds.right - clip_state->x,
bounds.bottom - clip_state->y);
}
return TRUE;
}
#if !defined(USE_AURA)
// Get the source HWND of the specified message. Depending on the message, the
// source HWND is encoded in either the WPARAM or the LPARAM value.
HWND GetControlHWNDForMessage(UINT message, WPARAM w_param, LPARAM l_param) {
// Each of the following messages can be sent by a child HWND and must be
// forwarded to its associated NativeControlWin for handling.
switch (message) {
case WM_NOTIFY:
return reinterpret_cast<NMHDR*>(l_param)->hwndFrom;
case WM_COMMAND:
return reinterpret_cast<HWND>(l_param);
case WM_CONTEXTMENU:
return reinterpret_cast<HWND>(w_param);
case WM_CTLCOLORBTN:
case WM_CTLCOLORSTATIC:
return reinterpret_cast<HWND>(l_param);
}
return NULL;
}
// Some messages may be sent to us by a child HWND. If this is the case, this
// function will forward those messages on to the object associated with the
// source HWND and return true, in which case the window procedure must not do
// any further processing of the message. If there is no associated
// ChildWindowMessageProcessor, the return value will be false and the WndProc
// can continue processing the message normally. |l_result| contains the result
// of the message processing by the control and must be returned by the WndProc
// if the return value is true.
bool ProcessChildWindowMessage(UINT message,
WPARAM w_param,
LPARAM l_param,
LRESULT* l_result) {
*l_result = 0;
HWND control_hwnd = GetControlHWNDForMessage(message, w_param, l_param);
if (IsWindow(control_hwnd)) {
ChildWindowMessageProcessor* processor =
ChildWindowMessageProcessor::Get(control_hwnd);
if (processor)
return processor->ProcessMessage(message, w_param, l_param, l_result);
}
return false;
}
#endif
// A custom MSAA object id used to determine if a screen reader is actively
// listening for MSAA events.
const int kCustomObjectID = 1;
// The thickness of an auto-hide taskbar in pixels.
const int kAutoHideTaskbarThicknessPx = 2;
} // 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);
};
////////////////////////////////////////////////////////////////////////////////
// HWNDMessageHandler, public:
HWNDMessageHandler::HWNDMessageHandler(HWNDMessageHandlerDelegate* delegate)
: delegate_(delegate),
ALLOW_THIS_IN_INITIALIZER_LIST(
fullscreen_handler_(new FullscreenHandler)),
ALLOW_THIS_IN_INITIALIZER_LIST(close_widget_factory_(this)),
remove_standard_frame_(false),
restore_focus_when_enabled_(false),
restored_enabled_(false),
previous_cursor_(NULL),
active_mouse_tracking_flags_(0),
is_right_mouse_pressed_on_caption_(false),
lock_updates_count_(0),
destroyed_(NULL),
ignore_window_pos_changes_(false),
ALLOW_THIS_IN_INITIALIZER_LIST(ignore_pos_changes_factory_(this)),
last_monitor_(NULL),
use_layered_buffer_(false),
layered_alpha_(255),
ALLOW_THIS_IN_INITIALIZER_LIST(paint_layered_window_factory_(this)),
can_update_layered_window_(true) {
}
HWNDMessageHandler::~HWNDMessageHandler() {
delegate_ = NULL;
if (destroyed_ != NULL)
*destroyed_ = true;
// Prevent calls back into this class via WNDPROC now that we've been
// destroyed.
ClearUserData();
}
void HWNDMessageHandler::Init(HWND parent, const gfx::Rect& bounds) {
GetMonitorAndRects(bounds.ToRECT(), &last_monitor_, &last_monitor_rect_,
&last_work_area_);
// Create the window.
WindowImpl::Init(parent, bounds);
}
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();
if (!close_widget_factory_.HasWeakPtrs()) {
// 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).
MessageLoop::current()->PostTask(
FROM_HERE,
base::Bind(&HWNDMessageHandler::CloseNow,
close_widget_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.
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 (fullscreen_handler_->fullscreen())
return fullscreen_handler_->GetRestoreBounds();
gfx::Rect bounds;
GetWindowPlacement(&bounds, NULL);
return bounds;
}
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) {
LONG style = GetWindowLong(hwnd(), GWL_STYLE);
if (style & WS_MAXIMIZE)
SetWindowLong(hwnd(), GWL_STYLE, style & ~WS_MAXIMIZE);
SetWindowPos(hwnd(), NULL, bounds.x(), bounds.y(), bounds.width(),
bounds.height(), SWP_NOACTIVATE | SWP_NOZORDER);
}
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);
ui::CenterAndSizeWindow(parent, hwnd(), size);
}
void HWNDMessageHandler::SetRegion(HRGN region) {
SetWindowRgn(hwnd(), region, TRUE);
}
void HWNDMessageHandler::StackAbove(HWND other_hwnd) {
SetWindowPos(hwnd(), other_hwnd, 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() {
// TODO(beng): Seems like this could just be rewritten as
// ShowWindowWithState(SW_SHOWNOACTIVATE).
