新建一个用户控件：
直接上代码：
/*
* 作者：pengyan zhang
* 邮箱：[email protected]
* 博客：https://www.cnblogs.com/zpy1993-09
* 时间：2024-04-12 20:03
*/
public partial class UCDropControl : UserControl
{
#region 事件
/// <summary>
/// 委托
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
public delegate void DropEventHandler(object sender, DataEventArgs e);
/// <summary>
/// 开关状态发生改变时引发的事件
/// </summary>
public event DropEventHandler DrophEvent;
#endregion
#region 属性
[Category("SimpleUI"), Description("下拉框的边框颜色"), DefaultValue(typeof(Color), "138, 238, 238")]
public Color UC_BorderColor { get { return borderColor; } set { borderColor = value; Invalidate(); } }
private Color borderColor { get; set; } = Color.FromArgb(138, 238, 238);
[Category("SimpleUI"), Description("下拉框边框的大小"), DefaultValue(typeof(int), "5")]
public int UC_BorderSize { get { return borderSize; } set { borderSize = value; Invalidate(); } }
private int borderSize { get; set; } = 2;
[Category("SimpleUI"), Description("下拉框的默认Text")]
public string UC_Title { get { return Title; } set { Title = value; this.Drop_Title.Text = value; Invalidate(); } }
private string Title { get; set; } = "请选择";
[Category("SimpleUI"), Description("当鼠标进入下拉框子项，显示的颜色"), DefaultValue(typeof(Color), "0, 159, 149")]
public Color UC_EnterDropItemBackColor { get { return EnterDropItemBackColor; } set { EnterDropItemBackColor = value; } }
private Color EnterDropItemBackColor { get; set; } = Color.FromArgb(0, 159, 149);
[Category("SimpleUI"), Description("当鼠标离开时，或者默认颜色"), DefaultValue(typeof(Color), "255, 255, 255")]
public Color UC_LeaveDropItemBackColor { get { return LeaveDropItemBackColor; } set { LeaveDropItemBackColor = value; } }
private Color LeaveDropItemBackColor { get; set; } = Color.FromArgb(255, 255, 255);
[Category("SimpleUI"), Description("当鼠标进入的时候，字体颜色"), DefaultValue(typeof(int), "255, 255, 255")]
public Color UC_EnterDropItemFontColor { get { return EnterDropItemFontColor; } set { EnterDropItemFontColor = value; } }
private Color EnterDropItemFontColor { get; set; } = Color.FromArgb(255, 255, 255);
[Category("SimpleUI"), Description("当鼠标离开的时候，或者默认字体颜色"), DefaultValue(typeof(int), "0, 0,0")]
public Color UC_LeaveDropItemFontColor { get { return LeaveDropitemFontColor; } set { LeaveDropitemFontColor = value; } }
private Color LeaveDropitemFontColor { get; set; } = Color.FromArgb(0, 0, 0);
private int UCHeight { get; set; } = 30;
private FlowLayoutPanel flowLayoutPanel { get; set; }
private DropOption dropOption { get; set; }
public string DropName {
get {
if (dropOption == null) return this.Title;
return dropOption.Title;
}
}
public string DropValue
{
get
{
if (dropOption == null) return "";
return dropOption.Id.ToString();
}
}
#endregion
public UCDropControl()
{
InitializeComponent();
this.Drop_Back.Paint += Drop_Back_Paint;
Drop_Title.Click += Drop_Click;
Drop_Pic.Click += Drop_Click;
Drop_Title.MouseEnter += Drop_MouseEnter_Click;
Drop_Pic.MouseEnter += Drop_MouseEnter_Click;
this.Drop_Title.Text = this.Title;
}
public void SetDrop(List<DropOption> options)
{
//创建FlowLayoutPanel对象
flowLayoutPanel = new FlowLayoutPanel();
//放开滚动条
flowLayoutPanel.AutoScroll = true;
//禁止横向滚动条
SetScrollBar(flowLayoutPanel.Handle, 1, 0);//隐藏下、右滚动条
SetScrollBar(flowLayoutPanel.Handle, 0, 0);
//计算下拉框子项行高
int height = 0;
flowLayoutPanel.Width = this.Width;
if (options.Count > 0)
{
//定义子项
options.ForEach(item =>
{
//创建子项对象
Label label = new Label();
label.Tag = item;
label.Name = "DropItem";
label.AutoSize = false;
label.Height = this.Height;
label.Width = this.Width;
label.BackColor = LeaveDropItemBackColor;
label.ForeColor = LeaveDropitemFontColor;
if (item.dropType == DropType.文本和图标)
{
label.ImageAlign = ContentAlignment.MiddleLeft;
label.Image = item.image;
}
label.TextAlign = ContentAlignment.MiddleCenter;
if (item.dropType == DropType.字体图标)
{
label.UseCompatibleTextRendering = true;
label.Text = IconfontHelper.GetIconFont(item.StrImage) + " " + item.Title;
}
