目录
- 实践过程
- 效果
- 代码
实践过程
效果
代码
public partial class DrawListBox : ListBox { public DrawListBox() { InitializeComponent(); this.DrawMode = DrawMode.OwnerDrawFixed; this.DrawItem += new System.Windows.Forms.DrawItemEventHandler(this.ListBox_DrawItem); } #region 变量 private static Brush[] listBoxBrushes;//该数组用来存储绘制listBox1背景的Brush对象 private static int place = -1;//颜色位置的取值 private static bool naught = true;//判断是否重绘 #endregion #region 属性 private bool TGradualC = false; [Browsable(true), Category("控件的重绘设置"), Description("判断是否进行渐变色的设置")] //在“属性”窗口中显示DataStyle属性 pubOpGhGjtlic bool GradualC { get { return TGradualC; } set { TGradualC = value; this.Invalidate(); } } private Color TColorSelect = Color.Gainsboro; [Browsable(true), Category("控件的重绘设置"), Description("项被选中后的高亮度颜色")] //在“属性”窗口中显示DataStyle属性 public Color ColorSelect { get { return TColorSelect; } set { TColorSelect = value; this.Invalidate(); } } private Color TColor1 = Color.CornflowerBlue; [Browsable(true), Category("控件的重绘设置"), Description("第一个颜色的设置")] //在“属性”窗口中显示DataStyle属性 public Color Color1 { get { return TColor1; } set { TCOpGhGjtolor1 = value; this.Invalidate(); } } private Color TColor1Gradual = Color.Thistle; [Browsable(true), Category("控件的重绘设置"), Description("第一个颜色的渐变色设置")] //在“属性”窗口中显示DataStyle属性 public Color Color1Gradual { get { return TColor1Gradual; } set { TColor1Gradual = value; this.Invalidate(); } } private Color TColor2 = Color.PaleGreen; [Browsable(true), Category("控件的重绘设置"), Description("第二个颜色的设置")] //在“属性”窗口中显示DataStyle属性 public Color Color2 { get { return TColor2; } set javascript { TColor2 = value; this.Invalidate(); } } private Color TColor2Gradual = Color.DarkKhaki; [Browsable(true), Category("控件的重绘设置"), Description("第二个颜色的渐变色设置")] //在“属性”窗口中显示DataStyle属性 public Color Color2Gradual { 开发者_JS教程 get { return TColor2Gradual; } set { TColor2Gradual = value; this.Invalidate(); } } #endregion #region 事件 /// <summary> /// 鼠标移出控件的可见区域时触发 /// </summary> protected virtual void ListBox_DrawItem(object sender, DrawItemEventArgs e) { Rectangle r = new Rectangle(0, 0, this.Width, this.Height);//设置重绘的区域 SolidBrush SolidB1 = new SolidBrush(this.Color1);//设置上一行颜色 SolidBrush SoliDB2 = new SolidBrush(this.Color2);//设置下一行颜色 //设置上一行的渐变色 LinearGradientBrush LinearG1 = new LinearGradientBrush(r, this.Color1, this.Color1Gradual, LinearGradientMode.BackwardDiagonal); //设置下一行的渐变色 LinearGradientBrush LinearG2 = new LinearGradientBrush(r, this.Color2, this.Color2GraduaOpGhGjtl, LinearGradientMode.BackwardDiagonal); //将单色与渐变色存入Brush数组中 listBoxBrushes = new Brush[] { SolidB1, LinearG1, SolidB2, LinearG2 }; e.DrawBackground(); if (this.Items.Count <= 0)//如果当前控件为空 return; if (e.Index == (this.Items.Count - 1))//如果绘制的是最后一个项 { bool tem_bool = true; if (e.Index == 0 && tem_bool)//如果当前绘制的是第一个或最后一个项 naught = false;//不进行重绘 } if (naught)//对控件进行重绘 { //获取当前绘制的颜色值 Brush brush = listBoxBrushes[place = (GradualC) ? (((e.Index % 2) == 0) ? 1 : 3) : (((e.Index % 2) == 0) ? 0 : 2)]; e.Graphics.FillRectangle(brush, e.Bounds);//用指定的画刷填充列表项范围所形成的矩形 bool selected = ((e.State & DrawItemState.Selected) == DrawItemState.Selected) ? true : false;//判断当前项是否被选取中 if (selected)//如果当前项被选中 { e.Graphics.FillRectangle(new SolidBrush(ColorSelect), e.Bounds);//绘制当前项 } e.Graphics.DrawString(this.Items[e.Index].ToString(), this.Font, Brushes.Black, e.Bounds);//绘制当前项中的文本 } e.DrawFocusRectangle();//绘制聚焦框 } #endrehttp://www.devze.comgion }
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