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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/media/web_contents_tracker.h"
#include "base/message_loop/message_loop_proxy.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/render_process_host.h"
#include "content/public/browser/render_view_host.h"
#include "content/public/browser/web_contents.h"
namespace content {
WebContentsTracker::WebContentsTracker() {}
WebContentsTracker::~WebContentsTracker() {
DCHECK(!web_contents()) << "BUG: Still observering!";
}
void WebContentsTracker::Start(int render_process_id, int render_view_id,
const ChangeCallback& callback) {
DCHECK(!message_loop_.get() || message_loop_->BelongsToCurrentThread());
message_loop_ = base::MessageLoopProxy::current();
DCHECK(message_loop_.get());
callback_ = callback;
BrowserThread::PostTask(
BrowserThread::UI, FROM_HERE,
base::Bind(&WebContentsTracker::LookUpAndObserveWebContents, this,
render_process_id, render_view_id));
}
void WebContentsTracker::Stop() {
DCHECK(message_loop_->BelongsToCurrentThread());
callback_.Reset();
BrowserThread::PostTask(
BrowserThread::UI, FROM_HERE,
base::Bind(&WebContentsTracker::Observe, this,
static_cast<WebContents*>(NULL)));
}
void WebContentsTracker::OnWebContentsChangeEvent() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
WebContents* const wc = web_contents();
RenderViewHost* const rvh = wc ? wc->GetRenderViewHost() : NULL;
RenderProcessHost* const rph = rvh ? rvh->GetProcess() : NULL;
const int render_process_id = rph ? rph->GetID() : MSG_ROUTING_NONE;
const int render_view_id = rvh ? rvh->GetRoutingID() : MSG_ROUTING_NONE;
message_loop_->PostTask(FROM_HERE,
base::Bind(&WebContentsTracker::MaybeDoCallback, this,
render_process_id, render_view_id));
}
void WebContentsTracker::MaybeDoCallback(int render_process_id,
int render_view_id) {
DCHECK(message_loop_->BelongsToCurrentThread());
if (!callback_.is_null())
callback_.Run(render_process_id, render_view_id);
}
void WebContentsTracker::LookUpAndObserveWebContents(int render_process_id,
int render_view_id) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
RenderViewHost* const rvh =
RenderViewHost::FromID(render_process_id, render_view_id);
DVLOG_IF(1, !rvh) << "RenderViewHost::FromID("
<< render_process_id << ", " << render_view_id
<< ") returned NULL.";
Observe(rvh ? WebContents::FromRenderViewHost(rvh) : NULL);
DVLOG_IF(1, !web_contents())
<< "WebContents::FromRenderViewHost(" << rvh << ") returned NULL.";
OnWebContentsChangeEvent();
}
void WebContentsTracker::RenderViewReady() {
OnWebContentsChangeEvent();
}
void WebContentsTracker::AboutToNavigateRenderView(RenderViewHost* rvh) {
OnWebContentsChangeEvent();
}
void WebContentsTracker::DidNavigateMainFrame(
const LoadCommittedDetails& details, const FrameNavigateParams& params) {
OnWebContentsChangeEvent();
}
void WebContentsTracker::WebContentsDestroyed(WebContents* web_contents) {
OnWebContentsChangeEvent();
}
} // namespace content
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