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- // Copyright 2019 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_ACCESSIBILITY_AUTOCLICK_AUTOCLICK_SCROLL_POSITION_HANDLER_H_
- #define ASH_ACCESSIBILITY_AUTOCLICK_AUTOCLICK_SCROLL_POSITION_HANDLER_H_
- #include <memory>
- #include "base/time/time.h"
- #include "base/timer/timer.h"
- #include "ui/gfx/animation/animation_delegate.h"
- #include "ui/gfx/animation/linear_animation.h"
- #include "ui/gfx/native_widget_types.h"
- namespace gfx {
- class Point;
- } // namespace gfx
- namespace views {
- class Widget;
- } // namespace views
- namespace ash {
- // AutoclickScrollPositionHandler displays the position at which the next scroll
- // event will occur, giving users a sense of which part of the screen will
- // receive scroll events. It will display at full opacity for a short time, then
- // partially fade out to keep from blocking content.
- class AutoclickScrollPositionHandler : public gfx::AnimationDelegate {
- public:
- explicit AutoclickScrollPositionHandler(
- std::unique_ptr<views::Widget> widget);
- AutoclickScrollPositionHandler(const AutoclickScrollPositionHandler&) =
- delete;
- AutoclickScrollPositionHandler& operator=(
- const AutoclickScrollPositionHandler&) = delete;
- ~AutoclickScrollPositionHandler() override;
- gfx::NativeView GetNativeView();
- void SetScrollPointCenterInScreen(const gfx::Point& scroll_point_center);
- private:
- static constexpr auto kOpaqueTime = base::Milliseconds(500);
- static constexpr auto kFadeTime = base::Milliseconds(500);
- // gfx::AnimationDelegate:
- void AnimationProgressed(const gfx::Animation* animation) override;
- std::unique_ptr<views::Widget> widget_;
- // Animation that fades the scroll indicator from full to partial opacity.
- gfx::LinearAnimation animation_{
- kFadeTime, gfx::LinearAnimation::kDefaultFrameRate, this};
- // Timer that keeps the indicator at full opacity briefly after updating.
- base::DelayTimer timer_;
- };
- } // namespace ash
- #endif // ASH_ACCESSIBILITY_AUTOCLICK_AUTOCLICK_SCROLL_POSITION_HANDLER_H_
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