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// Copyright (c) 2010 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 <map>
#include <string>

#include "app/gtk_signal.h"
#include "app/gtk_signal_registrar.h"
#include "app/menus/simple_menu_model.h"
#include "app/slide_animation.h"
#include "base/linked_ptr.h"
#include "base/task.h"
#include "chrome/browser/extensions/extension_toolbar_model.h"
#include "chrome/browser/gtk/custom_button.h"
#include "chrome/browser/gtk/menu_gtk.h"
#include "chrome/browser/gtk/overflow_button.h"
#include "chrome/common/notification_observer.h"
#include "chrome/common/notification_registrar.h"
#include "chrome/common/owned_widget_gtk.h"

class Browser;
class BrowserActionButton;
class Extension;
class GtkThemeProvider;
class Profile;

typedef struct _GdkDragContext GdkDragContext;
typedef struct _GtkWidget GtkWidget;

class BrowserActionsToolbarGtk : public ExtensionToolbarModel::Observer,
                                 public AnimationDelegate,
                                 public MenuGtk::Delegate,
                                 public menus::SimpleMenuModel::Delegate,
                                 public NotificationObserver {
  explicit BrowserActionsToolbarGtk(Browser* browser);
  virtual ~BrowserActionsToolbarGtk();

  GtkWidget* widget() { return hbox_.get(); }

  // Returns the widget in use by the BrowserActionButton corresponding to
  // |extension|. Used in positioning the ExtensionInstalledBubble for
  // BrowserActions.
  GtkWidget* GetBrowserActionWidget(Extension* extension);

  int button_count() { return extension_button_map_.size(); }

  Browser* browser() { return browser_; }

  // Returns the currently selected tab ID, or -1 if there is none.
  int GetCurrentTabId();

  // Update the display of all buttons.
  void Update();

  // NotificationObserver implementation.
  void Observe(NotificationType type,
               const NotificationSource& source,
               const NotificationDetails& details);

  friend class BrowserActionButton;

  // Initialize drag and drop.
  void SetupDrags();

  // Query the extensions service for all extensions with browser actions,
  // and create the UI for them.
  void CreateAllButtons();

  // Sets the width of the container and overflow state according to the model.
  void SetContainerWidth();

  // Create the UI for a single browser action. This will stick the button
  // at the end of the toolbar.
  void CreateButtonForExtension(Extension* extension, int index);

  // Delete resources associated with UI for a browser action.
  void RemoveButtonForExtension(Extension* extension);

  // Change the visibility of widget() based on whether we have any buttons
  // to show.
  void UpdateVisibility();

  // Hide the extension popup, if any.
  void HidePopup();

  // Animate the toolbar to show the given number of icons. This assumes the
  // visibility of the overflow button will not change.
  void AnimateToShowNIcons(int count);

  // Returns true if this extension should be shown in this toolbar. This can
  // return false if we are in an incognito window and the extension is disabled
  // for incognito.
  bool ShouldDisplayBrowserAction(Extension* extension);

  // ExtensionToolbarModel::Observer implementation.
  virtual void BrowserActionAdded(Extension* extension, int index);
  virtual void BrowserActionRemoved(Extension* extension);
  virtual void BrowserActionMoved(Extension* extension, int index);
  virtual void ModelLoaded();

  // AnimationDelegate implementation.
  virtual void AnimationProgressed(const Animation* animation);
  virtual void AnimationEnded(const Animation* animation);

  // SimpleMenuModel::Delegate implementation.
  // In our case, |command_id| is be the index into the model's extension list.
  virtual bool IsCommandIdChecked(int command_id) const { return false; }
  virtual bool IsCommandIdEnabled(int command_id) const { return true; }
  virtual bool GetAcceleratorForCommandId(
      int command_id,
      menus::Accelerator* accelerator) {
    return false;
  virtual void ExecuteCommand(int command_id);

  // MenuGtk::Delegate implementation.
  virtual void StoppedShowing();
  virtual bool AlwaysShowImages() const { return true; }

  // Called by the BrowserActionButton in response to drag-begin.
  void DragStarted(BrowserActionButton* button, GdkDragContext* drag_context);

