（四十八）c#Winform自定义控件-下拉按钮

官网

http://www.hzhcontrols.com

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：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 

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

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

 Forms.FrmAnchor _frmAnchor;
         private int _dropPanelHeight = -;
         public new event EventHandler BtnClick;
         [Description("下拉框高度"), Category("自定义")]
         public int DropPanelHeight
         {
             get { return _dropPanelHeight; }
             set { _dropPanelHeight = value; }
         }
         private string[] btns ;
         [Description("按钮"), Category("自定义")]
         public string[] Btns
         {
             get { return btns; }
             set { btns = value; }
         }
         [Obsolete("不再可用的属性")]
         [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
         public override Image Image
         {
             get;
             set;
         }
         [Obsolete("不再可用的属性")]
         [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
         public override ContentAlignment ImageAlign
         {
             get;
             set;
         }

点击时候显示下拉框

 void UCDropDownBtn_BtnClick(object sender, EventArgs e)
         {
             if (_frmAnchor == null || _frmAnchor.IsDisposed || _frmAnchor.Visible == false)
             {

                 if (Btns != null && Btns.Length > )
                 {
                     int intRow = ;
                     int intCom = ;
                     var p = this.PointToScreen(this.Location);
                     while (true)
                     {
                         int intScreenHeight = Screen.PrimaryScreen.Bounds.Height;
                         if ((p.Y + this.Height + Btns.Length / intCom *  < intScreenHeight || p.Y - Btns.Length / intCom *  > )
                             && (_dropPanelHeight <=  ? true : (Btns.Length / intCom *  <= _dropPanelHeight)))
                         {
                             intRow = Btns.Length / intCom + (Btns.Length % intCom !=  ?  : );
                             break;
                         }
                         intCom++;
                     }
                     UCTimePanel ucTime = new UCTimePanel();
                     ucTime.IsShowBorder = true;
                     int intWidth = this.Width / intCom;

                     Size size = new Size(intCom * intWidth, intRow * );
                     ucTime.Size = size;
                     ucTime.FirstEvent = true;
                     ucTime.SelectSourceEvent += ucTime_SelectSourceEvent;
                     ucTime.Row = intRow;
                     ucTime.Column = intCom;

                     List<KeyValuePair<string, string>> lst = new List<KeyValuePair<string, string>>();
                     foreach (var item in Btns)
                     {
                         lst.Add(new KeyValuePair<string, string>(item, item));
                     }
                     ucTime.Source = lst;

                     _frmAnchor = new Forms.FrmAnchor(this, ucTime);
                     _frmAnchor.Load += (a, b) => { (a as Form).Size = size; };

                     _frmAnchor.Show(this.FindForm());

                 }
             }
             else
             {
                 _frmAnchor.Close();
             }
         }

处理一下按钮事件

 void ucTime_SelectSourceEvent(object sender, EventArgs e)
         {
             if (_frmAnchor != null && !_frmAnchor.IsDisposed && _frmAnchor.Visible)
             {
                 _frmAnchor.Close();

                 if (BtnClick != null)
                 {
                     BtnClick(sender.ToString(), e);
                 }
             }
         }

完整代码

 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Drawing;
 using System.Data;
 using System.Linq;
 using System.Text;
 using System.Windows.Forms;

 namespace HZH_Controls.Controls.Btn
 {
     [DefaultEvent("BtnClick")]
     public partial class UCDropDownBtn : UCBtnImg
     {
         Forms.FrmAnchor _frmAnchor;
         private int _dropPanelHeight = -;
         public new event EventHandler BtnClick;
         [Description("下拉框高度"), Category("自定义")]
         public int DropPanelHeight
         {
             get { return _dropPanelHeight; }
             set { _dropPanelHeight = value; }
         }
         private string[] btns ;
         [Description("按钮"), Category("自定义")]
         public string[] Btns
         {
             get { return btns; }
             set { btns = value; }
         }
         [Obsolete("不再可用的属性")]
         [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
         public override Image Image
         {
             get;
             set;
         }
         [Obsolete("不再可用的属性")]
         [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
         public override ContentAlignment ImageAlign
         {
             get;
             set;
         }

