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- // Copyright 2014 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 CC_INPUT_SCROLL_ELASTICITY_HELPER_H_
- #define CC_INPUT_SCROLL_ELASTICITY_HELPER_H_
- #include "cc/cc_export.h"
- #include "ui/gfx/geometry/point_f.h"
- #include "ui/gfx/geometry/size.h"
- #include "ui/gfx/geometry/vector2d_f.h"
- namespace cc {
- class LayerTreeHostImpl;
- // ScrollElasticityHelper is based on
- // WebKit/Source/platform/mac/ScrollElasticityController.h
- /*
- * Copyright (C) 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 INC. AND ITS CONTRIBUTORS ``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 INC. OR ITS 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.
- */
- // Interface between a LayerTreeHostImpl and the ScrollElasticityController. It
- // would be possible, in principle, for LayerTreeHostImpl to implement this
- // interface itself. This artificial boundary is introduced to reduce the amount
- // of logic and state held directly inside LayerTreeHostImpl.
- class CC_EXPORT ScrollElasticityHelper {
- public:
- static ScrollElasticityHelper* CreateForLayerTreeHostImpl(
- LayerTreeHostImpl* host_impl);
- virtual ~ScrollElasticityHelper() {}
- virtual bool IsUserScrollableHorizontal() const = 0;
- virtual bool IsUserScrollableVertical() const = 0;
- // The bounds of the root scroller.
- virtual gfx::Size ScrollBounds() const = 0;
- // The amount that the view is stretched past the normal allowable bounds.
- virtual gfx::Vector2dF StretchAmount() const = 0;
- virtual void SetStretchAmount(const gfx::Vector2dF& stretch_amount) = 0;
- // Functions for the scrolling of the root scroll layer.
- virtual gfx::PointF ScrollOffset() const = 0;
- virtual gfx::PointF MaxScrollOffset() const = 0;
- virtual void ScrollBy(const gfx::Vector2dF& delta) = 0;
- // Requests that another frame happens for the controller to continue ticking
- // animations.
- virtual void RequestOneBeginFrame() = 0;
- };
- } // namespace cc
- #endif // CC_INPUT_SCROLL_ELASTICITY_HELPER_H_
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