/// <summary>
/// When overridden in a derived class, specifies a common dialog box.
/// </summary>
/// <returns>
/// true if the dialog box was successfully run; otherwise, false.
/// </returns>
/// <param name="hwndOwner">A value that represents the window handle of the owner window for the common dialog box. </param>
protected override bool RunDialog(IntPtr hwndOwner)
{
NativeMethods.LOGFONT lf;
NativeMethods.CHOOSEFONT cf;
IntPtr plf;
bool result;
int minSize;
int maxSize;
bool showColor;
lf = new NativeMethods.LOGFONT();
this.Font.ToLogFont(lf);
plf = Marshal.AllocHGlobal(Marshal.SizeOf(lf));
Marshal.StructureToPtr(lf, plf, false);
showColor = this.ShowColor || this.ShowEffects;
cf = new NativeMethods.CHOOSEFONT();
cf.lStructSize = Marshal.SizeOf(typeof(NativeMethods.CHOOSEFONT));
cf.Flags = this.GetFlags();
cf.hwndOwner = hwndOwner;
cf.lpfnHook = this.HookProc;
minSize = this.MinSize;
maxSize = this.MaxSize;
if (minSize > 0 || maxSize > 0)
{
cf.nSizeMin = minSize;
cf.nSizeMax = maxSize > 0 ? maxSize : int.MaxValue;
}
cf.rgbColors = ColorTranslator.ToWin32(showColor ? this.Color : Color.Black);
cf.lpLogFont = plf;
try
{
result = NativeMethods.ChooseFont(ref cf);
if (result)
{
// create a managed font from the updated LOGFONT
lf = (NativeMethods.LOGFONT)Marshal.PtrToStructure(plf, typeof(NativeMethods.LOGFONT));
if (!string.IsNullOrEmpty(lf.lfFaceName))
{
this.UpdateFont(lf);
}
// and update the color
if (showColor)
{
this.UpdateColor(cf.rgbColors);
}
}
}
finally
{
// always be freein' allocated memory!
Marshal.FreeHGlobal(plf);
}
return result;
}
public static extern bool ChooseFont([In][Out] NativeMethods.CHOOSEFONT cf);
