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
|
//
// ContentCallbackRegistry.cs
//
// Author:
// Lluis Sanchez <llsan@microsoft.com>
//
// Copyright (c) 2019 Microsoft
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using System;
using System.Collections.Generic;
using System.Linq;
using MonoDevelop.Core;
namespace MonoDevelop.Ide.Gui.Documents
{
class ContentCallbackRegistry
{
List<ContentCallback> contentCallbacks;
Func<Type,object> contentGetter;
class ContentCallback : IDisposable
{
public bool IsAddCallback;
public ContentCallbackRegistry Owner;
public Type ContentType;
public Delegate Callback;
public object Content;
public void Dispose ()
{
Owner.contentCallbacks.Remove (this);
}
}
class ContentAddedOrRemovedCallback : IDisposable
{
public IDisposable ContentAddedRegistration;
public IDisposable ContentRemovedRegistration;
public void Dispose ()
{
ContentAddedRegistration.Dispose ();
ContentRemovedRegistration.Dispose ();
}
}
public ContentCallbackRegistry (Func<Type,object> contentGetter)
{
this.contentGetter = contentGetter;
}
public IDisposable RunWhenContentAdded<T> (Action<T> contentCallback)
{
if (contentCallbacks == null)
contentCallbacks = new List<ContentCallback> ();
var registration = new ContentCallback {
IsAddCallback = true,
Owner = this,
ContentType = typeof (T),
Callback = contentCallback
};
contentCallbacks.Add (registration);
var content = contentGetter (typeof(T));
if (content != null)
InvokeCallback (content, registration);
return registration;
}
public IDisposable RunWhenContentRemoved<T> (Action<T> contentCallback)
{
if (contentCallbacks == null)
contentCallbacks = new List<ContentCallback> ();
var registration = new ContentCallback {
IsAddCallback = false,
Owner = this,
ContentType = typeof (T),
Content = contentGetter (typeof (T)),
Callback = contentCallback
};
contentCallbacks.Add (registration);
return registration;
}
public IDisposable RunWhenContentAddedOrRemoved<T> (Action<T> addedCallback, Action<T> removedCallback)
{
return new ContentAddedOrRemovedCallback {
ContentAddedRegistration = RunWhenContentAdded (addedCallback),
ContentRemovedRegistration = RunWhenContentRemoved (removedCallback)
};
}
public void InvokeContentChangeCallbacks ()
{
if (contentCallbacks == null)
return;
// Get the list of callbacks, grouped by content type
foreach (var callbackSet in contentCallbacks.GroupBy (c => c.ContentType).ToList ()) {
var content = contentGetter (callbackSet.Key);
foreach (var callback in callbackSet)
InvokeCallback (content, callback);
}
}
void InvokeCallback (object content, ContentCallback callback)
{
bool invoke = false;
object contentArg = content;
if (callback.IsAddCallback) {
if (content != null && content != callback.Content)
invoke = true;
callback.Content = content;
} else {
if (content == null) {
if (callback.Content != null) {
invoke = true;
contentArg = callback.Content;
callback.Content = null;
}
} else {
// Content is available
if (callback.Content == null)
// Store the content, it will be used as argument when invoking this callback if the content is removed
callback.Content = content;
else if (callback.Content != content) {
// Content for this callback was stored, but the instance has changed. The callback has to be invoked for the old content
invoke = true;
contentArg = callback.Content;
callback.Content = content;
}
}
}
if (invoke) {
try {
callback.Callback.DynamicInvoke (contentArg);
} catch (Exception ex) {
LoggingService.LogInternalError ("Content callback invocation failed", ex);
}
}
}
}
}
|
