private void EstimateLines()
{
if (foundlineheight > 0) // already done
{
return;
}
int bordersize = (!BorderColor.IsFullyTransparent()) ? 3 : 0;
int textboxclienth = ClientRectangle.Height - bordersize * 2; // account for border
if (Text.HasChars() && Text.Contains("\n")) // we need text to sense it
{
int sl = TextBox.GetCharIndexFromPosition(new Point(0, 0));
sl = TextBox.GetLineFromCharIndex(sl);
for (int i = 1; i < ClientRectangle.Height; i++)
{
int nl = TextBox.GetCharIndexFromPosition(new Point(0, i)); // look to see when line changes.. it may not if only one line
nl = TextBox.GetLineFromCharIndex(nl);
if (sl != nl)
{
foundlineheight = i;
visiblelines = textboxclienth / i; // gotcha..
//System.Diagnostics.Debug.WriteLine("Found line h " + i + " giving " + visiblelines + " " + ((float)textboxclienth / i));
return;
}
}
}
visiblelines = textboxclienth / (int)(Font.GetHeight() + 1); // basic estimate
}
public int EstimateVerticalSizeFromText()
{
int lastselpos = this.Text.Length;
int numberlines = (lastselpos >= 0) ? (TextBox.GetLineFromCharIndex(lastselpos) + 1) : 0;
int bordersize = (!BorderColor.IsFullyTransparent()) ? 3 : 0;
int neededpixels = (int)(FontPixels() * numberlines) + bordersize * 2 + 4; // 4 extra for border area of this (bounds-client rect)
return(neededpixels);
}