前提
入行已经7,8年了，一直想做一套漂亮点的自定义控件，于是就有了本系列文章。
github：https://github.com/kwwwvagaa/netwinformcontrol
码云：
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nuget
install-package hzh_controls
目录
用处及效果
准备工作
这个比较简单，对label扩展，重绘划线即可
开始
添加一个类ucsplitlabel ，继承 label
代码比较少
1 // ***********************************************************************
2 // assembly : hzh_controls
3 // created : 2019-10-09
4 //
5 // ***********************************************************************
6 // <copyright file="ucsplitlabel.cs">
7 // copyright by huang zhenghui(黄正辉) all, qq group:568015492 qq:623128629 email:623128629@qq.com
8 // </copyright>
9 //
10 // blog: https://www.cnblogs.com/bfyx
11 // github：https://github.com/kwwwvagaa/netwinformcontrol
12 // gitee：https://gitee.com/kwwwvagaa/net_winform_custom_control.git
13 //
14 // if you use this code, please keep this note.
15 // ***********************************************************************
16 using system;
17 using system.collections.generic;
18 using system.linq;
19 using system.text;
20 using system.windows.forms;
21 using system.drawing;
22 using system.componentmodel;
23
24 namespace hzh_controls.controls
25 {
26 /// <summary>
27 /// class ucsplitlabel.
28 /// implements the <see cref="system.windows.forms.label" />
29 /// </summary>
30 /// <seealso cref="system.windows.forms.label" />
31 public class ucsplitlabel : label
32 {
33 /// <summary>
34 /// gets or sets the text.
35 /// </summary>
36 /// <value>the text.</value>
37 [localizable(true)]
38 public override string text
39 {
40 get
41 {
42 return base.text;
43 }
44 set
45 {
46 base.text = value;
47 resetmaxsize();
48 }
49 }
50 /// <summary>
51 /// 获取或设置控件显示的文字的字体。
52 /// </summary>
53 /// <value>the font.</value>
54 /// <permissionset>
55 /// <ipermission class="system.security.permissions.environmentpermission, mscorlib, version=2.0.3600.0, culture=neutral, publickeytoken=b77a5c561934e089" version="1" unrestricted="true" />
56 /// <ipermission class="system.security.permissions.fileiopermission, mscorlib, version=2.0.3600.0, culture=neutral, publickeytoken=b77a5c561934e089" version="1" unrestricted="true" />
57 /// <ipermission class="system.security.permissions.securitypermission, mscorlib, version=2.0.3600.0, culture=neutral, publickeytoken=b77a5c561934e089" version="1" flags="unmanagedcode, controlevidence" />
58 /// <ipermission class="system.diagnostics.performancecounterpermission, system, version=2.0.3600.0, culture=neutral, publickeytoken=b77a5c561934e089" version="1" unrestricted="true" />
59 /// </permissionset>
60 [localizable(true)]
61 public override font font
62 {
63 get
64 {
65 return base.font;
66 }
67 set
68 {
69 base.font = value;
70 resetmaxsize();
71 }
72 }
73 /// <summary>
74 /// 获取或设置大小，该大小是 <see cref="m:system.windows.forms.control.getpreferredsize(system.drawing.size)" /> 可以指定的下限。
75 /// </summary>
76 /// <value>the minimum size.</value>
77 [localizable(true)]
78 public override size minimumsize
79 {
80 get
81 {
82 return base.minimumsize;
83 }
84 set
85 {
86 base.minimumsize = value;
87 resetmaxsize();
88 }
89 }
90
91
92 /// <summary>
93 /// 获取或设置大小，该大小是 <see cref="m:system.windows.forms.control.getpreferredsize(system.drawing.size)" /> 可以指定的上限。
94 /// </summary>
95 /// <value>the maximum size.</value>
96 [localizable(true)]
97 public override size maximumsize
98 {
99 get
100 {
101 return base.maximumsize;
102 }
103 set
104 {
105 base.maximumsize = value;
106 resetmaxsize();
107 }
108 }
109 /// <summary>
110 /// 获取或设置一个值，该值指示是否自动调整控件的大小以完整显示其内容。
111 /// </summary>
112 /// <value><c>true</c> if [automatic size]; otherwise, <c>false</c>.</value>
113 /// <permissionset>
