/*
* @(#)AccessibleHTML.java 1.13 03/12/19
*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package javax.swing.text.html;
import java.awt.*;
import java.awt.event.*;
import java.beans.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;
import javax.accessibility.*;
import java.text.BreakIterator;
/*
* The AccessibleHTML class provide information about the contents
* of a HTML document to assistive technologies.
*
* @version 1.13 12/19/03
* @author Lynn Monsanto
*/
class AccessibleHTML implements Accessible {
/**
* The editor.
*/
private JEditorPane editor;
/**
* Current model.
*/
private Document model;
/**
* DocumentListener installed on the current model.
*/
private DocumentListener docListener;
/**
* PropertyChangeListener installed on the editor
*/
private PropertyChangeListener propChangeListener;
/**
* The root ElementInfo for the document
*/
private ElementInfo rootElementInfo;
/*
* The root accessible context for the document
*/
private RootHTMLAccessibleContext rootHTMLAccessibleContext;
public AccessibleHTML(JEditorPane pane) {
editor = pane;
propChangeListener = new PropertyChangeHandler();
setDocument(editor.getDocument());
docListener = new DocumentHandler();
}
/**
* Sets the document.
*/
private void setDocument(Document document) {
if (model != null) {
model.removeDocumentListener(docListener);
}
if (editor != null) {
editor.removePropertyChangeListener(propChangeListener);
}
this.model = document;
if (model != null) {
if (rootElementInfo != null) {
rootElementInfo.invalidate(false);
}
buildInfo();
model.addDocumentListener(docListener);
}
else {
rootElementInfo = null;
}
if (editor != null) {
editor.addPropertyChangeListener(propChangeListener);
}
}
/**
* Returns the Document currently presenting information for.
*/
private Document getDocument() {
return model;
}
/**
* Returns the JEditorPane providing information for.
*/
private JEditorPane getTextComponent() {
return editor;
}
/**
* Returns the ElementInfo representing the root Element.
*/
private ElementInfo getRootInfo() {
return rootElementInfo;
}
/**
* Returns the root <code>View</code> associated with the current text
* component.
*/
private View getRootView() {
return getTextComponent().getUI().getRootView(getTextComponent());
}
/**
* Returns the bounds the root View will be rendered in.
*/
private Rectangle getRootEditorRect() {
Rectangle alloc = getTextComponent().getBounds();
if ((alloc.width > 0) && (alloc.height > 0)) {
alloc.x = alloc.y = 0;
Insets insets = editor.getInsets();
alloc.x += insets.left;
alloc.y += insets.top;
alloc.width -= insets.left + insets.right;
alloc.height -= insets.top + insets.bottom;
return alloc;
}
return null;
}
/**
* If possible acquires a lock on the Document. If a lock has been
* obtained a key will be retured that should be passed to
* <code>unlock</code>.
*/
private Object lock() {
Document document = getDocument();
if (document instanceof AbstractDocument) {
((AbstractDocument)document).readLock();
return document;
}
return null;
}
/**
* Releases a lock previously obtained via <code>lock</code>.
*/
private void unlock(Object key) {
if (key != null) {
((AbstractDocument)key).readUnlock();
}
}
/**
* Rebuilds the information from the current info.
*/
private void buildInfo() {
Object lock = lock();
try {
Document doc = getDocument();
Element root = doc.getDefaultRootElement();
rootElementInfo = new ElementInfo(root);
rootElementInfo.validate();
} finally {
unlock(lock);
}
}
/*
* Create an ElementInfo subclass based on the passed in Element.
*/
ElementInfo createElementInfo(Element e, ElementInfo parent) {
AttributeSet attrs = e.getAttributes();
if (attrs != null) {
Object name = attrs.getAttribute(StyleConstants.NameAttribute);
if (name == HTML.Tag.IMG) {
return new IconElementInfo(e, parent);
}
else if (name == HTML.Tag.CONTENT || name == HTML.Tag.CAPTION) {
return new TextElementInfo(e, parent);
}
else if (name == HTML.Tag.TABLE) {
return new TableElementInfo(e, parent);
}
}
return null;
}
/**
* Returns the root AccessibleContext for the document
*/
public AccessibleContext getAccessibleContext() {
if (rootHTMLAccessibleContext == null) {
rootHTMLAccessibleContext =
new RootHTMLAccessibleContext(rootElementInfo);
}
return rootHTMLAccessibleContext;
}
/*
* The roow AccessibleContext for the document
*/
private class RootHTMLAccessibleContext extends HTMLAccessibleContext {
public RootHTMLAccessibleContext(ElementInfo elementInfo) {
super(elementInfo);
}
/**
* Gets the accessibleName property of this object. The accessibleName
* property of an object is a localized String that designates the purpose
* of the object. For example, the accessibleName property of a label
* or button might be the text of the label or button itself. In the
* case of an object that doesn't display its name, the accessibleName
* should still be set. For example, in the case of a text field used
* to enter the name of a city, the accessibleName for the en_US locale
* could be 'city.'
*
* @return the localized name of the object; null if this
* object does not have a name
*
* @see #setAccessibleName
*/
public String getAccessibleName() {
if (model != null) {
return (String)model.getProperty(Document.TitleProperty);
} else {
return null;
}
}
/**
* Gets the accessibleDescription property of this object. If this
* property isn't set, returns the content type of this
* <code>JEditorPane</code> instead (e.g. "plain/text", "html/text").
*
* @return the localized description of the object; <code>null</code>
* if this object does not have a description
*
* @see #setAccessibleName
*/
public String getAccessibleDescription() {
return editor.getContentType();
}
/**
* Gets the role of this object. The role of the object is the generic
* purpose or use of the class of this object. For example, the role
* of a push button is AccessibleRole.PUSH_BUTTON. The roles in
* AccessibleRole are provided so component developers can pick from
* a set of predefined roles. This enables assistive technologies to
* provide a consistent interface to various tweaked subclasses of
* components (e.g., use AccessibleRole.PUSH_BUTTON for all components
* that act like a push button) as well as distinguish between sublasses
* that behave differently (e.g., AccessibleRole.CHECK_BOX for check boxes
* and AccessibleRole.RADIO_BUTTON for radio buttons).
* <p>Note that the AccessibleRole class is also extensible, so
* custom component developers can define their own AccessibleRole's
* if the set of predefined roles is inadequate.
*
* @return an instance of AccessibleRole describing the role of the object
* @see AccessibleRole
*/
public AccessibleRole getAccessibleRole() {
return AccessibleRole.TEXT;
}
}
/*
* Base AccessibleContext class for HTML elements
*/
protected abstract class HTMLAccessibleContext extends AccessibleContext
implements Accessible, AccessibleComponent {
protected ElementInfo elementInfo;
public HTMLAccessibleContext(ElementInfo elementInfo) {
this.elementInfo = elementInfo;
}
// begin AccessibleContext implementation ...
public AccessibleContext getAccessibleContext() {
return this;
}
/**
* Gets the state set of this object.