if (!IsWindow(hwnd()))
return;
ShowWindow(hwnd(), SW_SHOWNOACTIVATE);
SetInitialFocus();
}
void HWNDMessageHandler::ShowWindowWithState(ui::WindowShowState show_state) {
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;
default:
native_show_state = delegate_->GetInitialShowState();
break;
}
Show(native_show_state);
}
void HWNDMessageHandler::Show(int show_state) {
ShowWindow(hwnd(), 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 (show_state == SW_HIDE) {
show_state = SW_SHOWNORMAL;
ShowWindow(hwnd(), 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 (show_state == SW_SHOWNORMAL || show_state == SW_SHOWMAXIMIZED)
Activate();
if (!delegate_->HandleInitialFocus())
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);
}
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);
if (!GetParent(hwnd()))
NotifyOwnedWindowsParentClosing();
}
}
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);
if (next_hwnd)
::SetForegroundWindow(next_hwnd);
}
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());
}
bool HWNDMessageHandler::RunMoveLoop(const gfx::Point& drag_offset) {
ReleaseCapture();
MoveLoopMouseWatcher watcher(this);
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 = 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() {
::ReleaseCapture();
}
bool HWNDMessageHandler::HasCapture() const {
return ::GetCapture() == hwnd();
}
void HWNDMessageHandler::SetVisibilityChangedAnimationsEnabled(bool enabled) {
if (base::win::GetVersion() >= base::win::VERSION_VISTA) {
int dwm_value = enabled ? FALSE : TRUE;
DwmSetWindowAttribute(
hwnd(), DWMWA_TRANSITIONS_FORCEDISABLED, &dwm_value, sizeof(dwm_value));
}
}
void HWNDMessageHandler::SetTitle(const string16& title) {
SetWindowText(hwnd(), title.c_str());
SetAccessibleName(title);
}
void HWNDMessageHandler::SetAccessibleName(const string16& name) {
// TODO(beng): figure out vis-a-vis aura.
#if !defined(USE_AURA)
base::win::ScopedComPtr<IAccPropServices> pAccPropServices;
HRESULT hr = CoCreateInstance(CLSID_AccPropServices, NULL, CLSCTX_SERVER,
IID_IAccPropServices, reinterpret_cast<void**>(&pAccPropServices));
if (SUCCEEDED(hr))
hr = pAccPropServices->SetHwndPropStr(hwnd(), OBJID_CLIENT, CHILDID_SELF,
PROPID_ACC_NAME, name.c_str());
#endif
}
void HWNDMessageHandler::SetAccessibleRole(ui::AccessibilityTypes::Role role) {
// TODO(beng): figure out vis-a-vis aura.
#if !defined(USE_AURA)
base::win::ScopedComPtr<IAccPropServices> pAccPropServices;
HRESULT hr = CoCreateInstance(CLSID_AccPropServices, NULL, CLSCTX_SERVER,
IID_IAccPropServices, reinterpret_cast<void**>(&pAccPropServices));
if (SUCCEEDED(hr)) {
VARIANT var;
if (role) {
var.vt = VT_I4;
var.lVal = NativeViewAccessibilityWin::MSAARole(role);
hr = pAccPropServices->SetHwndProp(hwnd(), OBJID_CLIENT, CHILDID_SELF,
PROPID_ACC_ROLE, var);
}
}
#endif
}
void HWNDMessageHandler::SetAccessibleState(
ui::AccessibilityTypes::State state) {
// TODO(beng): figure out vis-a-vis aura.
#if !defined(USE_AURA)
base::win::ScopedComPtr<IAccPropServices> pAccPropServices;
HRESULT hr = CoCreateInstance(CLSID_AccPropServices, NULL, CLSCTX_SERVER,
IID_IAccPropServices, reinterpret_cast<void**>(&pAccPropServices));
if (SUCCEEDED(hr)) {
VARIANT var;
if (state) {
var.vt = VT_I4;
var.lVal = NativeViewAccessibilityWin::MSAAState(state);
hr = pAccPropServices->SetHwndProp(hwnd(), OBJID_CLIENT, CHILDID_SELF,
PROPID_ACC_STATE, var);
}
}
#endif
}
void HWNDMessageHandler::SendNativeAccessibilityEvent(
int id,
ui::AccessibilityTypes::Event event_type) {
// TODO(beng): figure out vis-a-vis aura.
#if !defined(USE_AURA)
// Now call the Windows-specific method to notify MSAA clients of this
// event. The widget gives us a temporary unique child ID to associate
// with this view so that clients can call get_accChild in
// NativeViewAccessibilityWin to retrieve the IAccessible associated
// with this view.
::NotifyWinEvent(NativeViewAccessibilityWin::MSAAEvent(event_type), hwnd(),
OBJID_CLIENT, id);
#endif
}
void HWNDMessageHandler::SetCursor(HCURSOR cursor) {
if (cursor) {
previous_cursor_ = ::SetCursor(cursor);
} else if (previous_cursor_) {
::SetCursor(previous_cursor_);
previous_cursor_ = NULL;
}
}
void HWNDMessageHandler::FrameTypeChanged() {
// Called when the frame type could possibly be changing (theme change or
// DWM composition change).
if (base::win::GetVersion() >= base::win::VERSION_VISTA) {
// We need to toggle the rendering policy of the DWM/glass frame as we
// change from opaque to glass. "Non client rendering enabled" means that
// the DWM's glass non-client rendering is enabled, which is why
// DWMNCRP_ENABLED is used for the native frame case. _DISABLED means the
// DWM doesn't render glass, and so is used in the custom frame case.
