// Copyright (c) 2009 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_GTK_TAB_CONTENTS_CONTAINER_GTK_H_
#define CHROME_BROWSER_GTK_TAB_CONTENTS_CONTAINER_GTK_H_

#include <gtk/gtk.h>

#include "base/basictypes.h"
#include "chrome/browser/gtk/view_id_util.h"
#include "chrome/common/notification_registrar.h"
#include "chrome/common/owned_widget_gtk.h"

class RenderViewHost;
class StatusBubbleGtk;
class TabContents;

typedef struct _GtkFloatingContainer GtkFloatingContainer;

class TabContentsContainerGtk : public NotificationObserver,
                                public ViewIDUtil::Delegate {
 public:
  explicit TabContentsContainerGtk(StatusBubbleGtk* status_bubble);
  ~TabContentsContainerGtk();

  void Init();

  // Make the specified tab visible.
  void SetTabContents(TabContents* tab_contents);
  TabContents* GetTabContents() const { return tab_contents_; }

  // Remove the tab from the hierarchy.
  void DetachTabContents(TabContents* tab_contents);

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

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

  // ViewIDUtil::Delegate implementation ---------------------------------------
  virtual GtkWidget* GetWidgetForViewID(ViewID id);

 private:
  // Add or remove observers for events that we care about.
  void AddObservers();
  void RemoveObservers();

  // Called when the RenderViewHost of the hosted TabContents has changed, e.g.
  // to show an interstitial page.
  void RenderViewHostChanged(RenderViewHost* old_host,
                             RenderViewHost* new_host);

  // Called when a TabContents is destroyed. This gives us a chance to clean
  // up our internal state if the TabContents is somehow destroyed before we
  // get notified.
  void TabContentsDestroyed(TabContents* contents);

  // Implements our hack around a GtkFixed. The entire size of the GtkFixed is
  // allocated to normal tab contents views, while the status bubble is
  // informed of its parent and its parent's allocation (it makes a decision
  // about layout later.)
  static void OnFixedSizeAllocate(
      GtkWidget* fixed,
      GtkAllocation* allocation,
      TabContentsContainerGtk* container);

  // Handler for |floating_|'s "set-floating-position" signal. During this
  // callback, we manually set the position of the status bubble.
  static void OnSetFloatingPosition(
      GtkFloatingContainer* container, GtkAllocation* allocation,
      TabContentsContainerGtk* tab_contents_container);

  NotificationRegistrar registrar_;

  // The currently visible TabContents.
  TabContents* tab_contents_;

  // The status bubble manager.  Always non-NULL.
  StatusBubbleGtk* status_bubble_;

  // Top of the TabContentsContainerGtk widget hierarchy. A cross between a
  // GtkBin and a GtkFixed, |floating_| has |fixed_| as its one "real" child,
  // and the various things that hang off the bottom (status bubble, etc) have
  // their positions manually set in OnSetFloatingPosition.
  OwnedWidgetGtk floating_;

  // We insert and remove TabContents GtkWidgets into this fixed_. This should
  // not be a GtkVBox since there were errors with timing where the vbox was
  // horizontally split with the top half displaying the current TabContents
  // and bottom half displaying the loading page.
  GtkWidget* fixed_;

  DISALLOW_COPY_AND_ASSIGN(TabContentsContainerGtk);
};

#endif  // CHROME_BROWSER_GTK_TAB_CONTENTS_CONTAINER_GTK_H_