corejava第10版

corejava第10版/v2ch11/imageTransfer/ImageTransferFrame.java

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+package imageTransfer;
+
+import java.awt.*;
+import java.awt.datatransfer.*;
+import java.awt.image.*;
+import java.io.*;
+
+import javax.swing.*;
+
+/**
+ * This frame has an image label and buttons for copying and pasting an image.
+ */
+class ImageTransferFrame extends JFrame
+{
+   private JLabel label;
+   private Image image;
+   private static final int IMAGE_WIDTH = 300;
+   private static final int IMAGE_HEIGHT = 300;
+
+   public ImageTransferFrame()
+   {
+      label = new JLabel();
+      image = new BufferedImage(IMAGE_WIDTH, IMAGE_HEIGHT, BufferedImage.TYPE_INT_ARGB);
+      Graphics g = image.getGraphics();
+      g.setColor(Color.WHITE);
+      g.fillRect(0, 0, IMAGE_WIDTH, IMAGE_HEIGHT);
+      g.setColor(Color.RED);
+      g.fillOval(IMAGE_WIDTH / 4, IMAGE_WIDTH / 4, IMAGE_WIDTH / 2, IMAGE_HEIGHT / 2);
+
+      label.setIcon(new ImageIcon(image));
+      add(new JScrollPane(label), BorderLayout.CENTER);
+      JPanel panel = new JPanel();
+
+      JButton copyButton = new JButton("Copy");
+      panel.add(copyButton);
+      copyButton.addActionListener(event -> copy());
+
+      JButton pasteButton = new JButton("Paste");
+      panel.add(pasteButton);
+      pasteButton.addActionListener(event -> paste());
+
+      add(panel, BorderLayout.SOUTH);
+      pack();
+   }
+
+   /**
+    * Copies the current image to the system clipboard.
+    */
+   private void copy()
+   {
+      Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
+      ImageTransferable selection = new ImageTransferable(image);
+      clipboard.setContents(selection, null);
+   }
+
+   /**
+    * Pastes the image from the system clipboard into the image label.
+    */
+   private void paste()
+   {
+      Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
+      DataFlavor flavor = DataFlavor.imageFlavor;
+      if (clipboard.isDataFlavorAvailable(flavor))
+      {
+         try
+         {
+            image = (Image) clipboard.getData(flavor);
+            label.setIcon(new ImageIcon(image));
+         }
+         catch (UnsupportedFlavorException | IOException ex)
+         {
+            JOptionPane.showMessageDialog(this, ex);
+         }
+      }
+   }
+}