public Size MeasureString(string text, int?maximumWidth, TextAlignment halign = TextAlignment.Left, VerticalTextAlignment valign = VerticalTextAlignment.Top, StringDrawingFlags flags = 0)
{
uint formatFlags = GDIConstants.DT_CALCRECT;
switch (halign)
{
case TextAlignment.Left: formatFlags |= GDIConstants.DT_LEFT; break;
case TextAlignment.Center: formatFlags |= GDIConstants.DT_CENTER; break;
case TextAlignment.Right: formatFlags |= GDIConstants.DT_RIGHT; break;
}
switch (valign)
{
case VerticalTextAlignment.Top: break; // there is no DT_* constant for top alignment
case VerticalTextAlignment.Center: formatFlags |= GDIConstants.DT_VCENTER; break;
case VerticalTextAlignment.Bottom: formatFlags |= GDIConstants.DT_BOTTOM; break;
}
if (flags.HasFlag(StringDrawingFlags.AddPathEllipsis))
{
formatFlags |= GDIConstants.DT_PATH_ELLIPSIS;
}
else if (flags.HasFlag(StringDrawingFlags.AddWordEllipsis))
{
formatFlags |= GDIConstants.DT_WORD_ELLIPSIS;
}
if (flags.HasFlag(StringDrawingFlags.BreakOnWords))
{
formatFlags |= GDIConstants.DT_WORDBREAK;
}
if (flags.HasFlag(StringDrawingFlags.ExpandTabCharacters))
{
formatFlags |= GDIConstants.DT_EXPANDTABS;
}
if (flags.HasFlag(StringDrawingFlags.IgnoreAmpersands))
{
formatFlags |= GDIConstants.DT_NOPREFIX;
}
Rect frame = new Rect();
frame.right = maximumWidth ?? int.MaxValue;
NativeMethods.DrawText(Handle, text, -1, ref frame, formatFlags);
return(new Size(frame.right, frame.bottom));
}
private static int GetGDIFlags(TextAlignment halign, VerticalTextAlignment valign, StringDrawingFlags flags)
{
int formatFlags = 0;
switch (halign)
{
case TextAlignment.Left: formatFlags |= GDIConstants.DT_LEFT; break;
case TextAlignment.Center: formatFlags |= GDIConstants.DT_CENTER; break;
case TextAlignment.Right: formatFlags |= GDIConstants.DT_RIGHT; break;
}
switch (valign)
{
case VerticalTextAlignment.Top: break; // there is no DT_* value for top alignmrnt
case VerticalTextAlignment.Center: formatFlags |= GDIConstants.DT_VCENTER; break;
case VerticalTextAlignment.Bottom: formatFlags |= GDIConstants.DT_BOTTOM; break;
}
if (flags.HasFlag(StringDrawingFlags.AddPathEllipsis))
{
formatFlags |= GDIConstants.DT_PATH_ELLIPSIS;
}
else if (flags.HasFlag(StringDrawingFlags.AddWordEllipsis))
{
formatFlags |= GDIConstants.DT_WORD_ELLIPSIS;
}
if (flags.HasFlag(StringDrawingFlags.BreakOnWords))
{
formatFlags |= GDIConstants.DT_WORDBREAK;
}
if (flags.HasFlag(StringDrawingFlags.ExpandTabCharacters))
{
formatFlags |= GDIConstants.DT_EXPANDTABS;
}
if (flags.HasFlag(StringDrawingFlags.IgnoreAmpersands))
{
formatFlags |= GDIConstants.DT_NOPREFIX;
}
return(formatFlags);
}
public int DrawText(string text, Rect frame, TextAlignment halign = TextAlignment.Left, VerticalTextAlignment valign = VerticalTextAlignment.Top, StringDrawingFlags flags = 0)
{
uint formatFlags = 0;
switch (halign)
{
case TextAlignment.Left: formatFlags |= GDIConstants.DT_LEFT; break;
case TextAlignment.Center: formatFlags |= GDIConstants.DT_CENTER; break;
case TextAlignment.Right: formatFlags |= GDIConstants.DT_RIGHT; break;
}
switch (valign)
{
case VerticalTextAlignment.Top: break; // there is no DT_* value for top alignmrnt
case VerticalTextAlignment.Center: formatFlags |= GDIConstants.DT_VCENTER; break;
case VerticalTextAlignment.Bottom: formatFlags |= GDIConstants.DT_BOTTOM; break;
}
if (flags.HasFlag(StringDrawingFlags.AddPathEllipsis))
{
formatFlags |= GDIConstants.DT_PATH_ELLIPSIS;
}
else if (flags.HasFlag(StringDrawingFlags.AddWordEllipsis))
{
formatFlags |= GDIConstants.DT_WORD_ELLIPSIS;
}
if (flags.HasFlag(StringDrawingFlags.BreakOnWords))
{
formatFlags |= GDIConstants.DT_WORDBREAK;
}
if (flags.HasFlag(StringDrawingFlags.ExpandTabCharacters))
{
formatFlags |= GDIConstants.DT_EXPANDTABS;
}
if (flags.HasFlag(StringDrawingFlags.IgnoreAmpersands))
{
formatFlags |= GDIConstants.DT_NOPREFIX;
}
return(NativeMethods.DrawText(Handle, text, -1, ref frame, formatFlags));
}
public Rect GetTextSize(GraphicsContext dc, int partId, int stateId, string text, Rect drawRect,
TextAlignment halign = TextAlignment.Left, VerticalTextAlignment valign = VerticalTextAlignment.Top, StringDrawingFlags flags = 0)
{
AssertPartDefined(partId, stateId);
int hr = NativeMethods.GetThemeTextExtent(Handle, dc.Handle, partId, stateId, text, -1, GetGDIFlags(halign, valign, flags), ref drawRect, out var extentRect);
if (hr != 0)
{
Marshal.ThrowExceptionForHR(hr);
}
return(extentRect);
}
