chromium/third_party/blink/renderer/platform/widget/input/input_handler_proxy.h

// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_WIDGET_INPUT_INPUT_HANDLER_PROXY_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_WIDGET_INPUT_INPUT_HANDLER_PROXY_H_

#include <memory>

#include "base/memory/raw_ptr.h"
#include "base/time/time.h"
#include "base/types/optional_ref.h"
#include "cc/input/browser_controls_offset_tags_info.h"
#include "cc/input/browser_controls_state.h"
#include "cc/input/input_handler.h"
#include "cc/input/snap_fling_controller.h"
#include "cc/paint/element_id.h"
#include "third_party/blink/public/common/input/web_coalesced_input_event.h"
#include "third_party/blink/public/common/input/web_gesture_event.h"
#include "third_party/blink/public/platform/web_common.h"
#include "third_party/blink/renderer/platform/platform_export.h"

namespace base {
class TickClock;
}

namespace cc {
class EventMetrics;
}

namespace ui {
class LatencyInfo;
}

namespace blink {
class WebInputEventAttribution;
class WebMouseWheelEvent;
class WebTouchEvent;
class ElasticOverscrollController;
}  // namespace blink

namespace blink {

namespace test {
class InputHandlerProxyTest;
class InputHandlerProxyEventQueueTest;
class InputHandlerProxyMomentumScrollJankTest;
class InputHandlerProxyForceHandlingOnMainThread;
class TestInputHandlerProxy;
class UnifiedScrollingInputHandlerProxyTest;
}  // namespace test

class CompositorThreadEventQueue;
class EventWithCallback;
class InputHandlerProxyClient;
class ScrollPredictor;
class CursorControlHandler;

class SynchronousInputHandler { … };

// This class is a proxy between the blink web input events for a WebWidget and
// the compositor's input handling logic. InputHandlerProxy instances live
// entirely on the compositor thread if one exists; however, it can exist on
// the main thread in web tests where only a single thread is used.
// Each InputHandler instance handles input events intended for a specific
// WebWidget.
//
// Android WebView requires synchronous scrolling from the WebView application.
// This class provides support for that behaviour. The WebView embedder will
// act as the InputHandler for controlling the timing of input (fling)
// animations.
class PLATFORM_EXPORT InputHandlerProxy : public cc::InputHandlerClient,
                                          public cc::SnapFlingClient { … };

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_WIDGET_INPUT_INPUT_HANDLER_PROXY_H_