1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/views/view_storage.h"
#include <algorithm>
#include "chrome/common/notification_service.h"
#include "chrome/common/stl_util-inl.h"
namespace views {
ViewStorage* ViewStorage::shared_instance_ = NULL;
// This struct contains the information to locate a specific view.
// Locating a view is not always straight-forward as a view can be a floating
// view, or the child of a floating view. Floating views are frequently deleted
// and recreated (typically when their container is laid out).
struct ViewLocationInfo {
// True if the view is floating or the child of a floating view. False
// otherwise.
bool is_floating_view;
// If non floating, this is the stored view. If floating, the parent of the
// floating view.
View* view;
// The id of the floating view.
int floating_view_id;
// The path from the floating view to the stored view. The path is composed
// of the indexes of the views in the hierarchy.
std::vector<int> floating_view_to_view_path;
};
// static
ViewStorage* ViewStorage::GetSharedInstance() {
if (shared_instance_)
return shared_instance_;
shared_instance_ = new ViewStorage();
return shared_instance_;
}
// static
void ViewStorage::DeleteSharedInstance() {
if (!shared_instance_)
return;
delete shared_instance_;
shared_instance_ = NULL;
}
ViewStorage::ViewStorage() : view_storage_next_id_(0) {
NotificationService::current()->AddObserver(
this, NotificationType::VIEW_REMOVED, NotificationService::AllSources());
}
ViewStorage::~ViewStorage() {
NotificationService::current()->RemoveObserver(
this, NotificationType::VIEW_REMOVED, NotificationService::AllSources());
STLDeleteContainerPairSecondPointers(id_to_view_location_.begin(),
id_to_view_location_.end());
STLDeleteContainerPairSecondPointers(view_to_ids_.begin(),
view_to_ids_.end());
}
int ViewStorage::CreateStorageID() {
return view_storage_next_id_++;
}
void ViewStorage::StoreView(int storage_id, View* view) {
DCHECK(view);
std::map<int, ViewLocationInfo*>::iterator iter =
id_to_view_location_.find(storage_id);
DCHECK(iter == id_to_view_location_.end());
if (iter != id_to_view_location_.end())
RemoveView(storage_id);
ViewLocationInfo* view_location_info = new ViewLocationInfo();
View* floating_view_parent = view->RetrieveFloatingViewParent();
if (floating_view_parent) {
// The view is a floating view or is a child of a floating view.
view_location_info->is_floating_view = true;
view_location_info->view = floating_view_parent->GetParent();
view_location_info->floating_view_id =
floating_view_parent->GetFloatingViewID();
// Ley's store the path from the floating view to the actual view so we can
// locate it when restoring.
View::GetViewPath(floating_view_parent, view,
&(view_location_info->floating_view_to_view_path));
} else {
// It is a non floating view, it can be stored as is.
view_location_info->is_floating_view = false;
view_location_info->view = view;
}
id_to_view_location_[storage_id] = view_location_info;
std::vector<int>* ids = NULL;
std::map<View*, std::vector<int>*>::iterator id_iter =
view_to_ids_.find(view_location_info->view);
if (id_iter == view_to_ids_.end()) {
ids = new std::vector<int>();
view_to_ids_[view_location_info->view] = ids;
} else {
ids = id_iter->second;
}
ids->push_back(storage_id);
}
View* ViewStorage::RetrieveView(int storage_id) {
std::map<int, ViewLocationInfo*>::iterator iter =
id_to_view_location_.find(storage_id);
if (iter == id_to_view_location_.end())
return NULL;
ViewLocationInfo* view_location_info = iter->second;
if (view_location_info->is_floating_view) {
View* floating_view = view_location_info->view->
RetrieveFloatingViewForID(view_location_info->floating_view_id);
View* v = NULL;
if (floating_view) {
v = View::GetViewForPath(floating_view,
view_location_info->floating_view_to_view_path);
}
if (!v) {
// If we have not found the view, it means either the floating view with
// the id we have is gone, or it has changed and the actual child view
// we have the path for is not accessible. In that case, let's make sure
// we don't leak the ViewLocationInfo.
RemoveView(storage_id);
}
return v;
} else {
return view_location_info->view;
}
}
void ViewStorage::RemoveView(int storage_id) {
EraseView(storage_id, false);
}
void ViewStorage::EraseView(int storage_id, bool remove_all_ids) {
// Remove the view from id_to_view_location_.
std::map<int, ViewLocationInfo*>::iterator location_iter =
id_to_view_location_.find(storage_id);
if (location_iter == id_to_view_location_.end())
return;
ViewLocationInfo* view_location = location_iter->second;
View* view = view_location->view;
delete view_location;
id_to_view_location_.erase(location_iter);
// Also update view_to_ids_.
std::map<View*, std::vector<int>*>::iterator ids_iter =
view_to_ids_.find(view);
DCHECK(ids_iter != view_to_ids_.end());
std::vector<int>* ids = ids_iter->second;
if (remove_all_ids) {
for (size_t i = 0; i < ids->size(); ++i) {
location_iter = id_to_view_location_.find((*ids)[i]);
if (location_iter != id_to_view_location_.end()) {
delete location_iter->second;
id_to_view_location_.erase(location_iter);
}
}
ids->clear();
} else {
std::vector<int>::iterator id_iter =
std::find(ids->begin(), ids->end(), storage_id);
DCHECK(id_iter != ids->end());
ids->erase(id_iter);
}
if (ids->empty()) {
delete ids;
view_to_ids_.erase(ids_iter);
}
}
void ViewStorage::Observe(NotificationType type,
const NotificationSource& source,
const NotificationDetails& details) {
DCHECK(type == NotificationType::VIEW_REMOVED);
// Let's first retrieve the ids for that view.
std::map<View*, std::vector<int>*>::iterator ids_iter =
view_to_ids_.find(Source<View>(source).ptr());
if (ids_iter == view_to_ids_.end()) {
// That view is not in the view storage.
return;
}
std::vector<int>* ids = ids_iter->second;
DCHECK(!ids->empty());
EraseView((*ids)[0], true);
}
} // namespace views
|
