B4J Question Slider step

red30 · Nov 26, 2018

I use the slider (1..10) with the settings:

B4X:

    joSlider.RunMethod("setBlockIncrement", Array(0.3))
    joSlider.RunMethod("setMajorTickUnit", Array(1.0))
    joSlider.RunMethod("setMinorTickCount", Array(2))
    joSlider.RunMethod("setShowTickLabels", Array(True))
    joSlider.RunMethod("setShowTickMarks", Array(True))
    joSlider.RunMethod("setValueChanging", Array(True))
    joSlider.RunMethod("setSnapToTicks", Array(True))

I turn to Private Sub Slider1_ValueChange (Value As Double)for any slider shift. Can I do something to make the slider move only in steps?
1,1.33,1,66.1.99,2.33 and so on...
I do not want to go to Slider1_ValueChange at intermediate values

stevel05 · Nov 26, 2018

This will do what you want

B4X:

JoSlider.RunMethod("setSnapToTicks", Array(True))
    JoSlider.RunMethod("setBlockIncrement", Array(0.3))
    JoSlider.RunMethod("setMajorTickUnit", Array(1.0))
    JoSlider.RunMethod("setMinorTickCount", Array(2))
    JoSlider.RunMethod("setShowTickLabels", Array(True))
    JoSlider.RunMethod("setShowTickMarks", Array(True))

B4X:

Sub Slider1_ValueChange (Value As Double)
    Dim JO As JavaObject = Sender
    If JO.RunMethod("isValueChanging",Null) Then Return
    Log("New value: " & Value)
End Sub

setValueChanging is not required and is set by the system when needed.

red30 · Nov 26, 2018

Thank! But this only works after I release the mouse button. And how to make it so that when I pulled the mouse pointer, the values only changed according to the specified steps?

stevel05 · Nov 26, 2018

You would think that the setSnapToTicks method would do this, but it doesn't seem to work that way. https://stackoverflow.com/questions/38681664/how-to-make-javafx-slider-to-move-in-discrete-steps

red30 · Nov 27, 2018

That is, it is impossible to make the slider move only in steps?

DonManfred · Nov 27, 2018

red30 said:
it is impossible to make the slider move only in steps?

no?

Or in Java

B4X:

Slider slider = new Slider(1, 4, 1);
slider.setBlockIncrement(1);
slider.setMajorTickUnit(1);
slider.setMinorTickCount(0);
slider.setShowTickLabels(true);
slider.setSnapToTicks(true);

The key here is the snap to ticks option combined with a proper combination of tick units. This setting results in the following slider which can only be used to select values ranging from 1 to 4

red30 · Nov 27, 2018

DonManfred did not see this line:

B4X:

Slider slider = new Slider(1, 4, 1);

How to apply it in b4a?

red30 · Nov 27, 2018

The problem is that if I use:

B4X:

Slider slider = new Slider(1, 4, 1);
slider.setBlockIncrement(1);
slider.setMajorTickUnit(1);
slider.setMinorTickCount(0);
slider.setShowTickLabels(true);
slider.setSnapToTicks(true);

When I lead a slider between 1 and 2, I get to Slider_ValueChange. And I wanted it to stick only in numbers 1,2,3,4

klaus · Nov 27, 2018

For your example in post#1 you could use the code below, Value is in 1/3 steps:

B4X:

Private Sub sldTest_ValueChange (Value As Double)
    Private intValue As Int
    intValue = Value * 3 + 0.5
    Value = intValue / 3
    lblValue.Text = NumberFormat(Value, 1, 2)
End Sub

B4J Question Slider step

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