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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_PANELS_PANEL_WINDOW_RESIZER_H_
#define ASH_WM_PANELS_PANEL_WINDOW_RESIZER_H_
#include "ash/wm/window_resizer.h"
#include "base/compiler_specific.h"
#include "base/memory/weak_ptr.h"
namespace gfx {
class Rect;
class Point;
}
namespace ash {
// PanelWindowResizer is used by ToplevelWindowEventFilter to handle dragging,
// moving or resizing panel window. These can be attached and detached from the
// launcher.
class ASH_EXPORT PanelWindowResizer : public WindowResizer {
public:
virtual ~PanelWindowResizer();
// Creates a new PanelWindowResizer. 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 PanelWindowResizer* 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:
// Creates PanelWindowResizer that adds the ability to attach / detach panel
// windows as well as reparenting them to the panel layer while dragging to
// |next_window_resizer|. This object takes ownership of
// |next_window_resizer|.
PanelWindowResizer(WindowResizer* next_window_resizer,
const Details& details);
// Checks if the provided window bounds should attach to the launcher. If true
// the offset gives the necessary adjustment to snap to the launcher.
bool AttachToLauncher(const gfx::Rect& bounds, gfx::Point* offset);
// Tracks the panel's initial position and attachment at the start of a drag
// and informs the PanelLayoutManager that a drag has started if necessary.
void StartedDragging();
// Informs the PanelLayoutManager that the drag is complete if it was informed
// of the drag start.
void FinishDragging();
// Updates the dragged panel's index in the launcher.
void UpdateLauncherPosition();
const Details details_;
// Last pointer location in screen coordinates.
gfx::Point last_location_;
// Wraps a window resizer and adds panel detaching / reattaching and snapping
// to launcher behavior during drags.
scoped_ptr<WindowResizer> next_window_resizer_;
// Panel container window.
aura::Window* panel_container_;
aura::Window* initial_panel_container_;
// Set to true once Drag() is invoked and the bounds of the window change.
bool did_move_or_resize_;
// True if the window started attached to the launcher.
const bool was_attached_;
// True if the window should attach to the launcher after releasing.
bool should_attach_;
base::WeakPtrFactory<PanelWindowResizer> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(PanelWindowResizer);
};
} // namespace ash
#endif // ASH_WM_PANELS_PANEL_WINDOW_RESIZER_H_