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/content_accelerators/accelerator_util.h"
  24 #include "ui/gfx/image/image.h"
  25 #include "ui/gfx/path.h"
  26 #include "ui/gfx/screen.h"
  27 #include "ui/views/controls/button/image_button.h"
  28 #include "ui/views/controls/webview/webview.h"
  29 #include "ui/views/widget/widget.h"
  30
  31 #if defined(OS_WIN)
  32 #include "base/win/windows_version.h"
  33 #include "chrome/browser/shell_integration.h"
  34 #include "chrome/browser/ui/views/panels/taskbar_window_thumbnailer_win.h"
  35 #include "ui/base/win/shell.h"
  36 #include "ui/gfx/icon_util.h"
  37 #include "ui/views/win/hwnd_util.h"
  38 #endif
  39
  40 #if defined(USE_X11) && !defined(OS_CHROMEOS)
  41 #include "chrome/browser/shell_integration_linux.h"
  42 #include "chrome/browser/ui/views/panels/x11_panel_resizer.h"
  43 #include "chrome/browser/web_applications/web_app.h"
  44 #include "ui/aura/window.h"
  45 #include "ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h"
  46 #endif
  47
  48 namespace {
  49
  50 #if defined(OS_WIN)
  51 // If the height of a stacked panel shrinks below this threshold during the
  52 // user resizing, it will be treated as minimized.
  53 const int kStackedPanelHeightShrinkThresholdToBecomeMinimized =
  54     panel::kTitlebarHeight + 20;
  55 #endif
  56
  57 // Supported accelerators.
  58 // Note: We can't use the accelerator table defined in chrome/browser/ui/views
  59 // due to checkdeps violation.
  60 struct AcceleratorMapping {
  61   ui::KeyboardCode keycode;
  62   int modifiers;
  63   int command_id;
  64 };
  65 const AcceleratorMapping kPanelAcceleratorMap[] = {
  66   { ui::VKEY_W, ui::EF_CONTROL_DOWN, IDC_CLOSE_WINDOW },
  67   { ui::VKEY_W, ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN, IDC_CLOSE_WINDOW },
  68   { ui::VKEY_F4, ui::EF_ALT_DOWN, IDC_CLOSE_WINDOW },
  69   { ui::VKEY_R, ui::EF_CONTROL_DOWN, IDC_RELOAD },
  70   { ui::VKEY_F5, ui::EF_NONE, IDC_RELOAD },
  71   { ui::VKEY_R, ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN,
  72       IDC_RELOAD_IGNORING_CACHE },
  73   { ui::VKEY_F5, ui::EF_CONTROL_DOWN, IDC_RELOAD_IGNORING_CACHE },
  74   { ui::VKEY_F5, ui::EF_SHIFT_DOWN, IDC_RELOAD_IGNORING_CACHE },
  75   { ui::VKEY_ESCAPE, ui::EF_NONE, IDC_STOP },
  76   { ui::VKEY_OEM_MINUS, ui::EF_CONTROL_DOWN, IDC_ZOOM_MINUS },
  77   { ui::VKEY_SUBTRACT, ui::EF_CONTROL_DOWN, IDC_ZOOM_MINUS },
  78   { ui::VKEY_0, ui::EF_CONTROL_DOWN, IDC_ZOOM_NORMAL },
  79   { ui::VKEY_NUMPAD0, ui::EF_CONTROL_DOWN, IDC_ZOOM_NORMAL },
  80   { ui::VKEY_OEM_PLUS, ui::EF_CONTROL_DOWN, IDC_ZOOM_PLUS },
  81   { ui::VKEY_ADD, ui::EF_CONTROL_DOWN, IDC_ZOOM_PLUS },
  82   { ui::VKEY_I, ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN, IDC_DEV_TOOLS },
  83   { ui::VKEY_J, ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN,
  84     IDC_DEV_TOOLS_CONSOLE },
  85 };
  86
  87 const std::map<ui::Accelerator, int>& GetAcceleratorTable() {
  88   static std::map<ui::Accelerator, int>* accelerators = NULL;
  89   if (!accelerators) {
  90     accelerators = new std::map<ui::Accelerator, int>();
  91     for (size_t i = 0; i < arraysize(kPanelAcceleratorMap); ++i) {
  92       ui::Accelerator accelerator(kPanelAcceleratorMap[i].keycode,
  93                                   kPanelAcceleratorMap[i].modifiers);
  94       (*accelerators)[accelerator] = kPanelAcceleratorMap[i].command_id;
  95     }
  96   }
  97   return *accelerators;
  98 }
  99
 100 // NativePanelTesting implementation.
