/// <summary>
/// Returns the Size of the given text using the specified font if not null, otherwise the font currently
/// set in the dc is used.
/// This method is used to get the size in points of a line of text; it uses GetTextExtentPoint32 function
/// which computes the width and height of the text ignoring TAB\CR\LF characters.
/// A text extent is the distance between the beginning of the space and a character that will fit in the space.
/// </summary>
public Size GetTextExtent(string text, WindowsFont font)
{
if (string.IsNullOrEmpty(text))
{
return(Size.Empty);
}
Size size = new Size();
if (font != null)
{
DeviceContext.SelectFont(font);
}
Gdi32.GetTextExtentPoint32W(DeviceContext.Hdc, text, text.Length, ref size);
// Unselect, but not from Measurement DC as it keeps the same
// font selected for perf reasons.
if (font != null && !MeasurementDCInfo.IsMeasurementDC(DeviceContext))
{
DeviceContext.ResetFont();
}
return(new Size(size.Width, size.Height));
}
