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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_EVENTS_BLINK_SYNCHRONOUS_INPUT_HANDLER_PROXY_H_
#define UI_EVENTS_BLINK_SYNCHRONOUS_INPUT_HANDLER_PROXY_H_
#include "base/time/time.h"
namespace gfx {
class ScrollOffset;
class SizeF;
}
namespace ui {
class SynchronousInputHandler {
public:
virtual ~SynchronousInputHandler() {}
// Informs the Android WebView embedder that a fling animation is running, and
// that it should call SynchronouslyAnimate() if it wants to execute that
// animation. The embedder/app may choose to override and ignore the
// request for animation.
virtual void SetNeedsSynchronousAnimateInput() = 0;
// Informs the Android WebView embedder of the current root scroll and page
// scale state.
virtual void UpdateRootLayerState(
const gfx::ScrollOffset& total_scroll_offset,
const gfx::ScrollOffset& max_scroll_offset,
const gfx::SizeF& scrollable_size,
float page_scale_factor,
float min_page_scale_factor,
float max_page_scale_factor) = 0;
};
// Android WebView requires synchronous scrolling from the WebView application.
// This interface provides support for that behaviour. The WebView embedder will
// act as the InputHandler for controlling the timing of input (fling)
// animations.
class SynchronousInputHandlerProxy {
public:
virtual ~SynchronousInputHandlerProxy() {}
// Tell the proxy that we will control the timing of root fling animations
// from the SynchronousInputHandler. Once this is set, the InputHandler is
// not requested to Animate() the InputHandlerProxy for root layer flings.
// Instead, requests for animation will go to the SynchronousInputHandler and
// animation ticks will only come back through SynchronouslyAnimate().
// Non-root flings are not affected.
virtual void SetOnlySynchronouslyAnimateRootFlings(
SynchronousInputHandler* synchronous_input_handler) = 0;
// Tick input (fling) animations. This may happen out of phase with the frame
// timing, or not at all, as it is controlled by the WebView application. When
// it returns, it expects the animation scroll offsets to be visible to the
// application.
virtual void SynchronouslyAnimate(base::TimeTicks time) = 0;
// Called when the synchronous input handler wants to change the root scroll
// offset. Since it has the final say, this overrides values from compositor-
// controlled behaviour. After the offset is applied, the
// SynchronousInputHandler should be given back the result in case it differs
// from what was sent.
virtual void SynchronouslySetRootScrollOffset(
const gfx::ScrollOffset& root_offset) = 0;
};
} // namespace ui
#endif // UI_EVENTS_BLINK_SYNCHRONOUS_INPUT_HANDLER_PROXY_H_
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