JGraphXで画像をドロップするサンプル

JGraphXFileDropExample.java

package neoki.slm;
import com.mxgraph.model.mxCell;
import com.mxgraph.model.mxGeometry;
import com.mxgraph.swing.mxGraphComponent;

import com.mxgraph.view.mxGraph;

import javax.swing.*;
import java.awt.*;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.dnd.*;
import java.io.File;
import java.util.List;
import java.util.stream.Stream;

public class JGraphXFileDropExample {

    public static void main(String[] args) {

        JFrame frame = new JFrame("JGraphX Example");
        frame.setLayout(new BorderLayout());

        mxGraph graph = new mxGraph();
        graph.getModel().beginUpdate();
        mxCell vertex1 = (mxCell) graph.insertVertex(graph.getDefaultParent(), null, "Hello", 20, 20, 80, 30);
        mxGraphComponent graphComponent = new mxGraphComponent(graph);
        graph.getModel().endUpdate();

        frame.add(graphComponent, BorderLayout.CENTER);

        var oldDropTarget = graphComponent.getDropTarget();

        graphComponent.setDropTarget(new DropTarget(graphComponent, DnDConstants.ACTION_COPY, new DropTargetAdapter() {

            @Override
            public void dragEnter(DropTargetDragEvent dtde) {
                if (!dtde.getTransferable().isDataFlavorSupported(DataFlavor.javaFileListFlavor)) {
                    oldDropTarget.dragEnter(dtde);
                }
            }

            @Override
            public void drop(DropTargetDropEvent dtde) {
                try {
                    Transferable tr = dtde.getTransferable();

                    if (tr.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) {
                        dtde.acceptDrop(DnDConstants.ACTION_COPY_OR_MOVE);
                        List<File> fileList = (List<File>) tr.getTransferData(DataFlavor.javaFileListFlavor);
                        for (File file : fileList) {
                            String filePath = file.getAbsolutePath();
                            if (Stream.of(".jpg", ".jpeg", ".png", ".gif").anyMatch(p -> filePath.toLowerCase().endsWith(p))) {
                                ImageIcon imageIcon = new ImageIcon(filePath);
                                mxGeometry geometry = new mxGeometry(
                                        dtde.getLocation().x - imageIcon.getIconWidth() / 2,
                                        dtde.getLocation().y - imageIcon.getIconHeight() / 2,
                                        imageIcon.getIconWidth(), imageIcon.getIconHeight());
                                String fileURL = file.toURI().toURL().toString();
                                mxCell cell = new mxCell(imageIcon.getImage(), geometry, "shape=image;image=" + fileURL);
                                cell.setVertex(true);
                                cell.setValue("");
                                cell.setConnectable(true);

                                graph.getModel().beginUpdate();
                                try {
                                    graph.addCell(cell, graph.getDefaultParent());
                                } finally {
                                    graph.getModel().endUpdate();
                                }
                            }
                        }
                        dtde.dropComplete(true);
                    } else {
                        if (oldDropTarget != null) {
                            oldDropTarget.drop(dtde);
                        }
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }));

        frame.setSize(800, 600);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
}

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>naoki</groupId>
    <artifactId>SmallLanguageModel</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencies>
        <dependency>
            <groupId>com.github.vlsi.mxgraph</groupId>
            <artifactId>jgraphx</artifactId>
            <version>4.2.2</version>
        </dependency>
    </dependencies>
    <properties>
        <maven.compiler.source>20</maven.compiler.source>
        <maven.compiler.target>20</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

</project>