下拉图像列表 [英] Drop-Down Image List

问题描述

我试图找到一个下拉式列表中的图像，我可以在我的程序中使用。它只需在工具提示每一个网格中显示一些图片，我需要能够获得最后挑哪一个了。例如（没有在它的标签栏）的：

I'm trying to find a dropdown-style list for images I can use in a program of mine. It just needs to display a few images in a grid with tooltips for each one, and I need to be able to get whichever one was last picked. For example (without the tab bar in it):

不幸的是我的货币预算是零，这意味着我不能购买任何控制。有没有免费的这个样子，或者我需要工作在做我自己？

Unfortunately my monetary budget is zero which means I can't purchase any controls. Are there any free ones like this, or will I need to work at making my own?

如果答案是后者，在那里，你也许能够给我这样的任何有用的链接，我可以开始工作，这个控制？

If the answer is the latter, are there any useful links you might be able to give me so I could start to work on a control for this?

推荐答案

可以从 System.Windows.Forms.ComboBox 继承你的类并覆盖保护的方法的OnDrawItem（DrawItemEventArgs E）

You can inherit your class from System.Windows.Forms.ComboBox and override the protected method OnDrawItem(DrawItemEventArgs e)

示例code：

public class ImageComboBox : ComboBox
{
   protected override void OnDrawItem(DrawItemEventArgs e)
   {
      // Get the item.
      var item = this.Items[e.Index] as string;
      if(item == null)
         return;

      // Get the coordinates to where to draw the image.
      int imageX = e.Bounds.X + 5;
      int imageY = (e.Bounds.Height - image.Height) / 2;

      // Draw image
      e.Graphics.DrawImage(image, new Point(imageX, imageY));

      // Draw text
      e.Graphics.DrawString(item, this.Font, new SolidBrush(Color.Black),
            new PointF(textX, textY);
   }
}

在code以上仅仅是一个快速和肮脏的例子，不应该使用，因为它是（应该不是例如创建一个新SolidBrush每个项目绘制时间），但我希望它会给你一个想法如何做到这一点。

The code above is only a quick and dirty example, and should not be used as it is (should not for example create a new SolidBrush each time the item is drawn), but I hope it will give you an idea of how to do it.

这篇关于下拉图像列表的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！