protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
e.Graphics.CompositingQuality = CompositingQuality.HighQuality;
e.Graphics.DrawLine(new Pen(TabHeader.BottomLineColor), new Point(0, this.Bottom - 1), new Point(this.Width, this.Bottom - 1));
// 判断重绘区域大小，解决由最小化还原后，无法绘制Tab的问题
if (currPaintTh == null || e.ClipRectangle.Size.Width > TabHeader.Left_Offset)
{
// 被选中的Tab 需要处于顶层，因此最后绘制
TabHeader thSelected = null;
foreach (TabHeader th in lstTabHeader)
{
if (th.Selected)
{
thSelected = th;
}
else
{
th.DrawAll(e.Graphics, th.Rect);
}
}
// 最后绘制
if (thSelected != null)
{
thSelected.DrawAll(e.Graphics, thSelected.Rect);
}
}
else
{
// 绘制完整的TabHeader，如果仅绘制指定区域，可能会出现白色背景
currPaintTh.DrawAll(e.Graphics, currPaintTh.Rect);
currPaintTh = null;
}
}
protected override void OnMouseMove(MouseEventArgs e)
{
base.OnMouseMove(e);
if (e.Button == System.Windows.Forms.MouseButtons.Left && thMouseDown != null)
{
if (!slided)
{
if (Math.Abs(e.X - pMouseDown.X) > 15)
{
slided = true;
}
}
else
{
btnAddNew.Visible = false;
Point newPos = thMouseDown.Rect.Location;
newPos.X += e.Location.X - pMouseDown.X;
// 是否在父窗体范围内移动
if (newPos.X < 0)
{
newPos.X = 0;
}
if (newPos.X > this.Width - thMouseDown.Rect.Width)
{
newPos.X = this.Width - thMouseDown.Rect.Width;
}
// 判断移动方向，向左或向右
if (e.Location.X - pMouseDown.X > 0)
{
// 判断是否已经是最后一个Tab
if (thMouseDown.TabIndex != lstTabHeader.Count - 1)
{
TabHeader thRight = lstTabHeader[thMouseDown.TabIndex + 1];
// 向右移动时，判断是否与后一Tab 交换位置：当前Tab的 Right ,超过后一Tab 位置的一半
if (newPos.X + tabWidth > thRight.Rect.X + tabWidth / 2)
{
thRight.TabIndex--;
thMouseDown.TabIndex++;
lstTabHeader.Sort();
}
}
}
else
{
// 判断是否已经是第0个Tab
if (thMouseDown.TabIndex != 0)
{
TabHeader thLeft = lstTabHeader[thMouseDown.TabIndex - 1];
// 向右移动时，判断是否与后一Tab 交换位置：当前Tab的 Right ,超过后一Tab 位置的一半
if (newPos.X < thLeft.Rect.X + tabWidth / 2)
{
thLeft.TabIndex++;
thMouseDown.TabIndex--;
lstTabHeader.Sort();
}
}
}
thMouseDown.Rect.X = newPos.X;
pMouseDown = e.Location;
this.Invalidate();
}
}
else
{
this.Invalidate();
}
}
public int CompareTo(object o)
{
TabHeader th = o as TabHeader;
return(this.tabIndex.CompareTo(th.TabIndex));
}