Upstream version 7.36.149.0
[platform/framework/web/crosswalk.git] / src / chrome / browser / ui / views / panels / panel_view.cc
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.
4
5 #include "chrome/browser/ui/views/panels/panel_view.h"
6
7 #include <map>
8 #include "base/logging.h"
9 #include "base/message_loop/message_loop.h"
10 #include "base/strings/utf_string_conversions.h"
11 #include "chrome/app/chrome_command_ids.h"
12 #include "chrome/browser/profiles/profile.h"
13 #include "chrome/browser/ui/host_desktop.h"
14 #include "chrome/browser/ui/panels/panel.h"
15 #include "chrome/browser/ui/panels/panel_bounds_animation.h"
16 #include "chrome/browser/ui/panels/panel_manager.h"
17 #include "chrome/browser/ui/panels/stacked_panel_collection.h"
18 #include "chrome/browser/ui/views/auto_keep_alive.h"
19 #include "chrome/browser/ui/views/panels/panel_frame_view.h"
20 #include "content/public/browser/render_view_host.h"
21 #include "content/public/browser/render_widget_host_view.h"
22 #include "content/public/browser/web_contents.h"
23 #include "ui/gfx/image/image.h"
24 #include "ui/gfx/path.h"
25 #include "ui/gfx/screen.h"
26 #include "ui/views/controls/button/image_button.h"
27 #include "ui/views/controls/webview/webview.h"
28 #include "ui/views/widget/widget.h"
29
30 #if defined(OS_WIN)
31 #include "base/win/windows_version.h"
32 #include "chrome/browser/shell_integration.h"
33 #include "chrome/browser/ui/views/panels/taskbar_window_thumbnailer_win.h"
34 #include "ui/base/win/shell.h"
35 #include "ui/gfx/icon_util.h"
36 #include "ui/views/win/hwnd_util.h"
37 #endif
38
39 namespace {
40
41 #if defined(OS_WIN)
42 // If the height of a stacked panel shrinks below this threshold during the
43 // user resizing, it will be treated as minimized.
44 const int kStackedPanelHeightShrinkThresholdToBecomeMinimized =
45     panel::kTitlebarHeight + 20;
46 #endif
47
48 // Supported accelerators.
49 // Note: We can't use the acclerator table defined in chrome/browser/ui/views
50 // due to checkdeps violation.
51 struct AcceleratorMapping {
52   ui::KeyboardCode keycode;
53   int modifiers;
54   int command_id;
55 };
56 const AcceleratorMapping kPanelAcceleratorMap[] = {
57   { ui::VKEY_W, ui::EF_CONTROL_DOWN, IDC_CLOSE_WINDOW },
58   { ui::VKEY_W, ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN, IDC_CLOSE_WINDOW },
59   { ui::VKEY_F4, ui::EF_ALT_DOWN, IDC_CLOSE_WINDOW },
60   { ui::VKEY_R, ui::EF_CONTROL_DOWN, IDC_RELOAD },
61   { ui::VKEY_F5, ui::EF_NONE, IDC_RELOAD },
62   { ui::VKEY_R, ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN,
63       IDC_RELOAD_IGNORING_CACHE },
64   { ui::VKEY_F5, ui::EF_CONTROL_DOWN, IDC_RELOAD_IGNORING_CACHE },
65   { ui::VKEY_F5, ui::EF_SHIFT_DOWN, IDC_RELOAD_IGNORING_CACHE },
66   { ui::VKEY_ESCAPE, ui::EF_NONE, IDC_STOP },
67   { ui::VKEY_OEM_MINUS, ui::EF_CONTROL_DOWN, IDC_ZOOM_MINUS },
68   { ui::VKEY_SUBTRACT, ui::EF_CONTROL_DOWN, IDC_ZOOM_MINUS },
69   { ui::VKEY_0, ui::EF_CONTROL_DOWN, IDC_ZOOM_NORMAL },
70   { ui::VKEY_NUMPAD0, ui::EF_CONTROL_DOWN, IDC_ZOOM_NORMAL },
71   { ui::VKEY_OEM_PLUS, ui::EF_CONTROL_DOWN, IDC_ZOOM_PLUS },
72   { ui::VKEY_ADD, ui::EF_CONTROL_DOWN, IDC_ZOOM_PLUS },
73   { ui::VKEY_I, ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN, IDC_DEV_TOOLS },
74   { ui::VKEY_J, ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN,
75     IDC_DEV_TOOLS_CONSOLE },
76 };
77
78 const std::map<ui::Accelerator, int>& GetAcceleratorTable() {
79   static std::map<ui::Accelerator, int>* accelerators = NULL;
80   if (!accelerators) {
81     accelerators = new std::map<ui::Accelerator, int>();
82     for (size_t i = 0; i < arraysize(kPanelAcceleratorMap); ++i) {
83       ui::Accelerator accelerator(kPanelAcceleratorMap[i].keycode,
84                                   kPanelAcceleratorMap[i].modifiers);
85       (*accelerators)[accelerator] = kPanelAcceleratorMap[i].command_id;
86     }
87   }
88   return *accelerators;
89 }
90
91 // NativePanelTesting implementation.
