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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/browser/dom_ui/dom_ui_thumbnail_source.h"
#include "app/resource_bundle.h"
#include "base/callback.h"
#include "chrome/browser/profile.h"
#include "chrome/browser/history/top_sites.h"
#include "chrome/common/notification_service.h"
#include "chrome/common/url_constants.h"
#include "googleurl/src/gurl.h"
#include "grit/theme_resources.h"
DOMUIThumbnailSource::DOMUIThumbnailSource(Profile* profile)
: DataSource(chrome::kChromeUIThumbnailPath, MessageLoop::current()),
profile_(profile) {
if (history::TopSites::IsEnabled()) {
// Set TopSites now as Profile isn't thread safe.
top_sites_ = profile_->GetTopSites();
}
}
DOMUIThumbnailSource::~DOMUIThumbnailSource() {
}
void DOMUIThumbnailSource::StartDataRequest(const std::string& path,
bool is_off_the_record,
int request_id) {
if (top_sites_.get()) {
scoped_refptr<RefCountedBytes> data;
if (top_sites_->GetPageThumbnail(GURL(path), &data)) {
// We have the thumbnail.
SendResponse(request_id, data.get());
} else {
SendDefaultThumbnail(request_id);
}
return;
}
HistoryService* hs = profile_->GetHistoryService(Profile::EXPLICIT_ACCESS);
if (hs) {
HistoryService::Handle handle = hs->GetPageThumbnail(
GURL(path),
&cancelable_consumer_,
NewCallback(this, &DOMUIThumbnailSource::OnThumbnailDataAvailable));
// Attach the ChromeURLDataManager request ID to the history request.
cancelable_consumer_.SetClientData(hs, handle, request_id);
} else {
// Tell the caller that no thumbnail is available.
SendResponse(request_id, NULL);
}
}
std::string DOMUIThumbnailSource::GetMimeType(const std::string&) const {
// We need to explicitly return a mime type, otherwise if the user tries to
// drag the image they get no extension.
return "image/png";
}
MessageLoop* DOMUIThumbnailSource::MessageLoopForRequestPath(
const std::string& path) const {
// TopSites can be accessed from the IO thread.
return top_sites_.get() ? NULL : DataSource::MessageLoopForRequestPath(path);
}
void DOMUIThumbnailSource::SendDefaultThumbnail(int request_id) {
// Use placeholder thumbnail.
if (!default_thumbnail_.get()) {
default_thumbnail_ =
ResourceBundle::GetSharedInstance().LoadDataResourceBytes(
IDR_DEFAULT_THUMBNAIL);
}
SendResponse(request_id, default_thumbnail_);
}
void DOMUIThumbnailSource::OnThumbnailDataAvailable(
HistoryService::Handle request_handle,
scoped_refptr<RefCountedBytes> data) {
int request_id = cancelable_consumer_.GetClientDataForCurrentRequest();
// Forward the data along to the networking system.
if (data.get() && !data->data.empty()) {
SendResponse(request_id, data);
} else {
SendDefaultThumbnail(request_id);
}
}
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