 101 class NativePanelTestingViews : public NativePanelTesting {
 102  public:
 103   explicit NativePanelTestingViews(PanelView* panel_view);
 104   ~NativePanelTestingViews() override;
 105
 106  private:
 107   void PressLeftMouseButtonTitlebar(const gfx::Point& mouse_location,
 108                                     panel::ClickModifier modifier) override;
 109   void ReleaseMouseButtonTitlebar(panel::ClickModifier modifier) override;
 110   void DragTitlebar(const gfx::Point& mouse_location) override;
 111   void CancelDragTitlebar() override;
 112   void FinishDragTitlebar() override;
 113   bool VerifyDrawingAttention() const override;
 114   bool VerifyActiveState(bool is_active) override;
 115   bool VerifyAppIcon() const override;
 116   bool VerifySystemMinimizeState() const override;
 117   bool IsWindowVisible() const override;
 118   bool IsWindowSizeKnown() const override;
 119   bool IsAnimatingBounds() const override;
 120   bool IsButtonVisible(panel::TitlebarButtonType button_type) const override;
 121   panel::CornerStyle GetWindowCornerStyle() const override;
 122   bool EnsureApplicationRunOnForeground() override;
 123
 124   PanelView* panel_view_;
 125 };
 126
 127 NativePanelTestingViews::NativePanelTestingViews(PanelView* panel_view)
 128     : panel_view_(panel_view) {
 129 }
 130
 131 NativePanelTestingViews::~NativePanelTestingViews() {
 132 }
 133
 134 void NativePanelTestingViews::PressLeftMouseButtonTitlebar(
 135     const gfx::Point& mouse_location, panel::ClickModifier modifier) {
 136   panel_view_->OnTitlebarMousePressed(mouse_location);
 137 }
 138
 139 void NativePanelTestingViews::ReleaseMouseButtonTitlebar(
 140     panel::ClickModifier modifier) {
 141   panel_view_->OnTitlebarMouseReleased(modifier);
 142 }
 143
 144 void NativePanelTestingViews::DragTitlebar(const gfx::Point& mouse_location) {
 145   panel_view_->OnTitlebarMouseDragged(mouse_location);
 146 }
 147
 148 void NativePanelTestingViews::CancelDragTitlebar() {
 149   panel_view_->OnTitlebarMouseCaptureLost();
 150 }
 151
 152 void NativePanelTestingViews::FinishDragTitlebar() {
 153   panel_view_->OnTitlebarMouseReleased(panel::NO_MODIFIER);
 154 }
 155
 156 bool NativePanelTestingViews::VerifyDrawingAttention() const {
 157   base::MessageLoop::current()->RunUntilIdle();
 158   return panel_view_->GetFrameView()->GetPaintState() ==
 159          PanelFrameView::PAINT_FOR_ATTENTION;
 160 }
 161
 162 bool NativePanelTestingViews::VerifyActiveState(bool is_active) {
 163   return panel_view_->GetFrameView()->GetPaintState() ==
 164          (is_active ? PanelFrameView::PAINT_AS_ACTIVE
 165                     : PanelFrameView::PAINT_AS_INACTIVE);
 166 }
 167
 168 bool NativePanelTestingViews::VerifyAppIcon() const {
 169 #if defined(OS_WIN)
 170   // We only care about Windows 7 and later.
 171   if (base::win::GetVersion() < base::win::VERSION_WIN7)
 172     return true;
 173
 174   HWND native_window = views::HWNDForWidget(panel_view_->window());
 175   HICON app_icon = reinterpret_cast<HICON>(
 176       ::SendMessage(native_window, WM_GETICON, ICON_BIG, 0L));
 177   if (!app_icon)
 178     return false;
 179   scoped_ptr<SkBitmap> bitmap(IconUtil::CreateSkBitmapFromHICON(app_icon));
 180   return bitmap.get() &&
 181          bitmap->width() == panel::kPanelAppIconSize &&
 182          bitmap->height() == panel::kPanelAppIconSize;
 183 #else
 184   return true;
 185 #endif
 186 }
 187
 188 bool NativePanelTestingViews::VerifySystemMinimizeState() const {
 189 #if defined(OS_WIN)
 190   HWND native_window = views::HWNDForWidget(panel_view_->window());
 191   WINDOWPLACEMENT placement;
 192   if (!::GetWindowPlacement(native_window, &placement))
 193     return false;
 194   if (placement.showCmd == SW_MINIMIZE || placement.showCmd == SW_SHOWMINIMIZED)
 195     return true;
 196
 197   // If the panel window has owner window, as in stacked mode, check its owner
 198   // window. Note that owner window, instead of parent window, is returned
 199   // though GWL_HWNDPARENT contains 'parent'.
 200   HWND owner_window =
 201       reinterpret_cast<HWND>(::GetWindowLongPtr(native_window,
 202                                                 GWLP_HWNDPARENT));
 203   if (!owner_window || !::GetWindowPlacement(owner_window, &placement))
 204     return false;
 205   return placement.showCmd == SW_MINIMIZE ||
 206          placement.showCmd == SW_SHOWMINIMIZED;
 207 #else
 208   return true;
 209 #endif
 210 }
 211
 212 bool NativePanelTestingViews::IsWindowVisible() const {
 213   return panel_view_->window()->IsVisible();
 214 }
 215
 216 bool NativePanelTestingViews::IsWindowSizeKnown() const {
 217   return true;
 218 }
 219
 220 bool NativePanelTestingViews::IsAnimatingBounds() const {
 221   return panel_view_->IsAnimatingBounds();
 222 }
 223
 224 bool NativePanelTestingViews::IsButtonVisible(
 225     panel::TitlebarButtonType button_type) const {
 226   PanelFrameView* frame_view = panel_view_->GetFrameView();
 227
 228   switch (button_type) {
 229     case panel::CLOSE_BUTTON:
 230       return frame_view->close_button()->visible();
 231     case panel::MINIMIZE_BUTTON:
 232       return frame_view->minimize_button()->visible();
 233     case panel::RESTORE_BUTTON:
 234       return frame_view->restore_button()->visible();
 235     default:
 236       NOTREACHED();
 237   }
 238   return false;
 239 }
 240
 241 panel::CornerStyle NativePanelTestingViews::GetWindowCornerStyle() const {
 242   return panel_view_->GetFrameView()->corner_style();
 243 }
 244
 245 bool NativePanelTestingViews::EnsureApplicationRunOnForeground() {
 246   // Not needed on views.
 247   return true;
 248 }
 249
 250 }  // namespace
 251
 252 // static
 253 NativePanel* Panel::CreateNativePanel(Panel* panel,
 254                                       const gfx::Rect& bounds,
 255                                       bool always_on_top) {
 256   return new PanelView(panel, bounds, always_on_top);
 257 }
 258
 259 // The panel window has to be created as always-on-top. We cannot create it
 260 // as non-always-on-top and then change it to always-on-top because Windows
 261 // system might deny making a window always-on-top if the application is not
 262 // a foreground application.
