summaryrefslogtreecommitdiff
path: root/libjava/classpath/javax/swing/text/html/InlineView.java
diff options
context:
space:
mode:
Diffstat (limited to 'libjava/classpath/javax/swing/text/html/InlineView.java')
-rw-r--r--libjava/classpath/javax/swing/text/html/InlineView.java307
1 files changed, 307 insertions, 0 deletions
diff --git a/libjava/classpath/javax/swing/text/html/InlineView.java b/libjava/classpath/javax/swing/text/html/InlineView.java
new file mode 100644
index 000000000..5376c6b9d
--- /dev/null
+++ b/libjava/classpath/javax/swing/text/html/InlineView.java
@@ -0,0 +1,307 @@
+/* InlineView.java -- Renders HTML content
+ 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 java.awt.FontMetrics;
+import java.awt.Shape;
+import java.text.BreakIterator;
+
+import javax.swing.event.DocumentEvent;
+import javax.swing.text.AttributeSet;
+import javax.swing.text.BadLocationException;
+import javax.swing.text.Document;
+import javax.swing.text.Element;
+import javax.swing.text.LabelView;
+import javax.swing.text.Segment;
+import javax.swing.text.View;
+import javax.swing.text.ViewFactory;
+
+/**
+ * Renders HTML content (identified by {@link HTML.Tag#CONTENT}). This is
+ * basically a {@link LabelView} that is adjusted to understand styles defined
+ * by stylesheets.
+ *
+ * @author Roman Kennke (kennke@aicas.com)
+ */
+public class InlineView
+ extends LabelView
+{
+
+ /**
+ * The attributes used by this view.
+ */
+ private AttributeSet attributes;
+
+ /**
+ * The span of the longest word in this view.
+ *
+ * @see #getLongestWord()
+ */
+ private float longestWord;
+
+ /**
+ * Indicates if we may wrap or not.
+ */
+ private boolean nowrap;
+
+ /**
+ * Creates a new <code>InlineView</code> that renders the specified element.
+ *
+ * @param element the element for this view
+ */
+ public InlineView(Element element)
+ {
+ super(element);
+ }
+
+ /**
+ * Receives notification that something was inserted into the document in
+ * a location that this view is responsible for.
+ *
+ * @param e the document event
+ * @param a the current allocation of this view
+ * @param f the view factory for creating new views
+ *
+ * @since 1.5
+ */
+ public void insertUpdate(DocumentEvent e, Shape a, ViewFactory f)
+ {
+ // FIXME: What to do here?
+ super.insertUpdate(e, a, f);
+ }
+
+ /**
+ * Receives notification that something was removed from the document in
+ * a location that this view is responsible for.
+ *
+ * @param e the document event
+ * @param a the current allocation of this view
+ * @param f the view factory for creating new views
+ *
+ * @since 1.5
+ */
+ public void removeUpdate(DocumentEvent e, Shape a, ViewFactory f)
+ {
+ // FIXME: What to do here?
+ super.removeUpdate(e, a, f);
+ }
+
+ /**
+ * Receives notification that attributes have changed in the document in
+ * a location that this view is responsible for. This calls
+ * {@link #setPropertiesFromAttributes}.
+ *
+ * @param e the document event
+ * @param a the current allocation of this view
+ * @param f the view factory for creating new views
+ *
+ * @since 1.5
+ */
+ public void changedUpdate(DocumentEvent e, Shape a, ViewFactory f)
+ {
+ super.changedUpdate(e, a, f);
+ StyleSheet ss = getStyleSheet();
+ attributes = ss.getViewAttributes(this);
+ preferenceChanged(null, true, true);
+ setPropertiesFromAttributes();
+ }
+
+ /**
+ * Returns the attributes that are used for rendering. This is implemented
+ * to multiplex the attributes specified in the model with a stylesheet.
