using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace GDIDemo1
{
public partial class frmDrawItem : Form
{
public frmDrawItem()
{
InitializeComponent();
//指定绘制模式，这项必须指定为,OwnerDrawFixed,OwnerDrawVariable
//Normal 由操作系统绘制，并且元素大小都相等。
//OwnerDrawFixed 手动绘制的，并且元素大小都相等。
//OwnerDrawVariable 手动绘制，元素大小可能不相等。
comboBox2.DrawMode = DrawMode.OwnerDrawFixed;
}
private void frmDrawItem_Load(object sender, EventArgs e)
{
this.comboBox2.Items.Add("ss");
this.comboBox2.Items.Add("ss1");
this.comboBox2.SelectedIndex = 1;
this.comboBox1.Items.Add("ss");
this.comboBox1.Items.Add("ss1");
}
private void comboBox2_DrawItem(object sender, DrawItemEventArgs e)
{
//获取要在其上绘制项的图形表面
Graphics g = e.Graphics;
//获取表示所绘制项的边界的矩形
System.Drawing.Rectangle rect = e.Bounds;
//定义要绘制到控件中的图标图像
Image ico = Image.FromFile(@"C:\Users\qpj\Desktop\1.png");
//定义字体对象
System.Drawing.Font font = new System.Drawing.Font(new FontFamily("宋体"), 12);
if (e.Index >= 0)
{
//获得当前Item的文本
string tempString = comboBox2.Items[e.Index].ToString();
//如果当前项是没有状态的普通项
if (e.State == DrawItemState.None)
{
//在当前项图形表面上划一个矩形
g.FillRectangle(new SolidBrush(Color.FromArgb(200, 230, 255)), rect);
//在当前项图形表面上划上图标
g.DrawImage(ico, new Point(rect.Left, rect.Top));
//在当前项图形表面上划上当前Item的文本
g.DrawString(tempString, font, new SolidBrush(Color.Black), rect.Left + ico.Size.Width, rect.Top);
//将绘制聚焦框
e.DrawFocusRectangle();
}
else
{
e.Graphics.FillRectangle(new SolidBrush(Color.LightBlue), rect);
g.DrawImage(ico, new Point(rect.Left, rect.Top));
g.DrawString(tempString, font, new SolidBrush(Color.Black), rect.Left + ico.Size.Width, rect.Top);
e.DrawFocusRectangle();
}
}
}
}
}
