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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_WINDOW_RESIZER_H_
#define ASH_WM_WINDOW_RESIZER_H_
#include "ash/ash_export.h"
#include "ash/wm/drag_details.h"
#include "ash/wm/window_state.h"
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "ui/gfx/rect.h"
#include "ui/wm/public/window_move_client.h"
namespace aura {
class Window;
}
namespace ash {
// WindowResizer is used by ToplevelWindowEventFilter to handle dragging, moving
// or resizing a window. All coordinates passed to this are in the parent
// windows coordinates.
class ASH_EXPORT WindowResizer {
public:
// Constants to identify the type of resize.
static const int kBoundsChange_None;
static const int kBoundsChange_Repositions;
static const int kBoundsChange_Resizes;
// Used to indicate which direction the resize occurs in.
static const int kBoundsChangeDirection_None;
static const int kBoundsChangeDirection_Horizontal;
static const int kBoundsChangeDirection_Vertical;
WindowResizer();
WindowResizer(wm::WindowState* window_state);
virtual ~WindowResizer();
// Returns a bitmask of the kBoundsChange_ values.
static int GetBoundsChangeForWindowComponent(int component);
// Returns a bitmask of the kBoundsChange_ values.
static int GetPositionChangeDirectionForWindowComponent(int window_component);
// Invoked to drag/move/resize the window. |location| is in the coordinates
// of the window supplied to the constructor. |event_flags| is the event
// flags from the event.
virtual void Drag(const gfx::Point& location, int event_flags) = 0;
// Invoked to complete the drag.
virtual void CompleteDrag() = 0;
// Reverts the drag.
virtual void RevertDrag() = 0;
// Returns the target window the resizer was created for.
aura::Window* GetTarget() const {
return window_state_ ? window_state_->window() : NULL;
}
// See comment for |DragDetails::initial_location_in_parent|.
const gfx::Point& GetInitialLocation() const {
return window_state_->drag_details()->initial_location_in_parent;
}
// Drag parameters established when drag starts.
const DragDetails& details() const { return *window_state_->drag_details(); }
protected:
gfx::Rect CalculateBoundsForDrag(const gfx::Point& location);
static bool IsBottomEdge(int component);
// WindowState of the drag target.
wm::WindowState* window_state_;
private:
// In case of touch resizing, adjusts deltas so that the border is positioned
// just under the touch point.
void AdjustDeltaForTouchResize(int* delta_x, int* delta_y);
// Returns the new origin of the window. The arguments are the difference
// between the current location and the initial location.
gfx::Point GetOriginForDrag(int delta_x, int delta_y);
// Returns the size of the window for the drag.
gfx::Size GetSizeForDrag(int* delta_x, int* delta_y);
// Returns the width of the window.
int GetWidthForDrag(int min_width, int* delta_x);
// Returns the height of the drag.
int GetHeightForDrag(int min_height, int* delta_y);
};
// Creates a WindowResizer for |window|. This can return a scoped_ptr
// initialized with NULL if |window| should not be resized nor dragged.
ASH_EXPORT scoped_ptr<WindowResizer> CreateWindowResizer(
aura::Window* window,
const gfx::Point& point_in_parent,
int window_component,
aura::client::WindowMoveSource source);
} // namespace ash
#endif // ASH_WM_WINDOW_RESIZER_H_
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