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"
11 #pragma comment(lib, "wtsapi32.lib")
13 #include "base/bind.h"
14 #include "base/debug/trace_event.h"
15 #include "base/win/win_util.h"
16 #include "base/win/windows_version.h"
17 #include "ui/base/touch/touch_enabled.h"
18 #include "ui/base/win/lock_state.h"
19 #include "ui/base/win/mouse_wheel_util.h"
20 #include "ui/base/win/shell.h"
21 #include "ui/base/win/touch_input.h"
22 #include "ui/events/event.h"
23 #include "ui/events/event_utils.h"
24 #include "ui/events/gestures/gesture_sequence.h"
25 #include "ui/events/keycodes/keyboard_code_conversion_win.h"
26 #include "ui/gfx/canvas.h"
27 #include "ui/gfx/canvas_skia_paint.h"
28 #include "ui/gfx/icon_util.h"
29 #include "ui/gfx/insets.h"
30 #include "ui/gfx/path.h"
31 #include "ui/gfx/path_win.h"
32 #include "ui/gfx/screen.h"
33 #include "ui/gfx/win/dpi.h"
34 #include "ui/gfx/win/hwnd_util.h"
35 #include "ui/native_theme/native_theme_win.h"
36 #include "ui/views/views_delegate.h"
37 #include "ui/views/widget/monitor_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 // Remove the scrolling hack code once we have scrolling working well.
433 #if defined(ENABLE_SCROLL_HACK)
434 // Certain trackpad drivers on Windows have bugs where in they don't generate
435 // WM_MOUSEWHEEL messages for the trackpoint and trackpad scrolling gestures
436 // unless there is an entry for Chrome with the class name of the Window.
437 // These drivers check if the window under the trackpoint has the WS_VSCROLL/
438 // WS_HSCROLL style and if yes they generate the legacy WM_VSCROLL/WM_HSCROLL
439 // messages. We add these styles to ensure that trackpad/trackpoint scrolling
442 // Look into moving the WS_VSCROLL and WS_HSCROLL style setting logic to the
443 // CalculateWindowStylesFromInitParams function. Doing it there seems to
444 // cause some interactive tests to fail. Investigation needed.
445 if (IsTopLevelWindow(hwnd())) {
446 long current_style = ::GetWindowLong(hwnd(), GWL_STYLE);
447 if (!(current_style & WS_POPUP)) {
448 AddScrollStylesToWindow(hwnd());
449 needs_scroll_styles_ = true;
455 void HWNDMessageHandler::InitModalType(ui::ModalType modal_type) {
456 if (modal_type == ui::MODAL_TYPE_NONE)
458 // We implement modality by crawling up the hierarchy of windows starting
459 // at the owner, disabling all of them so that they don't receive input
461 HWND start = ::GetWindow(hwnd(), GW_OWNER);
463 ::EnableWindow(start, FALSE);
464 start = ::GetParent(start);
468 void HWNDMessageHandler::Close() {
469 if (!IsWindow(hwnd()))
470 return; // No need to do anything.
472 // Let's hide ourselves right away.
475 // Modal dialog windows disable their owner windows; re-enable them now so
476 // they can activate as foreground windows upon this window's destruction.
477 RestoreEnabledIfNecessary();
479 if (!waiting_for_close_now_) {
480 // And we delay the close so that if we are called from an ATL callback,
481 // we don't destroy the window before the callback returned (as the caller
482 // may delete ourselves on destroy and the ATL callback would still
483 // dereference us when the callback returns).
484 waiting_for_close_now_ = true;
485 base::MessageLoop::current()->PostTask(
487 base::Bind(&HWNDMessageHandler::CloseNow, weak_factory_.GetWeakPtr()));
491 void HWNDMessageHandler::CloseNow() {
492 // We may already have been destroyed if the selection resulted in a tab
493 // switch which will have reactivated the browser window and closed us, so
494 // we need to check to see if we're still a window before trying to destroy
496 waiting_for_close_now_ = false;
497 if (IsWindow(hwnd()))
498 DestroyWindow(hwnd());
501 gfx::Rect HWNDMessageHandler::GetWindowBoundsInScreen() const {
503 GetWindowRect(hwnd(), &r);
507 gfx::Rect HWNDMessageHandler::GetClientAreaBoundsInScreen() const {
509 GetClientRect(hwnd(), &r);
510 POINT point = { r.left, r.top };
511 ClientToScreen(hwnd(), &point);
512 return gfx::Rect(point.x, point.y, r.right - r.left, r.bottom - r.top);
515 gfx::Rect HWNDMessageHandler::GetRestoredBounds() const {
516 // If we're in fullscreen mode, we've changed the normal bounds to the monitor
517 // rect, so return the saved bounds instead.
518 if (fullscreen_handler_->fullscreen())
519 return fullscreen_handler_->GetRestoreBounds();
522 GetWindowPlacement(&bounds, NULL);
526 gfx::Rect HWNDMessageHandler::GetClientAreaBounds() const {
529 if (delegate_->WidgetSizeIsClientSize())
530 return GetClientAreaBoundsInScreen();
531 return GetWindowBoundsInScreen();
534 void HWNDMessageHandler::GetWindowPlacement(
536 ui::WindowShowState* show_state) const {
538 wp.length = sizeof(wp);
539 const bool succeeded = !!::GetWindowPlacement(hwnd(), &wp);
542 if (bounds != NULL) {
543 if (wp.showCmd == SW_SHOWNORMAL) {
544 // GetWindowPlacement can return misleading position if a normalized
545 // window was resized using Aero Snap feature (see comment 9 in bug
546 // 36421). As a workaround, using GetWindowRect for normalized windows.
547 const bool succeeded = GetWindowRect(hwnd(), &wp.rcNormalPosition) != 0;
550 *bounds = gfx::Rect(wp.rcNormalPosition);
553 mi.cbSize = sizeof(mi);
554 const bool succeeded = GetMonitorInfo(
555 MonitorFromWindow(hwnd(), MONITOR_DEFAULTTONEAREST), &mi) != 0;
558 *bounds = gfx::Rect(wp.rcNormalPosition);
559 // Convert normal position from workarea coordinates to screen
561 bounds->Offset(mi.rcWork.left - mi.rcMonitor.left,
562 mi.rcWork.top - mi.rcMonitor.top);
567 if (wp.showCmd == SW_SHOWMAXIMIZED)
568 *show_state = ui::SHOW_STATE_MAXIMIZED;
569 else if (wp.showCmd == SW_SHOWMINIMIZED)
570 *show_state = ui::SHOW_STATE_MINIMIZED;
572 *show_state = ui::SHOW_STATE_NORMAL;
576 void HWNDMessageHandler::SetBounds(const gfx::Rect& bounds_in_pixels) {
577 LONG style = GetWindowLong(hwnd(), GWL_STYLE);
578 if (style & WS_MAXIMIZE)
579 SetWindowLong(hwnd(), GWL_STYLE, style & ~WS_MAXIMIZE);
580 SetWindowPos(hwnd(), NULL, bounds_in_pixels.x(), bounds_in_pixels.y(),
581 bounds_in_pixels.width(), bounds_in_pixels.height(),
582 SWP_NOACTIVATE | SWP_NOZORDER);
585 void HWNDMessageHandler::SetSize(const gfx::Size& size) {
586 SetWindowPos(hwnd(), NULL, 0, 0, size.width(), size.height(),
587 SWP_NOACTIVATE | SWP_NOZORDER | SWP_NOMOVE);
590 void HWNDMessageHandler::CenterWindow(const gfx::Size& size) {
591 HWND parent = GetParent(hwnd());
592 if (!IsWindow(hwnd()))
593 parent = ::GetWindow(hwnd(), GW_OWNER);
594 gfx::CenterAndSizeWindow(parent, hwnd(), size);
597 void HWNDMessageHandler::SetRegion(HRGN region) {
598 custom_window_region_.Set(region);
599 ResetWindowRegion(false, true);
600 UpdateDwmNcRenderingPolicy();
603 void HWNDMessageHandler::StackAbove(HWND other_hwnd) {
604 SetWindowPos(hwnd(), other_hwnd, 0, 0, 0, 0,
605 SWP_NOSIZE | SWP_NOMOVE | SWP_NOACTIVATE);
608 void HWNDMessageHandler::StackAtTop() {
609 SetWindowPos(hwnd(), HWND_TOP, 0, 0, 0, 0,
610 SWP_NOSIZE | SWP_NOMOVE | SWP_NOACTIVATE);
613 void HWNDMessageHandler::Show() {
614 if (IsWindow(hwnd())) {
615 if (!(GetWindowLong(hwnd(), GWL_EXSTYLE) & WS_EX_TRANSPARENT) &&
616 !(GetWindowLong(hwnd(), GWL_EXSTYLE) & WS_EX_NOACTIVATE)) {
617 ShowWindowWithState(ui::SHOW_STATE_NORMAL);
619 ShowWindowWithState(ui::SHOW_STATE_INACTIVE);
624 void HWNDMessageHandler::ShowWindowWithState(ui::WindowShowState show_state) {
625 TRACE_EVENT0("views", "HWNDMessageHandler::ShowWindowWithState");
626 DWORD native_show_state;
627 switch (show_state) {
628 case ui::SHOW_STATE_INACTIVE:
629 native_show_state = SW_SHOWNOACTIVATE;
631 case ui::SHOW_STATE_MAXIMIZED:
632 native_show_state = SW_SHOWMAXIMIZED;
634 case ui::SHOW_STATE_MINIMIZED:
635 native_show_state = SW_SHOWMINIMIZED;
638 native_show_state = delegate_->GetInitialShowState();
642 ShowWindow(hwnd(), native_show_state);
643 // When launched from certain programs like bash and Windows Live Messenger,
644 // show_state is set to SW_HIDE, so we need to correct that condition. We
645 // don't just change show_state to SW_SHOWNORMAL because MSDN says we must
646 // always first call ShowWindow with the specified value from STARTUPINFO,
647 // otherwise all future ShowWindow calls will be ignored (!!#@@#!). Instead,
648 // we call ShowWindow again in this case.
649 if (native_show_state == SW_HIDE) {
650 native_show_state = SW_SHOWNORMAL;
651 ShowWindow(hwnd(), native_show_state);
654 // We need to explicitly activate the window if we've been shown with a state
655 // that should activate, because if we're opened from a desktop shortcut while
656 // an existing window is already running it doesn't seem to be enough to use
657 // one of these flags to activate the window.