114 /// <ipermission class="system.security.permissions.environmentpermission, mscorlib, version=2.0.3600.0, culture=neutral, publickeytoken=b77a5c561934e089" version="1" unrestricted="true" />
115 /// <ipermission class="system.security.permissions.fileiopermission, mscorlib, version=2.0.3600.0, culture=neutral, publickeytoken=b77a5c561934e089" version="1" unrestricted="true" />
116 /// <ipermission class="system.security.permissions.securitypermission, mscorlib, version=2.0.3600.0, culture=neutral, publickeytoken=b77a5c561934e089" version="1" flags="unmanagedcode, controlevidence" />
117 /// <ipermission class="system.diagnostics.performancecounterpermission, system, version=2.0.3600.0, culture=neutral, publickeytoken=b77a5c561934e089" version="1" unrestricted="true" />
118 /// </permissionset>
119 [editorbrowsable(editorbrowsablestate.never), browsable(false)]
120 public override bool autosize
121 {
122 get
123 {
124 return base.autosize;
125 }
126 set
127 {
128 base.autosize = value;
129 }
130 }
131
132
133 /// <summary>
134 /// the line color
135 /// </summary>
136 private color linecolor = linecolors.light;
137
138 /// <summary>
139 /// gets or sets the color of the line.
140 /// </summary>
141 /// <value>the color of the line.</value>
142 public color linecolor
143 {
144 get { return linecolor; }
145 set
146 {
147 linecolor = value;
148 invalidate();
149 }
150 }
151
152 /// <summary>
153 /// resets the maximum size.
154 /// </summary>
155 private void resetmaxsize()
156 {
157 using (var g = this.creategraphics())
158 {
159 var _width = width;
160 var size = g.measurestring(string.isnullorempty(text) ? "a" : text, font);
161 if (minimumsize.height != (int)size.height)
162 minimumsize = new size(base.minimumsize.width, (int)size.height);
163 if (maximumsize.height != (int)size.height)
164 maximumsize = new size(base.maximumsize.width, (int)size.height);
165 this.width = _width;
166 }
167 }
168 /// <summary>
169 /// initializes a new instance of the <see cref="ucsplitlabel"/> class.
170 /// </summary>
171 public ucsplitlabel()
172 : base()
173 {
174 if (controlhelper.isdesignmode())
175 {
176 text = "分割线";
177 font = new font("微软雅黑", 8f);
178 }
179 this.autosize = false;
180 padding = new padding(20, 0, 0, 0);
181 minimumsize = new system.drawing.size(150, 10);
182 paddingchanged += ucsplitlabel_paddingchanged;
183 this.width = 200;
184 }
185
186 /// <summary>
187 /// handles the paddingchanged event of the ucsplitlabel control.
188 /// </summary>
189 /// <param name="sender">the source of the event.</param>
190 /// <param name="e">the <see cref="eventargs"/> instance containing the event data.</param>
191 void ucsplitlabel_paddingchanged(object sender, eventargs e)
192 {
193 if (padding.left < 20)
194 {
195 padding = new padding(20, padding.top, padding.right, padding.bottom);
196 }
197 }
198
199 /// <summary>
200 /// handles the <see cref="e:paint" /> event.
201 /// </summary>
202 /// <param name="e">包含事件数据的 <see cref="t:system.windows.forms.painteventargs" />。</param>
203 protected override void onpaint(painteventargs e)
204 {
205 base.onpaint(e);
206 var g = e.graphics;
207 g.setgdihigh();
208
209 var size = g.measurestring(text, font);
210 g.drawline(new pen(new solidbrush(linecolor)), new pointf(1, padding.top + (this.height - padding.top - padding.bottom) / 2), new pointf(padding.left - 2, padding.top + (this.height - padding.top - padding.bottom) / 2));
211 g.drawline(new pen(new solidbrush(linecolor)), new pointf(padding.left + size.width + 1, padding.top + (this.height - padding.top - padding.bottom) / 2), new pointf(width - padding.right, padding.top + (this.height - padding.top - padding.bottom) / 2));
212
213 }
214 }
215 }
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