Ctrl+Z doesn't work with Application Extension

Jack S wrote on 12/21/2023, 5:35 AM

@jetdv Edward, I have used the 'using (UndoBlock undo = ...' many times in my application extension. For some reason, I can't use Ctrl+Z to undo the action. Edit/Undo works, and Ctrl+Y reverses the undo. Have you any idea why Ctrl+Z doesn't work?
This is a sample

using (UndoBlock undo = new UndoBlock("Add Titles and Text Event"))
{
Apply_Plugin(lLen, ELen, PlugNme.Text, myFiOLen); //Call the sub-routine to apply the event
}
Am I missing something?

Comments

jetdv wrote on 12/21/2023, 8:46 AM

@Jack S, I just did a test. I performed an operation in Excalibur, hit CTRL-Z, and it undid the operation. So it should work fine. My only thought might be which window had the focus when you hit CTRL-Z? Perhaps VEGAS itself did not see it?

Jack S wrote on 12/21/2023, 8:49 AM

@jetdv You've got it. The timeline needs to have focus for it to work. Thanks.

EDIT. Correction. Either the timeline, preview or trimmer window needs to have focus.

Jack S wrote on 12/22/2023, 8:07 AM

@jetdv Edward, I wonder if you could help me again. WRT switching focus so that Ctrl+Z works, I found a reference in the API

void SetFocusToMainTrackView()

but I've no idea how to use it in my code block. I know where I want to put it, but I've tried using various references to get it to work. It's obviously not a case of simply entering that line. There must be some form of declaration that goes with it, but I can't figure that out. Any help would, as always, be appreciated.

jetdv wrote on 12/22/2023, 9:09 AM

@Jack S Here's how I do it in Excalibur. I set this external call up (just put it outside any other functions)

        [DllImport("USER32.DLL")]
        public static extern IntPtr SetFocus(HandleRef hWnd);

Then I call it with:

SetFocus(new HandleRef(null, myVegas.MainWindow.Handle));

Calling SetFocus then returns focus back to the main VEGAS window and allows all keypresses to go there instead of to the custom command. I use this mainly on the camera selection form in Excalibur where focus needs to go back to the timeline so the space bar can start/stop the playback but the clicks will still work to change the camera angles.

The command you listed above is part of the Dockable Control.

Jack S wrote on 12/23/2023, 8:18 AM

@jetdv Got there eventually. My first test was discovering that I had to include the
using System.Runtime.InteropServices; reference to be able to use the [DLLImport("USER32.DLL")] statement.
Although I new where to place the call statement, I wasn't sure where to put the external call. I tried several places unsuccessfully (I misunderstood your statement "just put it outside any other functions").
I finally found that I had to put it inside the UserControl block.
That did it. This tab now allows Ctrl+Z to work. I'll now proceed to put it into my other tabs.
Thanks again for pointing me in the right direction.

jetdv wrote on 12/23/2023, 8:25 AM

@Jack S Yes, I do have using System.Runtime.InteropServices; in that file.

And, yes, it does have to go inside the UserControl. Here's a little more context:

        [DllImport("USER32.DLL")]
        public static extern IntPtr SetFocus(HandleRef hWnd);

        private void ClickButton(object sender, EventArgs e)
        {

It's outside all functions but inside the UserControl. Glad to hear you got it working. As it *is* a function, it makes sense that it's outside all other functions.

Jack S wrote on 12/23/2023, 9:01 AM

@jetdv That bit of information is now in my scripting documentation. Thanks. On a side note, how do you get to enter that code in that oblong opaque frame in your comment? I haven't been able to figure that out yet.

jetdv wrote on 12/23/2023, 9:06 AM

@Jack S Paste it into this box. Highlight it, and the click on the "Insert Code" <> button at the top.

This will be put into the box!

Jack S wrote on 12/23/2023, 9:23 AM

@jetdv Got it. I have tried that before, but because the box wasn't grey, I thought, "that isn't it". It obviously goes grey after the comment is posted.
Thanks again.