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 }
  62
  63 double HostZoomMapImpl::GetZoomLevel(const std::string& host) const {
  64   base::AutoLock auto_lock(lock_);
  65   HostZoomLevels::const_iterator i(host_zoom_levels_.find(host));
  66   return (i == host_zoom_levels_.end()) ? default_zoom_level_ : i->second;
  67 }
  68
  69 void HostZoomMapImpl::SetZoomLevel(const std::string& host, double level) {
  70   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  71
  72   {
  73     base::AutoLock auto_lock(lock_);
  74
  75     if (ZoomValuesEqual(level, default_zoom_level_))
  76       host_zoom_levels_.erase(host);
  77     else
  78       host_zoom_levels_[host] = level;
  79   }
  80
  81   // Notify renderers from this browser context.
  82   for (RenderProcessHost::iterator i(RenderProcessHost::AllHostsIterator());
  83        !i.IsAtEnd(); i.Advance()) {
  84     RenderProcessHost* render_process_host = i.GetCurrentValue();
  85     if (HostZoomMap::GetForBrowserContext(
  86             render_process_host->GetBrowserContext()) == this) {
  87       render_process_host->Send(
  88           new ViewMsg_SetZoomLevelForCurrentURL(host, level));
  89     }
  90   }
  91
  92   NotificationService::current()->Notify(
  93       NOTIFICATION_ZOOM_LEVEL_CHANGED,
  94       Source<HostZoomMap>(this),
  95       Details<const std::string>(&host));
  96 }
  97
  98 double HostZoomMapImpl::GetDefaultZoomLevel() const {
  99   return default_zoom_level_;
 100 }
 101
 102 void HostZoomMapImpl::SetDefaultZoomLevel(double level) {
 103   default_zoom_level_ = level;
 104 }
 105
 106 double HostZoomMapImpl::GetTemporaryZoomLevel(int render_process_id,
 107                                               int render_view_id) const {
 108   base::AutoLock auto_lock(lock_);
 109   for (size_t i = 0; i < temporary_zoom_levels_.size(); ++i) {
 110     if (temporary_zoom_levels_[i].render_process_id == render_process_id &&
 111         temporary_zoom_levels_[i].render_view_id == render_view_id) {
 112       return temporary_zoom_levels_[i].zoom_level;
 113     }
 114   }
 115   return 0;
 116 }
 117
 118 void HostZoomMapImpl::SetTemporaryZoomLevel(int render_process_id,
 119                                             int render_view_id,
 120                                             double level) {
 121   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 122
 123   {
 124     base::AutoLock auto_lock(lock_);
 125     size_t i;
 126     for (i = 0; i < temporary_zoom_levels_.size(); ++i) {
 127       if (temporary_zoom_levels_[i].render_process_id == render_process_id &&
 128           temporary_zoom_levels_[i].render_view_id == render_view_id) {
 129         if (level) {
 130           temporary_zoom_levels_[i].zoom_level = level;
 131         } else {
 132           temporary_zoom_levels_.erase(temporary_zoom_levels_.begin() + i);
 133         }
 134         break;
 135       }
 136     }
 137
 138     if (level && i == temporary_zoom_levels_.size()) {
 139       TemporaryZoomLevel temp;
 140       temp.render_process_id = render_process_id;
 141       temp.render_view_id = render_view_id;
 142       temp.zoom_level = level;
 143       temporary_zoom_levels_.push_back(temp);
 144     }
 145   }
 146
 147   std::string host;
 148   NotificationService::current()->Notify(
 149       NOTIFICATION_ZOOM_LEVEL_CHANGED,
 150       Source<HostZoomMap>(this),
 151       Details<const std::string>(&host));
 152 }
 153
 154 void HostZoomMapImpl::Observe(int type,
 155                               const NotificationSource& source,
 156                               const NotificationDetails& details) {
 157   switch (type) {
 158     case NOTIFICATION_RENDER_VIEW_HOST_WILL_CLOSE_RENDER_VIEW: {
 159       base::AutoLock auto_lock(lock_);
 160       int render_view_id = Source<RenderViewHost>(source)->GetRoutingID();
 161       int render_process_id =
 162           Source<RenderViewHost>(source)->GetProcess()->GetID();
 163
 164       for (size_t i = 0; i < temporary_zoom_levels_.size(); ++i) {
 165         if (temporary_zoom_levels_[i].render_process_id == render_process_id &&
 166             temporary_zoom_levels_[i].render_view_id == render_view_id) {
 167           temporary_zoom_levels_.erase(temporary_zoom_levels_.begin() + i);
 168           break;
 169         }
 170       }
 171       break;
 172     }
 173     default:
 174       NOTREACHED() << "Unexpected preference observed.";
 175   }
 176 }
 177
 178 HostZoomMapImpl::~HostZoomMapImpl() {
 179 }
 180
 181 }  // namespace content