1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "ui/views/win/hwnd_message_handler.h"
10 #pragma comment(lib, "wtsapi32.lib")
12 #include "base/bind.h"
13 #include "base/debug/trace_event.h"
14 #include "base/win/win_util.h"
15 #include "base/win/windows_version.h"
16 #include "ui/base/touch/touch_enabled.h"
17 #include "ui/base/win/lock_state.h"
18 #include "ui/base/win/mouse_wheel_util.h"
19 #include "ui/base/win/shell.h"
20 #include "ui/base/win/touch_input.h"
21 #include "ui/events/event.h"
22 #include "ui/events/event_utils.h"
23 #include "ui/events/gestures/gesture_sequence.h"
24 #include "ui/events/keycodes/keyboard_code_conversion_win.h"
25 #include "ui/gfx/canvas.h"
26 #include "ui/gfx/canvas_skia_paint.h"
27 #include "ui/gfx/icon_util.h"
28 #include "ui/gfx/insets.h"
29 #include "ui/gfx/path.h"
30 #include "ui/gfx/path_win.h"
31 #include "ui/gfx/screen.h"
32 #include "ui/gfx/win/dpi.h"
33 #include "ui/gfx/win/hwnd_util.h"
34 #include "ui/native_theme/native_theme_win.h"
35 #include "ui/views/views_delegate.h"
36 #include "ui/views/widget/monitor_win.h"
37 #include "ui/views/widget/native_widget_win.h"
38 #include "ui/views/widget/widget_hwnd_utils.h"
39 #include "ui/views/win/appbar.h"
40 #include "ui/views/win/fullscreen_handler.h"
41 #include "ui/views/win/hwnd_message_handler_delegate.h"
42 #include "ui/views/win/scoped_fullscreen_visibility.h"
44 #if !defined(USE_AURA)
45 #include "ui/views/accessibility/native_view_accessibility_win.h"
46 #include "ui/views/widget/child_window_message_processor.h"
52 // MoveLoopMouseWatcher is used to determine if the user canceled or completed a
53 // move. win32 doesn't appear to offer a way to determine the result of a move,
54 // so we install hooks to determine if we got a mouse up and assume the move
56 class MoveLoopMouseWatcher {
58 MoveLoopMouseWatcher(HWNDMessageHandler* host, bool hide_on_escape);
59 ~MoveLoopMouseWatcher();
61 // Returns true if the mouse is up, or if we couldn't install the hook.
62 bool got_mouse_up() const { return got_mouse_up_; }
65 // Instance that owns the hook. We only allow one instance to hook the mouse
67 static MoveLoopMouseWatcher* instance_;
69 // Key and mouse callbacks from the hook.
70 static LRESULT CALLBACK MouseHook(int n_code, WPARAM w_param, LPARAM l_param);
71 static LRESULT CALLBACK KeyHook(int n_code, WPARAM w_param, LPARAM l_param);
75 // HWNDMessageHandler that created us.
76 HWNDMessageHandler* host_;
78 // Should the window be hidden when escape is pressed?
79 const bool hide_on_escape_;
81 // Did we get a mouse up?
88 DISALLOW_COPY_AND_ASSIGN(MoveLoopMouseWatcher);
92 MoveLoopMouseWatcher* MoveLoopMouseWatcher::instance_ = NULL;
94 MoveLoopMouseWatcher::MoveLoopMouseWatcher(HWNDMessageHandler* host,
97 hide_on_escape_(hide_on_escape),
101 // Only one instance can be active at a time.
105 mouse_hook_ = SetWindowsHookEx(
106 WH_MOUSE, &MouseHook, NULL, GetCurrentThreadId());
109 // We don't care if setting the key hook succeeded.
110 key_hook_ = SetWindowsHookEx(
111 WH_KEYBOARD, &KeyHook, NULL, GetCurrentThreadId());
113 if (instance_ != this) {
114 // Failed installation. Assume we got a mouse up in this case, otherwise
115 // we'll think all drags were canceled.
116 got_mouse_up_ = true;
120 MoveLoopMouseWatcher::~MoveLoopMouseWatcher() {
124 void MoveLoopMouseWatcher::Unhook() {
125 if (instance_ != this)
129 UnhookWindowsHookEx(mouse_hook_);
131 UnhookWindowsHookEx(key_hook_);
138 LRESULT CALLBACK MoveLoopMouseWatcher::MouseHook(int n_code,
142 if (n_code == HC_ACTION && w_param == WM_LBUTTONUP)
143 instance_->got_mouse_up_ = true;
144 return CallNextHookEx(instance_->mouse_hook_, n_code, w_param, l_param);
148 LRESULT CALLBACK MoveLoopMouseWatcher::KeyHook(int n_code,
151 if (n_code == HC_ACTION && w_param == VK_ESCAPE) {
152 if (base::win::GetVersion() >= base::win::VERSION_VISTA) {
154 HRESULT result = DwmSetWindowAttribute(
155 instance_->host_->hwnd(),
156 DWMWA_TRANSITIONS_FORCEDISABLED,
160 if (instance_->hide_on_escape_)
161 instance_->host_->Hide();
163 return CallNextHookEx(instance_->key_hook_, n_code, w_param, l_param);
166 // Called from OnNCActivate.
167 BOOL CALLBACK EnumChildWindowsForRedraw(HWND hwnd, LPARAM lparam) {
169 GetWindowThreadProcessId(hwnd, &process_id);
170 int flags = RDW_INVALIDATE | RDW_NOCHILDREN | RDW_FRAME;
171 if (process_id == GetCurrentProcessId())
172 flags |= RDW_UPDATENOW;
173 RedrawWindow(hwnd, NULL, NULL, flags);
177 bool GetMonitorAndRects(const RECT& rect,
179 gfx::Rect* monitor_rect,
180 gfx::Rect* work_area) {
182 DCHECK(monitor_rect);
184 *monitor = MonitorFromRect(&rect, MONITOR_DEFAULTTONULL);
187 MONITORINFO monitor_info = { 0 };
188 monitor_info.cbSize = sizeof(monitor_info);
189 GetMonitorInfo(*monitor, &monitor_info);
190 *monitor_rect = gfx::Rect(monitor_info.rcMonitor);
191 *work_area = gfx::Rect(monitor_info.rcWork);
195 struct FindOwnedWindowsData {
197 std::vector<Widget*> owned_widgets;
200 BOOL CALLBACK FindOwnedWindowsCallback(HWND hwnd, LPARAM param) {
201 // TODO(beng): resolve wrt aura.
202 #if !defined(USE_AURA)
203 FindOwnedWindowsData* data = reinterpret_cast<FindOwnedWindowsData*>(param);
204 if (GetWindow(hwnd, GW_OWNER) == data->window) {
205 Widget* widget = Widget::GetWidgetForNativeView(hwnd);
207 data->owned_widgets.push_back(widget);
213 // Enables or disables the menu item for the specified command and menu.
214 void EnableMenuItemByCommand(HMENU menu, UINT command, bool enabled) {
215 UINT flags = MF_BYCOMMAND | (enabled ? MF_ENABLED : MF_DISABLED | MF_GRAYED);
216 EnableMenuItem(menu, command, flags);
219 // Callback used to notify child windows that the top level window received a
220 // DWMCompositionChanged message.
221 BOOL CALLBACK SendDwmCompositionChanged(HWND window, LPARAM param) {
222 SendMessage(window, WM_DWMCOMPOSITIONCHANGED, 0, 0);
226 // See comments in OnNCPaint() for details of this struct.
228 // The window being painted.
234 // Origin of the window in terms of the screen.
239 // See comments in OnNCPaint() for details of this function.
240 static BOOL CALLBACK ClipDCToChild(HWND window, LPARAM param) {
241 ClipState* clip_state = reinterpret_cast<ClipState*>(param);
242 if (GetParent(window) == clip_state->parent && IsWindowVisible(window)) {
244 GetWindowRect(window, &bounds);
245 ExcludeClipRect(clip_state->dc,
246 bounds.left - clip_state->x,
247 bounds.top - clip_state->y,
248 bounds.right - clip_state->x,
249 bounds.bottom - clip_state->y);
254 #if !defined(USE_AURA)
256 // Get the source HWND of the specified message. Depending on the message, the
257 // source HWND is encoded in either the WPARAM or the LPARAM value.
258 HWND GetControlHWNDForMessage(UINT message, WPARAM w_param, LPARAM l_param) {
259 // Each of the following messages can be sent by a child HWND and must be
260 // forwarded to its associated NativeControlWin for handling.
263 return reinterpret_cast<NMHDR*>(l_param)->hwndFrom;
265 return reinterpret_cast<HWND>(l_param);
267 return reinterpret_cast<HWND>(w_param);
269 case WM_CTLCOLORSTATIC:
270 return reinterpret_cast<HWND>(l_param);
275 // Some messages may be sent to us by a child HWND. If this is the case, this
276 // function will forward those messages on to the object associated with the
277 // source HWND and return true, in which case the window procedure must not do
278 // any further processing of the message. If there is no associated
279 // ChildWindowMessageProcessor, the return value will be false and the WndProc
280 // can continue processing the message normally. |l_result| contains the result
281 // of the message processing by the control and must be returned by the WndProc
282 // if the return value is true.
283 bool ProcessChildWindowMessage(UINT message,
289 HWND control_hwnd = GetControlHWNDForMessage(message, w_param, l_param);
290 if (IsWindow(control_hwnd)) {
291 ChildWindowMessageProcessor* processor =
292 ChildWindowMessageProcessor::Get(control_hwnd);
294 return processor->ProcessMessage(message, w_param, l_param, l_result);
302 // The thickness of an auto-hide taskbar in pixels.
303 const int kAutoHideTaskbarThicknessPx = 2;
305 bool IsTopLevelWindow(HWND window) {
306 long style = ::GetWindowLong(window, GWL_STYLE);
307 if (!(style & WS_CHILD))
309 HWND parent = ::GetParent(window);
310 return !parent || (parent == ::GetDesktopWindow());
313 void AddScrollStylesToWindow(HWND window) {
314 if (::IsWindow(window)) {
315 long current_style = ::GetWindowLong(window, GWL_STYLE);
316 ::SetWindowLong(window, GWL_STYLE,
317 current_style | WS_VSCROLL | WS_HSCROLL);
323 // A scoping class that prevents a window from being able to redraw in response
324 // to invalidations that may occur within it for the lifetime of the object.
326 // Why would we want such a thing? Well, it turns out Windows has some
327 // "unorthodox" behavior when it comes to painting its non-client areas.
328 // Occasionally, Windows will paint portions of the default non-client area
329 // right over the top of the custom frame. This is not simply fixed by handling
330 // WM_NCPAINT/WM_PAINT, with some investigation it turns out that this
331 // rendering is being done *inside* the default implementation of some message
332 // handlers and functions:
335 // . WM_NCLBUTTONDOWN
336 // . EnableMenuItem, called from our WM_INITMENU handler
337 // The solution is to handle these messages and call DefWindowProc ourselves,
338 // but prevent the window from being able to update itself for the duration of
339 // the call. We do this with this class, which automatically calls its
340 // associated Window's lock and unlock functions as it is created and destroyed.
341 // See documentation in those methods for the technique used.
343 // The lock only has an effect if the window was visible upon lock creation, as
344 // it doesn't guard against direct visiblility changes, and multiple locks may
345 // exist simultaneously to handle certain nested Windows messages.
347 // IMPORTANT: Do not use this scoping object for large scopes or periods of
348 // time! IT WILL PREVENT THE WINDOW FROM BEING REDRAWN! (duh).
350 // I would love to hear Raymond Chen's explanation for all this. And maybe a
351 // list of other messages that this applies to ;-)
352 class HWNDMessageHandler::ScopedRedrawLock {
354 explicit ScopedRedrawLock(HWNDMessageHandler* owner)
356 hwnd_(owner_->hwnd()),
357 was_visible_(owner_->IsVisible()),
358 cancel_unlock_(false),
359 force_(!(GetWindowLong(hwnd_, GWL_STYLE) & WS_CAPTION)) {
360 if (was_visible_ && ::IsWindow(hwnd_))
361 owner_->LockUpdates(force_);
364 ~ScopedRedrawLock() {
365 if (!cancel_unlock_ && was_visible_ && ::IsWindow(hwnd_))
366 owner_->UnlockUpdates(force_);
369 // Cancel the unlock operation, call this if the Widget is being destroyed.
