（四十八）c#Winform自定義控制元件-下拉按鈕
阿新 • • 發佈：2019-08-27
前提
入行已經7,8年了，一直想做一套漂亮點的自定義控制元件，於是就有了本系列文章。
GitHub：https://github.com/kwwwvagaa/NetWinformControl
碼雲：https://gitee.com/kwwwvagaa/net_winform_custom_control.git
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NuGet
Install-Package HZH_Controls
目錄
https://www.cnblogs.com/bfyx/p/11364884.html
用處及效果
準備工作
這個控制元件將繼承自（三）c#Winform自定義控制元件-有圖示的按鈕，如不瞭解，請移步檢視
開始
新增一個使用者控制元件UCDropDownBtn，繼承自UCBtnImg
處理一些屬性
1 Forms.FrmAnchor _frmAnchor;
2 private int _dropPanelHeight = -1;
3 public new event EventHandler BtnClick;
4 [Description("下拉框高度"), Category("自定義")]
5 public int DropPanelHeight
6 {
7 get { return _dropPanelHeight; }
8 set { _dropPanelHeight = value; }
9 }
10 private string[] btns ;
11 [Description("按鈕"), Category("自定義")]
12 public string[] Btns
13 {
14 get { return btns; }
15 set { btns = value; }
16 }
17 [Obsolete("不再可用的屬性")]
18 [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
19 public override Image Image
20 {
21 get;
22 set;
23 }
24 [Obsolete("不再可用的屬性")]
25 [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
26 public override ContentAlignment ImageAlign
27 {
28 get;
29 set;
30 }點選時候顯示下拉框
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 }處理一下按鈕事件
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 }
完整程式碼
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("自定義")]
19 public int DropPanelHeight
20 {
21 get { return _dropPanelHeight; }
22 set { _dropPanelHeight = value; }
23 }
24 private string[] btns ;
25 [Description("按鈕"), Category("自定義")]
26 public string[] Btns
27 {
28 get { return btns; }
29 set { btns = value; }
30 }
31 [Obsolete("不再可用的屬性")]
32 [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
33 public override Image Image
34 {
35 get;
36 set;
37 }
38 [Obsolete("不再可用的屬性")]
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 }
View Code
1 namespace HZH_Controls.Controls.Btn
2 {
3 partial class UCDropDownBtn
4 {
5 /// <summary>
6 /// 必需的設計器變數。
7 /// </summary>
8 private System.ComponentModel.IContainer components = null;
9
10 /// <summary>
11 /// 清理所有正在使用的資源。
12 /// </summary>
13 /// <param name="disposing">如果應釋放託管資源，為 true；否則為 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 元件設計器生成的程式碼
24
25 /// <summary>
26 /// 設計器支援所需的方法 - 不要
27 /// 使用程式碼編輯器修改此方法的內容。
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("微軟雅黑", 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 = "自定義按鈕";
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("微軟雅黑", 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
最後的話
如果你喜歡的話，請到 https://gitee.com/kwwwvagaa/net_winform_custom_control 點個星