658 if (native_show_state == SW_SHOWNORMAL ||
659 native_show_state == SW_SHOWMAXIMIZED)
662 if (!delegate_->HandleInitialFocus(show_state))
666 void HWNDMessageHandler::ShowMaximizedWithBounds(const gfx::Rect& bounds) {
667 WINDOWPLACEMENT placement = { 0 };
668 placement.length = sizeof(WINDOWPLACEMENT);
669 placement.showCmd = SW_SHOWMAXIMIZED;
670 placement.rcNormalPosition = bounds.ToRECT();
671 SetWindowPlacement(hwnd(), &placement);
674 void HWNDMessageHandler::Hide() {
675 if (IsWindow(hwnd())) {
676 // NOTE: Be careful not to activate any windows here (for example, calling
677 // ShowWindow(SW_HIDE) will automatically activate another window). This
678 // code can be called while a window is being deactivated, and activating
679 // another window will screw up the activation that is already in progress.
680 SetWindowPos(hwnd(), NULL, 0, 0, 0, 0,
681 SWP_HIDEWINDOW | SWP_NOACTIVATE | SWP_NOMOVE |
682 SWP_NOREPOSITION | SWP_NOSIZE | SWP_NOZORDER);
684 if (!GetParent(hwnd()))
685 NotifyOwnedWindowsParentClosing();
689 void HWNDMessageHandler::Maximize() {
690 ExecuteSystemMenuCommand(SC_MAXIMIZE);
693 void HWNDMessageHandler::Minimize() {
694 ExecuteSystemMenuCommand(SC_MINIMIZE);
695 delegate_->HandleNativeBlur(NULL);
698 void HWNDMessageHandler::Restore() {
699 ExecuteSystemMenuCommand(SC_RESTORE);
702 void HWNDMessageHandler::Activate() {
704 ::ShowWindow(hwnd(), SW_RESTORE);
705 ::SetWindowPos(hwnd(), HWND_TOP, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE);
706 SetForegroundWindow(hwnd());
709 void HWNDMessageHandler::Deactivate() {
710 HWND next_hwnd = ::GetNextWindow(hwnd(), GW_HWNDNEXT);
712 if (::IsWindowVisible(next_hwnd)) {
713 ::SetForegroundWindow(next_hwnd);
716 next_hwnd = ::GetNextWindow(next_hwnd, GW_HWNDNEXT);
720 void HWNDMessageHandler::SetAlwaysOnTop(bool on_top) {
721 ::SetWindowPos(hwnd(), on_top ? HWND_TOPMOST : HWND_NOTOPMOST,
722 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE);
725 bool HWNDMessageHandler::IsVisible() const {
726 return !!::IsWindowVisible(hwnd());
729 bool HWNDMessageHandler::IsActive() const {
730 return GetActiveWindow() == hwnd();
733 bool HWNDMessageHandler::IsMinimized() const {
734 return !!::IsIconic(hwnd());
737 bool HWNDMessageHandler::IsMaximized() const {
738 return !!::IsZoomed(hwnd());
741 bool HWNDMessageHandler::IsAlwaysOnTop() const {
742 return (GetWindowLong(hwnd(), GWL_EXSTYLE) & WS_EX_TOPMOST) != 0;
745 bool HWNDMessageHandler::RunMoveLoop(const gfx::Vector2d& drag_offset,
746 bool hide_on_escape) {
748 MoveLoopMouseWatcher watcher(this, hide_on_escape);
749 #if defined(USE_AURA)
750 // In Aura, we handle touch events asynchronously. So we need to allow nested
751 // tasks while in windows move loop.
752 base::MessageLoop::ScopedNestableTaskAllower allow_nested(
753 base::MessageLoop::current());
755 SendMessage(hwnd(), WM_SYSCOMMAND, SC_MOVE | 0x0002, GetMessagePos());
756 // Windows doesn't appear to offer a way to determine whether the user
757 // canceled the move or not. We assume if the user released the mouse it was
759 return watcher.got_mouse_up();
762 void HWNDMessageHandler::EndMoveLoop() {
763 SendMessage(hwnd(), WM_CANCELMODE, 0, 0);
766 void HWNDMessageHandler::SendFrameChanged() {
767 SetWindowPos(hwnd(), NULL, 0, 0, 0, 0,
768 SWP_FRAMECHANGED | SWP_NOACTIVATE | SWP_NOCOPYBITS |
769 SWP_NOMOVE | SWP_NOOWNERZORDER | SWP_NOREPOSITION |
770 SWP_NOSENDCHANGING | SWP_NOSIZE | SWP_NOZORDER);
773 void HWNDMessageHandler::FlashFrame(bool flash) {
775 fwi.cbSize = sizeof(fwi);
778 fwi.dwFlags = FLASHW_ALL;
782 fwi.dwFlags = FLASHW_STOP;
787 void HWNDMessageHandler::ClearNativeFocus() {
791 void HWNDMessageHandler::SetCapture() {
792 DCHECK(!HasCapture());
793 ::SetCapture(hwnd());
796 void HWNDMessageHandler::ReleaseCapture() {
801 bool HWNDMessageHandler::HasCapture() const {
802 return ::GetCapture() == hwnd();
805 void HWNDMessageHandler::SetVisibilityChangedAnimationsEnabled(bool enabled) {
806 if (base::win::GetVersion() >= base::win::VERSION_VISTA) {
807 int dwm_value = enabled ? FALSE : TRUE;
808 DwmSetWindowAttribute(
809 hwnd(), DWMWA_TRANSITIONS_FORCEDISABLED, &dwm_value, sizeof(dwm_value));
813 bool HWNDMessageHandler::SetTitle(const base::string16& title) {
814 base::string16 current_title;
815 size_t len_with_null = GetWindowTextLength(hwnd()) + 1;
816 if (len_with_null == 1 && title.length() == 0)
818 if (len_with_null - 1 == title.length() &&
820 hwnd(), WriteInto(¤t_title, len_with_null), len_with_null) &&
821 current_title == title)
823 SetWindowText(hwnd(), title.c_str());
827 void HWNDMessageHandler::SetCursor(HCURSOR cursor) {
829 previous_cursor_ = ::SetCursor(cursor);
830 current_cursor_ = cursor;
831 } else if (previous_cursor_) {
832 ::SetCursor(previous_cursor_);
833 previous_cursor_ = NULL;
837 void HWNDMessageHandler::FrameTypeChanged() {
838 // Called when the frame type could possibly be changing (theme change or
839 // DWM composition change).
840 UpdateDwmNcRenderingPolicy();
842 // Don't redraw the window here, because we need to hide and show the window
843 // which will also trigger a redraw.
844 ResetWindowRegion(true, false);
846 // The non-client view needs to update too.
847 delegate_->HandleFrameChanged();
849 if (IsVisible() && !delegate_->IsUsingCustomFrame()) {
850 // For some reason, we need to hide the window after we change from a custom
851 // frame to a native frame. If we don't, the client area will be filled
852 // with black. This seems to be related to an interaction between DWM and
853 // SetWindowRgn, but the details aren't clear. Additionally, we need to
854 // specify SWP_NOZORDER here, otherwise if you have multiple chrome windows
855 // open they will re-appear with a non-deterministic Z-order.
856 UINT flags = SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER;
857 SetWindowPos(hwnd(), NULL, 0, 0, 0, 0, flags | SWP_HIDEWINDOW);
858 SetWindowPos(hwnd(), NULL, 0, 0, 0, 0, flags | SWP_SHOWWINDOW);
859 // Invalidate the window to force a paint. There may be child windows which
860 // could resize in this context. Don't paint right away.
861 ::InvalidateRect(hwnd(), NULL, FALSE);
864 // WM_DWMCOMPOSITIONCHANGED is only sent to top level windows, however we want
865 // to notify our children too, since we can have MDI child windows who need to
866 // update their appearance.
867 EnumChildWindows(hwnd(), &SendDwmCompositionChanged, NULL);
870 void HWNDMessageHandler::SchedulePaintInRect(const gfx::Rect& rect) {
871 if (use_layered_buffer_) {
872 // We must update the back-buffer immediately, since Windows' handling of
873 // invalid rects is somewhat mysterious.
874 invalid_rect_.Union(rect);
876 // In some situations, such as drag and drop, when Windows itself runs a
877 // nested message loop our message loop appears to be starved and we don't
878 // receive calls to DidProcessMessage(). This only seems to affect layered
879 // windows, so we schedule a redraw manually using a task, since those never
880 // seem to be starved. Also, wtf.
881 if (!waiting_for_redraw_layered_window_contents_) {
882 waiting_for_redraw_layered_window_contents_ = true;
883 base::MessageLoop::current()->PostTask(
885 base::Bind(&HWNDMessageHandler::RedrawLayeredWindowContents,
886 weak_factory_.GetWeakPtr()));
889 // InvalidateRect() expects client coordinates.
890 RECT r = rect.ToRECT();
891 InvalidateRect(hwnd(), &r, FALSE);
895 void HWNDMessageHandler::SetOpacity(BYTE opacity) {
896 layered_alpha_ = opacity;
899 void HWNDMessageHandler::SetWindowIcons(const gfx::ImageSkia& window_icon,
900 const gfx::ImageSkia& app_icon) {
901 if (!window_icon.isNull()) {
902 HICON windows_icon = IconUtil::CreateHICONFromSkBitmap(
903 *window_icon.bitmap());
904 // We need to make sure to destroy the previous icon, otherwise we'll leak
905 // these GDI objects until we crash!
906 HICON old_icon = reinterpret_cast<HICON>(
907 SendMessage(hwnd(), WM_SETICON, ICON_SMALL,
908 reinterpret_cast<LPARAM>(windows_icon)));
910 DestroyIcon(old_icon);
912 if (!app_icon.isNull()) {
913 HICON windows_icon = IconUtil::CreateHICONFromSkBitmap(*app_icon.bitmap());
914 HICON old_icon = reinterpret_cast<HICON>(
915 SendMessage(hwnd(), WM_SETICON, ICON_BIG,
916 reinterpret_cast<LPARAM>(windows_icon)));
918 DestroyIcon(old_icon);
922 ////////////////////////////////////////////////////////////////////////////////
923 // HWNDMessageHandler, InputMethodDelegate implementation:
925 void HWNDMessageHandler::DispatchKeyEventPostIME(const ui::KeyEvent& key) {
926 SetMsgHandled(delegate_->HandleKeyEvent(key));
929 ////////////////////////////////////////////////////////////////////////////////
930 // HWNDMessageHandler, gfx::WindowImpl overrides:
932 HICON HWNDMessageHandler::GetDefaultWindowIcon() const {
933 if (use_system_default_icon_)
935 return ViewsDelegate::views_delegate ?
