datagridview 文本和图像列类

最新推荐文章于 2024-04-23 17:30:16 发布

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本文介绍了一个自定义的DataGridView图文列组件实现方法。该组件允许在DataGridView中同时显示文本和图片，通过重写基类方法来绘制图像并调整单元格样式以适应图像大小。

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/// <summary>
/// datagridview 文本图像列
/// </summary>
public class TextAndImageColumn : DataGridViewTextBoxColumn
{
private Image imageValue;
private Size imageSize;

public TextAndImageColumn()
{
this.CellTemplate = new TextAndImageCell();
}

public override object Clone()
{
TextAndImageColumn c = base.Clone() as TextAndImageColumn;
c.imageValue = this.imageValue;
c.imageSize = this.imageSize;
return c;
}

public Image Image
{
get { return this.imageValue; }
set
{
if (this.Image != value)
{
this.imageValue = value;
this.imageSize = value.Size;

if (this.InheritedStyle != null)
{
Padding inheritedPadding = this.InheritedStyle.Padding;
this.DefaultCellStyle.Padding = new Padding(imageSize.Width, inheritedPadding.Top, inheritedPadding.Right, inheritedPadding.Bottom);
}
}
}
}
private TextAndImageCell TextAndImageCellTemplate
{
get { return this.CellTemplate as TextAndImageCell; }
}
internal Size ImageSize
{
get { return imageSize; }
}
}
/// <summary>
/// datagridview 文本图像单元格
/// </summary>
public class TextAndImageCell : DataGridViewTextBoxCell
{
private Image imageValue;
private Size imageSize;

public override object Clone()
{
TextAndImageCell c = base.Clone() as TextAndImageCell;
c.imageValue = this.imageValue;
c.imageSize = this.imageSize;
return c;
}

public Image Image
{
get
{
if (this.OwningColumn == null || this.OwningTextAndImageColumn == null)
{
return imageValue;
}
else if (this.imageValue != null)
{
return this.imageValue;
}
else
{
return this.OwningTextAndImageColumn.Image;
}
}
set
{
if (this.imageValue != value)
{
this.imageValue = value;
this.imageSize = value.Size;

//Padding inheritedPadding = this.InheritedStyle.Padding;
this.Style.Padding = new Padding(imageSize.Width, (this.GetSize(this.RowIndex).Height - this.imageSize.Height) / 2, 1, 1);

}
}
}
protected override void Paint(Graphics graphics, Rectangle clipBounds,
Rectangle cellBounds, int rowIndex, DataGridViewElementStates cellState,
object value, object formattedValue, string errorText,
DataGridViewCellStyle cellStyle,
DataGridViewAdvancedBorderStyle advancedBorderStyle,
DataGridViewPaintParts paintParts)
{
// Paint the base content
base.Paint(graphics, clipBounds, cellBounds, rowIndex, cellState,
value, formattedValue, errorText, cellStyle,
advancedBorderStyle, paintParts);

if (this.Image != null)
{
// Draw the image clipped to the cell.
System.Drawing.Drawing2D.GraphicsContainer container = graphics.BeginContainer();
graphics.SetClip(cellBounds);
graphics.DrawImageUnscaled(this.Image, new Point(cellBounds.Location.X, cellBounds.Location.Y + (cellBounds.Height - this.imageSize.Height) / 2));
graphics.EndContainer(container);
}

}

private TextAndImageColumn OwningTextAndImageColumn
{
get { return this.OwningColumn as TextAndImageColumn; }
}
}