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// Copyright 2020 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_ACCESSIBILITY_SWITCH_ACCESS_POINT_SCAN_CONTROLLER_H_
#define ASH_ACCESSIBILITY_SWITCH_ACCESS_POINT_SCAN_CONTROLLER_H_
#include <optional>
#include "ash/accessibility/switch_access/point_scan_layer_animation_info.h"
#include "ash/accessibility/ui/accessibility_animation_one_shot.h"
#include "ash/accessibility/ui/accessibility_layer.h"
#include "ash/ash_export.h"
#include "ui/gfx/geometry/point_f.h"
namespace ash {
class PointScanLayer;
// PointScanController handles drawing and animating custom lines onscreen, for
// the purposes of selecting a point onscreen without using a traditional mouse
// or keyboard. Currently used by Switch Access.
class ASH_EXPORT PointScanController : public AccessibilityLayerDelegate {
public:
PointScanController();
~PointScanController() override;
PointScanController(const PointScanController&) = delete;
PointScanController& operator=(const PointScanController&) = delete;
enum class PointScanState {
// Point scanning is not scanning.
kOff,
// Point scanning is currently range scanning horizontally.
kHorizontalRangeScanning,
// Point scanning is currently scanning horizontally.
kHorizontalScanning,
// Point scanning is currently range scanning vertically.
kVerticalRangeScanning,
// Point scanning is currently scanning vertically.
kVerticalScanning,
};
// Starts point scanning, by sweeping a range across the screen and waiting
// for user input.
void Start();
void StartHorizontalRangeScan();
void StartHorizontalLineScan();
void StartVerticalRangeScan();
void StartVerticalLineScan();
void Stop();
void HideAll();
void ResetAnimation();
std::optional<gfx::PointF> OnPointSelect();
bool IsPointScanEnabled();
void SetSpeedDipsPerSecond(int speed_dips_per_second);
private:
// AccessibilityLayerDelegate implementation:
void OnDeviceScaleFactorChanged() override;
void UpdateTimeInfo(PointScanLayerAnimationInfo* animation_info,
base::TimeTicks timestamp);
bool AnimateLine(base::TimeTicks timestamp);
PointScanLayerAnimationInfo horizontal_range_layer_info_;
std::unique_ptr<PointScanLayer> horizontal_range_layer_;
PointScanLayerAnimationInfo horizontal_line_layer_info_;
std::unique_ptr<PointScanLayer> horizontal_line_layer_;
PointScanLayerAnimationInfo vertical_range_layer_info_;
std::unique_ptr<PointScanLayer> vertical_range_layer_;
PointScanLayerAnimationInfo vertical_line_layer_info_;
std::unique_ptr<PointScanLayer> vertical_line_layer_;
std::unique_ptr<AccessibilityAnimationOneShot> point_scan_animation_;
PointScanState state_ = PointScanState::kOff;
};
} // namespace ash
#endif // ASH_ACCESSIBILITY_SWITCH_ACCESS_POINT_SCAN_CONTROLLER_H_
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