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+/* ParagraphView.java -- Renders a paragraph in HTML
+ Copyright (C) 2006 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING. If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library. Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package javax.swing.text.html;
+
+import gnu.javax.swing.text.html.css.Length;
+
+import java.awt.Graphics;
+import java.awt.Rectangle;
+import java.awt.Shape;
+
+import javax.swing.SizeRequirements;
+import javax.swing.text.AttributeSet;
+import javax.swing.text.Document;
+import javax.swing.text.Element;
+import javax.swing.text.StyleConstants;
+import javax.swing.text.View;
+
+/**
+ * Renders a paragraph in HTML. This is a subclass of
+ * {@link javax.swing.text.ParagraphView} with some adjustments for
+ * understanding stylesheets.
+ *
+ * @author Roman Kennke (kennke@aicas.com)
+ */
+public class ParagraphView
+ extends javax.swing.text.ParagraphView
+{
+
+ /**
+ * The attributes used by this view.
+ */
+ private AttributeSet attributes;
+
+ /**
+ * The stylesheet's box painter.
+ */
+ private StyleSheet.BoxPainter painter;
+
+ /**
+ * The width as specified in the stylesheet or null if not specified.
+ */
+ private Length cssWidth;
+
+ /**
+ * The height as specified in the stylesheet or null if not specified.
+ */
+ private Length cssHeight;
+
+ /**
+ * Creates a new ParagraphView for the specified element.
+ *
+ * @param element the element
+ */
+ public ParagraphView(Element element)
+ {
+ super(element);
+ }
+
+ /**
+ * Sets the parent of this view. This is implemented to call the parent
+ * functionality and then trigger {@link #setPropertiesFromAttributes} in
+ * order to load the stylesheet attributes.
+ *
+ * @param parent the parent view to set
+ */
+ public void setParent(View parent)
+ {
+ super.setParent(parent);
+ if (parent != null)
+ setPropertiesFromAttributes();
+ }
+
+ /**
+ * Returns the attributes used by this view. This is implemented to multiplex
+ * the attributes of the model with the attributes of the stylesheet.
+ */
+ public AttributeSet getAttributes()
+ {
+ if (attributes == null)
+ {
+ attributes = getStyleSheet().getViewAttributes(this);
+ }
+ return attributes;
+ }
+
+ /**
+ * Loads the visual properties of the ParagraphView from the element's
+ * attributes and the stylesheet of the HTML document.
+ */
+ protected void setPropertiesFromAttributes()
+ {
+ super.setPropertiesFromAttributes();
+
+ // Fetch CSS attributes.
+ attributes = getAttributes();
+ if (attributes != null)
+ {
+ super.setPropertiesFromAttributes();
+ Object o = attributes.getAttribute(CSS.Attribute.TEXT_ALIGN);
+ if (o != null)
+ {
+ String align = o.toString();
+ if (align.equals("left"))
+ setJustification(StyleConstants.ALIGN_LEFT);
+ else if (align.equals("right"))
+ setJustification(StyleConstants.ALIGN_RIGHT);
+ else if (align.equals("center"))
+ setJustification(StyleConstants.ALIGN_CENTER);
+ else if (align.equals("justify"))
+ setJustification(StyleConstants.ALIGN_JUSTIFIED);
+ }
+
+ // Fetch StyleSheet's box painter.
+ painter = getStyleSheet().getBoxPainter(attributes);
+ setInsets((short) painter.getInset(TOP, this),
+ (short) painter.getInset(LEFT, this),
+ (short) painter.getInset(BOTTOM, this),
+ (short) painter.getInset(RIGHT, this));
+
+ StyleSheet ss = getStyleSheet();
+ float emBase = ss.getEMBase(attributes);
+ float exBase = ss.getEXBase(attributes);
+ cssWidth = (Length) attributes.getAttribute(CSS.Attribute.WIDTH);
+ if (cssWidth != null)
+ cssWidth.setFontBases(emBase, exBase);
+ cssHeight = (Length) attributes.getAttribute(CSS.Attribute.WIDTH);
+ if (cssHeight != null)
+ cssHeight.setFontBases(emBase, exBase);
+ }
+ }
+
+ /**
+ * Returns the stylesheet used by this view.