DWMNCRENDERINGPOLICY policy = !delegate_->IsUsingCustomFrame() ?
DWMNCRP_ENABLED : DWMNCRP_DISABLED;
DwmSetWindowAttribute(hwnd(), DWMWA_NCRENDERING_POLICY,
&policy, sizeof(DWMNCRENDERINGPOLICY));
}
ResetWindowRegion(true);
// The non-client view needs to update too.
delegate_->HandleFrameChanged();
// 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::SchedulePaintInRect(const gfx::Rect& rect) {
if (use_layered_buffer_) {
// We must update the back-buffer immediately, since Windows' handling of
// invalid rects is somewhat mysterious.
invalid_rect_ = invalid_rect_.Union(rect);
// In some situations, such as drag and drop, when Windows itself runs a
// nested message loop our message loop appears to be starved and we don't
// receive calls to DidProcessMessage(). This only seems to affect layered
// windows, so we schedule a redraw manually using a task, since those never
// seem to be starved. Also, wtf.
if (!paint_layered_window_factory_.HasWeakPtrs()) {
MessageLoop::current()->PostTask(
FROM_HERE,
base::Bind(&HWNDMessageHandler::RedrawLayeredWindowContents,
paint_layered_window_factory_.GetWeakPtr()));
}
} else {
// InvalidateRect() expects client coordinates.
RECT r = rect.ToRECT();
InvalidateRect(hwnd(), &r, FALSE);
}
}
void HWNDMessageHandler::SetOpacity(BYTE opacity) {
layered_alpha_ = opacity;
}
void HWNDMessageHandler::SetWindowIcons(const gfx::ImageSkia& window_icon,
const gfx::ImageSkia& app_icon) {
if (!window_icon.isNull()) {
HICON windows_icon = IconUtil::CreateHICONFromSkBitmap(window_icon);
// We need to make sure to destroy the previous icon, otherwise we'll leak
// these GDI objects until we crash!
HICON old_icon = reinterpret_cast<HICON>(
SendMessage(hwnd(), WM_SETICON, ICON_SMALL,
reinterpret_cast<LPARAM>(windows_icon)));
if (old_icon)
DestroyIcon(old_icon);
}
if (!app_icon.isNull()) {
HICON windows_icon = IconUtil::CreateHICONFromSkBitmap(app_icon);
HICON old_icon = reinterpret_cast<HICON>(
SendMessage(hwnd(), WM_SETICON, ICON_BIG,
reinterpret_cast<LPARAM>(windows_icon)));
if (old_icon)
DestroyIcon(old_icon);
}
}
////////////////////////////////////////////////////////////////////////////////
// HWNDMessageHandler, InputMethodDelegate implementation:
void HWNDMessageHandler::DispatchKeyEventPostIME(const ui::KeyEvent& key) {
SetMsgHandled(delegate_->HandleKeyEvent(key));
}
////////////////////////////////////////////////////////////////////////////////
// HWNDMessageHandler, ui::WindowImpl overrides:
HICON HWNDMessageHandler::GetDefaultWindowIcon() const {
if (use_sytem_default_icon_)
return NULL;
return ViewsDelegate::views_delegate ?
ViewsDelegate::views_delegate->GetDefaultWindowIcon() : NULL;
}
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;
#if !defined(USE_AURA)
// First allow messages sent by child controls to be processed directly by
// their associated views. If such a view is present, it will handle the
// message *instead of* this NativeWidgetWin.
if (ProcessChildWindowMessage(message, w_param, l_param, &result))
return result;
#endif
// Otherwise we handle everything else.
if (!ProcessWindowMessage(window, message, w_param, l_param, result))
result = DefWindowProc(window, message, w_param, l_param);
// DefWindowProc() may have destroyed the window in a nested message loop.
if (!::IsWindow(window))
return result;
if (delegate_)
delegate_->PostHandleMSG(message, w_param, l_param);
if (message == WM_NCDESTROY) {
MessageLoopForUI::current()->RemoveObserver(this);
if (delegate_)
delegate_->HandleDestroyed();
}
// Only top level widget should store/restore focus.
if (message == WM_ACTIVATE && delegate_->CanSaveFocus())
PostProcessActivateMessage(LOWORD(w_param));
if (message == WM_ENABLE && restore_focus_when_enabled_) {
// This path should be executed only for top level as
// restore_focus_when_enabled_ is set in PostProcessActivateMessage.
