java 如何让 JavaFX Slider 以离散的步骤移动？
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How to make JavaFX Slider to move in discrete steps?
提问by Mr Redstoner
I am making a GUIusing JavaFxand I need sliders that only allow integersto ever be selected.
我正在GUI使用JavaFx，我需要只允许integers选择的滑块。
I know I can use snapToTicks, but while pulling the "knob", it can still represent a non-integervalue. I would like to get rid of that. It messes up other components linked to it.
我知道我可以使用snapToTicks，但是在拉动 时"knob"，它仍然可以代表一个non-integer值。我想摆脱它。它弄乱了与之链接的其他组件。
Basically, I want something like Swing's JSlider, but with JavaFx. Is it possible? I have been searching but I can't find anything.
基本上，我想要类似的东西Swing's JSlider，但是JavaFx. 是否可以？我一直在寻找，但找不到任何东西。
回答by DVarga
You can simply add a listener to the valuePropertyof the Sliderand then you can either set the integer valueof the new Numbervalue:
您只需一个监听器添加到valueProperty的Slider，然后你可以设置的整数值的新的Number价值：
slider.valueProperty().addListener((obs, oldval, newVal) ->
slider.setValue(newVal.intValue()));
or alternatively you can use integer rounding using Math.round:
或者，您可以使用整数舍入使用Math.round：
slider.valueProperty().addListener((obs, oldval, newVal) ->
slider.setValue(Math.round(newVal.doubleValue())));
回答by Arthur Va?sse
In FXML:
在 FXML 中：
<Slider fx:id="availableReproSelector"
blockIncrement="1.0"
cache="true"
majorTickUnit="1.0"
max="4.0"
min="1.0"
minorTickCount="0"
showTickLabels="true"
showTickMarks="true"
snapToTicks="true"
value="1.0"
/>
Or in Java:
或者在 Java 中：
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 :
这里的关键是对齐刻度选项与刻度单位的正确组合。此设置导致以下滑块只能用于选择范围从 1 到 4 的值：
