添加项目文件。
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Administrator
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using AntdUI;
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using System;
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using System.ComponentModel;
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using System.Drawing;
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using System.Drawing.Drawing2D;
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using System.Windows.Forms;
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namespace JinYuan.ControlLib
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{
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public partial class CustomComboBox : ComboBox
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{
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private Color darkBackColor = Color.FromArgb(30, 30, 30);
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private Color lightBackColor = Color.White;
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private Color darkForeColor = Color.White;
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private Color lightForeColor = Color.Black;
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private Color darkBorderColor = Color.FromArgb(64, 64, 64);
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private Color lightBorderColor = Color.FromArgb(217, 217, 217);
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private Color darkArrowColor = Color.White;
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private Color lightArrowColor = Color.Black;
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private Color darkWatermarkColor = Color.Gray;
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private Color lightWatermarkColor = Color.LightGray;
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private string watermarkText = string.Empty;
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[Category("行为")]
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public string WatermarkText
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{
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get { return watermarkText; }
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set
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{
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watermarkText = value;
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Invalidate();
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}
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}
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private int cornerRadius = 5; // 新增：控制圆角半径的字段
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[Category("外观")]
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[DefaultValue(5)]
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public int CornerRadius
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{
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get { return cornerRadius; }
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set
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{
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if (cornerRadius != value)
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{
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cornerRadius = value;
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Invalidate();
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}
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}
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}
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public CustomComboBox()
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{
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SetStyle(ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint | ControlStyles.OptimizedDoubleBuffer, true);
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DrawMode = DrawMode.OwnerDrawFixed;
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DropDownStyle = ComboBoxStyle.DropDownList;
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UpdateTheme(Config.IsDark);
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}
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public void UpdateTheme(bool isDark)
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{
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BackColor = isDark ? darkBackColor : lightBackColor;
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ForeColor = isDark ? darkForeColor : lightForeColor;
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Invalidate();
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}
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protected override void OnPaint(PaintEventArgs e)
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{
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using (var path = CreateRoundedRectangle(new Rectangle(0, 0, Width - 1, Height - 1), cornerRadius))
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{
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var g = e.Graphics;
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g.SmoothingMode = SmoothingMode.AntiAlias;
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var rect = new Rectangle(0, 0, Width - 1, Height - 1);
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var borderColor = Config.IsDark ? darkBorderColor : lightBorderColor;
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var arrowColor = Config.IsDark ? darkArrowColor : lightArrowColor;
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// Draw background
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using (var brush = new SolidBrush(BackColor))
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{
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g.FillPath(brush, path);
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}
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// Draw border
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using (var pen = new Pen(borderColor))
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{
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g.DrawPath(pen, path);
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}
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// Draw text or watermark
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var textRect = new Rectangle(cornerRadius, 2, Width - 20 - cornerRadius, Height - 4);
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var flags = TextFormatFlags.VerticalCenter | TextFormatFlags.Left;
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if (SelectedItem != null)
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{
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string displayText = GetCustomItemText(SelectedItem);
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using (var brush = new SolidBrush(ForeColor))
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{
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TextRenderer.DrawText(g, displayText, Font, textRect, ForeColor, flags);
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}
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}
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else if (!string.IsNullOrEmpty(watermarkText))
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{
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var watermarkColor = Config.IsDark ? darkWatermarkColor : lightWatermarkColor;
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TextRenderer.DrawText(g, watermarkText, Font, textRect, watermarkColor, flags);
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}
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// Draw arrow
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var arrowSize = 8;
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var arrowRect = new Rectangle(Width - arrowSize - 8 - cornerRadius, (Height - arrowSize) / 2, arrowSize, arrowSize);
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using (var brush = new SolidBrush(arrowColor))
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{
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Point[] arrow = {
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new Point(arrowRect.Left, arrowRect.Top),
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new Point(arrowRect.Right, arrowRect.Top),
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new Point(arrowRect.Left + arrowRect.Width / 2, arrowRect.Bottom)
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};
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g.FillPolygon(brush, arrow);
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}
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}
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}
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protected override void OnDrawItem(DrawItemEventArgs e)
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{
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if (e.Index < 0) return;
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// 设置下拉项的背景色
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Color backColor;
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Color textColor;
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if ((e.State & DrawItemState.Selected) == DrawItemState.Selected)
