Question

我遇到了一个问题，我无法找到解决方法。我有一个HtmlEditor事件，它检测按键何时被按下，但是我需要创建一个监听器来检查HtmlEditor文本是否被更改，我想出了这个：

htmlEditor.setOnKeyPressed((keyEvent) ->{
                            if(keyEvent.getCode().isDigitKey() || keyEvent.getCode().isLetterKey() ||
                            keyEvent.getCode().isModifierKey() || keyEvent.getCode().isWhitespaceKey() ||
                            keyEvent.isShiftDown()){
                                handleWhoTypes(null);     
                            }  
                        });

                        PauseTransition timer = new PauseTransition(Duration.seconds(5));
                        htmlEditor.textProperty().addListener((obs, oldText, newText) ->
                            timer.playFromStart());
                        timer.setOnFinished(e -> handleIsPaused(null));
        }

但这不起作用，因为htmlEditor没有textProperty（），我想不出另一个解决方案。提前谢谢。

Answer 1

看起来你必须轮询编辑的文字：

Runnable textMonitor = new Runnable() {
    private String previousText;

    @Override
    public void run() {
        String newText = htmlEditor.getHtmlText();
        boolean changed = !newText.equals(previousText);

        previousText = newText;

        if (changed) {
            timer.playFromStart();
        }
    }
};

BooleanBinding windowShowing = Bindings.selectBoolean(
    htmlEditor.sceneProperty(), "window", "showing");
windowShowing.addListener(
    new ChangeListener<Boolean>() {
        private ScheduledExecutorService executor;

        @Override
        public void changed(ObservableValue<? extends Boolean> o,
                            Boolean old,
                            Boolean showing) {
            if (showing) {
                executor = Executors.newSingleThreadScheduledExecutor();
                executor.scheduleWithFixedDelay(
                    () -> Platform.runLater(textMonitor),
                    1, 1, TimeUnit.SECONDS);
            } else {
                executor.shutdown();
            }
        }
    });

JavaFX HTMLEditor文本在5秒内更改

1 个答案: