/// <summary>
/// 绘制列表子项
/// </summary>
/// <param name="g">绘图表面</param>
/// <param name="subItem">要绘制的子项</param>
/// <param name="rectSubItem">该子项的区域</param>
/// <param name="sb">画刷</param>
protected virtual void DrawSubItem(Graphics g, ChatListSubItem subItem, ref Rectangle rectSubItem, SolidBrush sb)
{
if (subItem.Equals(selectSubItem)) { //判断改子项是否被选中
rectSubItem.Height = (int)ChatListItemIcon.Large; //如果选中则绘制成大图标
sb.Color = this.subItemSelectColor;
g.FillRectangle(sb, rectSubItem);
DrawHeadImage(g, subItem, rectSubItem); //绘制头像
DrawLargeSubItem(g, subItem, rectSubItem); //绘制大图标 显示的个人信息
subItem.Bounds = new Rectangle(rectSubItem.Location, rectSubItem.Size);
return;
} else if (subItem.Equals(m_mouseOnSubItem))
sb.Color = this.subItemMouseOnColor;
else
sb.Color = this.subItemColor;
g.FillRectangle(sb, rectSubItem);
DrawHeadImage(g, subItem, rectSubItem);
if (iconSizeMode == ChatListItemIcon.Large) //没有选中则根据 图标模式绘制
DrawLargeSubItem(g, subItem, rectSubItem);
else
DrawSmallSubItem(g, subItem, rectSubItem);
subItem.Bounds = new Rectangle(rectSubItem.Location, rectSubItem.Size);
}