370 void CancelUnlockOperation() { cancel_unlock_ = true; }
373 // The owner having its style changed.
374 HWNDMessageHandler* owner_;
375 // The owner's HWND, cached to avoid action after window destruction.
377 // Records the HWND visibility at the time of creation.
379 // A flag indicating that the unlock operation was canceled.
381 // If true, perform the redraw lock regardless of Aero state.
384 DISALLOW_COPY_AND_ASSIGN(ScopedRedrawLock);
387 ////////////////////////////////////////////////////////////////////////////////
388 // HWNDMessageHandler, public:
390 HWNDMessageHandler::HWNDMessageHandler(HWNDMessageHandlerDelegate* delegate)
391 : delegate_(delegate),
392 fullscreen_handler_(new FullscreenHandler),
394 waiting_for_close_now_(false),
395 remove_standard_frame_(false),
396 use_system_default_icon_(false),
397 restore_focus_when_enabled_(false),
398 restored_enabled_(false),
399 current_cursor_(NULL),
400 previous_cursor_(NULL),
401 active_mouse_tracking_flags_(0),
402 is_right_mouse_pressed_on_caption_(false),
403 lock_updates_count_(0),
404 ignore_window_pos_changes_(false),
406 use_layered_buffer_(false),
408 waiting_for_redraw_layered_window_contents_(false),
409 is_first_nccalc_(true),
411 autohide_factory_(this),
413 needs_scroll_styles_(false),
414 in_size_loop_(false) {
417 HWNDMessageHandler::~HWNDMessageHandler() {
419 // Prevent calls back into this class via WNDPROC now that we've been
424 void HWNDMessageHandler::Init(HWND parent, const gfx::Rect& bounds) {
425 TRACE_EVENT0("views", "HWNDMessageHandler::Init");
426 GetMonitorAndRects(bounds.ToRECT(), &last_monitor_, &last_monitor_rect_,
429 // Create the window.
430 WindowImpl::Init(parent, bounds);
432 #if defined(USE_AURA)
433 // Certain trackpad drivers on Windows have bugs where in they don't generate
434 // WM_MOUSEWHEEL messages for the trackpoint and trackpad scrolling gestures
435 // unless there is an entry for Chrome with the class name of the Window.
436 // These drivers check if the window under the trackpoint has the WS_VSCROLL/
437 // WS_HSCROLL style and if yes they generate the legacy WM_VSCROLL/WM_HSCROLL
438 // messages. We add these styles to ensure that trackpad/trackpoint scrolling
441 // Look into moving the WS_VSCROLL and WS_HSCROLL style setting logic to the
442 // CalculateWindowStylesFromInitParams function. Doing it there seems to
443 // cause some interactive tests to fail. Investigation needed.
444 if (IsTopLevelWindow(hwnd())) {
445 long current_style = ::GetWindowLong(hwnd(), GWL_STYLE);
446 if (!(current_style & WS_POPUP)) {
447 AddScrollStylesToWindow(hwnd());
448 needs_scroll_styles_ = true;
454 void HWNDMessageHandler::InitModalType(ui::ModalType modal_type) {
455 if (modal_type == ui::MODAL_TYPE_NONE)
457 // We implement modality by crawling up the hierarchy of windows starting
458 // at the owner, disabling all of them so that they don't receive input
460 HWND start = ::GetWindow(hwnd(), GW_OWNER);
462 ::EnableWindow(start, FALSE);
463 start = ::GetParent(start);
467 void HWNDMessageHandler::Close() {
468 if (!IsWindow(hwnd()))
469 return; // No need to do anything.
471 // Let's hide ourselves right away.
474 // Modal dialog windows disable their owner windows; re-enable them now so
475 // they can activate as foreground windows upon this window's destruction.
476 RestoreEnabledIfNecessary();
478 if (!waiting_for_close_now_) {
479 // And we delay the close so that if we are called from an ATL callback,
480 // we don't destroy the window before the callback returned (as the caller
481 // may delete ourselves on destroy and the ATL callback would still
482 // dereference us when the callback returns).
483 waiting_for_close_now_ = true;
484 base::MessageLoop::current()->PostTask(
486 base::Bind(&HWNDMessageHandler::CloseNow, weak_factory_.GetWeakPtr()));
490 void HWNDMessageHandler::CloseNow() {
491 // We may already have been destroyed if the selection resulted in a tab
492 // switch which will have reactivated the browser window and closed us, so
493 // we need to check to see if we're still a window before trying to destroy
495 waiting_for_close_now_ = false;
496 if (IsWindow(hwnd()))
497 DestroyWindow(hwnd());
500 gfx::Rect HWNDMessageHandler::GetWindowBoundsInScreen() const {
502 GetWindowRect(hwnd(), &r);
506 gfx::Rect HWNDMessageHandler::GetClientAreaBoundsInScreen() const {
508 GetClientRect(hwnd(), &r);
509 POINT point = { r.left, r.top };
510 ClientToScreen(hwnd(), &point);
511 return gfx::Rect(point.x, point.y, r.right - r.left, r.bottom - r.top);
514 gfx::Rect HWNDMessageHandler::GetRestoredBounds() const {
515 // If we're in fullscreen mode, we've changed the normal bounds to the monitor
516 // rect, so return the saved bounds instead.
517 if (fullscreen_handler_->fullscreen())
518 return fullscreen_handler_->GetRestoreBounds();
521 GetWindowPlacement(&bounds, NULL);
525 gfx::Rect HWNDMessageHandler::GetClientAreaBounds() const {
528 if (delegate_->WidgetSizeIsClientSize())
529 return GetClientAreaBoundsInScreen();
530 return GetWindowBoundsInScreen();
533 void HWNDMessageHandler::GetWindowPlacement(
535 ui::WindowShowState* show_state) const {
537 wp.length = sizeof(wp);
538 const bool succeeded = !!::GetWindowPlacement(hwnd(), &wp);
541 if (bounds != NULL) {
542 if (wp.showCmd == SW_SHOWNORMAL) {
543 // GetWindowPlacement can return misleading position if a normalized
544 // window was resized using Aero Snap feature (see comment 9 in bug
545 // 36421). As a workaround, using GetWindowRect for normalized windows.
546 const bool succeeded = GetWindowRect(hwnd(), &wp.rcNormalPosition) != 0;
549 *bounds = gfx::Rect(wp.rcNormalPosition);
552 mi.cbSize = sizeof(mi);
553 const bool succeeded = GetMonitorInfo(
554 MonitorFromWindow(hwnd(), MONITOR_DEFAULTTONEAREST), &mi) != 0;
557 *bounds = gfx::Rect(wp.rcNormalPosition);
558 // Convert normal position from workarea coordinates to screen
560 bounds->Offset(mi.rcWork.left - mi.rcMonitor.left,
561 mi.rcWork.top - mi.rcMonitor.top);
566 if (wp.showCmd == SW_SHOWMAXIMIZED)
567 *show_state = ui::SHOW_STATE_MAXIMIZED;
568 else if (wp.showCmd == SW_SHOWMINIMIZED)
569 *show_state = ui::SHOW_STATE_MINIMIZED;
571 *show_state = ui::SHOW_STATE_NORMAL;
575 void HWNDMessageHandler::SetBounds(const gfx::Rect& bounds_in_pixels) {
576 LONG style = GetWindowLong(hwnd(), GWL_STYLE);
577 if (style & WS_MAXIMIZE)
578 SetWindowLong(hwnd(), GWL_STYLE, style & ~WS_MAXIMIZE);
579 SetWindowPos(hwnd(), NULL, bounds_in_pixels.x(), bounds_in_pixels.y(),
580 bounds_in_pixels.width(), bounds_in_pixels.height(),
581 SWP_NOACTIVATE | SWP_NOZORDER);
584 void HWNDMessageHandler::SetSize(const gfx::Size& size) {
585 SetWindowPos(hwnd(), NULL, 0, 0, size.width(), size.height(),
586 SWP_NOACTIVATE | SWP_NOZORDER | SWP_NOMOVE);
589 void HWNDMessageHandler::CenterWindow(const gfx::Size& size) {
590 HWND parent = GetParent(hwnd());
591 if (!IsWindow(hwnd()))
592 parent = ::GetWindow(hwnd(), GW_OWNER);
593 gfx::CenterAndSizeWindow(parent, hwnd(), size);
596 void HWNDMessageHandler::SetRegion(HRGN region) {
597 custom_window_region_.Set(region);
598 ResetWindowRegion(false, true);
599 UpdateDwmNcRenderingPolicy();
602 void HWNDMessageHandler::StackAbove(HWND other_hwnd) {
603 SetWindowPos(hwnd(), other_hwnd, 0, 0, 0, 0,
604 SWP_NOSIZE | SWP_NOMOVE | SWP_NOACTIVATE);
607 void HWNDMessageHandler::StackAtTop() {
608 SetWindowPos(hwnd(), HWND_TOP, 0, 0, 0, 0,
609 SWP_NOSIZE | SWP_NOMOVE | SWP_NOACTIVATE);
612 void HWNDMessageHandler::Show() {
613 if (IsWindow(hwnd())) {
614 if (!(GetWindowLong(hwnd(), GWL_EXSTYLE) & WS_EX_TRANSPARENT) &&
615 !(GetWindowLong(hwnd(), GWL_EXSTYLE) & WS_EX_NOACTIVATE)) {
616 ShowWindowWithState(ui::SHOW_STATE_NORMAL);
618 ShowWindowWithState(ui::SHOW_STATE_INACTIVE);
623 void HWNDMessageHandler::ShowWindowWithState(ui::WindowShowState show_state) {
624 TRACE_EVENT0("views", "HWNDMessageHandler::ShowWindowWithState");
625 DWORD native_show_state;
626 switch (show_state) {
627 case ui::SHOW_STATE_INACTIVE:
628 native_show_state = SW_SHOWNOACTIVATE;
630 case ui::SHOW_STATE_MAXIMIZED:
631 native_show_state = SW_SHOWMAXIMIZED;
633 case ui::SHOW_STATE_MINIMIZED:
634 native_show_state = SW_SHOWMINIMIZED;
637 native_show_state = delegate_->GetInitialShowState();
641 ShowWindow(hwnd(), native_show_state);
642 // When launched from certain programs like bash and Windows Live Messenger,
643 // show_state is set to SW_HIDE, so we need to correct that condition. We
644 // don't just change show_state to SW_SHOWNORMAL because MSDN says we must
645 // always first call ShowWindow with the specified value from STARTUPINFO,
646 // otherwise all future ShowWindow calls will be ignored (!!#@@#!). Instead,
647 // we call ShowWindow again in this case.
648 if (native_show_state == SW_HIDE) {
649 native_show_state = SW_SHOWNORMAL;
650 ShowWindow(hwnd(), native_show_state);
653 // We need to explicitly activate the window if we've been shown with a state
654 // that should activate, because if we're opened from a desktop shortcut while
655 // an existing window is already running it doesn't seem to be enough to use
656 // one of these flags to activate the window.
657 if (native_show_state == SW_SHOWNORMAL ||
658 native_show_state == SW_SHOWMAXIMIZED)
661 if (!delegate_->HandleInitialFocus(show_state))
665 void HWNDMessageHandler::ShowMaximizedWithBounds(const gfx::Rect& bounds) {
666 WINDOWPLACEMENT placement = { 0 };
667 placement.length = sizeof(WINDOWPLACEMENT);
668 placement.showCmd = SW_SHOWMAXIMIZED;
669 placement.rcNormalPosition = bounds.ToRECT();
670 SetWindowPlacement(hwnd(), &placement);
673 void HWNDMessageHandler::Hide() {
674 if (IsWindow(hwnd())) {
675 // NOTE: Be careful not to activate any windows here (for example, calling
676 // ShowWindow(SW_HIDE) will automatically activate another window). This
677 // code can be called while a window is being deactivated, and activating
678 // another window will screw up the activation that is already in progress.
