Implement GtkFloatingContainer

chrome/browser/gtk/tab_contents_container_gtk.h

 // 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/common/notification_registrar.h"
 
 class RenderViewHost;
 class StatusBubbleGtk;
 class TabContents;
 
+typedef struct _GtkFloatingContainer GtkFloatingContainer;
+
 class TabContentsContainerGtk : public NotificationObserver {
  public:
   explicit TabContentsContainerGtk(StatusBubbleGtk* status_bubble);
   ~TabContentsContainerGtk();
 
+  void Init();
+
   // Inserts our GtkWidget* hierarchy into a GtkBox managed by our owner.
   void AddContainerToBox(GtkWidget* widget);
 
   // 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);
 
@@ skipping 19 matching lines @@
 
   // 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_;
 
-  // We keep a GtkFixed which is inserted into this object's owner's GtkWidget
-  // hierarchy. We then 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. In
-  // addition, we need to position the status bubble on top of the currently
-  // displayed TabContents so we put that in this part of the hierarchy.
+  // 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.
+  GtkWidget* 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_