 263 PanelView::PanelView(Panel* panel, const gfx::Rect& bounds, bool always_on_top)
 264     : panel_(panel),
 265       bounds_(bounds),
 266       window_(NULL),
 267       window_closed_(false),
 268       web_view_(NULL),
 269       always_on_top_(always_on_top),
 270       focused_(false),
 271       user_resizing_(false),
 272 #if defined(OS_WIN)
 273       user_resizing_interior_stacked_panel_edge_(false),
 274 #endif
 275       mouse_pressed_(false),
 276       mouse_dragging_state_(NO_DRAGGING),
 277       is_drawing_attention_(false),
 278       force_to_paint_as_inactive_(false),
 279       old_focused_view_(NULL) {
 280   window_ = new views::Widget;
 281   views::Widget::InitParams params(views::Widget::InitParams::TYPE_WINDOW);
 282   params.delegate = this;
 283   params.remove_standard_frame = true;
 284   params.keep_on_top = always_on_top;
 285   params.visible_on_all_workspaces = always_on_top;
 286   params.bounds = bounds;
 287
 288 #if defined(USE_X11) && !defined(OS_CHROMEOS)
 289   params.wm_class_name = web_app::GetWMClassFromAppName(panel->app_name());
 290   params.wm_class_class = shell_integration_linux::GetProgramClassName();
 291 #endif
 292
 293   window_->Init(params);
 294   window_->set_frame_type(views::Widget::FRAME_TYPE_FORCE_CUSTOM);
 295   window_->set_focus_on_creation(false);
 296   window_->AddObserver(this);
 297
 298   // Prevent the browser process from shutting down while this window is open.
 299   keep_alive_.reset(new AutoKeepAlive(GetNativePanelWindow()));
 300
 301   web_view_ = new views::WebView(NULL);
 302   AddChildView(web_view_);
 303
 304   // Register accelarators supported by panels.
 305   views::FocusManager* focus_manager = GetFocusManager();
 306   const std::map<ui::Accelerator, int>& accelerator_table =
 307       GetAcceleratorTable();
 308   for (std::map<ui::Accelerator, int>::const_iterator iter =
 309            accelerator_table.begin();
 310        iter != accelerator_table.end(); ++iter) {
 311     focus_manager->RegisterAccelerator(
 312         iter->first, ui::AcceleratorManager::kNormalPriority, this);
 313   }
 314
 315 #if defined(OS_WIN)
 316   ui::win::SetAppIdForWindow(
 317       ShellIntegration::GetAppModelIdForProfile(
 318           base::UTF8ToWide(panel->app_name()), panel->profile()->GetPath()),
 319       views::HWNDForWidget(window_));
 320   ui::win::PreventWindowFromPinning(views::HWNDForWidget(window_));
 321 #endif
 322
 323 #if defined(USE_X11) && !defined(OS_CHROMEOS)
 324   // Swap the default non client event handler with one which handles resizes
 325   // for panels entirely within Chrome. This is needed because it is not
 326   // possible to tell when a resize performed by the window manager ends.
 327   views::DesktopWindowTreeHostX11* host =
 328       views::DesktopWindowTreeHostX11::GetHostForXID(
 329           window_->GetNativeView()->GetHost()->GetAcceleratedWidget());
 330   scoped_ptr<ui::EventHandler> resizer(
 331       new X11PanelResizer(panel_.get(), window_->GetNativeWindow()));
 332   host->SwapNonClientEventHandler(resizer.Pass());
 333 #endif
 334 }
 335
 336 PanelView::~PanelView() {
 337 }
 338
 339 void PanelView::ShowPanel() {
 340   if (window_->IsVisible())
 341     return;
 342   window_->Show();
 343   panel_->manager()->OnPanelAnimationEnded(panel_.get());
 344 }
 345
 346 void PanelView::ShowPanelInactive() {
 347   if (window_->IsVisible())
 348     return;
 349   window_->ShowInactive();
 350   // No animation is used for initial creation of a panel on Win.
 351   // Signal immediately that pending actions can be performed.
 352   panel_->manager()->OnPanelAnimationEnded(panel_.get());
 353 }
 354
 355 gfx::Rect PanelView::GetPanelBounds() const {
 356   return bounds_;
 357 }
 358
 359 void PanelView::SetPanelBounds(const gfx::Rect& bounds) {
 360   SetBoundsInternal(bounds, true);
 361 }
 362
 363 void PanelView::SetPanelBoundsInstantly(const gfx::Rect& bounds) {
 364   SetBoundsInternal(bounds, false);
 365 }
 366
 367 void PanelView::SetBoundsInternal(const gfx::Rect& new_bounds, bool animate) {
 368   if (bounds_ == new_bounds)
 369     return;
 370
 371   bounds_ = new_bounds;
 372
 373   if (!animate) {
 374     // If no animation is in progress, apply bounds change instantly. Otherwise,
 375     // continue the animation with new target bounds.
 376     if (!IsAnimatingBounds())
 377       SetWidgetBounds(bounds_);
 378     return;
 379   }
 380
 381   animation_start_bounds_ = window_->GetWindowBoundsInScreen();
 382
 383   bounds_animator_.reset(new PanelBoundsAnimation(
 384       this, panel_.get(), animation_start_bounds_, new_bounds));
 385   bounds_animator_->Start();
 386 }
 387
 388 #if defined(OS_WIN)
 389 bool PanelView::FilterMessage(HWND hwnd,
 390                               UINT message,
 391                               WPARAM w_param,
 392                               LPARAM l_param,
 393                               LRESULT* l_result) {
 394   switch (message) {
 395     case WM_SIZING:
 396       if (w_param == WMSZ_BOTTOM)
 397         user_resizing_interior_stacked_panel_edge_ = true;
 398       break;
 399   }
 400   return false;
 401 }
 402 #endif
 403
 404 void PanelView::AnimationEnded(const gfx::Animation* animation) {
 405   panel_->manager()->OnPanelAnimationEnded(panel_.get());
 406 }
 407
 408 void PanelView::AnimationProgressed(const gfx::Animation* animation) {
 409   gfx::Rect new_bounds = bounds_animator_->CurrentValueBetween(
 410       animation_start_bounds_, bounds_);
 411   SetWidgetBounds(new_bounds);
 412 }
 413
 414 void PanelView::SetWidgetBounds(const gfx::Rect& new_bounds) {
 415 #if defined(OS_WIN)
 416   // An overlapped window is a top-level window that has a titlebar, border,
 417   // and client area. The Windows system will automatically put the shadow
 418   // around the whole window. Also the system will enforce the minimum height
 419   // (38 pixels based on observation) for the overlapped window such that it
 420   // will always has the space for the titlebar.
