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// Copyright 2013 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 "content/renderer/input/input_handler_manager.h"
#include "base/bind.h"
#include "base/location.h"
#include "base/single_thread_task_runner.h"
#include "base/thread_task_runner_handle.h"
#include "base/trace_event/trace_event.h"
#include "cc/input/input_handler.h"
#include "components/scheduler/renderer/renderer_scheduler.h"
#include "content/renderer/input/input_event_filter.h"
#include "content/renderer/input/input_handler_manager_client.h"
#include "content/renderer/input/input_handler_wrapper.h"
#include "content/renderer/input/input_scroll_elasticity_controller.h"
using blink::WebInputEvent;
using scheduler::RendererScheduler;
namespace content {
namespace {
InputEventAckState InputEventDispositionToAck(
InputHandlerProxy::EventDisposition disposition) {
switch (disposition) {
case InputHandlerProxy::DID_HANDLE:
return INPUT_EVENT_ACK_STATE_CONSUMED;
case InputHandlerProxy::DID_NOT_HANDLE:
return INPUT_EVENT_ACK_STATE_NOT_CONSUMED;
case InputHandlerProxy::DROP_EVENT:
return INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS;
}
NOTREACHED();
return INPUT_EVENT_ACK_STATE_UNKNOWN;
}
} // namespace
InputHandlerManager::InputHandlerManager(
const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
InputHandlerManagerClient* client,
scheduler::RendererScheduler* renderer_scheduler)
: task_runner_(task_runner),
client_(client),
renderer_scheduler_(renderer_scheduler) {
DCHECK(client_);
client_->SetBoundHandler(base::Bind(&InputHandlerManager::HandleInputEvent,
base::Unretained(this)));
}
InputHandlerManager::~InputHandlerManager() {
client_->SetBoundHandler(InputHandlerManagerClient::Handler());
}
void InputHandlerManager::AddInputHandler(
int routing_id,
const base::WeakPtr<cc::InputHandler>& input_handler,
const base::WeakPtr<RenderViewImpl>& render_view_impl) {
if (task_runner_->BelongsToCurrentThread()) {
AddInputHandlerOnCompositorThread(routing_id,
base::ThreadTaskRunnerHandle::Get(),
input_handler, render_view_impl);
} else {
task_runner_->PostTask(
FROM_HERE,
base::Bind(&InputHandlerManager::AddInputHandlerOnCompositorThread,
base::Unretained(this), routing_id,
base::ThreadTaskRunnerHandle::Get(), input_handler,
render_view_impl));
}
}
void InputHandlerManager::AddInputHandlerOnCompositorThread(
int routing_id,
const scoped_refptr<base::SingleThreadTaskRunner>& main_task_runner,
const base::WeakPtr<cc::InputHandler>& input_handler,
const base::WeakPtr<RenderViewImpl>& render_view_impl) {
DCHECK(task_runner_->BelongsToCurrentThread());
// The handler could be gone by this point if the compositor has shut down.
if (!input_handler)
return;
// The same handler may be registered for a route multiple times.
if (input_handlers_.count(routing_id) != 0)
return;
TRACE_EVENT1("input",
"InputHandlerManager::AddInputHandlerOnCompositorThread",
"result", "AddingRoute");
scoped_ptr<InputHandlerWrapper> wrapper(new InputHandlerWrapper(
this, routing_id, main_task_runner, input_handler, render_view_impl));
client_->DidAddInputHandler(routing_id, input_handler.get(),
wrapper->input_handler_proxy());
input_handlers_.add(routing_id, wrapper.Pass());
}
void InputHandlerManager::RemoveInputHandler(int routing_id) {
DCHECK(task_runner_->BelongsToCurrentThread());
DCHECK(input_handlers_.contains(routing_id));
TRACE_EVENT0("input", "InputHandlerManager::RemoveInputHandler");
client_->DidRemoveInputHandler(routing_id);
input_handlers_.erase(routing_id);
}
void InputHandlerManager::ObserveWheelEventAndResultOnMainThread(
int routing_id,
const blink::WebMouseWheelEvent& wheel_event,
const cc::InputHandlerScrollResult& scroll_result) {
task_runner_->PostTask(
FROM_HERE,
base::Bind(
&InputHandlerManager::ObserveWheelEventAndResultOnCompositorThread,
base::Unretained(this), routing_id, wheel_event, scroll_result));
}
void InputHandlerManager::ObserveWheelEventAndResultOnCompositorThread(
int routing_id,
const blink::WebMouseWheelEvent& wheel_event,
const cc::InputHandlerScrollResult& scroll_result) {
auto it = input_handlers_.find(routing_id);
if (it == input_handlers_.end())
return;
InputHandlerProxy* proxy = it->second->input_handler_proxy();
DCHECK(proxy->scroll_elasticity_controller());
proxy->scroll_elasticity_controller()->ObserveWheelEventAndResult(
wheel_event, scroll_result);
}
InputEventAckState InputHandlerManager::HandleInputEvent(
int routing_id,
const WebInputEvent* input_event,
ui::LatencyInfo* latency_info) {
DCHECK(task_runner_->BelongsToCurrentThread());
auto it = input_handlers_.find(routing_id);
if (it == input_handlers_.end()) {
TRACE_EVENT1("input", "InputHandlerManager::HandleInputEvent",
"result", "NoInputHandlerFound");
// Oops, we no longer have an interested input handler..
return INPUT_EVENT_ACK_STATE_NOT_CONSUMED;
}
InputHandlerProxy* proxy = it->second->input_handler_proxy();
InputEventAckState input_event_ack_state = InputEventDispositionToAck(
proxy->HandleInputEventWithLatencyInfo(*input_event, latency_info));
switch (input_event_ack_state) {
case INPUT_EVENT_ACK_STATE_CONSUMED:
renderer_scheduler_->DidHandleInputEventOnCompositorThread(
*input_event,
RendererScheduler::InputEventState::EVENT_CONSUMED_BY_COMPOSITOR);
break;
case INPUT_EVENT_ACK_STATE_NOT_CONSUMED:
renderer_scheduler_->DidHandleInputEventOnCompositorThread(
*input_event,
RendererScheduler::InputEventState::EVENT_FORWARDED_TO_MAIN_THREAD);
break;
default:
break;
}
return input_event_ack_state;
}
void InputHandlerManager::DidOverscroll(int routing_id,
const DidOverscrollParams& params) {
client_->DidOverscroll(routing_id, params);
}
void InputHandlerManager::DidStopFlinging(int routing_id) {
client_->DidStopFlinging(routing_id);
}
void InputHandlerManager::DidAnimateForInput() {
renderer_scheduler_->DidAnimateForInputOnCompositorThread();
}
} // namespace content
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