chrome/browser/ui/views/panels/panel

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This source file includes following definitions.
GetAcceleratorTable
PressLeftMouseButtonTitlebar
ReleaseMouseButtonTitlebar
DragTitlebar
CancelDragTitlebar
FinishDragTitlebar
VerifyDrawingAttention
VerifyActiveState
VerifyAppIcon
VerifySystemMinimizeState
IsWindowVisible
IsWindowSizeKnown
IsAnimatingBounds
IsButtonVisible
GetWindowCornerStyle
EnsureApplicationRunOnForeground
CreateNativePanel
old_focused_view_
ShowPanel
ShowPanelInactive
GetPanelBounds
SetPanelBounds
SetPanelBoundsInstantly
SetBoundsInternal
FilterMessage
AnimationEnded
AnimationProgressed
SetWidgetBounds
ClosePanel
ActivatePanel
DeactivatePanel
IsPanelActive
PreventActivationByOS
GetNativePanelWindow
UpdatePanelTitleBar
UpdatePanelLoadingAnimations
PanelWebContentsFocused
PanelCut
PanelCopy
PanelPaste
DrawAttention
IsDrawingAttention
HandlePanelKeyboardEvent
FullScreenModeChanged
IsPanelAlwaysOnTop
SetPanelAlwaysOnTop
UpdatePanelMinimizeRestoreButtonVisibility
SetWindowCornerStyle
PanelExpansionStateChanging
WindowSizeFromContentSize
ContentSizeFromWindowSize
TitleOnlyHeight
MinimizePanelBySystem
IsPanelMinimizedBySystem
IsPanelShownOnActiveDesktop
ShowShadow
AttachWebContents
DetachWebContents
CreateNativePanelTesting
OnDisplayChanged
OnWorkAreaChanged
WillProcessWorkAreaChange
GetContentsView
CreateNonClientFrameView
CanResize
CanMaximize
GetWindowTitle
GetWindowAppIcon
GetWindowIcon
WindowClosing
DeleteDelegate
OnWindowBeginUserBoundsChange
OnWindowEndUserBoundsChange
GetWidget
GetWidget
UpdateLoadingAnimations
UpdateWindowTitle
UpdateWindowIcon
Layout
GetMinimumSize
GetMaximumSize
AcceleratorPressed
OnWidgetDestroying
OnWidgetActivationChanged
OnWidgetBoundsChanged
OnTitlebarMousePressed
OnTitlebarMouseDragged
OnTitlebarMouseReleased
OnTitlebarMouseCaptureLost
EndDragging
GetFrameView
IsAnimatingBounds
IsWithinResizingArea
UpdateWindowAttribute
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "chrome/browser/ui/views/panels/panel_view.h"

#include <map>
#include "base/logging.h"
#include "base/message_loop/message_loop.h"
#include "base/strings/utf_string_conversions.h"
#include "chrome/app/chrome_command_ids.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/ui/host_desktop.h"
#include "chrome/browser/ui/panels/panel.h"
#include "chrome/browser/ui/panels/panel_bounds_animation.h"
#include "chrome/browser/ui/panels/panel_manager.h"
#include "chrome/browser/ui/panels/stacked_panel_collection.h"
#include "chrome/browser/ui/views/auto_keep_alive.h"
#include "chrome/browser/ui/views/panels/panel_frame_view.h"
#include "content/public/browser/render_view_host.h"
#include "content/public/browser/render_widget_host_view.h"
#include "content/public/browser/web_contents.h"
#include "content/public/browser/web_contents_view.h"
#include "ui/gfx/image/image.h"
#include "ui/gfx/path.h"
#include "ui/gfx/screen.h"
#include "ui/views/controls/button/image_button.h"
#include "ui/views/controls/webview/webview.h"
#include "ui/views/widget/widget.h"

#if defined(OS_WIN)
#include "base/win/windows_version.h"
#include "chrome/browser/shell_integration.h"
#include "chrome/browser/ui/views/panels/taskbar_window_thumbnailer_win.h"
#include "ui/base/win/shell.h"
#include "ui/gfx/icon_util.h"
#include "ui/views/win/hwnd_util.h"
#endif

namespace {

#if defined(OS_WIN)
// If the height of a stacked panel shrinks below this threshold during the
// user resizing, it will be treated as minimized.
const int kStackedPanelHeightShrinkThresholdToBecomeMinimized =
    panel::kTitlebarHeight + 20;
#endif

// Supported accelerators.
// Note: We can't use the acclerator table defined in chrome/browser/ui/views
// due to checkdeps violation.
struct AcceleratorMapping {
  ui::KeyboardCode keycode;
  int modifiers;
  int command_id;
};
const AcceleratorMapping kPanelAcceleratorMap[] = {
  { ui::VKEY_W, ui::EF_CONTROL_DOWN, IDC_CLOSE_WINDOW },
  { ui::VKEY_W, ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN, IDC_CLOSE_WINDOW },
  { ui::VKEY_F4, ui::EF_ALT_DOWN, IDC_CLOSE_WINDOW },
  { ui::VKEY_R, ui::EF_CONTROL_DOWN, IDC_RELOAD },
  { ui::VKEY_F5, ui::EF_NONE, IDC_RELOAD },
  { ui::VKEY_R, ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN,
      IDC_RELOAD_IGNORING_CACHE },
  { ui::VKEY_F5, ui::EF_CONTROL_DOWN, IDC_RELOAD_IGNORING_CACHE },
  { ui::VKEY_F5, ui::EF_SHIFT_DOWN, IDC_RELOAD_IGNORING_CACHE },
  { ui::VKEY_ESCAPE, ui::EF_NONE, IDC_STOP },
  { ui::VKEY_OEM_MINUS, ui::EF_CONTROL_DOWN, IDC_ZOOM_MINUS },
  { ui::VKEY_SUBTRACT, ui::EF_CONTROL_DOWN, IDC_ZOOM_MINUS },
  { ui::VKEY_0, ui::EF_CONTROL_DOWN, IDC_ZOOM_NORMAL },
  { ui::VKEY_NUMPAD0, ui::EF_CONTROL_DOWN, IDC_ZOOM_NORMAL },
  { ui::VKEY_OEM_PLUS, ui::EF_CONTROL_DOWN, IDC_ZOOM_PLUS },
  { ui::VKEY_ADD, ui::EF_CONTROL_DOWN, IDC_ZOOM_PLUS },
  { ui::VKEY_I, ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN, IDC_DEV_TOOLS },
  { ui::VKEY_J, ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN,
    IDC_DEV_TOOLS_CONSOLE },
};

