爲了在JavaFX ImageView中轉換

Question

我已經看過How to wait for a transition to end in javafx 2.1?但它不能很好地解決我的問題。

我的ImageView對象的名單，我想通過這個列表進行迭代，並在每個表的「幻燈片」執行以下操作：

1. 淡入
2. 停留幾秒鐘
3. 淡出

，我有以下到位，但由於過渡是異步的，循環應用的同時過渡到所有的「幻燈片」代碼：

// 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; 

} 

有關如何逐一對這些List ImageView對象進行動畫處理的任何想法（無論ListView中有多少ImageView，因此我不想對其進行硬編碼）。謝謝。

Answer 1

所以，obivous修復程序，這將是使用您的SequentialTransitions播放這些轉換周圍SequentialTransition，以及順序，而不是所有的一次：

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，你應該使用PauseTransition代替一個從1.0到1.0插值的FadeTransition。

這方面的一個完整的示例應用程序看起來是這樣的：

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(); 
    } 
}