 421   //
 422   // On contrast, a popup window is a bare minimum window without border and
 423   // titlebar by default. It is often used for the popup menu and the window
 424   // with short life. The Windows system does not add the shadow around the
 425   // whole window though CS_DROPSHADOW class style could be passed to add the
 426   // drop shadow which is only around the right and bottom edges.
 427   //
 428   // The height of the title-only or minimized panel is smaller than the minimum
 429   // overlapped window height. If the panel still uses the overlapped window
 430   // style, Windows system will automatically increase the window height. To
 431   // work around this limitation, we temporarily change the window style to
 432   // popup when the height to set is smaller than the minimum overlapped window
 433   // height and then restore the window style to overlapped when the height
 434   // grows.
 435   static const int kMinimumOverlappedWindowHeight = 38;
 436   gfx::Rect old_bounds = GetWidget()->GetRestoredBounds();
 437   if (old_bounds.height() > kMinimumOverlappedWindowHeight &&
 438       new_bounds.height() <= kMinimumOverlappedWindowHeight) {
 439     // When the panel height shrinks below the minimum overlapped window height,
 440     // change the window style to popup such that we can show the title-only
 441     // and minimized panel without additional height being added by the system.
 442     UpdateWindowAttribute(GWL_STYLE,
 443                           WS_POPUP,
 444                           WS_OVERLAPPED | WS_THICKFRAME | WS_SYSMENU,
 445                           true);
 446   } else if (old_bounds.height() <= kMinimumOverlappedWindowHeight &&
 447              new_bounds.height() > kMinimumOverlappedWindowHeight) {
 448     // Change the window style back to overlappped when the panel height grow
 449     // taller than the minimum overlapped window height.
 450     UpdateWindowAttribute(GWL_STYLE,
 451                           WS_OVERLAPPED | WS_THICKFRAME | WS_SYSMENU,
 452                           WS_POPUP,
 453                           true);
 454   }
 455 #endif
 456
 457   GetWidget()->SetBounds(new_bounds);
 458 }
 459
 460 void PanelView::ClosePanel() {
 461   // We're already closing. Do nothing.
 462   if (window_closed_)
 463     return;
 464
 465   if (!panel_->ShouldCloseWindow())
 466     return;
 467
 468   // Cancel any currently running animation since we're closing down.
 469   if (bounds_animator_.get())
 470     bounds_animator_.reset();
 471
 472   if (panel_->GetWebContents()) {
 473     // Still have web contents. Allow renderer to shut down.
 474     // When web contents are destroyed, we will be called back again.
 475     panel_->OnWindowClosing();
 476     return;
 477   }
 478
 479   panel_->OnNativePanelClosed();
 480   if (window_)
 481     window_->Close();
 482   window_closed_ = true;
 483 }
 484
 485 void PanelView::ActivatePanel() {
 486   window_->Activate();
 487 }
 488
 489 void PanelView::DeactivatePanel() {
 490   if (!focused_)
 491     return;
 492
 493 #if defined(OS_WIN)
 494   // Need custom behavior for always-on-top panels to avoid
 495   // the OS activating a minimized panel when this one is
 496   // deactivated.
 497   if (always_on_top_) {
 498     ::SetForegroundWindow(::GetDesktopWindow());
 499     return;
 500   }
 501 #endif
 502
 503   window_->Deactivate();
 504 }
 505
 506 bool PanelView::IsPanelActive() const {
 507   return focused_;
 508 }
 509
 510 void PanelView::PreventActivationByOS(bool prevent_activation) {
 511 #if defined(OS_WIN)
 512   // Set the flags "NoActivate" to make sure the minimized panels do not get
 513   // activated by the OS. In addition, set "AppWindow" to make sure the
 514   // minimized panels do appear in the taskbar and Alt-Tab menu if it is not
 515   // in a stack.
 516   int value_to_change = WS_EX_NOACTIVATE;
 517   if (!panel_->stack())
 518     value_to_change |= WS_EX_APPWINDOW;
 519   if (prevent_activation)
 520     UpdateWindowAttribute(GWL_EXSTYLE, value_to_change, 0, false);
 521   else
 522     UpdateWindowAttribute(GWL_EXSTYLE, 0, value_to_change, false);
 523 #endif
 524 }
 525
 526 gfx::NativeWindow PanelView::GetNativePanelWindow() {
 527   return window_->GetNativeWindow();
 528 }
 529
 530 void PanelView::UpdatePanelTitleBar() {
 531   UpdateWindowTitle();
 532   UpdateWindowIcon();
 533 }
 534
 535 void PanelView::UpdatePanelLoadingAnimations(bool should_animate) {
 536   GetFrameView()->UpdateThrobber();
 537 }
 538
 539 void PanelView::PanelWebContentsFocused(content::WebContents* contents) {
 540   web_view_->OnWebContentsFocused(contents);
 541 }
 542
 543 void PanelView::PanelCut() {
 544   // Nothing to do since we do not have panel-specific system menu.
 545   NOTREACHED();
 546 }
 547
 548 void PanelView::PanelCopy() {
 549   // Nothing to do since we do not have panel-specific system menu.
 550   NOTREACHED();
 551 }
 552
 553 void PanelView::PanelPaste() {
 554   // Nothing to do since we do not have panel-specific system menu.
 555   NOTREACHED();
 556 }
 557
 558 void PanelView::DrawAttention(bool draw_attention) {
 559   DCHECK((panel_->attention_mode() & Panel::USE_PANEL_ATTENTION) != 0);
 560
 561   if (is_drawing_attention_ == draw_attention)
 562     return;
 563   is_drawing_attention_ = draw_attention;
 564   GetFrameView()->SchedulePaint();
 565
 566   if ((panel_->attention_mode() & Panel::USE_SYSTEM_ATTENTION) != 0) {
 567 #if defined(OS_WIN)
 568     // The default implementation of Widget::FlashFrame only flashes 5 times.