const std::map<ui::Accelerator, int>& GetAcceleratorTable() {
  static std::map<ui::Accelerator, int>* accelerators = NULL;
  if (!accelerators) {
    accelerators = new std::map<ui::Accelerator, int>();
    for (size_t i = 0; i < arraysize(kPanelAcceleratorMap); ++i) {
      ui::Accelerator accelerator(kPanelAcceleratorMap[i].keycode,
                                  kPanelAcceleratorMap[i].modifiers);
      (*accelerators)[accelerator] = kPanelAcceleratorMap[i].command_id;
    }
  }
  return *accelerators;
}

// NativePanelTesting implementation.
class NativePanelTestingWin : public NativePanelTesting {
 public:
  explicit NativePanelTestingWin(PanelView* panel_view);

 private:
  virtual void PressLeftMouseButtonTitlebar(
      const gfx::Point& mouse_location, panel::ClickModifier modifier) OVERRIDE;
  virtual void ReleaseMouseButtonTitlebar(
      panel::ClickModifier modifier) OVERRIDE;
  virtual void DragTitlebar(const gfx::Point& mouse_location) OVERRIDE;
  virtual void CancelDragTitlebar() OVERRIDE;
  virtual void FinishDragTitlebar() OVERRIDE;
  virtual bool VerifyDrawingAttention() const OVERRIDE;
  virtual bool VerifyActiveState(bool is_active) OVERRIDE;
  virtual bool VerifyAppIcon() const OVERRIDE;
  virtual bool VerifySystemMinimizeState() const OVERRIDE;
  virtual bool IsWindowVisible() const OVERRIDE;
  virtual bool IsWindowSizeKnown() const OVERRIDE;
  virtual bool IsAnimatingBounds() const OVERRIDE;
  virtual bool IsButtonVisible(
      panel::TitlebarButtonType button_type) const OVERRIDE;
  virtual panel::CornerStyle GetWindowCornerStyle() const OVERRIDE;
  virtual bool EnsureApplicationRunOnForeground() OVERRIDE;

  PanelView* panel_view_;
};

NativePanelTestingWin::NativePanelTestingWin(PanelView* panel_view)
    : panel_view_(panel_view) {
}

void NativePanelTestingWin::PressLeftMouseButtonTitlebar(
    const gfx::Point& mouse_location, panel::ClickModifier modifier) {
  panel_view_->OnTitlebarMousePressed(mouse_location);
}

void NativePanelTestingWin::ReleaseMouseButtonTitlebar(
    panel::ClickModifier modifier) {
  panel_view_->OnTitlebarMouseReleased(modifier);
}

void NativePanelTestingWin::DragTitlebar(const gfx::Point& mouse_location) {
  panel_view_->OnTitlebarMouseDragged(mouse_location);
}

void NativePanelTestingWin::CancelDragTitlebar() {
  panel_view_->OnTitlebarMouseCaptureLost();
}

void NativePanelTestingWin::FinishDragTitlebar() {
  panel_view_->OnTitlebarMouseReleased(panel::NO_MODIFIER);
}

bool NativePanelTestingWin::VerifyDrawingAttention() const {
  base::MessageLoop::current()->RunUntilIdle();
  return panel_view_->GetFrameView()->GetPaintState() ==
         PanelFrameView::PAINT_FOR_ATTENTION;
}

bool NativePanelTestingWin::VerifyActiveState(bool is_active) {
  return panel_view_->GetFrameView()->GetPaintState() ==
         (is_active ? PanelFrameView::PAINT_AS_ACTIVE
                    : PanelFrameView::PAINT_AS_INACTIVE);
}

bool NativePanelTestingWin::VerifyAppIcon() const {
#if defined(OS_WIN)
  // We only care about Windows 7 and later.
  if (base::win::GetVersion() < base::win::VERSION_WIN7)
    return true;

  HWND native_window = views::HWNDForWidget(panel_view_->window());
  HICON app_icon = reinterpret_cast<HICON>(
      ::SendMessage(native_window, WM_GETICON, ICON_BIG, 0L));
  if (!app_icon)
    return false;
  scoped_ptr<SkBitmap> bitmap(IconUtil::CreateSkBitmapFromHICON(app_icon));
  return bitmap.get() &&
         bitmap->width() == panel::kPanelAppIconSize &&
         bitmap->height() == panel::kPanelAppIconSize;
#else
  return true;
#endif
}

bool NativePanelTestingWin::VerifySystemMinimizeState() const {
#if defined(OS_WIN)
  HWND native_window = views::HWNDForWidget(panel_view_->window());
  WINDOWPLACEMENT placement;
  if (!::GetWindowPlacement(native_window, &placement))
    return false;
  if (placement.showCmd == SW_MINIMIZE || placement.showCmd == SW_SHOWMINIMIZED)
    return true;