679 SetWindowPos(hwnd(), NULL, 0, 0, 0, 0,
680 SWP_HIDEWINDOW | SWP_NOACTIVATE | SWP_NOMOVE |
681 SWP_NOREPOSITION | SWP_NOSIZE | SWP_NOZORDER);
683 if (!GetParent(hwnd()))
684 NotifyOwnedWindowsParentClosing();
688 void HWNDMessageHandler::Maximize() {
689 ExecuteSystemMenuCommand(SC_MAXIMIZE);
692 void HWNDMessageHandler::Minimize() {
693 ExecuteSystemMenuCommand(SC_MINIMIZE);
694 delegate_->HandleNativeBlur(NULL);
697 void HWNDMessageHandler::Restore() {
698 ExecuteSystemMenuCommand(SC_RESTORE);
701 void HWNDMessageHandler::Activate() {
703 ::ShowWindow(hwnd(), SW_RESTORE);
704 ::SetWindowPos(hwnd(), HWND_TOP, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE);
705 SetForegroundWindow(hwnd());
708 void HWNDMessageHandler::Deactivate() {
709 HWND next_hwnd = ::GetNextWindow(hwnd(), GW_HWNDNEXT);
711 if (::IsWindowVisible(next_hwnd)) {
712 ::SetForegroundWindow(next_hwnd);
715 next_hwnd = ::GetNextWindow(next_hwnd, GW_HWNDNEXT);
719 void HWNDMessageHandler::SetAlwaysOnTop(bool on_top) {
720 ::SetWindowPos(hwnd(), on_top ? HWND_TOPMOST : HWND_NOTOPMOST,
721 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE);
724 bool HWNDMessageHandler::IsVisible() const {
725 return !!::IsWindowVisible(hwnd());
728 bool HWNDMessageHandler::IsActive() const {
729 return GetActiveWindow() == hwnd();
732 bool HWNDMessageHandler::IsMinimized() const {
733 return !!::IsIconic(hwnd());
736 bool HWNDMessageHandler::IsMaximized() const {
737 return !!::IsZoomed(hwnd());
740 bool HWNDMessageHandler::IsAlwaysOnTop() const {
741 return (GetWindowLong(hwnd(), GWL_EXSTYLE) & WS_EX_TOPMOST) != 0;
744 bool HWNDMessageHandler::RunMoveLoop(const gfx::Vector2d& drag_offset,
745 bool hide_on_escape) {
747 MoveLoopMouseWatcher watcher(this, hide_on_escape);
748 #if defined(USE_AURA)
749 // In Aura, we handle touch events asynchronously. So we need to allow nested
750 // tasks while in windows move loop.
751 base::MessageLoop::ScopedNestableTaskAllower allow_nested(
752 base::MessageLoop::current());
754 SendMessage(hwnd(), WM_SYSCOMMAND, SC_MOVE | 0x0002, GetMessagePos());
755 // Windows doesn't appear to offer a way to determine whether the user
756 // canceled the move or not. We assume if the user released the mouse it was
758 return watcher.got_mouse_up();
761 void HWNDMessageHandler::EndMoveLoop() {
762 SendMessage(hwnd(), WM_CANCELMODE, 0, 0);
765 void HWNDMessageHandler::SendFrameChanged() {
766 SetWindowPos(hwnd(), NULL, 0, 0, 0, 0,
767 SWP_FRAMECHANGED | SWP_NOACTIVATE | SWP_NOCOPYBITS |
768 SWP_NOMOVE | SWP_NOOWNERZORDER | SWP_NOREPOSITION |
769 SWP_NOSENDCHANGING | SWP_NOSIZE | SWP_NOZORDER);
772 void HWNDMessageHandler::FlashFrame(bool flash) {
774 fwi.cbSize = sizeof(fwi);
777 fwi.dwFlags = FLASHW_ALL;
781 fwi.dwFlags = FLASHW_STOP;
786 void HWNDMessageHandler::ClearNativeFocus() {
790 void HWNDMessageHandler::SetCapture() {
791 DCHECK(!HasCapture());
792 ::SetCapture(hwnd());
795 void HWNDMessageHandler::ReleaseCapture() {
800 bool HWNDMessageHandler::HasCapture() const {
801 return ::GetCapture() == hwnd();
804 void HWNDMessageHandler::SetVisibilityChangedAnimationsEnabled(bool enabled) {
805 if (base::win::GetVersion() >= base::win::VERSION_VISTA) {
806 int dwm_value = enabled ? FALSE : TRUE;
807 DwmSetWindowAttribute(
808 hwnd(), DWMWA_TRANSITIONS_FORCEDISABLED, &dwm_value, sizeof(dwm_value));
812 bool HWNDMessageHandler::SetTitle(const base::string16& title) {
813 base::string16 current_title;
814 size_t len_with_null = GetWindowTextLength(hwnd()) + 1;
815 if (len_with_null == 1 && title.length() == 0)
817 if (len_with_null - 1 == title.length() &&
819 hwnd(), WriteInto(¤t_title, len_with_null), len_with_null) &&
820 current_title == title)
822 SetWindowText(hwnd(), title.c_str());
826 void HWNDMessageHandler::SetCursor(HCURSOR cursor) {
828 previous_cursor_ = ::SetCursor(cursor);
829 current_cursor_ = cursor;
830 } else if (previous_cursor_) {
831 ::SetCursor(previous_cursor_);
832 previous_cursor_ = NULL;
836 void HWNDMessageHandler::FrameTypeChanged() {
837 // Called when the frame type could possibly be changing (theme change or
838 // DWM composition change).
840 // Don't redraw the window here, because we need to hide and show the window
841 // which will also trigger a redraw.
842 ResetWindowRegion(true, false);
844 // The non-client view needs to update too.
845 delegate_->HandleFrameChanged();
847 if (IsVisible() && !delegate_->IsUsingCustomFrame()) {
848 // For some reason, we need to hide the window after we change from a custom
849 // frame to a native frame. If we don't, the client area will be filled
850 // with black. This seems to be related to an interaction between DWM and
851 // SetWindowRgn, but the details aren't clear. Additionally, we need to
852 // specify SWP_NOZORDER here, otherwise if you have multiple chrome windows
853 // open they will re-appear with a non-deterministic Z-order.
854 UINT flags = SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER;
855 SetWindowPos(hwnd(), NULL, 0, 0, 0, 0, flags | SWP_HIDEWINDOW);
856 SetWindowPos(hwnd(), NULL, 0, 0, 0, 0, flags | SWP_SHOWWINDOW);
858 UpdateWindow(hwnd());
861 // WM_DWMCOMPOSITIONCHANGED is only sent to top level windows, however we want
862 // to notify our children too, since we can have MDI child windows who need to
863 // update their appearance.
864 EnumChildWindows(hwnd(), &SendDwmCompositionChanged, NULL);
867 void HWNDMessageHandler::SchedulePaintInRect(const gfx::Rect& rect) {
868 if (use_layered_buffer_) {
869 // We must update the back-buffer immediately, since Windows' handling of
870 // invalid rects is somewhat mysterious.
871 invalid_rect_.Union(rect);
873 // In some situations, such as drag and drop, when Windows itself runs a
874 // nested message loop our message loop appears to be starved and we don't
875 // receive calls to DidProcessMessage(). This only seems to affect layered
876 // windows, so we schedule a redraw manually using a task, since those never
877 // seem to be starved. Also, wtf.
878 if (!waiting_for_redraw_layered_window_contents_) {
879 waiting_for_redraw_layered_window_contents_ = true;
880 base::MessageLoop::current()->PostTask(
882 base::Bind(&HWNDMessageHandler::RedrawLayeredWindowContents,
883 weak_factory_.GetWeakPtr()));
886 // InvalidateRect() expects client coordinates.
887 RECT r = rect.ToRECT();
888 InvalidateRect(hwnd(), &r, FALSE);
892 void HWNDMessageHandler::SetOpacity(BYTE opacity) {
893 layered_alpha_ = opacity;
896 void HWNDMessageHandler::SetWindowIcons(const gfx::ImageSkia& window_icon,
897 const gfx::ImageSkia& app_icon) {
898 if (!window_icon.isNull()) {
899 HICON windows_icon = IconUtil::CreateHICONFromSkBitmap(
900 *window_icon.bitmap());
901 // We need to make sure to destroy the previous icon, otherwise we'll leak
902 // these GDI objects until we crash!
903 HICON old_icon = reinterpret_cast<HICON>(
904 SendMessage(hwnd(), WM_SETICON, ICON_SMALL,
905 reinterpret_cast<LPARAM>(windows_icon)));
907 DestroyIcon(old_icon);
909 if (!app_icon.isNull()) {
910 HICON windows_icon = IconUtil::CreateHICONFromSkBitmap(*app_icon.bitmap());
911 HICON old_icon = reinterpret_cast<HICON>(
912 SendMessage(hwnd(), WM_SETICON, ICON_BIG,
913 reinterpret_cast<LPARAM>(windows_icon)));
915 DestroyIcon(old_icon);
919 ////////////////////////////////////////////////////////////////////////////////
920 // HWNDMessageHandler, InputMethodDelegate implementation:
922 void HWNDMessageHandler::DispatchKeyEventPostIME(const ui::KeyEvent& key) {
923 SetMsgHandled(delegate_->HandleKeyEvent(key));
926 ////////////////////////////////////////////////////////////////////////////////
927 // HWNDMessageHandler, gfx::WindowImpl overrides:
929 HICON HWNDMessageHandler::GetDefaultWindowIcon() const {
930 if (use_system_default_icon_)
932 return ViewsDelegate::views_delegate ?
933 ViewsDelegate::views_delegate->GetDefaultWindowIcon() : NULL;
936 LRESULT HWNDMessageHandler::OnWndProc(UINT message,
939 HWND window = hwnd();
942 if (delegate_ && delegate_->PreHandleMSG(message, w_param, l_param, &result))
945 #if !defined(USE_AURA)
946 // First allow messages sent by child controls to be processed directly by
947 // their associated views. If such a view is present, it will handle the
948 // message *instead of* this NativeWidgetWin.
949 if (ProcessChildWindowMessage(message, w_param, l_param, &result))
953 // Otherwise we handle everything else.
954 // NOTE: We inline ProcessWindowMessage() as 'this' may be destroyed during
955 // dispatch and ProcessWindowMessage() doesn't deal with that well.
956 const BOOL old_msg_handled = msg_handled_;
957 base::WeakPtr<HWNDMessageHandler> ref(weak_factory_.GetWeakPtr());
958 const BOOL processed =
959 _ProcessWindowMessage(window, message, w_param, l_param, result, 0);
962 msg_handled_ = old_msg_handled;
965 result = DefWindowProc(window, message, w_param, l_param);
967 // DefWindowProc() may have destroyed the window in a nested message loop.
968 if (!::IsWindow(window))
972 delegate_->PostHandleMSG(message, w_param, l_param);
973 if (message == WM_NCDESTROY) {
974 #if !defined(USE_AURA)
975 base::MessageLoopForUI::current()->RemoveObserver(this);
978 delegate_->HandleDestroyed();
981 // Only top level widget should store/restore focus.
982 if (message == WM_ACTIVATE && delegate_->CanSaveFocus())
983 PostProcessActivateMessage(LOWORD(w_param), !!HIWORD(w_param));
985 if (message == WM_ENABLE && restore_focus_when_enabled_) {
986 // This path should be executed only for top level as
987 // restore_focus_when_enabled_ is set in PostProcessActivateMessage.
988 DCHECK(delegate_->CanSaveFocus());
989 restore_focus_when_enabled_ = false;
990 delegate_->RestoreFocusOnEnable();
995 ////////////////////////////////////////////////////////////////////////////////
996 // HWNDMessageHandler, MessageLoopForUI::Observer implementation:
998 base::EventStatus HWNDMessageHandler::WillProcessEvent(
999 const base::NativeEvent& event) {
1000 return base::EVENT_CONTINUE;
1003 void HWNDMessageHandler::DidProcessEvent(const base::NativeEvent& event) {
1004 RedrawInvalidRect();
1007 ////////////////////////////////////////////////////////////////////////////////
1008 // HWNDMessageHandler, private:
1010 int HWNDMessageHandler::GetAppbarAutohideEdges(HMONITOR monitor) {
1011 autohide_factory_.InvalidateWeakPtrs();
1012 return Appbar::instance()->GetAutohideEdges(
1014 base::Bind(&HWNDMessageHandler::OnAppbarAutohideEdgesChanged,
1015 autohide_factory_.GetWeakPtr()));
1018 void HWNDMessageHandler::OnAppbarAutohideEdgesChanged() {
1019 // This triggers querying WM_NCCALCSIZE again.