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{
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// 选中项的颜色
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backColor = Config.IsDark ? Color.FromArgb(45, 45, 45) : Color.FromArgb(230, 230, 230);
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textColor = Config.IsDark ? darkForeColor : lightForeColor;
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}
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else
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{
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// 未选中项的颜色
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backColor = Config.IsDark ? darkBackColor : lightBackColor;
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textColor = Config.IsDark ? darkForeColor : lightForeColor;
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}
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// 使用新的背景色绘制背景
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using (var backBrush = new SolidBrush(backColor))
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{
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e.Graphics.FillRectangle(backBrush, e.Bounds);
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}
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// 绘制文本
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if (e.Index >= 0)
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{
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string itemText = GetCustomItemText(Items[e.Index]);
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// 设置文本边距
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Rectangle textBounds = new Rectangle(
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e.Bounds.X + 5, // 左边距
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e.Bounds.Y,
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e.Bounds.Width - 10, // 右边距
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e.Bounds.Height
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);
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// 使用TextRenderer绘制文本以获得更好的文本渲染效果
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TextRenderer.DrawText(
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e.Graphics,
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itemText,
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Font,
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textBounds,
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textColor,
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TextFormatFlags.VerticalCenter | TextFormatFlags.Left
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);
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}
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// 如果有焦点，绘制焦点矩形
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if ((e.State & DrawItemState.Focus) == DrawItemState.Focus)
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{
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using (Pen focusPen = new Pen(Config.IsDark ? Color.FromArgb(70, 70, 70) : Color.FromArgb(180, 180, 180)))
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{
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e.Graphics.DrawRectangle(focusPen, new Rectangle(e.Bounds.X, e.Bounds.Y, e.Bounds.Width - 1, e.Bounds.Height - 1));
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}
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}
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}
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// 添加这个方法来处理下拉列表的外观
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protected override void WndProc(ref System.Windows.Forms.Message m)
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{
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if (m.Msg == 0x204E) // WM_CTLCOLORLISTBOX
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{
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// 获取下拉列表的句柄
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var hDC = m.WParam;
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var hListBox = m.LParam;
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using (Graphics g = Graphics.FromHdc(hDC))
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{
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// 设置下拉列表的背景色
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using (SolidBrush backBrush = new SolidBrush(Config.IsDark ? darkBackColor : lightBackColor))
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{
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g.FillRectangle(backBrush, this.DropDownRectangle);
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}
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}
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}
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base.WndProc(ref m);
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}
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// 获取下拉列表的矩形区域
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private Rectangle DropDownRectangle
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{
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get
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{
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return new Rectangle(0, 0, DropDownWidth, ItemHeight * Math.Max(Items.Count, 1));
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}
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}
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private string GetCustomItemText(object item)
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{
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if (item == null)
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return string.Empty;
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if (string.IsNullOrEmpty(DisplayMember))
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return item.ToString();
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PropertyDescriptor descriptor = TypeDescriptor.GetProperties(item).Find(DisplayMember, true);
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if (descriptor != null)
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return descriptor.GetValue(item)?.ToString() ?? string.Empty;
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return item.ToString();
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}
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public object GetSelectedValue()
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{
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if (SelectedItem == null)
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return null;
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if (string.IsNullOrEmpty(ValueMember))
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return SelectedItem;
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PropertyDescriptor descriptor = TypeDescriptor.GetProperties(SelectedItem).Find(ValueMember, true);
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if (descriptor != null)
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return descriptor.GetValue(SelectedItem);
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return null;
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}
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private GraphicsPath CreateRoundedRectangle(Rectangle bounds, int radius)
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{
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int diameter = radius * 2;
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Size size = new Size(diameter, diameter);
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Rectangle arc = new Rectangle(bounds.Location, size);
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GraphicsPath path = new GraphicsPath();
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if (radius == 0)
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{
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path.AddRectangle(bounds);
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return path;
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}
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// 左上角
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path.AddArc(arc, 180, 90);
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// 右上角
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arc.X = bounds.Right - diameter;
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path.AddArc(arc, 270, 90);
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// 右下角
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arc.Y = bounds.Bottom - diameter;
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path.AddArc(arc, 0, 90);
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// 左下角
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arc.X = bounds.Left;
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path.AddArc(arc, 90, 90);
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path.CloseFigure();
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return path;
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}
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}
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}
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