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JavaFX background image load tracking example.
import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.geometry.Pos;
import javafx.scene.*;
import javafx.scene.control.*;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.HBox;
import javafx.scene.layout.HBoxBuilder;
import javafx.scene.layout.Priority;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.StackPaneBuilder;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
/** Demo of tracking the loading of background images in JavaFX */
public class ImageLoadTracker extends Application {
private static final String SHALLOT_IMAGE_URL = "http://upload.wikimedia.org/wikipedia/commons/8/83/JWW_TheLadyOfShallot_1888.jpg";
private static final String BROKEN_IMAGE_URL = "http://error.org/imagedoesnotexist.jpg";
private static final Image ERROR_IMAGE = new Image("http://icons.iconarchive.com/icons/visualpharm/must-have/256/Cancel-icon.png"); // linkware icon from http://www.visualpharm.com/
@Override public void start(final Stage stage) {
// a label for reporting the current image loading status.
final Label statusLabel = new Label();
// a progressbar to monitor the progress of background image loading.
final Label progressLabel = new Label("Loading progress");
final ProgressBar progressBar = new ProgressBar();
// a view to hold the loaded image.
final ImageView imageView = new ImageView();
// radio buttons to control image loading.
final RadioButton shallotImageSelection = new RadioButton("Load a nice image");
final RadioButton brokenImageSelection = new RadioButton("Load a broken image");
shallotImageSelection.setUserData(SHALLOT_IMAGE_URL);
brokenImageSelection.setUserData(BROKEN_IMAGE_URL);
// a toggle group to load images when the user toggles between the toggles.
ToggleGroup imageToggle = new ToggleGroup();
shallotImageSelection.setToggleGroup(imageToggle);
brokenImageSelection.setToggleGroup(imageToggle);
imageToggle.selectedToggleProperty().addListener(new ChangeListener<Toggle>() {
@Override public void changed(ObservableValue<? extends Toggle> observable, Toggle oldValue, Toggle newValue) {
// reset the error text.
statusLabel.setText("Loading image . . .");
statusLabel.setStyle("-fx-text-fill: silver;");
// load an image in the background.
final String newImageUrl = (String) newValue.getUserData();
final Image newImage = new Image(newImageUrl, true);
imageView.setImage(newImage);
// track the image's error property.
newImage.errorProperty().addListener(new ChangeListener<Boolean>() {
@Override public void changed(ObservableValue<? extends Boolean> observable, Boolean oldValue, Boolean imageError) {
if (imageError) {
statusLabel.setText("Oh-oh there was an error loading: " + newImageUrl);
statusLabel.setStyle("-fx-text-fill: firebrick;");
imageView.setImage(ERROR_IMAGE);
}
}
});
// track the image's loading progress.
progressBar.progressProperty().bind(newImage.progressProperty());
newImage.progressProperty().addListener(new ChangeListener<Number>() {
@Override public void changed(ObservableValue<? extends Number> observable, Number oldValue, Number progress) {
if ((Double) progress == 1.0 && ! newImage.isError()) {
statusLabel.setText("Loading complete");
statusLabel.setStyle("-fx-text-fill: forestgreen;");
}
}
});
}
});
// layout the scene.
StackPane imageLayout = StackPaneBuilder.create().children(imageView).build();
VBox layout = new VBox(10);
layout.getChildren().addAll(
shallotImageSelection,
brokenImageSelection,
statusLabel,
HBoxBuilder.create().spacing(10).alignment(Pos.CENTER).children(progressLabel, progressBar).build(),
imageLayout
);
VBox.setVgrow(imageLayout, Priority.ALWAYS);
progressBar.setMaxWidth(Double.MAX_VALUE);
HBox.setHgrow(progressBar, Priority.ALWAYS);
layout.setStyle("-fx-background-color: cornsilk; -fx-padding: 10;");
stage.setTitle("Image Loading Tracker");
stage.setScene(new Scene(layout, 1315, 1000));
stage.show();
// trigger the loading of a good image.
shallotImageSelection.fire();
}
public static void main(String[] args) { launch(); }
}
@jewelsea
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Author

jewelsea commented Apr 30, 2012

@MenaiAla
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MenaiAla commented Jan 12, 2018

@jwelsea ,this example helps me ,thank you :)

@ranjitvamadevan
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ranjitvamadevan commented Apr 7, 2021

this program is not working for me, kindly help.

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