+ *
+ * @return the attributes that are used for rendering
+ */
+ public AttributeSet getAttributes()
+ {
+ if (attributes == null)
+ {
+ StyleSheet ss = getStyleSheet();
+ attributes = ss.getViewAttributes(this);
+ }
+ return attributes;
+ }
+
+
+ public int getBreakWeight(int axis, float pos, float len)
+ {
+ int weight;
+ if (nowrap)
+ weight = BadBreakWeight;
+ else
+ weight = super.getBreakWeight(axis, pos, len);
+ return weight;
+ }
+
+ public View breakView(int axis, int offset, float pos, float len)
+ {
+ // FIXME: Implement this.
+ return super.breakView(axis, offset, pos, len);
+ }
+
+ /**
+ * Loads the character style properties from the stylesheet.
+ */
+ protected void setPropertiesFromAttributes()
+ {
+ super.setPropertiesFromAttributes();
+ AttributeSet atts = getAttributes();
+ Object o = atts.getAttribute(CSS.Attribute.TEXT_DECORATION);
+
+ // Check for underline.
+ boolean b = false;
+ if (o != null && o.toString().contains("underline"))
+ b = true;
+ setUnderline(b);
+
+ // Check for line-through.
+ b = false;
+ if (o != null && o.toString().contains("line-through"))
+ b = true;
+ setStrikeThrough(b);
+
+ // Check for vertical alignment (subscript/superscript).
+ o = atts.getAttribute(CSS.Attribute.VERTICAL_ALIGN);
+
+ // Subscript.
+ b = false;
+ if (o != null && o.toString().contains("sub"))
+ b = true;
+ setSubscript(b);
+
+ // Superscript.
+ b = false;
+ if (o != null && o.toString().contains("sup"))
+ b = true;
+ setSuperscript(b);
+
+ // Fetch nowrap setting.
+ o = atts.getAttribute(CSS.Attribute.WHITE_SPACE);
+ if (o != null && o.equals("nowrap"))
+ nowrap = true;
+ else
+ nowrap = false;
+ }
+
+ /**
+ * Returns the stylesheet used by this view. This returns the stylesheet
+ * of the <code>HTMLDocument</code> that is rendered 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;
+ }
+
+ /**
+ * Returns the minimum span for the specified axis. This returns the
+ * width of the longest word for the X axis and the super behaviour for
+ * the Y axis. This is a slight deviation from the reference implementation.
+ * IMO this should improve rendering behaviour so that an InlineView never
+ * gets smaller than the longest word in it.
+ */
+ public float getMinimumSpan(int axis)
+ {
+ float min = super.getMinimumSpan(axis);
+ if (axis == X_AXIS)
+ min = Math.max(getLongestWord(), min);
+ return min;
+ }
+
+ /**
+ * Returns the span of the longest word in this view.
+ *
+ * @return the span of the longest word in this view
+ */
+ private float getLongestWord()
+ {
+ if (longestWord == -1)
+ longestWord = calculateLongestWord();
+ return longestWord;
+ }
+
+ /**
+ * Calculates the span of the longest word in this view.
+ *
+ * @return the span of the longest word in this view
+ */
+ private float calculateLongestWord()
+ {
+ float span = 0;
+ try
+ {
+ Document doc = getDocument();
+ int p0 = getStartOffset();
+ int p1 = getEndOffset();
+ Segment s = new Segment();
+ doc.getText(p0, p1 - p0, s);
+ BreakIterator iter = BreakIterator.getWordInstance();
+ iter.setText(s);
+ int wordStart = p0;
+ int wordEnd = p0;
+ int start = iter.first();
+ for (int end = iter.next(); end != BreakIterator.DONE;
+ start = end, end = iter.next())
+ {
+ if ((end - start) > (wordEnd - wordStart))
+ {
+ wordStart = start;
+ wordEnd = end;
+ }
+ }
+ if (wordEnd - wordStart > 0)
+ {
+ FontMetrics fm = getFontMetrics();
+ int offset = s.offset + wordStart - s.getBeginIndex();
+ span = fm.charsWidth(s.array, offset, wordEnd - wordStart);
+ }
+ }
+ catch (BadLocationException ex)
+ {
+ // Return 0.
+ }
+ return span;
+ }
+
+}