B4J Question How to assign hot key to button

[Artorius]

Hello.

I came across this thread https://www.b4x.com/android/forum/t...ng-key-of-its-first-letter.91294/#post-576908 and tried to use the same solution to binding "ESC" key to a button (or to be able to close the view with esc key). It does not work. Is it possible that reflection is not working for buttons?

BR
Artorius

 

[Lahksman]

Reflection should work. I implemented it as following.

Add a handler

Dim r As Reflector
r.Target = PaneGame
r.AddEventHandler("Pane_KeyPressed","javafx.scene.input.KeyEvent.KEY_PRESSED")

Consume the event

Private Sub Pane_KeyPressed_Event(e As Event)
    keyListener(e)
End Sub

keylistener (dunno if ESC is the correct keycode, I use it for the enter key)

Sub keyListener(e As Event)
    Dim KE As Reflector
    KE.Target = e
    Dim keycode As String
    keycode = KE.RunMethod("getCode")
    If keycode = "ESC" Then
        ...
    End If
End Sub

 

[stevel05]

If you check the JavaFX Docs for Button (https://docs.oracle.com/javase/8/javafx/api/javafx/scene/control/Button.html) there are two properties that allow you to set default actions when Esc and Enter are pressed on a form provided that the actions are not consumed elsewhere.

You can set them with JavaObject:

    Dim JO As JavaObject = btnEsc
    JO.RunMethod("setCancelButton",Array(True))  'If Esc pressed
    JO = btnDef
    JO.RunMethod("setDefaultButton",Array(True))  'If Enter pressed

Simple full example attached.

Hope this helps.

 

[Artorius]

Thank you both, now it works perfectly