92 class NativePanelTestingWin : public NativePanelTesting {
93  public:
94   explicit NativePanelTestingWin(PanelView* panel_view);
95
96  private:
97   virtual void PressLeftMouseButtonTitlebar(
98       const gfx::Point& mouse_location, panel::ClickModifier modifier) OVERRIDE;
99   virtual void ReleaseMouseButtonTitlebar(
100       panel::ClickModifier modifier) OVERRIDE;
101   virtual void DragTitlebar(const gfx::Point& mouse_location) OVERRIDE;
102   virtual void CancelDragTitlebar() OVERRIDE;
103   virtual void FinishDragTitlebar() OVERRIDE;
104   virtual bool VerifyDrawingAttention() const OVERRIDE;
105   virtual bool VerifyActiveState(bool is_active) OVERRIDE;
106   virtual bool VerifyAppIcon() const OVERRIDE;
107   virtual bool VerifySystemMinimizeState() const OVERRIDE;
108   virtual bool IsWindowVisible() const OVERRIDE;
109   virtual bool IsWindowSizeKnown() const OVERRIDE;
110   virtual bool IsAnimatingBounds() const OVERRIDE;
111   virtual bool IsButtonVisible(
112       panel::TitlebarButtonType button_type) const OVERRIDE;
113   virtual panel::CornerStyle GetWindowCornerStyle() const OVERRIDE;
114   virtual bool EnsureApplicationRunOnForeground() OVERRIDE;
115
116   PanelView* panel_view_;
117 };
118
119 NativePanelTestingWin::NativePanelTestingWin(PanelView* panel_view)
120     : panel_view_(panel_view) {
121 }
122
123 void NativePanelTestingWin::PressLeftMouseButtonTitlebar(
124     const gfx::Point& mouse_location, panel::ClickModifier modifier) {
125   panel_view_->OnTitlebarMousePressed(mouse_location);
126 }
127
128 void NativePanelTestingWin::ReleaseMouseButtonTitlebar(
129     panel::ClickModifier modifier) {
130   panel_view_->OnTitlebarMouseReleased(modifier);
131 }
132
133 void NativePanelTestingWin::DragTitlebar(const gfx::Point& mouse_location) {
134   panel_view_->OnTitlebarMouseDragged(mouse_location);
135 }
136
137 void NativePanelTestingWin::CancelDragTitlebar() {
138   panel_view_->OnTitlebarMouseCaptureLost();
139 }
140
141 void NativePanelTestingWin::FinishDragTitlebar() {
142   panel_view_->OnTitlebarMouseReleased(panel::NO_MODIFIER);
143 }
144
145 bool NativePanelTestingWin::VerifyDrawingAttention() const {
146   base::MessageLoop::current()->RunUntilIdle();
147   return panel_view_->GetFrameView()->GetPaintState() ==
148          PanelFrameView::PAINT_FOR_ATTENTION;
149 }
150
151 bool NativePanelTestingWin::VerifyActiveState(bool is_active) {
152   return panel_view_->GetFrameView()->GetPaintState() ==
153          (is_active ? PanelFrameView::PAINT_AS_ACTIVE
154                     : PanelFrameView::PAINT_AS_INACTIVE);
155 }
156
157 bool NativePanelTestingWin::VerifyAppIcon() const {
158 #if defined(OS_WIN)
159   // We only care about Windows 7 and later.
160   if (base::win::GetVersion() < base::win::VERSION_WIN7)
161     return true;
162
163   HWND native_window = views::HWNDForWidget(panel_view_->window());
164   HICON app_icon = reinterpret_cast<HICON>(
165       ::SendMessage(native_window, WM_GETICON, ICON_BIG, 0L));
166   if (!app_icon)
167     return false;
168   scoped_ptr<SkBitmap> bitmap(IconUtil::CreateSkBitmapFromHICON(app_icon));
169   return bitmap.get() &&
170          bitmap->width() == panel::kPanelAppIconSize &&
171          bitmap->height() == panel::kPanelAppIconSize;
172 #else
173   return true;
174 #endif
175 }
176
177 bool NativePanelTestingWin::VerifySystemMinimizeState() const {
178 #if defined(OS_WIN)
179   HWND native_window = views::HWNDForWidget(panel_view_->window());
180   WINDOWPLACEMENT placement;
181   if (!::GetWindowPlacement(native_window, &placement))
182     return false;
183   if (placement.showCmd == SW_MINIMIZE || placement.showCmd == SW_SHOWMINIMIZED)
184     return true;
185
186   // If the panel window has owner window, as in stacked mode, check its owner
187   // window. Note that owner window, instead of parent window, is returned
188   // though GWL_HWNDPARENT contains 'parent'.
189   HWND owner_window =
190       reinterpret_cast<HWND>(::GetWindowLongPtr(native_window,
191                                                 GWLP_HWNDPARENT));
192   if (!owner_window || !::GetWindowPlacement(owner_window, &placement))
193     return false;
194   return placement.showCmd == SW_MINIMIZE ||
195          placement.showCmd == SW_SHOWMINIMIZED;
196 #else
197   return true;
198 #endif
199 }
200
201 bool NativePanelTestingWin::IsWindowVisible() const {
202 #if defined(OS_WIN)
203   HWND native_window = views::HWNDForWidget(panel_view_->window());
204   return ::IsWindowVisible(native_window) == TRUE;
205 #else
206   return panel_view_->visible();
207 #endif
208 }
209
210 bool NativePanelTestingWin::IsWindowSizeKnown() const {
211   return true;
212 }
213
214 bool NativePanelTestingWin::IsAnimatingBounds() const {
215   return panel_view_->IsAnimatingBounds();
216 }
217
218 bool NativePanelTestingWin::IsButtonVisible(
219     panel::TitlebarButtonType button_type) const {
220   PanelFrameView* frame_view = panel_view_->GetFrameView();
221
222   switch (button_type) {
223     case panel::CLOSE_BUTTON:
224       return frame_view->close_button()->visible();
225     case panel::MINIMIZE_BUTTON:
226       return frame_view->minimize_button()->visible();
227     case panel::RESTORE_BUTTON:
228       return frame_view->restore_button()->visible();
229     default:
230       NOTREACHED();
231   }
232   return false;
233 }
234
235 panel::CornerStyle NativePanelTestingWin::GetWindowCornerStyle() const {
236   return panel_view_->GetFrameView()->corner_style();
237 }
238
239 bool NativePanelTestingWin::EnsureApplicationRunOnForeground() {
240   // Not needed on views.
