在JavaFX中实现ImageView的过渡效果

Question

在JavaFX中实现ImageView的过渡效果

javadesign-patternsjavafx-2javafx

5

我已经查看了如何在javafx 2.1中等待过渡结束？，但它并没有完全解决我的问题。

我有一个ImageView对象的列表，并且我想迭代这个列表并对每个“幻灯片”执行以下操作：

淡入
停留几秒钟
淡出

我已经编写了下面的代码，但由于过渡是异步的，循环会同时将过渡应用于所有“幻灯片”：

// The method I am running in my class

public void start() {

    for (ImageView slide : slides) {

        SequentialTransition sequentialTransition = new SequentialTransition();

        FadeTransition fadeIn = Transition.getFadeTransition(slide, 0.0, 1.0, 2000);
        FadeTransition stayOn = Transition.getFadeTransition(slide, 1.0, 1.0, 2000);
        FadeTransition fadeOut = Transition.getFadeTransition(slide, 1.0, 0.0, 2000);

        sequentialTransition.getChildren().addAll(fadeIn, stayOn, fadeOut);               
        this.root.getChildren().add(slide);            
        sequentialTransition.play();

    }
}

// the method in the Transition helper class:

public static FadeTransition getFadeTransition(ImageView imageView, double fromValue, double toValue, int durationInMilliseconds) {

    FadeTransition ft = new FadeTransition(Duration.millis(durationInMilliseconds), imageView);
    ft.setFromValue(fromValue);
    ft.setToValue(toValue);

    return ft;

}

有什么想法可以让这些 ImageView 对象一个接一个地动起来（无论列表中有多少个 ImageView，我都不想硬编码）。谢谢。

- Software Guy

1个回答

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- zhujik · Accepted Answer

因此，显而易见的解决方法是使用一个包围顺序转换的顺序转换，按顺序播放这些转换，而不是一次性全部播放：

public void start() {

    SequentialTransition slideshow = new SequentialTransition();

    for (ImageView slide : slides) {

        SequentialTransition sequentialTransition = new SequentialTransition();

        FadeTransition fadeIn = Transition.getFadeTransition(slide, 0.0, 1.0, 2000);
        FadeTransition stayOn = Transition.getFadeTransition(slide, 1.0, 1.0, 2000);
        FadeTransition fadeOut = Transition.getFadeTransition(slide, 1.0, 0.0, 2000);

        sequentialTransition.getChildren().addAll(fadeIn, stayOn, fadeOut);               
        this.root.getChildren().add(slide);            
        slideshow.getChildren().add(sequentialTransition);

    }
    slideshow.play();
}

其次，你应该使用PauseTransition而不是从1.0插值到1.0的FadeTransition。

一个完整的示例应用程序可能看起来像这样:

package slideshow;

import javafx.animation.FadeTransition;
import javafx.animation.PauseTransition;
import javafx.animation.SequentialTransition;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
import javafx.util.Duration;

public class SimpleSlideShowTest extends Application{

  class SimpleSlideShow {

    StackPane root = new StackPane();
    ImageView[] slides;

    public SimpleSlideShow() {
      this.slides = new ImageView[4];
      Image image1 = new Image(SlideShowTest.class.getResource("pic1").toExternalForm());
      Image image2 = new Image(SlideShowTest.class.getResource("pic2").toExternalForm());
      Image image3 = new Image(SlideShowTest.class.getResource("pic3").toExternalForm());
      Image image4 = new Image(SlideShowTest.class.getResource("pic4").toExternalForm());
      slides[0] = new ImageView(image1);
      slides[1] = new ImageView(image2);
      slides[2] = new ImageView(image3);
      slides[3] = new ImageView(image4);

    }

    public StackPane getRoot() {
      return root;
    }

    // The method I am running in my class

    public void start() {

      SequentialTransition slideshow = new SequentialTransition();

      for (ImageView slide : slides) {

        SequentialTransition sequentialTransition = new SequentialTransition();

        FadeTransition fadeIn = getFadeTransition(slide, 0.0, 1.0, 2000);
        PauseTransition stayOn = new PauseTransition(Duration.millis(2000));
        FadeTransition fadeOut = getFadeTransition(slide, 1.0, 0.0, 2000);

        sequentialTransition.getChildren().addAll(fadeIn, stayOn, fadeOut);
        slide.setOpacity(0);
        this.root.getChildren().add(slide);
        slideshow.getChildren().add(sequentialTransition);

      }
      slideshow.play();
    }

// the method in the Transition helper class:

    public FadeTransition getFadeTransition(ImageView imageView, double fromValue, double toValue, int durationInMilliseconds) {

      FadeTransition ft = new FadeTransition(Duration.millis(durationInMilliseconds), imageView);
      ft.setFromValue(fromValue);
      ft.setToValue(toValue);

      return ft;

    }
  }

  public static void main(String[] args) {
    launch(args);
  }

  @Override
  public void start(Stage primaryStage) throws Exception {
    SimpleSlideShow simpleSlideShow = new SimpleSlideShow();
    Scene scene = new Scene(simpleSlideShow.getRoot());
    primaryStage.setScene(scene);
    primaryStage.show();
    simpleSlideShow.start();
  }
}