HistoryPanel.java

/*
 * Copyright 2016 Laszlo Balazs-Csiki
 *
 * This file is part of Pixelitor. Pixelitor is free software: you
 * can redistribute it and/or modify it under the terms of the GNU
 * General Public License, version 3 as published by the Free
 * Software Foundation.
 *
 * Pixelitor 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 Pixelitor. If not, see <http://www.gnu.org/licenses/>.
 */

package pixelitor.history;

import pixelitor.utils.IconUtils;

import javax.swing.*;
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.event.ActionListener;

public class HistoryPanel extends JPanel {
    private final JButton undoButton;
    private final JButton redoButton;
    private final PixelitorUndoManager pum;

    public HistoryPanel(PixelitorUndoManager pum, JList historyList) {
        this.pum = pum;
        setLayout(new BorderLayout());
        add(new JScrollPane(historyList), BorderLayout.CENTER);
        JPanel buttonsPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));

        Icon undoIcon = IconUtils.getUndoIcon();
        Icon redoIcon = IconUtils.getRedoIcon();

        undoButton = createButton(undoIcon, "undo",
                "AbstractUndoableEdit.undoText", History.UNDO_ACTION);
        redoButton = createButton(redoIcon, "redo",
                "AbstractUndoableEdit.redoText", History.REDO_ACTION);

        History.addUndoableEditListener(e -> updateEnabledState());
        updateEnabledState();

        buttonsPanel.add(undoButton);
        buttonsPanel.add(redoButton);
        add(buttonsPanel, BorderLayout.SOUTH);
    }

    private static JButton createButton(Icon icon, String name, String tooltipResource, ActionListener actionListener) {
        JButton b = new JButton(icon);
        b.setName(name);
        b.setToolTipText(UIManager.getString(tooltipResource));
        b.addActionListener(actionListener);
        return b;
    }

    private void updateEnabledState() {
        undoButton.setEnabled(pum.canUndo());
        redoButton.setEnabled(pum.canRedo());
    }
}