/// <summary>
/// 绘制控件的背景。
/// </summary>
/// <param name="e"></param>
public virtual void DrawBackground(BackgroundRenderEventArgs e)
{
var control = e.Control as Control;
if (control == null)
{
return;
}
e.Graphics.Clear(control.BackColor);
if (control.BackgroundImage != null)
{
var imgRect = new Rectangle(0, 0, control.BackgroundImage.Width, control.BackgroundImage.Height);
var offsetRect = e.Bounds;
offsetRect.Offset(0, -e.Bounds.Y);
switch (control.BackgroundImageLayout)
{
case ImageLayout.None:
imgRect.Offset(0, e.Bounds.Y);
imgRect = GetImageRectByAlignment(e.Bounds, imgRect, e.Control.BackgroundImageAligment);
e.Graphics.DrawImage(control.BackgroundImage, imgRect);
break;
case ImageLayout.Tile:
for (var i = e.Bounds.X; i < e.Bounds.Width; i += imgRect.Width)
{
for (var j = e.Bounds.Y; j < e.Bounds.Height; j += imgRect.Height)
{
e.Graphics.DrawImage(control.BackgroundImage, new Rectangle(i, j, imgRect.Width, imgRect.Height));
}
}
break;
case ImageLayout.Stretch:
e.Graphics.DrawImage(control.BackgroundImage, e.Bounds);
break;
}
}
}
/// <summary>
/// 绘制 <see cref="TreeListItem"/> 的背景。
/// </summary>
/// <param name="e"></param>
protected virtual void DrawItemBackground(TreeListItemRenderEventArgs e)
{
//绘制背景图像
if (e.Item.TreeList.BackgroundImage != null)
{
e.Graphics.KeepClip(e.Bounds, () =>
{
var be = new BackgroundRenderEventArgs(e.Item.TreeList, e.Graphics, e.Item.TreeList.GetBoundSet().ItemBound);
ThemeManager.BaseRenderer.DrawBackground(be);
});
}
var backColor = GetItemBackgroundColor(e);
if (!backColor.IsEmpty)
{
using (var brush = new SolidBrush(backColor))
{
e.Graphics.FillRectangle(brush, e.Bounds);
}
}
}
