[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:
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);
不确定图像,但这应该适用于字符串:
comboBox.Items.Add("String");
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