241   return true;
242 }
243
244 }  // namespace
245
246 // static
247 NativePanel* Panel::CreateNativePanel(Panel* panel,
248                                       const gfx::Rect& bounds,
249                                       bool always_on_top) {
250   return new PanelView(panel, bounds, always_on_top);
251 }
252
253 // The panel window has to be created as always-on-top. We cannot create it
254 // as non-always-on-top and then change it to always-on-top because Windows
255 // system might deny making a window always-on-top if the application is not
256 // a foreground application.
257 PanelView::PanelView(Panel* panel, const gfx::Rect& bounds, bool always_on_top)
258     : panel_(panel),
259       bounds_(bounds),
260       window_(NULL),
261       window_closed_(false),
262       web_view_(NULL),
263       always_on_top_(always_on_top),
264       focused_(false),
265       user_resizing_(false),
266 #if defined(OS_WIN)
267       user_resizing_interior_stacked_panel_edge_(false),
268 #endif
269       mouse_pressed_(false),
270       mouse_dragging_state_(NO_DRAGGING),
271       is_drawing_attention_(false),
272       force_to_paint_as_inactive_(false),
273       old_focused_view_(NULL) {
274   window_ = new views::Widget;
275   views::Widget::InitParams params(views::Widget::InitParams::TYPE_WINDOW);
276   params.delegate = this;
277   params.remove_standard_frame = true;
278   params.keep_on_top = always_on_top;
279   params.visible_on_all_workspaces = always_on_top;
280   params.bounds = bounds;
281   window_->Init(params);
282   window_->set_frame_type(views::Widget::FRAME_TYPE_FORCE_CUSTOM);
283   window_->set_focus_on_creation(false);
284   window_->AddObserver(this);
285
286   // Prevent the browser process from shutting down while this window is open.
287   keep_alive_.reset(new AutoKeepAlive(GetNativePanelWindow()));
288
289   web_view_ = new views::WebView(NULL);
290   AddChildView(web_view_);
291
292   // Register accelarators supported by panels.
293   views::FocusManager* focus_manager = GetFocusManager();
294   const std::map<ui::Accelerator, int>& accelerator_table =
295       GetAcceleratorTable();
296   for (std::map<ui::Accelerator, int>::const_iterator iter =
297            accelerator_table.begin();
298        iter != accelerator_table.end(); ++iter) {
299     focus_manager->RegisterAccelerator(
300         iter->first, ui::AcceleratorManager::kNormalPriority, this);
301   }
302
303 #if defined(OS_WIN)
304   ui::win::SetAppIdForWindow(
305       ShellIntegration::GetAppModelIdForProfile(
306           base::UTF8ToWide(panel->app_name()), panel->profile()->GetPath()),
307       views::HWNDForWidget(window_));
308   ui::win::PreventWindowFromPinning(views::HWNDForWidget(window_));
309 #endif
310 }
311
312 PanelView::~PanelView() {
313 }
314
315 void PanelView::ShowPanel() {
316   ShowPanelInactive();
317   ActivatePanel();
318 }
319
320 void PanelView::ShowPanelInactive() {
321   if (window_->IsVisible())
322     return;
323   window_->ShowInactive();
324   // No animation is used for initial creation of a panel on Win.
325   // Signal immediately that pending actions can be performed.
326   panel_->manager()->OnPanelAnimationEnded(panel_.get());
327 }
328
329 gfx::Rect PanelView::GetPanelBounds() const {
330   return bounds_;
331 }
332
333 void PanelView::SetPanelBounds(const gfx::Rect& bounds) {
334   SetBoundsInternal(bounds, true);
335 }
336
337 void PanelView::SetPanelBoundsInstantly(const gfx::Rect& bounds) {
338   SetBoundsInternal(bounds, false);
339 }
340
341 void PanelView::SetBoundsInternal(const gfx::Rect& new_bounds, bool animate) {
342   if (bounds_ == new_bounds)
343     return;
344
345   bounds_ = new_bounds;
346
347   if (!animate) {
348     // If no animation is in progress, apply bounds change instantly. Otherwise,
349     // continue the animation with new target bounds.
350     if (!IsAnimatingBounds())
351       SetWidgetBounds(bounds_);
352     return;
353   }
354
355   animation_start_bounds_ = window_->GetWindowBoundsInScreen();
356
357   bounds_animator_.reset(new PanelBoundsAnimation(
358       this, panel_.get(), animation_start_bounds_, new_bounds));
359   bounds_animator_->Start();
360 }
361
362 #if defined(OS_WIN)
363 bool PanelView::FilterMessage(HWND hwnd,
364                               UINT message,
365                               WPARAM w_param,
366                               LPARAM l_param,
367                               LRESULT* l_result) {
368   switch (message) {
369     case WM_SIZING:
370       if (w_param == WMSZ_BOTTOM)
371         user_resizing_interior_stacked_panel_edge_ = true;
372       break;
373   }
374   return false;
375 }
376 #endif
377
378 void PanelView::AnimationEnded(const gfx::Animation* animation) {
379   panel_->manager()->OnPanelAnimationEnded(panel_.get());
380 }
381
382 void PanelView::AnimationProgressed(const gfx::Animation* animation) {
383   gfx::Rect new_bounds = bounds_animator_->CurrentValueBetween(
384       animation_start_bounds_, bounds_);
385   SetWidgetBounds(new_bounds);
386 }
387
388 void PanelView::SetWidgetBounds(const gfx::Rect& new_bounds) {
389 #if defined(OS_WIN)
390   // An overlapped window is a top-level window that has a titlebar, border,
391   // and client area. The Windows system will automatically put the shadow
392   // around the whole window. Also the system will enforce the minimum height
393   // (38 pixels based on observation) for the overlapped window such that it
394   // will always has the space for the titlebar.
