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// Copyright (c) 2012 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 ASH_WM_DRAG_WINDOW_CONTROLLER_H_
#define ASH_WM_DRAG_WINDOW_CONTROLLER_H_
#include "ash/ash_export.h"
#include "base/basictypes.h"
#include "base/gtest_prod_util.h"
#include "base/memory/scoped_ptr.h"
#include "ui/gfx/display.h"
#include "ui/gfx/rect.h"
namespace aura {
class Window;
}
namespace ui {
class Layer;
}
namespace views {
class Widget;
}
namespace ash {
namespace internal {
// DragWindowController is responsible for showing a semi-transparent window
// while dragging a window across displays.
class ASH_EXPORT DragWindowController {
public:
explicit DragWindowController(aura::Window* window);
virtual ~DragWindowController();
// Sets the display where the window is placed after the window is dropped.
void SetDestinationDisplay(const gfx::Display& dst_display);
// Shows the drag window at the specified location (coordinates of the
// parent). If |layer| is non-NULL, it is shown on top of the drag window.
// |layer| is owned by the caller.
// This does not immediately show the window.
void Show();
// Hides the drag window.
void Hide();
// This is used to set bounds for the drag window immediately. This should
// be called only when the drag window is already visible.
void SetBounds(const gfx::Rect& bounds);
// Sets the opacity of the drag window.
void SetOpacity(float opacity);
private:
FRIEND_TEST_ALL_PREFIXES(DragWindowResizerTest, DragWindowController);
// Creates and shows the |drag_widget_| at |bounds|.
// |layer| is shown on top of the drag window if it is non-NULL.
// |layer| is not owned by this object.
void CreateDragWidget(const gfx::Rect& bounds);
// Sets bounds of the drag window. The window is shown on |dst_display_|
// if its id() is valid. Otherwise, a display nearest to |bounds| is chosen.
void SetBoundsInternal(const gfx::Rect& bounds);
// Recreates a fresh layer for |window_| and all its child windows.
void RecreateWindowLayers();
// Window the drag window is placed beneath.
aura::Window* window_;
// The display where the drag is placed. When dst_display_.id() is
// kInvalidDisplayID (i.e. the default), a display nearest to the current
// |bounds_| is automatically used.
gfx::Display dst_display_;
// Initially the bounds of |window_|. Each time Show() is invoked
// |start_bounds_| is then reset to the bounds of |drag_widget_| and
// |bounds_| is set to the value passed into Show(). The animation animates
// between these two values.
gfx::Rect bounds_;
views::Widget* drag_widget_;
// The copy of window_->layer() and its children. This object is the owner of
// the layer.
ui::Layer* layer_;
DISALLOW_COPY_AND_ASSIGN(DragWindowController);
};
} // namespace internal
} // namespace ash
#endif // ASH_WM_DRAG_WINDOW_CONTROLLER_H_
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