B4J Question Count Up/Count Down

[db0070]

I am trying to make a simple text box with up/down attached to it, so if the user presses 'up' the text box increments by one, and if the user presses 'down' it decrements by one.

I understand I could do this using two extra buttons, one controlling up and one controlling down. Is there a simpler way?

 

[jmon]

in the controlFX library there is a control already made for that

edit:

> Link to the project page: http://fxexperience.com/controlsfx/features/

> @Erel has written a library https://www.b4x.com/android/forum/threads/controlsfx-library.50700/ but it does'n't support this control yet. The source is included, so you can try to code it.

 

[Roycefer]

You can use the MouseClicked() event and increment if the left mouse button was clicked and decrement if the right mouse button was clicked.

 

[Daestrum]

You could use the spinner control.

 

[rwblinn]

Example TextField as Spinner Control using a JavaObject - not using ControlsFX.
Reference: https://docs.oracle.com/javase/8/javafx/api/javafx/scene/control/Spinner.html

SpinnerTextField defined as JavaObject:

Private joSpinner As JavaObject

'Add a SpinnerTextField to the RootPane
Sub AddSpinner
   Dim spMin As Double = 0
   Dim spMax As Double = 10
   Dim spInitialValue As Double = 5
   Dim spAmountToStepBy As Double = 1
   joSpinner.InitializeNewInstance("javafx.scene.control.Spinner", Array(spMin, spMax, spInitialValue, spAmountToStepBy))
   MainForm.RootPane.AddNode(joSpinner, 20, 100, 100, 20)
End Sub

'Get the value of the SpinnerTextField
Sub GetSpinnerValue As Double
   Return joSpinner.RunMethodJO("getValueFactory", Null).RunMethod("getValue", Null)
End Sub

'Set the value of the SpinnerTextField
Sub SetSpinnerValue(value As Double)
   joSpinner.RunMethodJO("getValueFactory", Null).RunMethod("setValue", Array(value))
End Sub

 

[db0070]

Thanks for that code, I will try it out later. If I understand this correctly, I will need a second spinner for the down count.

 

[rwblinn]

No need for a second spinner as the spinner handles by default both directions.

Pls find project attached.

 

[db0070]

I could not use the code as is, as I am targeting Android or iPhone. Anyway, I tried to modify the code using B4A, and it fails at this line

joSpinner.InitializeNewInstance("javafx.scene.control.Spinner", Array(spMin, spMax, spInitialValue, spAmountToStepBy))

I have added the JavaObject library.

 

[Daestrum]

As its for Android and not for B4J, I would look at NumberPicker here http://developer.android.com/reference/android/widget/NumberPicker.html