B4J Code Snippet KeyBoard Event,detect CTRL+X or etc...

B4X:
Private KEY_CTRL_PRESSED As Boolean = False

Sub AppStart (Form1 As Form, Args() As String)
    MainForm = Form1
    MainForm.RootPane.LoadLayout("Main") 'Load the layout file.
    MainForm.Show
    
    AddKeyPressedListener(MainForm)
End Sub

Sub AddKeyPressedListener(f As Form)
    f.RootPane.RequestFocus
    Dim r As Reflector
    r.Target = f.RootPane
    r.AddEventHandler("Main_KeyPressed", "javafx.scene.input.KeyEvent.KEY_PRESSED")
    r.AddEventHandler("Main_KeyPressed", "javafx.scene.input.KeyEvent.KEY_RELEASED")
End Sub

Private Sub Main_KeyPressed_Event(e As Event)
    Dim KE As Reflector
    KE.Target = e 'e is a KeyEvent instance
'    Dim KeyChar As String = KE.RunMethod("getCharacter")
    Dim KeyCode As String = KE.RunMethod("getCode")
'    Dim KeyText As String = KE.RunMethod("getText")
    Dim EventType As String = KE.RunMethod("getEventType")
    
    Log(EventType)
    
    Select EventType
        
        Case "KEY_PRESSED"
            Select KeyCode
                Case "ESCAPE"
                    Log("ESC")
                
                Case "CONTROL"
                    KEY_CTRL_PRESSED = True
                Case "X"
                    If KEY_CTRL_PRESSED Then
                        Log("CTRL+X PRESSED")
                        
                    End If
            End Select
        
    
        Case "KEY_RELEASED"
            If KeyCode = "CONTROL" Then
                KEY_CTRL_PRESSED = False
            End If
            
            
    End Select
    e.Consume
End Sub
 

YPMN

Member
Licensed User
hi behnam_tr, congratulations for your interesting work which was very useful to me. But then after adapting it to B4XPages, nothing works anymore, I'm lost. I suspect replacing:

B4X:
AddKeyPressedListener(MainForm)

in:

B4X:
AddKeyPressedListener(B4XPages.GetPage("B4XMainPage"))

How to adapt this line of code in B4XPages?
 

behnam_tr

Active Member
Licensed User
in b4j :
use codes in mainform

tested and works .
 

Attachments

  • Splash.zip
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YPMN

Member
Licensed User
Behnam_Tr, thanks very much! This example now allows me to correct and improve my understanding of how B4XPages works.
 
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