簡體   English   中英

使用 C# 組合框放置圖像和字符串

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

我需要為 Windows 窗體應用程序創建一個下拉菜單或組合框,其中包含一個小圖像,然后是旁邊的一串文本。 基本上,您可以將下拉列表中的每一“行”視為需要有一個圖標,然后是圖標右側的圖標名稱。 我在做這件事時遇到了麻煩——事實上,我完全沒有成功。 有誰知道完成這項任務的方法? 任何幫助將不勝感激。 謝謝!

我能夠想出一些非常簡單的代碼來執行此操作(請參閱下面的代碼段)。 該代碼創建了一個控件,它是一個下拉控件,它在同一行中顯示一個小的彩色方塊和該顏色的名稱(見圖)。 感謝您在最初發布時為此提供的鏈接! 希望此控件可以在將來幫助其他人。

圖片:

下拉顏色選擇器


代碼:

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;
    }
}

非常有幫助..一些優化:

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:此代碼來自用戶 que dal 的優化如果您希望有一個不只是顏色名稱的字符串,請將 DropDownItem 更改為具有 2 個參數,即字符串和顏色,然后只需更改畫筆設置顏色的方式,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,您必須像這樣更改下拉項:

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

希望這有幫助:)

我解決了這個問題,我這樣做了:

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);

結果

不確定圖像,但這應該適用於字符串:

comboBox.Items.Add("String");

暫無
暫無

聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.

 
粵ICP備18138465號  © 2020-2024 STACKOOM.COM