395   //
396   // On contrast, a popup window is a bare minimum window without border and
397   // titlebar by default. It is often used for the popup menu and the window
398   // with short life. The Windows system does not add the shadow around the
399   // whole window though CS_DROPSHADOW class style could be passed to add the
400   // drop shadow which is only around the right and bottom edges.
401   //
402   // The height of the title-only or minimized panel is smaller than the minimum
403   // overlapped window height. If the panel still uses the overlapped window
404   // style, Windows system will automatically increase the window height. To
405   // work around this limitation, we temporarily change the window style to
406   // popup when the height to set is smaller than the minimum overlapped window
407   // height and then restore the window style to overlapped when the height
408   // grows.
409   static const int kMinimumOverlappedWindowHeight = 38;
410   gfx::Rect old_bounds = GetWidget()->GetRestoredBounds();
411   if (old_bounds.height() > kMinimumOverlappedWindowHeight &&
412       new_bounds.height() <= kMinimumOverlappedWindowHeight) {
413     // When the panel height shrinks below the minimum overlapped window height,
414     // change the window style to popup such that we can show the title-only
415     // and minimized panel without additional height being added by the system.
416     UpdateWindowAttribute(GWL_STYLE,
417                           WS_POPUP,
418                           WS_OVERLAPPED | WS_THICKFRAME | WS_SYSMENU,
419                           true);
420   } else if (old_bounds.height() <= kMinimumOverlappedWindowHeight &&
421              new_bounds.height() > kMinimumOverlappedWindowHeight) {
422     // Change the window style back to overlappped when the panel height grow
423     // taller than the minimum overlapped window height.
424     UpdateWindowAttribute(GWL_STYLE,
425                           WS_OVERLAPPED | WS_THICKFRAME | WS_SYSMENU,
426                           WS_POPUP,
427                           true);
428   }
429 #endif
430
431   GetWidget()->SetBounds(new_bounds);
432 }
433
434 void PanelView::ClosePanel() {
435   // We're already closing. Do nothing.
436   if (window_closed_)
437     return;
438
439   if (!panel_->ShouldCloseWindow())
440     return;
441
442   // Cancel any currently running animation since we're closing down.
443   if (bounds_animator_.get())
444     bounds_animator_.reset();
445
446   if (panel_->GetWebContents()) {
447     // Still have web contents. Allow renderer to shut down.
448     // When web contents are destroyed, we will be called back again.
449     panel_->OnWindowClosing();
450     return;
451   }
452
453   panel_->OnNativePanelClosed();
454   if (window_)
455     window_->Close();
456   window_closed_ = true;
457 }
458
459 void PanelView::ActivatePanel() {
460   window_->Activate();
461 }
462
463 void PanelView::DeactivatePanel() {
464   if (!focused_)
465     return;
466
467 #if defined(OS_WIN)
468   // Need custom behavior for always-on-top panels to avoid
469   // the OS activating a minimized panel when this one is
470   // deactivated.
471   if (always_on_top_) {
472     ::SetForegroundWindow(::GetDesktopWindow());
473     return;
474   }
475 #endif
476
477   window_->Deactivate();
478 }
479
480 bool PanelView::IsPanelActive() const {
481   return focused_;
482 }
483
484 void PanelView::PreventActivationByOS(bool prevent_activation) {
485 #if defined(OS_WIN)
486   // Set the flags "NoActivate" to make sure the minimized panels do not get
487   // activated by the OS. In addition, set "AppWindow" to make sure the
488   // minimized panels do appear in the taskbar and Alt-Tab menu if it is not
489   // in a stack.
490   int value_to_change = WS_EX_NOACTIVATE;
491   if (!panel_->stack())
492     value_to_change |= WS_EX_APPWINDOW;
493   if (prevent_activation)
494     UpdateWindowAttribute(GWL_EXSTYLE, value_to_change, 0, false);
495   else
496     UpdateWindowAttribute(GWL_EXSTYLE, 0, value_to_change, false);
497 #endif
498 }
499
500 gfx::NativeWindow PanelView::GetNativePanelWindow() {
501   return window_->GetNativeWindow();
502 }
503
504 void PanelView::UpdatePanelTitleBar() {
505   UpdateWindowTitle();
506   UpdateWindowIcon();
507 }
508
509 void PanelView::UpdatePanelLoadingAnimations(bool should_animate) {
510   GetFrameView()->UpdateThrobber();
511 }
512
513 void PanelView::PanelWebContentsFocused(content::WebContents* contents) {
514   web_view_->OnWebContentsFocused(contents);
515 }
516
517 void PanelView::PanelCut() {
518   // Nothing to do since we do not have panel-specific system menu.
519   NOTREACHED();
520 }
521
522 void PanelView::PanelCopy() {
523   // Nothing to do since we do not have panel-specific system menu.
524   NOTREACHED();
525 }
526
527 void PanelView::PanelPaste() {
528   // Nothing to do since we do not have panel-specific system menu.
529   NOTREACHED();
530 }
531
532 void PanelView::DrawAttention(bool draw_attention) {
533   DCHECK((panel_->attention_mode() & Panel::USE_PANEL_ATTENTION) != 0);
534
535   if (is_drawing_attention_ == draw_attention)
536     return;
537   is_drawing_attention_ = draw_attention;
538   GetFrameView()->SchedulePaint();
539
540   if ((panel_->attention_mode() & Panel::USE_SYSTEM_ATTENTION) != 0) {
541 #if defined(OS_WIN)
542     // The default implementation of Widget::FlashFrame only flashes 5 times.
543     // We need more than that.