else label.Text = item.Title;
label.Click += Drop_Click;
label.MouseEnter += Drop_MouseEnter_Click;
label.MouseLeave += Drop_MouseLeave_Click;
label.Paint += DropItem_Paint;
height += this.Height;
flowLayoutPanel.Controls.Add(label);
});
}
//如果子项的高大于下拉框的4倍高度，某人为4倍高度
if (height > this.Height * 4) flowLayoutPanel.Height = this.Height * 4;
else flowLayoutPanel.Height = height;//如果小于4倍高度，那么就等于累计高度
}
private void DropItem_Paint(object? sender, PaintEventArgs e)
{
Control control = sender as Control;
ControlPaint.DrawBorder(e.Graphics,//获取进行绘制的图形
new Rectangle(0, 0, control.Width, control.Height),//绘制控件所在工作区域
Color.FromArgb(224, 224, 224), 1, ButtonBorderStyle.Solid,//边框类型，选择实线边框，也有虚线等种类；下面这四个重复的传参是设置工作区上下左右边框的功能
Color.FromArgb(224, 224, 224), 1, ButtonBorderStyle.Solid,
Color.FromArgb(224, 224, 224), 1, ButtonBorderStyle.Solid,
Color.FromArgb(224, 224, 224), 1, ButtonBorderStyle.Solid);
}
public void Drop_MouseLeave_Click(object? sender, EventArgs e)
{
var control = sender as Control;
control.BackColor = LeaveDropItemBackColor;
control.ForeColor = LeaveDropitemFontColor;
}
private void Drop_MouseEnter_Click(object? sender, EventArgs e)
{
var control = sender as Control;
control.Cursor = Cursors.Hand;
if (control.Name == "DropItem")
{
control.BackColor = EnterDropItemBackColor;
control.ForeColor = EnterDropItemFontColor;
}
}
private void Drop_Click(object? sender, EventArgs e)
{
if (flowLayoutPanel == null || flowLayoutPanel.Controls.Count == 0) return;
var control = sender as Control;
Popup pop;
switch (control.Name)
{
case "Drop_Title":
case "Drop_Pic":
pop = new Popup(flowLayoutPanel);
flowLayoutPanel.Tag = pop;
pop.Show(this);
break;
case "DropItem":
var drop = control.Tag as DropOption;
dropOption=drop;
this.Drop_Title.Text = drop.Title;
pop = flowLayoutPanel.Tag as Popup;
if (DrophEvent != null) DrophEvent.Invoke(control, new DataEventArgs(drop));
pop.Close();
break;
}
}
protected override void OnResize(EventArgs ea)
{
this.Height = this.UCHeight;
base.OnResize(ea);
}
private void Drop_Back_Paint(object? sender, PaintEventArgs e)
{
ControlPaint.DrawBorder(e.Graphics,//获取进行绘制的图形
new Rectangle(0, 0, Drop_Back.Width, Drop_Back.Height),//绘制控件所在工作区域
this.borderColor, this.borderSize, ButtonBorderStyle.Solid,//边框类型，选择实线边框，也有虚线等种类；下面这四个重复的传参是设置工作区上下左右边框的功能
this.borderColor, this.borderSize, ButtonBorderStyle.Solid,
this.borderColor, this.borderSize, ButtonBorderStyle.Solid,
this.borderColor, this.borderSize, ButtonBorderStyle.Solid);
}
#region 设置滚动条显示
[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern int ShowScrollBar(IntPtr hWnd, int bar, int show);
private class SubWindow : NativeWindow
{
private int m_Horz = 0;
private int m_Show = 0;
public SubWindow(int p_Horz, int p_Show)
{
m_Horz = p_Horz;
m_Show = p_Show;
}
protected override void WndProc(ref Message m_Msg)
{
ShowScrollBar(m_Msg.HWnd, m_Horz, m_Show);
base.WndProc(ref m_Msg);
}
}
/// <summary>
/// 设置滚动条是否显示
/// </summary>
/// <param name="p_ControlHandle">句柄</param>
/// <param name="p_Horz">0横 1列 3全部</param>
/// <param name="p_Show">0隐 1显</param>
public static void SetScrollBar(IntPtr p_ControlHandle, int p_Horz, int p_Show)
{
SubWindow _SubWindow = new SubWindow(p_Horz, p_Show);
_SubWindow.AssignHandle(p_ControlHandle);
}
#endregion
}
public class DropOption
{
public object Id { get; set; }
public DropType dropType { get; set; } = DropType.文本;
public Image image { get; set; }
public string Title { get; set; }
public string StrImage { get; set; }
}
public enum DropType
{
文本,
文本和图标,
字体图标
}
private void InitData()
{
var optlist = new List<DropOption>()
{
new DropOption(){Id="1",dropType=DropType.文本,Title="标题1"},
new DropOption(){Id="2",dropType=DropType.文本,Title="标题2"},
new DropOption(){Id="3",dropType=DropType.文本,Title="标题3"},
new DropOption(){Id="4",dropType=DropType.文本,Title="标题4"},
};
ucDropControl1.SetDrop(optlist);
}
效果：
标签：set,get,--,Drop,下拉菜单,Color,Title,public,winform From： https://www.cnblogs.com/zpy1993-09/p/18316037