1021 GetWindowRect(hwnd(), &client);
1022 SetWindowPos(hwnd(), NULL, client.left, client.top,
1023 client.right - client.left, client.bottom - client.top,
1027 void HWNDMessageHandler::SetInitialFocus() {
1028 if (!(GetWindowLong(hwnd(), GWL_EXSTYLE) & WS_EX_TRANSPARENT) &&
1029 !(GetWindowLong(hwnd(), GWL_EXSTYLE) & WS_EX_NOACTIVATE)) {
1030 // The window does not get keyboard messages unless we focus it.
1035 void HWNDMessageHandler::PostProcessActivateMessage(int activation_state,
1037 DCHECK(delegate_->CanSaveFocus());
1039 bool active = activation_state != WA_INACTIVE && !minimized;
1040 if (delegate_->CanActivate())
1041 delegate_->HandleActivationChanged(active);
1044 // We might get activated/inactivated without being enabled, so we need to
1045 // clear restore_focus_when_enabled_.
1046 restore_focus_when_enabled_ = false;
1047 delegate_->SaveFocusOnDeactivate();
1049 // We must restore the focus after the message has been DefProc'ed as it
1050 // does set the focus to the last focused HWND.
1051 // Note that if the window is not enabled, we cannot restore the focus as
1052 // calling ::SetFocus on a child of the non-enabled top-window would fail.
1053 // This is the case when showing a modal dialog (such as 'open file',
1054 // 'print'...) from a different thread.
1055 // In that case we delay the focus restoration to when the window is enabled
1057 if (!IsWindowEnabled(hwnd())) {
1058 DCHECK(!restore_focus_when_enabled_);
1059 restore_focus_when_enabled_ = true;
1062 delegate_->RestoreFocusOnActivate();
1066 void HWNDMessageHandler::RestoreEnabledIfNecessary() {
1067 if (delegate_->IsModal() && !restored_enabled_) {
1068 restored_enabled_ = true;
1069 // If we were run modally, we need to undo the disabled-ness we inflicted on
1070 // the owner's parent hierarchy.
1071 HWND start = ::GetWindow(hwnd(), GW_OWNER);
1073 ::EnableWindow(start, TRUE);
1074 start = ::GetParent(start);
1079 void HWNDMessageHandler::ExecuteSystemMenuCommand(int command) {
1081 SendMessage(hwnd(), WM_SYSCOMMAND, command, 0);
1084 void HWNDMessageHandler::TrackMouseEvents(DWORD mouse_tracking_flags) {
1085 // Begin tracking mouse events for this HWND so that we get WM_MOUSELEAVE
1086 // when the user moves the mouse outside this HWND's bounds.
1087 if (active_mouse_tracking_flags_ == 0 || mouse_tracking_flags & TME_CANCEL) {
1088 if (mouse_tracking_flags & TME_CANCEL) {
1089 // We're about to cancel active mouse tracking, so empty out the stored
1091 active_mouse_tracking_flags_ = 0;
1093 active_mouse_tracking_flags_ = mouse_tracking_flags;
1096 TRACKMOUSEEVENT tme;
1097 tme.cbSize = sizeof(tme);
1098 tme.dwFlags = mouse_tracking_flags;
1099 tme.hwndTrack = hwnd();
1100 tme.dwHoverTime = 0;
1101 TrackMouseEvent(&tme);
1102 } else if (mouse_tracking_flags != active_mouse_tracking_flags_) {
1103 TrackMouseEvents(active_mouse_tracking_flags_ | TME_CANCEL);
1104 TrackMouseEvents(mouse_tracking_flags);
1108 void HWNDMessageHandler::ClientAreaSizeChanged() {
1109 gfx::Size s = GetClientAreaBounds().size();
1110 delegate_->HandleClientSizeChanged(s);
1111 if (use_layered_buffer_)
1112 layered_window_contents_.reset(new gfx::Canvas(s, 1.0f, false));
1115 bool HWNDMessageHandler::GetClientAreaInsets(gfx::Insets* insets) const {
1116 if (delegate_->GetClientAreaInsets(insets))
1118 DCHECK(insets->empty());
1120 // Returning false causes the default handling in OnNCCalcSize() to
1122 if (!delegate_->IsWidgetWindow() ||
1123 (!delegate_->IsUsingCustomFrame() && !remove_standard_frame_)) {
1127 if (IsMaximized()) {
1128 // Windows automatically adds a standard width border to all sides when a
1129 // window is maximized.
1130 int border_thickness = GetSystemMetrics(SM_CXSIZEFRAME);
1131 if (remove_standard_frame_)
1132 border_thickness -= 1;
1133 *insets = gfx::Insets(
1134 border_thickness, border_thickness, border_thickness, border_thickness);
1138 *insets = gfx::Insets();
1142 void HWNDMessageHandler::ResetWindowRegion(bool force, bool redraw) {
1143 // A native frame uses the native window region, and we don't want to mess
1145 // WS_EX_COMPOSITED is used instead of WS_EX_LAYERED under aura. WS_EX_LAYERED
1146 // automatically makes clicks on transparent pixels fall through, that isn't
1147 // the case with WS_EX_COMPOSITED. So, we route WS_EX_COMPOSITED through to
1148 // the delegate to allow for a custom hit mask.
1149 if ((window_ex_style() & WS_EX_COMPOSITED) == 0 && !custom_window_region_ &&
1150 (!delegate_->IsUsingCustomFrame() || !delegate_->IsWidgetWindow())) {
1152 SetWindowRgn(hwnd(), NULL, redraw);
1156 // Changing the window region is going to force a paint. Only change the
1157 // window region if the region really differs.
1158 HRGN current_rgn = CreateRectRgn(0, 0, 0, 0);
1159 int current_rgn_result = GetWindowRgn(hwnd(), current_rgn);
1162 GetWindowRect(hwnd(), &window_rect);
1164 if (custom_window_region_) {
1165 new_region = ::CreateRectRgn(0, 0, 0, 0);
1166 ::CombineRgn(new_region, custom_window_region_.Get(), NULL, RGN_COPY);
1167 } else if (IsMaximized()) {
1168 HMONITOR monitor = MonitorFromWindow(hwnd(), MONITOR_DEFAULTTONEAREST);
1170 mi.cbSize = sizeof mi;
1171 GetMonitorInfo(monitor, &mi);
1172 CRect work_rect = mi.rcWork;
1173 work_rect.OffsetRect(-window_rect.left, -window_rect.top);
1174 new_region = CreateRectRgnIndirect(&work_rect);
1176 gfx::Path window_mask;
1177 delegate_->GetWindowMask(
1178 gfx::Size(window_rect.Width(), window_rect.Height()), &window_mask);
1179 new_region = gfx::CreateHRGNFromSkPath(window_mask);
1182 if (current_rgn_result == ERROR || !EqualRgn(current_rgn, new_region)) {
1183 // SetWindowRgn takes ownership of the HRGN created by CreateNativeRegion.
1184 SetWindowRgn(hwnd(), new_region, redraw);
1186 DeleteObject(new_region);
1189 DeleteObject(current_rgn);
1192 void HWNDMessageHandler::UpdateDwmNcRenderingPolicy() {
1193 if (base::win::GetVersion() < base::win::VERSION_VISTA)
1195 DWMNCRENDERINGPOLICY policy = custom_window_region_ ? DWMNCRP_DISABLED
1196 : DWMNCRP_USEWINDOWSTYLE;
1197 DwmSetWindowAttribute(hwnd(), DWMWA_NCRENDERING_POLICY,
1198 &policy, sizeof(DWMNCRENDERINGPOLICY));
1201 LRESULT HWNDMessageHandler::DefWindowProcWithRedrawLock(UINT message,
1204 ScopedRedrawLock lock(this);
1205 // The Widget and HWND can be destroyed in the call to DefWindowProc, so use
1206 // the WeakPtrFactory to avoid unlocking (and crashing) after destruction.
1207 base::WeakPtr<HWNDMessageHandler> ref(weak_factory_.GetWeakPtr());
1208 LRESULT result = DefWindowProc(hwnd(), message, w_param, l_param);
1210 lock.CancelUnlockOperation();
1214 void HWNDMessageHandler::NotifyOwnedWindowsParentClosing() {
1215 FindOwnedWindowsData data;
1216 data.window = hwnd();
1217 EnumThreadWindows(GetCurrentThreadId(), FindOwnedWindowsCallback,
1218 reinterpret_cast<LPARAM>(&data));
1219 for (size_t i = 0; i < data.owned_widgets.size(); ++i)
1220 data.owned_widgets[i]->OnOwnerClosing();
1223 void HWNDMessageHandler::LockUpdates(bool force) {
1224 // We skip locked updates when Aero is on for two reasons:
1225 // 1. Because it isn't necessary
1226 // 2. Because toggling the WS_VISIBLE flag may occur while the GPU process is
1227 // attempting to present a child window's backbuffer onscreen. When these
1228 // two actions race with one another, the child window will either flicker
1229 // or will simply stop updating entirely.
1230 if ((force || !ui::win::IsAeroGlassEnabled()) && ++lock_updates_count_ == 1) {
1231 SetWindowLong(hwnd(), GWL_STYLE,
1232 GetWindowLong(hwnd(), GWL_STYLE) & ~WS_VISIBLE);
1236 void HWNDMessageHandler::UnlockUpdates(bool force) {
1237 if ((force || !ui::win::IsAeroGlassEnabled()) && --lock_updates_count_ <= 0) {
1238 SetWindowLong(hwnd(), GWL_STYLE,
1239 GetWindowLong(hwnd(), GWL_STYLE) | WS_VISIBLE);
1240 lock_updates_count_ = 0;
1244 void HWNDMessageHandler::RedrawInvalidRect() {
1245 // TODO(cpu): Remove the caller and this class as a message loop observer
1246 // because we don't need agressive repaints via RDW_UPDATENOW in Aura. The
1247 // general tracking bug for repaint issues is 177115.
1248 #if !defined(USE_AURA)
1249 if (!use_layered_buffer_) {
1250 RECT r = { 0, 0, 0, 0 };
1251 if (GetUpdateRect(hwnd(), &r, FALSE) && !IsRectEmpty(&r)) {
1252 RedrawWindow(hwnd(), &r, NULL,
1253 RDW_INVALIDATE | RDW_UPDATENOW | RDW_NOCHILDREN);
1259 void HWNDMessageHandler::RedrawLayeredWindowContents() {
1260 waiting_for_redraw_layered_window_contents_ = false;
1261 if (invalid_rect_.IsEmpty())
1264 // We need to clip to the dirty rect ourselves.
