public void Update(Graphics g, string text, Font font, Padding internalBounds,
Rectangle bounds, Color color, TextFormatFlags formatFlags, IThemeTextOption[] options)
{
IntPtr compatHdc = this._TextHDC;
if (bounds.Equals(_TextHDCBounds)) {
//Same bounds, reuse HDC and Clear it
IntPtr hClearBrush = Native.GDI.CreateSolidBrush(ColorTranslator.ToWin32(Color.Black));
Native.RECT cleanRect = new Native.RECT(bounds);
Native.GDI.FillRect(compatHdc, ref cleanRect, hClearBrush);
Native.GDI.DeleteObject(hClearBrush);
}
else {
//Other bounds, create new HDC
IntPtr outputHdc = g.GetHdc();
IntPtr DIB;
compatHdc = CreateNewHDC(outputHdc, bounds, out DIB);
//Store new data
_TextHDC = compatHdc;
_TextHDCBounds = bounds;
//Clear up
CleanUpHDC(DIB);
g.ReleaseHdc(outputHdc);
}
DrawOnHDC(compatHdc, text, font, internalBounds, bounds, color, formatFlags, options);
}
public static ThemedText Create(Graphics g, string text, Font font, Padding internalBounds,
Rectangle bounds, Color color, TextFormatFlags formatFlags, IThemeTextOption[] options)
{
//Get HDC and create a compatible HDC
IntPtr outputHdc = g.GetHdc();
IntPtr DIB;
IntPtr compatHdc = CreateNewHDC(outputHdc, bounds, out DIB);
//Draw
DrawOnHDC(compatHdc, text, font, internalBounds, bounds, color, formatFlags, options);
//Clean up
CleanUpHDC(DIB);
g.ReleaseHdc(outputHdc);
//Return the wrapped HDC
return new ThemedText(compatHdc, bounds);
}
private static void DrawOnHDC(IntPtr compatHdc, string text, Font font, Padding internalBounds,
Rectangle bounds, Color color, TextFormatFlags formatFlags, IThemeTextOption[] options)
{
//Create the Font to use
IntPtr hFont = font.ToHfont();
Native.GDI.SelectObject(compatHdc, hFont);
//Get theme renderer
VisualStyleRenderer renderer = new VisualStyleRenderer(VisualStyleElement.Window.Caption.Active);
//Prepare options
NativeMethods.DTTOPTS dttOpts = new NativeMethods.DTTOPTS();
dttOpts.dwSize = Marshal.SizeOf(dttOpts);
dttOpts.dwFlags = NativeMethods.DTTOPSFlags.DTT_COMPOSITED | NativeMethods.DTTOPSFlags.DTT_TEXTCOLOR;
dttOpts.crText = ColorTranslator.ToWin32(color);
foreach (IThemeTextOption op in options)
op.Apply(ref dttOpts);
//Set full bounds with padding
Native.RECT RECT = new Native.RECT(internalBounds.Left, internalBounds.Top,
bounds.Width - internalBounds.Right, bounds.Height - internalBounds.Bottom);
//Draw
int ret = NativeMethods.DrawThemeTextEx(renderer.Handle, compatHdc, 0, 0, text, -1, (int)formatFlags, ref RECT, ref dttOpts);
if (ret != 0)
Marshal.ThrowExceptionForHR(ret);
//Clean up
Native.GDI.DeleteObject(hFont);
}
protected IThemeTextOption[] CreateOptions()
{
IThemeTextOption[] options = new IThemeTextOption[CountOptions()];
int curr = 0;
if (_glowEnable) {
options[curr] = new GlowOption(_glowSize);
++curr;
}
if (_shadowEnable) {
options[curr] = new ShadowOption(_shadowColor, _shadowOffset, _shadowType);
++curr;
}
if (!_overlayEnable) {
options[curr] = new OverlayOption(_overlayEnable);
++curr;
}
if (_borderEnable) {
options[curr] = new BorderOption(_borderColor, _borderSize);
++curr;
}
return options;
}
