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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/browser/renderer_host/input/synthetic_gesture_controller.h"
#include "base/debug/trace_event.h"
#include "content/browser/renderer_host/input/synthetic_gesture_target.h"
#include "content/common/input/synthetic_smooth_scroll_gesture_params.h"
#include "content/common/input_messages.h"
#include "content/public/browser/render_widget_host.h"
namespace content {
SyntheticGestureController::SyntheticGestureController(
scoped_ptr<SyntheticGestureTarget> gesture_target)
: gesture_target_(gesture_target.Pass()) {}
SyntheticGestureController::~SyntheticGestureController() {}
void SyntheticGestureController::QueueSyntheticGesture(
scoped_ptr<SyntheticGesture> synthetic_gesture) {
DCHECK(synthetic_gesture);
pending_gesture_queue_.push_back(synthetic_gesture.release());
// Start forwarding input events if the queue was previously empty.
if (pending_gesture_queue_.size() == 1)
StartGesture(*pending_gesture_queue_.front());
}
void SyntheticGestureController::Flush(base::TimeTicks timestamp) {
if (pending_gesture_queue_.empty())
return;
if (last_tick_time_.is_null()) {
last_tick_time_ = timestamp;
gesture_target_->SetNeedsFlush();
return;
}
base::TimeDelta interval = timestamp - last_tick_time_;
last_tick_time_ = timestamp;
SyntheticGesture::Result result =
pending_gesture_queue_.front()->ForwardInputEvents(interval,
gesture_target_.get());
if (result == SyntheticGesture::GESTURE_RUNNING) {
gesture_target_->SetNeedsFlush();
return;
}
StopGesture(*pending_gesture_queue_.front(), result);
pending_gesture_queue_.erase(pending_gesture_queue_.begin());
if (!pending_gesture_queue_.empty()) {
StartGesture(*pending_gesture_queue_.front());
} else {
// Reset last_tick_time_ so that we don't use an old value when a new
// gestures is queued.
last_tick_time_ = base::TimeTicks();
}
}
void SyntheticGestureController::StartGesture(const SyntheticGesture& gesture) {
TRACE_EVENT_ASYNC_BEGIN0("benchmark", "SyntheticGestureController::running",
&gesture);
gesture_target_->SetNeedsFlush();
}
void SyntheticGestureController::StopGesture(
const SyntheticGesture& gesture, SyntheticGesture::Result result) {
DCHECK_NE(result, SyntheticGesture::GESTURE_RUNNING);
TRACE_EVENT_ASYNC_END0("benchmark", "SyntheticGestureController::running",
&gesture);
gesture_target_->OnSyntheticGestureCompleted(result);
}
} // namespace content
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