  // If the panel window has owner window, as in stacked mode, check its owner
  // window. Note that owner window, instead of parent window, is returned
  // though GWL_HWNDPARENT contains 'parent'.
  HWND owner_window =
      reinterpret_cast<HWND>(::GetWindowLongPtr(native_window,
                                                GWLP_HWNDPARENT));
  if (!owner_window || !::GetWindowPlacement(owner_window, &placement))
    return false;
  return placement.showCmd == SW_MINIMIZE ||
         placement.showCmd == SW_SHOWMINIMIZED;
#else
  return true;
#endif
}

bool NativePanelTestingWin::IsWindowVisible() const {
#if defined(OS_WIN)
  HWND native_window = views::HWNDForWidget(panel_view_->window());
  return ::IsWindowVisible(native_window) == TRUE;
#else
  return panel_view_->visible();
#endif
}

bool NativePanelTestingWin::IsWindowSizeKnown() const {
  return true;
}

bool NativePanelTestingWin::IsAnimatingBounds() const {
  return panel_view_->IsAnimatingBounds();
}

bool NativePanelTestingWin::IsButtonVisible(
    panel::TitlebarButtonType button_type) const {
  PanelFrameView* frame_view = panel_view_->GetFrameView();

  switch (button_type) {
    case panel::CLOSE_BUTTON:
      return frame_view->close_button()->visible();
    case panel::MINIMIZE_BUTTON:
      return frame_view->minimize_button()->visible();
    case panel::RESTORE_BUTTON:
      return frame_view->restore_button()->visible();
    default:
      NOTREACHED();
  }
  return false;
}

panel::CornerStyle NativePanelTestingWin::GetWindowCornerStyle() const {
  return panel_view_->GetFrameView()->corner_style();
}

bool NativePanelTestingWin::EnsureApplicationRunOnForeground() {
  // Not needed on views.
  return true;
}

}  // namespace

// static
NativePanel* Panel::CreateNativePanel(Panel* panel,
                                      const gfx::Rect& bounds,
                                      bool always_on_top) {
  return new PanelView(panel, bounds, always_on_top);
}

// The panel window has to be created as always-on-top. We cannot create it
// as non-always-on-top and then change it to always-on-top because Windows
// system might deny making a window always-on-top if the application is not
// a foreground application.
PanelView::PanelView(Panel* panel, const gfx::Rect& bounds, bool always_on_top)
    : panel_(panel),
      bounds_(bounds),
      window_(NULL),
      window_closed_(false),
      web_view_(NULL),
      always_on_top_(always_on_top),
      focused_(false),
      user_resizing_(false),
#if defined(OS_WIN)
      user_resizing_interior_stacked_panel_edge_(false),
#endif
      mouse_pressed_(false),
      mouse_dragging_state_(NO_DRAGGING),
      is_drawing_attention_(false),
      force_to_paint_as_inactive_(false),
      old_focused_view_(NULL) {
  window_ = new views::Widget;
  views::Widget::InitParams params(views::Widget::InitParams::TYPE_WINDOW);
  params.delegate = this;
  params.remove_standard_frame = true;
  params.keep_on_top = always_on_top;
  params.visible_on_all_workspaces = always_on_top;
  params.bounds = bounds;
  window_->Init(params);
  window_->set_frame_type(views::Widget::FRAME_TYPE_FORCE_CUSTOM);
  window_->set_focus_on_creation(false);
  window_->AddObserver(this);

  // Prevent the browser process from shutting down while this window is open.
  keep_alive_.reset(new AutoKeepAlive(GetNativePanelWindow()));

  web_view_ = new views::WebView(NULL);
  AddChildView(web_view_);

  // Register accelarators supported by panels.
  views::FocusManager* focus_manager = GetFocusManager();
  const std::map<ui::Accelerator, int>& accelerator_table =
      GetAcceleratorTable();
  for (std::map<ui::Accelerator, int>::const_iterator iter =
           accelerator_table.begin();
       iter != accelerator_table.end(); ++iter) {
    focus_manager->RegisterAccelerator(
        iter->first, ui::AcceleratorManager::kNormalPriority, this);
  }

#if defined(OS_WIN)
  ui::win::SetAppIdForWindow(
      ShellIntegration::GetAppModelIdForProfile(
          base::UTF8ToWide(panel->app_name()), panel->profile()->GetPath()),
      views::HWNDForWidget(window_));
  ui::win::PreventWindowFromPinning(views::HWNDForWidget(window_));
#endif
}

PanelView::~PanelView() {
}

void PanelView::ShowPanel() {
  ShowPanelInactive();
  ActivatePanel();
}

void PanelView::ShowPanelInactive() {
  if (window_->IsVisible())
    return;
  window_->ShowInactive();
  // No animation is used for initial creation of a panel on Win.
  // Signal immediately that pending actions can be performed.
  panel_->manager()->OnPanelAnimationEnded(panel_.get());
}

gfx::Rect PanelView::GetPanelBounds() const {
  return bounds_;
}

void PanelView::SetPanelBounds(const gfx::Rect& bounds) {
  SetBoundsInternal(bounds, true);
}

void PanelView::SetPanelBoundsInstantly(const gfx::Rect& bounds) {
  SetBoundsInternal(bounds, false);
}

void PanelView::SetBoundsInternal(const gfx::Rect& new_bounds, bool animate) {
  if (bounds_ == new_bounds)
    return;

  bounds_ = new_bounds;

  if (!animate) {
    // If no animation is in progress, apply bounds change instantly. Otherwise,
    // continue the animation with new target bounds.
    if (!IsAnimatingBounds())
      SetWidgetBounds(bounds_);
    return;
  }

  animation_start_bounds_ = window_->GetWindowBoundsInScreen();

  bounds_animator_.reset(new PanelBoundsAnimation(
      this, panel_.get(), animation_start_bounds_, new_bounds));
  bounds_animator_->Start();
}

