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308 lines
8.6 KiB
Java
308 lines
8.6 KiB
Java
/* InlineView.java -- Renders HTML content
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Copyright (C) 2006 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package javax.swing.text.html;
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import java.awt.FontMetrics;
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import java.awt.Shape;
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import java.text.BreakIterator;
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import javax.swing.event.DocumentEvent;
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import javax.swing.text.AttributeSet;
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import javax.swing.text.BadLocationException;
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import javax.swing.text.Document;
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import javax.swing.text.Element;
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import javax.swing.text.LabelView;
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import javax.swing.text.Segment;
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import javax.swing.text.View;
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import javax.swing.text.ViewFactory;
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/**
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* Renders HTML content (identified by {@link HTML.Tag#CONTENT}). This is
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* basically a {@link LabelView} that is adjusted to understand styles defined
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* by stylesheets.
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*
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* @author Roman Kennke (kennke@aicas.com)
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*/
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public class InlineView
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extends LabelView
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{
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/**
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* The attributes used by this view.
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*/
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private AttributeSet attributes;
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/**
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* The span of the longest word in this view.
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*
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* @see #getLongestWord()
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*/
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private float longestWord;
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/**
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* Indicates if we may wrap or not.
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*/
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private boolean nowrap;
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/**
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* Creates a new <code>InlineView</code> that renders the specified element.
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*
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* @param element the element for this view
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*/
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public InlineView(Element element)
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{
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super(element);
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}
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/**
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* Receives notification that something was inserted into the document in
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* a location that this view is responsible for.
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*
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* @param e the document event
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* @param a the current allocation of this view
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* @param f the view factory for creating new views
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*
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* @since 1.5
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*/
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public void insertUpdate(DocumentEvent e, Shape a, ViewFactory f)
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{
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// FIXME: What to do here?
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super.insertUpdate(e, a, f);
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}
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/**
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* Receives notification that something was removed from the document in
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* a location that this view is responsible for.
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*
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* @param e the document event
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* @param a the current allocation of this view
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* @param f the view factory for creating new views
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*
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* @since 1.5
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*/
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public void removeUpdate(DocumentEvent e, Shape a, ViewFactory f)
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{
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// FIXME: What to do here?
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super.removeUpdate(e, a, f);
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}
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/**
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* Receives notification that attributes have changed in the document in
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* a location that this view is responsible for. This calls
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* {@link #setPropertiesFromAttributes}.
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*
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* @param e the document event
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* @param a the current allocation of this view
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* @param f the view factory for creating new views
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*
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* @since 1.5
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*/
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public void changedUpdate(DocumentEvent e, Shape a, ViewFactory f)
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{
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super.changedUpdate(e, a, f);
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StyleSheet ss = getStyleSheet();
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attributes = ss.getViewAttributes(this);
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preferenceChanged(null, true, true);
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setPropertiesFromAttributes();
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}
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/**
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* Returns the attributes that are used for rendering. This is implemented
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* to multiplex the attributes specified in the model with a stylesheet.
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*
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* @return the attributes that are used for rendering
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*/
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public AttributeSet getAttributes()
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{
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if (attributes == null)
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{
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StyleSheet ss = getStyleSheet();
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attributes = ss.getViewAttributes(this);
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}
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return attributes;
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}
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public int getBreakWeight(int axis, float pos, float len)
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{
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int weight;
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if (nowrap)
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weight = BadBreakWeight;
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else
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weight = super.getBreakWeight(axis, pos, len);
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return weight;
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}
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public View breakView(int axis, int offset, float pos, float len)
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{
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// FIXME: Implement this.
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return super.breakView(axis, offset, pos, len);
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}
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/**
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* Loads the character style properties from the stylesheet.
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*/
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protected void setPropertiesFromAttributes()
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{
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super.setPropertiesFromAttributes();
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AttributeSet atts = getAttributes();
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Object o = atts.getAttribute(CSS.Attribute.TEXT_DECORATION);
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// Check for underline.
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boolean b = false;
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if (o != null && o.toString().contains("underline"))
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b = true;
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setUnderline(b);
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// Check for line-through.
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b = false;
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if (o != null && o.toString().contains("line-through"))
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b = true;
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setStrikeThrough(b);
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// Check for vertical alignment (subscript/superscript).
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o = atts.getAttribute(CSS.Attribute.VERTICAL_ALIGN);
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// Subscript.
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b = false;
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if (o != null && o.toString().contains("sub"))
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b = true;
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setSubscript(b);
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// Superscript.
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b = false;
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if (o != null && o.toString().contains("sup"))
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b = true;
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setSuperscript(b);
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// Fetch nowrap setting.
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o = atts.getAttribute(CSS.Attribute.WHITE_SPACE);
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if (o != null && o.equals("nowrap"))
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nowrap = true;
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else
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nowrap = false;
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}
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/**
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* Returns the stylesheet used by this view. This returns the stylesheet
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* of the <code>HTMLDocument</code> that is rendered by this view.
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*
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* @return the stylesheet used by this view
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*/
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protected StyleSheet getStyleSheet()
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{
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Document doc = getDocument();
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StyleSheet styleSheet = null;
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if (doc instanceof HTMLDocument)
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styleSheet = ((HTMLDocument) doc).getStyleSheet();
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return styleSheet;
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}
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/**
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* Returns the minimum span for the specified axis. This returns the
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* width of the longest word for the X axis and the super behaviour for
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* the Y axis. This is a slight deviation from the reference implementation.
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* IMO this should improve rendering behaviour so that an InlineView never
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* gets smaller than the longest word in it.
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*/
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public float getMinimumSpan(int axis)
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{
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float min = super.getMinimumSpan(axis);
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if (axis == X_AXIS)
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min = Math.max(getLongestWord(), min);
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return min;
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}
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/**
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* Returns the span of the longest word in this view.
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*
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* @return the span of the longest word in this view
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*/
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private float getLongestWord()
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{
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if (longestWord == -1)
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longestWord = calculateLongestWord();
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return longestWord;
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}
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/**
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* Calculates the span of the longest word in this view.
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*
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* @return the span of the longest word in this view
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*/
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private float calculateLongestWord()
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{
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float span = 0;
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try
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{
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Document doc = getDocument();
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int p0 = getStartOffset();
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int p1 = getEndOffset();
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Segment s = new Segment();
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doc.getText(p0, p1 - p0, s);
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BreakIterator iter = BreakIterator.getWordInstance();
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iter.setText(s);
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int wordStart = p0;
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int wordEnd = p0;
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int start = iter.first();
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for (int end = iter.next(); end != BreakIterator.DONE;
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start = end, end = iter.next())
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{
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if ((end - start) > (wordEnd - wordStart))
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{
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wordStart = start;
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wordEnd = end;
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}
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}
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if (wordEnd - wordStart > 0)
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{
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FontMetrics fm = getFontMetrics();
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int offset = s.offset + wordStart - s.getBeginIndex();
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span = fm.charsWidth(s.array, offset, wordEnd - wordStart);
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}
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}
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catch (BadLocationException ex)
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{
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// Return 0.
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}
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return span;
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}
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}
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