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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 "chrome/browser/ui/zoom/zoom_controller.h"
#include "chrome/browser/prefs/pref_service.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/ui/browser_finder.h"
#include "chrome/common/chrome_notification_types.h"
#include "chrome/common/pref_names.h"
#include "content/public/browser/host_zoom_map.h"
#include "content/public/browser/navigation_entry.h"
#include "content/public/browser/notification_types.h"
#include "content/public/browser/notification_details.h"
#include "content/public/browser/notification_service.h"
#include "content/public/browser/web_contents.h"
#include "content/public/common/page_zoom.h"
#include "grit/theme_resources.h"
#include "net/base/net_util.h"
DEFINE_WEB_CONTENTS_USER_DATA_KEY(ZoomController);
ZoomController::ZoomController(content::WebContents* web_contents)
: content::WebContentsObserver(web_contents),
zoom_percent_(100),
observer_(NULL),
browser_context_(web_contents->GetBrowserContext()),
zoom_callback_(base::Bind(&ZoomController::OnZoomLevelChanged,
base::Unretained(this))) {
Profile* profile =
Profile::FromBrowserContext(web_contents->GetBrowserContext());
default_zoom_level_.Init(prefs::kDefaultZoomLevel, profile->GetPrefs(),
base::Bind(&ZoomController::UpdateState,
base::Unretained(this),
std::string()));
content::HostZoomMap::GetForBrowserContext(
browser_context_)->AddZoomLevelChangedCallback(
zoom_callback_);
UpdateState(std::string());
}
ZoomController::~ZoomController() {
content::HostZoomMap::GetForBrowserContext(
browser_context_)->RemoveZoomLevelChangedCallback(
zoom_callback_);
}
bool ZoomController::IsAtDefaultZoom() const {
return content::ZoomValuesEqual(web_contents()->GetZoomLevel(),
default_zoom_level_.GetValue());
}
int ZoomController::GetResourceForZoomLevel() const {
DCHECK(!IsAtDefaultZoom());
double zoom = web_contents()->GetZoomLevel();
return zoom > default_zoom_level_.GetValue() ? IDR_ZOOM_PLUS : IDR_ZOOM_MINUS;
}
void ZoomController::DidNavigateMainFrame(
const content::LoadCommittedDetails& details,
const content::FrameNavigateParams& params) {
// If the main frame's content has changed, the new page may have a different
// zoom level from the old one.
UpdateState(std::string());
}
void ZoomController::OnZoomLevelChanged(const std::string& host) {
UpdateState(host);
}
void ZoomController::UpdateState(const std::string& host) {
// If |host| is empty, all observers should be updated.
if (!host.empty()) {
// Use the active navigation entry's URL instead of the WebContents' so
// virtual URLs work (e.g. chrome://settings). http://crbug.com/153950
content::NavigationEntry* active_entry =
web_contents()->GetController().GetActiveEntry();
if (!active_entry ||
host != net::GetHostOrSpecFromURL(active_entry->GetURL())) {
return;
}
}
bool dummy;
zoom_percent_ = web_contents()->GetZoomPercent(&dummy, &dummy);
if (observer_)
observer_->OnZoomChanged(web_contents(), !host.empty());
}
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