#if defined(OS_WIN)
bool PanelView::FilterMessage(HWND hwnd,
                              UINT message,
                              WPARAM w_param,
                              LPARAM l_param,
                              LRESULT* l_result) {
  switch (message) {
    case WM_SIZING:
      if (w_param == WMSZ_BOTTOM)
        user_resizing_interior_stacked_panel_edge_ = true;
      break;
  }
  return false;
}
#endif

void PanelView::AnimationEnded(const gfx::Animation* animation) {
  panel_->manager()->OnPanelAnimationEnded(panel_.get());
}

void PanelView::AnimationProgressed(const gfx::Animation* animation) {
  gfx::Rect new_bounds = bounds_animator_->CurrentValueBetween(
      animation_start_bounds_, bounds_);
  SetWidgetBounds(new_bounds);
}

void PanelView::SetWidgetBounds(const gfx::Rect& new_bounds) {
#if defined(OS_WIN)
  // An overlapped window is a top-level window that has a titlebar, border,
  // and client area. The Windows system will automatically put the shadow
  // around the whole window. Also the system will enforce the minimum height
  // (38 pixels based on observation) for the overlapped window such that it
  // will always has the space for the titlebar.
  //
  // On contrast, a popup window is a bare minimum window without border and
  // titlebar by default. It is often used for the popup menu and the window
  // with short life. The Windows system does not add the shadow around the
  // whole window though CS_DROPSHADOW class style could be passed to add the
  // drop shadow which is only around the right and bottom edges.
  //
  // The height of the title-only or minimized panel is smaller than the minimum
  // overlapped window height. If the panel still uses the overlapped window
  // style, Windows system will automatically increase the window height. To
  // work around this limitation, we temporarily change the window style to
  // popup when the height to set is smaller than the minimum overlapped window
  // height and then restore the window style to overlapped when the height
  // grows.
  static const int kMinimumOverlappedWindowHeight = 38;
  gfx::Rect old_bounds = GetWidget()->GetRestoredBounds();
  if (old_bounds.height() > kMinimumOverlappedWindowHeight &&
      new_bounds.height() <= kMinimumOverlappedWindowHeight) {
    // When the panel height shrinks below the minimum overlapped window height,
    // change the window style to popup such that we can show the title-only
    // and minimized panel without additional height being added by the system.
    UpdateWindowAttribute(GWL_STYLE,
                          WS_POPUP,
                          WS_OVERLAPPED | WS_THICKFRAME | WS_SYSMENU,
                          true);
  } else if (old_bounds.height() <= kMinimumOverlappedWindowHeight &&
             new_bounds.height() > kMinimumOverlappedWindowHeight) {
    // Change the window style back to overlappped when the panel height grow
    // taller than the minimum overlapped window height.
    UpdateWindowAttribute(GWL_STYLE,
                          WS_OVERLAPPED | WS_THICKFRAME | WS_SYSMENU,
                          WS_POPUP,
                          true);
  }
#endif

  GetWidget()->SetBounds(new_bounds);
}

void PanelView::ClosePanel() {
  // We're already closing. Do nothing.
  if (window_closed_)
    return;

  if (!panel_->ShouldCloseWindow())
    return;

  // Cancel any currently running animation since we're closing down.
  if (bounds_animator_.get())
    bounds_animator_.reset();

  if (panel_->GetWebContents()) {
    // Still have web contents. Allow renderer to shut down.
    // When web contents are destroyed, we will be called back again.
    panel_->OnWindowClosing();
    return;
  }

  panel_->OnNativePanelClosed();
  if (window_)
    window_->Close();
  window_closed_ = true;
}

void PanelView::ActivatePanel() {
  window_->Activate();
}

void PanelView::DeactivatePanel() {
  if (!focused_)
    return;

#if defined(OS_WIN)
  // Need custom behavior for always-on-top panels to avoid
  // the OS activating a minimized panel when this one is
  // deactivated.
  if (always_on_top_) {
    ::SetForegroundWindow(::GetDesktopWindow());
    return;
  }
#endif

  window_->Deactivate();
}

bool PanelView::IsPanelActive() const {
  return focused_;
}

void PanelView::PreventActivationByOS(bool prevent_activation) {
#if defined(OS_WIN)
  // Set the flags "NoActivate" to make sure the minimized panels do not get
  // activated by the OS. In addition, set "AppWindow" to make sure the
  // minimized panels do appear in the taskbar and Alt-Tab menu if it is not
  // in a stack.
  int value_to_change = WS_EX_NOACTIVATE;
  if (!panel_->stack())
    value_to_change |= WS_EX_APPWINDOW;
  if (prevent_activation)
    UpdateWindowAttribute(GWL_EXSTYLE, value_to_change, 0, false);
  else
    UpdateWindowAttribute(GWL_EXSTYLE, 0, value_to_change, false);
#endif
}

gfx::NativeWindow PanelView::GetNativePanelWindow() {
  return window_->GetNativeWindow();
}

void PanelView::UpdatePanelTitleBar() {
  UpdateWindowTitle();
  UpdateWindowIcon();
}

