Detect shift-click in a script button?

[Midgardsormr]

I was asked to modify a script button on one of our tools such that its behavior is modified when it was shift-clicked. It doesn't look like it's possible to detect a key press in Lua without writing a new C module. Is there anything on the Fusion UI side that would let me send that information into the script as an argument?

At the moment, the easiest solution seems to be simply adding a second button for the alternate case, but I can imagine that being able to catch a key press would be useful.

[PeterLoveday]

It might be nice if the modifiers were passed to all events, but they're not (I assume you need this to work in 9.0.2).

It's not as clean as that would be, but you can detect keypresses:

Code: [Select all] [Expand/Collapse] [Download] (KeyPress.lua)

1. local ui = fu.UIManager
2. local disp = bmd.UIDispatcher(ui)
3.  
4. win = disp:AddWindow({
5.     ID = 'Win',
6.     Geometry = { 0, 0, 200, 50 },
7.     WindowTitle = 'KeyEvents',
8.     Events = { Close = true, KeyPress = true, KeyRelease = true, },
9.     ui:Button{ID = "Button", Text = "Button",},
10. })
11.  
12. itm = win:GetItems()
13.  
14. function win.On.Win.Close(ev)
15.     disp:ExitLoop()
16. end
17.  
18. -- A flag to track shift state
19. local shiftdown = false
20.  
21. -- If the shift key is pressed, set our flag
22. function win.On.Win.KeyPress(ev)
23.     if ev.Key == 0x1000020 then
24.         shiftdown = true
25.         itm.Button.Text = "Shift+Button"
26.     end
27. end
28.  
29. -- If the shift key is released, reset our flag
30. function win.On.Win.KeyRelease(ev)
31.     if ev.Key == 0x1000020 then
32.         shiftdown = false
33.         itm.Button.Text = "Button"
34.     end
35. end
36.  
37. -- Now we can use our flag to differentiate button presses
38. function win.On.Button.Clicked(ev)
39.     if shiftdown then
40.         print("Shift+Button")
41.     else
42.         print("Button")
43.     end
44. end
45.  
46. win:Show()
47. disp:RunLoop()
48. win:Hide()

[Midgardsormr]

Oh, interesting! I hadn't thought to look at Qt because I wasn't using any UI Manager in that particular script, but I think I can figure out how to use that. It's certainly more elegant than the nonsense I was considering calling Python, storing the state in the node's CustomData, and then recalling it in the Lua! That was so many levels of wrong I couldn't bring myself to even try it, although I'm reasonably sure it would work.

Thanks! I'll report back with my results.

[PeterLoveday]

Ah apologies, I misunderstood, you have a BTNCS_Execute control doing this? Hmm. Not sure that can be done. I'll have a look...

[Midgardsormr]

Alas, it looked like it would work, but it didn't.