Friday, January 18, 2013

bind widthProperty and heightProperty of Image

The former article described how to "Get width and height of a Image" by calling getWidth() and getHeight() methods. Alternative, we can bind the textProperty of label with widthProperty and heightProperty of Image. Please notice that image cannot be null in this case, otherwise java.lang.NullPointerException will be thrown.

bind widthProperty and heightProperty of Image
bind widthProperty and heightProperty of Image

package javafxpixel;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.application.Application;
import javafx.embed.swing.SwingFXUtils;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.VBox;
import javafx.stage.FileChooser;
import javafx.stage.Stage;
import javax.imageio.ImageIO;

/**
 *
 * @web http://java-buddy.blogspot.com/
 */
public class JavaFXPixel extends Application {
    
    Label label;
    ImageView myImageView;
    
    @Override
    public void start(Stage primaryStage) {
        Button btnLoad = new Button("Load");
        btnLoad.setOnAction(btnLoadEventListener);
         
        label = new Label();
        myImageView = new ImageView();
 
        VBox rootBox = new VBox();
        rootBox.getChildren().addAll(btnLoad, label, myImageView);
         
        Scene scene = new Scene(rootBox, 300, 300);
         
        primaryStage.setTitle("java-buddy.blogspot.com");
        primaryStage.setScene(scene);
        primaryStage.show();

    }

    public static void main(String[] args) {
        launch(args);
    }
    
    EventHandler<ActionEvent> btnLoadEventListener
    = new EventHandler<ActionEvent>(){
 
        @Override
        public void handle(ActionEvent t) {
            FileChooser fileChooser = new FileChooser();
             
            //Set extension filter
            FileChooser.ExtensionFilter extFilterJPG = new FileChooser.ExtensionFilter("JPG files (*.jpg)", "*.JPG");
            FileChooser.ExtensionFilter extFilterPNG = new FileChooser.ExtensionFilter("PNG files (*.png)", "*.PNG");
            fileChooser.getExtensionFilters().addAll(extFilterJPG, extFilterPNG);
              
            //Show open file dialog
            File file = fileChooser.showOpenDialog(null);

            BufferedImage bufferedImage;
            try {
                bufferedImage = ImageIO.read(file);
                Image image = SwingFXUtils.toFXImage(bufferedImage, null);

                myImageView.setImage(image);                
                label.textProperty().bind(
                        image.widthProperty().asString()
                        .concat(" : ")
                        .concat(image.heightProperty().asString()));

            } catch (IOException ex) {
                Logger.getLogger(JavaFXPixel.class.getName()).log(Level.SEVERE, null, ex);
            }

        }
    };
}


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