void PanelView::UpdatePanelLoadingAnimations(bool should_animate) {
  GetFrameView()->UpdateThrobber();
}

void PanelView::PanelWebContentsFocused(content::WebContents* contents) {
  web_view_->OnWebContentsFocused(contents);
}

void PanelView::PanelCut() {
  // Nothing to do since we do not have panel-specific system menu.
  NOTREACHED();
}

void PanelView::PanelCopy() {
  // Nothing to do since we do not have panel-specific system menu.
  NOTREACHED();
}

void PanelView::PanelPaste() {
  // Nothing to do since we do not have panel-specific system menu.
  NOTREACHED();
}

void PanelView::DrawAttention(bool draw_attention) {
  DCHECK((panel_->attention_mode() & Panel::USE_PANEL_ATTENTION) != 0);

  if (is_drawing_attention_ == draw_attention)
    return;
  is_drawing_attention_ = draw_attention;
  GetFrameView()->SchedulePaint();

  if ((panel_->attention_mode() & Panel::USE_SYSTEM_ATTENTION) != 0) {
#if defined(OS_WIN)
    // The default implementation of Widget::FlashFrame only flashes 5 times.
    // We need more than that.
    FLASHWINFO fwi;
    fwi.cbSize = sizeof(fwi);
    fwi.hwnd = views::HWNDForWidget(window_);
    if (draw_attention) {
      fwi.dwFlags = FLASHW_ALL;
      fwi.uCount = panel::kNumberOfTimesToFlashPanelForAttention;
      fwi.dwTimeout = 0;
    } else {
      // TODO(jianli): calling FlashWindowEx with FLASHW_STOP flag for the
      // panel window has the same problem as the stack window. However,
      // we cannot take the similar fix since there is no background window
      // to replace for the regular panel window. More investigation is needed.
      fwi.dwFlags = FLASHW_STOP;
    }
    ::FlashWindowEx(&fwi);
#else
    window_->FlashFrame(draw_attention);
#endif
  }
}

bool PanelView::IsDrawingAttention() const {
  return is_drawing_attention_;
}

void PanelView::HandlePanelKeyboardEvent(
    const content::NativeWebKeyboardEvent& event) {
  views::FocusManager* focus_manager = GetFocusManager();
  if (focus_manager->shortcut_handling_suspended())
    return;

  ui::Accelerator accelerator(
      static_cast<ui::KeyboardCode>(event.windowsKeyCode),
      content::GetModifiersFromNativeWebKeyboardEvent(event));
  if (event.type == blink::WebInputEvent::KeyUp)
    accelerator.set_type(ui::ET_KEY_RELEASED);
  focus_manager->ProcessAccelerator(accelerator);
}

void PanelView::FullScreenModeChanged(bool is_full_screen) {
  if (is_full_screen) {
    if (window_->IsVisible() && always_on_top_)
      window_->Hide();
  } else {
    if (!window_->IsVisible()) {
      ShowPanelInactive();

#if defined(OS_WIN)
      // When hiding and showing again a top-most window that belongs to a
      // background application (i.e. the application is not a foreground one),
      // the window may loose top-most placement even though its WS_EX_TOPMOST
      // bit is still set. Re-issuing SetWindowsPos() returns the window to its
      // top-most placement.
      if (always_on_top_)
        window_->SetAlwaysOnTop(true);
#endif
    }
  }
}

bool PanelView::IsPanelAlwaysOnTop() const {
  return always_on_top_;
}

void PanelView::SetPanelAlwaysOnTop(bool on_top) {
  if (always_on_top_ == on_top)
    return;
  always_on_top_ = on_top;

  window_->SetAlwaysOnTop(on_top);
  window_->SetVisibleOnAllWorkspaces(on_top);
  window_->non_client_view()->Layout();
  window_->client_view()->Layout();
}

void PanelView::UpdatePanelMinimizeRestoreButtonVisibility() {
  GetFrameView()->UpdateTitlebarMinimizeRestoreButtonVisibility();
}

void PanelView::SetWindowCornerStyle(panel::CornerStyle corner_style) {
  GetFrameView()->SetWindowCornerStyle(corner_style);
}

void PanelView::PanelExpansionStateChanging(Panel::ExpansionState old_state,
                                            Panel::ExpansionState new_state) {
#if defined(OS_WIN)
  // Live preview is only available since Windows 7.
  if (base::win::GetVersion() < base::win::VERSION_WIN7)
    return;

  if (panel_->collection()->type() != PanelCollection::DOCKED)
    return;

  bool is_minimized = old_state != Panel::EXPANDED;
  bool will_be_minimized = new_state != Panel::EXPANDED;
  if (is_minimized == will_be_minimized)
    return;

  HWND native_window = views::HWNDForWidget(window_);

  if (!thumbnailer_.get()) {
    DCHECK(native_window);
    thumbnailer_.reset(new TaskbarWindowThumbnailerWin(native_window, NULL));
  }

  // Cache the image at this point.
  if (will_be_minimized) {
    // If the panel is still active (we will deactivate the minimizd panel at
    // later time), we need to paint it immediately as inactive so that we can
    // take a snapshot of inactive panel.
    if (focused_) {
      force_to_paint_as_inactive_ = true;
      ::RedrawWindow(native_window, NULL, NULL,
                     RDW_NOCHILDREN | RDW_INVALIDATE | RDW_UPDATENOW);
    }

    // Start the thumbnailer and capture the snapshot now.
    thumbnailer_->Start();
    thumbnailer_->CaptureSnapshot();
  } else {
    force_to_paint_as_inactive_ = false;
    thumbnailer_->Stop();
  }

