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Java - CUT&PASTE

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  1. package system.clipboard;
  2.  
  3. import java.awt.GridBagConstraints;
  4. import java.awt.GridBagLayout;
  5. import java.awt.datatransfer.Clipboard;
  6. import java.awt.datatransfer.ClipboardOwner;
  7. import java.awt.datatransfer.DataFlavor;
  8. import java.awt.datatransfer.StringSelection;
  9. import java.awt.datatransfer.Transferable;
  10. import java.awt.event.ActionEvent;
  11. import java.awt.event.ActionListener;	 
  12.  
  13. import javax.swing.JButton;
  14. import javax.swing.JFrame;
  15. import javax.swing.JTextArea;
  16.  
  17. public class ClipBoard extends JFrame implements ClipboardOwner, ActionListener
  18. {
  19. 	private static final long serialVersionUID = 1L;
  20.  
  21. 	JTextArea srcText, dstText;
  22. 	JButton copyButton, pasteButton;
  23. 	Clipboard clipboard = getToolkit().getSystemClipboard();
  24.  
  25. 	public ClipBoard()
  26. 	{
  27. 		super("Clipboard Test");
  28.  
  29. 		GridBagLayout gridbag = new GridBagLayout();
  30. 		GridBagConstraints c = new GridBagConstraints();
  31.  
  32. 		setLayout(gridbag);
  33.  
  34. 		srcText = new JTextArea(8, 32);
  35. 		c.gridwidth = 2;
  36. 		c.anchor = GridBagConstraints.CENTER;
  37. 		gridbag.setConstraints(srcText, c);
  38. 		add(srcText);
  39.  
  40. 		copyButton = new JButton("Copy Above");
  41. 		copyButton.setActionCommand("copy");
  42. 		copyButton.addActionListener(this);
  43. 		c.gridy = 1;
  44. 		c.gridwidth = 1;
  45. 		gridbag.setConstraints(copyButton, c);
  46. 		add(copyButton);
  47.  
  48. 		pasteButton = new JButton("Paste Below");
  49. 		pasteButton.setActionCommand("paste");
  50. 		pasteButton.addActionListener(this);
  51. 		pasteButton.setEnabled(false);
  52. 		c.gridx = 1;
  53. 		gridbag.setConstraints(pasteButton, c);
  54. 		add(pasteButton);
  55.  
  56. 		dstText = new JTextArea(8, 32);
  57. 		c.gridx = 0;
  58. 		c.gridy = 2;
  59. 		c.gridwidth = 2;
  60. 		gridbag.setConstraints(dstText, c);
  61. 		add(dstText);
  62.  
  63. 		pack();
  64. 	}
  65.  
  66. 	public void actionPerformed(ActionEvent evt)
  67. 	{
  68. 		String cmd = evt.getActionCommand();
  69.  
  70. 		if(cmd.equals("copy")) 
  71. 		{
  72. 			// Implement Copy operation
  73. 			String srcData = srcText.getText();
  74.  
  75. 			if(srcData != null)
  76. 			{
  77. 				StringSelection contents = new StringSelection(srcData);
  78. 				clipboard.setContents(contents, this);
  79. 				pasteButton.setEnabled(true);
  80. 			}
  81. 		}
  82. 		else if(cmd.equals("paste"))
  83. 		{
  84. 			// Implement Paste operation
  85. 			Transferable content = clipboard.getContents(this);
  86. 			if(content != null) 
  87. 			{
  88. 				try
  89. 				{
  90. 					String dstData = (String) content.getTransferData(DataFlavor.stringFlavor);
  91. 					dstText.append(dstData);
  92. 				}
  93. 				catch(Exception e)
  94. 				{
  95. 					System.out.println("Couldn't get contents in format: " + DataFlavor.stringFlavor.getHumanPresentableName());
  96. 				}
  97. 			}
  98. 		}
  99. 	}
  100.  
  101. 	public void lostOwnership(Clipboard clipboard, Transferable contents)
  102. 	{
  103. 		System.out.println("Clipboard contents replaced");
  104. 	}
  105.  
  106. 	public static void main(String[] args) 
  107. 	{
  108. 		ClipBoard test = new ClipBoard();
  109. 		test.setVisible(true);
  110. 	}
  111. }

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