Experiment with different clipboard retrieval methods
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package me.goudham;
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import java.awt.BorderLayout;
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import java.awt.Dimension;
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import java.awt.GridLayout;
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import java.awt.Toolkit;
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import java.awt.datatransfer.Clipboard;
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import java.awt.datatransfer.StringSelection;
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import java.awt.event.ActionEvent;
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import java.awt.event.ActionListener;
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import javax.swing.BorderFactory;
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import javax.swing.BoxLayout;
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import javax.swing.DefaultListModel;
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import javax.swing.JButton;
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import javax.swing.JFrame;
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import javax.swing.JList;
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import javax.swing.JPanel;
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import javax.swing.JScrollPane;
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import javax.swing.JSplitPane;
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import javax.swing.ListSelectionModel;
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import javax.swing.SwingUtilities;
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// We are going to build the UI of our Clipboard History software
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// We will use Swing API
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public class ClipboardHistory extends JPanel implements ClipboardListener.EntryListener {
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// for the list of entries copied in clipboard
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private final JList<String> list;
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private final DefaultListModel<String> listModel;
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private ListSelectionModel listSelectionModel;
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public ClipboardHistory() {
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super(new BorderLayout());
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listModel = new DefaultListModel<>();
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list = new JList<>(listModel);
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listSelectionModel = list.getSelectionModel();
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listSelectionModel.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
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// we create a JScrollPane to embed our control pane
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JScrollPane listPane = new JScrollPane(list);
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JPanel controlPane = new JPanel();
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// we add a button to let users copy old entries to the clipboard
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final JButton button = new JButton("Copy");
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button.addActionListener(e -> {
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String value = list.getSelectedValue();
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int index = list.getSelectedIndex();
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// remove selected index to avoid duplicate in our list ...
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listModel.remove(index);
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// copy to clipboard
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copyToClipboard(value);
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});
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// we add the button
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controlPane.add(button);
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JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT);
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add(splitPane, BorderLayout.CENTER);
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JPanel topHalf = new JPanel();
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topHalf.setLayout(new BoxLayout(topHalf, BoxLayout.LINE_AXIS));
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JPanel listContainer = new JPanel(new GridLayout(1, 1));
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listContainer.setBorder(BorderFactory.createTitledBorder("Entries"));
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listContainer.add(listPane);
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topHalf.setBorder(BorderFactory.createEmptyBorder(5, 5, 0, 5));
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topHalf.add(listContainer);
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topHalf.setMinimumSize(new Dimension(100, 50));
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topHalf.setPreferredSize(new Dimension(100, 250));
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splitPane.add(topHalf);
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JPanel bottomHalf = new JPanel(new BorderLayout());
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bottomHalf.add(controlPane, BorderLayout.CENTER);
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bottomHalf.setPreferredSize(new Dimension(450, 30));
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splitPane.add(bottomHalf);
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}
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public void copyToClipboard(String value) {
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Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
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StringSelection data = new StringSelection(value);
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clipboard.setContents(data, data);
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}
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public void createAndShowGUI() {
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// We create a top JFrame
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JFrame frame = new JFrame("Clipboard History");
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frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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setOpaque(true);
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frame.setContentPane(this);
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frame.pack();
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frame.setVisible(true); // we display on the screen
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// we connect the Clipboard Listener to our UI
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ClipboardListener listener = new ClipboardListener();
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listener.setEntryListener(this);
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listener.start();
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}
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@Override
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public void onCopy(String data) {
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// we add new entry on the top of our list
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listModel.add(0, data);
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}
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public static void main(String[] args) {
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SwingUtilities.invokeLater(() -> new ClipboardHistory().createAndShowGUI());
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}
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}
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@ -0,0 +1,52 @@
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package me.goudham;
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import java.awt.Toolkit;
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import java.awt.datatransfer.Clipboard;
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import java.awt.datatransfer.ClipboardOwner;
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import java.awt.datatransfer.DataFlavor;
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import java.awt.datatransfer.Transferable;
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public class ClipboardListener extends Thread implements ClipboardOwner {
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public interface EntryListener {
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void onCopy(String data);
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}
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private final Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
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private EntryListener entryListener;
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@Override
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public void lostOwnership(Clipboard c, Transferable t) {
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try {
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System.out.println("Sleeping for 200 milliseconds");
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sleep(200);
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} catch (Exception ignored) { }
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Transferable contents = c.getContents(currentThread());
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processContents(contents);
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regainOwnership(c, contents);
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}
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public void processContents(Transferable t) {
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try {
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String what = (String) (t.getTransferData(DataFlavor.stringFlavor));
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if (entryListener != null) {
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entryListener.onCopy(what);
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}
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} catch (Exception ignored) { }
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}
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public void regainOwnership(Clipboard c, Transferable t) {
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c.setContents(t, this);
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}
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public void run() {
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Transferable transferable = clipboard.getContents(this);
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regainOwnership(clipboard, transferable);
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}
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public void setEntryListener(EntryListener entryListener) {
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this.entryListener = entryListener;
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}
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}
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@ -1,69 +1,100 @@
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package me.goudham.view;
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package me.goudham.view;
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import me.goudham.ClipboardListener;
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import me.goudham.controller.MyClipboardContent;
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import me.goudham.controller.MyClipboardContent;
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import me.goudham.model.TransferableImage;
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import me.goudham.model.TransferableImage;
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import javax.swing.*;
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import javax.swing.*;
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import java.awt.Color;
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import java.awt.Dimension;