DCHECK(delegate_->CanSaveFocus());
restore_focus_when_enabled_ = false;
delegate_->RestoreFocusOnEnable();
}
return result;
}
////////////////////////////////////////////////////////////////////////////////
// HWNDMessageHandler, MessageLoopForUI::Observer implementation:
base::EventStatus HWNDMessageHandler::WillProcessEvent(
const base::NativeEvent& event) {
return base::EVENT_CONTINUE;
}
void HWNDMessageHandler::DidProcessEvent(const base::NativeEvent& event) {
RedrawInvalidRect();
}
////////////////////////////////////////////////////////////////////////////////
// HWNDMessageHandler, private:
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) {
DCHECK(delegate_->CanSaveFocus());
if (WA_INACTIVE == activation_state) {
// We might get activated/inactivated without being enabled, so we need to
// clear restore_focus_when_enabled_.
restore_focus_when_enabled_ = false;
delegate_->SaveFocusOnDeactivate();
} else {
// We must restore the focus after the message has been DefProc'ed as it
// does set the focus to the last focused HWND.
// Note that if the window is not enabled, we cannot restore the focus as
// calling ::SetFocus on a child of the non-enabled top-window would fail.
// This is the case when showing a modal dialog (such as 'open file',
// 'print'...) from a different thread.
// In that case we delay the focus restoration to when the window is enabled
// again.
if (!IsWindowEnabled(hwnd())) {
DCHECK(!restore_focus_when_enabled_);
restore_focus_when_enabled_ = true;
return;
}
delegate_->RestoreFocusOnActivate();
}
}
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() {
RECT r = {0, 0, 0, 0};
if (delegate_->WidgetSizeIsClientSize()) {
// TODO(beng): investigate whether this could be done
// from other branch of if-else.
if (!IsMinimized())
GetClientRect(hwnd(), &r);
} else {
GetWindowRect(hwnd(), &r);
}
gfx::Size s(std::max(0, static_cast<int>(r.right - r.left)),
std::max(0, static_cast<int>(r.bottom - r.top)));
delegate_->HandleClientSizeChanged(s);
if (use_layered_buffer_) {
layered_window_contents_.reset(
new gfx::Canvas(s, ui::SCALE_FACTOR_100P, false));
}
}
gfx::Insets HWNDMessageHandler::GetClientAreaInsets() const {
gfx::Insets insets;
if (delegate_->GetClientAreaInsets(&insets))
return insets;
DCHECK(insets.empty());
// Returning an empty Insets object causes the default handling in
// NativeWidgetWin::OnNCCalcSize() to be invoked.
if (!delegate_->IsWidgetWindow() ||
(!delegate_->IsUsingCustomFrame() && !remove_standard_frame_)) {
return insets;
}
if (IsMaximized()) {
// Windows automatically adds a standard width border to all sides when a
// window is maximized.
int border_thickness = GetSystemMetrics(SM_CXSIZEFRAME);
return gfx::Insets(border_thickness, border_thickness, border_thickness,
border_thickness);
}
// The hack below doesn't seem to be necessary when the standard frame is
// removed.
if (remove_standard_frame_)
return insets;
// This is weird, but highly essential. If we don't offset the bottom edge
// of the client rect, the window client area and window area will match,
// and when returning to glass rendering mode from non-glass, the client
// area will not paint black as transparent. This is because (and I don't
// know why) the client area goes from matching the window rect to being
// something else. If the client area is not the window rect in both
// modes, the blackness doesn't occur. Because of this, we need to tell
// the RootView to lay out to fit the window rect, rather than the client
// rect when using the opaque frame.
// Note: this is only required for non-fullscreen windows. Note that
// fullscreen windows are in restored state, not maximized.
return gfx::Insets(0, 0, fullscreen_handler_->fullscreen() ? 0 : 1, 0);
}
void HWNDMessageHandler::ResetWindowRegion(bool force) {
// A native frame uses the native window region, and we don't want to mess
// with it.
if (!delegate_->IsUsingCustomFrame() || !delegate_->IsWidgetWindow()) {
if (force)
SetWindowRgn(hwnd(), NULL, TRUE);
return;
}
// Changing the window region is going to force a paint. Only change the
// window region if the region really differs.
HRGN current_rgn = CreateRectRgn(0, 0, 0, 0);
int current_rgn_result = GetWindowRgn(hwnd(), current_rgn);
CRect window_rect;
GetWindowRect(hwnd(), &window_rect);
HRGN new_region;
if (IsMaximized()) {
HMONITOR monitor = MonitorFromWindow(hwnd(), MONITOR_DEFAULTTONEAREST);
MONITORINFO mi;
mi.cbSize = sizeof mi;
GetMonitorInfo(monitor, &mi);
CRect work_rect = mi.rcWork;
work_rect.OffsetRect(-window_rect.left, -window_rect.top);
new_region = CreateRectRgnIndirect(&work_rect);
} else {
gfx::Path window_mask;
delegate_->GetWindowMask(
gfx::Size(window_rect.Width(), window_rect.Height()), &window_mask);
new_region = gfx::CreateHRGNFromSkPath(window_mask);
}
if (current_rgn_result == ERROR || !EqualRgn(current_rgn, new_region)) {
// SetWindowRgn takes ownership of the HRGN created by CreateNativeRegion.
