DragMove() and Maximize

Question

I have a problem with my custom window (AllowTransparency, WindowStyle=None) in WPF. DragMove() method works good, but when I maximize window, or it maximizing automatically

Answer 1

In WPF I would highly recommend using Control.PointToScreen when restoring the window before your Window.DragMove. PointToScreen will also handle multiple monitor setups. This would simplify the restore to the following:

    private void OnMouseLeftButtonDown( object sender, MouseButtonEventArgs e )
    {
        if( e.ClickCount == 2 )
        {
            if( ResizeMode != ResizeMode.CanResize && 
                ResizeMode != ResizeMode.CanResizeWithGrip )
            {
                return;
            }

            WindowState = WindowState == WindowState.Maximized
                ? WindowState.Normal
                : WindowState.Maximized;
        }
        else
        {
            mRestoreForDragMove = WindowState == WindowState.Maximized;
            DragMove();
        }
    }

    private void OnMouseMove( object sender, MouseEventArgs e )
    {
        if( mRestoreForDragMove )
        {
            mRestoreForDragMove = false;

            var point = PointToScreen( e.MouseDevice.GetPosition( this ) );

            Left = point.X - ( RestoreBounds.Width * 0.5 );
            Top = point.Y;

            WindowState = WindowState.Normal;

            DragMove();
        }
    }

    private void OnMouseLeftButtonUp( object sender, MouseButtonEventArgs e )
    {
        mRestoreForDragMove = false;
    }

    private bool mRestoreForDragMove;