/// <summary>
/// 绘制列表项
/// </summary>
/// <param name="g">绘图表面</param>
/// <param name="item">要绘制的列表项</param>
/// <param name="rectItem">该列表项的区域</param>
/// <param name="sb">画刷</param>
protected virtual void DrawItem(Graphics g, ChatListItem item, Rectangle rectItem, SolidBrush sb)
{
StringFormat sf = new StringFormat();
sf.LineAlignment = StringAlignment.Center;
sf.SetTabStops(0.0F, new float[] { 20.0F });
if (item.Equals(m_mouseOnItem)) //根据列表项现在的状态绘制相应的背景色
sb.Color = this.itemMouseOnColor;
else
sb.Color = this.itemColor;
g.FillRectangle(sb, rectItem);
if (item.IsOpen) { //如果展开的画绘制 展开的三角形
sb.Color = this.arrowColor;
g.FillPolygon(sb, new Point[] {
new Point(2, rectItem.Top + 11),
new Point(12, rectItem.Top + 11),
new Point(7, rectItem.Top + 16) });
} else { //如果没有展开判断该列表项下面的子项闪动的个数
if (item.TwinkleSubItemNumber > 0) { //如果列表项下面有子项闪动 那么判断闪动状态 是否绘制或者不绘制
if (item.IsTwinkleHide) //该布尔值 在线程中不停 取反赋值
return;
}
sb.Color = this.arrowColor;
g.FillPolygon(sb, new Point[] {
new Point(5, rectItem.Top + 8),
new Point(5, rectItem.Top + 18),
new Point(10, rectItem.Top + 13) });
}
string strItem = "\t" + item.Text;
sb.Color = this.ForeColor;
sf.Alignment = StringAlignment.Near;
g.DrawString(strItem, this.Font, sb, rectItem, sf);
sf.Alignment = StringAlignment.Far;
//g.DrawString("[" + item.SubItems.GetOnLineNumber() + "/" + item.SubItems.Count + "]", this.Font, sb,
// new Rectangle(rectItem.X, rectItem.Y, rectItem.Width - 15, rectItem.Height), sf);
}
