Comments on: JavaFX Light Bulb with improved UI performance

By: johannes

johannes — Sat, 01 May 2010 11:38:18 +0000

Very nice idea! I will take a closer look at your code. At least for sliders this seems to be a very good approach.

But I think for this demo particular demo it won’t work. The change of the opacity takes too long.

By: Dan Powell

Dan Powell — Thu, 29 Apr 2010 17:43:13 +0000

This great technique should work for Swing too.

By: Jasper Potts

Jasper Potts — Wed, 28 Apr 2010 14:58:46 +0000

Another way to do it is to round the slider value to the nearest X. Where X depends on how many stops you want between min and max. Below is some example code showing how to limit a slider to 10 stops between min and max. This should be much lighter weight than using a Timer.

import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.text.Text;
import javafx.scene.text.Font;
import javafx.scene.control.Slider;

var text:Text;
var slider:Slider;

def numberOfStops = 10;
def factor = bind 1/ ((slider.max – slider.min)/numberOfStops);
var sliderValue = bind ((slider.value*factor) as Integer) / factor;

Stage {
scene: Scene {
width: 250
height: 150
content: [
text = Text {
font : Font { size : 16 }
x: 10
y: 30
content: bind "Slider value = {slider.value}\n sliderValue={sliderValue}"
}
slider = Slider {
layoutX: 20
layoutY: 80
min: 0
max: 0.4
majorTickUnit: 2
minorTickCount: 1
snapToTicks: true
}

]
}
}

By: johannes

johannes — Wed, 28 Apr 2010 08:09:06 +0000

Thanks for the hint. I just used a JNLP created by Netbeans. Obviously I should have looked at it first… Thanks.

By: John Smith

John Smith — Tue, 27 Apr 2010 20:11:53 +0000

Nice post, I noticed that the slider was really unresponsive when I first tried that demo a few times ago – I thought it was due to poor performance of the JavaFX runtime rather than inefficient application code.

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