936 ViewsDelegate::views_delegate->GetDefaultWindowIcon() : NULL;
939 LRESULT HWNDMessageHandler::OnWndProc(UINT message,
942 HWND window = hwnd();
945 if (delegate_ && delegate_->PreHandleMSG(message, w_param, l_param, &result))
948 // Otherwise we handle everything else.
949 // NOTE: We inline ProcessWindowMessage() as 'this' may be destroyed during
950 // dispatch and ProcessWindowMessage() doesn't deal with that well.
951 const BOOL old_msg_handled = msg_handled_;
952 base::WeakPtr<HWNDMessageHandler> ref(weak_factory_.GetWeakPtr());
953 const BOOL processed =
954 _ProcessWindowMessage(window, message, w_param, l_param, result, 0);
957 msg_handled_ = old_msg_handled;
960 result = DefWindowProc(window, message, w_param, l_param);
962 // DefWindowProc() may have destroyed the window in a nested message loop.
963 if (!::IsWindow(window))
967 delegate_->PostHandleMSG(message, w_param, l_param);
968 if (message == WM_NCDESTROY) {
970 delegate_->HandleDestroyed();
973 // Only top level widget should store/restore focus.
974 if (message == WM_ACTIVATE && delegate_->CanSaveFocus())
975 PostProcessActivateMessage(LOWORD(w_param), !!HIWORD(w_param));
977 if (message == WM_ENABLE && restore_focus_when_enabled_) {
978 // This path should be executed only for top level as
979 // restore_focus_when_enabled_ is set in PostProcessActivateMessage.
980 DCHECK(delegate_->CanSaveFocus());
981 restore_focus_when_enabled_ = false;
982 delegate_->RestoreFocusOnEnable();
987 ////////////////////////////////////////////////////////////////////////////////
988 // HWNDMessageHandler, private:
990 int HWNDMessageHandler::GetAppbarAutohideEdges(HMONITOR monitor) {
991 autohide_factory_.InvalidateWeakPtrs();
992 return Appbar::instance()->GetAutohideEdges(
994 base::Bind(&HWNDMessageHandler::OnAppbarAutohideEdgesChanged,
995 autohide_factory_.GetWeakPtr()));
998 void HWNDMessageHandler::OnAppbarAutohideEdgesChanged() {
999 // This triggers querying WM_NCCALCSIZE again.
1001 GetWindowRect(hwnd(), &client);
1002 SetWindowPos(hwnd(), NULL, client.left, client.top,
1003 client.right - client.left, client.bottom - client.top,
1007 void HWNDMessageHandler::SetInitialFocus() {
1008 if (!(GetWindowLong(hwnd(), GWL_EXSTYLE) & WS_EX_TRANSPARENT) &&
1009 !(GetWindowLong(hwnd(), GWL_EXSTYLE) & WS_EX_NOACTIVATE)) {
1010 // The window does not get keyboard messages unless we focus it.
1015 void HWNDMessageHandler::PostProcessActivateMessage(int activation_state,
1017 DCHECK(delegate_->CanSaveFocus());
1019 bool active = activation_state != WA_INACTIVE && !minimized;
1020 if (delegate_->CanActivate())
1021 delegate_->HandleActivationChanged(active);
1024 // We might get activated/inactivated without being enabled, so we need to
1025 // clear restore_focus_when_enabled_.
1026 restore_focus_when_enabled_ = false;
1027 delegate_->SaveFocusOnDeactivate();
1029 // We must restore the focus after the message has been DefProc'ed as it
1030 // does set the focus to the last focused HWND.
1031 // Note that if the window is not enabled, we cannot restore the focus as
1032 // calling ::SetFocus on a child of the non-enabled top-window would fail.
1033 // This is the case when showing a modal dialog (such as 'open file',
1034 // 'print'...) from a different thread.
1035 // In that case we delay the focus restoration to when the window is enabled
1037 if (!IsWindowEnabled(hwnd())) {
1038 DCHECK(!restore_focus_when_enabled_);
1039 restore_focus_when_enabled_ = true;
1042 delegate_->RestoreFocusOnActivate();
1046 void HWNDMessageHandler::RestoreEnabledIfNecessary() {
1047 if (delegate_->IsModal() && !restored_enabled_) {
1048 restored_enabled_ = true;
1049 // If we were run modally, we need to undo the disabled-ness we inflicted on
1050 // the owner's parent hierarchy.
1051 HWND start = ::GetWindow(hwnd(), GW_OWNER);
1053 ::EnableWindow(start, TRUE);
1054 start = ::GetParent(start);
1059 void HWNDMessageHandler::ExecuteSystemMenuCommand(int command) {
1061 SendMessage(hwnd(), WM_SYSCOMMAND, command, 0);
1064 void HWNDMessageHandler::TrackMouseEvents(DWORD mouse_tracking_flags) {
1065 // Begin tracking mouse events for this HWND so that we get WM_MOUSELEAVE
1066 // when the user moves the mouse outside this HWND's bounds.
1067 if (active_mouse_tracking_flags_ == 0 || mouse_tracking_flags & TME_CANCEL) {
1068 if (mouse_tracking_flags & TME_CANCEL) {
1069 // We're about to cancel active mouse tracking, so empty out the stored
1071 active_mouse_tracking_flags_ = 0;
1073 active_mouse_tracking_flags_ = mouse_tracking_flags;
1076 TRACKMOUSEEVENT tme;
1077 tme.cbSize = sizeof(tme);
1078 tme.dwFlags = mouse_tracking_flags;
1079 tme.hwndTrack = hwnd();
1080 tme.dwHoverTime = 0;
1081 TrackMouseEvent(&tme);
1082 } else if (mouse_tracking_flags != active_mouse_tracking_flags_) {
1083 TrackMouseEvents(active_mouse_tracking_flags_ | TME_CANCEL);
1084 TrackMouseEvents(mouse_tracking_flags);
1088 void HWNDMessageHandler::ClientAreaSizeChanged() {
1089 gfx::Size s = GetClientAreaBounds().size();
1090 delegate_->HandleClientSizeChanged(s);
1091 if (use_layered_buffer_)
1092 layered_window_contents_.reset(new gfx::Canvas(s, 1.0f, false));
1095 bool HWNDMessageHandler::GetClientAreaInsets(gfx::Insets* insets) const {
1096 if (delegate_->GetClientAreaInsets(insets))
1098 DCHECK(insets->empty());
1100 // Returning false causes the default handling in OnNCCalcSize() to
1102 if (!delegate_->IsWidgetWindow() ||
1103 (!delegate_->IsUsingCustomFrame() && !remove_standard_frame_)) {
1107 if (IsMaximized()) {
1108 // Windows automatically adds a standard width border to all sides when a
1109 // window is maximized.
1110 int border_thickness = GetSystemMetrics(SM_CXSIZEFRAME);
1111 if (remove_standard_frame_)
1112 border_thickness -= 1;
1113 *insets = gfx::Insets(
1114 border_thickness, border_thickness, border_thickness, border_thickness);
1118 *insets = gfx::Insets();
1122 void HWNDMessageHandler::ResetWindowRegion(bool force, bool redraw) {
1123 // A native frame uses the native window region, and we don't want to mess
1125 // WS_EX_COMPOSITED is used instead of WS_EX_LAYERED under aura. WS_EX_LAYERED
1126 // automatically makes clicks on transparent pixels fall through, that isn't
1127 // the case with WS_EX_COMPOSITED. So, we route WS_EX_COMPOSITED through to
1128 // the delegate to allow for a custom hit mask.
1129 if ((window_ex_style() & WS_EX_COMPOSITED) == 0 && !custom_window_region_ &&
1130 (!delegate_->IsUsingCustomFrame() || !delegate_->IsWidgetWindow())) {
1132 SetWindowRgn(hwnd(), NULL, redraw);
1136 // Changing the window region is going to force a paint. Only change the
1137 // window region if the region really differs.
1138 HRGN current_rgn = CreateRectRgn(0, 0, 0, 0);
1139 int current_rgn_result = GetWindowRgn(hwnd(), current_rgn);
1142 GetWindowRect(hwnd(), &window_rect);
1144 if (custom_window_region_) {
1145 new_region = ::CreateRectRgn(0, 0, 0, 0);
1146 ::CombineRgn(new_region, custom_window_region_.Get(), NULL, RGN_COPY);
1147 } else if (IsMaximized()) {
1148 HMONITOR monitor = MonitorFromWindow(hwnd(), MONITOR_DEFAULTTONEAREST);
1150 mi.cbSize = sizeof mi;
1151 GetMonitorInfo(monitor, &mi);
1152 RECT work_rect = mi.rcWork;
1153 OffsetRect(&work_rect, -window_rect.left, -window_rect.top);
1154 new_region = CreateRectRgnIndirect(&work_rect);
1156 gfx::Path window_mask;
1157 delegate_->GetWindowMask(gfx::Size(window_rect.right - window_rect.left,
1158 window_rect.bottom - window_rect.top),
1160 new_region = gfx::CreateHRGNFromSkPath(window_mask);
1163 if (current_rgn_result == ERROR || !EqualRgn(current_rgn, new_region)) {
1164 // SetWindowRgn takes ownership of the HRGN created by CreateNativeRegion.
1165 SetWindowRgn(hwnd(), new_region, redraw);
1167 DeleteObject(new_region);
1170 DeleteObject(current_rgn);
1173 void HWNDMessageHandler::UpdateDwmNcRenderingPolicy() {
1174 if (base::win::GetVersion() < base::win::VERSION_VISTA)
1177 DWMNCRENDERINGPOLICY policy =
1178 custom_window_region_ || delegate_->IsUsingCustomFrame() ?
1179 DWMNCRP_DISABLED : DWMNCRP_ENABLED;
1181 DwmSetWindowAttribute(hwnd(), DWMWA_NCRENDERING_POLICY,
1182 &policy, sizeof(DWMNCRENDERINGPOLICY));
1185 LRESULT HWNDMessageHandler::DefWindowProcWithRedrawLock(UINT message,
1188 ScopedRedrawLock lock(this);
1189 // The Widget and HWND can be destroyed in the call to DefWindowProc, so use
1190 // the WeakPtrFactory to avoid unlocking (and crashing) after destruction.