SetWindowRgn(hwnd(), new_region, TRUE);
} else {
DeleteObject(new_region);
}
DeleteObject(current_rgn);
}
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 |destroyed_| flag to avoid unlocking (and crashing) after destruction.
bool destroyed = false;
destroyed_ = &destroyed;
LRESULT result = DefWindowProc(hwnd(), message, w_param, l_param);
if (destroyed)
lock.CancelUnlockOperation();
else
destroyed_ = NULL;
return result;
}
void HWNDMessageHandler::NotifyOwnedWindowsParentClosing() {
FindOwnedWindowsData data;
data.window = hwnd();
EnumThreadWindows(GetCurrentThreadId(), FindOwnedWindowsCallback,
reinterpret_cast<LPARAM>(&data));
for (size_t i = 0; i < data.owned_widgets.size(); ++i)
data.owned_widgets[i]->OnOwnerClosing();
}
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::RedrawInvalidRect() {
if (!use_layered_buffer_) {
RECT r = { 0, 0, 0, 0 };
if (GetUpdateRect(hwnd(), &r, FALSE) && !IsRectEmpty(&r)) {
RedrawWindow(hwnd(), &r, NULL,
RDW_INVALIDATE | RDW_UPDATENOW | RDW_NOCHILDREN);
}
}
}
void HWNDMessageHandler::RedrawLayeredWindowContents() {
if (invalid_rect_.IsEmpty())
return;
// We need to clip to the dirty rect ourselves.
layered_window_contents_->sk_canvas()->save(SkCanvas::kClip_SaveFlag);
layered_window_contents_->ClipRect(invalid_rect_);
delegate_->PaintLayeredWindow(layered_window_contents_.get());
layered_window_contents_->sk_canvas()->restore();
RECT wr;
GetWindowRect(hwnd(), &wr);
SIZE size = {wr.right - wr.left, wr.bottom - wr.top};
POINT position = {wr.left, wr.top};
HDC dib_dc = skia::BeginPlatformPaint(layered_window_contents_->sk_canvas());
POINT zero = {0, 0};
BLENDFUNCTION blend = {AC_SRC_OVER, 0, layered_alpha_, AC_SRC_ALPHA};
UpdateLayeredWindow(hwnd(), NULL, &position, &size, dib_dc, &zero,
RGB(0xFF, 0xFF, 0xFF), &blend, ULW_ALPHA);
invalid_rect_.SetRect(0, 0, 0, 0);
skia::EndPlatformPaint(layered_window_contents_->sk_canvas());
}
// Message handlers ------------------------------------------------------------
void HWNDMessageHandler::OnActivateApp(BOOL active, DWORD thread_id) {
if (delegate_->IsWidgetWindow() && !active &&
thread_id != GetCurrentThreadId()) {
delegate_->HandleAppDeactivated();
// Also update the native frame if it is rendering the non-client area.
if (!remove_standard_frame_ && !delegate_->IsUsingCustomFrame())
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::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) {
use_layered_buffer_ = !!(window_ex_style() & WS_EX_LAYERED);
fullscreen_handler_->set_hwnd(hwnd());
// Attempt to detect screen readers by sending an event with our custom id.
NotifyWinEvent(EVENT_SYSTEM_ALERT, hwnd(), kCustomObjectID, CHILDID_SELF);
// This message initializes the window so that focus border are shown for
// windows.
SendMessage(hwnd(),
WM_CHANGEUISTATE,
MAKELPARAM(UIS_CLEAR, UISF_HIDEFOCUS),
0);
// Bug 964884: detach the IME attached to this window.
// We should attach IMEs only when we need to input CJK strings.
ImmAssociateContextEx(hwnd(), NULL, 0);
if (remove_standard_frame_) {
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 (base::win::GetVersion() >= base::win::VERSION_WIN7)
RegisterTouchWindow(hwnd(), 0);
// 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();
// We need to add ourselves as a message loop observer so that we can repaint
// aggressively if the contents of our window become invalid. Unfortunately
// WM_PAINT messages are starved and we get flickery redrawing when resizing
// if we do not do this.
MessageLoopForUI::current()->AddObserver(this);
delegate_->HandleCreate();
// TODO(beng): move more of NWW::OnCreate here.
return 0;
}
void HWNDMessageHandler::OnDestroy() {
delegate_->HandleDestroying();
}
void HWNDMessageHandler::OnDisplayChange(UINT bits_per_pixel,
const CSize& screen_size) {
delegate_->HandleDisplayChange();
}
LRESULT HWNDMessageHandler::OnDwmCompositionChanged(UINT msg,
WPARAM w_param,
LPARAM l_param) {
if (!delegate_->IsWidgetWindow()) {
SetMsgHandled(FALSE);
return 0;
}
// For some reason, we need to hide the window while we're changing the frame
// type only when we're changing it in response to WM_DWMCOMPOSITIONCHANGED.
// If we don't, the client area will be filled with black. I'm suspecting
// something skia-ey.
// Frame type toggling caused by the user (e.g. switching theme) doesn't seem
// to have this requirement.