 569     // We need more than that.
 570     FLASHWINFO fwi;
 571     fwi.cbSize = sizeof(fwi);
 572     fwi.hwnd = views::HWNDForWidget(window_);
 573     if (draw_attention) {
 574       fwi.dwFlags = FLASHW_ALL;
 575       fwi.uCount = panel::kNumberOfTimesToFlashPanelForAttention;
 576       fwi.dwTimeout = 0;
 577     } else {
 578       // TODO(jianli): calling FlashWindowEx with FLASHW_STOP flag for the
 579       // panel window has the same problem as the stack window. However,
 580       // we cannot take the similar fix since there is no background window
 581       // to replace for the regular panel window. More investigation is needed.
 582       fwi.dwFlags = FLASHW_STOP;
 583     }
 584     ::FlashWindowEx(&fwi);
 585 #else
 586     window_->FlashFrame(draw_attention);
 587 #endif
 588   }
 589 }
 590
 591 bool PanelView::IsDrawingAttention() const {
 592   return is_drawing_attention_;
 593 }
 594
 595 void PanelView::HandlePanelKeyboardEvent(
 596     const content::NativeWebKeyboardEvent& event) {
 597   views::FocusManager* focus_manager = GetFocusManager();
 598   if (focus_manager->shortcut_handling_suspended())
 599     return;
 600
 601   ui::Accelerator accelerator =
 602       ui::GetAcceleratorFromNativeWebKeyboardEvent(event);
 603   focus_manager->ProcessAccelerator(accelerator);
 604 }
 605
 606 void PanelView::FullScreenModeChanged(bool is_full_screen) {
 607   if (is_full_screen) {
 608     if (window_->IsVisible() && always_on_top_)
 609       window_->Hide();
 610   } else {
 611     if (!window_->IsVisible()) {
 612       ShowPanelInactive();
 613
 614 #if defined(OS_WIN)
 615       // When hiding and showing again a top-most window that belongs to a
 616       // background application (i.e. the application is not a foreground one),
 617       // the window may loose top-most placement even though its WS_EX_TOPMOST
 618       // bit is still set. Re-issuing SetWindowsPos() returns the window to its
 619       // top-most placement.
 620       if (always_on_top_)
 621         window_->SetAlwaysOnTop(true);
 622 #endif
 623     }
 624   }
 625 }
 626
 627 bool PanelView::IsPanelAlwaysOnTop() const {
 628   return always_on_top_;
 629 }
 630
 631 void PanelView::SetPanelAlwaysOnTop(bool on_top) {
 632   if (always_on_top_ == on_top)
 633     return;
 634   always_on_top_ = on_top;
 635
 636   window_->SetAlwaysOnTop(on_top);
 637   window_->SetVisibleOnAllWorkspaces(on_top);
 638   window_->non_client_view()->Layout();
 639   window_->client_view()->Layout();
 640 }
 641
 642 void PanelView::UpdatePanelMinimizeRestoreButtonVisibility() {
 643   GetFrameView()->UpdateTitlebarMinimizeRestoreButtonVisibility();
 644 }
 645
 646 void PanelView::SetWindowCornerStyle(panel::CornerStyle corner_style) {
 647   GetFrameView()->SetWindowCornerStyle(corner_style);
 648 }
 649
 650 void PanelView::PanelExpansionStateChanging(Panel::ExpansionState old_state,
 651                                             Panel::ExpansionState new_state) {
 652 #if defined(OS_WIN)
 653   // Live preview is only available since Windows 7.
 654   if (base::win::GetVersion() < base::win::VERSION_WIN7)
 655     return;
 656
 657   if (panel_->collection()->type() != PanelCollection::DOCKED)
 658     return;
 659
 660   bool is_minimized = old_state != Panel::EXPANDED;
 661   bool will_be_minimized = new_state != Panel::EXPANDED;
 662   if (is_minimized == will_be_minimized)
 663     return;
 664
 665   HWND native_window = views::HWNDForWidget(window_);
 666
 667   if (!thumbnailer_.get()) {
 668     DCHECK(native_window);
 669     thumbnailer_.reset(new TaskbarWindowThumbnailerWin(native_window, NULL));
 670   }
 671
 672   // Cache the image at this point.
 673   if (will_be_minimized) {
 674     // If the panel is still active (we will deactivate the minimizd panel at
 675     // later time), we need to paint it immediately as inactive so that we can
 676     // take a snapshot of inactive panel.
 677     if (focused_) {
 678       force_to_paint_as_inactive_ = true;
 679       ::RedrawWindow(native_window, NULL, NULL,
 680                      RDW_NOCHILDREN | RDW_INVALIDATE | RDW_UPDATENOW);
 681     }
 682
 683     // Start the thumbnailer and capture the snapshot now.
 684     thumbnailer_->Start();
 685     thumbnailer_->CaptureSnapshot();
 686   } else {
 687     force_to_paint_as_inactive_ = false;
 688     thumbnailer_->Stop();
 689   }
 690
 691 #endif
 692 }
 693
 694 gfx::Size PanelView::WindowSizeFromContentSize(
 695     const gfx::Size& content_size) const {
 696   gfx::Size frame = GetFrameView()->NonClientAreaSize();
 697   return gfx::Size(content_size.width() + frame.width(),
 698                    content_size.height() + frame.height());
 699 }
 700
 701 gfx::Size PanelView::ContentSizeFromWindowSize(
 702     const gfx::Size& window_size) const {
 703   gfx::Size frame = GetFrameView()->NonClientAreaSize();
 704   return gfx::Size(window_size.width() - frame.width(),
 705                    window_size.height() - frame.height());
 706 }
 707
 708 int PanelView::TitleOnlyHeight() const {
 709   return panel::kTitlebarHeight;
 710 }
 711
 712 void PanelView::MinimizePanelBySystem() {
 713   window_->Minimize();
 714 }
 715
 716 bool PanelView::IsPanelMinimizedBySystem() const {
 717   return window_->IsMinimized();
 718 }
 719
 720 bool PanelView::IsPanelShownOnActiveDesktop() const {
 721 #if defined(OS_WIN)
 722   // Virtual desktop is not supported by the native Windows system.
