/// <summary>Called to create calculate the header height, when the header is horizontally oriented. The default
/// implementation measures the height of the title and subtitle text to determine the height of the header.
/// </summary>
protected virtual int CalculateHeaderHeight()
{
using(Graphics g = Graphics.FromHwnd(Handle))
{
int xOffset = 0, height = 0;
if(!string.IsNullOrEmpty(Title))
{
int fontHeight = (int)Math.Ceiling(TitleFont.GetHeight(g)), halfHeight = fontHeight/2;
xOffset += halfHeight;
height += fontHeight + halfHeight;
if(string.IsNullOrEmpty(Subtitle)) height += halfHeight;
}
if(!string.IsNullOrEmpty(Subtitle))
{
int fontHeight = (int)Math.Ceiling(SubtitleFont.GetHeight(g)), halfHeight = fontHeight/2;
int textHeight = (int)Math.Ceiling(g.MeasureString(Subtitle, SubtitleFont,
new Size(Width-xOffset-halfHeight*2, Height-height-halfHeight)).Height);
height += textHeight + halfHeight*2;
}
return Math.Max(60, height);
}
}
/// <summary>Draws the title and subtitle text. The default implementation places the text within the header if the
/// header is horizontal, or to the right of the header if the header is vertical.
/// </summary>
protected virtual void PaintTitleText(PaintEventArgs e)
{
using(Brush brush = new SolidBrush(TitleColor))
{
int xOffset = HeaderOrientation == Orientation.Horizontal ? 0 : HeaderSize, yOffset = 0;
if(!string.IsNullOrEmpty(Title))
{
int height = (int)Math.Ceiling(TitleFont.GetHeight(e.Graphics)), shift = height/2;
xOffset += shift;
yOffset += shift;
e.Graphics.DrawString(Title, TitleFont, brush, new Point(xOffset, yOffset));
yOffset += height;
}
if(!string.IsNullOrEmpty(Subtitle))
{
int shift = (int)Math.Ceiling(SubtitleFont.GetHeight(e.Graphics)) / 2;
xOffset += shift;
yOffset += shift;
e.Graphics.DrawString(Subtitle, SubtitleFont, brush,
new Rectangle(xOffset, yOffset, Width-xOffset-shift, Height-yOffset));
}
}
}
