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public
class
PopupNonTopmost : Popup
{
public
static
DependencyProperty TopmostProperty = Window.TopmostProperty.AddOwner(
typeof(PopupNonTopmost),
new
FrameworkPropertyMetadata(false, OnTopmostChanged));
public
bool
Topmost
{
get
{ return
(bool)GetValue(TopmostProperty); }
set
{ SetValue(TopmostProperty, value); }
}
private
static
void
OnTopmostChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)
{
(obj as
PopupNonTopmost).UpdateWindow();
}
protected
override
void
OnOpened(EventArgs e)
{
UpdateWindow();
}
private
void
UpdateWindow()
{
var
hwnd = ((HwndSource)PresentationSource.FromVisual(this.Child)).Handle;
RECT rect;
if
(GetWindowRect(hwnd, out
rect))
{
SetWindowPos(hwnd, Topmost ? -1 : -2, rect.Left, rect.Top, (int)this.Width, (int)this.Height, 0);
}
}
#region P/Invoke imports & definitions
[StructLayout(LayoutKind.Sequential)]
public
struct
RECT
{
public
int
Left;
public
int
Top;
public
int
Right;
public
int
Bottom;
}
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
private
static
extern
bool
GetWindowRect(IntPtr hWnd, out
RECT lpRect);
[DllImport("user32", EntryPoint = "SetWindowPos")]
private
static
extern
int
SetWindowPos(IntPtr hWnd, int
hwndInsertAfter, int
x, int
y, int
cx, int
cy, int
wFlags);
#endregion
}
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