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import java.awt.Image;
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import java.awt.Image;
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import java.awt.Toolkit;
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import java.awt.Toolkit;
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import java.awt.datatransfer.*;
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import java.awt.datatransfer.*;
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import java.io.IOException;
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import java.io.IOException;
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public class ClipboardView {
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public class ClipboardView implements ClipboardListener.EntryListener {
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private JPanel Clipboard;
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private JPanel Clipboard;
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private JButton copyButton;
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private JButton copyButton;
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private JList<String> clipboardContentList;
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private JList<String> clipboardContentList;
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private JLabel title;
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private final DefaultListModel<String> listModel;
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private JScrollPane scrollPane;
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private JLabel title;
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private JScrollPane scrollPane;
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public ClipboardView() {
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public ClipboardView() {
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scrollPane.setBorder(BorderFactory.createEmptyBorder());
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scrollPane.setBorder(BorderFactory.createEmptyBorder());
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listModel = new DefaultListModel<>();
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clipboardContentList.setModel(listModel);
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final java.awt.datatransfer.Clipboard systemClipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
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// final java.awt.datatransfer.Clipboard systemClipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
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final MyClipboardContent<?> previousContent = new MyClipboardContent<>("");
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// final MyClipboardContent<?> previousContent = new MyClipboardContent<>("");
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final int[] count = { 0 };
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// final int[] count = {0};
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//
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// systemClipboard.addFlavorListener(e -> {
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// MyClipboardContent<?> clipboardContent = null;
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// try {
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// if (systemClipboard.isDataFlavorAvailable(DataFlavor.stringFlavor)) {
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// String stringContent = (String) systemClipboard.getData(DataFlavor.stringFlavor);
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// clipboardContent = new MyClipboardContent<>(stringContent);
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// } else if (systemClipboard.isDataFlavorAvailable(DataFlavor.imageFlavor)) {
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// Image imageContent = (Image) systemClipboard.getData(DataFlavor.imageFlavor);
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// clipboardContent = new MyClipboardContent<>(imageContent);
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// }
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// } catch (UnsupportedFlavorException | IOException unsupportedFlavorException) {
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// unsupportedFlavorException.printStackTrace();
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// }
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//
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// if (previousContent.getContent().equals(clipboardContent.getContent())) {
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// count[0]++;
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// }
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//
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// if (!previousContent.getContent().equals(clipboardContent.getContent()) || count[0] > 1) {
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// systemClipboard.setContents(new TransferableImage((Image) clipboardContent.getContent()), null);
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//// systemClipboard.setContents(new StringSelection((String) clipboardContent.getContent()), null);
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// System.out.println("The clipboard contains: " + clipboardContent.getContent());
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//
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// DefaultListModel<String> demoList = new DefaultListModel<>();
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// int size = clipboardContentList.getModel().getSize();
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// demoList.addElement("0. " + clipboardContent.getContent());
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// for (int i = 0; i < size; i++) {
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// demoList.addElement((i + 1) + ". " + clipboardContentList.getModel().getElementAt(i));
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// }
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// clipboardContentList.setModel(demoList);
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//
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// previousContent.setContent(clipboardContent.getContent());
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// count[0] = 0;
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// }
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// });
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}
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systemClipboard.addFlavorListener(new FlavorListener() {
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public JPanel getClipboard() {
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@Override
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return Clipboard;
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public void flavorsChanged(FlavorEvent e) {
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}
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MyClipboardContent<?> clipboardContent = null;
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try {
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if (systemClipboard.isDataFlavorAvailable(DataFlavor.stringFlavor)) {
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String stringContent = (String) systemClipboard.getData(DataFlavor.stringFlavor);
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clipboardContent = new MyClipboardContent<>(stringContent);
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} else if (systemClipboard.isDataFlavorAvailable(DataFlavor.imageFlavor)) {
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Image imageContent = (Image) systemClipboard.getData(DataFlavor.imageFlavor);
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clipboardContent = new MyClipboardContent<>(imageContent);
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}
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} catch (UnsupportedFlavorException | IOException unsupportedFlavorException) {
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unsupportedFlavorException.printStackTrace();
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}
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if (previousContent.getContent().equals(clipboardContent.getContent())) {
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public static void main(String[] args) {
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count[0]++;
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SwingUtilities.invokeLater(() -> new ClipboardView().createAndShowGUI());
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}
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}
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if (!previousContent.getContent().equals(clipboardContent.getContent()) || count[0] > 1) {
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private void createAndShowGUI() {
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systemClipboard.setContents(new TransferableImage((Image) clipboardContent.getContent()), null);
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ClipboardListener listener = new ClipboardListener();
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// systemClipboard.setContents(new StringSelection((String) clipboardContent.getContent()), null);
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listener.setEntryListener(this);
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System.out.println("The clipboard contains: " + clipboardContent.getContent());
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listener.start();
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DefaultListModel<String> demoList = new DefaultListModel<>();
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JFrame jFrame = new JFrame();
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int size = clipboardContentList.getModel().getSize();
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jFrame.setTitle("My Clipboard History");
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demoList.addElement("0. " + clipboardContent.getContent());
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jFrame.setContentPane(Clipboard);
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for (int i = 0; i < size; i++) {
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jFrame.setVisible(true);
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demoList.addElement((i + 1) + ". " + clipboardContentList.getModel().getElementAt(i));
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jFrame.setAlwaysOnTop(true);
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}
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jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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clipboardContentList.setModel(demoList);
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jFrame.getContentPane().setBackground(new Color(1, 3, 25));
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jFrame.setPreferredSize(new Dimension(1000, 680));
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jFrame.setMaximumSize(new Dimension(1000, 680));
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jFrame.setResizable(false);
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jFrame.pack();
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jFrame.setLocationRelativeTo(null);
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}
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previousContent.setContent(clipboardContent.getContent());
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@Override
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count[0] = 0;
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public void onCopy(String data) {
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}
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listModel.add(0, data);
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}
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}
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});
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}
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public JPanel getClipboard() {
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return Clipboard;
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}
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}
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}
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