1191 base::WeakPtr<HWNDMessageHandler> ref(weak_factory_.GetWeakPtr());
1192 LRESULT result = DefWindowProc(hwnd(), message, w_param, l_param);
1194 lock.CancelUnlockOperation();
1198 void HWNDMessageHandler::NotifyOwnedWindowsParentClosing() {
1199 FindOwnedWindowsData data;
1200 data.window = hwnd();
1201 EnumThreadWindows(GetCurrentThreadId(), FindOwnedWindowsCallback,
1202 reinterpret_cast<LPARAM>(&data));
1203 for (size_t i = 0; i < data.owned_widgets.size(); ++i)
1204 data.owned_widgets[i]->OnOwnerClosing();
1207 void HWNDMessageHandler::LockUpdates(bool force) {
1208 // We skip locked updates when Aero is on for two reasons:
1209 // 1. Because it isn't necessary
1210 // 2. Because toggling the WS_VISIBLE flag may occur while the GPU process is
1211 // attempting to present a child window's backbuffer onscreen. When these
1212 // two actions race with one another, the child window will either flicker
1213 // or will simply stop updating entirely.
1214 if ((force || !ui::win::IsAeroGlassEnabled()) && ++lock_updates_count_ == 1) {
1215 SetWindowLong(hwnd(), GWL_STYLE,
1216 GetWindowLong(hwnd(), GWL_STYLE) & ~WS_VISIBLE);
1220 void HWNDMessageHandler::UnlockUpdates(bool force) {
1221 if ((force || !ui::win::IsAeroGlassEnabled()) && --lock_updates_count_ <= 0) {
1222 SetWindowLong(hwnd(), GWL_STYLE,
1223 GetWindowLong(hwnd(), GWL_STYLE) | WS_VISIBLE);
1224 lock_updates_count_ = 0;
1228 void HWNDMessageHandler::RedrawLayeredWindowContents() {
1229 waiting_for_redraw_layered_window_contents_ = false;
1230 if (invalid_rect_.IsEmpty())
1233 // We need to clip to the dirty rect ourselves.
1234 layered_window_contents_->sk_canvas()->save(SkCanvas::kClip_SaveFlag);
1235 double scale = gfx::win::GetDeviceScaleFactor();
1236 layered_window_contents_->sk_canvas()->scale(
1237 SkScalar(scale),SkScalar(scale));
1238 layered_window_contents_->ClipRect(invalid_rect_);
1239 delegate_->PaintLayeredWindow(layered_window_contents_.get());
1240 layered_window_contents_->sk_canvas()->scale(
1241 SkScalar(1.0/scale),SkScalar(1.0/scale));
1242 layered_window_contents_->sk_canvas()->restore();
1245 GetWindowRect(hwnd(), &wr);
1246 SIZE size = {wr.right - wr.left, wr.bottom - wr.top};
1247 POINT position = {wr.left, wr.top};
1248 HDC dib_dc = skia::BeginPlatformPaint(layered_window_contents_->sk_canvas());
1249 POINT zero = {0, 0};
1250 BLENDFUNCTION blend = {AC_SRC_OVER, 0, layered_alpha_, AC_SRC_ALPHA};
1251 UpdateLayeredWindow(hwnd(), NULL, &position, &size, dib_dc, &zero,
1252 RGB(0xFF, 0xFF, 0xFF), &blend, ULW_ALPHA);
1253 invalid_rect_.SetRect(0, 0, 0, 0);
1254 skia::EndPlatformPaint(layered_window_contents_->sk_canvas());
1257 void HWNDMessageHandler::ForceRedrawWindow(int attempts) {
1258 if (ui::IsWorkstationLocked()) {
1259 // Presents will continue to fail as long as the input desktop is
1261 if (--attempts <= 0)
1263 base::MessageLoop::current()->PostDelayedTask(
1265 base::Bind(&HWNDMessageHandler::ForceRedrawWindow,
1266 weak_factory_.GetWeakPtr(),
1268 base::TimeDelta::FromMilliseconds(500));
1271 InvalidateRect(hwnd(), NULL, FALSE);
1274 // Message handlers ------------------------------------------------------------
1276 void HWNDMessageHandler::OnActivateApp(BOOL active, DWORD thread_id) {
1277 if (delegate_->IsWidgetWindow() && !active &&
1278 thread_id != GetCurrentThreadId()) {
1279 delegate_->HandleAppDeactivated();
1280 // Also update the native frame if it is rendering the non-client area.
1281 if (!remove_standard_frame_ && !delegate_->IsUsingCustomFrame())
1282 DefWindowProcWithRedrawLock(WM_NCACTIVATE, FALSE, 0);
1286 BOOL HWNDMessageHandler::OnAppCommand(HWND window,
1290 BOOL handled = !!delegate_->HandleAppCommand(command);
1291 SetMsgHandled(handled);
1292 // Make sure to return TRUE if the event was handled or in some cases the
1293 // system will execute the default handler which can cause bugs like going
1294 // forward or back two pages instead of one.
1298 void HWNDMessageHandler::OnCancelMode() {
1299 delegate_->HandleCancelMode();
1300 // Need default handling, otherwise capture and other things aren't canceled.
1301 SetMsgHandled(FALSE);
1304 void HWNDMessageHandler::OnCaptureChanged(HWND window) {
1305 delegate_->HandleCaptureLost();
1308 void HWNDMessageHandler::OnClose() {
1309 delegate_->HandleClose();
1312 void HWNDMessageHandler::OnCommand(UINT notification_code,
1315 // If the notification code is > 1 it means it is control specific and we
1316 // should ignore it.
1317 if (notification_code > 1 || delegate_->HandleAppCommand(command))
1318 SetMsgHandled(FALSE);
1321 LRESULT HWNDMessageHandler::OnCreate(CREATESTRUCT* create_struct) {
1322 use_layered_buffer_ = !!(window_ex_style() & WS_EX_LAYERED);
1324 #if defined(USE_AURA)
1325 if (window_ex_style() & WS_EX_COMPOSITED) {
1326 if (base::win::GetVersion() >= base::win::VERSION_VISTA) {
1327 // This is part of the magic to emulate layered windows with Aura
1328 // see the explanation elsewere when we set WS_EX_COMPOSITED style.
1329 MARGINS margins = {-1,-1,-1,-1};
1330 DwmExtendFrameIntoClientArea(hwnd(), &margins);
1335 fullscreen_handler_->set_hwnd(hwnd());
1337 // This message initializes the window so that focus border are shown for
1341 MAKELPARAM(UIS_CLEAR, UISF_HIDEFOCUS),
1344 if (remove_standard_frame_) {
1345 SetWindowLong(hwnd(), GWL_STYLE,
1346 GetWindowLong(hwnd(), GWL_STYLE) & ~WS_CAPTION);
1350 // Get access to a modifiable copy of the system menu.
1351 GetSystemMenu(hwnd(), false);
1353 if (base::win::GetVersion() >= base::win::VERSION_WIN7 &&
1354 ui::AreTouchEventsEnabled())
1355 RegisterTouchWindow(hwnd(), TWF_WANTPALM);
1357 // We need to allow the delegate to size its contents since the window may not
1358 // receive a size notification when its initial bounds are specified at window
1360 ClientAreaSizeChanged();
1362 delegate_->HandleCreate();
1364 WTSRegisterSessionNotification(hwnd(), NOTIFY_FOR_THIS_SESSION);
1366 // TODO(beng): move more of NWW::OnCreate here.
1370 void HWNDMessageHandler::OnDestroy() {
1371 WTSUnRegisterSessionNotification(hwnd());
1372 delegate_->HandleDestroying();
1375 void HWNDMessageHandler::OnDisplayChange(UINT bits_per_pixel,
1376 const gfx::Size& screen_size) {
1377 delegate_->HandleDisplayChange();
1380 LRESULT HWNDMessageHandler::OnDwmCompositionChanged(UINT msg,
1383 if (!delegate_->IsWidgetWindow()) {
1384 SetMsgHandled(FALSE);
1392 void HWNDMessageHandler::OnEnterMenuLoop(BOOL from_track_popup_menu) {
1393 if (menu_depth_++ == 0)
1394 delegate_->HandleMenuLoop(true);
1397 void HWNDMessageHandler::OnEnterSizeMove() {
1398 // Please refer to the comments in the OnSize function about the scrollbar
1400 // Hide the Windows scrollbar if the scroll styles are present to ensure
1401 // that a paint flicker does not occur while sizing.
1402 if (in_size_loop_ && needs_scroll_styles_)
1403 ShowScrollBar(hwnd(), SB_BOTH, FALSE);
1405 delegate_->HandleBeginWMSizeMove();
1406 SetMsgHandled(FALSE);
1409 LRESULT HWNDMessageHandler::OnEraseBkgnd(HDC dc) {
1410 // Needed to prevent resize flicker.
1414 void HWNDMessageHandler::OnExitMenuLoop(BOOL is_shortcut_menu) {
1415 if (--menu_depth_ == 0)
1416 delegate_->HandleMenuLoop(false);
1417 DCHECK_GE(0, menu_depth_);
1420 void HWNDMessageHandler::OnExitSizeMove() {
1421 delegate_->HandleEndWMSizeMove();
1422 SetMsgHandled(FALSE);
1423 // Please refer to the notes in the OnSize function for information about
1424 // the scrolling hack.
1425 // We hide the Windows scrollbar in the OnEnterSizeMove function. We need
1426 // to add the scroll styles back to ensure that scrolling works in legacy
1427 // trackpoint drivers.
1428 if (in_size_loop_ && needs_scroll_styles_)
1429 AddScrollStylesToWindow(hwnd());
1432 void HWNDMessageHandler::OnGetMinMaxInfo(MINMAXINFO* minmax_info) {
1433 gfx::Size min_window_size;
1434 gfx::Size max_window_size;
1435 delegate_->GetMinMaxSize(&min_window_size, &max_window_size);
1437 // Add the native frame border size to the minimum and maximum size if the
1438 // view reports its size as the client size.
1439 if (delegate_->WidgetSizeIsClientSize()) {
1440 RECT client_rect, window_rect;
1441 GetClientRect(hwnd(), &client_rect);
1442 GetWindowRect(hwnd(), &window_rect);
1443 CR_DEFLATE_RECT(&window_rect, &client_rect);
1444 min_window_size.Enlarge(window_rect.right - window_rect.left,
1445 window_rect.bottom - window_rect.top);
1446 if (!max_window_size.IsEmpty()) {
1447 max_window_size.Enlarge(window_rect.right - window_rect.left,
1448 window_rect.bottom - window_rect.top);
1451 minmax_info->ptMinTrackSize.x = min_window_size.width();
1452 minmax_info->ptMinTrackSize.y = min_window_size.height();
1453 if (max_window_size.width() || max_window_size.height()) {
1454 if (!max_window_size.width())
1455 max_window_size.set_width(GetSystemMetrics(SM_CXMAXTRACK));
1456 if (!max_window_size.height())
1457 max_window_size.set_height(GetSystemMetrics(SM_CYMAXTRACK));
1458 minmax_info->ptMaxTrackSize.x = max_window_size.width();
1459 minmax_info->ptMaxTrackSize.y = max_window_size.height();
1461 SetMsgHandled(FALSE);
1464 LRESULT HWNDMessageHandler::OnGetObject(UINT message,
1467 LRESULT reference_result = static_cast<LRESULT>(0L);
1469 // Accessibility readers will send an OBJID_CLIENT message
1470 if (OBJID_CLIENT == l_param) {
1471 // Retrieve MSAA dispatch object for the root view.
