/*
 * @(#)PasteAction.java
 *
 * Copyright (c) 1996-2010 The authors and contributors of JHotDraw.
 * You may not use, copy or modify this file, except in compliance with the 
 * accompanying license terms.
 */
package org.jhotdraw.app.action.edit;

import javax.annotation.Nullable;
import java.awt.*;
import java.awt.datatransfer.*;
import java.awt.event.*;
import javax.swing.*;
import org.jhotdraw.gui.datatransfer.ClipboardUtil;
import org.jhotdraw.util.*;

/**
 * Pastes the contents of the system clipboard at the caret position.
 * <p>
 * This action acts on the last {@link org.jhotdraw.gui.EditableComponent} /
 * {@code JTextComponent} which had the focus when the {@code ActionEvent}
 * was generated.
 * <p>
 * This action is called when the user selects the Paste item in the Edit
 * menu. The menu item is automatically created by the application.
 * <p>
 * If you want this behavior in your application, you have to create an action
 * with this ID and put it in your {@code ApplicationModel} in method
 * {@link org.jhotdraw.app.ApplicationModel#initApplication}.
 *
 * @author Werner Randelshofer
 * @version $Id$
 */
public class PasteAction extends AbstractSelectionAction {
    private static final long serialVersionUID = 1L;

    public static final String ID = "edit.paste";

    /** Creates a new instance which acts on the currently focused component. */
    public PasteAction() {
        this(null);
    }

    /** Creates a new instance which acts on the specified component.
     *
     * @param target The target of the action. Specify null for the currently
     * focused component.
     */
    public PasteAction(@Nullable JComponent target) {
        super(target);
        ResourceBundleUtil labels = ResourceBundleUtil.getBundle("org.jhotdraw.app.Labels");
        labels.configureAction(this, ID);
    }

    @Override
    public void actionPerformed(ActionEvent evt) {
        JComponent c = target;
        if (c == null && (KeyboardFocusManager.getCurrentKeyboardFocusManager().
                getPermanentFocusOwner() instanceof JComponent)) {
            c = (JComponent) KeyboardFocusManager.getCurrentKeyboardFocusManager().
                    getPermanentFocusOwner();
        }
        if (c != null && c.isEnabled()) {
            Transferable t = ClipboardUtil.getClipboard().getContents(c);
            if (t != null && c.getTransferHandler() != null) {
                c.getTransferHandler().importData(
                        c,
                        t);
            }
        }
    }
    @Override
    protected void updateEnabled() {
        if (target != null) {
            setEnabled(target.isEnabled());
        }
    }
}