[C#] 简单自绘带图片的 ComboBox - 精易论坛

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private void ComboBox1_DrawItem(object sender, DrawItemEventArgs e)
{
//鼠标选中在这个项上
if ((e.State & DrawItemState.Selected) != 0)
{
//渐变画刷
LinearGradientBrush brush = new LinearGradientBrush(e.Bounds, Color.FromArgb(255, 251, 237),
Color.FromArgb(255, 236, 181), LinearGradientMode.Vertical);
//填充区域
Rectangle borderRect = new Rectangle(3, e.Bounds.Y, e.Bounds.Width - 5, e.Bounds.Height - 2);
e.Graphics.FillRectangle(brush, borderRect);
//画边框
Pen pen = new Pen(Color.FromArgb(229, 195, 101));
e.Graphics.DrawRectangle(pen, borderRect);
}
else
{
SolidBrush brush = new SolidBrush(Color.FromArgb(255, 255, 255));
e.Graphics.FillRectangle(brush, e.Bounds);
}
//获得项图片,绘制图片
MyItem item = (MyItem)comboBox1.Items[e.Index];
Image img = item.Img;
//图片绘制的区域
Rectangle imgRect = new Rectangle(6, e.Bounds.Y + 3, 45,45);
e.Graphics.DrawImage(img, imgRect);
//文本内容显示区域
Rectangle textRect =
new Rectangle(imgRect.Right + 2, imgRect.Y, e.Bounds.Width - imgRect.Width, e.Bounds.Height - 2);
//获得项文本内容,绘制文本
String itemText = comboBox1.Items[e.Index].ToString();
//文本格式垂直居中
StringFormat strFormat = new StringFormat();
strFormat.LineAlignment = StringAlignment.Center;
e.Graphics.DrawString(itemText, new Font("微软雅黑", 12), Brushes.Black, textRect, strFormat);
}

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private void Form1_Load(object sender, EventArgs e)
{
//添加项
comboBox1.Items.Add(new MyItem("000000", Image.FromFile(Application.StartupPath + "\\0.gif")));
comboBox1.Items.Add(new MyItem("111111", Image.FromFile(Application.StartupPath + "\\1.gif")));
comboBox1.Items.Add(new MyItem("222222", Image.FromFile(Application.StartupPath + "\\2.gif")));
comboBox1.Items.Add(new MyItem("333333", Image.FromFile(Application.StartupPath + "\\3.gif")));
//默认选中项索引
comboBox1.SelectedIndex = 0;
//自绘组合框需要设置的一些属性
comboBox1.DrawMode = DrawMode.OwnerDrawFixed;
comboBox1.DropDownStyle = ComboBoxStyle.DropDownList;
comboBox1.ItemHeight = 50;
comboBox1.Width = 200;
//添加DrawItem事件处理函数
comboBox1.DrawItem += ComboBox1_DrawItem;
}

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