*
* @return an instance of AccessibleStateSet describing the states
* of the object
* @see AccessibleStateSet
*/
public AccessibleStateSet getAccessibleStateSet() {
AccessibleStateSet states = new AccessibleStateSet();
Component comp = getTextComponent();
if (comp.isEnabled()) {
states.add(AccessibleState.ENABLED);
}
if (comp instanceof JTextComponent &&
((JTextComponent)comp).isEditable()) {
states.add(AccessibleState.EDITABLE);
states.add(AccessibleState.FOCUSABLE);
}
if (comp.isVisible()) {
states.add(AccessibleState.VISIBLE);
}
if (comp.isShowing()) {
states.add(AccessibleState.SHOWING);
}
return states;
}
/**
* Gets the 0-based index of this object in its accessible parent.
*
* @return the 0-based index of this object in its parent; -1 if this
* object does not have an accessible parent.
*
* @see #getAccessibleParent
* @see #getAccessibleChildrenCount
* @see #getAccessibleChild
*/
public int getAccessibleIndexInParent() {
return elementInfo.getIndexInParent();
}
/**
* Returns the number of accessible children of the object.
*
* @return the number of accessible children of the object.
*/
public int getAccessibleChildrenCount() {
return elementInfo.getChildCount();
}
/**
* Returns the specified Accessible child of the object. The Accessible
* children of an Accessible object are zero-based, so the first child
* of an Accessible child is at index 0, the second child is at index 1,
* and so on.
*
* @param i zero-based index of child
* @return the Accessible child of the object
* @see #getAccessibleChildrenCount
*/
public Accessible getAccessibleChild(int i) {
ElementInfo childInfo = elementInfo.getChild(i);
if (childInfo != null && childInfo instanceof Accessible) {
return (Accessible)childInfo;
} else {
return null;
}
}
/**
* Gets the locale of the component. If the component does not have a
* locale, then the locale of its parent is returned.
*
* @return this component's locale. If this component does not have
* a locale, the locale of its parent is returned.
*
* @exception IllegalComponentStateException
* If the Component does not have its own locale and has not yet been
* added to a containment hierarchy such that the locale can be
* determined from the containing parent.
*/
public Locale getLocale() throws IllegalComponentStateException {
return editor.getLocale();
}
// ... end AccessibleContext implementation
// begin AccessibleComponent implementation ...
public AccessibleComponent getAccessibleComponent() {
return this;
}
/**
* Gets the background color of this object.
*
* @return the background color, if supported, of the object;
* otherwise, null
* @see #setBackground
*/
public Color getBackground() {
return getTextComponent().getBackground();
}
/**
* Sets the background color of this object.
*
* @param c the new Color for the background
* @see #setBackground
*/
public void setBackground(Color c) {
getTextComponent().setBackground(c);
}
/**
* Gets the foreground color of this object.
*
* @return the foreground color, if supported, of the object;
* otherwise, null
* @see #setForeground
*/
public Color getForeground() {
return getTextComponent().getForeground();
}
/**
* Sets the foreground color of this object.
*
* @param c the new Color for the foreground
* @see #getForeground
*/
public void setForeground(Color c) {
getTextComponent().setForeground(c);
}
/**
* Gets the Cursor of this object.
*
* @return the Cursor, if supported, of the object; otherwise, null
* @see #setCursor
*/
public Cursor getCursor() {
return getTextComponent().getCursor();
}
/**
* Sets the Cursor of this object.
*
* @param c the new Cursor for the object
* @see #getCursor
*/
public void setCursor(Cursor cursor) {
getTextComponent().setCursor(cursor);
}
/**
* Gets the Font of this object.
*
* @return the Font,if supported, for the object; otherwise, null
* @see #setFont
*/
public Font getFont() {
return getTextComponent().getFont();
}
/**
* Sets the Font of this object.
*
* @param f the new Font for the object
* @see #getFont
*/
public void setFont(Font f) {
getTextComponent().setFont(f);
}
/**
* Gets the FontMetrics of this object.
*
* @param f the Font
* @return the FontMetrics, if supported, the object; otherwise, null
* @see #getFont
*/
public FontMetrics getFontMetrics(Font f) {
return getTextComponent().getFontMetrics(f);
}
/**
* Determines if the object is enabled. Objects that are enabled
* will also have the AccessibleState.ENABLED state set in their
* AccessibleStateSets.
*
* @return true if object is enabled; otherwise, false
* @see #setEnabled
* @see AccessibleContext#getAccessibleStateSet
* @see AccessibleState#ENABLED
* @see AccessibleStateSet
*/
public boolean isEnabled() {
return getTextComponent().isEnabled();
}
/**
* Sets the enabled state of the object.
*
* @param b if true, enables this object; otherwise, disables it
* @see #isEnabled
*/
public void setEnabled(boolean b) {
getTextComponent().setEnabled(b);
}
/**
* Determines if the object is visible. Note: this means that the
* object intends to be visible; however, it may not be
* showing on the screen because one of the objects that this object
* is contained by is currently not visible. To determine if an object
* is showing on the screen, use isShowing().
* <p>Objects that are visible will also have the
* AccessibleState.VISIBLE state set in their AccessibleStateSets.
*
* @return true if object is visible; otherwise, false
* @see #setVisible
* @see AccessibleContext#getAccessibleStateSet
* @see AccessibleState#VISIBLE
* @see AccessibleStateSet
*/
public boolean isVisible() {
return getTextComponent().isVisible();
}
/**
* Sets the visible state of the object.
*
* @param b if true, shows this object; otherwise, hides it
* @see #isVisible
*/
public void setVisible(boolean b) {
getTextComponent().setVisible(b);
}
/**
* Determines if the object is showing. This is determined by checking
* the visibility of the object and its ancestors.
* Note: this
* will return true even if the object is obscured by another (for
* example, it is underneath a menu that was pulled down).
*
* @return true if object is showing; otherwise, false
*/
public boolean isShowing() {
return getTextComponent().isShowing();
}
/**
* Checks whether the specified point is within this object's bounds,
* where the point's x and y coordinates are defined to be relative
* to the coordinate system of the object.
*
* @param p the Point relative to the coordinate system of the object
* @return true if object contains Point; otherwise false
* @see #getBounds
*/
public boolean contains(Point p) {
Rectangle r = getBounds();
if (r != null) {
return r.contains(p.x, p.y);
} else {
return false;
}
}
/**
* Returns the location of the object on the screen.
*
* @return the location of the object on screen; null if this object
* is not on the screen
* @see #getBounds
* @see #getLocation
*/
public Point getLocationOnScreen() {
Point editorLocation = getTextComponent().getLocationOnScreen();
Rectangle r = getBounds();
if (r != null) {
return new Point(editorLocation.x + r.x,
editorLocation.y + r.y);
} else {
return null;
}
}
/**
* Gets the location of the object relative to the parent in the form
* of a point specifying the object's top-left corner in the screen's
* coordinate space.
