src/java.desktop/macosx/classes/com/apple/laf/AquaSplitPaneUI.java

/*
 * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.apple.laf;

import java.awt.event.*;
import java.beans.*;

import javax.swing.JComponent;
import javax.swing.border.Border;
import javax.swing.plaf.ComponentUI;
import javax.swing.plaf.basic.*;

public class AquaSplitPaneUI extends BasicSplitPaneUI implements MouseListener, PropertyChangeListener {
    static final String DIVIDER_PAINTER_KEY = "JSplitPane.dividerPainter";

    public AquaSplitPaneUI() {
        super();
    }

    public static ComponentUI createUI(final JComponent x) {
        return new AquaSplitPaneUI();
    }

    public BasicSplitPaneDivider createDefaultDivider() {
        return new AquaSplitPaneDividerUI(this);
    }

    protected void installListeners() {
        super.installListeners();
        splitPane.addPropertyChangeListener(DIVIDER_PAINTER_KEY, this);
        divider.addMouseListener(this);
    }

    protected void uninstallListeners() {
        divider.removeMouseListener(this);
        splitPane.removePropertyChangeListener(DIVIDER_PAINTER_KEY, this);
        super.uninstallListeners();
    }

    public void mouseClicked(final MouseEvent e) {
        if (e.getClickCount() < 2) return;
        if (!splitPane.isOneTouchExpandable()) return;

        final double resizeWeight = splitPane.getResizeWeight();
        final int paneWidth = splitPane.getWidth();
        final int divSize = splitPane.getDividerSize();
        final int divLocation = splitPane.getDividerLocation();
        final int lastDivLocation = splitPane.getLastDividerLocation();

        // if we are at the far edge
        if (paneWidth - divSize <= divLocation + 5) {
            splitPane.setDividerLocation(lastDivLocation);
            return;
        }

        // if we are at the starting edge
        if (divSize >= divLocation - 5) {
            splitPane.setDividerLocation(lastDivLocation);
            return;
        }

        // otherwise, jump to the most "appropriate" end
        if (resizeWeight > 0.5) {
            splitPane.setDividerLocation(0);
        } else {
            splitPane.setDividerLocation(paneWidth);
        }
    }

    public void mouseEntered(final MouseEvent e) { }
    public void mouseExited(final MouseEvent e) { }
    public void mousePressed(final MouseEvent e) { }
    public void mouseReleased(final MouseEvent e) { }

    public void propertyChange(final PropertyChangeEvent evt) {
        if (!DIVIDER_PAINTER_KEY.equals(evt.getPropertyName())) return;

        final Object value = evt.getNewValue();
        if (value instanceof Border) {
            divider.setBorder((Border)value);
        } else {
            divider.setBorder(null);
        }
    }
}