有谁知道在 WinForms C# 中将背景图像插入到 ListBox 中的方法吗?

最佳答案

好吧,您必须从 ListBox 继承一个新控件。为此,在您的解决方案中创建一个“Windows 控件库”类型的新项目,并在文件控件的源代码文件中使用以下代码:

public partial class ListBoxWithBg : ListBox
{
   Image image;
   Brush brush, selectedBrush;

   public ListBoxWithBg()
   {
       InitializeComponent();

       this.DrawMode = DrawMode.OwnerDrawVariable;
       this.DrawItem += new DrawItemEventHandler(ListBoxWithBg_DrawItem);
       this.image = Image.FromFile("C:\\some-image.bmp");
       this.brush = new SolidBrush(Color.Black);
       this.selectedBrush = new SolidBrush(Color.White);
   }

   void ListBoxWithBg_DrawItem(object sender, DrawItemEventArgs e)
   {
       e.DrawBackground();
       e.DrawFocusRectangle();
       /* HACK WARNING: draw the last item with the entire image at (0,0)
        * to fill the whole ListBox. Really, there's many better ways to do this,
        * just none quite so brief */
       if (e.Index == this.Items.Count - 1)
       {
           e.Graphics.DrawImage(this.image, new Point(0, 0));
       }
       else
       {
           e.Graphics.DrawImage(this.image, e.Bounds, e.Bounds, GraphicsUnit.Pixel);
       }
       Brush drawBrush =
           ((e.State & DrawItemState.Selected) == DrawItemState.Selected)
           ? this.selectedBrush : this.brush;
       e.Graphics.DrawString(this.Items[e.Index].ToString(), this.Font, drawBrush, e.Bounds);
   }
}

为简洁起见,我省略了所有设计器代码等,但您必须记住在控件的 Dispose 方法中使用图像的 Dispose 和画笔。

关于c# - WinForm ListBox 背景设置,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/724132/

10-11 22:25
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