/// <summary>
/// Draw text with a glowing background, for use on a composition element.
/// </summary>
/// <param name="g">Graphics reference.</param>
/// <param name="text">Text to be drawn.</param>
/// <param name="font">Font to use for text.</param>
/// <param name="bounds">Bounding area for the text.</param>
/// <param name="state">State of the source element.</param>
/// <param name="color">Color of the text.</param>
/// <param name="copyBackground">Should existing background be copied into the bitmap.</param>
public static void DrawCompositionGlowingText(Graphics g,
string text,
Font font,
Rectangle bounds,
PaletteState state,
Color color,
bool copyBackground)
{
try
{
// Get the hDC for the graphics instance and create a memory DC
IntPtr gDC = g.GetHdc();
IntPtr mDC = PI.CreateCompatibleDC(gDC);
PI.BITMAPINFO bmi = new PI.BITMAPINFO();
bmi.biSize = Marshal.SizeOf(bmi);
bmi.biWidth = bounds.Width;
bmi.biHeight = -(bounds.Height + GLOW_EXTRA_HEIGHT * 2);
bmi.biCompression = 0;
bmi.biBitCount = 32;
bmi.biPlanes = 1;
// Create a device independant bitmp and select into the memory DC
IntPtr hDIB = PI.CreateDIBSection(gDC, bmi, 0, 0, IntPtr.Zero, 0);
PI.SelectObject(mDC, hDIB);
if (copyBackground)
{
// Copy existing background into the bitmap
PI.BitBlt(mDC, 0, 0, bounds.Width, bounds.Height + GLOW_EXTRA_HEIGHT * 2,
gDC, bounds.X, bounds.Y - GLOW_EXTRA_HEIGHT, 0x00CC0020);
}
// Select the font for use when drawing
IntPtr hFont = font.ToHfont();
PI.SelectObject(mDC, hFont);
// Get renderer for the correct state
VisualStyleRenderer renderer = new VisualStyleRenderer(state == PaletteState.Normal ? VisualStyleElement.Window.Caption.Active :
VisualStyleElement.Window.Caption.Inactive);
// Create structures needed for theme drawing call
PI.RECT textBounds = new PI.RECT();
textBounds.left = 0;
textBounds.top = 0;
textBounds.right = (bounds.Right - bounds.Left);
textBounds.bottom = (bounds.Bottom - bounds.Top) + (GLOW_EXTRA_HEIGHT * 2);
PI.DTTOPTS dttOpts = new PI.DTTOPTS();
dttOpts.dwSize = Marshal.SizeOf(typeof(PI.DTTOPTS));
dttOpts.dwFlags = PI.DTT_COMPOSITED | PI.DTT_GLOWSIZE | PI.DTT_TEXTCOLOR;
dttOpts.crText = ColorTranslator.ToWin32(color);
dttOpts.iGlowSize = 11;
// Always draw text centered
TextFormatFlags textFormat = TextFormatFlags.SingleLine |
TextFormatFlags.HorizontalCenter |
TextFormatFlags.VerticalCenter |
TextFormatFlags.EndEllipsis;
// Perform actual drawing
PI.DrawThemeTextEx(renderer.Handle,
mDC, 0, 0,
text, -1, (int)textFormat,
ref textBounds, ref dttOpts);
// Copy to foreground
PI.BitBlt(gDC,
bounds.Left, bounds.Top - GLOW_EXTRA_HEIGHT,
bounds.Width, bounds.Height + (GLOW_EXTRA_HEIGHT * 2),
mDC, 0, 0, 0x00CC0020);
// Dispose of allocated objects
PI.DeleteObject(hFont);
PI.DeleteObject(hDIB);
PI.DeleteDC(mDC);
// Must remember to release the hDC
g.ReleaseHdc(gDC);
}
catch
{
}
}
internal static extern bool RedrawWindow(IntPtr hWnd, ref PI.RECT rectUpdate, IntPtr hRgnUpdate, uint uFlags);