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/*
* Copyright (C) 2006, 2007, 2009, 2010, 2011 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_PAGE_AUTOSCROLL_CONTROLLER_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_PAGE_AUTOSCROLL_CONTROLLER_H_
#include "base/gtest_prod_util.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/layout/geometry/physical_offset.h"
#include "third_party/blink/renderer/platform/geometry/float_point.h"
#include "third_party/blink/renderer/platform/geometry/float_size.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
namespace blink {
class LocalFrame;
class Node;
class Page;
class LayoutBox;
class LayoutObject;
enum AutoscrollType {
kNoAutoscroll,
kAutoscrollForDragAndDrop,
kAutoscrollForSelection,
kAutoscrollForMiddleClick,
};
enum MiddleClickMode {
// Middle button was just pressed but was neither released nor moved out of
// the deadzone yet.
kMiddleClickInitial,
// Mouse was moved out of the deadzone while still holding middle mouse
// button. In this mode, we'll stop autoscrolling when it's released.
kMiddleClickHolding,
// Middle button was released while still in the deadzone. In this mode,
// we'll stop autoscrolling when any button is clicked.
kMiddleClickToggled,
};
// AutscrollController handels autoscroll and middle click autoscroll for
// EventHandler.
class CORE_EXPORT AutoscrollController final
: public GarbageCollected<AutoscrollController> {
public:
explicit AutoscrollController(Page&);
void Trace(Visitor*) const;
// Selection and drag-and-drop autoscroll.
void Animate();
bool SelectionAutoscrollInProgress() const;
bool AutoscrollInProgressFor(const LayoutBox*) const;
bool AutoscrollInProgress() const;
void StartAutoscrollForSelection(LayoutObject*);
void StopAutoscroll();
void StopAutoscrollIfNeeded(LayoutObject*);
void UpdateAutoscrollLayoutObject();
void UpdateDragAndDrop(Node* target_node,
const FloatPoint& event_position,
base::TimeTicks event_time);
// Middle-click autoscroll.
void StartMiddleClickAutoscroll(LocalFrame*,
LayoutBox* scrollable,
const FloatPoint& position,
const FloatPoint& position_global);
void HandleMouseMoveForMiddleClickAutoscroll(
LocalFrame*,
const FloatPoint& position_global,
bool is_middle_button);
void HandleMouseReleaseForMiddleClickAutoscroll(LocalFrame*,
bool is_middle_button);
void StopMiddleClickAutoscroll(LocalFrame*);
bool MiddleClickAutoscrollInProgress() const;
private:
// For test.
bool IsAutoscrolling() const;
Member<Page> page_;
AutoscrollType autoscroll_type_ = kNoAutoscroll;
// Selection and drag-and-drop autoscroll.
void ScheduleMainThreadAnimation();
LayoutBox* autoscroll_layout_object_ = nullptr;
LayoutBox* pressed_layout_object_ = nullptr;
PhysicalOffset drag_and_drop_autoscroll_reference_position_;
base::TimeTicks drag_and_drop_autoscroll_start_time_;
// Middle-click autoscroll.
LayoutBox* horizontal_autoscroll_layout_box_ = nullptr;
LayoutBox* vertical_autoscroll_layout_box_ = nullptr;
FloatPoint middle_click_autoscroll_start_pos_global_;
gfx::Vector2dF last_velocity_;
MiddleClickMode middle_click_mode_ = kMiddleClickInitial;
FRIEND_TEST_ALL_PREFIXES(AutoscrollControllerTest,
CrashWhenLayoutStopAnimationBeforeScheduleAnimation);
FRIEND_TEST_ALL_PREFIXES(AutoscrollControllerTest,
ContinueAutoscrollAfterMouseLeaveEvent);
FRIEND_TEST_ALL_PREFIXES(AutoscrollControllerTest, StopAutoscrollOnResize);
FRIEND_TEST_ALL_PREFIXES(AutoscrollControllerTest, AutoscrollIsNotPropagated);
FRIEND_TEST_ALL_PREFIXES(AutoscrollControllerTest,
AutoscrollIsPropagatedInYDirection);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_PAGE_AUTOSCROLL_CONTROLLER_H_
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