chrome/browser/ui/zoom/zoom_controller.cc

   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   Profile* profile =
  30       Profile::FromBrowserContext(web_contents->GetBrowserContext());
  31   default_zoom_level_.Init(prefs::kDefaultZoomLevel, profile->GetPrefs(),
  32                            base::Bind(&ZoomController::UpdateState,
  33                                       base::Unretained(this),
  34                                       std::string()));
  35
  36   zoom_subscription_ = content::HostZoomMap::GetForBrowserContext(
  37       browser_context_)->AddZoomLevelChangedCallback(
  38           base::Bind(&ZoomController::OnZoomLevelChanged,
  39                      base::Unretained(this)));
  40
  41   UpdateState(std::string());
  42 }
  43
  44 ZoomController::~ZoomController() {}
  45
  46 bool ZoomController::IsAtDefaultZoom() const {
  47   return content::ZoomValuesEqual(web_contents()->GetZoomLevel(),
  48                                   default_zoom_level_.GetValue());
  49 }
  50
  51 int ZoomController::GetResourceForZoomLevel() const {
  52   if (IsAtDefaultZoom())
  53     return IDR_ZOOM_NORMAL;
  54   double zoom = web_contents()->GetZoomLevel();
  55   return zoom > default_zoom_level_.GetValue() ? IDR_ZOOM_PLUS : IDR_ZOOM_MINUS;
  56 }
  57
  58 void ZoomController::DidNavigateMainFrame(
  59     const content::LoadCommittedDetails& details,
  60     const content::FrameNavigateParams& params) {
  61   // If the main frame's content has changed, the new page may have a different
  62   // zoom level from the old one.
  63   UpdateState(std::string());
  64 }
  65
  66 void ZoomController::OnZoomLevelChanged(
  67     const content::HostZoomMap::ZoomLevelChange& change) {
  68   UpdateState(change.host);
  69 }
  70
  71 void ZoomController::UpdateState(const std::string& host) {
  72   // If |host| is empty, all observers should be updated.
  73   if (!host.empty()) {
  74     // Use the navigation entry's URL instead of the WebContents' so virtual
  75     // URLs work (e.g. chrome://settings). http://crbug.com/153950
  76     content::NavigationEntry* entry =
  77         web_contents()->GetController().GetLastCommittedEntry();
  78     if (!entry ||
  79         host != net::GetHostOrSpecFromURL(entry->GetURL())) {
  80       return;
  81     }
  82   }
  83
  84   bool dummy;
  85   zoom_percent_ = web_contents()->GetZoomPercent(&dummy, &dummy);
  86
  87   if (observer_)
  88     observer_->OnZoomChanged(web_contents(), !host.empty());
  89 }