（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
<https://github.com/kwwwvagaa/NetWinformControl>

码云：https://gitee.com/kwwwvagaa/net_winform_custom_control.git
<https://gitee.com/kwwwvagaa/net_winform_custom_control.git>

如果觉得写的还行，请点个 star 支持一下吧

欢迎前来交流探讨： 企鹅群568015492 
<https://shang.qq.com/wpa/qunwpa?idkey=6e08741ef16fe53bf0314c1c9e336c4f626047943a8b76bac062361bab6b4f8d>

麻烦博客下方点个【推荐】，谢谢

NuGet
Install-Package HZH_Controls
目录

https://www.cnblogs.com/bfyx/p/11364884.html
<https://www.cnblogs.com/bfyx/p/11364884.html>

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 <https://www.cnblogs.com/bfyx/p/11361974.html>
，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
ImageAlign27 { 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) =>
{ (aas 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 } View Code 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 } View Code
 

最后的话

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