FrameTypeChanged();
return 0;
}
void HWNDMessageHandler::OnEnterSizeMove() {
delegate_->HandleBeginWMSizeMove();
SetMsgHandled(FALSE);
}
LRESULT HWNDMessageHandler::OnEraseBkgnd(HDC dc) {
// Needed to prevent resize flicker.
return 1;
}
void HWNDMessageHandler::OnExitSizeMove() {
delegate_->HandleEndWMSizeMove();
SetMsgHandled(FALSE);
}
void HWNDMessageHandler::OnGetMinMaxInfo(MINMAXINFO* minmax_info) {
gfx::Size min_window_size;
gfx::Size max_window_size;
delegate_->GetMinMaxSize(&min_window_size, &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()) {
CRect client_rect, window_rect;
GetClientRect(hwnd(), &client_rect);
GetWindowRect(hwnd(), &window_rect);
window_rect -= client_rect;
min_window_size.Enlarge(window_rect.Width(), window_rect.Height());
if (!max_window_size.IsEmpty())
max_window_size.Enlarge(window_rect.Width(), window_rect.Height());
}
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);
// Accessibility readers will send an OBJID_CLIENT message
if (OBJID_CLIENT == l_param) {
// 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()));
}
if (kCustomObjectID == l_param) {
// An MSAA client requested our custom id. Assume that we have detected an
// active windows screen reader.
delegate_->HandleScreenReaderDetected();
// Return with failure.
return static_cast<LRESULT>(0L);
}
return reference_result;
}
LRESULT HWNDMessageHandler::OnImeMessages(UINT message,
WPARAM w_param,
LPARAM l_param) {
LRESULT result = 0;
SetMsgHandled(delegate_->HandleIMEMessage(
message, w_param, l_param, &result));
return result;
}
void HWNDMessageHandler::OnInitMenu(HMENU menu) {
bool is_fullscreen = fullscreen_handler_->fullscreen();
bool is_minimized = IsMinimized();
bool is_maximized = IsMaximized();
bool is_restored = !is_fullscreen && !is_minimized && !is_maximized;
ScopedRedrawLock lock(this);
EnableMenuItemByCommand(menu, SC_RESTORE, 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_->CanMaximize() &&
!is_minimized);
}
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 };
ui::KeyEvent key(msg, message == WM_CHAR);
if (!delegate_->HandleUntranslatedKeyEvent(key))
DispatchKeyEventPostIME(key);
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) {
// TODO(beng): resolve this with the GetWindowLong() check on the subsequent
// line.
if (delegate_->IsWidgetWindow())
return delegate_->CanActivate() ? MA_ACTIVATE : 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) {
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.
CPoint screen_point(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) {
ui::ShowSystemMenu(hwnd(), screen_point.x, screen_point.y);
return 0;
}
} else if (message == WM_NCLBUTTONDOWN && delegate_->IsUsingCustomFrame()) {
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 |= base::win::IsCtrlPressed() ? MK_CONTROL : 0;
w_param |= base::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();
}
MSG msg = { hwnd(), message, w_param, l_param, 0,
{ GET_X_LPARAM(l_param), GET_Y_LPARAM(l_param) } };
ui::MouseEvent event(msg);
if (!touch_ids_.empty() || ui::IsMouseEventFromTouch(message))
event.set_flags(event.flags() | ui::EF_FROM_TOUCH);
if (!(event.flags() & ui::EF_IS_NON_CLIENT))
delegate_->HandleTooltipMouseMove(message, w_param, l_param);
if (event.type() == ui::ET_MOUSE_MOVED && !HasCapture()) {
// 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
// NativeWidgetWin 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;
}
bool handled = delegate_->HandleMouseEvent(event);
if (!handled && message == WM_NCLBUTTONDOWN && w_param != HTSYSMENU &&
delegate_->IsUsingCustomFrame()) {
// 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;
}
SetMsgHandled(handled);
return 0;
}
void HWNDMessageHandler::OnMove(const CPoint& point) {
delegate_->HandleMove();
SetMsgHandled(FALSE);
}
void HWNDMessageHandler::OnMoving(UINT param, const RECT* new_bounds) {
delegate_->HandleMove();
}
LRESULT HWNDMessageHandler::OnNCActivate(BOOL active) {
if (delegate_->CanActivate())
delegate_->HandleActivationChanged(!!active);
if (!delegate_->IsWidgetWindow()) {
SetMsgHandled(FALSE);
return 0;
}
if (!delegate_->CanActivate())
return TRUE;
// 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_->IsUsingCustomFrame()) {
// 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);
}
// If we're active again, we should be allowed to render as inactive, so
// tell the non-client view.
bool inactive_rendering_disabled = delegate_->IsInactiveRenderingDisabled();
if (IsActive())
delegate_->EnableInactiveRendering();
// Avoid DefWindowProc non-client rendering over our custom frame on newer
// Windows versions only (breaks taskbar activation indication on XP/Vista).
if (delegate_->IsUsingCustomFrame() &&
base::win::GetVersion() > base::win::VERSION_VISTA) {
SetMsgHandled(TRUE);
return TRUE;
}
return DefWindowProcWithRedrawLock(
WM_NCACTIVATE, inactive_rendering_disabled || 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.
