MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

import java.awt.Button;
import java.awt.Frame;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.TextArea;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.ClipboardOwner;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.Transferable;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

/** Taken from the Sun documentation on Clipboard API */
public class MainClass extends Frame implements ClipboardOwner, ActionListener {

    TextArea srcText, dstText;

    Button copyButton, pasteButton;

    Clipboard clipboard = getToolkit().getSystemClipboard();

    public MainClass() {
        super("Clipboard Test");
        GridBagLayout gridbag = new GridBagLayout();
        GridBagConstraints c = new GridBagConstraints();
        setLayout(gridbag);

        srcText = new TextArea(8, 32);
        c.gridwidth = 2;
        c.anchor = GridBagConstraints.CENTER;
        gridbag.setConstraints(srcText, c);
        add(srcText);

        copyButton = new Button("Copy Above");
        copyButton.setActionCommand("copy");
        copyButton.addActionListener(this);
        c.gridy = 1;
        c.gridwidth = 1;
        gridbag.setConstraints(copyButton, c);
        add(copyButton);

        pasteButton = new Button("Paste Below");
        pasteButton.setActionCommand("paste");
        pasteButton.addActionListener(this);
        pasteButton.setEnabled(false);
        c.gridx = 1;
        gridbag.setConstraints(pasteButton, c);
        add(pasteButton);

        dstText = new TextArea(8, 32);
        c.gridx = 0;
        c.gridy = 2;
        c.gridwidth = 2;
        gridbag.setConstraints(dstText, c);
        add(dstText);

        pack();
    }

    public void actionPerformed(ActionEvent evt) {
        String cmd = evt.getActionCommand();

        if (cmd.equals("copy")) {
            // Implement Copy operation
            String srcData = srcText.getText();
            if (srcData != null) {
                StringSelection contents = new StringSelection(srcData);
                clipboard.setContents(contents, this);
                pasteButton.setEnabled(true);
            }
        } else if (cmd.equals("paste")) {
            // Implement Paste operation
            Transferable content = clipboard.getContents(this);
            if (content != null) {
                try {
                    String dstData = (String) content.getTransferData(DataFlavor.stringFlavor);
                    dstText.append(dstData);
                } catch (Exception e) {
                    System.out.println("Couldn't get contents in format: "
                            + DataFlavor.stringFlavor.getHumanPresentableName());
                }
            }
        }
    }

    public void lostOwnership(Clipboard clipboard, Transferable contents) {
        System.out.println("Clipboard contents replaced");
    }

    public static void main(String[] args) {
        MainClass test = new MainClass();
        test.setVisible(true);
    }
}