TextCopyPaste.java

/*
 * MediathekView
 * Copyright (C) 2014 W. Xaver
 * W.Xaver[at]googlemail.com
 * http://zdfmediathk.sourceforge.net/
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
package mediathek.tool;

import javax.swing.*;
import javax.swing.text.JTextComponent;
import java.awt.*;
import java.awt.datatransfer.DataFlavor;
import java.awt.event.ActionEvent;
import java.awt.event.InputEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

@SuppressWarnings("serial")
public class TextCopyPaste extends MouseAdapter {

    private final JPopupMenu popup = new JPopupMenu();

    private final Action cutAction;
    private final Action copyAction;
    private final Action pasteAction;
    private final Action undoAction;
    private final Action selectAllAction;

    private JTextComponent textComponent;
    private String savedString = "";
    private Actions lastActionSelected;

    private enum Actions {
        UNDO, CUT, COPY, PASTE, SELECT_ALL
    }

    public TextCopyPaste() {
        undoAction = new AbstractAction("Zurück") {
            @Override
            public void actionPerformed(ActionEvent ae) {
                textComponent.setText("");
                textComponent.replaceSelection(savedString);

                lastActionSelected = Actions.UNDO;
            }
        };

        popup.add(undoAction);
        popup.addSeparator();

        cutAction = new AbstractAction("Ausschneiden") {
            @Override
            public void actionPerformed(ActionEvent ae) {
                lastActionSelected = Actions.CUT;
                savedString = textComponent.getText();
                textComponent.cut();
            }
        };

        popup.add(cutAction);

        copyAction = new AbstractAction("Kopieren") {
            @Override
            public void actionPerformed(ActionEvent ae) {
                lastActionSelected = Actions.COPY;
                textComponent.copy();
            }
        };

        popup.add(copyAction);

        pasteAction = new AbstractAction("Einfügen") {
            @Override
            public void actionPerformed(ActionEvent ae) {
                lastActionSelected = Actions.PASTE;
                savedString = textComponent.getText();
                textComponent.paste();
            }
        };

        popup.add(pasteAction);
        popup.addSeparator();

        selectAllAction = new AbstractAction("Alles markieren") {
            @Override
            public void actionPerformed(ActionEvent ae) {
                lastActionSelected = Actions.SELECT_ALL;
                textComponent.selectAll();
            }
        };

        popup.add(selectAllAction);
    }

    @Override
    public void mouseClicked(MouseEvent e) {
        if (e.getModifiers() == InputEvent.BUTTON3_MASK) {
            if (!(e.getSource() instanceof JTextComponent)) {
                return;
            }
            textComponent = (JTextComponent) e.getSource();
            textComponent.requestFocus();

            boolean enabled = textComponent.isEnabled();
            boolean editable = textComponent.isEditable();
            boolean nonempty = !(textComponent.getText() == null || textComponent.getText().isEmpty());
            boolean marked = textComponent.getSelectedText() != null;

            boolean pasteAvailable = Toolkit.getDefaultToolkit().getSystemClipboard().getContents(null).isDataFlavorSupported(DataFlavor.stringFlavor);

            undoAction.setEnabled(enabled && editable && (lastActionSelected == Actions.CUT || lastActionSelected == Actions.PASTE));
            cutAction.setEnabled(enabled && editable && marked);
            copyAction.setEnabled(enabled && marked);
            pasteAction.setEnabled(enabled && editable && pasteAvailable);
            selectAllAction.setEnabled(enabled && nonempty);

            int nx = e.getX();

            if (nx > 500) {
                nx = nx - popup.getSize().width;
            }

            popup.show(e.getComponent(), nx, e.getY() - popup.getSize().height);
        }
    }

}