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
|
/**
* Aggregates undo stack observers for convenient management and triggering in SPDocument
*
* Heavily inspired by Inkscape::XML::CompositeNodeObserver.
*
* Authors:
* David Yip <yipdw@rose-hulman.edu>
*
* Copyright (c) 2005 Authors
*
* Released under GNU GPL, read the file 'COPYING' for more information
*/
#include "composite-undo-stack-observer.h"
#include "xml/event.h"
namespace Inkscape {
CompositeUndoStackObserver::CompositeUndoStackObserver() : _iterating(0) { }
CompositeUndoStackObserver::~CompositeUndoStackObserver() { }
void
CompositeUndoStackObserver::add(UndoStackObserver& observer)
{
if (!this->_iterating) {
this->_active.push_back(UndoStackObserverRecord(observer));
} else {
this->_pending.push_back(UndoStackObserverRecord(observer));
}
}
void
CompositeUndoStackObserver::remove(UndoStackObserver& observer)
{
if (!this->_iterating) {
// logical-or operator short-circuits
this->_remove_one(this->_active, observer) || this->_remove_one(this->_pending, observer);
} else {
this->_mark_one(this->_active, observer) || this->_mark_one(this->_pending, observer);
}
}
void
CompositeUndoStackObserver::notifyUndoEvent(Event* log)
{
this->_lock();
for(UndoObserverRecordList::iterator i = this->_active.begin(); i != _active.end(); ++i) {
if (!i->to_remove) {
i->issueUndo(log);
}
}
this->_unlock();
}
void
CompositeUndoStackObserver::notifyRedoEvent(Event* log)
{
this->_lock();
for(UndoObserverRecordList::iterator i = this->_active.begin(); i != _active.end(); ++i) {
if (!i->to_remove) {
i->issueRedo(log);
}
}
this->_unlock();
}
void
CompositeUndoStackObserver::notifyUndoCommitEvent(Event* log)
{
this->_lock();
for(UndoObserverRecordList::iterator i = this->_active.begin(); i != _active.end(); ++i) {
if (!i->to_remove) {
i->issueUndoCommit(log);
}
}
this->_unlock();
}
bool
CompositeUndoStackObserver::_remove_one(UndoObserverRecordList& list, UndoStackObserver& o)
{
UndoStackObserverRecord eq_comp(o);
UndoObserverRecordList::iterator i = std::find_if(list.begin(), list.end(), std::bind1st(std::equal_to< UndoStackObserverRecord >(), eq_comp));
if (i != list.end()) {
list.erase(i);
return true;
} else {
return false;
}
}
bool
CompositeUndoStackObserver::_mark_one(UndoObserverRecordList& list, UndoStackObserver& o)
{
UndoStackObserverRecord eq_comp(o);
UndoObserverRecordList::iterator i = std::find_if(list.begin(), list.end(), std::bind1st(std::equal_to< UndoStackObserverRecord >(), eq_comp));
if (i != list.end()) {
(*i).to_remove = true;
return true;
} else {
return false;
}
}
void
CompositeUndoStackObserver::_unlock()
{
if (!--this->_iterating) {
// Remove marked observers
UndoObserverRecordList::iterator i = this->_active.begin();
for(; i != this->_active.begin(); i++) {
if (i->to_remove) {
this->_active.erase(i);
}
}
i = this->_pending.begin();
for(; i != this->_pending.begin(); i++) {
if (i->to_remove) {
this->_active.erase(i);
}
}
// Merge pending and active
this->_active.insert(this->_active.end(), this->_pending.begin(), this->_pending.end());
this->_pending.clear();
}
}
}
|