1265 layered_window_contents_->sk_canvas()->save(SkCanvas::kClip_SaveFlag);
1266 double scale = gfx::win::GetDeviceScaleFactor();
1267 layered_window_contents_->sk_canvas()->scale(
1268 SkScalar(scale),SkScalar(scale));
1269 layered_window_contents_->ClipRect(invalid_rect_);
1270 delegate_->PaintLayeredWindow(layered_window_contents_.get());
1271 layered_window_contents_->sk_canvas()->scale(
1272 SkScalar(1.0/scale),SkScalar(1.0/scale));
1273 layered_window_contents_->sk_canvas()->restore();
1276 GetWindowRect(hwnd(), &wr);
1277 SIZE size = {wr.right - wr.left, wr.bottom - wr.top};
1278 POINT position = {wr.left, wr.top};
1279 HDC dib_dc = skia::BeginPlatformPaint(layered_window_contents_->sk_canvas());
1280 POINT zero = {0, 0};
1281 BLENDFUNCTION blend = {AC_SRC_OVER, 0, layered_alpha_, AC_SRC_ALPHA};
1282 UpdateLayeredWindow(hwnd(), NULL, &position, &size, dib_dc, &zero,
1283 RGB(0xFF, 0xFF, 0xFF), &blend, ULW_ALPHA);
1284 invalid_rect_.SetRect(0, 0, 0, 0);
1285 skia::EndPlatformPaint(layered_window_contents_->sk_canvas());
1288 void HWNDMessageHandler::ForceRedrawWindow(int attempts) {
1289 if (ui::IsWorkstationLocked()) {
1290 // Presents will continue to fail as long as the input desktop is
1292 if (--attempts <= 0)
1294 base::MessageLoop::current()->PostDelayedTask(
1296 base::Bind(&HWNDMessageHandler::ForceRedrawWindow,
1297 weak_factory_.GetWeakPtr(),
1299 base::TimeDelta::FromMilliseconds(500));
1302 InvalidateRect(hwnd(), NULL, FALSE);
1305 // Message handlers ------------------------------------------------------------
1307 void HWNDMessageHandler::OnActivateApp(BOOL active, DWORD thread_id) {
1308 if (delegate_->IsWidgetWindow() && !active &&
1309 thread_id != GetCurrentThreadId()) {
1310 delegate_->HandleAppDeactivated();
1311 // Also update the native frame if it is rendering the non-client area.
1312 if (!remove_standard_frame_ && !delegate_->IsUsingCustomFrame())
1313 DefWindowProcWithRedrawLock(WM_NCACTIVATE, FALSE, 0);
1317 BOOL HWNDMessageHandler::OnAppCommand(HWND window,
1321 BOOL handled = !!delegate_->HandleAppCommand(command);
1322 SetMsgHandled(handled);
1323 // Make sure to return TRUE if the event was handled or in some cases the
1324 // system will execute the default handler which can cause bugs like going
1325 // forward or back two pages instead of one.
1329 void HWNDMessageHandler::OnCancelMode() {
1330 delegate_->HandleCancelMode();
1331 // Need default handling, otherwise capture and other things aren't canceled.
1332 SetMsgHandled(FALSE);
1335 void HWNDMessageHandler::OnCaptureChanged(HWND window) {
1336 delegate_->HandleCaptureLost();
1339 void HWNDMessageHandler::OnClose() {
1340 delegate_->HandleClose();
1343 void HWNDMessageHandler::OnCommand(UINT notification_code,
1346 // If the notification code is > 1 it means it is control specific and we
1347 // should ignore it.
1348 if (notification_code > 1 || delegate_->HandleAppCommand(command))
1349 SetMsgHandled(FALSE);
1352 LRESULT HWNDMessageHandler::OnCreate(CREATESTRUCT* create_struct) {
1353 use_layered_buffer_ = !!(window_ex_style() & WS_EX_LAYERED);
1355 #if defined(USE_AURA)
1356 if (window_ex_style() & WS_EX_COMPOSITED) {
1357 if (base::win::GetVersion() >= base::win::VERSION_VISTA) {
1358 // This is part of the magic to emulate layered windows with Aura
1359 // see the explanation elsewere when we set WS_EX_COMPOSITED style.
1360 MARGINS margins = {-1,-1,-1,-1};
1361 DwmExtendFrameIntoClientArea(hwnd(), &margins);
1366 fullscreen_handler_->set_hwnd(hwnd());
1368 // This message initializes the window so that focus border are shown for
1372 MAKELPARAM(UIS_CLEAR, UISF_HIDEFOCUS),
1375 if (remove_standard_frame_) {
1376 SetWindowLong(hwnd(), GWL_STYLE,
1377 GetWindowLong(hwnd(), GWL_STYLE) & ~WS_CAPTION);
1381 // Get access to a modifiable copy of the system menu.
1382 GetSystemMenu(hwnd(), false);
1384 if (base::win::GetVersion() >= base::win::VERSION_WIN7 &&
1385 ui::AreTouchEventsEnabled())
1386 RegisterTouchWindow(hwnd(), TWF_WANTPALM);
1388 // We need to allow the delegate to size its contents since the window may not
1389 // receive a size notification when its initial bounds are specified at window
1391 ClientAreaSizeChanged();
1393 #if !defined(USE_AURA)
1394 // We need to add ourselves as a message loop observer so that we can repaint
1395 // aggressively if the contents of our window become invalid. Unfortunately
1396 // WM_PAINT messages are starved and we get flickery redrawing when resizing
1397 // if we do not do this.
1398 base::MessageLoopForUI::current()->AddObserver(this);
1401 delegate_->HandleCreate();
1403 WTSRegisterSessionNotification(hwnd(), NOTIFY_FOR_THIS_SESSION);
1405 // TODO(beng): move more of NWW::OnCreate here.
1409 void HWNDMessageHandler::OnDestroy() {
1410 WTSUnRegisterSessionNotification(hwnd());
1411 delegate_->HandleDestroying();
1414 void HWNDMessageHandler::OnDisplayChange(UINT bits_per_pixel,
1415 const CSize& screen_size) {
1416 delegate_->HandleDisplayChange();
1419 LRESULT HWNDMessageHandler::OnDwmCompositionChanged(UINT msg,
1422 if (!delegate_->IsWidgetWindow()) {
1423 SetMsgHandled(FALSE);
1431 void HWNDMessageHandler::OnEnterMenuLoop(BOOL from_track_popup_menu) {
1432 if (menu_depth_++ == 0)
1433 delegate_->HandleMenuLoop(true);
1436 void HWNDMessageHandler::OnEnterSizeMove() {
1437 // Please refer to the comments in the OnSize function about the scrollbar
1439 // Hide the Windows scrollbar if the scroll styles are present to ensure
1440 // that a paint flicker does not occur while sizing.
1441 if (in_size_loop_ && needs_scroll_styles_)
1442 ShowScrollBar(hwnd(), SB_BOTH, FALSE);
1444 delegate_->HandleBeginWMSizeMove();
1445 SetMsgHandled(FALSE);
1448 LRESULT HWNDMessageHandler::OnEraseBkgnd(HDC dc) {
1449 // Needed to prevent resize flicker.
1453 void HWNDMessageHandler::OnExitMenuLoop(BOOL is_shortcut_menu) {
1454 if (--menu_depth_ == 0)
1455 delegate_->HandleMenuLoop(false);
1456 DCHECK_GE(0, menu_depth_);
1459 void HWNDMessageHandler::OnExitSizeMove() {
1460 delegate_->HandleEndWMSizeMove();
1461 SetMsgHandled(FALSE);
1462 // Please refer to the notes in the OnSize function for information about
1463 // the scrolling hack.
1464 // We hide the Windows scrollbar in the OnEnterSizeMove function. We need
1465 // to add the scroll styles back to ensure that scrolling works in legacy
1466 // trackpoint drivers.
1467 if (in_size_loop_ && needs_scroll_styles_)
1468 AddScrollStylesToWindow(hwnd());
1471 void HWNDMessageHandler::OnGetMinMaxInfo(MINMAXINFO* minmax_info) {
1472 gfx::Size min_window_size;
1473 gfx::Size max_window_size;
1474 delegate_->GetMinMaxSize(&min_window_size, &max_window_size);
1476 // Add the native frame border size to the minimum and maximum size if the
1477 // view reports its size as the client size.
1478 if (delegate_->WidgetSizeIsClientSize()) {
1479 CRect client_rect, window_rect;
1480 GetClientRect(hwnd(), &client_rect);
1481 GetWindowRect(hwnd(), &window_rect);
1482 window_rect -= client_rect;
1483 min_window_size.Enlarge(window_rect.Width(), window_rect.Height());
1484 if (!max_window_size.IsEmpty())
1485 max_window_size.Enlarge(window_rect.Width(), window_rect.Height());
1487 minmax_info->ptMinTrackSize.x = min_window_size.width();
1488 minmax_info->ptMinTrackSize.y = min_window_size.height();
1489 if (max_window_size.width() || max_window_size.height()) {
1490 if (!max_window_size.width())
1491 max_window_size.set_width(GetSystemMetrics(SM_CXMAXTRACK));
1492 if (!max_window_size.height())
1493 max_window_size.set_height(GetSystemMetrics(SM_CYMAXTRACK));
1494 minmax_info->ptMaxTrackSize.x = max_window_size.width();
1495 minmax_info->ptMaxTrackSize.y = max_window_size.height();
1497 SetMsgHandled(FALSE);
1500 LRESULT HWNDMessageHandler::OnGetObject(UINT message,
1503 LRESULT reference_result = static_cast<LRESULT>(0L);
1505 // Accessibility readers will send an OBJID_CLIENT message
1506 if (OBJID_CLIENT == l_param) {
1507 // Retrieve MSAA dispatch object for the root view.
1508 base::win::ScopedComPtr<IAccessible> root(
1509 delegate_->GetNativeViewAccessible());
1511 // Create a reference that MSAA will marshall to the client.
1512 reference_result = LresultFromObject(IID_IAccessible, w_param,
1513 static_cast<IAccessible*>(root.Detach()));
1516 return reference_result;
1519 LRESULT HWNDMessageHandler::OnImeMessages(UINT message,
1523 SetMsgHandled(delegate_->HandleIMEMessage(
1524 message, w_param, l_param, &result));
1528 void HWNDMessageHandler::OnInitMenu(HMENU menu) {
1529 bool is_fullscreen = fullscreen_handler_->fullscreen();
1530 bool is_minimized = IsMinimized();
1531 bool is_maximized = IsMaximized();
1532 bool is_restored = !is_fullscreen && !is_minimized && !is_maximized;
1534 ScopedRedrawLock lock(this);
1535 EnableMenuItemByCommand(menu, SC_RESTORE, delegate_->CanResize() &&
1536 (is_minimized || is_maximized));
1537 EnableMenuItemByCommand(menu, SC_MOVE, is_restored);
1538 EnableMenuItemByCommand(menu, SC_SIZE, delegate_->CanResize() && is_restored);
1539 EnableMenuItemByCommand(menu, SC_MAXIMIZE, delegate_->CanMaximize() &&
1540 !is_fullscreen && !is_maximized);
1541 EnableMenuItemByCommand(menu, SC_MINIMIZE, !is_minimized);
1543 if (is_maximized && delegate_->CanResize())
1544 ::SetMenuDefaultItem(menu, SC_RESTORE, FALSE);
1545 else if (!is_maximized && delegate_->CanMaximize())
1546 ::SetMenuDefaultItem(menu, SC_MAXIMIZE, FALSE);
1549 void HWNDMessageHandler::OnInputLangChange(DWORD character_set,
1550 HKL input_language_id) {
1551 delegate_->HandleInputLanguageChange(character_set, input_language_id);
1554 LRESULT HWNDMessageHandler::OnKeyEvent(UINT message,
1557 MSG msg = { hwnd(), message, w_param, l_param, GetMessageTime() };
1558 ui::KeyEvent key(msg, message == WM_CHAR);
1559 if (!delegate_->HandleUntranslatedKeyEvent(key))
1560 DispatchKeyEventPostIME(key);
1564 void HWNDMessageHandler::OnKillFocus(HWND focused_window) {
1565 delegate_->HandleNativeBlur(focused_window);
1566 SetMsgHandled(FALSE);
1569 LRESULT HWNDMessageHandler::OnMouseActivate(UINT message,
1572 #if defined(USE_AURA)
1573 // On Windows, if we select the menu item by touch and if the window at the
1574 // location is another window on the same thread, that window gets a
1575 // WM_MOUSEACTIVATE message and ends up activating itself, which is not
1576 // correct. We workaround this by setting a property on the window at the
1577 // current cursor location. We check for this property in our
1578 // WM_MOUSEACTIVATE handler and don't activate the window if the property is
1580 if (::GetProp(hwnd(), kIgnoreTouchMouseActivateForWindow)) {
1581 ::RemoveProp(hwnd(), kIgnoreTouchMouseActivateForWindow);
1582 return MA_NOACTIVATE;
1584 // A child window activation should be treated as if we lost activation.