#endif
}

gfx::Size PanelView::WindowSizeFromContentSize(
    const gfx::Size& content_size) const {
  gfx::Size frame = GetFrameView()->NonClientAreaSize();
  return gfx::Size(content_size.width() + frame.width(),
                   content_size.height() + frame.height());
}

gfx::Size PanelView::ContentSizeFromWindowSize(
    const gfx::Size& window_size) const {
  gfx::Size frame = GetFrameView()->NonClientAreaSize();
  return gfx::Size(window_size.width() - frame.width(),
                   window_size.height() - frame.height());
}

int PanelView::TitleOnlyHeight() const {
  return panel::kTitlebarHeight;
}

void PanelView::MinimizePanelBySystem() {
  window_->Minimize();
}

bool PanelView::IsPanelMinimizedBySystem() const {
  return window_->IsMinimized();
}

bool PanelView::IsPanelShownOnActiveDesktop() const {
#if defined(OS_WIN)
  // Virtual desktop is not supported by the native Windows system.
  return true;
#else
  NOTIMPLEMENTED();
  return true;
#endif
}

void PanelView::ShowShadow(bool show) {
#if defined(OS_WIN)
  // The overlapped window has the shadow while the popup window does not have
  // the shadow.
  int overlap_style = WS_OVERLAPPED | WS_THICKFRAME | WS_SYSMENU;
  int popup_style = WS_POPUP;
  UpdateWindowAttribute(GWL_STYLE,
                        show ? overlap_style : popup_style,
                        show ? popup_style : overlap_style,
                        true);
#endif
}

void PanelView::AttachWebContents(content::WebContents* contents) {
  web_view_->SetWebContents(contents);
}

void PanelView::DetachWebContents(content::WebContents* contents) {
  web_view_->SetWebContents(NULL);
}

NativePanelTesting* PanelView::CreateNativePanelTesting() {
  return new NativePanelTestingWin(this);
}

void PanelView::OnDisplayChanged() {
  panel_->manager()->display_settings_provider()->OnDisplaySettingsChanged();
}

void PanelView::OnWorkAreaChanged() {
  panel_->manager()->display_settings_provider()->OnDisplaySettingsChanged();
}

bool PanelView::WillProcessWorkAreaChange() const {
  return true;
}

views::View* PanelView::GetContentsView() {
  return this;
}

views::NonClientFrameView* PanelView::CreateNonClientFrameView(
    views::Widget* widget) {
  PanelFrameView* frame_view = new PanelFrameView(this);
  frame_view->Init();
  return frame_view;
}

bool PanelView::CanResize() const {
  return true;
}

bool PanelView::CanMaximize() const {
  return false;
}

base::string16 PanelView::GetWindowTitle() const {
  return panel_->GetWindowTitle();
}

gfx::ImageSkia PanelView::GetWindowAppIcon() {
  gfx::Image app_icon = panel_->app_icon();
  if (app_icon.IsEmpty())
    return GetWindowIcon();
  else
    return *app_icon.ToImageSkia();
}

gfx::ImageSkia PanelView::GetWindowIcon() {
  gfx::Image icon = panel_->GetCurrentPageIcon();
  return icon.IsEmpty() ? gfx::ImageSkia() : *icon.ToImageSkia();
}

void PanelView::WindowClosing() {
  // When closing a panel via window.close, API or the close button,
  // ClosePanel() is called first, destroying the native |window_|
  // which results in this method being called. ClosePanel() sets
  // |window_closed_| to NULL.
  // If we still have a |window_closed_| here, the close was triggered by the
  // OS, (e.g. clicking on taskbar menu), which destroys the native |window_|
  // without invoking ClosePanel() beforehand.
  if (!window_closed_) {
    panel_->OnWindowClosing();
    ClosePanel();
    DCHECK(window_closed_);
  }
}

void PanelView::DeleteDelegate() {
  delete this;
}

void PanelView::OnWindowBeginUserBoundsChange() {
  user_resizing_ = true;
  panel_->OnPanelStartUserResizing();

#if defined(OS_WIN)
  StackedPanelCollection* stack = panel_->stack();
  if (stack) {
    // Listen to WM_SIZING message in order to find out whether the interior
    // edge is being resized such that the specific maximum size could be
    // passed to the system.
    if (panel_->stack()->GetPanelBelow(panel_.get())) {
      ui::HWNDSubclass::AddFilterToTarget(views::HWNDForWidget(window_), this);
      user_resizing_interior_stacked_panel_edge_ = false;
    }

    // Keep track of the original full size of the resizing panel such that it
    // can be restored to this size once it is shrunk to minimized state.
    original_full_size_of_resizing_panel_ = panel_->full_size();

    // Keep track of the original full size of the panel below the resizing
    // panel such that it can be restored to this size once it is shrunk to
    // minimized state.
    Panel* below_panel = stack->GetPanelBelow(panel_.get());
    if (below_panel && !below_panel->IsMinimized()) {
      original_full_size_of_panel_below_resizing_panel_ =
          below_panel->full_size();
    }
  }
#endif
}

void PanelView::OnWindowEndUserBoundsChange() {
  user_resizing_ = false;
  panel_->OnPanelEndUserResizing();

  // No need to proceed with post-resizing update when there is no size change.
  gfx::Rect new_bounds = window_->GetWindowBoundsInScreen();
  if (bounds_ == new_bounds)
    return;
  bounds_ = new_bounds;

  panel_->IncreaseMaxSize(bounds_.size());
  panel_->set_full_size(bounds_.size());

