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      1 // Copyright 2013 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/public/browser/desktop_media_id.h"
      6 
      7 #include <vector>
      8 
      9 #include "base/memory/singleton.h"
     10 #include "base/strings/string_split.h"
     11 
     12 #if defined(USE_AURA)
     13 #include "ui/aura/window.h"
     14 #include "ui/aura/window_observer.h"
     15 #endif  // defined(USE_AURA)
     16 
     17 namespace  {
     18 
     19 #if defined(USE_AURA)
     20 
     21 class AuraWindowRegistry : public aura::WindowObserver {
     22  public:
     23   static AuraWindowRegistry* GetInstance() {
     24     return Singleton<AuraWindowRegistry>::get();
     25   }
     26 
     27   int RegisterWindow(aura::Window* window) {
     28     // First check if an Id is already assigned to the |window|.
     29     std::map<aura::Window*, int>::iterator it = window_to_id_map_.find(window);
     30     if (it != window_to_id_map_.end()) {
     31       return it->second;
     32     }
     33 
     34     // If the windows doesn't have an Id yet assign it.
     35     int id = next_id_++;
     36     window_to_id_map_[window] = id;
     37     id_to_window_map_[id] = window;
     38     window->AddObserver(this);
     39     return id;
     40   }
     41 
     42   aura::Window* GetWindowById(int id) {
     43     std::map<int, aura::Window*>::iterator it = id_to_window_map_.find(id);
     44     return (it != id_to_window_map_.end()) ? it->second : NULL;
     45   }
     46 
     47  private:
     48   friend struct DefaultSingletonTraits<AuraWindowRegistry>;
     49 
     50   AuraWindowRegistry()
     51       : next_id_(0) {
     52   }
     53   virtual ~AuraWindowRegistry() {}
     54 
     55   // WindowObserver overrides.
     56   virtual void OnWindowDestroying(aura::Window* window) OVERRIDE {
     57     std::map<aura::Window*, int>::iterator it = window_to_id_map_.find(window);
     58     DCHECK(it != window_to_id_map_.end());
     59     id_to_window_map_.erase(it->second);
     60     window_to_id_map_.erase(it);
     61   }
     62 
     63   int next_id_;
     64   std::map<aura::Window*, int> window_to_id_map_;
     65   std::map<int, aura::Window*> id_to_window_map_;
     66 
     67   DISALLOW_COPY_AND_ASSIGN(AuraWindowRegistry);
     68 };
     69 
     70 #endif  // defined(USE_AURA)
     71 
     72 }  // namespace
     73 
     74 namespace content {
     75 
     76 const char kScreenPrefix[] = "screen";
     77 const char kWindowPrefix[] = "window";
     78 const char kAuraWindowPrefix[] = "aura_window";
     79 
     80 #if defined(USE_AURA)
     81 
     82 // static
     83 DesktopMediaID DesktopMediaID::RegisterAuraWindow(aura::Window* window) {
     84   return DesktopMediaID(
     85       TYPE_AURA_WINDOW,
     86       AuraWindowRegistry::GetInstance()->RegisterWindow(window));
     87 }
     88 
     89 // static
     90 aura::Window* DesktopMediaID::GetAuraWindowById(const DesktopMediaID& id) {
     91   DCHECK_EQ(id.type, TYPE_AURA_WINDOW);
     92   return AuraWindowRegistry::GetInstance()->GetWindowById(id.id);
     93 }
     94 
     95 #endif  // defined(USE_AURA)
     96 
     97 // static
     98 DesktopMediaID DesktopMediaID::Parse(const std::string& str) {
     99   std::vector<std::string> parts;
    100   base::SplitString(str, ':', &parts);
    101 
    102   if (parts.size() != 2)
    103     return DesktopMediaID(TYPE_NONE, 0);
    104 
    105   Type type = TYPE_NONE;
    106   if (parts[0] == kScreenPrefix) {
    107     type = TYPE_SCREEN;
    108   } else if (parts[0] == kWindowPrefix) {
    109     type = TYPE_WINDOW;
    110   } else if (parts[0] == kAuraWindowPrefix) {
    111     type = TYPE_AURA_WINDOW;
    112   } else {
    113     return DesktopMediaID(TYPE_NONE, 0);
    114   }
    115 
    116   int64 id;
    117   if (!base::StringToInt64(parts[1], &id))
    118     return DesktopMediaID(TYPE_NONE, 0);
    119 
    120   return DesktopMediaID(type, id);
    121 }
    122 
    123 std::string DesktopMediaID::ToString() {
    124   std::string prefix;
    125   switch (type) {
    126     case TYPE_NONE:
    127       NOTREACHED();
    128       return std::string();
    129     case TYPE_SCREEN:
    130       prefix = kScreenPrefix;
    131       break;
    132     case TYPE_WINDOW:
    133       prefix = kWindowPrefix;
    134       break;
    135     case TYPE_AURA_WINDOW:
    136       prefix = kAuraWindowPrefix;
    137       break;
    138   }
    139   DCHECK(!prefix.empty());
    140 
    141   prefix.append(":");
    142   prefix.append(base::Int64ToString(id));
    143 
    144   return prefix;
    145 }
    146 
    147 }  // namespace content
    148