*
* @return An instance of Point representing the top-left corner of the
* object's bounds in the coordinate space of the screen; null if
* this object or its parent are not on the screen
* @see #getBounds
* @see #getLocationOnScreen
*/
public Point getLocation() {
Rectangle r = getBounds();
if (r != null) {
return new Point(r.x, r.y);
} else {
return null;
}
}
/**
* Sets the location of the object relative to the parent.
* @param p the new position for the top-left corner
* @see #getLocation
*/
public void setLocation(Point p) {
}
/**
* Gets the bounds of this object in the form of a Rectangle object.
* The bounds specify this object's width, height, and location
* relative to its parent.
*
* @return A rectangle indicating this component's bounds; null if
* this object is not on the screen.
* @see #contains
*/
public Rectangle getBounds() {
return elementInfo.getBounds();
}
/**
* Sets the bounds of this object in the form of a Rectangle object.
* The bounds specify this object's width, height, and location
* relative to its parent.
*
* @param r rectangle indicating this component's bounds
* @see #getBounds
*/
public void setBounds(Rectangle r) {
}
/**
* Returns the size of this object in the form of a Dimension object.
* The height field of the Dimension object contains this object's
* height, and the width field of the Dimension object contains this
* object's width.
*
* @return A Dimension object that indicates the size of this component;
* null if this object is not on the screen
* @see #setSize
*/
public Dimension getSize() {
Rectangle r = getBounds();
if (r != null) {
return new Dimension(r.width, r.height);
} else {
return null;
}
}
/**
* Resizes this object so that it has width and height.
*
* @param d The dimension specifying the new size of the object.
* @see #getSize
*/
public void setSize(Dimension d) {
Component comp = getTextComponent();
comp.setSize(d);
}
/**
* Returns the Accessible child, if one exists, contained at the local
* coordinate Point.
*
* @param p The point relative to the coordinate system of this object.
* @return the Accessible, if it exists, at the specified location;
* otherwise null
*/
public Accessible getAccessibleAt(Point p) {
ElementInfo innerMostElement = getElementInfoAt(rootElementInfo, p);
if (innerMostElement instanceof Accessible) {
return (Accessible)innerMostElement;
} else {
return null;
}
}
private ElementInfo getElementInfoAt(ElementInfo elementInfo, Point p) {
if (elementInfo.getBounds() == null) {
return null;
}
if (elementInfo.getChildCount() == 0 &&
elementInfo.getBounds().contains(p)) {
return elementInfo;
} else {
if (elementInfo instanceof TableElementInfo) {
// Handle table caption as a special case since it's the
// only table child that is not a table row.
ElementInfo captionInfo =
((TableElementInfo)elementInfo).getCaptionInfo();
if (captionInfo != null) {
Rectangle bounds = captionInfo.getBounds();
if (bounds != null && bounds.contains(p)) {
return captionInfo;
}
}
}
for (int i = 0; i < elementInfo.getChildCount(); i++)
{
ElementInfo childInfo = elementInfo.getChild(i);
ElementInfo retValue = getElementInfoAt(childInfo, p);
if (retValue != null) {
return retValue;
}
}
}
return null;
}
/**
* Returns whether this object can accept focus or not. Objects that
* can accept focus will also have the AccessibleState.FOCUSABLE state
* set in their AccessibleStateSets.
*
* @return true if object can accept focus; otherwise false
* @see AccessibleContext#getAccessibleStateSet
* @see AccessibleState#FOCUSABLE
* @see AccessibleState#FOCUSED
* @see AccessibleStateSet
*/
public boolean isFocusTraversable() {
Component comp = getTextComponent();
if (comp instanceof JTextComponent) {
if (((JTextComponent)comp).isEditable()) {
return true;
}
}
return false;
}
/**
* Requests focus for this object. If this object cannot accept focus,
* nothing will happen. Otherwise, the object will attempt to take
* focus.
* @see #isFocusTraversable
*/
public void requestFocus() {
// TIGER - 4856191
if (! isFocusTraversable()) {
return;
}
Component comp = getTextComponent();
if (comp instanceof JTextComponent) {
comp.requestFocusInWindow();
try {
if (elementInfo.validateIfNecessary()) {
// set the caret position to the start of this component
Element elem = elementInfo.getElement();
((JTextComponent)comp).setCaretPosition(elem.getStartOffset());
// fire a AccessibleState.FOCUSED property change event
AccessibleContext ac = editor.getAccessibleContext();
PropertyChangeEvent pce = new PropertyChangeEvent(this,
AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
null, AccessibleState.FOCUSED);
ac.firePropertyChange(
AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
null, pce);
}
} catch (IllegalArgumentException e) {
// don't fire property change event
}
}
}
/**
* Adds the specified focus listener to receive focus events from this
* component.
*
* @param l the focus listener
* @see #removeFocusListener
*/
public void addFocusListener(FocusListener l) {
getTextComponent().addFocusListener(l);
}
/**
* Removes the specified focus listener so it no longer receives focus
* events from this component.
*
* @param l the focus listener
* @see #addFocusListener
*/
public void removeFocusListener(FocusListener l) {
getTextComponent().removeFocusListener(l);
}
// ... end AccessibleComponent implementation
} // ... end HTMLAccessibleContext
/*
* ElementInfo for text
*/
class TextElementInfo extends ElementInfo implements Accessible {
TextElementInfo(Element element, ElementInfo parent) {
super(element, parent);
}
// begin AccessibleText implementation ...
private AccessibleContext accessibleContext;
public AccessibleContext getAccessibleContext() {
if (accessibleContext == null) {
accessibleContext = new TextAccessibleContext(this);
}
return accessibleContext;
}
/*
* AccessibleContext for text elements
*/
public class TextAccessibleContext extends HTMLAccessibleContext
implements AccessibleText {
public TextAccessibleContext(ElementInfo elementInfo) {
super(elementInfo);
}
public AccessibleText getAccessibleText() {
return this;
}
/**
* Gets the accessibleName property of this object. The accessibleName
* property of an object is a localized String that designates the purpose
* of the object. For example, the accessibleName property of a label
* or button might be the text of the label or button itself. In the
* case of an object that doesn't display its name, the accessibleName
* should still be set. For example, in the case of a text field used
* to enter the name of a city, the accessibleName for the en_US locale
* could be 'city.'
*
* @return the localized name of the object; null if this
* object does not have a name
*
* @see #setAccessibleName
*/
public String getAccessibleName() {
if (model != null) {
return (String)model.getProperty(Document.TitleProperty);
} else {
return null;
}
}
/**
* Gets the accessibleDescription property of this object. If this
* property isn't set, returns the content type of this
* <code>JEditorPane</code> instead (e.g. "plain/text", "html/text").
