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/