（四十八）c#Winform自定义控件-下拉按钮

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

这个控件将继承自（三）c#winform自定义控件-有图标的按钮，如不了解，请移步查看

开始

添加一个用户控件ucdropdownbtn，继承自ucbtnimg

处理一些属性

 1 forms.frmanchor _frmanchor;
 2         private int _droppanelheight = -1;
 3         public new event eventhandler btnclick;
 4         [description("下拉框高度"), category("自定义")]
 5         public int droppanelheight
 6         {
 7             get { return _droppanelheight; }
 8             set { _droppanelheight = value; }
 9         }
10         private string[] btns ;
11         [description("按钮"), category("自定义")]
12         public string[] btns
13         {
14             get { return btns; }
15             set { btns = value; }
16         }
17         [obsolete("不再可用的属性")]
18         [browsable(false), editorbrowsable(editorbrowsablestate.never)]
19         public override image image
20         {
21             get;
22             set;
23         }
24         [obsolete("不再可用的属性")]
25         [browsable(false), editorbrowsable(editorbrowsablestate.never)]
26         public override contentalignment imagealign
27         {
28             get;
29             set;
30         }

点击时候显示下拉框

 1 void ucdropdownbtn_btnclick(object sender, eventargs e)
 2         {
 3             if (_frmanchor == null || _frmanchor.isdisposed || _frmanchor.visible == false)
 4             {
 5 
 6                 if (btns != null && btns.length > 0)
 7                 {
 8                     int introw = 0;
 9                     int intcom = 1;
10                     var p = this.pointtoscreen(this.location);
11                     while (true)
12                     {
13                         int intscreenheight = screen.primaryscreen.bounds.height;
14                         if ((p.y + this.height + btns.length / intcom * 50 < intscreenheight || p.y - btns.length / intcom * 50 > 0)
15                             && (_droppanelheight <= 0 ? true : (btns.length / intcom * 50 <= _droppanelheight)))
16                         {
17                             introw = btns.length / intcom + (btns.length % intcom != 0 ? 1 : 0);
18                             break;
19                         }
20                         intcom++;
21                     }
22                     uctimepanel uctime = new uctimepanel();
23                     uctime.isshowborder = true;
24                     int intwidth = this.width / intcom;
25 
26                     size size = new size(intcom * intwidth, introw * 50);
27                     uctime.size = size;
28                     uctime.firstevent = true;
29                     uctime.selectsourceevent += uctime_selectsourceevent;
30                     uctime.row = introw;
31                     uctime.column = intcom;
32 
33                     list<keyvaluepair<string, string>> lst = new list<keyvaluepair<string, string>>();
34                     foreach (var item in btns)
35                     {
36                         lst.add(new keyvaluepair<string, string>(item, item));
37                     }
38                     uctime.source = lst;
39 
40                     _frmanchor = new forms.frmanchor(this, uctime);
41                     _frmanchor.load += (a, b) => { (a as form).size = size; };
42 
43                     _frmanchor.show(this.findform());
44 
45                 }
46             }
47             else
48             {
49                 _frmanchor.close();
50             }
51         }

处理一下按钮事件

 1 void uctime_selectsourceevent(object sender, eventargs e)
 2         {
 3             if (_frmanchor != null && !_frmanchor.isdisposed && _frmanchor.visible)
 4             {
 5                 _frmanchor.close();
 6 
 7                 if (btnclick != null)
 8                 {
 9                     btnclick(sender.tostring(), e);
10                 }
11             }
12         }