gfx::Insets insets = GetClientAreaInsets();
if (insets.empty() && !fullscreen_handler_->fullscreen() &&
!(mode && remove_standard_frame_)) {
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;
}
}
if (GetTopmostAutoHideTaskbarForEdge(ABE_LEFT, monitor))
client_rect->left += kAutoHideTaskbarThicknessPx;
if (GetTopmostAutoHideTaskbarForEdge(ABE_TOP, monitor)) {
if (!delegate_->IsUsingCustomFrame()) {
// 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 (GetTopmostAutoHideTaskbarForEdge(ABE_RIGHT, monitor))
client_rect->right -= kAutoHideTaskbarThicknessPx;
if (GetTopmostAutoHideTaskbarForEdge(ABE_BOTTOM, monitor))
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 CPoint& point) {
if (!delegate_->IsWidgetWindow()) {
SetMsgHandled(FALSE);
return 0;
}
// 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 (!remove_standard_frame_ && !delegate_->IsUsingCustomFrame()) {
LRESULT result;
if (DwmDefWindowProc(hwnd(), WM_NCHITTEST, 0,
MAKELPARAM(point.x, point.y), &result)) {
return result;
}
}
// First, give the NonClientView a chance to test the point to see if it
// provides any of the non-client area.
POINT temp = point;
MapWindowPoints(HWND_DESKTOP, hwnd(), &temp, 1);
int component = delegate_->GetNonClientComponent(gfx::Point(temp));
if (component != HTNOWHERE)
return component;
// Otherwise, we let Windows do all the native frame non-client handling for
// us.
SetMsgHandled(FALSE);
return 0;
}
void HWNDMessageHandler::OnNCPaint(HRGN rgn) {
// We only do non-client painting if we're not using the native frame.
// It's required to avoid some native painting artifacts from appearing when
// the window is resized.
if (!delegate_->IsWidgetWindow() || !delegate_->IsUsingCustomFrame()) {
SetMsgHandled(FALSE);
return;
}
// We have an NC region and need to paint it. We expand the NC region to
// include the dirty region of the root view. This is done to minimize
// paints.
CRect window_rect;
GetWindowRect(hwnd(), &window_rect);
gfx::Size root_view_size = delegate_->GetRootViewSize();
if (gfx::Size(window_rect.Width(), window_rect.Height()) != 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;
}
CRect dirty_region;
// A value of 1 indicates paint all.
if (!rgn || rgn == reinterpret_cast<HRGN>(1)) {
dirty_region = CRect(0, 0, window_rect.Width(), window_rect.Height());
} else {
RECT rgn_bounding_box;
GetRgnBox(rgn, &rgn_bounding_box);
if (!IntersectRect(&dirty_region, &rgn_bounding_box, &window_rect))
return; // Dirty region doesn't intersect window bounds, bale.
// rgn_bounding_box is in screen coordinates. Map it to window coordinates.
OffsetRect(&dirty_region, -window_rect.left, -window_rect.top);
}
// In theory GetDCEx should do what we want, but I couldn't get it to work.
// In particular the docs mentiond DCX_CLIPCHILDREN, but as far as I can tell
// it doesn't work at all. So, instead we get the DC for the window then
// manually clip out the children.
HDC dc = GetWindowDC(hwnd());
ClipState clip_state;
clip_state.x = window_rect.left;
clip_state.y = window_rect.top;
clip_state.parent = hwnd();
clip_state.dc = dc;
EnumChildWindows(hwnd(), &ClipDCToChild,
reinterpret_cast<LPARAM>(&clip_state));
gfx::Rect old_paint_region = invalid_rect_;
if (!old_paint_region.IsEmpty()) {
// The root view has a region that needs to be painted. Include it in the
// region we're going to paint.
CRect old_paint_region_crect = old_paint_region.ToRECT();
CRect tmp = dirty_region;
UnionRect(&dirty_region, &tmp, &old_paint_region_crect);
}
SchedulePaintInRect(gfx::Rect(dirty_region));
// gfx::CanvasSkiaPaint's destructor does the actual painting. As such, wrap
// the following in a block to force paint to occur so that we can release
// the dc.
{
gfx::CanvasSkiaPaint canvas(dc, true, dirty_region.left,
dirty_region.top, dirty_region.Width(),
dirty_region.Height());
delegate_->HandlePaint(&canvas);
}
ReleaseDC(hwnd(), dc);
// When using a custom frame, we want to avoid calling DefWindowProc() since
// that may render artifacts.
SetMsgHandled(delegate_->IsUsingCustomFrame());
}
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_->IsUsingCustomFrame());
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_->IsUsingCustomFrame());
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) {
#if defined(USE_AURA)
// All aura painting is accelerated.
delegate_->HandlePaint(NULL);
ValidateRect(hwnd(), NULL);
#else
RECT dirty_rect;
// Try to paint accelerated first.
if (GetUpdateRect(hwnd(), &dirty_rect, FALSE) &&
!IsRectEmpty(&dirty_rect)) {
if (delegate_->HandlePaintAccelerated(gfx::Rect(dirty_rect))) {
ValidateRect(hwnd(), NULL);
} else {
scoped_ptr<gfx::CanvasPaint> canvas(
gfx::CanvasPaint::CreateCanvasPaint(hwnd()));
delegate_->HandlePaint(canvas->AsCanvas());
}
} else {
// TODO(msw): Find a better solution for this crbug.com/93530 workaround.
