使用 C# 组合框放置图像和字符串 [英] Placing Images and Strings with a C# Combobox

问题描述

我需要为 Windows 窗体应用程序创建一个下拉菜单或组合框，其中包含一个小图像，然后是旁边的一串文本.基本上，您可以认为下拉列表中的每一行都需要一个图标，然后是图标右侧的图标名称.我在做这件事时遇到了麻烦——事实上，我完全没有成功.有谁知道完成这项任务的方法?任何帮助将不胜感激.谢谢！

I need to create a dropdown menu, or combobox, for a Windows Forms application which contains a small image and then a string of text next to it. Basically, you can think of each 'row' in the dropdown as needing to have an icon and then the name of the icon to the right of the icon. I am having trouble doing this -- in fact, I've been completely unsuccessful. Does anyone know of a way to accomplish this task? Any help will be greatly appreciated. Thanks!

推荐答案

我能够想出一些非常简单的代码来执行此操作(请参阅下面的代码段).该代码创建了一个下拉控件，该控件在同一行中显示一个小的彩色方块和该颜色的名称(见图).感谢您在最初发布时为此提供的链接！希望此控件将来可以帮助其他人.

I was able to come up with some very simple code to perform this (see snippet below). The code creates a control that is a dropdown control which shows a small colored square and that color's name in the same row (see photo). Thanks for the links provided for this back when it was originally posted! Hopefully this control can help someone else out in the future.

图片:

代码:

class ColorSelector : ComboBox
{
    public ColorSelector()
    {
        DrawMode = DrawMode.OwnerDrawFixed;
        DropDownStyle = ComboBoxStyle.DropDownList;
    }
 
    // Draws the items into the ColorSelector object
    protected override void OnDrawItem(DrawItemEventArgs e)
    {
        e.DrawBackground();
        e.DrawFocusRectangle();
 
        DropDownItem item = new DropDownItem(Items[e.Index].ToString());
        // Draw the colored 16 x 16 square
        e.Graphics.DrawImage(item.Image, e.Bounds.Left, e.Bounds.Top);
        // Draw the value (in this case, the color name)
        e.Graphics.DrawString(item.Value, e.Font, new
                SolidBrush(e.ForeColor), e.Bounds.Left + item.Image.Width, e.Bounds.Top + 2);
 
        base.OnDrawItem(e);
    }
}
 
public class DropDownItem
{
    public string Value
    {
        get { return value; }
        set { this.value = value; }
    }
    private string value;
 
    public Image Image
    {
        get { return img; }
        set { img = value; }
    }
    private Image img;
 
    public DropDownItem() : this("")
    {}
 
    public DropDownItem(string val)
    {
        value = val;
        this.img = new Bitmap(16, 16);
        Graphics g = Graphics.FromImage(img);
        Brush b = new SolidBrush(Color.FromName(val));
        g.DrawRectangle(Pens.White, 0, 0, img.Width, img.Height);
        g.FillRectangle(b, 1, 1, img.Width - 1, img.Height - 1);
    }
 
    public override string ToString()
    {
        return value;
    }
}

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