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// Copyright 2014 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_STICKY_KEYS_STICKY_KEYS_OVERLAY_H_
#define ASH_STICKY_KEYS_STICKY_KEYS_OVERLAY_H_
#include "ash/ash_export.h"
#include "ash/sticky_keys/sticky_keys_state.h"
#include "base/memory/scoped_ptr.h"
#include "ui/compositor/layer_animation_observer.h"
#include "ui/events/event_constants.h"
#include "ui/gfx/geometry/size.h"
namespace gfx {
class Rect;
}
namespace views {
class Widget;
}
namespace ash {
class StickyKeysOverlayView;
// Controls the overlay UI for sticky keys, an accessibility feature allowing
// use of modifier keys without holding them down. This overlay will appear as
// a transparent window on the top left of the screen, showing the state of
// each sticky key modifier.
class ASH_EXPORT StickyKeysOverlay : public ui::LayerAnimationObserver {
public:
StickyKeysOverlay();
virtual ~StickyKeysOverlay();
// Shows or hides the overlay.
void Show(bool visible);
void SetModifierVisible(ui::EventFlags modifier, bool visible);
bool GetModifierVisible(ui::EventFlags modifier);
// Updates the overlay with the current state of a sticky key modifier.
void SetModifierKeyState(ui::EventFlags modifier,
StickyKeyState state);
// Get the current state of the sticky key modifier in the overlay.
StickyKeyState GetModifierKeyState(ui::EventFlags modifier);
// Returns true if the overlay is currently visible. If the overlay is
// animating, the returned value is the target of the animation.
bool is_visible() { return is_visible_; }
private:
// Returns the current bounds of the overlay, which is based on visibility.
gfx::Rect CalculateOverlayBounds();
// gfx::LayerAnimationObserver overrides:
virtual void OnLayerAnimationEnded(
ui::LayerAnimationSequence* sequence) override;
virtual void OnLayerAnimationAborted(
ui::LayerAnimationSequence* sequence) override;
virtual void OnLayerAnimationScheduled(
ui::LayerAnimationSequence* sequence) override;
bool is_visible_;
scoped_ptr<views::Widget> overlay_widget_;
// Ownership of |overlay_view_| is passed to the view heirarchy.
StickyKeysOverlayView* overlay_view_;
gfx::Size widget_size_;
};
} // namespace ash
#endif // ASH_STICKY_KEYS_STICKY_KEYS_OVERLAY_H_
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