 723   return true;
 724 #else
 725   NOTIMPLEMENTED();
 726   return true;
 727 #endif
 728 }
 729
 730 void PanelView::ShowShadow(bool show) {
 731 #if defined(OS_WIN)
 732   // The overlapped window has the shadow while the popup window does not have
 733   // the shadow.
 734   int overlap_style = WS_OVERLAPPED | WS_THICKFRAME | WS_SYSMENU;
 735   int popup_style = WS_POPUP;
 736   UpdateWindowAttribute(GWL_STYLE,
 737                         show ? overlap_style : popup_style,
 738                         show ? popup_style : overlap_style,
 739                         true);
 740 #endif
 741 }
 742
 743 void PanelView::AttachWebContents(content::WebContents* contents) {
 744   web_view_->SetWebContents(contents);
 745 }
 746
 747 void PanelView::DetachWebContents(content::WebContents* contents) {
 748   web_view_->SetWebContents(NULL);
 749 }
 750
 751 NativePanelTesting* PanelView::CreateNativePanelTesting() {
 752   return new NativePanelTestingViews(this);
 753 }
 754
 755 void PanelView::OnDisplayChanged() {
 756   panel_->manager()->display_settings_provider()->OnDisplaySettingsChanged();
 757 }
 758
 759 void PanelView::OnWorkAreaChanged() {
 760   panel_->manager()->display_settings_provider()->OnDisplaySettingsChanged();
 761 }
 762
 763 bool PanelView::WillProcessWorkAreaChange() const {
 764   return true;
 765 }
 766
 767 views::View* PanelView::GetContentsView() {
 768   return this;
 769 }
 770
 771 views::NonClientFrameView* PanelView::CreateNonClientFrameView(
 772     views::Widget* widget) {
 773   PanelFrameView* frame_view = new PanelFrameView(this);
 774   frame_view->Init();
 775   return frame_view;
 776 }
 777
 778 bool PanelView::CanResize() const {
 779   return true;
 780 }
 781
 782 bool PanelView::CanMaximize() const {
 783   return false;
 784 }
 785
 786 bool PanelView::CanMinimize() const {
 787   return false;
 788 }
 789
 790 base::string16 PanelView::GetWindowTitle() const {
 791   return panel_->GetWindowTitle();
 792 }
 793
 794 gfx::ImageSkia PanelView::GetWindowAppIcon() {
 795   gfx::Image app_icon = panel_->app_icon();
 796   if (app_icon.IsEmpty())
 797     return GetWindowIcon();
 798   else
 799     return *app_icon.ToImageSkia();
 800 }
 801
 802 gfx::ImageSkia PanelView::GetWindowIcon() {
 803   gfx::Image icon = panel_->GetCurrentPageIcon();
 804   return icon.IsEmpty() ? gfx::ImageSkia() : *icon.ToImageSkia();
 805 }
 806
 807 void PanelView::WindowClosing() {
 808   // When closing a panel via window.close, API or the close button,
 809   // ClosePanel() is called first, destroying the native |window_|
 810   // which results in this method being called. ClosePanel() sets
 811   // |window_closed_| to NULL.
 812   // If we still have a |window_closed_| here, the close was triggered by the
 813   // OS, (e.g. clicking on taskbar menu), which destroys the native |window_|
 814   // without invoking ClosePanel() beforehand.
 815   if (!window_closed_) {
 816     panel_->OnWindowClosing();
 817     ClosePanel();
 818     DCHECK(window_closed_);
 819   }
 820 }
 821
 822 void PanelView::DeleteDelegate() {
 823   delete this;
 824 }
 825
 826 void PanelView::OnWindowBeginUserBoundsChange() {
 827   user_resizing_ = true;
 828   panel_->OnPanelStartUserResizing();
 829
 830 #if defined(OS_WIN)
 831   StackedPanelCollection* stack = panel_->stack();
 832   if (stack) {
 833     // Listen to WM_SIZING message in order to find out whether the interior
 834     // edge is being resized such that the specific maximum size could be
 835     // passed to the system.
 836     if (panel_->stack()->GetPanelBelow(panel_.get())) {
 837       ui::HWNDSubclass::AddFilterToTarget(views::HWNDForWidget(window_), this);
 838       user_resizing_interior_stacked_panel_edge_ = false;
 839     }
 840
 841     // Keep track of the original full size of the resizing panel such that it
 842     // can be restored to this size once it is shrunk to minimized state.
 843     original_full_size_of_resizing_panel_ = panel_->full_size();
 844
 845     // Keep track of the original full size of the panel below the resizing
 846     // panel such that it can be restored to this size once it is shrunk to
 847     // minimized state.
 848     Panel* below_panel = stack->GetPanelBelow(panel_.get());
 849     if (below_panel && !below_panel->IsMinimized()) {
 850       original_full_size_of_panel_below_resizing_panel_ =
 851           below_panel->full_size();
 852     }
 853   }
 854 #endif
 855 }
 856
 857 void PanelView::OnWindowEndUserBoundsChange() {
 858   user_resizing_ = false;
 859   panel_->OnPanelEndUserResizing();
 860
 861   // No need to proceed with post-resizing update when there is no size change.
 862   gfx::Rect new_bounds = window_->GetWindowBoundsInScreen();
 863   if (bounds_ == new_bounds)
 864     return;
 865   bounds_ = new_bounds;
 866
 867   panel_->IncreaseMaxSize(bounds_.size());
 868   panel_->set_full_size(bounds_.size());
 869
 870 #if defined(OS_WIN)
 871   StackedPanelCollection* stack = panel_->stack();
 872   if (stack) {
 873     // No need to listen to WM_SIZING message any more.