#if defined(OS_WIN)
  StackedPanelCollection* stack = panel_->stack();
  if (stack) {
    // No need to listen to WM_SIZING message any more.
    ui::HWNDSubclass::RemoveFilterFromAllTargets(this);

    // If the height of resizing panel shrinks close to the titlebar height,
    // treate it as minimized. This could occur when the user is dragging
    // 1) the top edge of the top panel downward to shrink it; or
    // 2) the bottom edge of any panel upward to shrink it.
    if (panel_->GetBounds().height() <
            kStackedPanelHeightShrinkThresholdToBecomeMinimized) {
      stack->MinimizePanel(panel_.get());
      panel_->set_full_size(original_full_size_of_resizing_panel_);
    }

    // If the height of panel below the resizing panel shrinks close to the
    // titlebar height, treat it as minimized. This could occur when the user
    // is dragging the bottom edge of non-bottom panel downward to expand it
    // and also shrink the panel below.
    Panel* below_panel = stack->GetPanelBelow(panel_.get());
    if (below_panel && !below_panel->IsMinimized() &&
        below_panel->GetBounds().height() <
            kStackedPanelHeightShrinkThresholdToBecomeMinimized) {
      stack->MinimizePanel(below_panel);
      below_panel->set_full_size(
          original_full_size_of_panel_below_resizing_panel_);
    }
  }
#endif

  panel_->collection()->RefreshLayout();
}

views::Widget* PanelView::GetWidget() {
  return window_;
}

const views::Widget* PanelView::GetWidget() const {
  return window_;
}

void PanelView::UpdateLoadingAnimations(bool should_animate) {
  GetFrameView()->UpdateThrobber();
}

void PanelView::UpdateWindowTitle() {
  window_->UpdateWindowTitle();
  GetFrameView()->UpdateTitle();
}

void PanelView::UpdateWindowIcon() {
  window_->UpdateWindowIcon();
  GetFrameView()->UpdateIcon();
}

void PanelView::Layout() {
  // |web_view_| might not be created yet when the window is first created.
  if (web_view_)
    web_view_->SetBounds(0, 0, width(), height());
}

gfx::Size PanelView::GetMinimumSize() {
  // If the panel is minimized, it can be rendered to very small size, like
  // 4-pixel lines when it is docked. Otherwise, its size should not be less
  // than its minimum size.
  return panel_->IsMinimized() ? gfx::Size() :
      gfx::Size(panel::kPanelMinWidth, panel::kPanelMinHeight);
}

gfx::Size PanelView::GetMaximumSize() {
  // If the user is resizing a stacked panel by its bottom edge, make sure its
  // height cannot grow more than what the panel below it could offer. This is
  // because growing a stacked panel by y amount will shrink the panel below it
  // by same amount and we do not want the panel below it being shrunk to be
  // smaller than the titlebar.
#if defined(OS_WIN)
  if (panel_->stack() && user_resizing_interior_stacked_panel_edge_) {
    Panel* below_panel = panel_->stack()->GetPanelBelow(panel_.get());
    if (below_panel && !below_panel->IsMinimized()) {
      return gfx::Size(0, below_panel->GetBounds().bottom() -
          panel_->GetBounds().y() - panel::kTitlebarHeight);
    }
  }
#endif
  return gfx::Size();
}

bool PanelView::AcceleratorPressed(const ui::Accelerator& accelerator) {
  if (mouse_pressed_ && accelerator.key_code() == ui::VKEY_ESCAPE) {
    OnTitlebarMouseCaptureLost();
    return true;
  }

  // No other accelerator is allowed when the drag begins.
  if (mouse_dragging_state_ == DRAGGING_STARTED)
    return true;

  const std::map<ui::Accelerator, int>& accelerator_table =
      GetAcceleratorTable();
  std::map<ui::Accelerator, int>::const_iterator iter =
      accelerator_table.find(accelerator);
  DCHECK(iter != accelerator_table.end());
  return panel_->ExecuteCommandIfEnabled(iter->second);
}

void PanelView::OnWidgetDestroying(views::Widget* widget) {
  window_ = NULL;
}

void PanelView::OnWidgetActivationChanged(views::Widget* widget, bool active) {
#if defined(OS_WIN)
  // WM_NCACTIVATED could be sent when an active window is being destroyed on
  // Windows. We need to guard against this.
  if (window_closed_)
    return;

  bool focused = active;
  if (chrome::GetActiveDesktop() == chrome::HOST_DESKTOP_TYPE_NATIVE) {
    // The panel window is in focus (actually accepting keystrokes) if it is
    // active and belongs to a foreground application.
    focused = active &&
        views::HWNDForWidget(widget) == ::GetForegroundWindow();
  }
#else
  NOTIMPLEMENTED();
  bool focused = active;
#endif

  if (focused_ == focused)
    return;
  focused_ = focused;

  // Expand the panel if the minimized panel is activated by means other than
  // clicking on its titlebar. This is the workaround to support restoring the
  // minimized panel by other means, like alt-tabbing, win-tabbing, or clicking
  // the taskbar icon. Note that this workaround does not work for one edge
  // case: the mouse happens to be at the minimized panel when the user tries to
  // bring up the panel with the above alternatives.
  // When the user clicks on the minimized panel, the panel expansion will be
  // done when we process the mouse button pressed message.
#if defined(OS_WIN)
  if (focused_ && panel_->IsMinimized() &&
      panel_->collection()->type() == PanelCollection::DOCKED &&
      gfx::Screen::GetScreenFor(widget->GetNativeWindow())->
          GetWindowUnderCursor() != widget->GetNativeWindow()) {
    panel_->Restore();
  }
#endif

  panel()->OnActiveStateChanged(focused);

