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 "content/browser/host_zoom_map_impl.h"
   6
   7 #include <cmath>
   8
   9 #include "base/strings/string_piece.h"
  10 #include "base/strings/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 "net/base/net_util.h"
  22
  23 static const char* kHostZoomMapKeyName = "content_host_zoom_map";
  24
  25 namespace content {
  26
  27 HostZoomMap* HostZoomMap::GetForBrowserContext(BrowserContext* context) {
  28   HostZoomMapImpl* rv = static_cast<HostZoomMapImpl*>(
  29       context->GetUserData(kHostZoomMapKeyName));
  30   if (!rv) {
  31     rv = new HostZoomMapImpl();
  32     context->SetUserData(kHostZoomMapKeyName, rv);
  33   }
  34   return rv;
  35 }
  36
  37 HostZoomMapImpl::HostZoomMapImpl()
  38     : default_zoom_level_(0.0) {
  39   registrar_.Add(
  40       this, NOTIFICATION_RENDER_VIEW_HOST_WILL_CLOSE_RENDER_VIEW,
  41       NotificationService::AllSources());
  42 }
  43
  44 void HostZoomMapImpl::CopyFrom(HostZoomMap* copy_interface) {
  45   // This can only be called on the UI thread to avoid deadlocks, otherwise
  46   //   UI: a.CopyFrom(b);
  47   //   IO: b.CopyFrom(a);
  48   // can deadlock.
  49   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  50   HostZoomMapImpl* copy = static_cast<HostZoomMapImpl*>(copy_interface);
  51   base::AutoLock auto_lock(lock_);
  52   base::AutoLock copy_auto_lock(copy->lock_);
  53   host_zoom_levels_.
  54       insert(copy->host_zoom_levels_.begin(), copy->host_zoom_levels_.end());
  55   for (SchemeHostZoomLevels::const_iterator i(copy->
  56            scheme_host_zoom_levels_.begin());
  57        i != copy->scheme_host_zoom_levels_.end(); ++i) {
  58     scheme_host_zoom_levels_[i->first] = HostZoomLevels();
  59     scheme_host_zoom_levels_[i->first].
  60         insert(i->second.begin(), i->second.end());
  61   }
  62   default_zoom_level_ = copy->default_zoom_level_;
  63 }
  64
  65 double HostZoomMapImpl::GetZoomLevelForHost(const std::string& host) const {
  66   base::AutoLock auto_lock(lock_);
  67   HostZoomLevels::const_iterator i(host_zoom_levels_.find(host));
  68   return (i == host_zoom_levels_.end()) ? default_zoom_level_ : i->second;
  69 }
  70
  71 double HostZoomMapImpl::GetZoomLevelForHostAndScheme(
  72     const std::string& scheme,
  73     const std::string& host) const {
  74   {
  75     base::AutoLock auto_lock(lock_);
  76     SchemeHostZoomLevels::const_iterator scheme_iterator(
  77         scheme_host_zoom_levels_.find(scheme));
  78     if (scheme_iterator != scheme_host_zoom_levels_.end()) {
  79       HostZoomLevels::const_iterator i(scheme_iterator->second.find(host));
  80       if (i != scheme_iterator->second.end())
  81         return i->second;
  82     }
  83   }
  84   return GetZoomLevelForHost(host);
  85 }
  86
  87 HostZoomMap::ZoomLevelVector HostZoomMapImpl::GetAllZoomLevels() const {
  88   HostZoomMap::ZoomLevelVector result;
  89   {
  90     base::AutoLock auto_lock(lock_);
  91     result.reserve(host_zoom_levels_.size() + scheme_host_zoom_levels_.size());
  92     for (HostZoomLevels::const_iterator i = host_zoom_levels_.begin();
  93          i != host_zoom_levels_.end();
  94          ++i) {
  95       ZoomLevelChange change = {HostZoomMap::ZOOM_CHANGED_FOR_HOST,
  96                                 i->first,       // host
  97                                 std::string(),  // scheme
  98                                 i->second       // zoom level
  99       };
 100       result.push_back(change);
 101     }
 102     for (SchemeHostZoomLevels::const_iterator i =
 103              scheme_host_zoom_levels_.begin();
 104          i != scheme_host_zoom_levels_.end();
 105          ++i) {
 106       const std::string& scheme = i->first;
 107       const HostZoomLevels& host_zoom_levels = i->second;
 108       for (HostZoomLevels::const_iterator j = host_zoom_levels.begin();
 109            j != host_zoom_levels.end();
 110            ++j) {
 111         ZoomLevelChange change = {HostZoomMap::ZOOM_CHANGED_FOR_SCHEME_AND_HOST,
 112                                   j->first,  // host
 113                                   scheme,    // scheme
 114                                   j->second  // zoom level
 115         };
 116         result.push_back(change);
 117       }
 118     }
 119   }
 120   return result;
 121 }
 122
 123 void HostZoomMapImpl::SetZoomLevelForHost(const std::string& host,
 124                                           double level) {
 125   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 126
 127   {
 128     base::AutoLock auto_lock(lock_);
 129
 130     if (ZoomValuesEqual(level, default_zoom_level_))
 131       host_zoom_levels_.erase(host);
 132     else
 133       host_zoom_levels_[host] = level;
 134   }
 135
 136   // Notify renderers from this browser context.