 874     ui::HWNDSubclass::RemoveFilterFromAllTargets(this);
 875
 876     // If the height of resizing panel shrinks close to the titlebar height,
 877     // treate it as minimized. This could occur when the user is dragging
 878     // 1) the top edge of the top panel downward to shrink it; or
 879     // 2) the bottom edge of any panel upward to shrink it.
 880     if (panel_->GetBounds().height() <
 881             kStackedPanelHeightShrinkThresholdToBecomeMinimized) {
 882       stack->MinimizePanel(panel_.get());
 883       panel_->set_full_size(original_full_size_of_resizing_panel_);
 884     }
 885
 886     // If the height of panel below the resizing panel shrinks close to the
 887     // titlebar height, treat it as minimized. This could occur when the user
 888     // is dragging the bottom edge of non-bottom panel downward to expand it
 889     // and also shrink the panel below.
 890     Panel* below_panel = stack->GetPanelBelow(panel_.get());
 891     if (below_panel && !below_panel->IsMinimized() &&
 892         below_panel->GetBounds().height() <
 893             kStackedPanelHeightShrinkThresholdToBecomeMinimized) {
 894       stack->MinimizePanel(below_panel);
 895       below_panel->set_full_size(
 896           original_full_size_of_panel_below_resizing_panel_);
 897     }
 898   }
 899 #endif
 900
 901   panel_->collection()->RefreshLayout();
 902 }
 903
 904 views::Widget* PanelView::GetWidget() {
 905   return window_;
 906 }
 907
 908 const views::Widget* PanelView::GetWidget() const {
 909   return window_;
 910 }
 911
 912 void PanelView::UpdateLoadingAnimations(bool should_animate) {
 913   GetFrameView()->UpdateThrobber();
 914 }
 915
 916 void PanelView::UpdateWindowTitle() {
 917   window_->UpdateWindowTitle();
 918   GetFrameView()->UpdateTitle();
 919 }
 920
 921 void PanelView::UpdateWindowIcon() {
 922   window_->UpdateWindowIcon();
 923   GetFrameView()->UpdateIcon();
 924 }
 925
 926 void PanelView::Layout() {
 927   // |web_view_| might not be created yet when the window is first created.
 928   if (web_view_)
 929     web_view_->SetBounds(0, 0, width(), height());
 930 }
 931
 932 gfx::Size PanelView::GetMinimumSize() const {
 933   // If the panel is minimized, it can be rendered to very small size, like
 934   // 4-pixel lines when it is docked. Otherwise, its size should not be less
 935   // than its minimum size.
 936   return panel_->IsMinimized() ? gfx::Size() :
 937       gfx::Size(panel::kPanelMinWidth, panel::kPanelMinHeight);
 938 }
 939
 940 gfx::Size PanelView::GetMaximumSize() const {
 941   // If the user is resizing a stacked panel by its bottom edge, make sure its
 942   // height cannot grow more than what the panel below it could offer. This is
 943   // because growing a stacked panel by y amount will shrink the panel below it
 944   // by same amount and we do not want the panel below it being shrunk to be
 945   // smaller than the titlebar.
 946 #if defined(OS_WIN)
 947   if (panel_->stack() && user_resizing_interior_stacked_panel_edge_) {
 948     Panel* below_panel = panel_->stack()->GetPanelBelow(panel_.get());
 949     if (below_panel && !below_panel->IsMinimized()) {
 950       return gfx::Size(0, below_panel->GetBounds().bottom() -
 951           panel_->GetBounds().y() - panel::kTitlebarHeight);
 952     }
 953   }
 954 #endif
 955   return gfx::Size();
 956 }
 957
 958 bool PanelView::AcceleratorPressed(const ui::Accelerator& accelerator) {
 959   if (mouse_pressed_ && accelerator.key_code() == ui::VKEY_ESCAPE) {
 960     OnTitlebarMouseCaptureLost();
 961     return true;
 962   }
 963
 964   // No other accelerator is allowed when the drag begins.
 965   if (mouse_dragging_state_ == DRAGGING_STARTED)
 966     return true;
 967
 968   const std::map<ui::Accelerator, int>& accelerator_table =
 969       GetAcceleratorTable();
 970   std::map<ui::Accelerator, int>::const_iterator iter =
 971       accelerator_table.find(accelerator);
 972   DCHECK(iter != accelerator_table.end());
 973   return panel_->ExecuteCommandIfEnabled(iter->second);
 974 }
 975
 976 void PanelView::OnWidgetDestroying(views::Widget* widget) {
 977   window_ = NULL;
 978 }
 979
 980 void PanelView::OnWidgetActivationChanged(views::Widget* widget, bool active) {
 981 #if defined(OS_WIN)
 982   // WM_NCACTIVATED could be sent when an active window is being destroyed on
 983   // Windows. We need to guard against this.
 984   if (window_closed_)
 985     return;
 986
 987   bool focused = active;
 988   if (chrome::GetActiveDesktop() == chrome::HOST_DESKTOP_TYPE_NATIVE) {
 989     // The panel window is in focus (actually accepting keystrokes) if it is
 990     // active and belongs to a foreground application.
 991     focused = active &&
 992         views::HWNDForWidget(widget) == ::GetForegroundWindow();
 993   }
 994 #else
 995   bool focused = active;
 996 #endif
 997
 998   if (focused_ == focused)
 999     return;
1000   focused_ = focused;
1001
1002   // Expand the panel if the minimized panel is activated by means other than
1003   // clicking on its titlebar. This is the workaround to support restoring the
1004   // minimized panel by other means, like alt-tabbing, win-tabbing, or clicking
1005   // the taskbar icon. Note that this workaround does not work for one edge
1006   // case: the mouse happens to be at the minimized panel when the user tries to
1007   // bring up the panel with the above alternatives.
1008   // When the user clicks on the minimized panel, the panel expansion will be
1009   // done when we process the mouse button pressed message.