544     FLASHWINFO fwi;
545     fwi.cbSize = sizeof(fwi);
546     fwi.hwnd = views::HWNDForWidget(window_);
547     if (draw_attention) {
548       fwi.dwFlags = FLASHW_ALL;
549       fwi.uCount = panel::kNumberOfTimesToFlashPanelForAttention;
550       fwi.dwTimeout = 0;
551     } else {
552       // TODO(jianli): calling FlashWindowEx with FLASHW_STOP flag for the
553       // panel window has the same problem as the stack window. However,
554       // we cannot take the similar fix since there is no background window
555       // to replace for the regular panel window. More investigation is needed.
556       fwi.dwFlags = FLASHW_STOP;
557     }
558     ::FlashWindowEx(&fwi);
559 #else
560     window_->FlashFrame(draw_attention);
561 #endif
562   }
563 }
564
565 bool PanelView::IsDrawingAttention() const {
566   return is_drawing_attention_;
567 }
568
569 void PanelView::HandlePanelKeyboardEvent(
570     const content::NativeWebKeyboardEvent& event) {
571   views::FocusManager* focus_manager = GetFocusManager();
572   if (focus_manager->shortcut_handling_suspended())
573     return;
574
575   ui::Accelerator accelerator(
576       static_cast<ui::KeyboardCode>(event.windowsKeyCode),
577       content::GetModifiersFromNativeWebKeyboardEvent(event));
578   if (event.type == blink::WebInputEvent::KeyUp)
579     accelerator.set_type(ui::ET_KEY_RELEASED);
580   focus_manager->ProcessAccelerator(accelerator);
581 }
582
583 void PanelView::FullScreenModeChanged(bool is_full_screen) {
584   if (is_full_screen) {
585     if (window_->IsVisible() && always_on_top_)
586       window_->Hide();
587   } else {
588     if (!window_->IsVisible()) {
589       ShowPanelInactive();
590
591 #if defined(OS_WIN)
592       // When hiding and showing again a top-most window that belongs to a
593       // background application (i.e. the application is not a foreground one),
594       // the window may loose top-most placement even though its WS_EX_TOPMOST
595       // bit is still set. Re-issuing SetWindowsPos() returns the window to its
596       // top-most placement.
597       if (always_on_top_)
598         window_->SetAlwaysOnTop(true);
599 #endif
600     }
601   }
602 }
603
604 bool PanelView::IsPanelAlwaysOnTop() const {
605   return always_on_top_;
606 }
607
608 void PanelView::SetPanelAlwaysOnTop(bool on_top) {
609   if (always_on_top_ == on_top)
610     return;
611   always_on_top_ = on_top;
612
613   window_->SetAlwaysOnTop(on_top);
614   window_->SetVisibleOnAllWorkspaces(on_top);
615   window_->non_client_view()->Layout();
616   window_->client_view()->Layout();
617 }
618
619 void PanelView::UpdatePanelMinimizeRestoreButtonVisibility() {
620   GetFrameView()->UpdateTitlebarMinimizeRestoreButtonVisibility();
621 }
622
623 void PanelView::SetWindowCornerStyle(panel::CornerStyle corner_style) {
624   GetFrameView()->SetWindowCornerStyle(corner_style);
625 }
626
627 void PanelView::PanelExpansionStateChanging(Panel::ExpansionState old_state,
628                                             Panel::ExpansionState new_state) {
629 #if defined(OS_WIN)
630   // Live preview is only available since Windows 7.
631   if (base::win::GetVersion() < base::win::VERSION_WIN7)
632     return;
633
634   if (panel_->collection()->type() != PanelCollection::DOCKED)
635     return;
636
637   bool is_minimized = old_state != Panel::EXPANDED;
638   bool will_be_minimized = new_state != Panel::EXPANDED;
639   if (is_minimized == will_be_minimized)
640     return;
641
642   HWND native_window = views::HWNDForWidget(window_);
643
644   if (!thumbnailer_.get()) {
645     DCHECK(native_window);
646     thumbnailer_.reset(new TaskbarWindowThumbnailerWin(native_window, NULL));
647   }
648
649   // Cache the image at this point.
650   if (will_be_minimized) {
651     // If the panel is still active (we will deactivate the minimizd panel at
652     // later time), we need to paint it immediately as inactive so that we can
653     // take a snapshot of inactive panel.
654     if (focused_) {
655       force_to_paint_as_inactive_ = true;
656       ::RedrawWindow(native_window, NULL, NULL,
657                      RDW_NOCHILDREN | RDW_INVALIDATE | RDW_UPDATENOW);
658     }
659
660     // Start the thumbnailer and capture the snapshot now.
661     thumbnailer_->Start();
662     thumbnailer_->CaptureSnapshot();
663   } else {
664     force_to_paint_as_inactive_ = false;
665     thumbnailer_->Stop();
666   }
667
668 #endif
669 }
670
671 gfx::Size PanelView::WindowSizeFromContentSize(
672     const gfx::Size& content_size) const {
673   gfx::Size frame = GetFrameView()->NonClientAreaSize();
674   return gfx::Size(content_size.width() + frame.width(),
675                    content_size.height() + frame.height());
676 }
677
678 gfx::Size PanelView::ContentSizeFromWindowSize(
679     const gfx::Size& window_size) const {
680   gfx::Size frame = GetFrameView()->NonClientAreaSize();
681   return gfx::Size(window_size.width() - frame.width(),
682                    window_size.height() - frame.height());
683 }
684
685 int PanelView::TitleOnlyHeight() const {
686   return panel::kTitlebarHeight;
687 }
688
689 void PanelView::MinimizePanelBySystem() {
690   window_->Minimize();
691 }
692
693 bool PanelView::IsPanelMinimizedBySystem() const {
694   return window_->IsMinimized();
695 }
696
697 bool PanelView::IsPanelShownOnActiveDesktop() const {
698 #if defined(OS_WIN)
699   // Virtual desktop is not supported by the native Windows system.
