blob: 0bd9a70f8849fc0a245adac8eb8b327cb55bfeb9 [file] [log] [blame]
// 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.
#include "ui/gfx/geometry/point_f.h"
#include "ui/touch_selection/ui_touch_selection_export.h"
namespace ui {
class MotionEvent;
class TouchSelectionDraggable;
// Interface through which TouchSelectionDraggable manipulates the selection.
class UI_TOUCH_SELECTION_EXPORT TouchSelectionDraggableClient {
virtual ~TouchSelectionDraggableClient() {}
virtual void OnDragBegin(const TouchSelectionDraggable& draggable,
const gfx::PointF& start_position) = 0;
virtual void OnDragUpdate(const TouchSelectionDraggable& draggable,
const gfx::PointF& new_position) = 0;
virtual void OnDragEnd(const TouchSelectionDraggable& draggable) = 0;
virtual bool IsWithinTapSlop(const gfx::Vector2dF& delta) const = 0;
// Generic interface for entities that manipulate the selection via dragging.
class UI_TOUCH_SELECTION_EXPORT TouchSelectionDraggable {
virtual ~TouchSelectionDraggable() {}
// Offers a touch sequence to the draggable target. Returns true if the event
// was consumed, in which case the caller should cease further handling.
virtual bool WillHandleTouchEvent(const ui::MotionEvent& event) = 0;
// Whether a drag is active OR being detected for the current touch sequence.
virtual bool IsActive() const = 0;
} // namespace ui