public static void SetAppBar(Window appbarWindow, ABEdge edge)
{
var info = GetRegisterInfo(appbarWindow);
info.Edge = edge;
var abd = new Interop.APPBARDATA();
abd.cbSize = Marshal.SizeOf(abd);
abd.hWnd = new WindowInteropHelper(appbarWindow).Handle;
int renderPolicy;
if (edge == ABEdge.None)
{
if (info.IsRegistered)
{
Interop.SHAppBarMessage((int)Interop.ABMsg.ABM_REMOVE, ref abd);
info.IsRegistered = false;
}
RestoreWindow(appbarWindow);
// Restore normal desktop window manager attributes
renderPolicy = (int)Interop.DWMNCRenderingPolicy.UseWindowStyle;
Interop.DwmSetWindowAttribute(abd.hWnd, (int)Interop.DWMWINDOWATTRIBUTE.DWMA_EXCLUDED_FROM_PEEK, ref renderPolicy, sizeof(int));
Interop.DwmSetWindowAttribute(abd.hWnd, (int)Interop.DWMWINDOWATTRIBUTE.DWMA_DISALLOW_PEEK, ref renderPolicy, sizeof(int));
return;
}
if (!info.IsRegistered)
{
info.IsRegistered = true;
info.CallbackId = Interop.RegisterWindowMessage("AppBarMessage");
abd.uCallbackMessage = info.CallbackId;
var ret = Interop.SHAppBarMessage((int)Interop.ABMsg.ABM_NEW, ref abd);
var source = HwndSource.FromHwnd(abd.hWnd);
source.AddHook(info.WndProc);
}
appbarWindow.WindowStyle = WindowStyle.None;
appbarWindow.ResizeMode = ResizeMode.NoResize;
appbarWindow.Topmost = true;
// Set desktop window manager attributes to prevent window
// from being hidden when peeking at the desktop or when
// the 'show desktop' button is pressed
renderPolicy = (int)Interop.DWMNCRenderingPolicy.Enabled;
Interop.DwmSetWindowAttribute(abd.hWnd, (int)Interop.DWMWINDOWATTRIBUTE.DWMA_EXCLUDED_FROM_PEEK, ref renderPolicy, sizeof(int));
Interop.DwmSetWindowAttribute(abd.hWnd, (int)Interop.DWMWINDOWATTRIBUTE.DWMA_DISALLOW_PEEK, ref renderPolicy, sizeof(int));
ABSetPos(info.Edge, appbarWindow);
}
private static void ABSetPos(ABEdge edge, Window appbarWindow)
{
var barData = new Interop.APPBARDATA();
barData.cbSize = Marshal.SizeOf(barData);
barData.hWnd = new WindowInteropHelper(appbarWindow).Handle;
barData.uEdge = (int)edge;
// Transforms a coordinate from WPF space to Screen space
var toPixel = PresentationSource.FromVisual(appbarWindow).CompositionTarget.TransformToDevice;
// Transforms a coordinate from Screen space to WPF space
var toWpfUnit = PresentationSource.FromVisual(appbarWindow).CompositionTarget.TransformFromDevice;
// Transform window size from wpf units (1/96 ") to real pixels, for win32 usage
var sizeInPixels = toPixel.Transform(new Vector(appbarWindow.ActualWidth, appbarWindow.ActualHeight));
// Even if the documentation says SystemParameters.PrimaryScreen{Width, Height} return values in
// "pixels", they return wpf units instead.
var screenSizeInPixels =
toPixel.Transform(new Vector(SystemParameters.PrimaryScreenWidth, SystemParameters.PrimaryScreenHeight));
if (barData.uEdge == (int)ABEdge.Left || barData.uEdge == (int)ABEdge.Right)
{
barData.rc.top = 0;
barData.rc.bottom = (int)screenSizeInPixels.Y;
if (barData.uEdge == (int)ABEdge.Left)
{
barData.rc.left = 0;
barData.rc.right = (int)Math.Round(sizeInPixels.X);
}
else
{
barData.rc.right = (int)screenSizeInPixels.X;
barData.rc.left = barData.rc.right - (int)Math.Round(sizeInPixels.X);
}
}
else
{
barData.rc.left = 0;
barData.rc.right = (int)screenSizeInPixels.X;
if (barData.uEdge == (int)ABEdge.Top)
{
barData.rc.top = 0;
barData.rc.bottom = (int)Math.Round(sizeInPixels.Y);
}
else
{
barData.rc.bottom = (int)screenSizeInPixels.Y;
barData.rc.top = barData.rc.bottom - (int)Math.Round(sizeInPixels.Y);
}
}
Interop.SHAppBarMessage((int)Interop.ABMsg.ABM_QUERYPOS, ref barData);
Interop.SHAppBarMessage((int)Interop.ABMsg.ABM_SETPOS, ref barData);
// transform back to wpf units, for wpf window resizing in DoResize.
var location = toWpfUnit.Transform(new Point(barData.rc.left, barData.rc.top));
var dimension = toWpfUnit.Transform(new Vector(barData.rc.right - barData.rc.left,
barData.rc.bottom - barData.rc.top));
var rect = new Rect(location, new Size(dimension.X, dimension.Y));
//This is done async, because WPF will send a resize after a new appbar is added.
//if we size right away, WPFs resize comes last and overrides us.
appbarWindow.Dispatcher.BeginInvoke(DispatcherPriority.ApplicationIdle,
new ResizeDelegate(DoResize), appbarWindow, rect);
}