1472 base::win::ScopedComPtr<IAccessible> root(
1473 delegate_->GetNativeViewAccessible());
1475 // Create a reference that MSAA will marshall to the client.
1476 reference_result = LresultFromObject(IID_IAccessible, w_param,
1477 static_cast<IAccessible*>(root.Detach()));
1480 return reference_result;
1483 LRESULT HWNDMessageHandler::OnImeMessages(UINT message,
1487 SetMsgHandled(delegate_->HandleIMEMessage(
1488 message, w_param, l_param, &result));
1492 void HWNDMessageHandler::OnInitMenu(HMENU menu) {
1493 bool is_fullscreen = fullscreen_handler_->fullscreen();
1494 bool is_minimized = IsMinimized();
1495 bool is_maximized = IsMaximized();
1496 bool is_restored = !is_fullscreen && !is_minimized && !is_maximized;
1498 ScopedRedrawLock lock(this);
1499 EnableMenuItemByCommand(menu, SC_RESTORE, delegate_->CanResize() &&
1500 (is_minimized || is_maximized));
1501 EnableMenuItemByCommand(menu, SC_MOVE, is_restored);
1502 EnableMenuItemByCommand(menu, SC_SIZE, delegate_->CanResize() && is_restored);
1503 EnableMenuItemByCommand(menu, SC_MAXIMIZE, delegate_->CanMaximize() &&
1504 !is_fullscreen && !is_maximized);
1505 // TODO: unfortunately, WidgetDelegate does not declare CanMinimize() and some
1506 // code depends on this check, see http://crbug.com/341010.
1507 EnableMenuItemByCommand(menu, SC_MINIMIZE, delegate_->CanMaximize() &&
1510 if (is_maximized && delegate_->CanResize())
1511 ::SetMenuDefaultItem(menu, SC_RESTORE, FALSE);
1512 else if (!is_maximized && delegate_->CanMaximize())
1513 ::SetMenuDefaultItem(menu, SC_MAXIMIZE, FALSE);
1516 void HWNDMessageHandler::OnInputLangChange(DWORD character_set,
1517 HKL input_language_id) {
1518 delegate_->HandleInputLanguageChange(character_set, input_language_id);
1521 LRESULT HWNDMessageHandler::OnKeyEvent(UINT message,
1524 MSG msg = { hwnd(), message, w_param, l_param, GetMessageTime() };
1525 ui::KeyEvent key(msg, message == WM_CHAR);
1526 if (!delegate_->HandleUntranslatedKeyEvent(key))
1527 DispatchKeyEventPostIME(key);
1531 void HWNDMessageHandler::OnKillFocus(HWND focused_window) {
1532 delegate_->HandleNativeBlur(focused_window);
1533 SetMsgHandled(FALSE);
1536 LRESULT HWNDMessageHandler::OnMouseActivate(UINT message,
1539 #if defined(USE_AURA)
1540 // On Windows, if we select the menu item by touch and if the window at the
1541 // location is another window on the same thread, that window gets a
1542 // WM_MOUSEACTIVATE message and ends up activating itself, which is not
1543 // correct. We workaround this by setting a property on the window at the
1544 // current cursor location. We check for this property in our
1545 // WM_MOUSEACTIVATE handler and don't activate the window if the property is
1547 if (::GetProp(hwnd(), kIgnoreTouchMouseActivateForWindow)) {
1548 ::RemoveProp(hwnd(), kIgnoreTouchMouseActivateForWindow);
1549 return MA_NOACTIVATE;
1551 // A child window activation should be treated as if we lost activation.
1552 POINT cursor_pos = {0};
1553 ::GetCursorPos(&cursor_pos);
1554 ::ScreenToClient(hwnd(), &cursor_pos);
1555 HWND child = ::RealChildWindowFromPoint(hwnd(), cursor_pos);
1556 if (::IsWindow(child) && child != hwnd() && ::IsWindowVisible(child))
1557 PostProcessActivateMessage(WA_INACTIVE, false);
1559 // TODO(beng): resolve this with the GetWindowLong() check on the subsequent
1561 if (delegate_->IsWidgetWindow())
1562 return delegate_->CanActivate() ? MA_ACTIVATE : MA_NOACTIVATEANDEAT;
1563 if (GetWindowLong(hwnd(), GWL_EXSTYLE) & WS_EX_NOACTIVATE)
1564 return MA_NOACTIVATE;
1565 SetMsgHandled(FALSE);
1569 LRESULT HWNDMessageHandler::OnMouseRange(UINT message,
1572 #if defined(USE_AURA)
1573 if (!touch_ids_.empty())
1575 // We handle touch events on Windows Aura. Windows generates synthesized
1576 // mouse messages in response to touch which we should ignore. However touch
1577 // messages are only received for the client area. We need to ignore the
1578 // synthesized mouse messages for all points in the client area and places
1579 // which return HTNOWHERE.
1580 if (ui::IsMouseEventFromTouch(message)) {
1581 LPARAM l_param_ht = l_param;
1582 // For mouse events (except wheel events), location is in window coordinates
1583 // and should be converted to screen coordinates for WM_NCHITTEST.
1584 if (message != WM_MOUSEWHEEL && message != WM_MOUSEHWHEEL) {
1585 POINT screen_point = CR_POINT_INITIALIZER_FROM_LPARAM(l_param_ht);
1586 MapWindowPoints(hwnd(), HWND_DESKTOP, &screen_point, 1);
1587 l_param_ht = MAKELPARAM(screen_point.x, screen_point.y);
1589 LRESULT hittest = SendMessage(hwnd(), WM_NCHITTEST, 0, l_param_ht);
1590 if (hittest == HTCLIENT || hittest == HTNOWHERE)
1594 if (message == WM_RBUTTONUP && is_right_mouse_pressed_on_caption_) {
1595 is_right_mouse_pressed_on_caption_ = false;
1597 // |point| is in window coordinates, but WM_NCHITTEST and TrackPopupMenu()
1598 // expect screen coordinates.
1599 POINT screen_point = CR_POINT_INITIALIZER_FROM_LPARAM(l_param);
1600 MapWindowPoints(hwnd(), HWND_DESKTOP, &screen_point, 1);
1601 w_param = SendMessage(hwnd(), WM_NCHITTEST, 0,
1602 MAKELPARAM(screen_point.x, screen_point.y));
1603 if (w_param == HTCAPTION || w_param == HTSYSMENU) {
1604 gfx::ShowSystemMenuAtPoint(hwnd(), gfx::Point(screen_point));
1607 } else if (message == WM_NCLBUTTONDOWN && delegate_->IsUsingCustomFrame()) {
1612 // When the mouse is pressed down in these specific non-client areas,
1613 // we need to tell the RootView to send the mouse pressed event (which
1614 // sets capture, allowing subsequent WM_LBUTTONUP (note, _not_
1615 // WM_NCLBUTTONUP) to fire so that the appropriate WM_SYSCOMMAND can be
1616 // sent by the applicable button's ButtonListener. We _have_ to do this
1617 // way rather than letting Windows just send the syscommand itself (as
1618 // would happen if we never did this dance) because for some insane
1619 // reason DefWindowProc for WM_NCLBUTTONDOWN also renders the pressed
1620 // window control button appearance, in the Windows classic style, over
1621 // our view! Ick! By handling this message we prevent Windows from
1622 // doing this undesirable thing, but that means we need to roll the
1623 // sys-command handling ourselves.
1624 // Combine |w_param| with common key state message flags.
1625 w_param |= base::win::IsCtrlPressed() ? MK_CONTROL : 0;
1626 w_param |= base::win::IsShiftPressed() ? MK_SHIFT : 0;
1629 } else if (message == WM_NCRBUTTONDOWN &&
1630 (w_param == HTCAPTION || w_param == HTSYSMENU)) {
1631 is_right_mouse_pressed_on_caption_ = true;
1632 // We SetCapture() to ensure we only show the menu when the button
1633 // down and up are both on the caption. Note: this causes the button up to
1634 // be WM_RBUTTONUP instead of WM_NCRBUTTONUP.
1637 MSG msg = { hwnd(), message, w_param, l_param, GetMessageTime(),
1638 { CR_GET_X_LPARAM(l_param), CR_GET_Y_LPARAM(l_param) } };
1639 ui::MouseEvent event(msg);
1640 if (!touch_ids_.empty() || ui::IsMouseEventFromTouch(message))
1641 event.set_flags(event.flags() | ui::EF_FROM_TOUCH);
1643 if (!(event.flags() & ui::EF_IS_NON_CLIENT))
1644 delegate_->HandleTooltipMouseMove(message, w_param, l_param);
1646 // Certain child windows forward mouse events to us. We don't want to track
1647 // these mouse moves as the child window will also send us a WM_MOUSELEAVE.
1648 if (event.type() == ui::ET_MOUSE_MOVED && !HasCapture() &&
1649 HIWORD(w_param) != SPECIAL_MOUSEMOVE_NOT_TO_BE_TRACKED) {
1650 // Windows only fires WM_MOUSELEAVE events if the application begins
1651 // "tracking" mouse events for a given HWND during WM_MOUSEMOVE events.
1652 // We need to call |TrackMouseEvents| to listen for WM_MOUSELEAVE.
1653 TrackMouseEvents((message == WM_NCMOUSEMOVE) ?
1654 TME_NONCLIENT | TME_LEAVE : TME_LEAVE);
1655 } else if (event.type() == ui::ET_MOUSE_EXITED) {
1656 // Reset our tracking flags so future mouse movement over this
1657 // NativeWidgetWin results in a new tracking session. Fall through for
1659 active_mouse_tracking_flags_ = 0;
1660 } else if (event.type() == ui::ET_MOUSEWHEEL) {
1661 // Reroute the mouse wheel to the window under the pointer if applicable.
1662 return (ui::RerouteMouseWheel(hwnd(), w_param, l_param) ||
1663 delegate_->HandleMouseEvent(ui::MouseWheelEvent(msg))) ? 0 : 1;
1666 // There are cases where the code handling the message destroys the window,
1667 // so use the weak ptr to check if destruction occured or not.
