public static bool DrawString(Graphics g,
Brush brush,
Rectangle rect,
RightToLeft rtl,
VisualOrientation orientation,
bool composition,
PaletteState state,
AccurateTextMemento memento)
{
Debug.Assert(g != null);
Debug.Assert(memento != null);
// Cannot draw with a null graphics instance
if (g == null)
throw new ArgumentNullException("g");
// Cannot draw with a null memento instance
if (memento == null)
throw new ArgumentNullException("memento");
bool ret = true;
// Is there a valid place to be drawn into
if ((rect.Width > 0) && (rect.Height > 0))
{
// Does the memento contain something to draw?
if (!memento.IsEmpty)
{
int translateX = 0;
int translateY = 0;
float rotation = 0f;
// Perform any transformations needed for orientation
switch (orientation)
{
case VisualOrientation.Bottom:
// Translate to opposite side of origin, so the rotate can
// then bring it back to original position but mirror image
translateX = rect.X * 2 + rect.Width;
translateY = rect.Y * 2 + rect.Height;
rotation = 180f;
break;
case VisualOrientation.Left:
// Invert the dimensions of the rectangle for drawing upwards
rect = new Rectangle(rect.X, rect.Y, rect.Height, rect.Width);
// Translate back from a quater left turn to the original place
translateX = rect.X - rect.Y - 1;
translateY = rect.X + rect.Y + rect.Width;
rotation = 270;
break;
case VisualOrientation.Right:
// Invert the dimensions of the rectangle for drawing upwards
rect = new Rectangle(rect.X, rect.Y, rect.Height, rect.Width);
// Translate back from a quater right turn to the original place
translateX = rect.X + rect.Y + rect.Height + 1;
translateY = -(rect.X - rect.Y);
rotation = 90f;
break;
}
// Apply the transforms if we have any to apply
if ((translateX != 0) || (translateY != 0))
g.TranslateTransform(translateX, translateY);
if (rotation != 0f)
g.RotateTransform(rotation);
try
{
if (composition)
DrawCompositionGlowingText(g, memento.Text, memento.Font, rect, state,
SystemColors.ActiveCaptionText, true);
else
g.DrawString(memento.Text, memento.Font, brush, rect, memento.Format);
}
catch
{
// Ignore any error from the DrawString, usually because the display settings
// have changed causing Fonts to be invalid. Our controls will notice the change
// and refresh the fonts but sometimes the draw happens before the fonts are
// regenerated. Just ignore message and everything will sort itself out. Trust me!
ret = false;
}
finally
{
// Remove the applied transforms
if (rotation != 0f)
g.RotateTransform(-rotation);
if ((translateX != 0) || (translateY != 0))
g.TranslateTransform(-translateX, -translateY);
}
}
}
return ret;
}
