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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_ACCELERATORS_MAGNIFIER_KEY_SCROLLER_H_
#define ASH_ACCELERATORS_MAGNIFIER_KEY_SCROLLER_H_
#include "ash/accelerators/key_hold_detector.h"
#include "ash/ash_export.h"
#include "base/memory/scoped_ptr.h"
#include "ui/events/event_handler.h"
namespace ui {
class KeyEvent;
}
namespace ash {
// A KeyHoldDetector delegate to control control magnified screen.
class ASH_EXPORT MagnifierKeyScroller : public KeyHoldDetector::Delegate {
public:
static bool IsEnabled();
static void SetEnabled(bool enabled);
static scoped_ptr<ui::EventHandler> CreateHandler();
// A scoped object to enable and disable the magnifier accelerator for test.
class ScopedEnablerForTest {
public:
ScopedEnablerForTest() {
SetEnabled(true);
}
~ScopedEnablerForTest() {
SetEnabled(false);
}
private:
DISALLOW_COPY_AND_ASSIGN(ScopedEnablerForTest);
};
private:
// KeyHoldDetector overrides:
virtual bool ShouldProcessEvent(const ui::KeyEvent* event) const override;
virtual bool IsStartEvent(const ui::KeyEvent* event) const override;
virtual void OnKeyHold(const ui::KeyEvent* event) override;
virtual void OnKeyUnhold(const ui::KeyEvent* event) override;
MagnifierKeyScroller();
virtual ~MagnifierKeyScroller();
DISALLOW_COPY_AND_ASSIGN(MagnifierKeyScroller);
};
} // namespace ash
#endif // ASH_ACCELERATORS_MAGNIFIER_KEY_SCROLLER_H_
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