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// Copyright 2013 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_SELECTOR_H_
#define ASH_WM_WINDOW_SELECTOR_H_
#include <vector>
#include "base/compiler_specific.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/scoped_vector.h"
#include "ui/aura/window_observer.h"
#include "ui/base/events/event_handler.h"
#include "ui/gfx/transform.h"
namespace aura {
class RootWindow;
}
namespace ui {
class LocatedEvent;
}
namespace views {
class Widget;
}
namespace ash {
class WindowSelectorDelegate;
class WindowSelectorWindow;
// The WindowSelector shows a grid of all of your windows and allows selecting
// a window by clicking or tapping on it (OVERVIEW mode) or by alt-tabbing to
// it (CYCLE mode).
class WindowSelector : public ui::EventHandler,
public aura::WindowObserver {
public:
enum Direction {
FORWARD,
BACKWARD
};
enum Mode {
CYCLE,
OVERVIEW
};
typedef std::vector<aura::Window*> WindowList;
WindowSelector(const WindowList& windows,
Mode mode,
WindowSelectorDelegate* delegate);
virtual ~WindowSelector();
// Step to the next window in |direction|.
void Step(Direction direction);
// Select the current window.
void SelectWindow();
Mode mode() { return mode_; }
// ui::EventHandler:
virtual void OnEvent(ui::Event* event) OVERRIDE;
virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
virtual void OnTouchEvent(ui::TouchEvent* event) OVERRIDE;
// aura::WindowObserver:
virtual void OnWindowDestroyed(aura::Window* window) OVERRIDE;
private:
// Returns the target of |event| or NULL if the event is not targeted at
// any of the windows in the selector.
WindowSelectorWindow* GetEventTarget(ui::LocatedEvent* event);
// Handles a selection event for |target|.
void HandleSelectionEvent(WindowSelectorWindow* target);
// Position all of the windows based on the current selection mode.
void PositionWindows();
// Position all of the windows from |root_window| on |root_window|.
void PositionWindowsFromRoot(aura::RootWindow* root_window);
// Position all of the |windows| to fit on the |root_window|.
void PositionWindowsOnRoot(aura::RootWindow* root_window,
const std::vector<WindowSelectorWindow*>& windows);
void InitializeSelectionWidget();
// Updates the selection widget's location to the currently selected window.
// If |animate| the transition to the new location is animated.
void UpdateSelectionLocation(bool animate);
// The collection of windows in the overview wrapped by a helper class which
// restores their state and helps transform them to other root windows.
ScopedVector<WindowSelectorWindow> windows_;
// The window selection mode.
Mode mode_;
// Weak pointer to the selector delegate which will be called when a
// selection is made.
WindowSelectorDelegate* delegate_;
// Index of the currently selected window if the mode is CYCLE.
size_t selected_window_;
// Widget indicating which window is currently selected.
scoped_ptr<views::Widget> selection_widget_;
// In CYCLE mode, the root window in which selection is taking place.
// NULL otherwise.
aura::RootWindow* selection_root_;
DISALLOW_COPY_AND_ASSIGN(WindowSelector);
};
} // namespace ash
#endif // ASH_WM_WINDOW_SELECTOR_H_
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