1585 POINT cursor_pos = {0};
1586 ::GetCursorPos(&cursor_pos);
1587 ::ScreenToClient(hwnd(), &cursor_pos);
1588 HWND child = ::RealChildWindowFromPoint(hwnd(), cursor_pos);
1589 if (::IsWindow(child) && child != hwnd() && ::IsWindowVisible(child))
1590 PostProcessActivateMessage(WA_INACTIVE, false);
1592 // TODO(beng): resolve this with the GetWindowLong() check on the subsequent
1594 if (delegate_->IsWidgetWindow())
1595 return delegate_->CanActivate() ? MA_ACTIVATE : MA_NOACTIVATEANDEAT;
1596 if (GetWindowLong(hwnd(), GWL_EXSTYLE) & WS_EX_NOACTIVATE)
1597 return MA_NOACTIVATE;
1598 SetMsgHandled(FALSE);
1602 LRESULT HWNDMessageHandler::OnMouseRange(UINT message,
1605 #if defined(USE_AURA)
1606 if (!touch_ids_.empty())
1608 // We handle touch events on Windows Aura. Windows generates synthesized
1609 // mouse messages in response to touch which we should ignore. However touch
1610 // messages are only received for the client area. We need to ignore the
1611 // synthesized mouse messages for all points in the client area and places
1612 // which return HTNOWHERE.
1613 if (ui::IsMouseEventFromTouch(message)) {
1614 LPARAM l_param_ht = l_param;
1615 // For mouse events (except wheel events), location is in window coordinates
1616 // and should be converted to screen coordinates for WM_NCHITTEST.
1617 if (message != WM_MOUSEWHEEL && message != WM_MOUSEHWHEEL) {
1618 CPoint screen_point(l_param_ht);
1619 MapWindowPoints(hwnd(), HWND_DESKTOP, &screen_point, 1);
1620 l_param_ht = MAKELPARAM(screen_point.x, screen_point.y);
1622 LRESULT hittest = SendMessage(hwnd(), WM_NCHITTEST, 0, l_param_ht);
1623 if (hittest == HTCLIENT || hittest == HTNOWHERE)
1627 if (message == WM_RBUTTONUP && is_right_mouse_pressed_on_caption_) {
1628 is_right_mouse_pressed_on_caption_ = false;
1630 // |point| is in window coordinates, but WM_NCHITTEST and TrackPopupMenu()
1631 // expect screen coordinates.
1632 CPoint screen_point(l_param);
1633 MapWindowPoints(hwnd(), HWND_DESKTOP, &screen_point, 1);
1634 w_param = SendMessage(hwnd(), WM_NCHITTEST, 0,
1635 MAKELPARAM(screen_point.x, screen_point.y));
1636 if (w_param == HTCAPTION || w_param == HTSYSMENU) {
1637 gfx::ShowSystemMenuAtPoint(hwnd(), gfx::Point(screen_point));
1640 } else if (message == WM_NCLBUTTONDOWN && delegate_->IsUsingCustomFrame()) {
1645 // When the mouse is pressed down in these specific non-client areas,
1646 // we need to tell the RootView to send the mouse pressed event (which
1647 // sets capture, allowing subsequent WM_LBUTTONUP (note, _not_
1648 // WM_NCLBUTTONUP) to fire so that the appropriate WM_SYSCOMMAND can be
1649 // sent by the applicable button's ButtonListener. We _have_ to do this
1650 // way rather than letting Windows just send the syscommand itself (as
1651 // would happen if we never did this dance) because for some insane
1652 // reason DefWindowProc for WM_NCLBUTTONDOWN also renders the pressed
1653 // window control button appearance, in the Windows classic style, over
1654 // our view! Ick! By handling this message we prevent Windows from
1655 // doing this undesirable thing, but that means we need to roll the
1656 // sys-command handling ourselves.
1657 // Combine |w_param| with common key state message flags.
1658 w_param |= base::win::IsCtrlPressed() ? MK_CONTROL : 0;
1659 w_param |= base::win::IsShiftPressed() ? MK_SHIFT : 0;
1662 } else if (message == WM_NCRBUTTONDOWN &&
1663 (w_param == HTCAPTION || w_param == HTSYSMENU)) {
1664 is_right_mouse_pressed_on_caption_ = true;
1665 // We SetCapture() to ensure we only show the menu when the button
1666 // down and up are both on the caption. Note: this causes the button up to
1667 // be WM_RBUTTONUP instead of WM_NCRBUTTONUP.
1671 MSG msg = { hwnd(), message, w_param, l_param, GetMessageTime(),
1672 { GET_X_LPARAM(l_param), GET_Y_LPARAM(l_param) } };
1673 ui::MouseEvent event(msg);
1674 if (!touch_ids_.empty() || ui::IsMouseEventFromTouch(message))
1675 event.set_flags(event.flags() | ui::EF_FROM_TOUCH);
1677 if (!(event.flags() & ui::EF_IS_NON_CLIENT))
1678 delegate_->HandleTooltipMouseMove(message, w_param, l_param);
1680 if (event.type() == ui::ET_MOUSE_MOVED && !HasCapture()) {
1681 // Windows only fires WM_MOUSELEAVE events if the application begins
1682 // "tracking" mouse events for a given HWND during WM_MOUSEMOVE events.
1683 // We need to call |TrackMouseEvents| to listen for WM_MOUSELEAVE.
1684 TrackMouseEvents((message == WM_NCMOUSEMOVE) ?
1685 TME_NONCLIENT | TME_LEAVE : TME_LEAVE);
1686 } else if (event.type() == ui::ET_MOUSE_EXITED) {
1687 // Reset our tracking flags so future mouse movement over this
1688 // NativeWidgetWin results in a new tracking session. Fall through for
1690 active_mouse_tracking_flags_ = 0;
1691 } else if (event.type() == ui::ET_MOUSEWHEEL) {
1692 // Reroute the mouse wheel to the window under the pointer if applicable.
1693 return (ui::RerouteMouseWheel(hwnd(), w_param, l_param) ||
1694 delegate_->HandleMouseEvent(ui::MouseWheelEvent(msg))) ? 0 : 1;
1697 // There are cases where the code handling the message destroys the window,
1698 // so use the weak ptr to check if destruction occured or not.
1699 base::WeakPtr<HWNDMessageHandler> ref(weak_factory_.GetWeakPtr());
1700 bool handled = delegate_->HandleMouseEvent(event);
1703 if (!handled && message == WM_NCLBUTTONDOWN && w_param != HTSYSMENU &&
1704 delegate_->IsUsingCustomFrame()) {
1705 // TODO(msw): Eliminate undesired painting, or re-evaluate this workaround.
1706 // DefWindowProc for WM_NCLBUTTONDOWN does weird non-client painting, so we
1707 // need to call it inside a ScopedRedrawLock. This may cause other negative
1708 // side-effects (ex/ stifling non-client mouse releases).
1709 DefWindowProcWithRedrawLock(message, w_param, l_param);
1714 SetMsgHandled(handled);
1718 void HWNDMessageHandler::OnMove(const CPoint& point) {
1719 delegate_->HandleMove();
1720 SetMsgHandled(FALSE);
1723 void HWNDMessageHandler::OnMoving(UINT param, const RECT* new_bounds) {
1724 delegate_->HandleMove();
1727 LRESULT HWNDMessageHandler::OnNCActivate(UINT message,
1730 // Per MSDN, w_param is either TRUE or FALSE. However, MSDN also hints that:
1731 // "If the window is minimized when this message is received, the application
1732 // should pass the message to the DefWindowProc function."
1733 // It is found out that the high word of w_param might be set when the window
1734 // is minimized or restored. To handle this, w_param's high word should be
1735 // cleared before it is converted to BOOL.
1736 BOOL active = static_cast<BOOL>(LOWORD(w_param));
1738 bool inactive_rendering_disabled = delegate_->IsInactiveRenderingDisabled();
1740 if (!delegate_->IsWidgetWindow()) {
1741 SetMsgHandled(FALSE);
1745 if (!delegate_->CanActivate())
1748 // On activation, lift any prior restriction against rendering as inactive.
1749 if (active && inactive_rendering_disabled)
1750 delegate_->EnableInactiveRendering();
1752 if (delegate_->IsUsingCustomFrame()) {
1753 // TODO(beng, et al): Hack to redraw this window and child windows
1754 // synchronously upon activation. Not all child windows are redrawing
1755 // themselves leading to issues like http://crbug.com/74604
1756 // We redraw out-of-process HWNDs asynchronously to avoid hanging the
1757 // whole app if a child HWND belonging to a hung plugin is encountered.
1758 RedrawWindow(hwnd(), NULL, NULL,
1759 RDW_NOCHILDREN | RDW_INVALIDATE | RDW_UPDATENOW);
1760 EnumChildWindows(hwnd(), EnumChildWindowsForRedraw, NULL);
1763 // The frame may need to redraw as a result of the activation change.
1764 // We can get WM_NCACTIVATE before we're actually visible. If we're not
1765 // visible, no need to paint.
1767 delegate_->SchedulePaint();
1769 // Avoid DefWindowProc non-client rendering over our custom frame on newer
1770 // Windows versions only (breaks taskbar activation indication on XP/Vista).
1771 if (delegate_->IsUsingCustomFrame() &&
1772 base::win::GetVersion() > base::win::VERSION_VISTA) {
1773 SetMsgHandled(TRUE);
1777 return DefWindowProcWithRedrawLock(
1778 WM_NCACTIVATE, inactive_rendering_disabled || active, 0);
1781 LRESULT HWNDMessageHandler::OnNCCalcSize(BOOL mode, LPARAM l_param) {
1782 // We only override the default handling if we need to specify a custom
1783 // non-client edge width. Note that in most cases "no insets" means no
1784 // custom width, but in fullscreen mode or when the NonClientFrameView
1785 // requests it, we want a custom width of 0.
1787 // Let User32 handle the first nccalcsize for captioned windows
1788 // so it updates its internal structures (specifically caption-present)
1789 // Without this Tile & Cascade windows won't work.
1790 // See http://code.google.com/p/chromium/issues/detail?id=900
1791 if (is_first_nccalc_) {
1792 is_first_nccalc_ = false;
1793 if (GetWindowLong(hwnd(), GWL_STYLE) & WS_CAPTION) {
1794 SetMsgHandled(FALSE);
1800 bool got_insets = GetClientAreaInsets(&insets);
1801 if (!got_insets && !fullscreen_handler_->fullscreen() &&
1802 !(mode && remove_standard_frame_)) {
1803 SetMsgHandled(FALSE);
1807 RECT* client_rect = mode ?
1808 &(reinterpret_cast<NCCALCSIZE_PARAMS*>(l_param)->rgrc[0]) :
1809 reinterpret_cast<RECT*>(l_param);
1810 client_rect->left += insets.left();
1811 client_rect->top += insets.top();
1812 client_rect->bottom -= insets.bottom();
1813 client_rect->right -= insets.right();
1814 if (IsMaximized()) {
1815 // Find all auto-hide taskbars along the screen edges and adjust in by the
1816 // thickness of the auto-hide taskbar on each such edge, so the window isn't
1817 // treated as a "fullscreen app", which would cause the taskbars to
1819 HMONITOR monitor = MonitorFromWindow(hwnd(), MONITOR_DEFAULTTONULL);
1821 // We might end up here if the window was previously minimized and the
1822 // user clicks on the taskbar button to restore it in the previously
1823 // maximized position. In that case WM_NCCALCSIZE is sent before the
1824 // window coordinates are restored to their previous values, so our
1825 // (left,top) would probably be (-32000,-32000) like all minimized
1826 // windows. So the above MonitorFromWindow call fails, but if we check
1827 // the window rect given with WM_NCCALCSIZE (which is our previous
1828 // restored window position) we will get the correct monitor handle.
1829 monitor = MonitorFromRect(client_rect, MONITOR_DEFAULTTONULL);
1831 // This is probably an extreme case that we won't hit, but if we don't
1832 // intersect any monitor, let us not adjust the client rect since our
1833 // window will not be visible anyway.
