/// <include file='doc\FontDialog.uex' path='docs/doc[@for="FontDialog.RunDialog"]/*' />
/// <internalonly/>
/// <devdoc>
/// <para>
/// The actual implementation of running the dialog. Inheriting classes
/// should override this if they want to add more functionality, and call
/// base.runDialog() if necessary
///
/// </para>
/// </devdoc>
protected override bool RunDialog(IntPtr hWndOwner)
{
NativeMethods.WndProc hookProcPtr = new NativeMethods.WndProc(this.HookProc);
NativeMethods.CHOOSEFONT cf = new NativeMethods.CHOOSEFONT();
IntPtr screenDC = UnsafeNativeMethods.GetDC(NativeMethods.NullHandleRef);
NativeMethods.LOGFONT lf = new NativeMethods.LOGFONT();
Graphics graphics = Graphics.FromHdcInternal(screenDC);
try {
Font.ToLogFont(lf, graphics);
}
finally {
graphics.Dispose();
}
UnsafeNativeMethods.ReleaseDC(NativeMethods.NullHandleRef, new HandleRef(null, screenDC));
IntPtr logFontPtr = IntPtr.Zero;
try {
logFontPtr = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(NativeMethods.LOGFONT)));
Marshal.StructureToPtr(lf, logFontPtr, false);
cf.lStructSize = Marshal.SizeOf(typeof(NativeMethods.CHOOSEFONT));
cf.hwndOwner = hWndOwner;
cf.hDC = IntPtr.Zero;
cf.lpLogFont = logFontPtr;
cf.Flags = Options | NativeMethods.CF_INITTOLOGFONTSTRUCT | NativeMethods.CF_ENABLEHOOK;
if (minSize > 0 || maxSize > 0)
{
cf.Flags |= NativeMethods.CF_LIMITSIZE;
}
//if ShowColor=true then try to draw the sample text in color,
//if ShowEffects=false then we will draw the sample text in standard control text color regardless.
//(limitation of windows control)
//
if (ShowColor || ShowEffects)
{
cf.rgbColors = ColorTranslator.ToWin32(color);
}
else
{
cf.rgbColors = ColorTranslator.ToWin32(SystemColors.ControlText);
}
cf.lpfnHook = hookProcPtr;
cf.hInstance = UnsafeNativeMethods.GetModuleHandle(null);
cf.nSizeMin = minSize;
if (maxSize == 0)
{
cf.nSizeMax = int.MaxValue;
}
else
{
cf.nSizeMax = maxSize;
}
Debug.Assert(cf.nSizeMin <= cf.nSizeMax, "min and max font sizes are the wrong way around");
if (!SafeNativeMethods.ChooseFont(cf))
{
return(false);
}
NativeMethods.LOGFONT lfReturned = null;
lfReturned = (NativeMethods.LOGFONT)UnsafeNativeMethods.PtrToStructure(logFontPtr, typeof(NativeMethods.LOGFONT));
if (lfReturned.lfFaceName != null && lfReturned.lfFaceName.Length > 0)
{
lf = lfReturned;
UpdateFont(lf);
UpdateColor(cf.rgbColors);
}
return(true);
}
finally {
if (logFontPtr != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(logFontPtr);
}
}
}