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ash / accelerators / magnifier_key_scroller.h [blame]
// Copyright 2014 The Chromium Authors
// 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 <memory>
#include "ash/accelerators/key_hold_detector.h"
#include "ash/ash_export.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:
MagnifierKeyScroller(const MagnifierKeyScroller&) = delete;
MagnifierKeyScroller& operator=(const MagnifierKeyScroller&) = delete;
static bool IsEnabled();
static void SetEnabled(bool enabled);
static std::unique_ptr<ui::EventHandler> CreateHandler();
// A scoped object to enable and disable the magnifier accelerator for test.
class ScopedEnablerForTest {
public:
ScopedEnablerForTest() { SetEnabled(true); }
ScopedEnablerForTest(const ScopedEnablerForTest&) = delete;
ScopedEnablerForTest& operator=(const ScopedEnablerForTest&) = delete;
~ScopedEnablerForTest() { SetEnabled(false); }
};
private:
// KeyHoldDetector overrides:
bool ShouldProcessEvent(const ui::KeyEvent* event) const override;
bool IsStartEvent(const ui::KeyEvent* event) const override;
bool ShouldStopEventPropagation() const override;
void OnKeyHold(const ui::KeyEvent* event) override;
void OnKeyUnhold(const ui::KeyEvent* event) override;
MagnifierKeyScroller();
~MagnifierKeyScroller() override;
};
} // namespace ash
#endif // ASH_ACCELERATORS_MAGNIFIER_KEY_SCROLLER_H_