*
* @return the localized description of the object; <code>null</code>
* if this object does not have a description
*
* @see #setAccessibleName
*/
public String getAccessibleDescription() {
return editor.getContentType();
}
/**
* Gets the role of this object. The role of the object is the generic
* purpose or use of the class of this object. For example, the role
* of a push button is AccessibleRole.PUSH_BUTTON. The roles in
* AccessibleRole are provided so component developers can pick from
* a set of predefined roles. This enables assistive technologies to
* provide a consistent interface to various tweaked subclasses of
* components (e.g., use AccessibleRole.PUSH_BUTTON for all components
* that act like a push button) as well as distinguish between sublasses
* that behave differently (e.g., AccessibleRole.CHECK_BOX for check boxes
* and AccessibleRole.RADIO_BUTTON for radio buttons).
* <p>Note that the AccessibleRole class is also extensible, so
* custom component developers can define their own AccessibleRole's
* if the set of predefined roles is inadequate.
*
* @return an instance of AccessibleRole describing the role of the object
* @see AccessibleRole
*/
public AccessibleRole getAccessibleRole() {
return AccessibleRole.TEXT;
}
/**
* Given a point in local coordinates, return the zero-based index
* of the character under that Point. If the point is invalid,
* this method returns -1.
*
* @param p the Point in local coordinates
* @return the zero-based index of the character under Point p; if
* Point is invalid returns -1.
*/
public int getIndexAtPoint(Point p) {
View v = getView();
if (v != null) {
return v.viewToModel(p.x, p.y, getBounds());
} else {
return -1;
}
}
/**
* Determine the bounding box of the character at the given
* index into the string. The bounds are returned in local
* coordinates. If the index is invalid an empty rectangle is
* returned.
*
* @param i the index into the String
* @return the screen coordinates of the character's the bounding box,
* if index is invalid returns an empty rectangle.
*/
public Rectangle getCharacterBounds(int i) {
try {
return editor.getUI().modelToView(editor, i);
} catch (BadLocationException e) {
return null;
}
}
/**
* Return the number of characters (valid indicies)
*
* @return the number of characters
*/
public int getCharCount() {
if (validateIfNecessary()) {
Element elem = elementInfo.getElement();
return elem.getEndOffset() - elem.getStartOffset();
}
return 0;
}
/**
* Return the zero-based offset of the caret.
*
* Note: That to the right of the caret will have the same index
* value as the offset (the caret is between two characters).
* @return the zero-based offset of the caret.
*/
public int getCaretPosition() {
View v = getView();
if (v == null) {
return -1;
}
Container c = v.getContainer();
if (c == null) {
return -1;
}
if (c instanceof JTextComponent) {
return ((JTextComponent)c).getCaretPosition();
} else {
return -1;
}
}
/**
* IndexedSegment extends Segment adding the offset into the
* the model the <code>Segment</code> was asked for.
*/
private class IndexedSegment extends Segment {
/**
* Offset into the model that the position represents.
*/
public int modelOffset;
}
public String getAtIndex(int part, int index) {
return getAtIndex(part, index, 0);
}
public String getAfterIndex(int part, int index) {
return getAtIndex(part, index, 1);
}
public String getBeforeIndex(int part, int index) {
return getAtIndex(part, index, -1);
}
/**
* Gets the word, sentence, or character at <code>index</code>.
* If <code>direction</code> is non-null this will find the
* next/previous word/sentence/character.
*/
private String getAtIndex(int part, int index, int direction) {
if (model instanceof AbstractDocument) {
((AbstractDocument)model).readLock();
}
try {
if (index < 0 || index >= model.getLength()) {
return null;
}
switch (part) {
case AccessibleText.CHARACTER:
if (index + direction < model.getLength() &&
index + direction >= 0) {
return model.getText(index + direction, 1);
}
break;
case AccessibleText.WORD:
case AccessibleText.SENTENCE:
IndexedSegment seg = getSegmentAt(part, index);
if (seg != null) {
if (direction != 0) {
int next;
if (direction < 0) {
next = seg.modelOffset - 1;
}
else {
next = seg.modelOffset + direction * seg.count;
}
if (next >= 0 && next <= model.getLength()) {
seg = getSegmentAt(part, next);
}
else {
seg = null;
}
}
if (seg != null) {
return new String(seg.array, seg.offset,
seg.count);
}
}
break;
default:
break;
}
} catch (BadLocationException e) {
} finally {
if (model instanceof AbstractDocument) {
((AbstractDocument)model).readUnlock();
}
}
return null;
}
/*
* Returns the paragraph element for the specified index.
*/
private Element getParagraphElement(int index) {
if (model instanceof PlainDocument ) {
PlainDocument sdoc = (PlainDocument)model;
return sdoc.getParagraphElement(index);
} else if (model instanceof StyledDocument) {
StyledDocument sdoc = (StyledDocument)model;
return sdoc.getParagraphElement(index);
} else {
Element para = null;
for (para = model.getDefaultRootElement(); ! para.isLeaf(); ) {
int pos = para.getElementIndex(index);
para = para.getElement(pos);
}
if (para == null) {
return null;
}
return para.getParentElement();
}
}
/*
* Returns a <code>Segment</code> containing the paragraph text
* at <code>index</code>, or null if <code>index</code> isn't
* valid.
*/
private IndexedSegment getParagraphElementText(int index)
throws BadLocationException {
Element para = getParagraphElement(index);
if (para != null) {
IndexedSegment segment = new IndexedSegment();
try {
int length = para.getEndOffset() - para.getStartOffset();
model.getText(para.getStartOffset(), length, segment);
} catch (BadLocationException e) {
return null;
}
segment.modelOffset = para.getStartOffset();
return segment;
}
return null;
}
/**
* Returns the Segment at <code>index</code> representing either
* the paragraph or sentence as identified by <code>part</code>, or
* null if a valid paragraph/sentence can't be found. The offset
* will point to the start of the word/sentence in the array, and
* the modelOffset will point to the location of the word/sentence
* in the model.
*/
private IndexedSegment getSegmentAt(int part, int index)
throws BadLocationException {
IndexedSegment seg = getParagraphElementText(index);
if (seg == null) {
return null;
}
BreakIterator iterator;
switch (part) {
case AccessibleText.WORD:
iterator = BreakIterator.getWordInstance(getLocale());
break;
case AccessibleText.SENTENCE:
iterator = BreakIterator.getSentenceInstance(getLocale());
break;
default:
return null;
}
seg.first();
iterator.setText(seg);
int end = iterator.following(index - seg.modelOffset + seg.offset);
if (end == BreakIterator.DONE) {
return null;
}
if (end > seg.offset + seg.count) {
return null;
}
int begin = iterator.previous();
if (begin == BreakIterator.DONE ||
begin >= seg.offset + seg.count) {
return null;
}
seg.modelOffset = seg.modelOffset + begin - seg.offset;
seg.offset = begin;
seg.count = end - begin;
return seg;
}
/**
* Return the AttributeSet for a given character at a given index
*
* @param i the zero-based index into the text
* @return the AttributeSet of the character
*/
public AttributeSet getCharacterAttribute(int i) {
if (model instanceof StyledDocument) {
StyledDocument doc = (StyledDocument)model;
Element elem = doc.getCharacterElement(i);
if (elem != null) {
return elem.getAttributes();
}
}
return null;
}
/**
* Returns the start offset within the selected text.
