1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "chrome/browser/ui/zoom/zoom_controller.h" 6 7 #include "base/prefs/pref_service.h" 8 #include "chrome/browser/chrome_notification_types.h" 9 #include "chrome/browser/profiles/profile.h" 10 #include "chrome/browser/ui/browser_finder.h" 11 #include "chrome/common/pref_names.h" 12 #include "content/public/browser/host_zoom_map.h" 13 #include "content/public/browser/navigation_entry.h" 14 #include "content/public/browser/notification_details.h" 15 #include "content/public/browser/notification_service.h" 16 #include "content/public/browser/notification_types.h" 17 #include "content/public/browser/web_contents.h" 18 #include "content/public/common/page_zoom.h" 19 #include "grit/theme_resources.h" 20 #include "net/base/net_util.h" 21 22 DEFINE_WEB_CONTENTS_USER_DATA_KEY(ZoomController); 23 24 ZoomController::ZoomController(content::WebContents* web_contents) 25 : content::WebContentsObserver(web_contents), 26 zoom_percent_(100), 27 observer_(NULL), 28 browser_context_(web_contents->GetBrowserContext()), 29 zoom_callback_(base::Bind(&ZoomController::OnZoomLevelChanged, 30 base::Unretained(this))) { 31 Profile* profile = 32 Profile::FromBrowserContext(web_contents->GetBrowserContext()); 33 default_zoom_level_.Init(prefs::kDefaultZoomLevel, profile->GetPrefs(), 34 base::Bind(&ZoomController::UpdateState, 35 base::Unretained(this), 36 std::string())); 37 38 content::HostZoomMap::GetForBrowserContext( 39 browser_context_)->AddZoomLevelChangedCallback( 40 zoom_callback_); 41 42 UpdateState(std::string()); 43 } 44 45 ZoomController::~ZoomController() { 46 content::HostZoomMap::GetForBrowserContext( 47 browser_context_)->RemoveZoomLevelChangedCallback( 48 zoom_callback_); 49 } 50 51 bool ZoomController::IsAtDefaultZoom() const { 52 return content::ZoomValuesEqual(web_contents()->GetZoomLevel(), 53 default_zoom_level_.GetValue()); 54 } 55 56 int ZoomController::GetResourceForZoomLevel() const { 57 if (IsAtDefaultZoom()) 58 return IDR_ZOOM_NORMAL; 59 double zoom = web_contents()->GetZoomLevel(); 60 return zoom > default_zoom_level_.GetValue() ? IDR_ZOOM_PLUS : IDR_ZOOM_MINUS; 61 } 62 63 void ZoomController::DidNavigateMainFrame( 64 const content::LoadCommittedDetails& details, 65 const content::FrameNavigateParams& params) { 66 // If the main frame's content has changed, the new page may have a different 67 // zoom level from the old one. 68 UpdateState(std::string()); 69 } 70 71 void ZoomController::OnZoomLevelChanged( 72 const content::HostZoomMap::ZoomLevelChange& change) { 73 UpdateState(change.host); 74 } 75 76 void ZoomController::UpdateState(const std::string& host) { 77 // If |host| is empty, all observers should be updated. 78 if (!host.empty()) { 79 // Use the active navigation entry's URL instead of the WebContents' so 80 // virtual URLs work (e.g. chrome://settings). http://crbug.com/153950 81 content::NavigationEntry* active_entry = 82 web_contents()->GetController().GetActiveEntry(); 83 if (!active_entry || 84 host != net::GetHostOrSpecFromURL(active_entry->GetURL())) { 85 return; 86 } 87 } 88 89 bool dummy; 90 zoom_percent_ = web_contents()->GetZoomPercent(&dummy, &dummy); 91 92 if (observer_) 93 observer_->OnZoomChanged(web_contents(), !host.empty()); 94 } 95