1668 base::WeakPtr<HWNDMessageHandler> ref(weak_factory_.GetWeakPtr());
1669 bool handled = delegate_->HandleMouseEvent(event);
1672 if (!handled && message == WM_NCLBUTTONDOWN && w_param != HTSYSMENU &&
1673 delegate_->IsUsingCustomFrame()) {
1674 // TODO(msw): Eliminate undesired painting, or re-evaluate this workaround.
1675 // DefWindowProc for WM_NCLBUTTONDOWN does weird non-client painting, so we
1676 // need to call it inside a ScopedRedrawLock. This may cause other negative
1677 // side-effects (ex/ stifling non-client mouse releases).
1678 DefWindowProcWithRedrawLock(message, w_param, l_param);
1683 SetMsgHandled(handled);
1687 void HWNDMessageHandler::OnMove(const gfx::Point& point) {
1688 delegate_->HandleMove();
1689 SetMsgHandled(FALSE);
1692 void HWNDMessageHandler::OnMoving(UINT param, const RECT* new_bounds) {
1693 delegate_->HandleMove();
1696 LRESULT HWNDMessageHandler::OnNCActivate(UINT message,
1699 // Per MSDN, w_param is either TRUE or FALSE. However, MSDN also hints that:
1700 // "If the window is minimized when this message is received, the application
1701 // should pass the message to the DefWindowProc function."
1702 // It is found out that the high word of w_param might be set when the window
1703 // is minimized or restored. To handle this, w_param's high word should be
1704 // cleared before it is converted to BOOL.
1705 BOOL active = static_cast<BOOL>(LOWORD(w_param));
1707 bool inactive_rendering_disabled = delegate_->IsInactiveRenderingDisabled();
1709 if (!delegate_->IsWidgetWindow()) {
1710 SetMsgHandled(FALSE);
1714 if (!delegate_->CanActivate())
1717 // On activation, lift any prior restriction against rendering as inactive.
1718 if (active && inactive_rendering_disabled)
1719 delegate_->EnableInactiveRendering();
1721 if (delegate_->IsUsingCustomFrame()) {
1722 // TODO(beng, et al): Hack to redraw this window and child windows
1723 // synchronously upon activation. Not all child windows are redrawing
1724 // themselves leading to issues like http://crbug.com/74604
1725 // We redraw out-of-process HWNDs asynchronously to avoid hanging the
1726 // whole app if a child HWND belonging to a hung plugin is encountered.
1727 RedrawWindow(hwnd(), NULL, NULL,
1728 RDW_NOCHILDREN | RDW_INVALIDATE | RDW_UPDATENOW);
1729 EnumChildWindows(hwnd(), EnumChildWindowsForRedraw, NULL);
1732 // The frame may need to redraw as a result of the activation change.
1733 // We can get WM_NCACTIVATE before we're actually visible. If we're not
1734 // visible, no need to paint.
1736 delegate_->SchedulePaint();
1738 // Avoid DefWindowProc non-client rendering over our custom frame on newer
1739 // Windows versions only (breaks taskbar activation indication on XP/Vista).
1740 if (delegate_->IsUsingCustomFrame() &&
1741 base::win::GetVersion() > base::win::VERSION_VISTA) {
1742 SetMsgHandled(TRUE);
1746 return DefWindowProcWithRedrawLock(
1747 WM_NCACTIVATE, inactive_rendering_disabled || active, 0);
1750 LRESULT HWNDMessageHandler::OnNCCalcSize(BOOL mode, LPARAM l_param) {
1751 // We only override the default handling if we need to specify a custom
1752 // non-client edge width. Note that in most cases "no insets" means no
1753 // custom width, but in fullscreen mode or when the NonClientFrameView
1754 // requests it, we want a custom width of 0.
1756 // Let User32 handle the first nccalcsize for captioned windows
1757 // so it updates its internal structures (specifically caption-present)
1758 // Without this Tile & Cascade windows won't work.
1759 // See http://code.google.com/p/chromium/issues/detail?id=900
1760 if (is_first_nccalc_) {
1761 is_first_nccalc_ = false;
1762 if (GetWindowLong(hwnd(), GWL_STYLE) & WS_CAPTION) {
1763 SetMsgHandled(FALSE);
1769 bool got_insets = GetClientAreaInsets(&insets);
1770 if (!got_insets && !fullscreen_handler_->fullscreen() &&
1771 !(mode && remove_standard_frame_)) {
1772 SetMsgHandled(FALSE);
1776 RECT* client_rect = mode ?
1777 &(reinterpret_cast<NCCALCSIZE_PARAMS*>(l_param)->rgrc[0]) :
1778 reinterpret_cast<RECT*>(l_param);
1779 client_rect->left += insets.left();
1780 client_rect->top += insets.top();
1781 client_rect->bottom -= insets.bottom();
1782 client_rect->right -= insets.right();
1783 if (IsMaximized()) {
1784 // Find all auto-hide taskbars along the screen edges and adjust in by the
1785 // thickness of the auto-hide taskbar on each such edge, so the window isn't
1786 // treated as a "fullscreen app", which would cause the taskbars to
1788 HMONITOR monitor = MonitorFromWindow(hwnd(), MONITOR_DEFAULTTONULL);
1790 // We might end up here if the window was previously minimized and the
1791 // user clicks on the taskbar button to restore it in the previously
1792 // maximized position. In that case WM_NCCALCSIZE is sent before the
1793 // window coordinates are restored to their previous values, so our
1794 // (left,top) would probably be (-32000,-32000) like all minimized
1795 // windows. So the above MonitorFromWindow call fails, but if we check
1796 // the window rect given with WM_NCCALCSIZE (which is our previous
1797 // restored window position) we will get the correct monitor handle.
1798 monitor = MonitorFromRect(client_rect, MONITOR_DEFAULTTONULL);
1800 // This is probably an extreme case that we won't hit, but if we don't
1801 // intersect any monitor, let us not adjust the client rect since our
1802 // window will not be visible anyway.
1806 const int autohide_edges = GetAppbarAutohideEdges(monitor);
1807 if (autohide_edges & Appbar::EDGE_LEFT)
1808 client_rect->left += kAutoHideTaskbarThicknessPx;
1809 if (autohide_edges & Appbar::EDGE_TOP) {
1810 if (!delegate_->IsUsingCustomFrame()) {
1811 // Tricky bit. Due to a bug in DwmDefWindowProc()'s handling of
1812 // WM_NCHITTEST, having any nonclient area atop the window causes the
1813 // caption buttons to draw onscreen but not respond to mouse
1815 // So for a taskbar at the screen top, we can't push the
1816 // client_rect->top down; instead, we move the bottom up by one pixel,
1817 // which is the smallest change we can make and still get a client area
1818 // less than the screen size. This is visibly ugly, but there seems to
1819 // be no better solution.
1820 --client_rect->bottom;
1822 client_rect->top += kAutoHideTaskbarThicknessPx;
1825 if (autohide_edges & Appbar::EDGE_RIGHT)
1826 client_rect->right -= kAutoHideTaskbarThicknessPx;
1827 if (autohide_edges & Appbar::EDGE_BOTTOM)
1828 client_rect->bottom -= kAutoHideTaskbarThicknessPx;
1830 // We cannot return WVR_REDRAW when there is nonclient area, or Windows
1831 // exhibits bugs where client pixels and child HWNDs are mispositioned by
1832 // the width/height of the upper-left nonclient area.
1836 // If the window bounds change, we're going to relayout and repaint anyway.
1837 // Returning WVR_REDRAW avoids an extra paint before that of the old client
1838 // pixels in the (now wrong) location, and thus makes actions like resizing a
1839 // window from the left edge look slightly less broken.
1840 // We special case when left or top insets are 0, since these conditions
1841 // actually require another repaint to correct the layout after glass gets
1842 // turned on and off.
1843 if (insets.left() == 0 || insets.top() == 0)
1845 return mode ? WVR_REDRAW : 0;
1848 LRESULT HWNDMessageHandler::OnNCHitTest(const gfx::Point& point) {
1849 if (!delegate_->IsWidgetWindow()) {
1850 SetMsgHandled(FALSE);
1854 // If the DWM is rendering the window controls, we need to give the DWM's
1855 // default window procedure first chance to handle hit testing.
1856 if (!remove_standard_frame_ && !delegate_->IsUsingCustomFrame()) {
1858 if (DwmDefWindowProc(hwnd(), WM_NCHITTEST, 0,
1859 MAKELPARAM(point.x(), point.y()), &result)) {
1864 // First, give the NonClientView a chance to test the point to see if it
1865 // provides any of the non-client area.
1866 POINT temp = { point.x(), point.y() };
1867 MapWindowPoints(HWND_DESKTOP, hwnd(), &temp, 1);
1868 int component = delegate_->GetNonClientComponent(gfx::Point(temp));
1869 if (component != HTNOWHERE)
1872 // Otherwise, we let Windows do all the native frame non-client handling for
1874 #if defined(USE_AURA)
1875 LRESULT hit_test_code = DefWindowProc(hwnd(), WM_NCHITTEST, 0,
1876 MAKELPARAM(point.x(), point.y()));
1877 if (needs_scroll_styles_) {
1878 switch (hit_test_code) {
1879 // If we faked the WS_VSCROLL and WS_HSCROLL styles for this window, then
1880 // Windows returns the HTVSCROLL or HTHSCROLL hit test codes if we hover
1881 // or click on the non client portions of the window where the OS
1882 // scrollbars would be drawn. These hittest codes are returned even when
1883 // the scrollbars are hidden, which is the case in Aura. We fake the
1884 // hittest code as HTCLIENT in this case to ensure that we receive client
1885 // mouse messages as opposed to non client mouse messages.
1888 hit_test_code = HTCLIENT;
1891 case HTBOTTOMRIGHT: {
1892 // Normally the HTBOTTOMRIGHT hittest code is received when we hover
1893 // near the bottom right of the window. However due to our fake scroll
1894 // styles, we get this code even when we hover around the area where
1895 // the vertical scrollar down arrow would be drawn.
1896 // We check if the hittest coordinates lie in this region and if yes
1897 // we return HTCLIENT.