1837 const int autohide_edges = GetAppbarAutohideEdges(monitor);
1838 if (autohide_edges & Appbar::EDGE_LEFT)
1839 client_rect->left += kAutoHideTaskbarThicknessPx;
1840 if (autohide_edges & Appbar::EDGE_TOP) {
1841 if (!delegate_->IsUsingCustomFrame()) {
1842 // Tricky bit. Due to a bug in DwmDefWindowProc()'s handling of
1843 // WM_NCHITTEST, having any nonclient area atop the window causes the
1844 // caption buttons to draw onscreen but not respond to mouse
1846 // So for a taskbar at the screen top, we can't push the
1847 // client_rect->top down; instead, we move the bottom up by one pixel,
1848 // which is the smallest change we can make and still get a client area
1849 // less than the screen size. This is visibly ugly, but there seems to
1850 // be no better solution.
1851 --client_rect->bottom;
1853 client_rect->top += kAutoHideTaskbarThicknessPx;
1856 if (autohide_edges & Appbar::EDGE_RIGHT)
1857 client_rect->right -= kAutoHideTaskbarThicknessPx;
1858 if (autohide_edges & Appbar::EDGE_BOTTOM)
1859 client_rect->bottom -= kAutoHideTaskbarThicknessPx;
1861 // We cannot return WVR_REDRAW when there is nonclient area, or Windows
1862 // exhibits bugs where client pixels and child HWNDs are mispositioned by
1863 // the width/height of the upper-left nonclient area.
1867 // If the window bounds change, we're going to relayout and repaint anyway.
1868 // Returning WVR_REDRAW avoids an extra paint before that of the old client
1869 // pixels in the (now wrong) location, and thus makes actions like resizing a
1870 // window from the left edge look slightly less broken.
1871 // We special case when left or top insets are 0, since these conditions
1872 // actually require another repaint to correct the layout after glass gets
1873 // turned on and off.
1874 if (insets.left() == 0 || insets.top() == 0)
1876 return mode ? WVR_REDRAW : 0;
1879 LRESULT HWNDMessageHandler::OnNCHitTest(const CPoint& point) {
1880 if (!delegate_->IsWidgetWindow()) {
1881 SetMsgHandled(FALSE);
1885 // If the DWM is rendering the window controls, we need to give the DWM's
1886 // default window procedure first chance to handle hit testing.
1887 if (!remove_standard_frame_ && !delegate_->IsUsingCustomFrame()) {
1889 if (DwmDefWindowProc(hwnd(), WM_NCHITTEST, 0,
1890 MAKELPARAM(point.x, point.y), &result)) {
1895 // First, give the NonClientView a chance to test the point to see if it
1896 // provides any of the non-client area.
1898 MapWindowPoints(HWND_DESKTOP, hwnd(), &temp, 1);
1899 int component = delegate_->GetNonClientComponent(gfx::Point(temp));
1900 if (component != HTNOWHERE)
1903 // Otherwise, we let Windows do all the native frame non-client handling for
1905 #if defined(USE_AURA)
1906 LRESULT hit_test_code = DefWindowProc(hwnd(), WM_NCHITTEST, 0,
1907 MAKELPARAM(point.x, point.y));
1908 // If we faked the WS_VSCROLL and WS_HSCROLL styles for this window, then
1909 // Windows returns the HTVSCROLL or HTHSCROLL hit test codes if we hover or
1910 // click on the non client portions of the window where the OS scrollbars
1911 // would be drawn. These hittest codes are returned even when the scrollbars
1912 // are hidden, which is the case in Aura. We fake the hittest code as
1913 // HTCLIENT in this case to ensure that we receive client mouse messages as
1914 // opposed to non client mouse messages.
1915 if (needs_scroll_styles_ && (hit_test_code == HTVSCROLL ||
1916 hit_test_code == HTHSCROLL))
1917 hit_test_code = HTCLIENT;
1918 return hit_test_code;
1920 SetMsgHandled(FALSE);
1924 void HWNDMessageHandler::OnNCPaint(HRGN rgn) {
1925 // We only do non-client painting if we're not using the native frame.
1926 // It's required to avoid some native painting artifacts from appearing when
1927 // the window is resized.
1928 if (!delegate_->IsWidgetWindow() || !delegate_->IsUsingCustomFrame()) {
1929 SetMsgHandled(FALSE);
1933 // We have an NC region and need to paint it. We expand the NC region to
1934 // include the dirty region of the root view. This is done to minimize
1937 GetWindowRect(hwnd(), &window_rect);
1939 gfx::Size root_view_size = delegate_->GetRootViewSize();
1940 if (gfx::Size(window_rect.Width(), window_rect.Height()) != root_view_size) {
1941 // If the size of the window differs from the size of the root view it
1942 // means we're being asked to paint before we've gotten a WM_SIZE. This can
1943 // happen when the user is interactively resizing the window. To avoid
1944 // mass flickering we don't do anything here. Once we get the WM_SIZE we'll
1945 // reset the region of the window which triggers another WM_NCPAINT and
1951 // A value of 1 indicates paint all.
1952 if (!rgn || rgn == reinterpret_cast<HRGN>(1)) {
1953 dirty_region = CRect(0, 0, window_rect.Width(), window_rect.Height());
1955 RECT rgn_bounding_box;
1956 GetRgnBox(rgn, &rgn_bounding_box);
1957 if (!IntersectRect(&dirty_region, &rgn_bounding_box, &window_rect))
1958 return; // Dirty region doesn't intersect window bounds, bale.
1960 // rgn_bounding_box is in screen coordinates. Map it to window coordinates.
1961 OffsetRect(&dirty_region, -window_rect.left, -window_rect.top);
1964 // In theory GetDCEx should do what we want, but I couldn't get it to work.
1965 // In particular the docs mentiond DCX_CLIPCHILDREN, but as far as I can tell
1966 // it doesn't work at all. So, instead we get the DC for the window then
1967 // manually clip out the children.
1968 HDC dc = GetWindowDC(hwnd());
1969 ClipState clip_state;
1970 clip_state.x = window_rect.left;
1971 clip_state.y = window_rect.top;
1972 clip_state.parent = hwnd();
1974 EnumChildWindows(hwnd(), &ClipDCToChild,
1975 reinterpret_cast<LPARAM>(&clip_state));
1977 gfx::Rect old_paint_region = invalid_rect_;
1978 if (!old_paint_region.IsEmpty()) {
1979 // The root view has a region that needs to be painted. Include it in the
1980 // region we're going to paint.
1982 CRect old_paint_region_crect = old_paint_region.ToRECT();
1983 CRect tmp = dirty_region;
1984 UnionRect(&dirty_region, &tmp, &old_paint_region_crect);
1987 SchedulePaintInRect(gfx::Rect(dirty_region));
1989 // gfx::CanvasSkiaPaint's destructor does the actual painting. As such, wrap
1990 // the following in a block to force paint to occur so that we can release
1992 if (!delegate_->HandlePaintAccelerated(gfx::Rect(dirty_region))) {
1993 gfx::CanvasSkiaPaint canvas(dc, true, dirty_region.left,
1994 dirty_region.top, dirty_region.Width(),
1995 dirty_region.Height());
1996 delegate_->HandlePaint(&canvas);
1999 ReleaseDC(hwnd(), dc);
2000 // When using a custom frame, we want to avoid calling DefWindowProc() since
2001 // that may render artifacts.
2002 SetMsgHandled(delegate_->IsUsingCustomFrame());
2005 LRESULT HWNDMessageHandler::OnNCUAHDrawCaption(UINT message,
2008 // See comment in widget_win.h at the definition of WM_NCUAHDRAWCAPTION for
2009 // an explanation about why we need to handle this message.
2010 SetMsgHandled(delegate_->IsUsingCustomFrame());
2014 LRESULT HWNDMessageHandler::OnNCUAHDrawFrame(UINT message,
2017 // See comment in widget_win.h at the definition of WM_NCUAHDRAWCAPTION for
2018 // an explanation about why we need to handle this message.
2019 SetMsgHandled(delegate_->IsUsingCustomFrame());
2023 LRESULT HWNDMessageHandler::OnNotify(int w_param, NMHDR* l_param) {
2024 LRESULT l_result = 0;
2025 SetMsgHandled(delegate_->HandleTooltipNotify(w_param, l_param, &l_result));
2029 void HWNDMessageHandler::OnPaint(HDC dc) {
2030 // Call BeginPaint()/EndPaint() around the paint handling, as that seems
2031 // to do more to actually validate the window's drawing region. This only
2032 // appears to matter for Windows that have the WS_EX_COMPOSITED style set
2033 // but will be valid in general too.
2035 HDC display_dc = BeginPaint(hwnd(), &ps);
2038 // Try to paint accelerated first.
2039 if (!IsRectEmpty(&ps.rcPaint) &&
2040 !delegate_->HandlePaintAccelerated(gfx::Rect(ps.rcPaint))) {
2041 #if defined(USE_AURA)
2042 delegate_->HandlePaint(NULL);
2044 scoped_ptr<gfx::CanvasSkiaPaint> canvas(
2045 new gfx::CanvasSkiaPaint(hwnd(), display_dc, ps));
2046 delegate_->HandlePaint(canvas.get());
2050 EndPaint(hwnd(), &ps);
2053 LRESULT HWNDMessageHandler::OnReflectedMessage(UINT message,
2056 SetMsgHandled(FALSE);
2060 LRESULT HWNDMessageHandler::OnScrollMessage(UINT message,
2063 MSG msg = { hwnd(), message, w_param, l_param, GetMessageTime() };
2064 ui::ScrollEvent event(msg);
2065 delegate_->HandleScrollEvent(event);
2069 void HWNDMessageHandler::OnSessionChange(WPARAM status_code,
2070 PWTSSESSION_NOTIFICATION session_id) {
2071 // Direct3D presents are ignored while the screen is locked, so force the
2072 // window to be redrawn on unlock.
2073 if (status_code == WTS_SESSION_UNLOCK)
2074 ForceRedrawWindow(10);
2076 SetMsgHandled(FALSE);
2079 LRESULT HWNDMessageHandler::OnSetCursor(UINT message,
2082 // Reimplement the necessary default behavior here. Calling DefWindowProc can
2083 // trigger weird non-client painting for non-glass windows with custom frames.
2084 // Using a ScopedRedrawLock to prevent caption rendering artifacts may allow
2085 // content behind this window to incorrectly paint in front of this window.
2086 // Invalidating the window to paint over either set of artifacts is not ideal.
2087 wchar_t* cursor = IDC_ARROW;
2088 switch (LOWORD(l_param)) {
2090 cursor = IDC_SIZENWSE;
2094 cursor = IDC_SIZEWE;
2098 cursor = IDC_SIZENS;
2102 cursor = IDC_SIZENWSE;
2106 cursor = IDC_SIZENESW;
2109 SetCursor(current_cursor_);
2112 // Use the default value, IDC_ARROW.
2115 ::SetCursor(LoadCursor(NULL, cursor));
2119 void HWNDMessageHandler::OnSetFocus(HWND last_focused_window) {
2120 delegate_->HandleNativeFocus(last_focused_window);
2121 SetMsgHandled(FALSE);
2124 LRESULT HWNDMessageHandler::OnSetIcon(UINT size_type, HICON new_icon) {
2125 // Use a ScopedRedrawLock to avoid weird non-client painting.
2126 return DefWindowProcWithRedrawLock(WM_SETICON, size_type,
2127 reinterpret_cast<LPARAM>(new_icon));
2130 LRESULT HWNDMessageHandler::OnSetText(const wchar_t* text) {
2131 // Use a ScopedRedrawLock to avoid weird non-client painting.
2132 return DefWindowProcWithRedrawLock(WM_SETTEXT, NULL,
2133 reinterpret_cast<LPARAM>(text));
2136 void HWNDMessageHandler::OnSettingChange(UINT flags, const wchar_t* section) {
2137 if (!GetParent(hwnd()) && (flags == SPI_SETWORKAREA) &&
2138 !delegate_->WillProcessWorkAreaChange()) {
2139 // Fire a dummy SetWindowPos() call, so we'll trip the code in
2140 // OnWindowPosChanging() below that notices work area changes.
2141 ::SetWindowPos(hwnd(), 0, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE |
2142 SWP_NOZORDER | SWP_NOREDRAW | SWP_NOACTIVATE | SWP_NOOWNERZORDER);
2143 SetMsgHandled(TRUE);
2145 if (flags == SPI_SETWORKAREA)
2146 delegate_->HandleWorkAreaChanged();
2147 SetMsgHandled(FALSE);
2151 void HWNDMessageHandler::OnSize(UINT param, const CSize& size) {
2152 RedrawWindow(hwnd(), NULL, NULL, RDW_INVALIDATE | RDW_ALLCHILDREN);
2153 // ResetWindowRegion is going to trigger WM_NCPAINT. By doing it after we've
2154 // invoked OnSize we ensure the RootView has been laid out.
