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
|
//------------------------------------------------------------------------------
// <copyright file="HtmlInputCheckBox.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
/*
* HtmlInputCheckBox.cs
*
* Copyright (c) 2000 Microsoft Corporation
*/
namespace System.Web.UI.HtmlControls {
using System.ComponentModel;
using System;
using System.Collections;
using System.Collections.Specialized;
using System.Globalization;
using System.Web;
using System.Web.UI;
using System.Security.Permissions;
/// <devdoc>
/// <para>
/// The <see langword='HtmlInputCheckBox'/> class defines the methods,
/// properties, and events for the HtmlInputCheckBox control. This class allows
/// programmatic access to the HTML <input type=
/// checkbox>
/// element on the server.
/// </para>
/// </devdoc>
[
DefaultEvent("ServerChange"),
SupportsEventValidation,
]
public class HtmlInputCheckBox : HtmlInputControl, IPostBackDataHandler {
private static readonly object EventServerChange = new object();
/*
* Creates an intrinsic Html INPUT type=checkbox control.
*/
/// <devdoc>
/// <para>Initializes a new instance of a <see cref='System.Web.UI.HtmlControls.HtmlInputCheckBox'/> class.</para>
/// </devdoc>
public HtmlInputCheckBox() : base("checkbox") {
}
/*
* Checked property.
*/
/// <devdoc>
/// <para>Gets or sets a value indicating whether the checkbox is
/// currently selected.</para>
/// </devdoc>
[
WebCategory("Default"),
DefaultValue(""),
DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
TypeConverter(typeof(MinimizableAttributeTypeConverter))
]
public bool Checked {
get {
string s = Attributes["checked"];
return((s != null) ? (s.Equals("checked")) : false);
}
set {
if (value)
Attributes["checked"] = "checked";
else
Attributes["checked"] = null;
}
}
/*
* Adds an event handler for the OnServerChange event.
* value: New handler to install for this event.
*/
/// <devdoc>
/// <para>Occurs when </para>
/// </devdoc>
[
WebCategory("Action"),
WebSysDescription(SR.Control_OnServerCheckChanged)
]
public event EventHandler ServerChange {
add {
Events.AddHandler(EventServerChange, value);
}
remove {
Events.RemoveHandler(EventServerChange, value);
}
}
/*
* This method is invoked just prior to rendering.
*/
/// <internalonly/>
/// <devdoc>
/// </devdoc>
protected internal override void OnPreRender(EventArgs e) {
base.OnPreRender(e);
if (Page != null && !Disabled) {
Page.RegisterRequiresPostBack(this);
Page.RegisterEnabledControl(this);
}
// if no change handler, no need to save posted property unless
// we are disabled
if (Events[EventServerChange] == null && !Disabled) {
ViewState.SetItemDirty("checked",false);
}
}
/*
* Method used to raise the OnServerChange event.
*/
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
protected virtual void OnServerChange(EventArgs e) {
// invoke delegates AFTER binding
EventHandler handler = (EventHandler)Events[EventServerChange];
if (handler != null) handler(this, e);
}
/*
* Method of IPostBackDataHandler interface to process posted data.
* Checkbox determines the posted Checked state.
*/
/// <internalonly/>
bool IPostBackDataHandler.LoadPostData(string postDataKey, NameValueCollection postCollection) {
return LoadPostData(postDataKey, postCollection);
}
/// <internalonly/>
protected virtual bool LoadPostData(string postDataKey, NameValueCollection postCollection) {
string post = postCollection[postDataKey];
bool newValue = !String.IsNullOrEmpty(post);
bool valueChanged = (newValue != Checked);
Checked = newValue;
if (newValue) {
ValidateEvent(postDataKey);
}
return valueChanged;
}
protected override void RenderAttributes(HtmlTextWriter writer) {
base.RenderAttributes(writer);
if (Page != null) {
Page.ClientScript.RegisterForEventValidation(RenderedNameAttribute);
}
}
/*
* Method of IPostBackDataHandler interface which is invoked whenever
* posted data for a control has changed. RadioButton fires an
* OnServerChange event.
*/
/// <internalonly/>
void IPostBackDataHandler.RaisePostDataChangedEvent() {
RaisePostDataChangedEvent();
}
/// <internalonly/>
protected virtual void RaisePostDataChangedEvent() {
OnServerChange(EventArgs.Empty);
}
}
}
|
