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使用 C# 组合框放置图像和字符串

[英]Placing Images and Strings with a C# Combobox

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,您可以将下拉列表中的每一“行”视为需要有一个图标,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!

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)。 该代码创建了一个控件,它是一个下拉控件,它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! 希望此控件可以在将来帮助其他人。

图片:

下拉颜色选择器


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;
    }
}

非常有帮助..一些优化:

public sealed class ColorSelector : ComboBox
{
    public ColorSelector()
    {
        DrawMode = DrawMode.OwnerDrawFixed;
        DropDownStyle = ComboBoxStyle.DropDownList;
    }

    protected override void OnDrawItem(DrawItemEventArgs e)
    {
        e.DrawBackground();

        e.DrawFocusRectangle();

        if (e.Index >= 0 && e.Index < Items.Count)
        {
            DropDownItem item = (DropDownItem)Items[e.Index];

            e.Graphics.DrawImage(item.Image, e.Bounds.Left, e.Bounds.Top);

            e.Graphics.DrawString(item.Value, e.Font, new SolidBrush(e.ForeColor), e.Bounds.Left + item.Image.Width, e.Bounds.Top + 2);
        }

        base.OnDrawItem(e);
    }
}

和...

public sealed class DropDownItem
{
    public string Value { get; set; }

    public Image Image { get; set; }

    public DropDownItem()
        : this("")
    { }

    public DropDownItem(string val)
    {
        Value = val;
        Image = new Bitmap(16, 16);
        using (Graphics g = Graphics.FromImage(Image))
        {
            using (Brush b = new SolidBrush(Color.FromName(val)))
            {
                g.DrawRectangle(Pens.White, 0, 0, Image.Width, Image.Height);
                g.FillRectangle(b, 1, 1, Image.Width - 1, Image.Height - 1);
            }
        }
    }

    public override string ToString()
    {
        return Value;
    }
}

注意:此代码来自用户 que dal 的优化如果您希望有一个不只是颜色名称的字符串,请将 DropDownItem 更改为具有 2 个参数,即字符串和颜色,然后只需更改画笔设置颜色的方式,因此:

    public DropDownItem(string val, Color color)
    {
        Value = val;
        Image = new Bitmap(16, 16);
        using (Graphics g = Graphics.FromImage(Image))
        {
            using (Brush b = new SolidBrush(color))
            {
                g.DrawRectangle(Pens.White, 0, 0, Image.Width, Image.Height);
                g.FillRectangle(b, 1, 1, Image.Width - 1, Image.Height - 1);
            }
        }
    }

然后,您必须像这样更改下拉项:

    public DropDownItem()
        : this("", Color.Empty)
    {}

希望这有帮助:)

我解决了这个问题,我这样做了:

ComboBox MarcadorNS = new ComboBox(); MarcadorNS.Height = 30; MarcadorNS.Width = 150; MarcadorNS.SelectedValuePath = "Uid"; foreach (var temporalItem in GetPredefinedKinds()) { Image ImagenCombo = new Image(); ImagenCombo.Source = new BitmapImage(new Uri( "Imagenes/Marcadores/" + temporalItem.Name.ToLower() + ".png", UriKind.Absolute)); ImagenCombo.Height = 28; ImagenCombo.Width = 28; ImagenCombo.VerticalAlignment = VerticalAlignment.Top; ImagenCombo.HorizontalAlignment = HorizontalAlignment.Left; Label textoCombo = new Label(); textoCombo.VerticalAlignment = VerticalAlignment.Top; textoCombo.HorizontalAlignment = HorizontalAlignment.Left; textoCombo.Content = BaseDatos.NombresDeMarcadores(temporalItem.ToString()); Grid GridCombo = new Grid(); GridCombo.Uid = ObtenerMarcador(temporalItem.ToString()); StackPanel stackCombo = new StackPanel(); stackCombo.Orientation = Orientation.Horizontal; stackCombo.Children.Add(ImagenCombo); stackCombo.Children.Add(textoCombo); GridCombo.Children.Add(stackCombo); MarcadorNS.Items.Add(GridCombo);

结果

不确定图像,但这应该适用于字符串:

comboBox.Items.Add("String");

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