/// <summary>
/// Draw text without 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"><see cref="Color"/> of the text.</param>
/// <param name="copyBackground">Should existing background be copied into the bitmap.</param>
/// <param name="sf">StringFormat of the memento.</param>
public static void DrawCompositionText(Graphics g,
string text,
Font font,
Rectangle bounds,
PaletteState state,
Color color,
bool copyBackground,
StringFormat sf)
{
// Get the hDC for the graphics instance and create a memory DC
IntPtr gDC = g.GetHdc();
try
{
IntPtr mDC = PI.CreateCompatibleDC(gDC);
PI.BITMAPINFO bmi = new()
{
biWidth = bounds.Width,
biHeight = -bounds.Height,
biCompression = 0,
biBitCount = 32,
biPlanes = 1
};
bmi.biSize = (uint)Marshal.SizeOf(bmi);
// Create a device independent bitmap and select into the memory DC
IntPtr hDIB = PI.CreateDIBSection(gDC, ref bmi, 0, out _, IntPtr.Zero, 0);
PI.SelectObject(mDC, hDIB);
if (copyBackground)
{
// Copy existing background into the bitmap
PI.BitBlt(mDC, 0, 0, bounds.Width, bounds.Height,
gDC, bounds.X, bounds.Y, 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(state == PaletteState.Normal ? VisualStyleElement.Window.Caption.Active :
VisualStyleElement.Window.Caption.Inactive);
// Create structures needed for theme drawing call
PI.RECT textBounds = new()
{
left = 0,
top = 0,
right = bounds.Right - bounds.Left,
bottom = bounds.Bottom - bounds.Top
};
PI.DTTOPTS dttOpts = new()
{
dwSize = Marshal.SizeOf(typeof(PI.DTTOPTS)),
dwFlags = PI.DTT_COMPOSITED | PI.DTT_TEXTCOLOR,
crText = ColorTranslator.ToWin32(color)
};
// Always draw text centered
TextFormatFlags textFormat = TextFormatFlags.SingleLine |
TextFormatFlags.HorizontalCenter |
TextFormatFlags.VerticalCenter;
////Seb | TextFormatFlags.EndEllipsis;
// Perform actual drawing
//PI.DrawThemeTextEx(renderer.Handle,
// mDC, 0, 0,
// text, -1, (int)StringFormatToFlags(sf),
// ref textBounds, ref dttOpts);
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,
bounds.Width, bounds.Height,
mDC, 0, 0, 0x00CC0020);
// Dispose of allocated objects
PI.DeleteObject(hFont);
PI.DeleteObject(hDIB);
PI.DeleteDC(mDC);
}
catch
{
// ignored
}
finally
{
// Must remember to release the hDC
g.ReleaseHdc(gDC);
}
}
private void UpdateLayeredWindow(Rectangle rect)
{
// Cache the latest size and location
_showRect = rect;
// Must have a visible rectangle to render
if ((rect.Width > 0) && (rect.Height > 0))
{
// Draw onto a bitmap that is then used as the window display
Bitmap memoryBitmap = new Bitmap(rect.Width, rect.Height, PixelFormat.Format32bppArgb);
using (Graphics g = Graphics.FromImage(memoryBitmap))
{
// Perform actual painting onto the bitmap
Rectangle area = new Rectangle(0, 0, rect.Width, rect.Height);
using (RenderContext context = new RenderContext(null, g, area, _renderer))
{
_renderer.RenderGlyph.DrawDragDropDockingGlyph(context, _dragData, _paletteDragDrop, PaletteDragFeedback.Rounded);
}
// Get hold of the screen DC
IntPtr hDC = PI.GetDC(IntPtr.Zero);
// Create a memory based DC compatible with the screen DC
IntPtr memoryDC = PI.CreateCompatibleDC(hDC);
// Get access to the bitmap handle contained in the Bitmap object
IntPtr hBitmap = memoryBitmap.GetHbitmap(Color.FromArgb(0));
// Select this bitmap for updating the window presentation
IntPtr oldBitmap = PI.SelectObject(memoryDC, hBitmap);
// New window size
PI.SIZE ulwsize;
ulwsize.cx = rect.Width;
ulwsize.cy = rect.Height;
// New window position
PI.POINT topPos = new PI.POINT(rect.Left, rect.Top);
// Offset into memory bitmap is always zero
PI.POINT pointSource = new PI.POINT(0, 0);
// We want to make the entire bitmap opaque
PI.BLENDFUNCTION blend = new PI.BLENDFUNCTION
{
BlendOp = PI.AC_SRC_OVER,
BlendFlags = 0,
SourceConstantAlpha = 255,
AlphaFormat = PI.AC_SRC_ALPHA
};
// Tell operating system to use our bitmap for painting
PI.UpdateLayeredWindow(Handle, hDC, ref topPos, ref ulwsize,
memoryDC, ref pointSource, 0, ref blend,
PI.ULW_ALPHA);
// Put back the old bitmap handle
PI.SelectObject(memoryDC, oldBitmap);
// Cleanup resources
PI.ReleaseDC(IntPtr.Zero, hDC);
PI.DeleteObject(hBitmap);
PI.DeleteDC(memoryDC);
}
}
}
