protected override void OnPaint(PaintEventArgs e)
{
/*
********************
* *
* *
* +------------------+ *
* | /| /| /| | *
* | /-| /-| /-| | *
* | / | / | / | | *
* +------------------+ *
* *
**************************
**************************
*/
int left = 6;
Size size;
int drawableLength;
using (IGraphics g = Plat.Inst.GetGraphics(this))
{
g.BeginPaint(e.ClipRectangle);
// fill background
g.ForeColor = _TabLineColor;
g.BackColor = BackColor;
g.FillRectangle(0, 0, Width, Height);
g.DrawLine(0, Height - 1, Width, Height - 1);
// ensure capacity of x-coordinate array
if (_TabRightCoords == null ||
_TabRightCoords.Length < _Items.Count)
{
_TabRightCoords = new int[_Items.Count + 8]; // add little extra
}
// draw each tabs
for (int i = 0; i < _Items.Count; i++)
{
// make label text
string text = (string)_Items[i].ToString();
size = g.MeasureText(
text,
_MaxTabTextWidth,
out drawableLength
);
// if the label is too long to draw, cut it and add ellipsis
if (drawableLength < text.Length)
{
// measure width of text attached the ellipsis
size = g.MeasureText(
text,
_MaxTabTextWidth - _ElipsisWidth,
out drawableLength
);
text = text.Substring(0, drawableLength) + "...";
size.Width += _ElipsisWidth;
}
// if right end of the tab exceeds limit, stop drawing
if (Right - DropTipWidth <= left + size.Width + 8)
{
break;
}
// draw background of this tab
int w = size.Width;
int h = size.Height;
if (_Items[i].Equals(_SelectedItem))
{
// for selected tab, before drawing background
// draw a line to erase border between content area
g.ForeColor = _ActiveTabBackColor;
g.DrawLine(left + 1, Height - 1, left + w + 7, Height - 1);
g.BackColor = _ActiveTabBackColor;
}
else
{
g.BackColor = _TabBackColor;
}
g.FillRectangle(left + 1, Height - h - 3, w + 7, h + 2);
g.FillRectangle(left + 2, Height - h - 4, w + 4, 1);
// draw boundary
g.ForeColor = _TabLineColor;
g.DrawLine(left, Height - 1, left, Height - h - 2); // left
g.DrawLine(left, Height - h - 2, left + 3, Height - h - 5); // left-top
g.DrawLine(left + 3, Height - h - 5, left + w + 5, Height - h - 5); // top
g.DrawLine(left + w + 5, Height - h - 5, left + w + 8, Height - h - 2); // top-right
g.DrawLine(left + w + 8, Height - h - 2, left + w + 8, Height - 1); // right
// draw text on the tab
Point pos = new Point(left + 4, Height - size.Height - 2);
g.DrawText(text, ref pos, _TabTextColor);
// go to next tab
_TabRightCoords[i] = left + w + 8;
left += w + 8;
}
// draw line at left of triangle
int half = _HalfHeight;
int quarter = _QuarterHeight;
int oneEighth = _OneEighthHeight;
g.ForeColor = Color.Gray;
g.DrawLine(Right - DropTipWidth, 0, Right - DropTipWidth, Height);
// draw triangle
g.ForeColor = Color.Black;
for (int i = 0; i <= oneEighth + 1; i++)
{
g.DrawLine(
Right - half + i, Height - quarter - oneEighth + i,
Right - quarter - i + 1, Height - quarter - oneEighth + i
);
}
g.EndPaint();
}
}
