1.C#美化Combox的源码
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;namespace BeautifyComboBox
{public partial class B_ComboBox : ComboBox{public B_ComboBox(){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public 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{TColor1 = 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{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{get { return TColor2Gradual; }set{TColor2Gradual = value;this.Invalidate();}}#endregionprivate void B_ComboBox_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.Color2Gradual, LinearGradientMode.BackwardDiagonal);//将单色与渐变色存入Brush数组中listBoxBrushes = new Brush[] { SolidB1, LinearG1, SolidB2, LinearG2 };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)];//用指定的画刷填充列表项范围所形成的矩形e.Graphics.FillRectangle(brush, e.Bounds);//判断当前项是否被选取中bool selected = ((e.State & DrawItemState.Selected) == DrawItemState.Selected) ? true : false;if (selected) //如果当前项被选中{e.Graphics.FillRectangle(new SolidBrush(ColorSelect), e.Bounds); //绘制当前项}//绘制当前项中的文本e.Graphics.DrawString(this.Items[e.Index].ToString(), this.Font, Brushes.Black, e.Bounds);}e.DrawFocusRectangle(); //绘制聚焦框}}
}
2.测试的窗体效果源码
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;namespace BeautifyComboBox
{public partial class Form1 : Form{public Form1(){InitializeComponent();}}
}
3.效果图
