public void DwmEnableBlurBehindWindowTest()
{
var wnd = new Form {
Size = new Size(50, 50), TopMost = true, ControlBox = false, FormBorderStyle = FormBorderStyle.None
};
wnd.Show();
Thread.Sleep(1000);
var bb = new DWM_BLURBEHIND(true);
var err = DwmEnableBlurBehindWindow(wnd.Handle, bb);
Assert.That(err.Succeeded);
Thread.Sleep(1000);
using (var g = wnd.CreateGraphics())
using (var hrgn = Gdi32.CreateRectRgnIndirect(new RECT(0, 0, 20, 20)))
{
bb.hRgnBlur = hrgn;
bb.dwFlags |= DWM_BLURBEHIND_Mask.DWM_BB_BLURREGION;
err = DwmEnableBlurBehindWindow(wnd.Handle, bb);
Assert.That(err.Succeeded);
Thread.Sleep(1000);
}
var bb2 = new DWM_BLURBEHIND(false);
err = DwmEnableBlurBehindWindow(wnd.Handle, bb2);
Assert.That(err.Succeeded);
Thread.Sleep(1000);
wnd.Hide();
}
/// <summary>
/// Draw a themed background element.
/// </summary>
/// <param name="g">Graphics object reference.</param>
/// <param name="draw">Rectangle for drawing.</param>
/// <param name="exclude">Rectangle to exclude from drawing.</param>
/// <param name="part">Theme part.</param>
/// <param name="state">Theme state of part.</param>
public void DrawThemeBackground(Graphics g, Rectangle draw, Rectangle exclude, int part, int state)
{
if (IsControlThemed)
{
// Create a Win32 version of the drawing Rectangle
Win32.RECT drawWin32 = new Win32.RECT();
drawWin32.left = draw.X;
drawWin32.top = draw.Y;
drawWin32.right = draw.Right;
drawWin32.bottom = draw.Bottom;
// Create a Win32 version of the clipping Rectangle
Win32.RECT excludeWin32 = new Win32.RECT();
excludeWin32.left = exclude.X;
excludeWin32.top = exclude.Y;
excludeWin32.right = exclude.Right;
excludeWin32.bottom = exclude.Bottom;
// Get access to the underlying HDC
IntPtr hDC = g.GetHdc();
// Make a note of the original clipping region
IntPtr hOldClipRgn = IntPtr.Zero;
Gdi32.GetClipRgn(hDC, ref hOldClipRgn);
// Create region that excludes area from drawing rectangle
IntPtr hDrawRgn = Gdi32.CreateRectRgnIndirect(ref drawWin32);
IntPtr hExcludeRgn = Gdi32.CreateRectRgnIndirect(ref excludeWin32);
Gdi32.CombineRgn(hExcludeRgn, hDrawRgn, hExcludeRgn, (int)CombineFlags.RGN_DIFF);
// Define required clipping rectangle
Gdi32.SelectClipRgn(hDC, hExcludeRgn);
// Perform actual drawing work
Uxtheme.DrawThemeBackground(_hTheme, hDC, part, state, ref drawWin32, IntPtr.Zero);
// Put clipping region back again
Gdi32.SelectClipRgn(hDC, hOldClipRgn);
// Delete objects no longer needed
Gdi32.DeleteObject(hDrawRgn);
Gdi32.DeleteObject(hExcludeRgn);
// Must release the resource to prevent leaks!
g.ReleaseHdc(hDC);
}
}
protected static IntPtr CreateRectangleRegion(Rectangle rect, int indent)
{
Win32.RECT newWinRect = new Win32.RECT();
newWinRect.left = rect.Left;
newWinRect.top = rect.Top;
newWinRect.right = rect.Right;
newWinRect.bottom = rect.Bottom;
// Create region for whole of the new rectangle
IntPtr newOuter = Gdi32.CreateRectRgnIndirect(ref newWinRect);
// If the rectangle is to small to make an inner object from, then just use the outer
if ((indent <= 0) || (rect.Width <= indent) || (rect.Height <= indent))
{
return(newOuter);
}
newWinRect.left += indent;
newWinRect.top += indent;
newWinRect.right -= indent;
newWinRect.bottom -= indent;
// Create region for the unwanted inside of the new rectangle
IntPtr newInner = Gdi32.CreateRectRgnIndirect(ref newWinRect);
Win32.RECT emptyWinRect = new Win32.RECT();
emptyWinRect.left = 0;
emptyWinRect.top = 0;
emptyWinRect.right = 0;
emptyWinRect.bottom = 0;
// Create a destination region
IntPtr newRegion = Gdi32.CreateRectRgnIndirect(ref emptyWinRect);
// Remove the intersection of the outer and inner
Gdi32.CombineRgn(newRegion, newOuter, newInner, (int)Win32.CombineFlags.RGN_XOR);
// Remove unwanted intermediate objects
Gdi32.DeleteObject(newOuter);
Gdi32.DeleteObject(newInner);
// Return the resultant region object
return(newRegion);
}
private void ClipMaximizedRegion(IntPtr hwnd)
{
RECT winRC = GetMaxClientRect(hwnd);
Debug.WriteLine("max win rect=" + winRC + ", visible=" + User32.IsWindowVisible(hwnd));
IntPtr rectRgnIndirect = IntPtr.Zero;
try
{
rectRgnIndirect = Gdi32.CreateRectRgnIndirect(ref winRC);
_hasClip = User32.SetWindowRgn(hwnd, rectRgnIndirect, User32.IsWindowVisible(hwnd));
}
finally
{
if (rectRgnIndirect != IntPtr.Zero)
{
Gdi32.DeleteObject(rectRgnIndirect);
}
}
}
