Source Code Cross Referenced for BasicHTML.java in  » Apache-Harmony-Java-SE » javax-package » javax » swing » plaf » basic » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Apache Harmony Java SE » javax package » javax.swing.plaf.basic 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  Licensed to the Apache Software Foundation (ASF) under one or more
003:         *  contributor license agreements.  See the NOTICE file distributed with
004:         *  this work for additional information regarding copyright ownership.
005:         *  The ASF licenses this file to You under the Apache License, Version 2.0
006:         *  (the "License"); you may not use this file except in compliance with
007:         *  the License.  You may obtain a copy of the License at
008:         *
009:         *     http://www.apache.org/licenses/LICENSE-2.0
010:         *
011:         *  Unless required by applicable law or agreed to in writing, software
012:         *  distributed under the License is distributed on an "AS IS" BASIS,
013:         *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         *  See the License for the specific language governing permissions and
015:         *  limitations under the License.
016:         */
017:
018:        package javax.swing.plaf.basic;
019:
020:        import java.awt.Container;
021:        import java.awt.Graphics;
022:        import java.awt.Rectangle;
023:        import java.awt.Shape;
024:        import java.io.Reader;
025:        import java.io.StringReader;
026:
027:        import javax.swing.JComponent;
028:        import javax.swing.text.AttributeSet;
029:        import javax.swing.text.BadLocationException;
030:        import javax.swing.text.Document;
031:        import javax.swing.text.Element;
032:        import javax.swing.text.Position;
033:        import javax.swing.text.View;
034:        import javax.swing.text.ViewFactory;
035:        import javax.swing.text.Position.Bias;
036:        import javax.swing.text.html.HTMLEditorKit;
037:
038:        public class BasicHTML {
039:
040:            public static final String documentBaseKey = "html.base"; //$NON-NLS-1
041:
042:            public static final String propertyKey = "html"; //$NON-NLS-1
043:
044:            /**
045:             * Used to detect HTML strings in {@link #isHTMLString(String)}.
046:             */
047:            private static final String detectString = "<html"; //$NON-NLS-1
048:
049:            public static void updateRenderer(JComponent c, String text) {
050:                c.putClientProperty(propertyKey,
051:                        (isHTMLString(text) ? createHTMLView(c, text) : null));
052:            }
053:
054:            public static boolean isHTMLString(String s) {
055:                // Maybe s.trim() would be useful but RI doesn't do it.
056:                return ((s != null) && s.toLowerCase().startsWith(detectString));
057:            }
058:
059:            public static View createHTMLView(JComponent c, String html) {
060:                return new Renderer(c, html);
061:            }
062:
063:            /**
064:             * Renderer is a RootView for the views obtained from html string.
065:             */
066:            static class Renderer extends View {
067:
068:                /**
069:                 * JComponent that uses this Renderer to draw itself
070:                 */
071:                private final JComponent component;
072:
073:                /**
074:                 * Son view is a view that do all the job. But it haven't reference to
075:                 * factory and styles
076:                 */
077:                private final View son;
078:
079:                /**
080:                 * The factory obtained from HTMLEditorKit
081:                 */
082:                private final ViewFactory factory;
083:
084:                Renderer(JComponent component, String html) {
085:
086:                    super (null);
087:                    this .component = component;
088:
089:                    HTMLEditorKit kit = new HTMLEditorKit();
090:                    Document doc = kit.createDefaultDocument();
091:                    Reader r = new StringReader(html);
092:
093:                    try {
094:                        kit.read(r, doc, 0);
095:                    } catch (Throwable e) {
096:                        // Ignored for now. Need to be tested
097:                    }
098:
099:                    factory = kit.getViewFactory();
100:                    son = factory.create(doc.getDefaultRootElement());
101:                    son.setParent(this );
102:                }
103:
104:                @Override
105:                public AttributeSet getAttributes() {
106:                    return null;
107:                }
108:
109:                @Override
110:                public float getPreferredSpan(int axis) {
111:                    return son.getPreferredSpan(axis);
112:                }
113:
114:                @Override
115:                public void preferenceChanged(View child, boolean width,
116:                        boolean height) {
117:                    component.repaint();
118:                }
119:
120:                @Override
121:                public void paint(Graphics g, Shape allocation) {
122:                    Rectangle rect = allocation.getBounds();
123:                    son.setSize(rect.width, rect.height);
124:                    son.paint(g, allocation);
125:                }
126:
127:                @Override
128:                public int getViewCount() {
129:                    return 1;
130:                }
131:
132:                @Override
133:                public View getView(int i) {
134:                    return son;
135:                }
136:
137:                @Override
138:                public int viewToModel(float x, float y, Shape a,
139:                        Position.Bias[] bias) {
140:                    return son.viewToModel(x, y, a, bias);
141:                }
142:
143:                @Override
144:                public Element getElement() {
145:                    return son.getElement();
146:                }
147:
148:                @Override
149:                public Container getContainer() {
150:                    return component;
151:                }
152:
153:                @Override
154:                public ViewFactory getViewFactory() {
155:                    return factory;
156:                }
157:
158:                @Override
159:                public Shape modelToView(int pos, Shape shape, Bias bias)
160:                        throws BadLocationException {
161:                    return son.modelToView(pos, shape, bias);
162:                }
163:
164:            }
165:
166:        }
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