// Some scenarios otherwise fail to validate minimized app/popup windows.
ValidateRect(hwnd(), NULL);
}
#endif
}
LRESULT HWNDMessageHandler::OnPowerBroadcast(DWORD power_event, DWORD data) {
base::SystemMonitor* monitor = base::SystemMonitor::Get();
if (monitor)
monitor->ProcessWmPowerBroadcastMessage(power_event);
SetMsgHandled(FALSE);
return 0;
}
LRESULT HWNDMessageHandler::OnReflectedMessage(UINT message,
WPARAM w_param,
LPARAM l_param) {
SetMsgHandled(FALSE);
return 0;
}
LRESULT HWNDMessageHandler::OnSetCursor(UINT message,
WPARAM w_param,
LPARAM l_param) {
// Using ScopedRedrawLock here frequently allows content behind this window to
// paint in front of this window, causing glaring rendering artifacts.
// If omitting ScopedRedrawLock here triggers caption rendering artifacts via
// DefWindowProc message handling, we'll need to find a better solution.
SetMsgHandled(FALSE);
return 0;
}
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);
}
}
void HWNDMessageHandler::OnSize(UINT param, const CSize& 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);
}
void HWNDMessageHandler::OnSysCommand(UINT notification_code,
const CPoint& point) {
if (!delegate_->IsWidgetWindow())
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 (fullscreen_handler_->fullscreen() &&
(((notification_code & sc_mask) == SC_SIZE) ||
((notification_code & sc_mask) == SC_MOVE) ||
((notification_code & sc_mask) == SC_MAXIMIZE)))
return;
if (delegate_->IsUsingCustomFrame()) {
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 (base::win::IsShiftPressed())
modifiers |= ui::EF_SHIFT_DOWN;
if (base::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)) {
DefWindowProc(hwnd(), WM_SYSCOMMAND, notification_code,
MAKELPARAM(point.x, point.y));
}
}
void HWNDMessageHandler::OnThemeChanged() {
// TODO(beng): resolve vis-a-vis aura.
#if !defined(USE_AURA)
ui::NativeThemeWin::instance()->CloseHandles();
#endif
}
LRESULT HWNDMessageHandler::OnTouchEvent(UINT message,
WPARAM w_param,
LPARAM l_param) {
int num_points = LOWORD(w_param);
scoped_array<TOUCHINPUT> input(new TOUCHINPUT[num_points]);
if (GetTouchInputInfo(reinterpret_cast<HTOUCHINPUT>(l_param),
num_points, input.get(), sizeof(TOUCHINPUT))) {
for (int i = 0; i < num_points; ++i) {
if (input[i].dwFlags & TOUCHEVENTF_DOWN)
touch_ids_.insert(input[i].dwID);
if (input[i].dwFlags & TOUCHEVENTF_UP)
touch_ids_.erase(input[i].dwID);
}
}
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())) {
CRect 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 (monitor && (monitor == last_monitor_) &&
((fullscreen_handler_->fullscreen() &&
!fullscreen_handler_->metro_snap()) ||
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 (fullscreen_handler_->fullscreen()) {
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).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;
DCHECK(!ignore_pos_changes_factory_.HasWeakPtrs());
MessageLoop::current()->PostTask(
FROM_HERE,
base::Bind(&HWNDMessageHandler::StopIgnoringPosChanges,
ignore_pos_changes_factory_.GetWeakPtr()));
}
last_monitor_ = monitor;
last_monitor_rect_ = monitor_rect;
last_work_area_ = work_area;
}
}
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;
}
// When WM_WINDOWPOSCHANGING message is handled by DefWindowProc, it will
// enforce (cx, cy) not to be smaller than (6, 6) for any non-popup window.
// We work around this by changing cy back to our intended value.
if (!GetParent(hwnd()) && !(window_pos->flags & SWP_NOSIZE) &&
window_pos->cy < 6) {
LONG old_cy = window_pos->cy;
DefWindowProc(hwnd(), WM_WINDOWPOSCHANGING, 0,
reinterpret_cast<LPARAM>(window_pos));
window_pos->cy = old_cy;
SetMsgHandled(TRUE);
return;
}
SetMsgHandled(FALSE);
}
void HWNDMessageHandler::OnWindowPosChanged(WINDOWPOS* window_pos) {
if (DidClientAreaSizeChange(window_pos))
ClientAreaSizeChanged();
if (remove_standard_frame_ && window_pos->flags & SWP_FRAMECHANGED &&
ui::win::IsAeroGlassEnabled()) {
MARGINS m = {10, 10, 10, 10};
DwmExtendFrameIntoClientArea(hwnd(), &m);
}
if (window_pos->flags & SWP_SHOWWINDOW)
delegate_->HandleVisibilityChanged(true);
else if (window_pos->flags & SWP_HIDEWINDOW)
delegate_->HandleVisibilityChanged(false);
SetMsgHandled(FALSE);
}
} // namespace views