Image Gallery

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.nio.file.Files;
import java.util.LinkedList;
import java.util.List;
import javafx.application.Application;
import javafx.beans.property.BooleanProperty;
import javafx.beans.property.SimpleBooleanProperty;
import javafx.event.ActionEvent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.ScrollPane;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.input.DragEvent;
import javafx.scene.input.Dragboard;
import javafx.scene.input.TransferMode;
import javafx.scene.layout.TilePane;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

/**
 *
 * @author toffe boy Aamir
 */
public class DragAndDropImages extends Application {

    ImageView[] imageView;
    List<Image> AllImages = new LinkedList();
    Button clearBtn = new Button("Clear");
    Scene scene;
    TilePane imgBox;
    Label msgLbl = new Label(
            "Drag and drop images below.");

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

    @Override
    public void start(Stage window) {

        VBox root = BuildUI();
        scene = new Scene(root, 500, 500);
        scene.setOnDragDropped(this::dragDropped);
        scene.setOnDragOver(this::dragOver);

        window.setScene(scene);
        root.setStyle("-fx-padding: 10;"
                + "-fx-border-style: solid inside;"
                + "-fx-border-width: 2;"
                + "-fx-border-insets: 5;"
                + "-fx-border-radius: 5;"
                + "-fx-border-color: blue;");
        window.setTitle("Drag-and-Drop");
        window.show();
    }

    private VBox BuildUI() {
        imgBox = new TilePane();
        imgBox.setHgap(5.0);
        imgBox.setVgap(2.0);
        ScrollPane root = new ScrollPane(imgBox);
        root.setHbarPolicy(ScrollPane.ScrollBarPolicy.NEVER);
        root.setVbarPolicy(ScrollPane.ScrollBarPolicy.AS_NEEDED);
        root.setFitToWidth(true);

        clearBtn.setOnAction((ActionEvent e) -> {
            AllImages.clear();
            imgBox.getChildren().clear();
        });
        //Set the Size for the Images View

        VBox box = new VBox(10, msgLbl, root, clearBtn);
        return box;
    }

    private void dragOver(DragEvent de) {
        Dragboard db = de.getDragboard();
        if (db.hasFiles() || db.hasImage()) {
            de.acceptTransferModes(TransferMode.ANY);
        }
        de.consume();

    }

    private void dragDropped(DragEvent de) {

        boolean isDone = false;
        //transfer the Data
        Dragboard db = de.getDragboard();
        if (db.hasImage()) {
            addImg(db.getImage());
            updateView();
            isDone = true;
        } else if (db.hasFiles()) {
            isDone = transferimgFromFile(db.getFiles());
            updateView();

        }

        //if data Transfer not Done
        de.setDropCompleted(isDone);
        de.consume();

    }

    private void addImg(Image image) {
            AllImages.add(image);
            System.out.println("image added");
        }

        private boolean transferimgFromFile(List<File> files) {

            BooleanProperty isImage = new SimpleBooleanProperty();
            isImage.set(false);

            //Look for the First File MIME
            files.iterator().forEachRemaining(x -> {
                String mime;
                try {
                    mime = Files.probeContentType(x.toPath());
                    if (mime != null && mime.startsWith("image/")) {
                        this.addImg(new Image(new FileInputStream(x.getAbsoluteFile()), 50, 50, true, true));
                        isImage.set(true);
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            });

            return isImage.get();
        }

        private void updateView() {
            System.out.println("updated");
            imageView = new ImageView[AllImages.size()];
            for (int j = 0; j < imageView.length; j++) {
                imageView[j] = new ImageView(AllImages.get(j));
                imageView[j].setFitHeight(50);
                imageView[j].setFitWidth(50);
                imageView[j].setSmooth(true);
                imageView[j].setPreserveRatio(true);
            }
            imgBox.getChildren().addAll(imageView);
            AllImages.clear();
        }


}