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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_RESIZER_H_
#define ASH_WM_DRAG_WINDOW_RESIZER_H_
#include "ash/wm/window_resizer.h"
#include "base/compiler_specific.h"
#include "base/gtest_prod_util.h"
#include "base/memory/weak_ptr.h"
#include "ui/gfx/point.h"
namespace ash {
namespace internal {
class DragWindowController;
class TrayUser;
// DragWindowResizer is a decorator of WindowResizer and adds the ability to
// drag windows across displays.
class ASH_EXPORT DragWindowResizer : public WindowResizer {
public:
virtual ~DragWindowResizer();
// Creates a new DragWindowResizer. The caller takes ownership of the
// returned object. The ownership of |next_window_resizer| is taken by the
// returned object. Returns NULL if not resizable.
static DragWindowResizer* Create(WindowResizer* next_window_resizer,
aura::Window* window,
const gfx::Point& location,
int window_component,
aura::client::WindowMoveSource source);
// WindowResizer:
virtual void Drag(const gfx::Point& location, int event_flags) OVERRIDE;
virtual void CompleteDrag(int event_flags) OVERRIDE;
virtual void RevertDrag() OVERRIDE;
virtual aura::Window* GetTarget() OVERRIDE;
virtual const gfx::Point& GetInitialLocation() const OVERRIDE;
private:
FRIEND_TEST_ALL_PREFIXES(DragWindowResizerTest, DragWindowController);
// Creates DragWindowResizer that adds the ability of dragging windows across
// displays to |next_window_resizer|. This object takes the ownership of
// |next_window_resizer|.
explicit DragWindowResizer(WindowResizer* next_window_resizer,
const Details& details);
// Updates the bounds of the phantom window for window dragging. Set true on
// |in_original_root| if the pointer is still in |window()->GetRootWindow()|.
void UpdateDragWindow(const gfx::Rect& bounds, bool in_original_root);
// Returns true if we should allow the mouse pointer to warp.
bool ShouldAllowMouseWarp();
// Get the user drop target underneath the given |point_in_screen| or NULL.
TrayUser* GetTrayUserItemAtPoint(const gfx::Point& point_in_screen);
// Check if a completed drag might cause the window to change active desktops.
// If the call was causing a "transfer of ownership to another desktop" and it
// will return false indicating that no further processing is needed.
bool TryDraggingToNewUser();
scoped_ptr<WindowResizer> next_window_resizer_;
// Shows a semi-transparent image of the window being dragged.
scoped_ptr<DragWindowController> drag_window_controller_;
const Details details_;
gfx::Point last_mouse_location_;
// Current instance for use by the DragWindowResizerTest.
static DragWindowResizer* instance_;
base::WeakPtrFactory<DragWindowResizer> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(DragWindowResizer);
};
} // namespace internal
} // namespace ash
#endif // ASH_WM_DRAG_WINDOW_RESIZER_H_
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