public override object ConvertManagedToNative(object managedValue, Com2PropertyDescriptor pd, ref bool cancelSet)
{
// we default to black.
if (managedValue == null)
{
managedValue = Control.DefaultFont;
}
cancelSet = true;
if (_lastFont != null && _lastFont.Equals(managedValue))
{
// don't do anything here.
return(null);
}
_lastFont = (Font)managedValue;
Ole32.IFont nativeFont = (Ole32.IFont)pd.GetNativeValue(pd.TargetObject);
// now, push all the values into the native side
if (nativeFont != null)
{
bool changed = ControlPaint.FontToIFont(_lastFont, nativeFont);
if (changed)
{
// here, we want to pick up a new font from the handle
_lastFont = null;
ConvertNativeToManaged(nativeFont, pd);
}
}
return(null);
}
public IntPtr MarshalManagedToNative(object obj)
{
Font font = (Font)obj;
User32.LOGFONTW logFont = User32.LOGFONTW.FromFont(font);
var fontDesc = new Oleaut32.FONTDESC
{
cbSizeOfStruct = (uint)Marshal.SizeOf <Oleaut32.FONTDESC>(),
lpstrName = font.Name,
cySize = (long)(font.SizeInPoints * 10000),
sWeight = (short)logFont.lfWeight,
sCharset = logFont.lfCharSet,
fItalic = font.Italic.ToBOOL(),
fUnderline = font.Underline.ToBOOL(),
fStrikethrough = font.Strikeout.ToBOOL(),
};
Guid iid = typeof(Ole32.IFont).GUID;
Ole32.IFont oleFont = Oleaut32.OleCreateFontIndirect(ref fontDesc, ref iid);
IntPtr pFont = Marshal.GetIUnknownForObject(oleFont);
int hr = Marshal.QueryInterface(pFont, ref iid, out IntPtr pIFont);
Marshal.Release(pFont);
if (((HRESULT)hr).Failed())
{
Marshal.ThrowExceptionForHR(hr);
}
return(pIFont);
}
public object MarshalNativeToManaged(IntPtr pObj)
{
Ole32.IFont nativeFont = (Ole32.IFont)Marshal.GetObjectForIUnknown(pObj);
try
{
return(Font.FromHfont(nativeFont.hFont));
}
catch (Exception e) when(!ClientUtils.IsCriticalException(e))
{
return(DefaultFont);
}
}