WPF stop mouse down event gaining Application focus
In WinForms I used the following block of code to stop the application gaining focus by being clicked on:
private const int WM_MOUSEACTIVATE = 0x0021;
private const int MA_NOACTIVATEANDEAT = 0x0004;
protected override void WndProc(ref Message m)
{
if (m.Msg == WM_MOUSEACTIVATE)
{
m.Result = (IntPtr)MA_NOACTIVATEANDEAT;
return;
}
base.WndProc(ref m);
}
Is there any alternative to this in a WPF application? Can I use a HwndSource? Here is what I have so far (WM_MOUSEACTIVATE alone does not work as required and the application still gets focus):
protected override void OnSourceInitialized(EventArgs e)
{
base.OnSourceInitialized(e);
HwndSource source = PresentationSource.FromVisual(this) as HwndSource;
source.AddHook(WndProc);
}
private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
// Handle messages...
int WM_MOUSEACTIVATE = 0x0021;
int WM_LBUTTONDOWN = 0x0201; //513
int WM_LBUTTONUP = 0x0202; //514
int WM_LBUTTONDBLCLK = 0x0203; //515
if (msg == 开发者_如何转开发WM_MOUSEACTIVATE || msg == MA_NOACTIVATEANDEAT || msg == WM_LBUTTONDOWN || msg == WM_LBUTTONUP || msg == WM_LBUTTONDBLCLK)
{
handled = true;
}
return IntPtr.Zero;
}
How can I get the Message Result?
Resolved by using:
private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
// Handle messages...
int WM_MOUSEACTIVATE = 0x0021;
if (msg == WM_MOUSEACTIVATE )
{
handled = true;
return new IntPtr(MA_NOACTIVATEANDEAT);
}
return IntPtr.Zero;
}
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