* If there is no selection, but there is
* a caret, the start and end offsets will be the same.
*
* @return the index into the text of the start of the selection
*/
public int getSelectionStart() {
return editor.getSelectionStart();
}
/**
* Returns the end offset within the selected text.
* If there is no selection, but there is
* a caret, the start and end offsets will be the same.
*
* @return the index into teh text of the end of the selection
*/
public int getSelectionEnd() {
return editor.getSelectionEnd();
}
/**
* Returns the portion of the text that is selected.
*
* @return the String portion of the text that is selected
*/
public String getSelectedText() {
return editor.getSelectedText();
}
/*
* Returns the text substring starting at the specified
* offset with the specified length.
*/
private String getText(int offset, int length)
throws BadLocationException {
if (model != null && model instanceof StyledDocument) {
StyledDocument doc = (StyledDocument)model;
return model.getText(offset, length);
} else {
return null;
}
}
}
}
/*
* ElementInfo for images
*/
private class IconElementInfo extends ElementInfo implements Accessible {
private int width = -1;
private int height = -1;
IconElementInfo(Element element, ElementInfo parent) {
super(element, parent);
}
protected void invalidate(boolean first) {
super.invalidate(first);
width = height = -1;
}
private int getImageSize(Object key) {
if (validateIfNecessary()) {
int size = getIntAttr(getAttributes(), key, -1);
if (size == -1) {
View v = getView();
size = 0;
if (v instanceof ImageView) {
Image img = ((ImageView)v).getImage();
if (img != null) {
if (key == HTML.Attribute.WIDTH) {
size = img.getWidth(null);
}
else {
size = img.getHeight(null);
}
}
}
}
return size;
}
return 0;
}
// begin AccessibleIcon implementation ...
private AccessibleContext accessibleContext;
public AccessibleContext getAccessibleContext() {
if (accessibleContext == null) {
accessibleContext = new IconAccessibleContext(this);
}
return accessibleContext;
}
/*
* AccessibleContext for images
*/
protected class IconAccessibleContext extends HTMLAccessibleContext
implements AccessibleIcon {
public IconAccessibleContext(ElementInfo elementInfo) {
super(elementInfo);
}
/**
* Gets the accessibleName property of this object. The accessibleName
* property of an object is a localized String that designates the purpose
* of the object. For example, the accessibleName property of a label
* or button might be the text of the label or button itself. In the
* case of an object that doesn't display its name, the accessibleName
* should still be set. For example, in the case of a text field used
* to enter the name of a city, the accessibleName for the en_US locale
* could be 'city.'
*
* @return the localized name of the object; null if this
* object does not have a name
*
* @see #setAccessibleName
*/
public String getAccessibleName() {
return getAccessibleIconDescription();
}
/**
* Gets the accessibleDescription property of this object. If this
* property isn't set, returns the content type of this
* <code>JEditorPane</code> instead (e.g. "plain/text", "html/text").
*
* @return the localized description of the object; <code>null</code>
* if this object does not have a description
*
* @see #setAccessibleName
*/
public String getAccessibleDescription() {
return editor.getContentType();
}
/**
* Gets the role of this object. The role of the object is the generic
* purpose or use of the class of this object. For example, the role
* of a push button is AccessibleRole.PUSH_BUTTON. The roles in
* AccessibleRole are provided so component developers can pick from
* a set of predefined roles. This enables assistive technologies to
* provide a consistent interface to various tweaked subclasses of
* components (e.g., use AccessibleRole.PUSH_BUTTON for all components
* that act like a push button) as well as distinguish between sublasses
* that behave differently (e.g., AccessibleRole.CHECK_BOX for check boxes
* and AccessibleRole.RADIO_BUTTON for radio buttons).
* <p>Note that the AccessibleRole class is also extensible, so
* custom component developers can define their own AccessibleRole's
* if the set of predefined roles is inadequate.
*
* @return an instance of AccessibleRole describing the role of the object
* @see AccessibleRole
*/
public AccessibleRole getAccessibleRole() {
return AccessibleRole.ICON;
}
public AccessibleIcon [] getAccessibleIcon() {
AccessibleIcon [] icons = new AccessibleIcon[1];
icons[0] = this;
return icons;
}
/**
* Gets the description of the icon. This is meant to be a brief
* textual description of the object. For example, it might be
* presented to a blind user to give an indication of the purpose
* of the icon.
*
* @return the description of the icon
*/
public String getAccessibleIconDescription() {
return ((ImageView)getView()).getAltText();
}
/**
* Sets the description of the icon. This is meant to be a brief
* textual description of the object. For example, it might be
* presented to a blind user to give an indication of the purpose
* of the icon.
*
* @param description the description of the icon
*/
public void setAccessibleIconDescription(String description) {
}
/**
* Gets the width of the icon
*
* @return the width of the icon.
*/
public int getAccessibleIconWidth() {
if (width == -1) {
width = getImageSize(HTML.Attribute.WIDTH);
}
return width;
}
/**
* Gets the height of the icon
*
* @return the height of the icon.
*/
public int getAccessibleIconHeight() {
if (height == -1) {
height = getImageSize(HTML.Attribute.HEIGHT);
}
return height;
}
}
// ... end AccessibleIconImplementation
}
/**
* TableElementInfo encapsulates information about a HTML.Tag.TABLE.
* To make access fast it crates a grid containing the children to
* allow for access by row, column. TableElementInfo will contain
* TableRowElementInfos, which will contain TableCellElementInfos.
* Any time one of the rows or columns becomes invalid the table is
* invalidated. This is because any time one of the child attributes
* changes the size of the grid may have changed.
*/
private class TableElementInfo extends ElementInfo
implements Accessible {
protected ElementInfo caption;
/**
* Allocation of the table by row x column. There may be holes (eg
* nulls) depending upon the html, any cell that has a rowspan/colspan
* > 1 will be contained multiple times in the grid.
*/
private TableCellElementInfo[][] grid;
TableElementInfo(Element e, ElementInfo parent) {
super(e, parent);
}
public ElementInfo getCaptionInfo() {
return caption;
}
/**
* Overriden to update the grid when validating.
*/
protected void validate() {
super.validate();
updateGrid();
}
/**
* Overriden to only alloc instances of TableRowElementInfos.
*/
protected void loadChildren(Element e) {
for (int counter = 0; counter < e.getElementCount(); counter++) {
Element child = e.getElement(counter);
AttributeSet attrs = child.getAttributes();
if (attrs.getAttribute(StyleConstants.NameAttribute) ==
HTML.Tag.TR) {
addChild(new TableRowElementInfo(child, this, counter));
} else if (attrs.getAttribute(StyleConstants.NameAttribute) ==
HTML.Tag.CAPTION) {
// Handle captions as a special case since all other
// children are table rows.
caption = createElementInfo(child, this);
}
}
}
/**
* Updates the grid.
