重绘MenuStrip控件
效果如图：
首先添加 CustomProfessionalRenderer类 用于重绘控件菜单样式
/// <summary> /// 自定义MenuStrip 控件菜单样式类 /// </summary> public class CustomProfessionalRenderer : ToolStripProfessionalRenderer { private Color _startColor = Color.White;//选中的渐变开始颜色 private Color _endCoolor = Color.Blue;//选中的渐变颜色结束值 public CustomProfessionalRenderer() : base() { } ////public CustomProfessionalRenderer(Color startColor, Color endColor) //// : base() ////{ //// _startColor = startColor; //// _endCoolor = endColor; ////} public Color StartColor { get { return _startColor; } set { _startColor = value; } } public Color EndColor { get { return _endCoolor; } set { _endCoolor = value; } } /// <summary> /// 获取圆角矩形区域 radius=直径 /// </summary> /// <param name="rect"></param> /// <param name="radius"></param> /// <returns></returns> public static GraphicsPath GetRoundedRectPath(Rectangle rect, int radius) { int diameter = radius; Rectangle arcRect = new Rectangle(rect.Location, new Size(diameter, diameter)); GraphicsPath path = new GraphicsPath(); // 左上角 path.AddArc(arcRect, 180, 90); // 右上角 arcRect.X = rect.Right - diameter; path.AddArc(arcRect, 270, 90); // 右下角 arcRect.Y = rect.Bottom - diameter; path.AddArc(arcRect, 0, 90); // 左下角 arcRect.X = rect.Left; path.AddArc(arcRect, 90, 90); path.CloseFigure(); return path; } /// <summary> /// 渲染背景 包括menustrip背景 toolstripDropDown背景 /// </summary> /// <param name="e"></param> protected override void OnRenderToolStripBackground(ToolStripRenderEventArgs e) { ToolStrip toolStrip = e.ToolStrip; Graphics g = e.Graphics; g.SmoothingMode = SmoothingMode.HighQuality;//抗锯齿 Rectangle bounds = e.AffectedBounds; LinearGradientBrush lgbrush = new LinearGradientBrush(new Point(0, 0), new Point(0, toolStrip.Height), Color.FromArgb(255, _startColor), Color.FromArgb(200, _endCoolor)); if (toolStrip is MenuStrip) { //由menuStrip的Paint方法定义 这里不做操作 } else if (toolStrip is ToolStripDropDown) { int diameter = 1;//直径 GraphicsPath path = new GraphicsPath(); Rectangle rect = new Rectangle(Point.Empty, toolStrip.Size); Rectangle arcRect = new Rectangle(rect.Location, new Size(diameter, diameter)); path.AddLine(0, 0, 10, 0); // 右上角 arcRect.X = rect.Right - diameter; path.AddArc(arcRect, 270, 90); // 右下角 arcRect.Y = rect.Bottom - diameter; path.AddArc(arcRect, 0, 90); // 左下角 arcRect.X = rect.Left; path.AddArc(arcRect, 90, 90); path.CloseFigure(); toolStrip.Region = new Region(path); g.FillPath(lgbrush, path); } else { base.OnRenderToolStripBackground(e); } } //渲染边框 不绘制边框 protected override void OnRenderToolStripBorder(ToolStripRenderEventArgs e) { //不调用基类的方法 屏蔽掉该方法 去掉边框 } //渲染箭头 更改箭头颜色 protected override void OnRenderArrow(ToolStripArrowRenderEventArgs e) { e.ArrowColor = _endCoolor; base.OnRenderArrow(e); } /// <summary> /// 渲染项 不调用基类同名方法 /// </summary> /// <param name="e"></param> protected override void OnRenderMenuItemBackground(ToolStripItemRenderEventArgs e) { Graphics g = e.Graphics; ToolStripItem item = e.Item; ToolStrip toolstrip = e.ToolStrip; //渲染顶级项 if (toolstrip is MenuStrip) { LinearGradientBrush lgbrush = new LinearGradientBrush(new Point(0, 0), new Point(0, item.Height), Color.FromArgb(255, _endCoolor), Color.FromArgb(255, _startColor)); if (e.Item.Selected)//选中 { GraphicsPath gp = GetRoundedRectPath(new Rectangle(new Point(0, 0), item.Size), 1); g.FillPath(lgbrush, gp); } if (item.Pressed)//按下 { //创建上面左右2圆角的矩形路径 GraphicsPath path = new GraphicsPath(); int diameter = 1; Rectangle rect = new Rectangle(Point.Empty, item.Size); Rectangle arcRect = new Rectangle(rect.Location, new Size(diameter, diameter)); // 左上角 path.AddArc(arcRect, 180, 90); // 右上角 arcRect.X = rect.Right - diameter; path.AddArc(arcRect, 270, 90); path.AddLine(new Point(rect.Width, rect.Height), new Point(0, rect.Height)); path.CloseFigure(); //填充路径 g.FillPath(lgbrush, path); //g.FillRectangle(Brushes.White, new Rectangle(Point.Empty, item.Size)); } } else if (toolstrip is ToolStripDropDown)//渲染下拉项 { g.SmoothingMode = SmoothingMode.HighQuality; LinearGradientBrush lgbrush = new LinearGradientBrush(new Point(0, 0), new Point(item.Width, 0), Color.FromArgb(255, _startColor), Color.FromArgb(255, _endCoolor)); if (item.Selected) { GraphicsPath gp = GetRoundedRectPath(new Rectangle(0, 0, item.Width, item.Height), 1); g.FillPath(lgbrush, gp); } } else { base.OnRenderMenuItemBackground(e); } } /// <summary> /// 渲染分界线 /// </summary> /// <param name="e"></param> protected override void OnRenderSeparator(ToolStripSeparatorRenderEventArgs e) { Graphics g = e.Graphics; LinearGradientBrush lgbrush = new LinearGradientBrush(new Point(0, 0), new Point(e.Item.Width, 0), _startColor, Color.FromArgb(0, _endCoolor)); g.FillRectangle(lgbrush, new Rectangle(3, e.Item.Height / 2, e.Item.Width, 1)); //base.OnRenderSeparator(e); } /// <summary> /// 渲染图片区域 下拉菜单左边的图片区域 /// </summary> /// <param name="e"></param> protected override void OnRenderImageMargin(ToolStripRenderEventArgs e) { // base.OnRenderImageMargin(e); //屏蔽掉左边图片竖条 } }
其次添加类 CustomMenuStripControl 继承MenuStrip类
public partial class CustomMenuStripControl : MenuStrip { private Color _startColor = Color.White;//选中的渐变开始颜色 private Color _endCoolor = Color.Blue;//选中的渐变颜色结束值 private CustomProfessionalRenderer render; public CustomMenuStripControl() { render = new CustomProfessionalRenderer(); this.Renderer = render; } [Category("wyl")] [Description("选中渐变开始的颜色")] public Color StartColor { get { return _startColor; } set { _startColor = value; render.StartColor = value; base.Invalidate(); } } [Category("wyl")] [Description("选中渐变结束的颜色")] public Color EndColor { get { return _endCoolor; } set { _endCoolor = value; render.EndColor = value; base.Invalidate(); } } }