700   return true;
701 #else
702   NOTIMPLEMENTED();
703   return true;
704 #endif
705 }
706
707 void PanelView::ShowShadow(bool show) {
708 #if defined(OS_WIN)
709   // The overlapped window has the shadow while the popup window does not have
710   // the shadow.
711   int overlap_style = WS_OVERLAPPED | WS_THICKFRAME | WS_SYSMENU;
712   int popup_style = WS_POPUP;
713   UpdateWindowAttribute(GWL_STYLE,
714                         show ? overlap_style : popup_style,
715                         show ? popup_style : overlap_style,
716                         true);
717 #endif
718 }
719
720 void PanelView::AttachWebContents(content::WebContents* contents) {
721   web_view_->SetWebContents(contents);
722 }
723
724 void PanelView::DetachWebContents(content::WebContents* contents) {
725   web_view_->SetWebContents(NULL);
726 }
727
728 NativePanelTesting* PanelView::CreateNativePanelTesting() {
729   return new NativePanelTestingWin(this);
730 }
731
732 void PanelView::OnDisplayChanged() {
733   panel_->manager()->display_settings_provider()->OnDisplaySettingsChanged();
734 }
735
736 void PanelView::OnWorkAreaChanged() {
737   panel_->manager()->display_settings_provider()->OnDisplaySettingsChanged();
738 }
739
740 bool PanelView::WillProcessWorkAreaChange() const {
741   return true;
742 }
743
744 views::View* PanelView::GetContentsView() {
745   return this;
746 }
747
748 views::NonClientFrameView* PanelView::CreateNonClientFrameView(
749     views::Widget* widget) {
750   PanelFrameView* frame_view = new PanelFrameView(this);
751   frame_view->Init();
752   return frame_view;
753 }
754
755 bool PanelView::CanResize() const {
756   return true;
757 }
758
759 bool PanelView::CanMaximize() const {
760   return false;
761 }
762
763 base::string16 PanelView::GetWindowTitle() const {
764   return panel_->GetWindowTitle();
765 }
766
767 gfx::ImageSkia PanelView::GetWindowAppIcon() {
768   gfx::Image app_icon = panel_->app_icon();
769   if (app_icon.IsEmpty())
770     return GetWindowIcon();
771   else
772     return *app_icon.ToImageSkia();
773 }
774
775 gfx::ImageSkia PanelView::GetWindowIcon() {
776   gfx::Image icon = panel_->GetCurrentPageIcon();
777   return icon.IsEmpty() ? gfx::ImageSkia() : *icon.ToImageSkia();
778 }
779
780 void PanelView::WindowClosing() {
781   // When closing a panel via window.close, API or the close button,
782   // ClosePanel() is called first, destroying the native |window_|
783   // which results in this method being called. ClosePanel() sets
784   // |window_closed_| to NULL.
785   // If we still have a |window_closed_| here, the close was triggered by the
786   // OS, (e.g. clicking on taskbar menu), which destroys the native |window_|
787   // without invoking ClosePanel() beforehand.
788   if (!window_closed_) {
789     panel_->OnWindowClosing();
790     ClosePanel();
791     DCHECK(window_closed_);
792   }
793 }
794
795 void PanelView::DeleteDelegate() {
796   delete this;
797 }
798
799 void PanelView::OnWindowBeginUserBoundsChange() {
800   user_resizing_ = true;
801   panel_->OnPanelStartUserResizing();
802
803 #if defined(OS_WIN)
804   StackedPanelCollection* stack = panel_->stack();
805   if (stack) {
806     // Listen to WM_SIZING message in order to find out whether the interior
807     // edge is being resized such that the specific maximum size could be
808     // passed to the system.
809     if (panel_->stack()->GetPanelBelow(panel_.get())) {
810       ui::HWNDSubclass::AddFilterToTarget(views::HWNDForWidget(window_), this);
811       user_resizing_interior_stacked_panel_edge_ = false;
812     }
813
814     // Keep track of the original full size of the resizing panel such that it
815     // can be restored to this size once it is shrunk to minimized state.
816     original_full_size_of_resizing_panel_ = panel_->full_size();
817
818     // Keep track of the original full size of the panel below the resizing
819     // panel such that it can be restored to this size once it is shrunk to
820     // minimized state.
821     Panel* below_panel = stack->GetPanelBelow(panel_.get());
822     if (below_panel && !below_panel->IsMinimized()) {
823       original_full_size_of_panel_below_resizing_panel_ =
824           below_panel->full_size();
825     }
826   }
827 #endif
828 }
829
830 void PanelView::OnWindowEndUserBoundsChange() {
831   user_resizing_ = false;
832   panel_->OnPanelEndUserResizing();
833
834   // No need to proceed with post-resizing update when there is no size change.
835   gfx::Rect new_bounds = window_->GetWindowBoundsInScreen();
836   if (bounds_ == new_bounds)
837     return;
838   bounds_ = new_bounds;
839
840   panel_->IncreaseMaxSize(bounds_.size());
841   panel_->set_full_size(bounds_.size());
842
843 #if defined(OS_WIN)
844   StackedPanelCollection* stack = panel_->stack();
845   if (stack) {
846     // No need to listen to WM_SIZING message any more.
847     ui::HWNDSubclass::RemoveFilterFromAllTargets(this);
848
849     // If the height of resizing panel shrinks close to the titlebar height,
850     // treate it as minimized. This could occur when the user is dragging
851     // 1) the top edge of the top panel downward to shrink it; or
852     // 2) the bottom edge of any panel upward to shrink it.
853     if (panel_->GetBounds().height() <
854             kStackedPanelHeightShrinkThresholdToBecomeMinimized) {
855       stack->MinimizePanel(panel_.get());
856       panel_->set_full_size(original_full_size_of_resizing_panel_);
857     }
858
859     // If the height of panel below the resizing panel shrinks close to the
860     // titlebar height, treat it as minimized. This could occur when the user
861     // is dragging the bottom edge of non-bottom panel downward to expand it
862     // and also shrink the panel below.