完整代码

  1 using system;
  2 using system.collections.generic;
  3 using system.componentmodel;
  4 using system.drawing;
  5 using system.data;
  6 using system.linq;
  7 using system.text;
  8 using system.windows.forms;
  9 
 10 namespace hzh_controls.controls.btn
 11 {
 12     [defaultevent("btnclick")]
 13     public partial class ucdropdownbtn : ucbtnimg
 14     {
 15         forms.frmanchor _frmanchor;
 16         private int _droppanelheight = -1;
 17         public new event eventhandler btnclick;
 18         [description("下拉框高度"), category("自定义")]
 19         public int droppanelheight
 20         {
 21             get { return _droppanelheight; }
 22             set { _droppanelheight = value; }
 23         }
 24         private string[] btns ;
 25         [description("按钮"), category("自定义")]
 26         public string[] btns
 27         {
 28             get { return btns; }
 29             set { btns = value; }
 30         }
 31         [obsolete("不再可用的属性")]
 32         [browsable(false), editorbrowsable(editorbrowsablestate.never)]
 33         public override image image
 34         {
 35             get;
 36             set;
 37         }
 38         [obsolete("不再可用的属性")]
 39         [browsable(false), editorbrowsable(editorbrowsablestate.never)]
 40         public override contentalignment imagealign
 41         {
 42             get;
 43             set;
 44         }
 45 
 46         public ucdropdownbtn()
 47         {
 48             initializecomponent();
 49             isshowtips = false;
 50             this.lbl.image=properties.resources.combobox;
 51             this.lbl.imagealign = contentalignment.middleright;
 52             base.btnclick += ucdropdownbtn_btnclick;
 53         }
 54 
 55         void ucdropdownbtn_btnclick(object sender, eventargs e)
 56         {
 57             if (_frmanchor == null || _frmanchor.isdisposed || _frmanchor.visible == false)
 58             {
 59 
 60                 if (btns != null && btns.length > 0)
 61                 {
 62                     int introw = 0;
 63                     int intcom = 1;
 64                     var p = this.pointtoscreen(this.location);
 65                     while (true)
 66                     {
 67                         int intscreenheight = screen.primaryscreen.bounds.height;
 68                         if ((p.y + this.height + btns.length / intcom * 50 < intscreenheight || p.y - btns.length / intcom * 50 > 0)
 69                             && (_droppanelheight <= 0 ? true : (btns.length / intcom * 50 <= _droppanelheight)))
 70                         {
 71                             introw = btns.length / intcom + (btns.length % intcom != 0 ? 1 : 0);
 72                             break;
 73                         }
 74                         intcom++;
 75                     }
 76                     uctimepanel uctime = new uctimepanel();
 77                     uctime.isshowborder = true;
 78                     int intwidth = this.width / intcom;
 79 
 80                     size size = new size(intcom * intwidth, introw * 50);
 81                     uctime.size = size;
 82                     uctime.firstevent = true;
 83                     uctime.selectsourceevent += uctime_selectsourceevent;
 84                     uctime.row = introw;
 85                     uctime.column = intcom;
 86 
 87                     list<keyvaluepair<string, string>> lst = new list<keyvaluepair<string, string>>();
 88                     foreach (var item in btns)
 89                     {
 90                         lst.add(new keyvaluepair<string, string>(item, item));
 91                     }
 92                     uctime.source = lst;
 93 
 94                     _frmanchor = new forms.frmanchor(this, uctime);
 95                     _frmanchor.load += (a, b) => { (a as form).size = size; };
 96 
 97                     _frmanchor.show(this.findform());
 98 
 99                 }
100             }
101             else
102             {
103                 _frmanchor.close();
104             }
105         }
106         void uctime_selectsourceevent(object sender, eventargs e)
107         {
108             if (_frmanchor != null && !_frmanchor.isdisposed && _frmanchor.visible)
109             {
110                 _frmanchor.close();
111 
112                 if (btnclick != null)
113                 {
114                     btnclick(sender.tostring(), e);
115                 }
116             }
117         }
118     }
119 }

 1 namespace hzh_controls.controls.btn
 2 {
 3     partial class ucdropdownbtn
 4     {
 5         /// <summary> 
 6         /// 必需的设计器变量。
 7         /// </summary>
 8         private system.componentmodel.icontainer components = null;
 9 
10         /// <summary> 
11         /// 清理所有正在使用的资源。
12         /// </summary>
13         /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
14         protected override void dispose(bool disposing)
15         {
16             if (disposing && (components != null))
17             {
18                 components.dispose();
19             }
20             base.dispose(disposing);
21         }
22 
23         #region 组件设计器生成的代码
24 
25         /// <summary> 
26         /// 设计器支持所需的方法 - 不要
27         /// 使用代码编辑器修改此方法的内容。
28         /// </summary>
29         private void initializecomponent()
30         {
31             system.componentmodel.componentresourcemanager resources = new system.componentmodel.componentresourcemanager(typeof(ucdropdownbtn));
32             this.suspendlayout();
33             // 
34             // lbl
35             // 
36             this.lbl.font = new system.drawing.font("微软雅黑", 14f);
37             this.lbl.forecolor = system.drawing.color.white;
38             this.lbl.imagealign = system.drawing.contentalignment.middleright;
39             this.lbl.imagelist = null;
40             this.lbl.text = "自定义按钮";
41             this.lbl.textalign = system.drawing.contentalignment.middlecenter;
42             // 
43             // ucdropdownbtn
44             // 
45             this.autoscalemode = system.windows.forms.autoscalemode.none;
46             this.btnfont = new system.drawing.font("微软雅黑", 14f);
47             this.btnforecolor = system.drawing.color.white;
48             this.forecolor = system.drawing.color.white;
49             this.image = ((system.drawing.image)(resources.getobject("$this.image")));
50             this.imagealign = system.drawing.contentalignment.middleright;
51             this.margin = new system.windows.forms.padding(2);
52             this.name = "ucdropdownbtn";
53             this.resumelayout(false);
54 
55         }
56 
57         #endregion
58     }
59 }

 

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