// 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.

#ifndef CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_VIEW_GTK_H_
#define CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_VIEW_GTK_H_

#include <gtk/gtk.h>

#include "base/scoped_ptr.h"
#include "chrome/browser/gtk/focus_store_gtk.h"
#include "chrome/browser/tab_contents/tab_contents_view.h"
#include "chrome/common/notification_observer.h"
#include "chrome/common/notification_registrar.h"
#include "chrome/common/owned_widget_gtk.h"

class ConstrainedWindowGtk;
class GtkThemeProperties;
class RenderViewContextMenuGtk;
class SadTabGtk;
class TabContentsDragSource;
class WebDragDestGtk;
typedef struct _GtkFloatingContainer GtkFloatingContainer;

class TabContentsViewGtk : public TabContentsView,
                           public NotificationObserver {
 public:
  // The corresponding TabContents is passed in the constructor, and manages our
  // lifetime. This doesn't need to be the case, but is this way currently
  // because that's what was easiest when they were split.
  explicit TabContentsViewGtk(TabContents* tab_contents);
  virtual ~TabContentsViewGtk();

  // Unlike Windows, ConstrainedWindows need to collaborate with the
  // TabContentsViewGtk to position the dialogs.
  void AttachConstrainedWindow(ConstrainedWindowGtk* constrained_window);
  void RemoveConstrainedWindow(ConstrainedWindowGtk* constrained_window);

  // TabContentsView implementation --------------------------------------------

  virtual void CreateView(const gfx::Size& initial_size);
  virtual RenderWidgetHostView* CreateViewForWidget(
      RenderWidgetHost* render_widget_host);

  virtual gfx::NativeView GetNativeView() const;
  virtual gfx::NativeView GetContentNativeView() const;
  virtual gfx::NativeWindow GetTopLevelNativeWindow() const;
  virtual void GetContainerBounds(gfx::Rect* out) const;
  virtual void SetPageTitle(const std::wstring& title);
  virtual void OnTabCrashed();
  virtual void SizeContents(const gfx::Size& size);
  virtual void Focus();
  virtual void SetInitialFocus();
  virtual void StoreFocus();
  virtual void RestoreFocus();

  // Backend implementation of RenderViewHostDelegate::View.
  virtual void ShowContextMenu(const ContextMenuParams& params);
  virtual void StartDragging(const WebDropData& drop_data,
                             WebKit::WebDragOperationsMask allowed_ops);
  virtual void UpdateDragCursor(WebKit::WebDragOperation operation);
  virtual void GotFocus();
  virtual void TakeFocus(bool reverse);

  // NotificationObserver implementation ---------------------------------------

  virtual void Observe(NotificationType type,
                       const NotificationSource& source,
                       const NotificationDetails& details);

 private:
  // Insert the given widget into the content area. Should only be used for
  // web pages and the like (including interstitials and sad tab). Note that
  // this will be perfectly happy to insert overlapping render views, so care
  // should be taken that the correct one is hidden/shown.
  void InsertIntoContentArea(GtkWidget* widget);

  void CancelDragIfAny();

  // We keep track of the timestamp of the latest mousedown event.
  static gboolean OnMouseDown(GtkWidget* widget,
                              GdkEventButton* event, TabContentsViewGtk* view);

  // Used to adjust the size of its children when the size of |expanded_| is
  // changed.
  static void OnChildSizeRequest(GtkWidget* widget,
                                 GtkWidget* child,
                                 GtkRequisition* requisition,
                                 TabContentsViewGtk* view);

  // Used to propagate the size change of |expanded_| to our RWHV to resize the
  // renderer content.
  static void OnSizeAllocate(GtkWidget* widget,
                             GtkAllocation* allocation,
                             TabContentsViewGtk* view);

  static void OnSetFloatingPosition(
      GtkFloatingContainer* floating_container, GtkAllocation* allocation,
      TabContentsViewGtk* tab_contents_view);

  // Contains |expanded_| as its GtkBin member.
  OwnedWidgetGtk floating_;

  // This container holds the tab's web page views. It is a GtkExpandedContainer
  // so that we can control the size of the web pages.
  GtkWidget* expanded_;

  // The context menu is reset every time we show it, but we keep a pointer to
  // between uses so that it won't go out of scope before we're done with it.
  scoped_ptr<RenderViewContextMenuGtk> context_menu_;

  // The event for the last mouse down we handled. We need this for context
  // menus and drags.
  GdkEventButton last_mouse_down_;

  // Used to get notifications about renderers coming and going.
  NotificationRegistrar registrar_;

  scoped_ptr<SadTabGtk> sad_tab_;

  FocusStoreGtk focus_store_;

  // The UI for the constrained dialog currently displayed. This is owned by
  // TabContents, not the view.
  ConstrainedWindowGtk* constrained_window_;

  // The helper object that handles drag destination related interactions with
  // GTK.
  scoped_ptr<WebDragDestGtk> drag_dest_;

  // Object responsible for handling drags from the page for us.
  scoped_ptr<TabContentsDragSource> drag_source_;

  // The size we want the tab contents view to be.  We keep this in a separate
  // variable because resizing in GTK+ is async.
  gfx::Size requested_size_;

  DISALLOW_COPY_AND_ASSIGN(TabContentsViewGtk);
};

#endif  // CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_VIEW_GTK_H_