*/
private void updateGrid() {
// Determine the max row/col count.
int delta = 0;
int maxCols = 0;
int rows = 0;
for (int counter = 0; counter < getChildCount(); counter++) {
TableRowElementInfo row = getRow(counter);
int prev = 0;
for (int y = 0; y < delta; y++) {
prev = Math.max(prev, getRow(counter - y - 1).
getColumnCount(y + 2));
}
delta = Math.max(row.getRowCount(), delta);
delta--;
maxCols = Math.max(maxCols, row.getColumnCount() + prev);
}
rows = getChildCount() + delta;
// Alloc
grid = new TableCellElementInfo[rows][];
for (int counter = 0; counter < rows; counter++) {
grid[counter] = new TableCellElementInfo[maxCols];
}
// Update
for (int counter = 0; counter < rows; counter++) {
getRow(counter).updateGrid(counter);
}
}
/**
* Returns the TableCellElementInfo at the specified index.
*/
public TableRowElementInfo getRow(int index) {
return (TableRowElementInfo)getChild(index);
}
/**
* Returns the TableCellElementInfo by row and column.
*/
public TableCellElementInfo getCell(int r, int c) {
if (validateIfNecessary() && r < grid.length &&
c < grid[0].length) {
return grid[r][c];
}
return null;
}
/**
* Returns the rowspan of the specified entry.
*/
public int getRowExtentAt(int r, int c) {
TableCellElementInfo cell = getCell(r, c);
if (cell != null) {
int rows = cell.getRowCount();
int delta = 1;
while ((r - delta) >= 0 && grid[r - delta][c] == cell) {
delta++;
}
return rows - delta + 1;
}
return 0;
}
/**
* Returns the colspan of the specified entry.
*/
public int getColumnExtentAt(int r, int c) {
TableCellElementInfo cell = getCell(r, c);
if (cell != null) {
int cols = cell.getColumnCount();
int delta = 1;
while ((c - delta) >= 0 && grid[r][c - delta] == cell) {
delta++;
}
return cols - delta + 1;
}
return 0;
}
/**
* Returns the number of rows in the table.
*/
public int getRowCount() {
if (validateIfNecessary()) {
return grid.length;
}
return 0;
}
/**
* Returns the number of columns in the table.
*/
public int getColumnCount() {
if (validateIfNecessary() && grid.length > 0) {
return grid[0].length;
}
return 0;
}
// begin AccessibleTable implementation ...
private AccessibleContext accessibleContext;
public AccessibleContext getAccessibleContext() {
if (accessibleContext == null) {
accessibleContext = new TableAccessibleContext(this);
}
return accessibleContext;
}
/*
* AccessibleContext for tables
*/
public class TableAccessibleContext extends HTMLAccessibleContext
implements AccessibleTable {
private AccessibleHeadersTable rowHeadersTable;
public TableAccessibleContext(ElementInfo elementInfo) {
super(elementInfo);
}
/**
* Gets the accessibleName property of this object. The accessibleName
* property of an object is a localized String that designates the purpose
* of the object. For example, the accessibleName property of a label
* or button might be the text of the label or button itself. In the
* case of an object that doesn't display its name, the accessibleName
* should still be set. For example, in the case of a text field used
* to enter the name of a city, the accessibleName for the en_US locale
* could be 'city.'
*
* @return the localized name of the object; null if this
* object does not have a name
*
* @see #setAccessibleName
*/
public String getAccessibleName() {
// return the role of the object
return getAccessibleRole().toString();
}
/**
* Gets the accessibleDescription property of this object. If this
* property isn't set, returns the content type of this
* <code>JEditorPane</code> instead (e.g. "plain/text", "html/text").
*
* @return the localized description of the object; <code>null</code>
* if this object does not have a description
*
* @see #setAccessibleName
*/
public String getAccessibleDescription() {
return editor.getContentType();
}
/**
* Gets the role of this object. The role of the object is the generic
* purpose or use of the class of this object. For example, the role
* of a push button is AccessibleRole.PUSH_BUTTON. The roles in
* AccessibleRole are provided so component developers can pick from
* a set of predefined roles. This enables assistive technologies to
* provide a consistent interface to various tweaked subclasses of
* components (e.g., use AccessibleRole.PUSH_BUTTON for all components
* that act like a push button) as well as distinguish between sublasses
* that behave differently (e.g., AccessibleRole.CHECK_BOX for check boxes
* and AccessibleRole.RADIO_BUTTON for radio buttons).
* <p>Note that the AccessibleRole class is also extensible, so
* custom component developers can define their own AccessibleRole's
* if the set of predefined roles is inadequate.
*
* @return an instance of AccessibleRole describing the role of the object
* @see AccessibleRole
*/
public AccessibleRole getAccessibleRole() {
return AccessibleRole.TABLE;
}
/**
* Gets the 0-based index of this object in its accessible parent.
*
* @return the 0-based index of this object in its parent; -1 if this
* object does not have an accessible parent.
*
* @see #getAccessibleParent
* @see #getAccessibleChildrenCount
* @gsee #getAccessibleChild
*/
public int getAccessibleIndexInParent() {
return elementInfo.getIndexInParent();
}
/**
* Returns the number of accessible children of the object.
*
* @return the number of accessible children of the object.
*/
public int getAccessibleChildrenCount() {
return ((TableElementInfo)elementInfo).getRowCount() *
((TableElementInfo)elementInfo).getColumnCount();
}
/**
* Returns the specified Accessible child of the object. The Accessible
* children of an Accessible object are zero-based, so the first child
* of an Accessible child is at index 0, the second child is at index 1,
* and so on.
*
* @param i zero-based index of child
* @return the Accessible child of the object
* @see #getAccessibleChildrenCount
*/
public Accessible getAccessibleChild(int i) {
int rowCount = ((TableElementInfo)elementInfo).getRowCount();
int columnCount = ((TableElementInfo)elementInfo).getColumnCount();
int r = i / rowCount;
int c = i % columnCount;
if (r < 0 || r >= rowCount || c < 0 || c >= columnCount) {
return null;
} else {
return getAccessibleAt(r, c);
}
}
public AccessibleTable getAccessibleTable() {
return this;
}
/**
* Returns the caption for the table.
*
* @return the caption for the table
*/
public Accessible getAccessibleCaption() {
ElementInfo captionInfo = getCaptionInfo();
if (captionInfo instanceof Accessible) {
return (Accessible)caption;
} else {
return null;
}
}
/**
* Sets the caption for the table.
*
* @param a the caption for the table
*/
public void setAccessibleCaption(Accessible a) {
}
/**
* Returns the summary description of the table.
*
* @return the summary description of the table
*/
public Accessible getAccessibleSummary() {
return null;
}
/**
* Sets the summary description of the table
*
* @param a the summary description of the table
*/
public void setAccessibleSummary(Accessible a) {
}
/**
* Returns the number of rows in the table.
*
* @return the number of rows in the table
*/
public int getAccessibleRowCount() {
return ((TableElementInfo)elementInfo).getRowCount();
}
/**
* Returns the number of columns in the table.
