public static void SetCharFormatFont(this RichTextBox richTextBox, bool selectionOnly, Gdi32Font font)
{
IntPtr handle = richTextBox.Handle;
if (handle == IntPtr.Zero)
{
throw new InvalidOperationException();
}
int dwMask = -1476394993;
int num = 0;
if (font.Bold != BooleanConsts.FALSE)
{
num |= CFM_BOLD;
}
if (font.Italic != BooleanConsts.FALSE)
{
num |= CFM_ITALIC;
}
if (font.Underline != BooleanConsts.FALSE)
{
num |= CFM_UNDERLINE;
}
if (font.Strikeout != BooleanConsts.FALSE)
{
num |= CFM_STRIKEOUT;
}
byte[] bytes;
if (Marshal.SystemDefaultCharSize == 1)
{
throw new PlatformNotSupportedException();
}
bytes = Encoding.Unicode.GetBytes(font.Logfont.lfFaceName);
CHARFORMATW cHARFORMATW = new CHARFORMATW();
for (int j = 0; j < bytes.Length; j++)
{
cHARFORMATW.szFaceName[j] = bytes[j];
}
cHARFORMATW.dwMask = dwMask;
cHARFORMATW.dwEffects = num;
cHARFORMATW.yHeight = (int)(font.SizeInPoints * 20f);
cHARFORMATW.bCharSet = font.Logfont.lfCharSet;
cHARFORMATW.bPitchAndFamily = font.Logfont.lfPitchAndFamily;
SendMessage(new HandleRef(richTextBox, handle), EM_SETCHARFORMAT, selectionOnly ? SCF_SELECTION : SCF_ALL, cHARFORMATW);
}
public unsafe void CharFormat_FaceName()
{
CHARFORMATW charFormat = default;
charFormat.FaceName = "TwoFace";
Assert.Equal("TwoFace", charFormat.FaceName.ToString());
// Set a smaller name to make sure it gets terminated properly.
charFormat.FaceName = "Face";
Assert.Equal("Face", charFormat.FaceName.ToString());
// CHARFORMAT has space for 32 characters, we want to see it gets
// cut to 31 to make room for the null.
string bigString = new string('*', 32);
charFormat.FaceName = bigString;
Assert.True(charFormat.FaceName.SequenceEqual(bigString.AsSpan().Slice(1)));
}
public static extern IntPtr SendMessage(HandleRef hWnd, int msg, int wParam, [MarshalAs(UnmanagedType.LPStruct)][In][Out] CHARFORMATW lParam);
