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
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
|
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Input;
namespace Tango.Core.Commands
{
public class RelayCommand : ICommand
{
protected Action<object> _action;
protected Func<object, bool> _canExecute;
public event EventHandler<object> Executed;
public RelayCommand(Action<object> action, Func<object, bool> canExecute)
{
_action = action;
_canExecute = canExecute;
}
public RelayCommand(Action<object> action, Func<bool> canExecute) : this(action, new Func<object, bool>((x) => canExecute()))
{
}
public RelayCommand(Action<object> action) : this(action, new Func<object, bool>((x) => true))
{
}
public RelayCommand(Action action, Func<object, bool> canExecute) : this((x) => action(), canExecute)
{
}
public RelayCommand(Action action) : this((x) => action(), new Func<object, bool>((x) => true))
{
}
public RelayCommand(Action action, Func<bool> canExecute) : this((x) => action(), canExecute)
{
}
public virtual bool CanExecute(object parameter)
{
try
{
return _canExecute != null ? _canExecute(parameter) : true;
}
catch (Exception ex)
{
Debug.WriteLine("Error on CanExecute RelayCommand\n" + ex);
return false;
}
}
public virtual void Execute(object parameter)
{
_action?.Invoke(parameter);
Executed?.Invoke(this, parameter);
}
public void RaiseCanExecuteChanged()
{
CanExecuteChanged?.Invoke(this, new EventArgs());
}
public event EventHandler CanExecuteChanged;
}
public class RelayCommand<T> : RelayCommand
{
public new event EventHandler<T> Executed;
public RelayCommand(Action<T> action, Func<T, bool> canExecute) : base((x) => action((T)x), (x) => canExecute((T)x))
{
}
public RelayCommand(Action<T> action, Func<bool> canExecute) : this(action, new Func<T, bool>((x) => canExecute()))
{
}
public RelayCommand(Action<T> action) : base((x) => action((T)x))
{
}
public override void Execute(object parameter)
{
_action?.Invoke(parameter);
Executed?.Invoke(this, parameter != null ? (T)parameter : default(T));
}
}
public class DelayedRelayCommand : RelayCommand
{
public TimeSpan Delay { get; set; }
public DelayedRelayCommand(Action<object> action) : base(action)
{
}
public DelayedRelayCommand(Action action) : base(action)
{
}
public DelayedRelayCommand(Action<object> action, Func<object, bool> canExecute) : base(action, canExecute)
{
}
public DelayedRelayCommand(Action<object> action, Func<bool> canExecute) : base(action, canExecute)
{
}
public DelayedRelayCommand(Action action, Func<object, bool> canExecute) : base(action, canExecute)
{
}
public DelayedRelayCommand(Action action, Func<bool> canExecuteChange) : base(action, canExecuteChange)
{
}
public override async void Execute(object parameter)
{
await Task.Delay(Delay);
base.Execute(parameter);
}
}
///// <summary>
///// RelayCommand is a very easy-to-use implementation of ICommand. You can use a RelayCommand to expose viewmodel functionality as a command, and
///// supply the condition that determines the command's availability. A control in the view bound to a command can execute an available command will</summary>
///// update its enabled state in response to the availability of the command.
///// <seealso cref="System.Windows.Input.ICommand" />
//public sealed class RelayCommand : ICommand
//{
// #region fields
// readonly Predicate<object> canExecute;
// readonly Action<object> execute;
// #endregion fields
// #region constructors
// public RelayCommand(Action<object> execute) : this(execute, null) { }
// public RelayCommand(Action<object> execute, Predicate<object> canExecute)
// {
// this.execute = execute;
// this.canExecute = canExecute;
// }
// public RelayCommand(Action execute)
// : this((x) => execute())
// {
// }
// public RelayCommand(Action execute, Func<bool> canExecute) : this((x) => execute(), (x) => canExecute())
// {
// }
// public RelayCommand(Action execute, Predicate<object> canExecute)
// : this((x) => execute(), canExecute)
// {
// }
// #endregion constructors
// #region methods
// public void RaiseCanExecuteChanged()
// {
// if (this.CanExecuteChanged != null)
// {
// this.CanExecuteChanged(this, EventArgs.Empty);
// }
// }
// #endregion methods
// #region ICommand events
// public event EventHandler CanExecuteChanged;
// #endregion ICommand events
// #region ICommand methods
// public bool CanExecute(object parameter)
// {
// return this.canExecute != null ? this.canExecute(parameter) : true;
// }
// public void Execute(object parameter)
// {
// if (this.execute != null)
// {
// this.execute(parameter);
// }
// }
// #endregion ICommand methods
//}
//public sealed class RelayCommand<T> : ICommand
//{
// #region Events
// public event EventHandler<T> Executed;
// #endregion
// #region fields
// readonly Predicate<object> canExecute;
// readonly Action<T> execute;
// #endregion fields
// #region constructors
// public RelayCommand(Action<T> execute) : this(execute, null) { }
// public RelayCommand(Action<T> execute, Predicate<object> canExecute)
// {
// this.execute = execute;
// this.canExecute = canExecute;
// }
// public RelayCommand(Action execute)
// : this((x) => execute())
// {
// }
// #endregion constructors
// #region methods
// public void RaiseCanExecuteChanged()
// {
// if (this.CanExecuteChanged != null)
// {
// this.CanExecuteChanged(this, EventArgs.Empty);
// }
// }
// #endregion methods
// #region ICommand events
// public event EventHandler CanExecuteChanged;
// #endregion ICommand events
// #region ICommand methods
// public bool CanExecute(object parameter)
// {
// return this.canExecute != null ? this.canExecute(parameter) : true;
// }
// public void Execute(object parameter)
// {
// if (this.execute != null)
// {
// this.execute((T)parameter);
// Executed?.Invoke(this, (T)parameter);
// }
// }
// #endregion ICommand methods
//}
}
|