*
* @return the number of columns in the table
*/
public int getAccessibleColumnCount() {
return ((TableElementInfo)elementInfo).getColumnCount();
}
/**
* Returns the Accessible at a specified row and column
* in the table.
*
* @param r zero-based row of the table
* @param c zero-based column of the table
* @return the Accessible at the specified row and column
*/
public Accessible getAccessibleAt(int r, int c) {
TableCellElementInfo cellInfo = getCell(r, c);
if (cellInfo != null) {
return cellInfo.getAccessible();
} else {
return null;
}
}
/**
* Returns the number of rows occupied by the Accessible at
* a specified row and column in the table.
*
* @return the number of rows occupied by the Accessible at a
* given specified (row, column)
*/
public int getAccessibleRowExtentAt(int r, int c) {
return ((TableElementInfo)elementInfo).getRowExtentAt(r, c);
}
/**
* Returns the number of columns occupied by the Accessible at
* a specified row and column in the table.
*
* @return the number of columns occupied by the Accessible at a
* given specified row and column
*/
public int getAccessibleColumnExtentAt(int r, int c) {
return ((TableElementInfo)elementInfo).getColumnExtentAt(r, c);
}
/**
* Returns the row headers as an AccessibleTable.
*
* @return an AccessibleTable representing the row
* headers
*/
public AccessibleTable getAccessibleRowHeader() {
return rowHeadersTable;
}
/**
* Sets the row headers.
*
* @param table an AccessibleTable representing the
* row headers
*/
public void setAccessibleRowHeader(AccessibleTable table) {
}
/**
* Returns the column headers as an AccessibleTable.
*
* @return an AccessibleTable representing the column
* headers
*/
public AccessibleTable getAccessibleColumnHeader() {
return null;
}
/**
* Sets the column headers.
*
* @param table an AccessibleTable representing the
* column headers
*/
public void setAccessibleColumnHeader(AccessibleTable table) {
}
/**
* Returns the description of the specified row in the table.
*
* @param r zero-based row of the table
* @return the description of the row
*/
public Accessible getAccessibleRowDescription(int r) {
return null;
}
/**
* Sets the description text of the specified row of the table.
*
* @param r zero-based row of the table
* @param a the description of the row
*/
public void setAccessibleRowDescription(int r, Accessible a) {
}
/**
* Returns the description text of the specified column in the table.
*
* @param c zero-based column of the table
* @return the text description of the column
*/
public Accessible getAccessibleColumnDescription(int c) {
return null;
}
/**
* Sets the description text of the specified column in the table.
*
* @param c zero-based column of the table
* @param a the text description of the column
*/
public void setAccessibleColumnDescription(int c, Accessible a) {
}
/**
* Returns a boolean value indicating whether the accessible at
* a specified row and column is selected.
*
* @param r zero-based row of the table
* @param c zero-based column of the table
* @return the boolean value true if the accessible at the
* row and column is selected. Otherwise, the boolean value
* false
*/
public boolean isAccessibleSelected(int r, int c) {
if (validateIfNecessary()) {
if (r < 0 || r >= getAccessibleRowCount() ||
c < 0 || c >= getAccessibleColumnCount()) {
return false;
}
TableCellElementInfo cell = getCell(r, c);
if (cell != null) {
Element elem = cell.getElement();
int start = elem.getStartOffset();
int end = elem.getEndOffset();
return start >= editor.getSelectionStart() &&
end <= editor.getSelectionEnd();
}
}
return false;
}
/**
* Returns a boolean value indicating whether the specified row
* is selected.
*
* @param r zero-based row of the table
* @return the boolean value true if the specified row is selected.
* Otherwise, false.
*/
public boolean isAccessibleRowSelected(int r) {
if (validateIfNecessary()) {
if (r < 0 || r >= getAccessibleRowCount()) {
return false;
}
int nColumns = getAccessibleColumnCount();
TableCellElementInfo startCell = getCell(r, 0);
if (startCell == null) {
return false;
}
int start = startCell.getElement().getStartOffset();
TableCellElementInfo endCell = getCell(r, nColumns-1);
if (endCell == null) {
return false;
}
int end = endCell.getElement().getEndOffset();
return start >= editor.getSelectionStart() &&
end <= editor.getSelectionEnd();
}
return false;
}
/**
* Returns a boolean value indicating whether the specified column
* is selected.
*
* @param r zero-based column of the table
* @return the boolean value true if the specified column is selected.
* Otherwise, false.
*/
public boolean isAccessibleColumnSelected(int c) {
if (validateIfNecessary()) {
if (c < 0 || c >= getAccessibleColumnCount()) {
return false;
}
int nRows = getAccessibleRowCount();
TableCellElementInfo startCell = getCell(0, c);
if (startCell == null) {
return false;
}
int start = startCell.getElement().getStartOffset();
TableCellElementInfo endCell = getCell(nRows-1, c);
if (endCell == null) {
return false;
}
int end = endCell.getElement().getEndOffset();
return start >= editor.getSelectionStart() &&
end <= editor.getSelectionEnd();
}
return false;
}
/**
* Returns the selected rows in a table.
*
* @return an array of selected rows where each element is a
* zero-based row of the table
*/
public int [] getSelectedAccessibleRows() {
if (validateIfNecessary()) {
int nRows = getAccessibleRowCount();
Vector vec = new Vector();
for (int i = 0; i < nRows; i++) {
if (isAccessibleRowSelected(i)) {
vec.addElement(new Integer(i));
}
}
int retval[] = new int[vec.size()];
for (int i = 0; i < retval.length; i++) {
retval[i] = ((Integer)vec.elementAt(i)).intValue();
}
return retval;
}
return new int[0];
}
/**
* Returns the selected columns in a table.
*
* @return an array of selected columns where each element is a
* zero-based column of the table
*/
public int [] getSelectedAccessibleColumns() {
if (validateIfNecessary()) {
int nColumns = getAccessibleRowCount();
Vector vec = new Vector();
for (int i = 0; i < nColumns; i++) {
if (isAccessibleColumnSelected(i)) {
vec.addElement(new Integer(i));
}
}
int retval[] = new int[vec.size()];
for (int i = 0; i < retval.length; i++) {
retval[i] = ((Integer)vec.elementAt(i)).intValue();
}
return retval;
}
return new int[0];
}
// begin AccessibleExtendedTable implementation -------------
/**
* Returns the row number of an index in the table.
*
* @param index the zero-based index in the table
* @return the zero-based row of the table if one exists;
* otherwise -1.
*/
public int getAccessibleRow(int index) {
if (validateIfNecessary()) {
int numCells = getAccessibleColumnCount() *
getAccessibleRowCount();
if (index >= numCells) {
return -1;
} else {
return index / getAccessibleColumnCount();
}
}
return -1;
}
/**
* Returns the column number of an index in the table.
*
* @param index the zero-based index in the table
* @return the zero-based column of the table if one exists;
* otherwise -1.
