// 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_UTIL_H_
#define ASH_WM_WINDOW_UTIL_H_

#include "ash/ash_export.h"
#include "base/compiler_specific.h"
#include "ui/base/ui_base_types.h"

namespace aura {
class RootWindow;
class Window;
}

namespace gfx {
class Rect;
}

namespace ui {
class Event;
class Layer;
}

namespace ash {
// We force at least this many DIPs for any window on the screen.
const int kMinimumOnScreenArea = 10;

namespace wm {

// Convenience setters/getters for |aura::client::kRootWindowActiveWindow|.
ASH_EXPORT void ActivateWindow(aura::Window* window);
ASH_EXPORT void DeactivateWindow(aura::Window* window);
ASH_EXPORT bool IsActiveWindow(aura::Window* window);
ASH_EXPORT aura::Window* GetActiveWindow();
ASH_EXPORT bool CanActivateWindow(aura::Window* window);

// Retrieves the activatable window for |window|. If |window| is activatable,
// this will just return it, otherwise it will climb the parent/transient parent
// chain looking for a window that is activatable, per the ActivationController.
// If you're looking for a function to get the activatable "top level" window,
// this is probably what you're looking for.
ASH_EXPORT aura::Window* GetActivatableWindow(aura::Window* window);

// Returns true if |window| can be maximized.
ASH_EXPORT bool CanMaximizeWindow(const aura::Window* window);

// Returns true if |window| can be minimized.
ASH_EXPORT bool CanMinimizeWindow(const aura::Window* window);

// Returns true if |window| can be resized.
ASH_EXPORT bool CanResizeWindow(const aura::Window* window);

// Returns true if |window| can be snapped to the left or right.
ASH_EXPORT bool CanSnapWindow(aura::Window* window);

// Returns true if |window| is normal or default.
ASH_EXPORT bool IsWindowNormal(const aura::Window* window);

// Returns true if |state| is normal or default.
ASH_EXPORT bool IsWindowStateNormal(const ui::WindowShowState state);

// Returns true if |window| is in the maximized state.
ASH_EXPORT bool IsWindowMaximized(const aura::Window* window);

// Returns true if |window| is minimized.
ASH_EXPORT bool IsWindowMinimized(const aura::Window* window);

// Returns true if |window| is in the fullscreen state.
ASH_EXPORT bool IsWindowFullscreen(const aura::Window* window);

// Maximizes |window|, which must not be NULL.
ASH_EXPORT void MaximizeWindow(aura::Window* window);

// Minimizes |window|, which must not be NULL.
ASH_EXPORT void MinimizeWindow(aura::Window* window);

// Restores |window|, which must not be NULL.
ASH_EXPORT void RestoreWindow(aura::Window* window);

// Maximizes or restores |window| based on its state. |window| must not be NULL.
ASH_EXPORT void ToggleMaximizedWindow(aura::Window* window);

// Moves the window to the center of the display.
ASH_EXPORT void CenterWindow(aura::Window* window);

// Returns true if |window|'s position can automatically be managed.
ASH_EXPORT bool IsWindowPositionManaged(const aura::Window* window);

// Change the |window|'s position manageability to |managed|.
ASH_EXPORT void SetWindowPositionManaged(aura::Window* window, bool managed);

// Returns true if the user has changed the |window|'s position or size.
ASH_EXPORT bool HasUserChangedWindowPositionOrSize(const aura::Window* window);

// Marks a |window|'s coordinates to be changed by a user.
ASH_EXPORT void SetUserHasChangedWindowPositionOrSize(aura::Window* window,
                                                      bool changed);

// Get |window| bounds of the window before it was moved by the auto window
// management. As long as it was not managed, it will return NULL.
ASH_EXPORT const gfx::Rect* GetPreAutoManageWindowBounds(
    const aura::Window* window);

// Remember the |bounds| of a |window| before an automated window management
// operation takes place.
ASH_EXPORT void SetPreAutoManageWindowBounds(aura::Window* window,
                                             const gfx::Rect& bounds);

// Move the given bounds inside the given work area, including a safety margin
// given by |kMinimumOnScreenArea|.
ASH_EXPORT void AdjustBoundsToEnsureMinimumWindowVisibility(
    const gfx::Rect& work_area,
    gfx::Rect* bounds);

// Move the given bounds inside the given work area, including a safety margin
// given by |min_width| and |min_height|.
ASH_EXPORT void AdjustBoundsToEnsureWindowVisibility(
    const gfx::Rect& work_area,
    int min_width,
    int min_height,
    gfx::Rect* bounds);

// Moves |window| to the root window where the |event| occured if it is not
// already in the same root window. Returns true if |window| was moved.
ASH_EXPORT bool MoveWindowToEventRoot(aura::Window* window,
                                      const ui::Event& event);

}  // namespace wm
}  // namespace ash

#endif  // ASH_WM_WINDOW_UTIL_H_