         public UCDropDownBtn()
         {
             InitializeComponent();
             IsShowTips = false;
             this.lbl.Image=Properties.Resources.ComboBox;
             this.lbl.ImageAlign = ContentAlignment.MiddleRight;
             base.BtnClick += UCDropDownBtn_BtnClick;
         }

         void UCDropDownBtn_BtnClick(object sender, EventArgs e)
         {
             if (_frmAnchor == null || _frmAnchor.IsDisposed || _frmAnchor.Visible == false)
             {

                 if (Btns != null && Btns.Length > )
                 {
                     int intRow = ;
                     int intCom = ;
                     var p = this.PointToScreen(this.Location);
                     while (true)
                     {
                         int intScreenHeight = Screen.PrimaryScreen.Bounds.Height;
                         if ((p.Y + this.Height + Btns.Length / intCom *  < intScreenHeight || p.Y - Btns.Length / intCom *  > )
                             && (_dropPanelHeight <=  ? true : (Btns.Length / intCom *  <= _dropPanelHeight)))
                         {
                             intRow = Btns.Length / intCom + (Btns.Length % intCom !=  ?  : );
                             break;
                         }
                         intCom++;
                     }
                     UCTimePanel ucTime = new UCTimePanel();
                     ucTime.IsShowBorder = true;
                     int intWidth = this.Width / intCom;

                     Size size = new Size(intCom * intWidth, intRow * );
                     ucTime.Size = size;
                     ucTime.FirstEvent = true;
                     ucTime.SelectSourceEvent += ucTime_SelectSourceEvent;
                     ucTime.Row = intRow;
                     ucTime.Column = intCom;

                     List<KeyValuePair<string, string>> lst = new List<KeyValuePair<string, string>>();
                     foreach (var item in Btns)
                     {
                         lst.Add(new KeyValuePair<string, string>(item, item));
                     }
                     ucTime.Source = lst;

                     _frmAnchor = new Forms.FrmAnchor(this, ucTime);
                     _frmAnchor.Load += (a, b) => { (a as Form).Size = size; };

                     _frmAnchor.Show(this.FindForm());

                 }
             }
             else
             {
                 _frmAnchor.Close();
             }
         }
         void ucTime_SelectSourceEvent(object sender, EventArgs e)
         {
             if (_frmAnchor != null && !_frmAnchor.IsDisposed && _frmAnchor.Visible)
             {
                 _frmAnchor.Close();

                 if (BtnClick != null)
                 {
                     BtnClick(sender.ToString(), e);
                 }
             }
         }
     }
 }

 namespace HZH_Controls.Controls.Btn
 {
     partial class UCDropDownBtn
     {
         /// <summary>
         /// 必需的设计器变量。
         /// </summary>
         private System.ComponentModel.IContainer components = null;

         /// <summary>
         /// 清理所有正在使用的资源。
         /// </summary>
         /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
         protected override void Dispose(bool disposing)
         {
             if (disposing && (components != null))
             {
                 components.Dispose();
             }
             base.Dispose(disposing);
         }

         #region 组件设计器生成的代码

         /// <summary>
         /// 设计器支持所需的方法 - 不要
         /// 使用代码编辑器修改此方法的内容。
         /// </summary>
         private void InitializeComponent()
         {
             System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(UCDropDownBtn));
             this.SuspendLayout();
             //
             // lbl
             //
             this.lbl.Font = new System.Drawing.Font("微软雅黑", 14F);
             this.lbl.ForeColor = System.Drawing.Color.White;
             this.lbl.ImageAlign = System.Drawing.ContentAlignment.MiddleRight;
             this.lbl.ImageList = null;
             this.lbl.Text = "自定义按钮";
             this.lbl.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
             //
             // UCDropDownBtn
             //
             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.None;
             this.BtnFont = new System.Drawing.Font("微软雅黑", 14F);
             this.BtnForeColor = System.Drawing.Color.White;
             this.ForeColor = System.Drawing.Color.White;
             this.Image = ((System.Drawing.Image)(resources.GetObject("$this.Image")));
             this.ImageAlign = System.Drawing.ContentAlignment.MiddleRight;
             this.Margin = new System.Windows.Forms.Padding();
             this.Name = "UCDropDownBtn";
             this.ResumeLayout(false);

         }

         #endregion
     }
 }

最后的话

如果你喜欢的话，请到 https://gitee.com/kwwwvagaa/net_winform_custom_control 点个星星吧