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dragged_tab_gtk.h

// 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_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/callback.h"
#include "base/scoped_ptr.h"
#include "base/task.h"
#include "gfx/canvas.h"
#include "gfx/point.h"
#include "gfx/rect.h"
#include "gfx/size.h"

class TabContents;
class TabRendererGtk;

class DraggedTabGtk : public AnimationDelegate {
 public:
  DraggedTabGtk(TabContents* datasource,
                const gfx::Point& mouse_tab_offset,
                const gfx::Size& contents_size,
                bool mini);
  virtual ~DraggedTabGtk();

  // Moves the dragged tab to the appropriate location given the mouse
  // pointer at |screen_point|.
  void MoveTo(const gfx::Point& screen_point);

  // Sets the offset of the mouse from the upper left corner of the tab.
  void set_mouse_tab_offset(const gfx::Point& offset) {
    mouse_tab_offset_ = offset;
  }

  // Notifies the dragged tab that it has become attached to a tabstrip.
  void Attach(int selected_width);

  // Resizes the dragged tab to a width of |width|.
  void Resize(int width);

  // Notifies the dragged tab that it has been detached from a tabstrip.
  void Detach();

  // Notifies the dragged tab that it should update itself.
  void Update();

  // Animates the dragged tab 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 dragged tab. Used when attaching to a tabstrip
  // to determine where to place the tab in the attached tabstrip.
  const gfx::Size& attached_tab_size() const { return attached_tab_size_; }

  GtkWidget* widget() const { return container_; }

 private:
  // Overridden from AnimationDelegate:
  virtual void AnimationProgressed(const Animation* animation);
  virtual void AnimationEnded(const Animation* animation);
  virtual void AnimationCanceled(const Animation* animation);

  // Arranges the contents of the dragged tab.
  void Layout();

  // Gets the preferred size of the dragged tab.
  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);

  // Returns the bounds of the container window.
  gfx::Rect bounds() const;

  // Sets the color map of the container window to allow the window to be
  // transparent.
  void SetContainerColorMap();

  // Sets full transparency for the container window.  This is used if
  // compositing is available for the screen.
  void SetContainerTransparency();

  // Sets the shape mask for the container window to emulate a transparent
  // container window.  This is used if compositing is not available for the
  // screen.
  // |surface| represents the tab only (not the render view).
  void SetContainerShapeMask(cairo_surface_t* surface);

  // expose-event handler that notifies when the tab needs to be redrawn.
  static gboolean OnExposeEvent(GtkWidget* widget, GdkEventExpose* event,
                                DraggedTabGtk* dragged_tab);

  // The tab contents that the dragged tab contains.
  TabContents* data_source_;

  // The window that contains the dragged tab or tab contents.
  GtkWidget* container_;

  // The fixed widget that we use to contain the tab renderer so that the
  // tab widget won't be resized.
  GtkWidget* fixed_;

  // 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 size of the tab renderer when the dragged tab 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 tab 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_

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