+ *
+ * @return the stylesheet used by this view
+ */
+ protected StyleSheet getStyleSheet()
+ {
+ Document doc = getDocument();
+ StyleSheet styleSheet = null;
+ if (doc instanceof HTMLDocument)
+ styleSheet = ((HTMLDocument) doc).getStyleSheet();
+ return styleSheet;
+ }
+
+ /**
+ * Calculates the minor axis requirements of this view. This is implemented
+ * to return the super class'es requirements and modifies the minimumSpan
+ * slightly so that it is not smaller than the length of the longest word.
+ *
+ * @param axis the axis
+ * @param r the SizeRequirements object to be used as return parameter;
+ * if <code>null</code> a new one will be created
+ *
+ * @return the requirements along the minor layout axis
+ */
+ protected SizeRequirements calculateMinorAxisRequirements(int axis,
+ SizeRequirements r)
+ {
+ r = super.calculateMinorAxisRequirements(axis, r);
+ if (! setCSSSpan(r, axis))
+ {
+ int margin = axis == X_AXIS ? getLeftInset() + getRightInset()
+ : getTopInset() + getBottomInset();
+ r.minimum -= margin;
+ r.preferred -= margin;
+ r.maximum -= margin;
+ }
+ return r;
+ }
+
+ /**
+ * Sets the span on the SizeRequirements object according to the
+ * according CSS span value, when it is set.
+ *
+ * @param r the size requirements
+ * @param axis the axis
+ *
+ * @return <code>true</code> when the CSS span has been set,
+ * <code>false</code> otherwise
+ */
+ private boolean setCSSSpan(SizeRequirements r, int axis)
+ {
+ boolean ret = false;
+ if (axis == X_AXIS)
+ {
+ if (cssWidth != null && ! cssWidth.isPercentage())
+ {
+ r.minimum = (int) cssWidth.getValue();
+ r.preferred = (int) cssWidth.getValue();
+ r.maximum = (int) cssWidth.getValue();
+ ret = true;
+ }
+ }
+ else
+ {
+ if (cssHeight != null && ! cssWidth.isPercentage())
+ {
+ r.minimum = (int) cssHeight.getValue();
+ r.preferred = (int) cssHeight.getValue();
+ r.maximum = (int) cssHeight.getValue();
+ ret = true;
+ }
+ }
+ return ret;
+ }
+
+ /**
+ * Determines if this view is visible or not. If none of the children is
+ * visible and the only visible child is the break that ends the paragraph,
+ * this paragraph is not considered to be visible.
+ *
+ * @return the visibility of this paragraph
+ */
+ public boolean isVisible()
+ {
+ // FIXME: Implement the above specified behaviour.
+ return super.isVisible();
+ }
+
+ /**
+ * Paints this view. This paints the box using the stylesheet's
+ * box painter for this view and delegates to the super class paint()
+ * afterwards.
+ *
+ * @param g the graphics object
+ * @param a the current allocation of this view
+ */
+ public void paint(Graphics g, Shape a)
+ {
+ if (a != null)
+ {
+ Rectangle r = a instanceof Rectangle ? (Rectangle) a : a.getBounds();
+ painter.paint(g, r.x, r.y, r.width, r.height, this);
+ }
+ super.paint(g, a);
+ }
+
+ /**
+ * Returns the preferred span of this view. If this view is not visible,
+ * we return <code>0</code>, otherwise the super class is called.
+ *
+ * @param axis the axis
+ *
+ * @return the preferred span of this view
+ */
+ public float getPreferredSpan(int axis)
+ {
+ float span = 0;
+ if (isVisible())
+ span = super.getPreferredSpan(axis);
+ return span;
+ }
+
+ /**
+ * Returns the minimum span of this view. If this view is not visible,
+ * we return <code>0</code>, otherwise the super class is called.
+ *
+ * @param axis the axis
+ *
+ * @return the minimum span of this view
+ */
+ public float getMinimumSpan(int axis)
+ {
+ float span = 0;
+ if (isVisible())
+ span = super.getMinimumSpan(axis);
+ return span;
+ }
+
+ /**
+ * Returns the maximum span of this view. If this view is not visible,
+ * we return <code>0</code>, otherwise the super class is called.
+ *
+ * @param axis the axis
+ *
+ * @return the maximum span of this view
+ */
+ public float getMaximumSpan(int axis)
+ {
+ float span = 0;
+ if (isVisible())
+ span = super.getMaximumSpan(axis);
+ return span;
+ }
+}