863     Panel* below_panel = stack->GetPanelBelow(panel_.get());
864     if (below_panel && !below_panel->IsMinimized() &&
865         below_panel->GetBounds().height() <
866             kStackedPanelHeightShrinkThresholdToBecomeMinimized) {
867       stack->MinimizePanel(below_panel);
868       below_panel->set_full_size(
869           original_full_size_of_panel_below_resizing_panel_);
870     }
871   }
872 #endif
873
874   panel_->collection()->RefreshLayout();
875 }
876
877 views::Widget* PanelView::GetWidget() {
878   return window_;
879 }
880
881 const views::Widget* PanelView::GetWidget() const {
882   return window_;
883 }
884
885 void PanelView::UpdateLoadingAnimations(bool should_animate) {
886   GetFrameView()->UpdateThrobber();
887 }
888
889 void PanelView::UpdateWindowTitle() {
890   window_->UpdateWindowTitle();
891   GetFrameView()->UpdateTitle();
892 }
893
894 void PanelView::UpdateWindowIcon() {
895   window_->UpdateWindowIcon();
896   GetFrameView()->UpdateIcon();
897 }
898
899 void PanelView::Layout() {
900   // |web_view_| might not be created yet when the window is first created.
901   if (web_view_)
902     web_view_->SetBounds(0, 0, width(), height());
903 }
904
905 gfx::Size PanelView::GetMinimumSize() {
906   // If the panel is minimized, it can be rendered to very small size, like
907   // 4-pixel lines when it is docked. Otherwise, its size should not be less
908   // than its minimum size.
909   return panel_->IsMinimized() ? gfx::Size() :
910       gfx::Size(panel::kPanelMinWidth, panel::kPanelMinHeight);
911 }
912
913 gfx::Size PanelView::GetMaximumSize() {
914   // If the user is resizing a stacked panel by its bottom edge, make sure its
915   // height cannot grow more than what the panel below it could offer. This is
916   // because growing a stacked panel by y amount will shrink the panel below it
917   // by same amount and we do not want the panel below it being shrunk to be
918   // smaller than the titlebar.
919 #if defined(OS_WIN)
920   if (panel_->stack() && user_resizing_interior_stacked_panel_edge_) {
921     Panel* below_panel = panel_->stack()->GetPanelBelow(panel_.get());
922     if (below_panel && !below_panel->IsMinimized()) {
923       return gfx::Size(0, below_panel->GetBounds().bottom() -
924           panel_->GetBounds().y() - panel::kTitlebarHeight);
925     }
926   }
927 #endif
928   return gfx::Size();
929 }
930
931 bool PanelView::AcceleratorPressed(const ui::Accelerator& accelerator) {
932   if (mouse_pressed_ && accelerator.key_code() == ui::VKEY_ESCAPE) {
933     OnTitlebarMouseCaptureLost();
934     return true;
935   }
936
937   // No other accelerator is allowed when the drag begins.
938   if (mouse_dragging_state_ == DRAGGING_STARTED)
939     return true;
940
941   const std::map<ui::Accelerator, int>& accelerator_table =
942       GetAcceleratorTable();
943   std::map<ui::Accelerator, int>::const_iterator iter =
944       accelerator_table.find(accelerator);
945   DCHECK(iter != accelerator_table.end());
946   return panel_->ExecuteCommandIfEnabled(iter->second);
947 }
948
949 void PanelView::OnWidgetDestroying(views::Widget* widget) {
950   window_ = NULL;
951 }
952
953 void PanelView::OnWidgetActivationChanged(views::Widget* widget, bool active) {
954 #if defined(OS_WIN)
955   // WM_NCACTIVATED could be sent when an active window is being destroyed on
956   // Windows. We need to guard against this.
957   if (window_closed_)
958     return;
959
960   bool focused = active;
961   if (chrome::GetActiveDesktop() == chrome::HOST_DESKTOP_TYPE_NATIVE) {
962     // The panel window is in focus (actually accepting keystrokes) if it is
963     // active and belongs to a foreground application.
964     focused = active &&
965         views::HWNDForWidget(widget) == ::GetForegroundWindow();
966   }
967 #else
968   NOTIMPLEMENTED();
969   bool focused = active;
970 #endif
971
972   if (focused_ == focused)
973     return;
974   focused_ = focused;
975
976   // Expand the panel if the minimized panel is activated by means other than
977   // clicking on its titlebar. This is the workaround to support restoring the
978   // minimized panel by other means, like alt-tabbing, win-tabbing, or clicking
979   // the taskbar icon. Note that this workaround does not work for one edge
980   // case: the mouse happens to be at the minimized panel when the user tries to
981   // bring up the panel with the above alternatives.
982   // When the user clicks on the minimized panel, the panel expansion will be
983   // done when we process the mouse button pressed message.
984 #if defined(OS_WIN)
985   if (focused_ && panel_->IsMinimized() &&
986       panel_->collection()->type() == PanelCollection::DOCKED &&
987       gfx::Screen::GetScreenFor(widget->GetNativeWindow())->
988           GetWindowUnderCursor() != widget->GetNativeWindow()) {
989     panel_->Restore();
990   }
991 #endif
992
993   panel()->OnActiveStateChanged(focused);
994
995    // Give web contents view a chance to set focus to the appropriate element.
