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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/renderer/load_progress_tracker.h"
#include "base/bind.h"
#include "base/message_loop/message_loop.h"
#include "content/common/view_messages.h"
#include "content/renderer/render_view_impl.h"
namespace content {
namespace {
const int kMinimumDelayBetweenUpdatesMS = 100;
// This matches what blink's ProgrssTracker has traditionally used for a
// minimum progress value.
const double kMinimumProgress = 0.1;
}
LoadProgressTracker::LoadProgressTracker(RenderViewImpl* render_view)
: render_view_(render_view),
total_progress_(0.0),
weak_factory_(this) {
}
LoadProgressTracker::~LoadProgressTracker() {
}
void LoadProgressTracker::DidStartLoading(int frame_routing_id) {
progresses_[frame_routing_id] = kMinimumProgress;
SendChangeLoadProgress();
}
void LoadProgressTracker::DidStopLoading(int frame_routing_id) {
if (progresses_.find(frame_routing_id) == progresses_.end())
return;
// Load stopped while we were still tracking load. Make sure we update
// progress based on this frame's completion.
progresses_[frame_routing_id] = 1.0;
SendChangeLoadProgress();
// Then we clean-up our states.
if (total_progress_ == 1.0)
ResetStates();
}
void LoadProgressTracker::DidChangeLoadProgress(int frame_routing_id,
double progress) {
progresses_[frame_routing_id] = 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.
base::TimeDelta min_delay =
base::TimeDelta::FromMilliseconds(kMinimumDelayBetweenUpdatesMS);
if (progress == 1.0 || last_time_progress_sent_.is_null() ||
base::TimeTicks::Now() - last_time_progress_sent_ > min_delay) {
// If there is a pending task to send progress, it is now obsolete.
weak_factory_.InvalidateWeakPtrs();
SendChangeLoadProgress();
if (total_progress_ == 1.0)
ResetStates();
return;
}
if (weak_factory_.HasWeakPtrs())
return;
base::MessageLoop::current()->PostDelayedTask(
FROM_HERE,
base::Bind(&LoadProgressTracker::SendChangeLoadProgress,
weak_factory_.GetWeakPtr()),
min_delay);
}
void LoadProgressTracker::SendChangeLoadProgress() {
last_time_progress_sent_ = base::TimeTicks::Now();
double progress = 0.0;
unsigned frameCount = 0;
ProgressMap::iterator end = progresses_.end();
for (ProgressMap::iterator it = progresses_.begin(); it != end; ++it) {
progress += it->second;
frameCount++;
}
if (frameCount == 0)
return;
progress /= frameCount;
DCHECK(progress <= 1.0);
if (progress <= total_progress_)
return;
total_progress_ = progress;
render_view_->Send(
new ViewHostMsg_DidChangeLoadProgress(render_view_->routing_id(),
progress));
}
void LoadProgressTracker::ResetStates() {
progresses_.clear();
total_progress_ = 0.0;
weak_factory_.InvalidateWeakPtrs();
last_time_progress_sent_ = base::TimeTicks();
}
} // namespace content
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