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MainPanel.java
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MainPanel.java
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// -*- mode:java; encoding:utf-8 -*-
// vim:set fileencoding=utf-8:
// @homepage@
package example;
import java.awt.*;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.dnd.DnDConstants;
import java.awt.dnd.DropTarget;
import java.awt.dnd.DropTargetAdapter;
import java.awt.dnd.DropTargetDragEvent;
import java.awt.dnd.DropTargetDropEvent;
import java.awt.font.FontRenderContext;
import java.awt.font.TextLayout;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;
import java.awt.geom.RoundRectangle2D;
import java.io.File;
import java.io.IOException;
import java.util.List;
import javax.swing.*;
public final class MainPanel extends JPanel {
private MainPanel() {
super();
JLabel l = new JLabel(new DragHereIcon());
l.setText("<html>Drag <b>Files</b> Here");
l.setVerticalTextPosition(SwingConstants.BOTTOM);
l.setHorizontalTextPosition(SwingConstants.CENTER);
l.setForeground(Color.GRAY);
l.setFont(new Font(Font.SERIF, Font.PLAIN, 24));
l.setDropTarget(new DropTarget(l, DnDConstants.ACTION_COPY, new FileDropListener(), true));
// Test: l.setTransferHandler(new FileTransferHandler());
add(l);
setPreferredSize(new Dimension(320, 240));
}
public static void main(String[] args) {
EventQueue.invokeLater(MainPanel::createAndShowGui);
}
private static void createAndShowGui() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (UnsupportedLookAndFeelException ignored) {
Toolkit.getDefaultToolkit().beep();
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException ex) {
ex.printStackTrace();
return;
}
JFrame frame = new JFrame("@title@");
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.getContentPane().add(new MainPanel());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
class DragHereIcon implements Icon {
private static final int ICON_WIDTH = 100;
private static final int ICON_HEIGHT = 100;
private static final float BORDER_SIZE = 8f;
private static final float SLIT_WIDTH = 8f;
private static final int ARC_SIZE = 16;
private static final int SLIT_NUM = 3;
private static final Shape BORDER = new RoundRectangle2D.Double(
BORDER_SIZE, BORDER_SIZE,
ICON_WIDTH - 2 * BORDER_SIZE - 1, ICON_HEIGHT - 2 * BORDER_SIZE - 1,
ARC_SIZE, ARC_SIZE);
private static final Font FONT = new Font(Font.MONOSPACED, Font.BOLD, ICON_WIDTH);
// FontRenderContext FRC = new FontRenderContext(null, true, true);
// U+21E9: DOWNWARDS WHITE ARROW
// Shape ARROW = new TextLayout("\u21E9", FONT, FRC).getOutline(null);
// U+2B07: DOWNWARDS BLACK ARROW
// private static final Shape ARROW = new TextLayout("\u2B07", font, frc).getOutline(null);
private static final Color LINE_COLOR = Color.GRAY;
@Override public void paintIcon(Component c, Graphics g, int x, int y) {
Graphics2D g2 = (Graphics2D) g.create();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.translate(x, y);
g2.setStroke(new BasicStroke(BORDER_SIZE));
g2.setPaint(LINE_COLOR);
g2.draw(BORDER);
g2.setStroke(new BasicStroke(SLIT_WIDTH));
g2.setPaint(UIManager.getColor("Panel.background"));
int n = SLIT_NUM + 1;
int v = ICON_WIDTH / n;
int m = n * v;
for (int i = 1; i < n; i++) {
int a = i * v;
g2.drawLine(a, 0, a, m);
g2.drawLine(0, a, m, a);
}
// g2.drawLine(1 * v, 0 * v, 1 * v, 4 * v);
// g2.drawLine(2 * v, 0 * v, 2 * v, 4 * v);
// g2.drawLine(3 * v, 0 * v, 3 * v, 4 * v);
// g2.drawLine(0 * v, 1 * v, 4 * v, 1 * v);
// g2.drawLine(0 * v, 2 * v, 4 * v, 2 * v);
// g2.drawLine(0 * v, 3 * v, 4 * v, 3 * v);
FontRenderContext frc = g2.getFontRenderContext();
Shape arrow = new TextLayout("⇩", FONT, frc).getOutline(null);
g2.setPaint(LINE_COLOR);
Rectangle2D b = arrow.getBounds2D();
double cx = ICON_WIDTH / 2d - b.getCenterX();
double cy = ICON_HEIGHT / 2d - b.getCenterY();
AffineTransform toCenterAt = AffineTransform.getTranslateInstance(cx, cy);
g2.fill(toCenterAt.createTransformedShape(arrow));
g2.dispose();
}
@Override public int getIconWidth() {
return ICON_WIDTH;
}
@Override public int getIconHeight() {
return ICON_HEIGHT;
}
}
class FileDropListener extends DropTargetAdapter {
@Override public void dragOver(DropTargetDragEvent e) {
if (e.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) {
e.acceptDrag(DnDConstants.ACTION_COPY);
return;
}
e.rejectDrag();
}
@Override public void drop(DropTargetDropEvent e) {
try {
if (e.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) {
e.acceptDrop(DnDConstants.ACTION_COPY);
Transferable t = e.getTransferable();
List<?> list = (List<?>) t.getTransferData(DataFlavor.javaFileListFlavor);
String str = list.stream()
.filter(File.class::isInstance)
.map(o -> ((File) o).getAbsolutePath() + "<br>")
.reduce("<html>", String::concat);
JOptionPane.showMessageDialog(null, str);
e.dropComplete(true);
} else {
e.rejectDrop();
}
} catch (UnsupportedFlavorException | IOException ex) {
e.rejectDrop();
}
}
}
// class FileTransferHandler extends TransferHandler {
// @Override public boolean importData(TransferHandler.TransferSupport support) {
// Transferable transferable = support.getTransferable();
// try {
// for (Object o : (List<?>) transferable.getTransferData(DataFlavor.javaFileListFlavor)) {
// if (o instanceof File) {
// File file = (File) o;
// System.out.println(file.getAbsolutePath());
// }
// }
// return true;
// } catch (Exception ex) {
// ex.printStackTrace();
// }
// return false;
// }
//
// @Override public boolean canImport(TransferHandler.TransferSupport support) {
// return support.isDataFlavorSupported(DataFlavor.javaFileListFlavor);
// }
// }