// 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.

#ifndef CHROME_BROWSER_UI_PANELS_PANEL_BROWSER_FRAME_VIEW_H_
#define CHROME_BROWSER_UI_PANELS_PANEL_BROWSER_FRAME_VIEW_H_
#pragma once

#include "base/gtest_prod_util.h"
#include "base/memory/scoped_ptr.h"
#include "base/message_loop.h"
#include "chrome/browser/ui/views/frame/browser_non_client_frame_view.h"
#include "chrome/browser/ui/views/tab_icon_view.h"
#include "ui/base/animation/animation_delegate.h"
#include "ui/views/controls/button/button.h"
#include "ui/views/controls/button/menu_button_listener.h"

class Extension;
class PanelBrowserView;
class PanelSettingsMenuModel;
class SkPaint;
namespace gfx {
class Font;
}
namespace ui {
class LinearAnimation;
}
namespace views {
class ImageButton;
class Label;
class MenuButton;
class MenuItemView;
class MenuModelAdapter;
class MenuRunner;
}

class PanelBrowserFrameView : public BrowserNonClientFrameView,
                              public views::ButtonListener,
                              public views::MenuButtonListener,
                              public TabIconView::TabIconViewModel,
                              public ui::AnimationDelegate {
 public:
  PanelBrowserFrameView(BrowserFrame* frame, PanelBrowserView* browser_view);
  virtual ~PanelBrowserFrameView();

  void UpdateTitleBar();
  void OnFocusChanged(bool focused);

  // Returns the height of the entire nonclient top border, including the window
  // frame, any title area, and any connected client edge.
  int NonClientTopBorderHeight() const;

  // Returns the size of the non-client area, that is, the window size minus
  // the size of the client area.
  gfx::Size NonClientAreaSize() const;

  // Returns the size of the non-client area upon which only the title icon
  // is drawn.
  gfx::Size IconOnlySize() const;

 protected:
  // Overridden from BrowserNonClientFrameView:
  virtual gfx::Rect GetBoundsForTabStrip(views::View* tabstrip) const OVERRIDE;
  virtual int GetHorizontalTabStripVerticalOffset(bool restored) const OVERRIDE;
  virtual void UpdateThrobber(bool running) OVERRIDE;

  // Overridden from views::NonClientFrameView:
  virtual gfx::Rect GetBoundsForClientView() const OVERRIDE;
  virtual gfx::Rect GetWindowBoundsForClientBounds(
      const gfx::Rect& client_bounds) const OVERRIDE;
  virtual int NonClientHitTest(const gfx::Point& point) OVERRIDE;
  virtual void GetWindowMask(const gfx::Size& size, gfx::Path* window_mask)
      OVERRIDE;
  virtual void ResetWindowControls() OVERRIDE;
  virtual void UpdateWindowIcon() OVERRIDE;

  // Overridden from views::View:
  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
  virtual void OnThemeChanged() OVERRIDE;
  virtual gfx::Size GetMinimumSize() OVERRIDE;
  virtual gfx::Size GetMaximumSize() OVERRIDE;
  virtual void Layout() OVERRIDE;
  virtual void GetAccessibleState(ui::AccessibleViewState* state) OVERRIDE;
  virtual bool OnMousePressed(const views::MouseEvent& event) OVERRIDE;
  virtual bool OnMouseDragged(const views::MouseEvent& event) OVERRIDE;
  virtual void OnMouseReleased(const views::MouseEvent& event) OVERRIDE;
  virtual void OnMouseCaptureLost() OVERRIDE;

  // Overridden from views::ButtonListener:
  virtual void ButtonPressed(views::Button* sender, const views::Event& event)
      OVERRIDE;

  // Overridden from views::MenuButtonListener:
  virtual void OnMenuButtonClicked(views::View* source,
                                   const gfx::Point& point) OVERRIDE;

  // Overridden from TabIconView::TabIconViewModel:
  virtual bool ShouldTabIconViewAnimate() const OVERRIDE;
  virtual SkBitmap GetFaviconForTabIconView() OVERRIDE;

