1 /*

     2  * CDDL HEADER START

     3  *

     4  * The contents of this file are subject to the terms of the

     5  * Common Development and Distribution License (the "License").

     6  * You may not use this file except in compliance with the License.

     7  *

     8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE

     9  * or http://www.opensolaris.org/os/licensing.

    10  * See the License for the specific language governing permissions

    11  * and limitations under the License.

    12  *

    13  * When distributing Covered Code, include this CDDL HEADER in each

    14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.

    15  * If applicable, add the following below this CDDL HEADER, with the

    16  * fields enclosed by brackets "[]" replaced with your own identifying

    17  * information: Portions Copyright [yyyy] [name of copyright owner]

    18  *

    19  * CDDL HEADER END

    20  */

    21 

    22 /*

    23  * Copyright (c) 2010, 2012, Oracle and/or its affiliates. All rights reserved.

    24  */

    25 

    26 package com.oracle.solaris.vp.util.swing;

    27 

    28 import java.awt.*;

    29 import javax.swing.*;

    30 import javax.swing.plaf.basic.*;

    31 

    32 @SuppressWarnings({"serial"})

    33 public class ExtScrollPane extends JScrollPane {

    34     //

    35     // Instance data

    36     //

    37 

    38     private int defaultUnitInc;

    39 

    40     //

    41     // Constructors

    42     //

    43 

    44     public ExtScrollPane() {

    45 	init();

    46     }

    47 

    48     public ExtScrollPane(Component view) {

    49 	super(view);

    50 	init();

    51     }

    52 

    53     public ExtScrollPane(Component view, int vsbPolicy, int hsbPolicy) {

    54 	super(view, vsbPolicy, hsbPolicy);

    55 	init();

    56     }

    57 

    58     public ExtScrollPane(int vsbPolicy, int hsbPolicy) {

    59 	super(vsbPolicy, hsbPolicy);

    60 	init();

    61     }

    62 

    63     //

    64     // JComponent methods

    65     //

    66 

    67     /**

    68      * Sets the opacity of this {@code JScrollPane} and its {@code JViewport}.

    69      */

    70     @Override

    71     public void setOpaque(boolean opaque) {

    72 	super.setOpaque(opaque);

    73 	getViewport().setOpaque(opaque);

    74     }

    75 

    76     //

    77     // JScrollPane methods

    78     //

    79 

    80     @Override

    81     protected JViewport createViewport() {

    82         return new JViewport() {

    83 	    @Override

    84 	    public void setView(Component view) {

    85 		Component oldView = getView();

    86 		if (oldView != view) {

    87 		    super.setView(view);

    88 		    if (view != null) {

    89 			setUnitIncrement();

    90 		    }

    91 		}

    92 	    }

    93 	};

    94     }

    95 

    96     //

    97     // ExtScrollPane methods

    98     //

    99 

   100     public void removeBorder() {

   101 	removeBorder(this);

   102     }

   103 

   104     public int getDefaultUnitIncrement() {

   105 	if (defaultUnitInc == 0) {

   106 	    defaultUnitInc = GUIUtil.getScrollableUnitIncrement();

   107 	}

   108 	return defaultUnitInc;

   109     }

   110 

   111     public void setDefaultUnitIncrement(int defaultUnitInc) {

   112 	if (this.defaultUnitInc != defaultUnitInc) {

   113 	    this.defaultUnitInc = defaultUnitInc;

   114 	    setUnitIncrement();

   115 	}

   116     }

   117 

   118     //

   119     // Private methods

   120     //

   121 

   122     private void init() {

   123 	setOpaque(false);

   124     }

   125 

   126     private void setUnitIncrement() {

   127 	int defaultUnitInc = getDefaultUnitIncrement();

   128 	int hInc = defaultUnitInc;

   129 	JScrollBar hScroll = getHorizontalScrollBar();

   130 

   131 	int vInc = defaultUnitInc;

   132 	JScrollBar vScroll = getVerticalScrollBar();

   133 

   134 	Component view = getViewport().getView();

   135 

   136 	if (view instanceof Scrollable) {

   137 	    Scrollable scrollable = (Scrollable)view;

   138 	    Rectangle r = viewport.getViewRect();

   139 

   140 	    hInc = scrollable.getScrollableUnitIncrement(

   141 		r, hScroll.getOrientation(), 1);

   142 

   143 	    vInc = scrollable.getScrollableUnitIncrement(

   144 		r, hScroll.getOrientation(), 1);

   145 	}

   146 

   147 	getHorizontalScrollBar().setUnitIncrement(hInc);

   148 	getVerticalScrollBar().setUnitIncrement(vInc);

   149     }

   150 

   151     //

   152     // Static methods

   153     //

   154 

   155     /**

   156      * Removes the border from the given {@code JScrollPane}.  Since some

   157      * UIs show a border under all circumstances (synth, for example), this is

   158      * more involved than setting the border to {@code null}.

   159      */

   160     public static void removeBorder(JScrollPane scroll) {

   161 	scroll.setUI(new BasicScrollPaneUI());

   162 

   163 	// Setting to null would result in a default border

   164 	scroll.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 0));

   165 

   166 	scroll.getViewport().setUI(new BasicViewportUI());

   167     }

   168 }