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// Copyright 2015 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 UI_TOUCH_SELECTION_LONGPRESS_DRAG_SELECTOR_H_
#define UI_TOUCH_SELECTION_LONGPRESS_DRAG_SELECTOR_H_
#include "base/time/time.h"
#include "ui/gfx/geometry/point_f.h"
#include "ui/gfx/geometry/vector2d_f.h"
#include "ui/touch_selection/touch_selection_draggable.h"
#include "ui/touch_selection/ui_touch_selection_export.h"
namespace ui {
class MotionEvent;
class UI_TOUCH_SELECTION_EXPORT LongPressDragSelectorClient
: public TouchSelectionDraggableClient {
public:
~LongPressDragSelectorClient() override {}
virtual void OnLongPressDragActiveStateChanged() = 0;
virtual gfx::PointF GetSelectionStart() const = 0;
virtual gfx::PointF GetSelectionEnd() const = 0;
};
// Supports text selection via touch dragging after a longpress-initiated
// selection.
class UI_TOUCH_SELECTION_EXPORT LongPressDragSelector
: public TouchSelectionDraggable {
public:
explicit LongPressDragSelector(LongPressDragSelectorClient* client);
~LongPressDragSelector() override;
// TouchSelectionDraggable implementation.
bool WillHandleTouchEvent(const MotionEvent& event) override;
bool IsActive() const override;
// Called just prior to a longpress event being handled.
void OnLongPressEvent(base::TimeTicks event_time,
const gfx::PointF& position);
// Called when a scroll is going to happen to cancel longpress-drag gesture.
void OnScrollBeginEvent();
// Called when the active selection changes.
void OnSelectionActivated();
void OnSelectionDeactivated();
private:
enum SelectionState {
INACTIVE,
LONGPRESS_PENDING,
SELECTION_PENDING,
DRAG_PENDING,
DRAGGING
};
void SetState(SelectionState state);
LongPressDragSelectorClient* const client_;
SelectionState state_;
base::TimeTicks touch_down_time_;
gfx::PointF touch_down_position_;
gfx::Vector2dF longpress_drag_selection_offset_;
gfx::PointF longpress_drag_start_anchor_;
bool has_longpress_drag_start_anchor_;
};
} // namespace ui
#endif // UI_TOUCH_SELECTION_LONGPRESS_DRAG_SELECTOR_H_
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