java - 如何从按钮操作中刷新 JavaFX 场景？

Question

我正在制作一个排序算法可视化工具，我希望 UI 能够实时更新以逐步展示它的工作原理。

但是 UI 仅在 sort() 方法完成时更新，我希望它在 updateHeight() 完成时更新

sort() 方法由 onAction 启动

   @FXML
public void sort() throws InterruptedException {
    minHeight = RectHeight[0];
    counter = 0;
    minIndex = 0;
    temp = 0;

    for(int i=1;i<RectList.size();i++){
        System.out.println(RectList.size());
        System.out.println(counter);
        sort2();
    }


}
public void sort2() throws InterruptedException {
    System.out.println("start sort");

    System.out.println(minHeight);



    System.out.println("find min");
    for (int i = counter; i < (RectList.size()); i++) {
        System.out.println("i= " + i);
        if (RectHeight[i] < minHeight) {
            minHeight = RectHeight[i];
            System.out.println("minHeight= " + minHeight);
            System.out.println("minIndex= " + i);
            minIndex = i;
        }
    }

    updateHeight();
    Thread.sleep(500);

}

public void updateHeight() {
    temp = RectHeight[counter];
    RectHeight[counter] = RectHeight[minIndex];
    RectList.get(counter).setHeight(RectHeight[counter]);

    RectHeight[minIndex] = temp;
    RectList.get(minIndex).setHeight(temp);


    counter++;
    minHeight = RectHeight[counter];
    minIndex = counter;

}

标签： javajavafx

Answer 1

永远不要在 FX 应用程序线程上睡觉。该线程负责渲染 UI，因此Thread.sleep()正如您所观察到的，通过阻止它来阻止 UI 被渲染。

相反，请使用动画 API。一个简单的Timeline应该在这里工作：

@FXML
public void sort() {

    Timeline timeline = new Timeline();
    timeline.getKeyFrames().add(new KeyFrame(Duration.millis(500), e -> sort2()));
    timeline.setCycleCount(rectList.size());
    minHeight = rectHeight[0];
    counter = 0;
    minIndex = 0;
    temp = 0;

    timeline.play();


}

public void sort2() {
    System.out.println("start sort");

    System.out.println(minHeight);



    System.out.println("find min");
    for (int i = counter; i < (rectList.size()); i++) {
        System.out.println("i= " + i);
        if (rectHeight[i] < minHeight) {
            minHeight = rectHeight[i];
            System.out.println("minHeight= " + minHeight);
            System.out.println("minIndex= " + i);
            minIndex = i;
        }
    }

    updateHeight();

}

public void updateHeight() {
    temp = rectHeight[counter];
    rectHeight[counter] = rectHeight[minIndex];
    rectList.get(counter).setHeight(rectHeight[counter]);

    rectHeight[minIndex] = temp;
    rectList.get(minIndex).setHeight(temp);


    counter++;
    minHeight = rectHeight[counter];
    minIndex = counter;

}