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// Copyright (c) 2012 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/touch_event_queue.h"
#include "content/browser/renderer_host/render_widget_host_impl.h"
#include "content/public/browser/render_widget_host_view.h"
#include "content/port/browser/render_widget_host_view_port.h"
namespace content {
TouchEventQueue::TouchEventQueue(RenderWidgetHostImpl* host)
: render_widget_host_(host) {
}
TouchEventQueue::~TouchEventQueue() {
}
void TouchEventQueue::QueueEvent(const WebKit::WebTouchEvent& event) {
if (touch_queue_.empty()) {
// There is no touch event in the queue. Forward it to the renderer
// immediately.
touch_queue_.push_back(event);
render_widget_host_->ForwardTouchEventImmediately(event);
return;
}
// If the last queued touch-event was a touch-move, and the current event is
// also a touch-move, then the events can be coalesced into a single event.
if (!empty()) {
WebKit::WebTouchEvent& last_event = touch_queue_.back();
if (event.type == WebKit::WebInputEvent::TouchMove &&
last_event.type == WebKit::WebInputEvent::TouchMove &&
event.modifiers == last_event.modifiers &&
event.touchesLength == last_event.touchesLength) {
// The WebTouchPoints include absolute position information. So it is
// sufficient to simply replace the previous event with the new event.
touch_queue_.pop_back();
}
}
touch_queue_.push_back(event);
}
void TouchEventQueue::ProcessTouchAck(bool processed) {
PopTouchEventToView(processed);
// If there's a queued touch-event, then forward it to the renderer now.
if (!touch_queue_.empty())
render_widget_host_->ForwardTouchEventImmediately(touch_queue_.front());
}
void TouchEventQueue::FlushQueue() {
while (!touch_queue_.empty())
PopTouchEventToView(false);
}
void TouchEventQueue::Reset() {
touch_queue_.clear();
}
void TouchEventQueue::PopTouchEventToView(bool processed) {
CHECK(!touch_queue_.empty());
WebKit::WebTouchEvent acked_event = touch_queue_.front();
touch_queue_.pop_front();
// Note that acking the touch-event may result in multiple gestures being sent
// to the renderer.
RenderWidgetHostViewPort* view = RenderWidgetHostViewPort::FromRWHV(
render_widget_host_->GetView());
view->ProcessAckedTouchEvent(acked_event, processed);
}
} // namespace content
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