 137   for (RenderProcessHost::iterator i(RenderProcessHost::AllHostsIterator());
 138        !i.IsAtEnd(); i.Advance()) {
 139     RenderProcessHost* render_process_host = i.GetCurrentValue();
 140     if (HostZoomMap::GetForBrowserContext(
 141             render_process_host->GetBrowserContext()) == this) {
 142       render_process_host->Send(
 143           new ViewMsg_SetZoomLevelForCurrentURL(std::string(), host, level));
 144     }
 145   }
 146   HostZoomMap::ZoomLevelChange change;
 147   change.mode = HostZoomMap::ZOOM_CHANGED_FOR_HOST;
 148   change.host = host;
 149   change.zoom_level = level;
 150
 151   zoom_level_changed_callbacks_.Notify(change);
 152 }
 153
 154 void HostZoomMapImpl::SetZoomLevelForHostAndScheme(const std::string& scheme,
 155                                                    const std::string& host,
 156                                                    double level) {
 157   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 158   {
 159     base::AutoLock auto_lock(lock_);
 160     scheme_host_zoom_levels_[scheme][host] = level;
 161   }
 162
 163   // Notify renderers from this browser context.
 164   for (RenderProcessHost::iterator i(RenderProcessHost::AllHostsIterator());
 165        !i.IsAtEnd(); i.Advance()) {
 166     RenderProcessHost* render_process_host = i.GetCurrentValue();
 167     if (HostZoomMap::GetForBrowserContext(
 168             render_process_host->GetBrowserContext()) == this) {
 169       render_process_host->Send(
 170           new ViewMsg_SetZoomLevelForCurrentURL(scheme, host, level));
 171     }
 172   }
 173
 174   HostZoomMap::ZoomLevelChange change;
 175   change.mode = HostZoomMap::ZOOM_CHANGED_FOR_SCHEME_AND_HOST;
 176   change.host = host;
 177   change.scheme = scheme;
 178   change.zoom_level = level;
 179
 180   zoom_level_changed_callbacks_.Notify(change);
 181 }
 182
 183 double HostZoomMapImpl::GetDefaultZoomLevel() const {
 184   return default_zoom_level_;
 185 }
 186
 187 void HostZoomMapImpl::SetDefaultZoomLevel(double level) {
 188   default_zoom_level_ = level;
 189 }
 190
 191 scoped_ptr<HostZoomMap::Subscription>
 192 HostZoomMapImpl::AddZoomLevelChangedCallback(
 193     const ZoomLevelChangedCallback& callback) {
 194   return zoom_level_changed_callbacks_.Add(callback);
 195 }
 196
 197 double HostZoomMapImpl::GetTemporaryZoomLevel(int render_process_id,
 198                                               int render_view_id) const {
 199   base::AutoLock auto_lock(lock_);
 200   for (size_t i = 0; i < temporary_zoom_levels_.size(); ++i) {
 201     if (temporary_zoom_levels_[i].render_process_id == render_process_id &&
 202         temporary_zoom_levels_[i].render_view_id == render_view_id) {
 203       return temporary_zoom_levels_[i].zoom_level;
 204     }
 205   }
 206   return 0;
 207 }
 208
 209 void HostZoomMapImpl::SetTemporaryZoomLevel(int render_process_id,
 210                                             int render_view_id,
 211                                             double level) {
 212   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 213
 214   {
 215     base::AutoLock auto_lock(lock_);
 216     size_t i;
 217     for (i = 0; i < temporary_zoom_levels_.size(); ++i) {
 218       if (temporary_zoom_levels_[i].render_process_id == render_process_id &&
 219           temporary_zoom_levels_[i].render_view_id == render_view_id) {
 220         if (level) {
 221           temporary_zoom_levels_[i].zoom_level = level;
 222         } else {
 223           temporary_zoom_levels_.erase(temporary_zoom_levels_.begin() + i);
 224         }
 225         break;
 226       }
 227     }
 228
 229     if (level && i == temporary_zoom_levels_.size()) {
 230       TemporaryZoomLevel temp;
 231       temp.render_process_id = render_process_id;
 232       temp.render_view_id = render_view_id;
 233       temp.zoom_level = level;
 234       temporary_zoom_levels_.push_back(temp);
 235     }
 236   }
 237
 238   HostZoomMap::ZoomLevelChange change;
 239   change.mode = HostZoomMap::ZOOM_CHANGED_TEMPORARY_ZOOM;
 240   change.zoom_level = level;
 241
 242   zoom_level_changed_callbacks_.Notify(change);
 243 }
 244
 245 void HostZoomMapImpl::Observe(int type,
 246                               const NotificationSource& source,
 247                               const NotificationDetails& details) {
 248   switch (type) {
 249     case NOTIFICATION_RENDER_VIEW_HOST_WILL_CLOSE_RENDER_VIEW: {
 250       base::AutoLock auto_lock(lock_);
 251       int render_view_id = Source<RenderViewHost>(source)->GetRoutingID();
 252       int render_process_id =
 253           Source<RenderViewHost>(source)->GetProcess()->GetID();
 254
 255       for (size_t i = 0; i < temporary_zoom_levels_.size(); ++i) {
 256         if (temporary_zoom_levels_[i].render_process_id == render_process_id &&
 257             temporary_zoom_levels_[i].render_view_id == render_view_id) {
 258           temporary_zoom_levels_.erase(temporary_zoom_levels_.begin() + i);
 259           break;
 260         }
 261       }
 262       break;
 263     }
 264     default:
 265       NOTREACHED() << "Unexpected preference observed.";
 266   }
 267 }
 268
 269 HostZoomMapImpl::~HostZoomMapImpl() {
 270 }
 271
 272 }  // namespace content