1898 int border_width = ::GetSystemMetrics(SM_CXSIZEFRAME);
1899 int border_height = ::GetSystemMetrics(SM_CYSIZEFRAME);
1900 int scroll_width = ::GetSystemMetrics(SM_CXVSCROLL);
1901 int scroll_height = ::GetSystemMetrics(SM_CYVSCROLL);
1903 ::GetWindowRect(hwnd(), &window_rect);
1904 window_rect.bottom -= border_height;
1905 window_rect.right -= border_width;
1906 window_rect.left = window_rect.right - scroll_width;
1907 window_rect.top = window_rect.bottom - scroll_height;
1911 if (::PtInRect(&window_rect, pt))
1912 hit_test_code = HTCLIENT;
1920 return hit_test_code;
1922 SetMsgHandled(FALSE);
1926 void HWNDMessageHandler::OnNCPaint(HRGN rgn) {
1927 // We only do non-client painting if we're not using the native frame.
1928 // It's required to avoid some native painting artifacts from appearing when
1929 // the window is resized.
1930 if (!delegate_->IsWidgetWindow() || !delegate_->IsUsingCustomFrame()) {
1931 SetMsgHandled(FALSE);
1935 // We have an NC region and need to paint it. We expand the NC region to
1936 // include the dirty region of the root view. This is done to minimize
1939 GetWindowRect(hwnd(), &window_rect);
1941 gfx::Size root_view_size = delegate_->GetRootViewSize();
1942 if (gfx::Size(window_rect.right - window_rect.left,
1943 window_rect.bottom - window_rect.top) != root_view_size) {
1944 // If the size of the window differs from the size of the root view it
1945 // means we're being asked to paint before we've gotten a WM_SIZE. This can
1946 // happen when the user is interactively resizing the window. To avoid
1947 // mass flickering we don't do anything here. Once we get the WM_SIZE we'll
1948 // reset the region of the window which triggers another WM_NCPAINT and
1954 // A value of 1 indicates paint all.
1955 if (!rgn || rgn == reinterpret_cast<HRGN>(1)) {
1956 dirty_region.left = 0;
1957 dirty_region.top = 0;
1958 dirty_region.right = window_rect.right - window_rect.left;
1959 dirty_region.bottom = window_rect.bottom - window_rect.top;
1961 RECT rgn_bounding_box;
1962 GetRgnBox(rgn, &rgn_bounding_box);
1963 if (!IntersectRect(&dirty_region, &rgn_bounding_box, &window_rect))
1964 return; // Dirty region doesn't intersect window bounds, bale.
1966 // rgn_bounding_box is in screen coordinates. Map it to window coordinates.
1967 OffsetRect(&dirty_region, -window_rect.left, -window_rect.top);
1970 // In theory GetDCEx should do what we want, but I couldn't get it to work.
1971 // In particular the docs mentiond DCX_CLIPCHILDREN, but as far as I can tell
1972 // it doesn't work at all. So, instead we get the DC for the window then
1973 // manually clip out the children.
1974 HDC dc = GetWindowDC(hwnd());
1975 ClipState clip_state;
1976 clip_state.x = window_rect.left;
1977 clip_state.y = window_rect.top;
1978 clip_state.parent = hwnd();
1980 EnumChildWindows(hwnd(), &ClipDCToChild,
1981 reinterpret_cast<LPARAM>(&clip_state));
1983 gfx::Rect old_paint_region = invalid_rect_;
1984 if (!old_paint_region.IsEmpty()) {
1985 // The root view has a region that needs to be painted. Include it in the
1986 // region we're going to paint.
1988 RECT old_paint_region_crect = old_paint_region.ToRECT();
1989 RECT tmp = dirty_region;
1990 UnionRect(&dirty_region, &tmp, &old_paint_region_crect);
1993 SchedulePaintInRect(gfx::Rect(dirty_region));
1995 // gfx::CanvasSkiaPaint's destructor does the actual painting. As such, wrap
1996 // the following in a block to force paint to occur so that we can release
1998 if (!delegate_->HandlePaintAccelerated(gfx::Rect(dirty_region))) {
1999 gfx::CanvasSkiaPaint canvas(dc,
2003 dirty_region.right - dirty_region.left,
2004 dirty_region.bottom - dirty_region.top);
2005 delegate_->HandlePaint(&canvas);
2008 ReleaseDC(hwnd(), dc);
2009 // When using a custom frame, we want to avoid calling DefWindowProc() since
2010 // that may render artifacts.
2011 SetMsgHandled(delegate_->IsUsingCustomFrame());
2014 LRESULT HWNDMessageHandler::OnNCUAHDrawCaption(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::OnNCUAHDrawFrame(UINT message,
2026 // See comment in widget_win.h at the definition of WM_NCUAHDRAWCAPTION for
2027 // an explanation about why we need to handle this message.
2028 SetMsgHandled(delegate_->IsUsingCustomFrame());
2032 LRESULT HWNDMessageHandler::OnNotify(int w_param, NMHDR* l_param) {
2033 LRESULT l_result = 0;
2034 SetMsgHandled(delegate_->HandleTooltipNotify(w_param, l_param, &l_result));
2038 void HWNDMessageHandler::OnPaint(HDC dc) {
2039 // Call BeginPaint()/EndPaint() around the paint handling, as that seems
2040 // to do more to actually validate the window's drawing region. This only
2041 // appears to matter for Windows that have the WS_EX_COMPOSITED style set
2042 // but will be valid in general too.
2044 HDC display_dc = BeginPaint(hwnd(), &ps);
2047 // Try to paint accelerated first.
2048 if (!IsRectEmpty(&ps.rcPaint) &&
2049 !delegate_->HandlePaintAccelerated(gfx::Rect(ps.rcPaint))) {
2050 #if defined(USE_AURA)
2051 delegate_->HandlePaint(NULL);
2053 scoped_ptr<gfx::CanvasSkiaPaint> canvas(
2054 new gfx::CanvasSkiaPaint(hwnd(), display_dc, ps));
2055 delegate_->HandlePaint(canvas.get());
2059 EndPaint(hwnd(), &ps);
2062 LRESULT HWNDMessageHandler::OnReflectedMessage(UINT message,
2065 SetMsgHandled(FALSE);
2069 LRESULT HWNDMessageHandler::OnScrollMessage(UINT message,
2072 MSG msg = { hwnd(), message, w_param, l_param, GetMessageTime() };
2073 ui::ScrollEvent event(msg);
2074 delegate_->HandleScrollEvent(event);
2078 void HWNDMessageHandler::OnSessionChange(WPARAM status_code,
2079 PWTSSESSION_NOTIFICATION session_id) {
2080 // Direct3D presents are ignored while the screen is locked, so force the
2081 // window to be redrawn on unlock.
2082 if (status_code == WTS_SESSION_UNLOCK)
2083 ForceRedrawWindow(10);
2085 SetMsgHandled(FALSE);
2088 LRESULT HWNDMessageHandler::OnSetCursor(UINT message,
2091 // Reimplement the necessary default behavior here. Calling DefWindowProc can
2092 // trigger weird non-client painting for non-glass windows with custom frames.
2093 // Using a ScopedRedrawLock to prevent caption rendering artifacts may allow
2094 // content behind this window to incorrectly paint in front of this window.
2095 // Invalidating the window to paint over either set of artifacts is not ideal.
2096 wchar_t* cursor = IDC_ARROW;
2097 switch (LOWORD(l_param)) {
2099 cursor = IDC_SIZENWSE;
2103 cursor = IDC_SIZEWE;
2107 cursor = IDC_SIZENS;
2111 cursor = IDC_SIZENWSE;
2115 cursor = IDC_SIZENESW;
2118 SetCursor(current_cursor_);
2121 // Use the default value, IDC_ARROW.
2124 ::SetCursor(LoadCursor(NULL, cursor));
2128 void HWNDMessageHandler::OnSetFocus(HWND last_focused_window) {
2129 delegate_->HandleNativeFocus(last_focused_window);
2130 SetMsgHandled(FALSE);
2133 LRESULT HWNDMessageHandler::OnSetIcon(UINT size_type, HICON new_icon) {
2134 // Use a ScopedRedrawLock to avoid weird non-client painting.
2135 return DefWindowProcWithRedrawLock(WM_SETICON, size_type,
2136 reinterpret_cast<LPARAM>(new_icon));
2139 LRESULT HWNDMessageHandler::OnSetText(const wchar_t* text) {
2140 // Use a ScopedRedrawLock to avoid weird non-client painting.
2141 return DefWindowProcWithRedrawLock(WM_SETTEXT, NULL,
2142 reinterpret_cast<LPARAM>(text));
2145 void HWNDMessageHandler::OnSettingChange(UINT flags, const wchar_t* section) {
2146 if (!GetParent(hwnd()) && (flags == SPI_SETWORKAREA) &&
2147 !delegate_->WillProcessWorkAreaChange()) {
2148 // Fire a dummy SetWindowPos() call, so we'll trip the code in
2149 // OnWindowPosChanging() below that notices work area changes.
2150 ::SetWindowPos(hwnd(), 0, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE |
2151 SWP_NOZORDER | SWP_NOREDRAW | SWP_NOACTIVATE | SWP_NOOWNERZORDER);
2152 SetMsgHandled(TRUE);
2154 if (flags == SPI_SETWORKAREA)
2155 delegate_->HandleWorkAreaChanged();
2156 SetMsgHandled(FALSE);
2160 void HWNDMessageHandler::OnSize(UINT param, const gfx::Size& size) {
2161 RedrawWindow(hwnd(), NULL, NULL, RDW_INVALIDATE | RDW_ALLCHILDREN);
2162 // ResetWindowRegion is going to trigger WM_NCPAINT. By doing it after we've
2163 // invoked OnSize we ensure the RootView has been laid out.
2164 ResetWindowRegion(false, true);
2166 #if defined(USE_AURA)
2167 // We add the WS_VSCROLL and WS_HSCROLL styles to top level windows to ensure
2168 // that legacy trackpad/trackpoint drivers generate the WM_VSCROLL and
2169 // WM_HSCROLL messages and scrolling works.
2170 // We want the scroll styles to be present on the window. However we don't
2171 // want Windows to draw the scrollbars. To achieve this we hide the scroll
2172 // bars and readd them to the window style in a posted task to ensure that we
2173 // don't get nested WM_SIZE messages.
2174 if (needs_scroll_styles_ && !in_size_loop_) {
2175 ShowScrollBar(hwnd(), SB_BOTH, FALSE);
2176 base::MessageLoop::current()->PostTask(
2177 FROM_HERE, base::Bind(&AddScrollStylesToWindow, hwnd()));
2182 void HWNDMessageHandler::OnSysCommand(UINT notification_code,
2183 const gfx::Point& point) {
2184 if (!delegate_->ShouldHandleSystemCommands())
2187 // Windows uses the 4 lower order bits of |notification_code| for type-
2188 // specific information so we must exclude this when comparing.
2189 static const int sc_mask = 0xFFF0;
2190 // Ignore size/move/maximize in fullscreen mode.