2155 ResetWindowRegion(false, true);
2157 #if defined(USE_AURA)
2158 // We add the WS_VSCROLL and WS_HSCROLL styles to top level windows to ensure
2159 // that legacy trackpad/trackpoint drivers generate the WM_VSCROLL and
2160 // WM_HSCROLL messages and scrolling works.
2161 // We want the scroll styles to be present on the window. However we don't
2162 // want Windows to draw the scrollbars. To achieve this we hide the scroll
2163 // bars and readd them to the window style in a posted task to ensure that we
2164 // don't get nested WM_SIZE messages.
2165 if (needs_scroll_styles_ && !in_size_loop_) {
2166 ShowScrollBar(hwnd(), SB_BOTH, FALSE);
2167 base::MessageLoop::current()->PostTask(
2168 FROM_HERE, base::Bind(&AddScrollStylesToWindow, hwnd()));
2173 void HWNDMessageHandler::OnSysCommand(UINT notification_code,
2174 const CPoint& point) {
2175 if (!delegate_->ShouldHandleSystemCommands())
2178 // Windows uses the 4 lower order bits of |notification_code| for type-
2179 // specific information so we must exclude this when comparing.
2180 static const int sc_mask = 0xFFF0;
2181 // Ignore size/move/maximize in fullscreen mode.
2182 if (fullscreen_handler_->fullscreen() &&
2183 (((notification_code & sc_mask) == SC_SIZE) ||
2184 ((notification_code & sc_mask) == SC_MOVE) ||
2185 ((notification_code & sc_mask) == SC_MAXIMIZE)))
2187 if (delegate_->IsUsingCustomFrame()) {
2188 if ((notification_code & sc_mask) == SC_MINIMIZE ||
2189 (notification_code & sc_mask) == SC_MAXIMIZE ||
2190 (notification_code & sc_mask) == SC_RESTORE) {
2191 delegate_->ResetWindowControls();
2192 } else if ((notification_code & sc_mask) == SC_MOVE ||
2193 (notification_code & sc_mask) == SC_SIZE) {
2195 // Circumvent ScopedRedrawLocks and force visibility before entering a
2196 // resize or move modal loop to get continuous sizing/moving feedback.
2197 SetWindowLong(hwnd(), GWL_STYLE,
2198 GetWindowLong(hwnd(), GWL_STYLE) | WS_VISIBLE);
2203 // Handle SC_KEYMENU, which means that the user has pressed the ALT
2204 // key and released it, so we should focus the menu bar.
2205 if ((notification_code & sc_mask) == SC_KEYMENU && point.x == 0) {
2206 int modifiers = ui::EF_NONE;
2207 if (base::win::IsShiftPressed())
2208 modifiers |= ui::EF_SHIFT_DOWN;
2209 if (base::win::IsCtrlPressed())
2210 modifiers |= ui::EF_CONTROL_DOWN;
2211 // Retrieve the status of shift and control keys to prevent consuming
2212 // shift+alt keys, which are used by Windows to change input languages.
2213 ui::Accelerator accelerator(ui::KeyboardCodeForWindowsKeyCode(VK_MENU),
2215 delegate_->HandleAccelerator(accelerator);
2219 // If the delegate can't handle it, the system implementation will be called.
2220 if (!delegate_->HandleCommand(notification_code)) {
2221 // If the window is being resized by dragging the borders of the window
2222 // with the mouse/touch/keyboard, we flag as being in a size loop.
2223 if ((notification_code & sc_mask) == SC_SIZE)
2224 in_size_loop_ = true;
2225 DefWindowProc(hwnd(), WM_SYSCOMMAND, notification_code,
2226 MAKELPARAM(point.x, point.y));
2227 in_size_loop_ = false;
2231 void HWNDMessageHandler::OnThemeChanged() {
2232 ui::NativeThemeWin::instance()->CloseHandles();
2235 LRESULT HWNDMessageHandler::OnTouchEvent(UINT message,
2238 // Handle touch events only on Aura for now.
2239 #if !defined(USE_AURA)
2240 SetMsgHandled(FALSE);
2243 int num_points = LOWORD(w_param);
2244 scoped_ptr<TOUCHINPUT[]> input(new TOUCHINPUT[num_points]);
2245 if (ui::GetTouchInputInfoWrapper(reinterpret_cast<HTOUCHINPUT>(l_param),
2246 num_points, input.get(),
2247 sizeof(TOUCHINPUT))) {
2248 int flags = ui::GetModifiersFromKeyState();
2249 TouchEvents touch_events;
2250 for (int i = 0; i < num_points; ++i) {
2251 ui::EventType touch_event_type = ui::ET_UNKNOWN;
2253 if (input[i].dwFlags & TOUCHEVENTF_DOWN) {
2254 touch_ids_.insert(input[i].dwID);
2255 touch_event_type = ui::ET_TOUCH_PRESSED;
2256 } else if (input[i].dwFlags & TOUCHEVENTF_UP) {
2257 touch_ids_.erase(input[i].dwID);
2258 touch_event_type = ui::ET_TOUCH_RELEASED;
2259 } else if (input[i].dwFlags & TOUCHEVENTF_MOVE) {
2260 touch_event_type = ui::ET_TOUCH_MOVED;
2262 if (touch_event_type != ui::ET_UNKNOWN) {
2264 point.x = TOUCH_COORD_TO_PIXEL(input[i].x) /
2265 gfx::win::GetUndocumentedDPITouchScale();
2266 point.y = TOUCH_COORD_TO_PIXEL(input[i].y) /
2267 gfx::win::GetUndocumentedDPITouchScale();
2269 ScreenToClient(hwnd(), &point);
2271 ui::TouchEvent event(
2273 gfx::Point(point.x, point.y),
2274 id_generator_.GetGeneratedID(input[i].dwID),
2275 base::TimeDelta::FromMilliseconds(input[i].dwTime));
2276 event.set_flags(flags);
2277 touch_events.push_back(event);
2278 if (touch_event_type == ui::ET_TOUCH_RELEASED)
2279 id_generator_.ReleaseNumber(input[i].dwID);
2282 // Handle the touch events asynchronously. We need this because touch
2283 // events on windows don't fire if we enter a modal loop in the context of
2285 base::MessageLoop::current()->PostTask(
2287 base::Bind(&HWNDMessageHandler::HandleTouchEvents,
2288 weak_factory_.GetWeakPtr(), touch_events));
2290 CloseTouchInputHandle(reinterpret_cast<HTOUCHINPUT>(l_param));
2291 SetMsgHandled(FALSE);
2295 void HWNDMessageHandler::OnWindowPosChanging(WINDOWPOS* window_pos) {
2296 if (ignore_window_pos_changes_) {
2297 // If somebody's trying to toggle our visibility, change the nonclient area,
2298 // change our Z-order, or activate us, we should probably let it go through.
2299 if (!(window_pos->flags & ((IsVisible() ? SWP_HIDEWINDOW : SWP_SHOWWINDOW) |
2300 SWP_FRAMECHANGED)) &&
2301 (window_pos->flags & (SWP_NOZORDER | SWP_NOACTIVATE))) {
2302 // Just sizing/moving the window; ignore.
2303 window_pos->flags |= SWP_NOSIZE | SWP_NOMOVE | SWP_NOREDRAW;
2304 window_pos->flags &= ~(SWP_SHOWWINDOW | SWP_HIDEWINDOW);
2306 } else if (!GetParent(hwnd())) {
2309 gfx::Rect monitor_rect, work_area;
2310 if (GetWindowRect(hwnd(), &window_rect) &&
2311 GetMonitorAndRects(window_rect, &monitor, &monitor_rect, &work_area)) {
2312 bool work_area_changed = (monitor_rect == last_monitor_rect_) &&
2313 (work_area != last_work_area_);
2314 if (monitor && (monitor == last_monitor_) &&
2315 ((fullscreen_handler_->fullscreen() &&
2316 !fullscreen_handler_->metro_snap()) ||
2317 work_area_changed)) {
2318 // A rect for the monitor we're on changed. Normally Windows notifies
2319 // us about this (and thus we're reaching here due to the SetWindowPos()
2320 // call in OnSettingChange() above), but with some software (e.g.
2321 // nVidia's nView desktop manager) the work area can change asynchronous
2322 // to any notification, and we're just sent a SetWindowPos() call with a
2323 // new (frequently incorrect) position/size. In either case, the best
2324 // response is to throw away the existing position/size information in
2325 // |window_pos| and recalculate it based on the new work rect.
2326 gfx::Rect new_window_rect;
2327 if (fullscreen_handler_->fullscreen()) {
2328 new_window_rect = monitor_rect;
2329 } else if (IsMaximized()) {
2330 new_window_rect = work_area;
2331 int border_thickness = GetSystemMetrics(SM_CXSIZEFRAME);
2332 new_window_rect.Inset(-border_thickness, -border_thickness);
2334 new_window_rect = gfx::Rect(window_rect);
2335 new_window_rect.AdjustToFit(work_area);
2337 window_pos->x = new_window_rect.x();
2338 window_pos->y = new_window_rect.y();
2339 window_pos->cx = new_window_rect.width();
2340 window_pos->cy = new_window_rect.height();
2341 // WARNING! Don't set SWP_FRAMECHANGED here, it breaks moving the child
2342 // HWNDs for some reason.
2343 window_pos->flags &= ~(SWP_NOSIZE | SWP_NOMOVE | SWP_NOREDRAW);
2344 window_pos->flags |= SWP_NOCOPYBITS;
2346 // Now ignore all immediately-following SetWindowPos() changes. Windows
2347 // likes to (incorrectly) recalculate what our position/size should be
2348 // and send us further updates.
2349 ignore_window_pos_changes_ = true;
2350 base::MessageLoop::current()->PostTask(
2352 base::Bind(&HWNDMessageHandler::StopIgnoringPosChanges,
2353 weak_factory_.GetWeakPtr()));
2355 last_monitor_ = monitor;
2356 last_monitor_rect_ = monitor_rect;
2357 last_work_area_ = work_area;
2361 if (ScopedFullscreenVisibility::IsHiddenForFullscreen(hwnd())) {
2362 // Prevent the window from being made visible if we've been asked to do so.
2363 // See comment in header as to why we might want this.
2364 window_pos->flags &= ~SWP_SHOWWINDOW;
2367 if (window_pos->flags & SWP_SHOWWINDOW)
2368 delegate_->HandleVisibilityChanging(true);
2369 else if (window_pos->flags & SWP_HIDEWINDOW)
2370 delegate_->HandleVisibilityChanging(false);
2372 SetMsgHandled(FALSE);
2375 void HWNDMessageHandler::OnWindowPosChanged(WINDOWPOS* window_pos) {
2376 if (DidClientAreaSizeChange(window_pos))
2377 ClientAreaSizeChanged();
2378 if (remove_standard_frame_ && window_pos->flags & SWP_FRAMECHANGED &&
2379 ui::win::IsAeroGlassEnabled() &&
2380 (window_ex_style() & WS_EX_COMPOSITED) == 0) {
2381 MARGINS m = {10, 10, 10, 10};
2382 DwmExtendFrameIntoClientArea(hwnd(), &m);
2384 if (window_pos->flags & SWP_SHOWWINDOW)
2385 delegate_->HandleVisibilityChanged(true);
2386 else if (window_pos->flags & SWP_HIDEWINDOW)
2387 delegate_->HandleVisibilityChanged(false);
2388 SetMsgHandled(FALSE);
2391 void HWNDMessageHandler::HandleTouchEvents(const TouchEvents& touch_events) {
2392 base::WeakPtr<HWNDMessageHandler> ref(weak_factory_.GetWeakPtr());
2393 for (size_t i = 0; i < touch_events.size() && ref; ++i)
2394 delegate_->HandleTouchEvent(touch_events[i]);
2397 } // namespace views