content/browser/host_zoom_map_impl.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 <cmath>
   6
   7 #include "content/browser/host_zoom_map_impl.h"
   8
   9 #include "base/string_piece.h"
  10 #include "base/utf_string_conversions.h"
  11 #include "base/values.h"
  12 #include "content/browser/renderer_host/render_process_host_impl.h"
  13 #include "content/browser/renderer_host/render_view_host_impl.h"
  14 #include "content/common/view_messages.h"
  15 #include "content/public/browser/browser_context.h"
  16 #include "content/public/browser/browser_thread.h"
  17 #include "content/public/browser/notification_service.h"
  18 #include "content/public/browser/notification_types.h"
  19 #include "content/public/browser/resource_context.h"
  20 #include "content/public/common/page_zoom.h"
  21 #include "googleurl/src/gurl.h"
  22 #include "net/base/net_util.h"
  23 #include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
  24
  25 using WebKit::WebView;
  26
  27 static const char* kHostZoomMapKeyName = "content_host_zoom_map";
  28
  29 namespace content {
  30
  31 HostZoomMap* HostZoomMap::GetForBrowserContext(BrowserContext* context) {
  32   HostZoomMapImpl* rv = static_cast<HostZoomMapImpl*>(
  33       context->GetUserData(kHostZoomMapKeyName));
  34   if (!rv) {
  35     rv = new HostZoomMapImpl();
  36     context->SetUserData(kHostZoomMapKeyName, rv);
  37   }
  38   return rv;
  39 }
  40
  41 HostZoomMapImpl::HostZoomMapImpl()
  42     : default_zoom_level_(0.0) {
  43   registrar_.Add(
  44       this, NOTIFICATION_RENDER_VIEW_HOST_WILL_CLOSE_RENDER_VIEW,
  45       NotificationService::AllSources());
  46 }
  47
  48 void HostZoomMapImpl::CopyFrom(HostZoomMap* copy_interface) {
  49   // This can only be called on the UI thread to avoid deadlocks, otherwise
  50   //   UI: a.CopyFrom(b);
  51   //   IO: b.CopyFrom(a);
  52   // can deadlock.
  53   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  54   HostZoomMapImpl* copy = static_cast<HostZoomMapImpl*>(copy_interface);
  55   base::AutoLock auto_lock(lock_);
  56   base::AutoLock copy_auto_lock(copy->lock_);
  57   for (HostZoomLevels::const_iterator i(copy->host_zoom_levels_.begin());
  58        i != copy->host_zoom_levels_.end(); ++i) {
  59     host_zoom_levels_[i->first] = i->second;
  60   }
  61   default_zoom_level_ = copy->default_zoom_level_;
  62 }
  63
  64 double HostZoomMapImpl::GetZoomLevel(const std::string& host) const {
  65   base::AutoLock auto_lock(lock_);
  66   HostZoomLevels::const_iterator i(host_zoom_levels_.find(host));
  67   return (i == host_zoom_levels_.end()) ? default_zoom_level_ : i->second;
  68 }
  69
  70 void HostZoomMapImpl::SetZoomLevel(const std::string& host, double level) {
  71   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  72
  73   {
  74     base::AutoLock auto_lock(lock_);
  75
  76     if (ZoomValuesEqual(level, default_zoom_level_))
  77       host_zoom_levels_.erase(host);
  78     else
  79       host_zoom_levels_[host] = level;
  80   }
  81
  82   // Notify renderers from this browser context.
  83   for (RenderProcessHost::iterator i(RenderProcessHost::AllHostsIterator());
  84        !i.IsAtEnd(); i.Advance()) {
  85     RenderProcessHost* render_process_host = i.GetCurrentValue();
  86     if (HostZoomMap::GetForBrowserContext(
  87             render_process_host->GetBrowserContext()) == this) {
  88       render_process_host->Send(
  89           new ViewMsg_SetZoomLevelForCurrentURL(host, level));
  90     }
  91   }
  92
  93   NotificationService::current()->Notify(
  94       NOTIFICATION_ZOOM_LEVEL_CHANGED,
  95       Source<HostZoomMap>(this),
  96       Details<const std::string>(&host));
  97 }
  98
  99 double HostZoomMapImpl::GetDefaultZoomLevel() const {
 100   return default_zoom_level_;
 101 }
 102
 103 void HostZoomMapImpl::SetDefaultZoomLevel(double level) {
 104   default_zoom_level_ = level;
 105 }
 106
 107 double HostZoomMapImpl::GetTemporaryZoomLevel(int render_process_id,
 108                                               int render_view_id) const {
 109   base::AutoLock auto_lock(lock_);
 110   for (size_t i = 0; i < temporary_zoom_levels_.size(); ++i) {
 111     if (temporary_zoom_levels_[i].render_process_id == render_process_id &&
 112         temporary_zoom_levels_[i].render_view_id == render_view_id) {
 113       return temporary_zoom_levels_[i].zoom_level;
 114     }
 115   }
 116   return 0;
 117 }
 118
 119 void HostZoomMapImpl::SetTemporaryZoomLevel(int render_process_id,
 120                                             int render_view_id,
 121                                             double level) {
 122   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 123
 124   {
 125     base::AutoLock auto_lock(lock_);
 126     size_t i;
 127     for (i = 0; i < temporary_zoom_levels_.size(); ++i) {
 128       if (temporary_zoom_levels_[i].render_process_id == render_process_id &&
 129           temporary_zoom_levels_[i].render_view_id == render_view_id) {
 130         if (level) {
 131           temporary_zoom_levels_[i].zoom_level = level;
 132         } else {
 133           temporary_zoom_levels_.erase(temporary_zoom_levels_.begin() + i);
 134         }
 135         break;
 136       }
 137     }
 138
 139     if (level && i == temporary_zoom_levels_.size()) {
 140       TemporaryZoomLevel temp;
 141       temp.render_process_id = render_process_id;
 142       temp.render_view_id = render_view_id;
 143       temp.zoom_level = level;
 144       temporary_zoom_levels_.push_back(temp);
 145     }
 146   }
 147
 148   std::string host;
 149   NotificationService::current()->Notify(
 150       NOTIFICATION_ZOOM_LEVEL_CHANGED,
 151       Source<HostZoomMap>(this),
 152       Details<const std::string>(&host));
 153 }
 154
 155 void HostZoomMapImpl::Observe(int type,
 156                               const NotificationSource& source,
 157                               const NotificationDetails& details) {
 158   switch (type) {
 159     case NOTIFICATION_RENDER_VIEW_HOST_WILL_CLOSE_RENDER_VIEW: {
 160       base::AutoLock auto_lock(lock_);
 161       int render_view_id = Source<RenderViewHost>(source)->GetRoutingID();
 162       int render_process_id =
 163           Source<RenderViewHost>(source)->GetProcess()->GetID();
 164
 165       for (size_t i = 0; i < temporary_zoom_levels_.size(); ++i) {
 166         if (temporary_zoom_levels_[i].render_process_id == render_process_id &&
 167             temporary_zoom_levels_[i].render_view_id == render_view_id) {
 168           temporary_zoom_levels_.erase(temporary_zoom_levels_.begin() + i);
 169           break;
 170         }
 171       }
 172       break;
 173     }
 174     default:
 175       NOTREACHED() << "Unexpected preference observed.";
 176   }
 177 }
 178
 179 HostZoomMapImpl::~HostZoomMapImpl() {
 180 }
 181
 182 }  // namespace content