  // Overridden from AnimationDelegate:
  virtual void AnimationEnded(const ui::Animation* animation) OVERRIDE;
  virtual void AnimationProgressed(const ui::Animation* animation) OVERRIDE;
  virtual void AnimationCanceled(const ui::Animation* animation) OVERRIDE;

 private:
  friend class PanelBrowserViewTest;
  friend class NativePanelTestingWin;

  enum PaintState {
    NOT_PAINTED,
    PAINT_AS_INACTIVE,
    PAINT_AS_ACTIVE,
    PAINT_FOR_ATTENTION
  };

  class MouseWatcher : public MessageLoopForUI::Observer {
   public:
    explicit MouseWatcher(PanelBrowserFrameView* view);
    virtual ~MouseWatcher();

    virtual bool IsCursorInViewBounds() const;

  #if defined(OS_WIN) || defined(USE_AURA)
    virtual base::EventStatus WillProcessEvent(
        const base::NativeEvent& event) OVERRIDE;
    virtual void DidProcessEvent(const base::NativeEvent& event) OVERRIDE;
  #elif defined(TOOLKIT_USES_GTK)
    virtual void WillProcessEvent(GdkEvent* event) OVERRIDE;
    virtual void DidProcessEvent(GdkEvent* event) OVERRIDE;
  #endif

   private:
    void HandleGlobalMouseMoveEvent();

    PanelBrowserFrameView* view_;
    bool is_mouse_within_;

    DISALLOW_COPY_AND_ASSIGN(MouseWatcher);
  };

  // Returns the thickness of the entire nonclient left, right, and bottom
  // borders, including both the window frame and any client edge.
  int NonClientBorderThickness() const;

  // Returns the width of the panel that is showing only an icon.
  int IconOnlyWidth() const;

  // Update control styles to indicate if the titlebar is active or not.
  void UpdateControlStyles(PaintState paint_state);

  // Custom draw the frame.
  void PaintFrameBorder(gfx::Canvas* canvas);
  void PaintClientEdge(gfx::Canvas* canvas);

  // Called by MouseWatcher to notify if the mouse enters or leaves the window.
  void OnMouseEnterOrLeaveWindow(bool mouse_entered);

  // Retrieves the drawing metrics based on the current painting state.
  SkColor GetDefaultTitleColor(PaintState paint_state) const;
  SkColor GetTitleColor(PaintState paint_state) const;
  const SkPaint& GetDefaultFrameTheme(PaintState paint_state) const;
  SkColor GetFrameColor(PaintState paint_state) const;
  SkBitmap* GetFrameTheme(PaintState paint_state) const;

  // Make settings button visible if either of the conditions is met:
  // 1) The panel is active, i.e. having focus.
  // 2) The mouse is over the panel.
  void UpdateSettingsButtonVisibility(bool active, bool cursor_in_view);

  bool UsingDefaultTheme() const;

  const Extension* GetExtension() const;

  bool EnsureSettingsMenuCreated();

  string16 GetTitleText() const;

  bool CanResize() const;

#ifdef UNIT_TEST
  PanelSettingsMenuModel* settings_menu_model() const {
    return settings_menu_model_.get();
  }

  void set_mouse_watcher(MouseWatcher* mouse_watcher) {
    mouse_watcher_.reset(mouse_watcher);
  }
#endif

  // The client view hosted within this non-client frame view that is
  // guaranteed to be freed before the client view.
  // (see comments about view hierarchies in non_client_view.h)
  PanelBrowserView* panel_browser_view_;

  PaintState paint_state_;
  views::MenuButton* settings_button_;
  views::ImageButton* close_button_;
  TabIconView* title_icon_;
  views::Label* title_label_;
  gfx::Rect client_view_bounds_;
  scoped_ptr<MouseWatcher> mouse_watcher_;
  scoped_ptr<PanelSettingsMenuModel> settings_menu_model_;
  scoped_ptr<views::MenuModelAdapter> settings_menu_adapter_;
  views::MenuItemView* settings_menu_;  // Owned by |settings_menu_runner_|.
  scoped_ptr<views::MenuRunner> settings_menu_runner_;

  // Used to animate the visibility change of settings button.
  scoped_ptr<ui::LinearAnimation> settings_button_animator_;
  gfx::Rect settings_button_full_bounds_;
  gfx::Rect settings_button_zero_bounds_;
  bool is_settings_button_visible_;

  // On Aura popups are displayed in panels. If this panel is not opened by an
  // app, it won't have a settings button.
  const bool has_settings_button_;

  DISALLOW_COPY_AND_ASSIGN(PanelBrowserFrameView);
};

#endif  // CHROME_BROWSER_UI_PANELS_PANEL_BROWSER_FRAME_VIEW_H_