java 在 ProgressBar 上绘制一个字符串，比如 JProgressBar？
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Draw a String onto a ProgressBar, like JProgressBar?
提问by mattbdean
I recently started working with JavaFX, and started making FX versions of my custom Swing components. One of them was a count down timer, in which a JProgressBarwas involved. I would draw the current time onto the bar using it's setString(String)method. Unfortunately, there does not seem to be such a method with JavaFX's ProgressBar. The closest thing I saw to what I was looking for was this:
我最近开始使用 JavaFX，并开始制作自定义 Swing 组件的 FX 版本。其中之一是倒数计时器，其中JProgressBar涉及 a。我会使用它的setString(String)方法将当前时间绘制到栏上。不幸的是，JavaFX 的ProgressBar. 我看到的最接近我正在寻找的东西是这样的：
(source)
（来源）
I don't know if this would require a whole new custom component, or just a class like java.awt.Graphics.
我不知道这是否需要一个全新的自定义组件，或者只是一个像java.awt.Graphics.
Any help would be much appreciated. Thanks :)
任何帮助将非常感激。谢谢 ：）
回答by jewelsea
Here is a sample which (I think) does what your question is asking.
这是一个示例（我认为）可以满足您的问题。
class ProgressIndicatorBar extends StackPane {
final private ReadOnlyDoubleProperty workDone;
final private double totalWork;
final private ProgressBar bar = new ProgressBar();
final private Text text = new Text();
final private String labelFormatSpecifier;
final private static int DEFAULT_LABEL_PADDING = 5;
ProgressIndicatorBar(final ReadOnlyDoubleProperty workDone, final double totalWork, final String labelFormatSpecifier) {
this.workDone = workDone;
this.totalWork = totalWork;
this.labelFormatSpecifier = labelFormatSpecifier;
syncProgress();
workDone.addListener(new ChangeListener<Number>() {
@Override public void changed(ObservableValue<? extends Number> observableValue, Number number, Number number2) {
syncProgress();
}
});
bar.setMaxWidth(Double.MAX_VALUE); // allows the progress bar to expand to fill available horizontal space.
getChildren().setAll(bar, text);
}
// synchronizes the progress indicated with the work done.
private void syncProgress() {
if (workDone == null || totalWork == 0) {
text.setText("");
bar.setProgress(ProgressBar.INDETERMINATE_PROGRESS);
} else {
text.setText(String.format(labelFormatSpecifier, Math.ceil(workDone.get())));
bar.setProgress(workDone.get() / totalWork);
}
bar.setMinHeight(text.getBoundsInLocal().getHeight() + DEFAULT_LABEL_PADDING * 2);
bar.setMinWidth (text.getBoundsInLocal().getWidth() + DEFAULT_LABEL_PADDING * 2);
}
}
A complete executable test harnessis also available.
一个完整的可执行测试工具也可以。
Sample program output:
示例程序输出：
