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// Copyright (c) 2010 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 "chrome/renderer/load_progress_tracker.h"
#include "base/message_loop.h"
#include "chrome/renderer/render_view.h"
namespace {
const int kMinimumDelayBetweenUpdatesMS = 100;
}
LoadProgressTracker::LoadProgressTracker(RenderView* render_view)
: render_view_(render_view),
tracked_frame_(NULL),
progress_(0.0),
ALLOW_THIS_IN_INITIALIZER_LIST(method_factory_(this)) {
}
LoadProgressTracker::~LoadProgressTracker() {
}
void LoadProgressTracker::DidStopLoading() {
if (!tracked_frame_)
return;
// Load stoped while we were still tracking load. Make sure we notify the
// browser that load is complete.
progress_ = 1.0;
SendChangeLoadProgress();
// Then we clean-up our states.
ResetStates();
}
void LoadProgressTracker::DidChangeLoadProgress(WebKit::WebFrame* frame,
double progress) {
if (tracked_frame_ && frame != tracked_frame_)
return;
if (!tracked_frame_)
tracked_frame_ = frame;
progress_ = progress;
// We send the progress change to the browser immediately for the first and
// last updates. Also, since the message loop may be pretty busy when a page
// is loaded, it might not execute a posted task in a timely manner so we make
// sure to immediately send progress report if enough time has passed.
if (progress == 1.0 || last_time_progress_sent_.is_null() ||
(base::TimeTicks::Now() - last_time_progress_sent_).InMilliseconds() >
kMinimumDelayBetweenUpdatesMS) {
// If there is a pending task to send progress, it is now obsolete.
method_factory_.RevokeAll();
SendChangeLoadProgress();
if (progress == 1.0)
ResetStates();
return;
}
if (!method_factory_.empty())
return;
MessageLoop::current()->PostDelayedTask(
FROM_HERE,
method_factory_.NewRunnableMethod(
&LoadProgressTracker::SendChangeLoadProgress),
kMinimumDelayBetweenUpdatesMS);
}
void LoadProgressTracker::SendChangeLoadProgress() {
last_time_progress_sent_ = base::TimeTicks::Now();
render_view_->Send(
new ViewHostMsg_DidChangeLoadProgress(render_view_->routing_id(),
progress_));
}
void LoadProgressTracker::ResetStates() {
tracked_frame_ = NULL;
progress_ = 0.0;
method_factory_.RevokeAll();
last_time_progress_sent_ = base::TimeTicks();
}
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