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| 1 // Copyright (c) 2010 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 "app/view_prop.h" | |
| 6 | |
| 7 #include <set> | |
| 8 | |
| 9 namespace app { | |
| 10 | |
| 11 // Maints the actual view, key and data. | |
| 12 class ViewProp::Data : public base::RefCounted<ViewProp::Data> { | |
| 13 public: | |
| 14 // Returns the Data* for the view/key pair. If |create| is false and |Get| | |
| 15 // has not been invoked for the view/key pair, NULL is returned. | |
| 16 static void Get(gfx::NativeView view, | |
| 17 const char* key, | |
| 18 bool create, | |
| 19 scoped_refptr<Data>* data) { | |
| 20 if (!data_set_) | |
| 21 data_set_ = new DataSet; | |
| 22 scoped_refptr<Data> new_data(new Data(view, key)); | |
| 23 DataSet::const_iterator i = data_set_->find(new_data.get()); | |
| 24 if (i != data_set_->end()) { | |
| 25 *data = *i; | |
| 26 return; | |
| 27 } | |
| 28 if (!create) | |
| 29 return; | |
| 30 data_set_->insert(new_data.get()); | |
| 31 *data = new_data.get(); | |
| 32 } | |
| 33 | |
| 34 // The data. | |
| 35 void set_data(void* data) { data_ = data; } | |
| 36 void* data() const { return data_; } | |
| 37 | |
| 38 const char* key() const { return key_; } | |
| 39 | |
| 40 private: | |
| 41 friend class base::RefCounted<Data>; | |
| 42 | |
| 43 // Used to order the Data in the map. | |
| 44 class DataComparator { | |
| 45 public: | |
| 46 bool operator()(const Data* d1, const Data* d2) const { | |
| 47 return (d1->view_ == d2->view_) ? (d1->key_ < d2->key_) : | |
| 48 (d1->view_ < d2->view_); | |
| 49 } | |
| 50 }; | |
| 51 | |
| 52 typedef std::set<Data*, DataComparator> DataSet; | |
| 53 | |
| 54 Data(gfx::NativeView view, const char* key) | |
| 55 : view_(view), | |
| 56 key_(key), | |
| 57 data_(NULL) {} | |
| 58 | |
| 59 ~Data() { | |
| 60 DataSet::iterator i = data_set_->find(this); | |
| 61 // Also check for equality using == as |Get| creates dummy values in order | |
| 62 // to look up a value. | |
| 63 if (i != data_set_->end() && *i == this) | |
| 64 data_set_->erase(i); | |
| 65 } | |
| 66 | |
| 67 // The existing set of Data is stored here. ~Data removes from the set. | |
| 68 static DataSet* data_set_; | |
| 69 | |
| 70 const gfx::NativeView view_; | |
| 71 const char* key_; | |
| 72 void* data_; | |
| 73 | |
| 74 DISALLOW_COPY_AND_ASSIGN(Data); | |
| 75 }; | |
| 76 | |
| 77 // static | |
| 78 ViewProp::Data::DataSet* ViewProp::Data::data_set_ = NULL; | |
| 79 | |
| 80 ViewProp::ViewProp(gfx::NativeView view, const char* key, void* data) { | |
| 81 Data::Get(view, key, true, &data_); | |
| 82 data_->set_data(data); | |
| 83 } | |
| 84 | |
| 85 ViewProp::~ViewProp() { | |
| 86 // This is done to provide similar semantics to SetProp. In particular it's | |
| 87 // assumed that ~ViewProp should behave as though RemoveProp was invoked. | |
| 88 data_->set_data(NULL); | |
| 89 } | |
| 90 | |
| 91 // static | |
| 92 void* ViewProp::GetValue(gfx::NativeView view, const char* key) { | |
| 93 scoped_refptr<Data> data; | |
| 94 Data::Get(view, key, false, &data); | |
| 95 return data.get() ? data->data() : NULL; | |
| 96 } | |
| 97 | |
| 98 // static | |
| 99 const char* ViewProp::Key() const { | |
| 100 return data_->key(); | |
| 101 } | |
| 102 | |
| 103 } // namespace app | |
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Chromium Code Reviews
Issue 6257006:
Move a bunch of random other files to src/ui/base... (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src/