996   if (focused_) {
997     content::WebContents* web_contents = panel_->GetWebContents();
998     if (web_contents)
999       web_contents->RestoreFocus();
1000   }
1001 }
1002
1003 void PanelView::OnWidgetBoundsChanged(views::Widget* widget,
1004                                       const gfx::Rect& new_bounds) {
1005   if (user_resizing_)
1006     panel()->collection()->OnPanelResizedByMouse(panel(), new_bounds);
1007 }
1008
1009 bool PanelView::OnTitlebarMousePressed(const gfx::Point& mouse_location) {
1010   mouse_pressed_ = true;
1011   mouse_dragging_state_ = NO_DRAGGING;
1012   last_mouse_location_ = mouse_location;
1013   return true;
1014 }
1015
1016 bool PanelView::OnTitlebarMouseDragged(const gfx::Point& mouse_location) {
1017   if (!mouse_pressed_)
1018     return false;
1019
1020   if (mouse_dragging_state_ == NO_DRAGGING &&
1021       ExceededDragThreshold(mouse_location - last_mouse_location_)) {
1022     // When a drag begins, we do not want to the client area to still receive
1023     // the focus. We do not need to do this for the unfocused minimized panel.
1024     if (!panel_->IsMinimized()) {
1025       old_focused_view_ = GetFocusManager()->GetFocusedView();
1026       GetFocusManager()->SetFocusedView(GetFrameView());
1027     }
1028
1029     panel_->manager()->StartDragging(panel_.get(), last_mouse_location_);
1030     mouse_dragging_state_ = DRAGGING_STARTED;
1031   }
1032   if (mouse_dragging_state_ == DRAGGING_STARTED) {
1033     panel_->manager()->Drag(mouse_location);
1034
1035     // Once in drag, update |last_mouse_location_| on each drag fragment, since
1036     // we already dragged the panel up to the current mouse location.
1037     last_mouse_location_ = mouse_location;
1038   }
1039   return true;
1040 }
1041
1042 bool PanelView::OnTitlebarMouseReleased(panel::ClickModifier modifier) {
1043   if (mouse_dragging_state_ != NO_DRAGGING) {
1044     // Ensure dragging a minimized panel does not leave it activated.
1045     // Windows activates a panel on mouse-down, regardless of our attempts
1046     // to prevent activation of a minimized panel. Now that we know mouse-down
1047     // resulted in a mouse-drag, we need to ensure the minimized panel is
1048     // deactivated.
1049     if (panel_->IsMinimized() && focused_)
1050       panel_->Deactivate();
1051
1052     if (mouse_dragging_state_ == DRAGGING_STARTED) {
1053       // When a drag ends, restore the focus.
1054       if (old_focused_view_) {
1055         GetFocusManager()->SetFocusedView(old_focused_view_);
1056         old_focused_view_ = NULL;
1057       }
1058       return EndDragging(false);
1059     }
1060
1061     // The panel drag was cancelled before the mouse is released. Do not
1062     // treat this as a click.
1063     return true;
1064   }
1065
1066   panel_->OnTitlebarClicked(modifier);
1067   return true;
1068 }
1069
1070 bool PanelView::OnTitlebarMouseCaptureLost() {
1071   if (mouse_dragging_state_ == DRAGGING_STARTED)
1072     return EndDragging(true);
1073   return true;
1074 }
1075
1076 bool PanelView::EndDragging(bool cancelled) {
1077   // Only handle clicks that started in our window.
1078   if (!mouse_pressed_)
1079     return false;
1080   mouse_pressed_ = false;
1081
1082   mouse_dragging_state_ = DRAGGING_ENDED;
1083   panel_->manager()->EndDragging(cancelled);
1084   return true;
1085 }
1086
1087 PanelFrameView* PanelView::GetFrameView() const {
1088   return static_cast<PanelFrameView*>(window_->non_client_view()->frame_view());
1089 }
1090
1091 bool PanelView::IsAnimatingBounds() const {
1092   if (bounds_animator_.get() && bounds_animator_->is_animating())
1093     return true;
1094   StackedPanelCollection* stack = panel_->stack();
1095   if (!stack)
1096     return false;
1097   return stack->IsAnimatingPanelBounds(panel_.get());
1098 }
1099
1100 bool PanelView::IsWithinResizingArea(const gfx::Point& mouse_location) const {
1101   gfx::Rect bounds = window_->GetWindowBoundsInScreen();
1102   DCHECK(bounds.Contains(mouse_location));
1103   return mouse_location.x() < bounds.x() + kResizeInsideBoundsSize ||
1104          mouse_location.x() >= bounds.right() - kResizeInsideBoundsSize ||
1105          mouse_location.y() < bounds.y() + kResizeInsideBoundsSize ||
1106          mouse_location.y() >= bounds.bottom() - kResizeInsideBoundsSize;
1107 }
1108
1109 #if defined(OS_WIN)
1110 void PanelView::UpdateWindowAttribute(int attribute_index,
1111                                       int attribute_value_to_set,
1112                                       int attribute_value_to_reset,
1113                                       bool update_frame) {
1114   HWND native_window = views::HWNDForWidget(window_);
1115   int value = ::GetWindowLong(native_window, attribute_index);
1116   int expected_value = value;
1117   if (attribute_value_to_set)
1118     expected_value |=  attribute_value_to_set;
1119   if (attribute_value_to_reset)
1120     expected_value &=  ~attribute_value_to_reset;
1121   if (value != expected_value)
1122     ::SetWindowLong(native_window, attribute_index, expected_value);
1123
1124   // Per MSDN, if any of the frame styles is changed, SetWindowPos with the
1125   // SWP_FRAMECHANGED flag must be called in order for the cached window data
1126   // to be updated properly.
1127   // http://msdn.microsoft.com/en-us/library/windows/desktop/ms633591(v=vs.85).aspx
1128   if (update_frame) {
1129     ::SetWindowPos(native_window, NULL, 0, 0, 0, 0,
1130                    SWP_FRAMECHANGED | SWP_NOMOVE | SWP_NOSIZE |
1131                        SWP_NOZORDER | SWP_NOACTIVATE);
1132   }
1133 }
1134 #endif