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 WinCustControls
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{
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public partial class UPanel : Panel
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{
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public UPanel()
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{
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InitializeComponent();
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SetStyle(ControlStyles.Selectable, true);
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SetStyle(ControlStyles.AllPaintingInWmPaint, true);//忽略窗口消息，减少闪烁
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SetStyle(ControlStyles.OptimizedDoubleBuffer, true);//绘制到缓冲区，减少闪烁
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SetStyle(ControlStyles.UserPaint, true);//控件由其自身而不是操作系统绘制
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SetStyle(ControlStyles.ResizeRedraw, true);//控件调整其大小时重绘
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SetStyle(ControlStyles.SupportsTransparentBackColor, true);//支持透明背景
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r = this.ClientRectangle;
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}
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private Color bgColor = Color.LightGray;
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/// <summary>
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/// 背景色1 （渐变颜色1）
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/// </summary>
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[DefaultValue(typeof(Color), "LightGray"), Description("控件的背景色1")]
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public Color BgColor
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{
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get { return bgColor; }
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set
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{
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bgColor = value;
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//Refresh();//立即重绘
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Invalidate();//引发重绘，不会立即执行
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}
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}
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private Color bgColor2 = Color.Transparent;
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/// <summary>
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/// 背景色2 （渐变颜色2）
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/// </summary>
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[DefaultValue(typeof(Color), "Transparent"), Description("控件的背景色2")]
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public Color BgColor2
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{
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get { return bgColor2; }
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set
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{
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bgColor2 = value;
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Invalidate();
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}
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}
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private Color borderColor = Color.Gray;
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/// <summary>
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/// 边框颜色
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/// </summary>
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[DefaultValue(typeof(Color), "Gray"), Description("控件的边框颜色")]
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public Color BorderColor
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{
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get { return borderColor; }
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set
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{
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borderColor = value;
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Invalidate();
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}
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}
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private int borderWidth = 0;
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/// <summary>
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/// 边框粗细
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/// </summary>
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[DefaultValue(typeof(int), "0"), Description("控件的边框粗细")]
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public int BorderWidth
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{
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get { return borderWidth; }
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set
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{
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borderWidth = value;
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Invalidate();
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}
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}
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private int radius = 5;
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/// <summary>
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/// 边框圆角半径
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/// </summary>
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[DefaultValue(typeof(int), "5"), Description("控件的边框圆角半径")]
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public int Radius
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{
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get { return radius; }
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set
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{
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radius = value;
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Invalidate();
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}
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}
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private LinearGradientMode gradientMode = LinearGradientMode.Vertical;
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/// <summary>
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/// 边框圆角半径
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/// </summary>
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[DefaultValue(typeof(LinearGradientMode), "Vertical"), Description("控件的背景渐变模式")]
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public LinearGradientMode GradientMode
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{
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get { return gradientMode; }
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set
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{
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gradientMode = value;
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Invalidate();
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}
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}
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Rectangle r;//绘制区域
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protected override void OnSizeChanged(EventArgs e)
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{
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base.OnSizeChanged(e);
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r = this.ClientRectangle;
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this.Region = new Region(r);
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r.Width -= 1;
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r.Height -= 1;
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}
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/// <summary>
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/// 重写绘制
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/// </summary>
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/// <param name="e"></param>
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protected override void OnPaint(PaintEventArgs e)
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{
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base.OnPaint(e);
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//绘制工作 边框 背景
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Graphics g = e.Graphics;//绘图对象
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//呈现质量--高质量呈现
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g.SmoothingMode = SmoothingMode.AntiAlias;
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GraphicsPath path1 = new GraphicsPath();//边框的圆角矩形
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GraphicsPath path2 = new GraphicsPath();//背景部分圆角矩形
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Rectangle rect;//内部填充的矩形
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if (radius > 0)
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{
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//生成外部矩形的圆角矩形路径
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path1 = PaintClass.GetRoundRectangle(r, radius);
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if (borderWidth > 0)
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{
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g.FillPath(new SolidBrush(borderColor), path1);//填充边框矩形
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//定义内部矩形结构
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rect = new Rectangle(r.X + borderWidth, r.Y + borderWidth, r.Width - 2 * borderWidth, r.Height - 2 * borderWidth);
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//生成内部矩形的圆角矩形路径
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path2 = PaintClass.GetRoundRectangle(rect, radius - 1);
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}
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else
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{
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path2 = path1;
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rect = r;
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}
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//背景色填充
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if (bgColor2 != Color.Transparent)
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{
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//渐变画刷
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LinearGradientBrush bgBrush = new LinearGradientBrush(rect, bgColor, bgColor2, gradientMode);
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g.FillPath(bgBrush, path2);//填充背景
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}
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else
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{
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Brush b = new SolidBrush(bgColor);
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g.FillPath(b, path2);
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}
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}
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else
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{
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if (borderWidth > 0)
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{
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g.FillRectangle(new SolidBrush(borderColor), r);//填充边框矩形
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//定义内部矩形结构
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rect = new Rectangle(r.X + borderWidth, r.Y + borderWidth, r.Width - 2 * borderWidth, r.Height - 2 * borderWidth);
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}
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else
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{
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rect = r;
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}
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//背景色填充
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if (bgColor2 != Color.Transparent)
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{
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//渐变画刷
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LinearGradientBrush bgBrush = new LinearGradientBrush(rect, bgColor, bgColor2, gradientMode);
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g.FillRectangle(bgBrush, rect);//填充背景
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}
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else
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{
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Brush b = new SolidBrush(bgColor);
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g.FillRectangle(b, rect);
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}
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}
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}
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}
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}
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