Check updates to clipboard every 200ms

src/main/java/me/goudham/ClipboardListener.java

@@ -4,6 +4,7 @@ import me.goudham.listener.ClipboardEvent;
 import me.goudham.model.MyClipboardContent;
 import org.jetbrains.annotations.NotNull;
 
+import java.awt.HeadlessException;
 import java.awt.Image;
 import java.awt.Toolkit;
 import java.awt.datatransfer.Clipboard;
@@ -12,6 +13,9 @@ import java.awt.datatransfer.DataFlavor;
 import java.awt.datatransfer.Transferable;
 import java.awt.datatransfer.UnsupportedFlavorException;
 import java.io.IOException;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
 
 public class ClipboardListener extends Thread implements ClipboardOwner {
     private final Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
@@ -25,7 +29,8 @@ public class ClipboardListener extends Thread implements ClipboardOwner {
     public void lostOwnership(Clipboard oldClipboard, Transferable oldClipboardContents) {
         try {
             sleep(200);
-        } catch (InterruptedException ignored) { }
+        } catch (InterruptedException ignored) {
+        }
 
         Transferable newClipboardContents = oldClipboard.getContents(currentThread());
         processContents(oldClipboard, newClipboardContents);
@@ -37,13 +42,14 @@ public class ClipboardListener extends Thread implements ClipboardOwner {
 
         try {
             if (oldClipboard.isDataFlavorAvailable(DataFlavor.stringFlavor)) {
-                    String stringContent = (String) newClipboardContents.getTransferData(DataFlavor.stringFlavor);
-                    clipboardContent = new MyClipboardContent<>(stringContent);
-                } else if (oldClipboard.isDataFlavorAvailable(DataFlavor.imageFlavor)) {
-                    Image imageContent = (Image) newClipboardContents.getTransferData(DataFlavor.imageFlavor);
-                    clipboardContent = new MyClipboardContent<>(imageContent);
-                }
-        } catch (UnsupportedFlavorException | IOException ignored) { }
+                String stringContent = (String) newClipboardContents.getTransferData(DataFlavor.stringFlavor);
+                clipboardContent = new MyClipboardContent<>(stringContent);
+            } else if (oldClipboard.isDataFlavorAvailable(DataFlavor.imageFlavor)) {
+                Image imageContent = (Image) newClipboardContents.getTransferData(DataFlavor.imageFlavor);
+                clipboardContent = new MyClipboardContent<>(imageContent);
+            }
+        } catch (UnsupportedFlavorException | IOException ignored) {
+        }
 
         clipboardEvent.onCopy(clipboardContent);
     }
@@ -53,9 +59,28 @@ public class ClipboardListener extends Thread implements ClipboardOwner {
     }
 
     public void run() {
-        Transferable currentClipboardContents = clipboard.getContents(currentThread());
-        processContents(clipboard, currentClipboardContents);
-        regainOwnership(clipboard, currentClipboardContents);
+        Transferable currentClipboardContents = clipboard.getContents(null);
+
+        final MyClipboardContent<String>[] recentContent = new MyClipboardContent[]{new MyClipboardContent<>("")};
+        try {
+            recentContent[0].setContent(currentClipboardContents.getTransferData(DataFlavor.stringFlavor));
+        } catch (UnsupportedFlavorException | IOException e) {
+            e.printStackTrace();
+        }
+
+        ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor();
+        executor.scheduleAtFixedRate(() -> {
+            try {
+                Transferable newClipboard = clipboard.getContents(null);
+                String data = (String) newClipboard.getTransferData(DataFlavor.stringFlavor);
+                if (!data.equals(recentContent[0].getContent())) {
+                    clipboardEvent.onCopy(new MyClipboardContent<>(data));
+                    recentContent[0].setContent(data);
+                }
+            } catch (HeadlessException | IOException | UnsupportedFlavorException e) {
+                e.printStackTrace();
+            }
+        }, 0, 200, TimeUnit.MILLISECONDS);
     }
 
     public void setClipboardEvent(@NotNull ClipboardEvent clipboardEvent) {

src/main/java/me/goudham/view/ClipboardView.java

@@ -4,15 +4,24 @@ import me.goudham.ClipboardListener;
 import me.goudham.listener.ClipboardEvent;
 import me.goudham.model.MyClipboardContent;
 
+import javax.swing.AbstractAction;
+import javax.swing.Action;
+import javax.swing.ActionMap;
 import javax.swing.BorderFactory;
 import javax.swing.DefaultListModel;
+import javax.swing.InputMap;
 import javax.swing.JButton;
 import javax.swing.JFrame;
 import javax.swing.JLabel;
 import javax.swing.JList;
 import javax.swing.JPanel;
 import javax.swing.JScrollPane;
+import javax.swing.KeyStroke;
 import java.awt.Dimension;
+import java.awt.Toolkit;
+import java.awt.event.ActionEvent;
+import java.awt.event.KeyEvent;
+import java.awt.event.KeyListener;
 
 public class ClipboardView implements ClipboardEvent {
     private JPanel Clipboard;