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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 CHROME_BROWSER_UI_ASH_WINDOW_POSITIONER_H_
#define CHROME_BROWSER_UI_ASH_WINDOW_POSITIONER_H_
#include "base/basictypes.h"
#include "ui/gfx/rect.h"
namespace aura {
class Window;
}
namespace ash {
namespace test {
class WindowPositionerTest;
}
// WindowPositioner is used by the browser to move new popups automatically to
// a usable position on the closest work area (of the active window).
class WindowPositioner {
public:
WindowPositioner();
~WindowPositioner();
// Find a suitable screen position for a popup window and return it. The
// passed input position is only used to retrieve the width and height.
// The position is determined on the left / right / top / bottom first. If
// no smart space is found, the position will follow the standard what other
// operating systems do (default cascading style).
gfx::Rect GetPopupPosition(const gfx::Rect& old_pos);
protected:
friend class test::WindowPositionerTest;
// Find a smart way to position the popup window. If there is no space this
// function will return an empty rectangle.
gfx::Rect SmartPopupPosition(const gfx::Rect& old_pos,
const gfx::Rect& work_area,
int grid);
// Find the next available cascading popup position (on the given screen).
gfx::Rect NormalPopupPosition(const gfx::Rect& old_pos,
const gfx::Rect& work_area);
// Align the location to the grid / snap to the right / bottom corner.
gfx::Rect AlignPopupPosition(const gfx::Rect &pos,
const gfx::Rect &work_area,
int grid);
// Constant exposed for unittest.
static const int kMinimumWindowOffset;
// The offset in X and Y for the next popup which opens.
int pop_position_offset_increment_x;
int pop_position_offset_increment_y;
// The position on the screen for the first popup which gets shown if no
// empty space can be found.
int popup_position_offset_from_screen_corner_x;
int popup_position_offset_from_screen_corner_y;
// The last used position.
int last_popup_position_x_;
int last_popup_position_y_;
DISALLOW_COPY_AND_ASSIGN(WindowPositioner);
};
} // namespace ash
#endif // CHROME_BROWSER_UI_ASH_WINDOW_POSITIONER_H_
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