   // Give web contents view a chance to set focus to the appropriate element.
  if (focused_) {
    content::WebContents* web_contents = panel_->GetWebContents();
    if (web_contents)
      web_contents->GetView()->RestoreFocus();
  }
}

void PanelView::OnWidgetBoundsChanged(views::Widget* widget,
                                      const gfx::Rect& new_bounds) {
  if (user_resizing_)
    panel()->collection()->OnPanelResizedByMouse(panel(), new_bounds);
}

bool PanelView::OnTitlebarMousePressed(const gfx::Point& mouse_location) {
  mouse_pressed_ = true;
  mouse_dragging_state_ = NO_DRAGGING;
  last_mouse_location_ = mouse_location;
  return true;
}

bool PanelView::OnTitlebarMouseDragged(const gfx::Point& mouse_location) {
  if (!mouse_pressed_)
    return false;

  if (mouse_dragging_state_ == NO_DRAGGING &&
      ExceededDragThreshold(mouse_location - last_mouse_location_)) {
    // When a drag begins, we do not want to the client area to still receive
    // the focus. We do not need to do this for the unfocused minimized panel.
    if (!panel_->IsMinimized()) {
      old_focused_view_ = GetFocusManager()->GetFocusedView();
      GetFocusManager()->SetFocusedView(GetFrameView());
    }

    panel_->manager()->StartDragging(panel_.get(), last_mouse_location_);
    mouse_dragging_state_ = DRAGGING_STARTED;
  }
  if (mouse_dragging_state_ == DRAGGING_STARTED) {
    panel_->manager()->Drag(mouse_location);

    // Once in drag, update |last_mouse_location_| on each drag fragment, since
    // we already dragged the panel up to the current mouse location.
    last_mouse_location_ = mouse_location;
  }
  return true;
}

bool PanelView::OnTitlebarMouseReleased(panel::ClickModifier modifier) {
  if (mouse_dragging_state_ != NO_DRAGGING) {
    // Ensure dragging a minimized panel does not leave it activated.
    // Windows activates a panel on mouse-down, regardless of our attempts
    // to prevent activation of a minimized panel. Now that we know mouse-down
    // resulted in a mouse-drag, we need to ensure the minimized panel is
    // deactivated.
    if (panel_->IsMinimized() && focused_)
      panel_->Deactivate();

    if (mouse_dragging_state_ == DRAGGING_STARTED) {
      // When a drag ends, restore the focus.
      if (old_focused_view_) {
        GetFocusManager()->SetFocusedView(old_focused_view_);
        old_focused_view_ = NULL;
      }
      return EndDragging(false);
    }

    // The panel drag was cancelled before the mouse is released. Do not
    // treat this as a click.
    return true;
  }

  panel_->OnTitlebarClicked(modifier);
  return true;
}

bool PanelView::OnTitlebarMouseCaptureLost() {
  if (mouse_dragging_state_ == DRAGGING_STARTED)
    return EndDragging(true);
  return true;
}

bool PanelView::EndDragging(bool cancelled) {
  // Only handle clicks that started in our window.
  if (!mouse_pressed_)
    return false;
  mouse_pressed_ = false;

  mouse_dragging_state_ = DRAGGING_ENDED;
  panel_->manager()->EndDragging(cancelled);
  return true;
}

PanelFrameView* PanelView::GetFrameView() const {
  return static_cast<PanelFrameView*>(window_->non_client_view()->frame_view());
}

bool PanelView::IsAnimatingBounds() const {
  if (bounds_animator_.get() && bounds_animator_->is_animating())
    return true;
  StackedPanelCollection* stack = panel_->stack();
  if (!stack)
    return false;
  return stack->IsAnimatingPanelBounds(panel_.get());
}

bool PanelView::IsWithinResizingArea(const gfx::Point& mouse_location) const {
  gfx::Rect bounds = window_->GetWindowBoundsInScreen();
  DCHECK(bounds.Contains(mouse_location));
  return mouse_location.x() < bounds.x() + kResizeInsideBoundsSize ||
         mouse_location.x() >= bounds.right() - kResizeInsideBoundsSize ||
         mouse_location.y() < bounds.y() + kResizeInsideBoundsSize ||
         mouse_location.y() >= bounds.bottom() - kResizeInsideBoundsSize;
}

#if defined(OS_WIN)
void PanelView::UpdateWindowAttribute(int attribute_index,
                                      int attribute_value_to_set,
                                      int attribute_value_to_reset,
                                      bool update_frame) {
  HWND native_window = views::HWNDForWidget(window_);
  int value = ::GetWindowLong(native_window, attribute_index);
  int expected_value = value;
  if (attribute_value_to_set)
    expected_value |=  attribute_value_to_set;
  if (attribute_value_to_reset)
    expected_value &=  ~attribute_value_to_reset;
  if (value != expected_value)
    ::SetWindowLong(native_window, attribute_index, expected_value);

  // Per MSDN, if any of the frame styles is changed, SetWindowPos with the
  // SWP_FRAMECHANGED flag must be called in order for the cached window data
  // to be updated properly.
  // http://msdn.microsoft.com/en-us/library/windows/desktop/ms633591(v=vs.85).aspx
  if (update_frame) {
    ::SetWindowPos(native_window, NULL, 0, 0, 0, 0,
                   SWP_FRAMECHANGED | SWP_NOMOVE | SWP_NOSIZE |
                       SWP_NOZORDER | SWP_NOACTIVATE);
  }
}
#endif
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root/chrome/browser/ui/views/panels/panel_view.cc

DEFINITIONS
