001 /*
002 * Copyright 1997-1999 Sun Microsystems, Inc. All Rights Reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation. Sun designates this
008 * particular file as subject to the "Classpath" exception as provided
009 * by Sun in the LICENSE file that accompanied this code.
010 *
011 * This code is distributed in the hope that it will be useful, but WITHOUT
012 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
014 * version 2 for more details (a copy is included in the LICENSE file that
015 * accompanied this code).
016 *
017 * You should have received a copy of the GNU General Public License version
018 * 2 along with this work; if not, write to the Free Software Foundation,
019 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020 *
021 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022 * CA 95054 USA or visit www.sun.com if you need additional information or
023 * have any questions.
024 */
025 package javax.swing.text.html;
026
027 import java.util.Enumeration;
028 import java.awt.*;
029 import javax.swing.text.*;
030
031 /**
032 * A view implementation to display an html list
033 *
034 * @author Timothy Prinzing
035 * @version 1.35 05/05/07
036 */
037 public class ListView extends BlockView {
038
039 /**
040 * Creates a new view that represents a list element.
041 *
042 * @param elem the element to create a view for
043 */
044 public ListView(Element elem) {
045 super (elem, View.Y_AXIS);
046 }
047
048 /**
049 * Calculates the desired shape of the list.
050 *
051 * @return the desired span
052 * @see View#getPreferredSpan
053 */
054 public float getAlignment(int axis) {
055 switch (axis) {
056 case View.X_AXIS:
057 return 0.5f;
058 case View.Y_AXIS:
059 return 0.5f;
060 default:
061 throw new IllegalArgumentException("Invalid axis: " + axis);
062 }
063 }
064
065 /**
066 * Renders using the given rendering surface and area on that
067 * surface.
068 *
069 * @param g the rendering surface to use
070 * @param allocation the allocated region to render into
071 * @see View#paint
072 */
073 public void paint(Graphics g, Shape allocation) {
074 super .paint(g, allocation);
075 Rectangle alloc = allocation.getBounds();
076 Rectangle clip = g.getClipBounds();
077 // Since listPainter paints in the insets we have to check for the
078 // case where the child is not painted because the paint region is
079 // to the left of the child. This assumes the ListPainter paints in
080 // the left margin.
081 if ((clip.x + clip.width) < (alloc.x + getLeftInset())) {
082 Rectangle childRect = alloc;
083 alloc = getInsideAllocation(allocation);
084 int n = getViewCount();
085 int endY = clip.y + clip.height;
086 for (int i = 0; i < n; i++) {
087 childRect.setBounds(alloc);
088 childAllocation(i, childRect);
089 if (childRect.y < endY) {
090 if ((childRect.y + childRect.height) >= clip.y) {
091 listPainter.paint(g, childRect.x, childRect.y,
092 childRect.width, childRect.height,
093 this , i);
094 }
095 } else {
096 break;
097 }
098 }
099 }
100 }
101
102 /**
103 * Paints one of the children; called by paint(). By default
104 * that is all it does, but a subclass can use this to paint
105 * things relative to the child.
106 *
107 * @param g the graphics context
108 * @param alloc the allocated region to render the child into
109 * @param index the index of the child
110 */
111 protected void paintChild(Graphics g, Rectangle alloc, int index) {
112 listPainter.paint(g, alloc.x, alloc.y, alloc.width,
113 alloc.height, this , index);
114 super .paintChild(g, alloc, index);
115 }
116
117 protected void setPropertiesFromAttributes() {
118 super .setPropertiesFromAttributes();
119 listPainter = getStyleSheet().getListPainter(getAttributes());
120 }
121
122 private StyleSheet.ListPainter listPainter;
123 }
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