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// Copyright (c) 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/smooth_scroll_gesture_controller.h"
#include "base/debug/trace_event.h"
#include "base/message_loop.h"
#include "content/common/view_messages.h"
#include "content/port/browser/render_widget_host_view_port.h"
#include "content/port/browser/smooth_scroll_gesture.h"
#include "content/public/browser/render_widget_host.h"
namespace content {
namespace {
// How many milliseconds apart synthetic scroll messages should be sent.
const int kSyntheticScrollMessageIntervalMs = 8;
} // namespace
SmoothScrollGestureController::SmoothScrollGestureController()
: rwh_(NULL) {
}
SmoothScrollGestureController::~SmoothScrollGestureController() {
}
void SmoothScrollGestureController::BeginSmoothScroll(
RenderWidgetHostViewPort* view,
const ViewHostMsg_BeginSmoothScroll_Params& params) {
if (pending_smooth_scroll_gesture_)
return;
rwh_ = view->GetRenderWidgetHost();
pending_smooth_scroll_gesture_ = view->CreateSmoothScrollGesture(
params.scroll_down,
params.pixels_to_scroll,
params.mouse_event_x,
params.mouse_event_y);
timer_.Start(FROM_HERE, GetSyntheticScrollMessageInterval(), this,
&SmoothScrollGestureController::OnTimer);
}
base::TimeDelta
SmoothScrollGestureController::GetSyntheticScrollMessageInterval() const {
return base::TimeDelta::FromMilliseconds(kSyntheticScrollMessageIntervalMs);
}
void SmoothScrollGestureController::OnTimer() {
base::TimeTicks now = base::TimeTicks::Now();
if (!pending_smooth_scroll_gesture_->ForwardInputEvents(now, rwh_)) {
timer_.Stop();
pending_smooth_scroll_gesture_ = NULL;
rwh_->Send(new ViewMsg_SmoothScrollCompleted(rwh_->GetRoutingID()));
}
}
} // namespace content
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