Implement DraggedTabGtk, the object that handles rendering either a dragged t...

chrome/browser/gtk/tabs/dragged_tab_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_TABS_DRAGGED_TAB_GTK_H_
+#define CHROME_BROWSER_GTK_TABS_DRAGGED_TAB_GTK_H_
+
+#include <gtk/gtk.h>
+
+#include "app/slide_animation.h"
+#include "base/gfx/point.h"
+#include "base/gfx/rect.h"
+#include "base/gfx/size.h"
+#include "base/scoped_ptr.h"
+#include "base/task.h"
+#include "chrome/common/owned_widget_gtk.h"
+
+class ChromeCanvas;
+class TabContents;
+class TabRendererGtk;
+
+class DraggedTabGtk : public AnimationDelegate {
+ public:
+  DraggedTabGtk(TabContents* datasource,
+                const gfx::Point& mouse_tab_offset,
+                const gfx::Size& contents_size);
+  virtual ~DraggedTabGtk();
+
+  // Moves the DraggedTabView to the appropriate location given the mouse
+  // pointer at |screen_point|.
+  void MoveTo(const gfx::Point& screen_point);
+
+  // Notifies the DraggedTabView that it has become attached to a TabStrip.
+  void Attach(int selected_width);
+
+  // Notifies the DraggedTabView that it should update itself.
+  void Update();
+
+  // Animates the DraggedTabView to the specified bounds, then calls back to
+  // |callback|.
+  typedef Callback0::Type AnimateToBoundsCallback;
+  void AnimateToBounds(const gfx::Rect& bounds,
+                       AnimateToBoundsCallback* callback);
+
+  // Returns the size of the DraggedTabView. Used when attaching to a TabStrip
+  // to determine where to place the Tab in the attached TabStrip.
+  gfx::Size attached_tab_size() const { return attached_tab_size_; }
+
+ private:
+  // Overridden from AnimationDelegate:
+  virtual void AnimationProgressed(const Animation* animation);
+  virtual void AnimationEnded(const Animation* animation);
+  virtual void AnimationCanceled(const Animation* animation);
+
+  // Gets the preferred size of the dragged tab.
+  virtual gfx::Size GetPreferredSize();
+
+  // Resizes the container to fit the content for the current attachment mode.
+  void ResizeContainer();
+
+  // Utility for scaling a size by the current scaling factor.
+  int ScaleValue(int value);
+
+  // Sets the color map of the container window to allow the window to be
+  // transparent.
+  void SetContainerColorMap();
+
+  // expose-event handler that redraws the dragged tab.
+  static gboolean OnExpose(GtkWidget* widget, GdkEventExpose* event,
+                           DraggedTabGtk* dragged_tab);
+
+  // The window that contains the dragged tab or tab contents.
+  OwnedWidgetGtk container_;
+
+  // The renderer that paints the dragged tab.
+  scoped_ptr<TabRendererGtk> renderer_;
+
+  // True if the view is currently attached to a TabStrip. Controls rendering
+  // and sizing modes.
+  bool attached_;
+
+  // The unscaled offset of the mouse from the top left of the dragged Tab.
+  // This is used to maintain an appropriate offset for the mouse pointer when
+  // dragging scaled and unscaled representations, and also to calculate the
+  // position of detached windows.
+  gfx::Point mouse_tab_offset_;
+
+  // The desired width of the TabRenderer when the DraggedTabView is attached
+  // to a TabStrip.
+  gfx::Size attached_tab_size_;
+
+  // The dimensions of the TabContents being dragged.
+  gfx::Size contents_size_;
+
+  // The animation used to slide the attached view to its final location.
+  SlideAnimation close_animation_;
+
+  // A callback notified when the animation is complete.
+  scoped_ptr<Callback0::Type> animation_callback_;
+
+  // The start and end bounds of the animation sequence.
+  gfx::Rect animation_start_bounds_;
+  gfx::Rect animation_end_bounds_;
+
+  DISALLOW_COPY_AND_ASSIGN(DraggedTabGtk);
+};
+
+#endif  // CHROME_BROWSER_GTK_TABS_DRAGGED_TAB_GTK_H_