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323 lines
9.6 KiB
Java
323 lines
9.6 KiB
Java
/* ParagraphView.java -- Renders a paragraph in HTML
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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 gnu.javax.swing.text.html.css.Length;
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import java.awt.Graphics;
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import java.awt.Rectangle;
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import java.awt.Shape;
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import javax.swing.SizeRequirements;
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import javax.swing.text.AttributeSet;
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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.StyleConstants;
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import javax.swing.text.View;
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/**
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* Renders a paragraph in HTML. This is a subclass of
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* {@link javax.swing.text.ParagraphView} with some adjustments for
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* understanding 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 ParagraphView
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extends javax.swing.text.ParagraphView
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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 stylesheet's box painter.
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*/
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private StyleSheet.BoxPainter painter;
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/**
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* The width as specified in the stylesheet or null if not specified.
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*/
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private Length cssWidth;
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/**
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* The height as specified in the stylesheet or null if not specified.
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*/
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private Length cssHeight;
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/**
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* Creates a new ParagraphView for the specified element.
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*
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* @param element the element
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*/
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public ParagraphView(Element element)
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{
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super(element);
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}
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/**
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* Sets the parent of this view. This is implemented to call the parent
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* functionality and then trigger {@link #setPropertiesFromAttributes} in
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* order to load the stylesheet attributes.
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*
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* @param parent the parent view to set
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*/
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public void setParent(View parent)
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{
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super.setParent(parent);
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if (parent != null)
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setPropertiesFromAttributes();
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}
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/**
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* Returns the attributes used by this view. This is implemented to multiplex
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* the attributes of the model with the attributes of the stylesheet.
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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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attributes = getStyleSheet().getViewAttributes(this);
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}
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return attributes;
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}
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/**
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* Loads the visual properties of the ParagraphView from the element's
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* attributes and the stylesheet of the HTML document.
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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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// Fetch CSS attributes.
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attributes = getAttributes();
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if (attributes != null)
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{
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super.setPropertiesFromAttributes();
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Object o = attributes.getAttribute(CSS.Attribute.TEXT_ALIGN);
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if (o != null)
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{
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String align = o.toString();
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if (align.equals("left"))
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setJustification(StyleConstants.ALIGN_LEFT);
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else if (align.equals("right"))
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setJustification(StyleConstants.ALIGN_RIGHT);
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else if (align.equals("center"))
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setJustification(StyleConstants.ALIGN_CENTER);
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else if (align.equals("justify"))
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setJustification(StyleConstants.ALIGN_JUSTIFIED);
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}
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// Fetch StyleSheet's box painter.
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painter = getStyleSheet().getBoxPainter(attributes);
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setInsets((short) painter.getInset(TOP, this),
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(short) painter.getInset(LEFT, this),
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(short) painter.getInset(BOTTOM, this),
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(short) painter.getInset(RIGHT, this));
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StyleSheet ss = getStyleSheet();
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float emBase = ss.getEMBase(attributes);
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float exBase = ss.getEXBase(attributes);
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cssWidth = (Length) attributes.getAttribute(CSS.Attribute.WIDTH);
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if (cssWidth != null)
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cssWidth.setFontBases(emBase, exBase);
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cssHeight = (Length) attributes.getAttribute(CSS.Attribute.WIDTH);
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if (cssHeight != null)
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cssHeight.setFontBases(emBase, exBase);
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}
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}
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/**
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* Returns the stylesheet used 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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* Calculates the minor axis requirements of this view. This is implemented
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* to return the super class'es requirements and modifies the minimumSpan
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* slightly so that it is not smaller than the length of the longest word.
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*
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* @param axis the axis
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* @param r the SizeRequirements object to be used as return parameter;
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* if <code>null</code> a new one will be created
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*
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* @return the requirements along the minor layout axis
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*/
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protected SizeRequirements calculateMinorAxisRequirements(int axis,
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SizeRequirements r)
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{
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r = super.calculateMinorAxisRequirements(axis, r);
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if (! setCSSSpan(r, axis))
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{
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int margin = axis == X_AXIS ? getLeftInset() + getRightInset()
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: getTopInset() + getBottomInset();
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r.minimum -= margin;
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r.preferred -= margin;
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r.maximum -= margin;
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}
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return r;
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}
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/**
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* Sets the span on the SizeRequirements object according to the
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* according CSS span value, when it is set.
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*
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* @param r the size requirements
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* @param axis the axis
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*
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* @return <code>true</code> when the CSS span has been set,
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* <code>false</code> otherwise
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*/
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private boolean setCSSSpan(SizeRequirements r, int axis)
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{
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boolean ret = false;
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if (axis == X_AXIS)
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{
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if (cssWidth != null && ! cssWidth.isPercentage())
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{
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r.minimum = (int) cssWidth.getValue();
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r.preferred = (int) cssWidth.getValue();
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r.maximum = (int) cssWidth.getValue();
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ret = true;
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}
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}
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else
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{
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if (cssHeight != null && ! cssWidth.isPercentage())
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{
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r.minimum = (int) cssHeight.getValue();
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r.preferred = (int) cssHeight.getValue();
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r.maximum = (int) cssHeight.getValue();
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ret = true;
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}
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}
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return ret;
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}
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/**
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* Determines if this view is visible or not. If none of the children is
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* visible and the only visible child is the break that ends the paragraph,
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* this paragraph is not considered to be visible.
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*
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* @return the visibility of this paragraph
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*/
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public boolean isVisible()
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{
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// FIXME: Implement the above specified behaviour.
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return super.isVisible();
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}
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/**
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* Paints this view. This paints the box using the stylesheet's
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* box painter for this view and delegates to the super class paint()
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* afterwards.
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*
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* @param g the graphics object
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* @param a the current allocation of this view
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*/
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public void paint(Graphics g, Shape a)
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{
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if (a != null)
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{
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Rectangle r = a instanceof Rectangle ? (Rectangle) a : a.getBounds();
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painter.paint(g, r.x, r.y, r.width, r.height, this);
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}
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super.paint(g, a);
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}
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/**
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* Returns the preferred span of this view. If this view is not visible,
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* we return <code>0</code>, otherwise the super class is called.
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*
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* @param axis the axis
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*
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* @return the preferred span of this view
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*/
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public float getPreferredSpan(int axis)
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{
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float span = 0;
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if (isVisible())
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span = super.getPreferredSpan(axis);
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return span;
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}
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/**
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* Returns the minimum span of this view. If this view is not visible,
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* we return <code>0</code>, otherwise the super class is called.
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*
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* @param axis the axis
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*
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* @return the minimum span of this view
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*/
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public float getMinimumSpan(int axis)
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{
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float span = 0;
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if (isVisible())
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span = super.getMinimumSpan(axis);
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return span;
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}
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/**
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* Returns the maximum span of this view. If this view is not visible,
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* we return <code>0</code>, otherwise the super class is called.
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*
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* @param axis the axis
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*
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* @return the maximum span of this view
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*/
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public float getMaximumSpan(int axis)
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{
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float span = 0;
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if (isVisible())
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span = super.getMaximumSpan(axis);
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return span;
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}
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}
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