  // Sets the width of the button area of the toolbar to |new_width|, clamping
  // it to appropriate values.
  void SetButtonHBoxWidth(int new_width);

  // Shows or hides the chevron as appropriate.
  void UpdateChevronVisibility();

  CHROMEGTK_CALLBACK_4(BrowserActionsToolbarGtk, gboolean, OnDragMotion,
                       GdkDragContext*, gint, gint, guint);
  CHROMEGTK_CALLBACK_1(BrowserActionsToolbarGtk, void, OnDragEnd,
  CHROMEGTK_CALLBACK_2(BrowserActionsToolbarGtk, gboolean, OnDragFailed,
                       GdkDragContext*, GtkDragResult);
  CHROMEGTK_CALLBACK_1(BrowserActionsToolbarGtk, void, OnHierarchyChanged,
  CHROMEGTK_CALLBACK_1(BrowserActionsToolbarGtk, void, OnSetFocus, GtkWidget*);
  CHROMEGTK_CALLBACK_1(BrowserActionsToolbarGtk, gboolean,
                       OnGripperMotionNotify, GdkEventMotion*);
  CHROMEGTK_CALLBACK_1(BrowserActionsToolbarGtk, gboolean, OnGripperExpose,
  CHROMEGTK_CALLBACK_1(BrowserActionsToolbarGtk, gboolean,
                       OnGripperEnterNotify, GdkEventCrossing*);
  CHROMEGTK_CALLBACK_1(BrowserActionsToolbarGtk, gboolean,
                       OnGripperLeaveNotify, GdkEventCrossing*);
  CHROMEGTK_CALLBACK_1(BrowserActionsToolbarGtk, gboolean,
                       OnGripperButtonRelease, GdkEventButton*);
  CHROMEGTK_CALLBACK_1(BrowserActionsToolbarGtk, gboolean,
                       OnGripperButtonPress, GdkEventButton*);
  // The overflow button is pressed.
  CHROMEGTK_CALLBACK_1(BrowserActionsToolbarGtk, gboolean,
                       OnOverflowButtonPress, GdkEventButton*);
  // The user presses a mouse button over the popped up overflow menu.
  CHROMEGTK_CALLBACK_1(BrowserActionsToolbarGtk, gboolean,
                       OnOverflowMenuButtonPress, GdkEventButton*);
  CHROMEGTK_CALLBACK_0(BrowserActionsToolbarGtk, void, OnButtonShowOrHide);

  Browser* browser_;

  Profile* profile_;
  GtkThemeProvider* theme_provider_;

  ExtensionToolbarModel* model_;

  // Contains the drag gripper, browser action buttons, and overflow chevron.
  OwnedWidgetGtk hbox_;

  // Contains the browser action buttons.
  OwnedWidgetGtk button_hbox_;

  // The overflow button for chrome theme mode.
  scoped_ptr<CustomDrawButton> overflow_button_;
  // The separator just next to the overflow button. Only shown in GTK+ theme
  // mode. In Chrome theme mode, the overflow button has a separator built in.
  GtkWidget* separator_;
  scoped_ptr<MenuGtk> overflow_menu_;
  scoped_ptr<menus::SimpleMenuModel> overflow_menu_model_;
  GtkWidget* overflow_area_;
  // A widget for adding extra padding to the left of the overflow button.
  GtkWidget* overflow_alignment_;

  // The button that is currently being dragged, or NULL.
  BrowserActionButton* drag_button_;

  // The new position of the button in the drag, or -1.
  int drop_index_;

  // Map from extension ID to BrowserActionButton, which is a wrapper for
  // a chrome button and related functionality. There should be one entry
  // for every extension that has a browser action.
  typedef std::map<std::string, linked_ptr<BrowserActionButton> >
  ExtensionButtonMap extension_button_map_;

  // We use this animation for the smart resizing of the toolbar.
  SlideAnimation resize_animation_;
  // This is the final width we are animating towards.
  int desired_width_;
  // This is the width we were at when we started animating.
  int start_width_;

  GtkSignalRegistrar signals_;

  NotificationRegistrar registrar_;

  ScopedRunnableMethodFactory<BrowserActionsToolbarGtk> method_factory_;



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