GUI elements with Eto

[WileyNg]

Hi @cwensley

I have initiated a discussion in the forum here:
https://discourse.mcneel.com/t/custom-ui-elements-with-eto-forms/162955/21

Is there any possibility of receiving support for the Eto GUI elements?

Currently, we are employing a workaround to use a transparent Eto.Form by utilizing a WPF hack with styling, as shown below:

            Eto.Style.Add<Eto.Forms.Panel>(
            "transparent-form", control =>
            {
                var wpfwnd = (System.Windows.Window)control.ControlObject;
                wpfwnd.AllowsTransparency = true;

                wpfwnd.Background = swm.Brushes.Transparent;
                wpfwnd.Topmost = true;
                wpfwnd.ShowActivated = false;
                wpfwnd.WindowStyle = sw.WindowStyle.None;
            });

Since it's currently not possible to create a moduless form that can be attached to the viewport window at the moment, we are employing a convoluted way to hook the form to the viewport window.

        [DllImport("user32.dll", SetLastError = true)]
        public static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);
//hWndChild is created by the NativeHandle Property from each Control
//hWndNewParent is the active viewport window, found using the NativeHandle of the Rhino Application:
        [DllImport("user32")]
        [return: MarshalAs(UnmanagedType.Bool)]
        private static extern bool EnumChildWindows(IntPtr window, EnumedWindow callback, ArrayList lParam);

Is there a better way to accomplish this? The current method lacks stability since the functionality is not integrated into the Eto library.

[cwensley]

Hey @WileyNg, sorry for not responding earlier on this one. It would be really nice to have these features but the implementation of it (in the Rhino sense) is quite complicated as there are many different frameworks in play (native MFC, Cocoa, etc).

That being said, this issue combines two different problems into one so I've split it into #2746 and #2747 to have a clearer picture of what needs to be done.

Thank you again for your feedback.