1010 #if defined(OS_WIN)
1011   if (focused_ && panel_->IsMinimized() &&
1012       panel_->collection()->type() == PanelCollection::DOCKED &&
1013       gfx::Screen::GetScreenFor(widget->GetNativeWindow())->
1014           GetWindowUnderCursor() != widget->GetNativeWindow()) {
1015     panel_->Restore();
1016   }
1017 #endif
1018
1019   panel()->OnActiveStateChanged(focused);
1020
1021    // Give web contents view a chance to set focus to the appropriate element.
1022   if (focused_) {
1023     content::WebContents* web_contents = panel_->GetWebContents();
1024     if (web_contents)
1025       web_contents->RestoreFocus();
1026   }
1027 }
1028
1029 void PanelView::OnWidgetBoundsChanged(views::Widget* widget,
1030                                       const gfx::Rect& new_bounds) {
1031   if (user_resizing_)
1032     panel()->collection()->OnPanelResizedByMouse(panel(), new_bounds);
1033 }
1034
1035 bool PanelView::OnTitlebarMousePressed(const gfx::Point& mouse_location) {
1036   mouse_pressed_ = true;
1037   mouse_dragging_state_ = NO_DRAGGING;
1038   last_mouse_location_ = mouse_location;
1039   return true;
1040 }
1041
1042 bool PanelView::OnTitlebarMouseDragged(const gfx::Point& mouse_location) {
1043   if (!mouse_pressed_)
1044     return false;
1045
1046   if (mouse_dragging_state_ == NO_DRAGGING &&
1047       ExceededDragThreshold(mouse_location - last_mouse_location_)) {
1048     // When a drag begins, we do not want to the client area to still receive
1049     // the focus. We do not need to do this for the unfocused minimized panel.
1050     if (!panel_->IsMinimized()) {
1051       old_focused_view_ = GetFocusManager()->GetFocusedView();
1052       GetFocusManager()->SetFocusedView(GetFrameView());
1053     }
1054
1055     panel_->manager()->StartDragging(panel_.get(), last_mouse_location_);
1056     mouse_dragging_state_ = DRAGGING_STARTED;
1057   }
1058   if (mouse_dragging_state_ == DRAGGING_STARTED) {
1059     panel_->manager()->Drag(mouse_location);
1060
1061     // Once in drag, update |last_mouse_location_| on each drag fragment, since
1062     // we already dragged the panel up to the current mouse location.
1063     last_mouse_location_ = mouse_location;
1064   }
1065   return true;
1066 }
1067
1068 bool PanelView::OnTitlebarMouseReleased(panel::ClickModifier modifier) {
1069   if (mouse_dragging_state_ != NO_DRAGGING) {
1070     // Ensure dragging a minimized panel does not leave it activated.
1071     // Windows activates a panel on mouse-down, regardless of our attempts
1072     // to prevent activation of a minimized panel. Now that we know mouse-down
1073     // resulted in a mouse-drag, we need to ensure the minimized panel is
1074     // deactivated.
1075     if (panel_->IsMinimized() && focused_)
1076       panel_->Deactivate();
1077
1078     if (mouse_dragging_state_ == DRAGGING_STARTED) {
1079       // When a drag ends, restore the focus.
1080       if (old_focused_view_) {
1081         GetFocusManager()->SetFocusedView(old_focused_view_);
1082         old_focused_view_ = NULL;
1083       }
1084       return EndDragging(false);
1085     }
1086
1087     // The panel drag was cancelled before the mouse is released. Do not
1088     // treat this as a click.
1089     return true;
1090   }
1091
1092   panel_->OnTitlebarClicked(modifier);
1093   return true;
1094 }
1095
1096 bool PanelView::OnTitlebarMouseCaptureLost() {
1097   if (mouse_dragging_state_ == DRAGGING_STARTED)
1098     return EndDragging(true);
1099   return true;
1100 }
1101
1102 bool PanelView::EndDragging(bool cancelled) {
1103   // Only handle clicks that started in our window.
1104   if (!mouse_pressed_)
1105     return false;
1106   mouse_pressed_ = false;
1107
1108   mouse_dragging_state_ = DRAGGING_ENDED;
1109   panel_->manager()->EndDragging(cancelled);
1110   return true;
1111 }
1112
1113 PanelFrameView* PanelView::GetFrameView() const {
1114   return static_cast<PanelFrameView*>(window_->non_client_view()->frame_view());
1115 }
1116
1117 bool PanelView::IsAnimatingBounds() const {
1118   if (bounds_animator_.get() && bounds_animator_->is_animating())
1119     return true;
1120   StackedPanelCollection* stack = panel_->stack();
1121   if (!stack)
1122     return false;
1123   return stack->IsAnimatingPanelBounds(panel_.get());
1124 }
1125
1126 #if defined(OS_WIN)
1127 void PanelView::UpdateWindowAttribute(int attribute_index,
1128                                       int attribute_value_to_set,
1129                                       int attribute_value_to_reset,
1130                                       bool update_frame) {
1131   HWND native_window = views::HWNDForWidget(window_);
1132   int value = ::GetWindowLong(native_window, attribute_index);
1133   int expected_value = value;
1134   if (attribute_value_to_set)
1135     expected_value |=  attribute_value_to_set;
1136   if (attribute_value_to_reset)
1137     expected_value &=  ~attribute_value_to_reset;
1138   if (value != expected_value)
1139     ::SetWindowLong(native_window, attribute_index, expected_value);
1140
1141   // Per MSDN, if any of the frame styles is changed, SetWindowPos with the
1142   // SWP_FRAMECHANGED flag must be called in order for the cached window data
1143   // to be updated properly.
1144   // http://msdn.microsoft.com/en-us/library/windows/desktop/ms633591(v=vs.85).aspx
1145   if (update_frame) {
1146     ::SetWindowPos(native_window, NULL, 0, 0, 0, 0,
1147                    SWP_FRAMECHANGED | SWP_NOMOVE | SWP_NOSIZE |
1148                        SWP_NOZORDER | SWP_NOACTIVATE);
1149   }
1150 }
1151 #endif