2191 if (fullscreen_handler_->fullscreen() &&
2192 (((notification_code & sc_mask) == SC_SIZE) ||
2193 ((notification_code & sc_mask) == SC_MOVE) ||
2194 ((notification_code & sc_mask) == SC_MAXIMIZE)))
2196 if (delegate_->IsUsingCustomFrame()) {
2197 if ((notification_code & sc_mask) == SC_MINIMIZE ||
2198 (notification_code & sc_mask) == SC_MAXIMIZE ||
2199 (notification_code & sc_mask) == SC_RESTORE) {
2200 delegate_->ResetWindowControls();
2201 } else if ((notification_code & sc_mask) == SC_MOVE ||
2202 (notification_code & sc_mask) == SC_SIZE) {
2204 // Circumvent ScopedRedrawLocks and force visibility before entering a
2205 // resize or move modal loop to get continuous sizing/moving feedback.
2206 SetWindowLong(hwnd(), GWL_STYLE,
2207 GetWindowLong(hwnd(), GWL_STYLE) | WS_VISIBLE);
2212 // Handle SC_KEYMENU, which means that the user has pressed the ALT
2213 // key and released it, so we should focus the menu bar.
2214 if ((notification_code & sc_mask) == SC_KEYMENU && point.x() == 0) {
2215 int modifiers = ui::EF_NONE;
2216 if (base::win::IsShiftPressed())
2217 modifiers |= ui::EF_SHIFT_DOWN;
2218 if (base::win::IsCtrlPressed())
2219 modifiers |= ui::EF_CONTROL_DOWN;
2220 // Retrieve the status of shift and control keys to prevent consuming
2221 // shift+alt keys, which are used by Windows to change input languages.
2222 ui::Accelerator accelerator(ui::KeyboardCodeForWindowsKeyCode(VK_MENU),
2224 delegate_->HandleAccelerator(accelerator);
2228 // If the delegate can't handle it, the system implementation will be called.
2229 if (!delegate_->HandleCommand(notification_code)) {
2230 // If the window is being resized by dragging the borders of the window
2231 // with the mouse/touch/keyboard, we flag as being in a size loop.
2232 if ((notification_code & sc_mask) == SC_SIZE)
2233 in_size_loop_ = true;
2234 DefWindowProc(hwnd(), WM_SYSCOMMAND, notification_code,
2235 MAKELPARAM(point.x(), point.y()));
2236 in_size_loop_ = false;
2240 void HWNDMessageHandler::OnThemeChanged() {
2241 ui::NativeThemeWin::instance()->CloseHandles();
2244 LRESULT HWNDMessageHandler::OnTouchEvent(UINT message,
2247 // Handle touch events only on Aura for now.
2248 #if !defined(USE_AURA)
2249 SetMsgHandled(FALSE);
2252 int num_points = LOWORD(w_param);
2253 scoped_ptr<TOUCHINPUT[]> input(new TOUCHINPUT[num_points]);
2254 if (ui::GetTouchInputInfoWrapper(reinterpret_cast<HTOUCHINPUT>(l_param),
2255 num_points, input.get(),
2256 sizeof(TOUCHINPUT))) {
2257 int flags = ui::GetModifiersFromKeyState();
2258 TouchEvents touch_events;
2259 for (int i = 0; i < num_points; ++i) {
2260 ui::EventType touch_event_type = ui::ET_UNKNOWN;
2262 if (input[i].dwFlags & TOUCHEVENTF_DOWN) {
2263 touch_ids_.insert(input[i].dwID);
2264 touch_event_type = ui::ET_TOUCH_PRESSED;
2265 } else if (input[i].dwFlags & TOUCHEVENTF_UP) {
2266 touch_ids_.erase(input[i].dwID);
2267 touch_event_type = ui::ET_TOUCH_RELEASED;
2268 } else if (input[i].dwFlags & TOUCHEVENTF_MOVE) {
2269 touch_event_type = ui::ET_TOUCH_MOVED;
2271 if (touch_event_type != ui::ET_UNKNOWN) {
2273 point.x = TOUCH_COORD_TO_PIXEL(input[i].x) /
2274 gfx::win::GetUndocumentedDPITouchScale();
2275 point.y = TOUCH_COORD_TO_PIXEL(input[i].y) /
2276 gfx::win::GetUndocumentedDPITouchScale();
2278 ScreenToClient(hwnd(), &point);
2280 ui::TouchEvent event(
2282 gfx::Point(point.x, point.y),
2283 id_generator_.GetGeneratedID(input[i].dwID),
2284 base::TimeDelta::FromMilliseconds(input[i].dwTime));
2285 event.set_flags(flags);
2286 touch_events.push_back(event);
2287 if (touch_event_type == ui::ET_TOUCH_RELEASED)
2288 id_generator_.ReleaseNumber(input[i].dwID);
2291 // Handle the touch events asynchronously. We need this because touch
2292 // events on windows don't fire if we enter a modal loop in the context of
2294 base::MessageLoop::current()->PostTask(
2296 base::Bind(&HWNDMessageHandler::HandleTouchEvents,
2297 weak_factory_.GetWeakPtr(), touch_events));
2299 CloseTouchInputHandle(reinterpret_cast<HTOUCHINPUT>(l_param));
2300 SetMsgHandled(FALSE);
2304 void HWNDMessageHandler::OnWindowPosChanging(WINDOWPOS* window_pos) {
2305 if (ignore_window_pos_changes_) {
2306 // If somebody's trying to toggle our visibility, change the nonclient area,
2307 // change our Z-order, or activate us, we should probably let it go through.
2308 if (!(window_pos->flags & ((IsVisible() ? SWP_HIDEWINDOW : SWP_SHOWWINDOW) |
2309 SWP_FRAMECHANGED)) &&
2310 (window_pos->flags & (SWP_NOZORDER | SWP_NOACTIVATE))) {
2311 // Just sizing/moving the window; ignore.
2312 window_pos->flags |= SWP_NOSIZE | SWP_NOMOVE | SWP_NOREDRAW;
2313 window_pos->flags &= ~(SWP_SHOWWINDOW | SWP_HIDEWINDOW);
2315 } else if (!GetParent(hwnd())) {
2318 gfx::Rect monitor_rect, work_area;
2319 if (GetWindowRect(hwnd(), &window_rect) &&
2320 GetMonitorAndRects(window_rect, &monitor, &monitor_rect, &work_area)) {
2321 bool work_area_changed = (monitor_rect == last_monitor_rect_) &&
2322 (work_area != last_work_area_);
2323 if (monitor && (monitor == last_monitor_) &&
2324 ((fullscreen_handler_->fullscreen() &&
2325 !fullscreen_handler_->metro_snap()) ||
2326 work_area_changed)) {
2327 // A rect for the monitor we're on changed. Normally Windows notifies
2328 // us about this (and thus we're reaching here due to the SetWindowPos()
2329 // call in OnSettingChange() above), but with some software (e.g.
2330 // nVidia's nView desktop manager) the work area can change asynchronous
2331 // to any notification, and we're just sent a SetWindowPos() call with a
2332 // new (frequently incorrect) position/size. In either case, the best
2333 // response is to throw away the existing position/size information in
2334 // |window_pos| and recalculate it based on the new work rect.
2335 gfx::Rect new_window_rect;
2336 if (fullscreen_handler_->fullscreen()) {
2337 new_window_rect = monitor_rect;
2338 } else if (IsMaximized()) {
2339 new_window_rect = work_area;
2340 int border_thickness = GetSystemMetrics(SM_CXSIZEFRAME);
2341 new_window_rect.Inset(-border_thickness, -border_thickness);
2343 new_window_rect = gfx::Rect(window_rect);
2344 new_window_rect.AdjustToFit(work_area);
2346 window_pos->x = new_window_rect.x();
2347 window_pos->y = new_window_rect.y();
2348 window_pos->cx = new_window_rect.width();
2349 window_pos->cy = new_window_rect.height();
2350 // WARNING! Don't set SWP_FRAMECHANGED here, it breaks moving the child
2351 // HWNDs for some reason.
2352 window_pos->flags &= ~(SWP_NOSIZE | SWP_NOMOVE | SWP_NOREDRAW);
2353 window_pos->flags |= SWP_NOCOPYBITS;
2355 // Now ignore all immediately-following SetWindowPos() changes. Windows
2356 // likes to (incorrectly) recalculate what our position/size should be
2357 // and send us further updates.
2358 ignore_window_pos_changes_ = true;
2359 base::MessageLoop::current()->PostTask(
2361 base::Bind(&HWNDMessageHandler::StopIgnoringPosChanges,
2362 weak_factory_.GetWeakPtr()));
2364 last_monitor_ = monitor;
2365 last_monitor_rect_ = monitor_rect;
2366 last_work_area_ = work_area;
2370 if (ScopedFullscreenVisibility::IsHiddenForFullscreen(hwnd())) {
2371 // Prevent the window from being made visible if we've been asked to do so.
2372 // See comment in header as to why we might want this.
2373 window_pos->flags &= ~SWP_SHOWWINDOW;
2376 if (window_pos->flags & SWP_SHOWWINDOW)
2377 delegate_->HandleVisibilityChanging(true);
2378 else if (window_pos->flags & SWP_HIDEWINDOW)
2379 delegate_->HandleVisibilityChanging(false);
2381 SetMsgHandled(FALSE);
2384 void HWNDMessageHandler::OnWindowPosChanged(WINDOWPOS* window_pos) {
2385 if (DidClientAreaSizeChange(window_pos))
2386 ClientAreaSizeChanged();
2387 if (remove_standard_frame_ && window_pos->flags & SWP_FRAMECHANGED &&
2388 ui::win::IsAeroGlassEnabled() &&
2389 (window_ex_style() & WS_EX_COMPOSITED) == 0) {
2390 MARGINS m = {10, 10, 10, 10};
2391 DwmExtendFrameIntoClientArea(hwnd(), &m);
2393 if (window_pos->flags & SWP_SHOWWINDOW)
2394 delegate_->HandleVisibilityChanged(true);
2395 else if (window_pos->flags & SWP_HIDEWINDOW)
2396 delegate_->HandleVisibilityChanged(false);
2397 SetMsgHandled(FALSE);
2400 void HWNDMessageHandler::HandleTouchEvents(const TouchEvents& touch_events) {
2401 base::WeakPtr<HWNDMessageHandler> ref(weak_factory_.GetWeakPtr());
2402 for (size_t i = 0; i < touch_events.size() && ref; ++i)
2403 delegate_->HandleTouchEvent(touch_events[i]);
2406 } // namespace views