*/
public int getAccessibleColumn(int index) {
if (validateIfNecessary()) {
int numCells = getAccessibleColumnCount() *
getAccessibleRowCount();
if (index >= numCells) {
return -1;
} else {
return index % getAccessibleColumnCount();
}
}
return -1;
}
/*
* Returns the index at a row and column in the table.
*
* @param r zero-based row of the table
* @param c zero-based column of the table
* @return the zero-based index in the table if one exists;
* otherwise -1.
*/
public int getAccessibleIndex(int r, int c) {
if (validateIfNecessary()) {
if (r >= getAccessibleRowCount() ||
c >= getAccessibleColumnCount()) {
return -1;
} else {
return r * getAccessibleColumnCount() + c;
}
}
return -1;
}
/**
* Returns the row header at a row in a table.
* @param r zero-based row of the table
*
* @return a String representing the row header
* if one exists; otherwise null.
*/
public String getAccessibleRowHeader(int r) {
if (validateIfNecessary()) {
TableCellElementInfo cellInfo = getCell(r, 0);
if (cellInfo.isHeaderCell()) {
View v = cellInfo.getView();
if (v != null && model != null) {
try {
return model.getText(v.getStartOffset(),
v.getEndOffset() -
v.getStartOffset());
} catch (BadLocationException e) {
return null;
}
}
}
}
return null;
}
/**
* Returns the column header at a column in a table.
* @param c zero-based column of the table
*
* @return a String representing the column header
* if one exists; otherwise null.
*/
public String getAccessibleColumnHeader(int c) {
if (validateIfNecessary()) {
TableCellElementInfo cellInfo = getCell(0, c);
if (cellInfo.isHeaderCell()) {
View v = cellInfo.getView();
if (v != null && model != null) {
try {
return model.getText(v.getStartOffset(),
v.getEndOffset() -
v.getStartOffset());
} catch (BadLocationException e) {
return null;
}
}
}
}
return null;
}
public void addRowHeader(TableCellElementInfo cellInfo, int rowNumber) {
if (rowHeadersTable == null) {
rowHeadersTable = new AccessibleHeadersTable();
}
rowHeadersTable.addHeader(cellInfo, rowNumber);
}
// end of AccessibleExtendedTable implementation ------------
protected class AccessibleHeadersTable implements AccessibleTable {
// Header information is modeled as a Hashtable of
// ArrayLists where each Hashtable entry represents
// a row containing one or more headers.
private Hashtable headers = new Hashtable();
private int rowCount = 0;
private int columnCount = 0;
public void addHeader(TableCellElementInfo cellInfo, int rowNumber) {
Integer rowInteger = new Integer(rowNumber);
ArrayList list = (ArrayList)headers.get(rowInteger);
if (list == null) {
list = new ArrayList();
headers.put(rowInteger, list);
}
list.add(cellInfo);
}
/**
* Returns the caption for the table.
*
* @return the caption for the table
*/
public Accessible getAccessibleCaption() {
return null;
}
/**
* Sets the caption for the table.
*
* @param a the caption for the table
*/
public void setAccessibleCaption(Accessible a) {
}
/**
* Returns the summary description of the table.
*
* @return the summary description of the table
*/
public Accessible getAccessibleSummary() {
return null;
}
/**
* Sets the summary description of the table
*
* @param a the summary description of the table
*/
public void setAccessibleSummary(Accessible a) {
}
/**
* Returns the number of rows in the table.
*
* @return the number of rows in the table
*/
public int getAccessibleRowCount() {
return rowCount;
}
/**
* Returns the number of columns in the table.
*
* @return the number of columns in the table
*/
public int getAccessibleColumnCount() {
return columnCount;
}
private TableCellElementInfo getElementInfoAt(int r, int c) {
ArrayList list = (ArrayList)headers.get(new Integer(r));
if (list != null) {
return (TableCellElementInfo)list.get(c);
} else {
return null;
}
}
/**
* Returns the Accessible at a specified row and column
* in the table.
*
* @param r zero-based row of the table
* @param c zero-based column of the table
* @return the Accessible at the specified row and column
*/
public Accessible getAccessibleAt(int r, int c) {
ElementInfo elementInfo = getElementInfoAt(r, c);
if (elementInfo instanceof Accessible) {
return (Accessible)elementInfo;
} else {
return null;
}
}
/**
* Returns the number of rows occupied by the Accessible at
* a specified row and column in the table.
*
* @return the number of rows occupied by the Accessible at a
* given specified (row, column)
*/
public int getAccessibleRowExtentAt(int r, int c) {
TableCellElementInfo elementInfo = getElementInfoAt(r, c);
if (elementInfo != null) {
return elementInfo.getRowCount();
} else {
return 0;
}
}
/**
* Returns the number of columns occupied by the Accessible at
* a specified row and column in the table.
*
* @return the number of columns occupied by the Accessible at a
* given specified row and column
*/
public int getAccessibleColumnExtentAt(int r, int c) {
TableCellElementInfo elementInfo = getElementInfoAt(r, c);
if (elementInfo != null) {
return elementInfo.getRowCount();
} else {
return 0;
}
}
/**
* Returns the row headers as an AccessibleTable.
*
* @return an AccessibleTable representing the row
* headers
*/
public AccessibleTable getAccessibleRowHeader() {
return null;
}
/**
* Sets the row headers.
*
* @param table an AccessibleTable representing the
* row headers
*/
public void setAccessibleRowHeader(AccessibleTable table) {
}
/**
* Returns the column headers as an AccessibleTable.
*
* @return an AccessibleTable representing the column
* headers
*/
public AccessibleTable getAccessibleColumnHeader() {
return null;
}
/**
* Sets the column headers.
*
* @param table an AccessibleTable representing the
* column headers
*/
public void setAccessibleColumnHeader(AccessibleTable table) {
}
/**
* Returns the description of the specified row in the table.
*
* @param r zero-based row of the table
* @return the description of the row
*/
public Accessible getAccessibleRowDescription(int r) {
return null;
}
/**
* Sets the description text of the specified row of the table.
*
* @param r zero-based row of the table
* @param a the description of the row
*/
public void setAccessibleRowDescription(int r, Accessible a) {
}
/**
* Returns the description text of the specified column in the table.
*
* @param c zero-based column of the table
* @return the text description of the column
*/
public Accessible getAccessibleColumnDescription(int c) {
return null;
}
/**
* Sets the description text of the specified column in the table.
*
* @param c zero-based column of the table
* @param a the text description of the column
*/
public void setAccessibleColumnDescription(int c, Accessible a) {
}
/**
* Returns a boolean value indicating whether the accessible at
* a specified row and column is selected.
*
* @param r zero-based row of the table
* @param c zero-based column of the table
* @return the boolean value true if the accessible at the
* row and column is selected. Otherwise, the boolean value
* false
*/
public boolean isAccessibleSelected(int r, int c) {
return false;
}
/**
* Returns a boolean value indicating whether the specified row
* is selected.
*
* @param r zero-based row of the table
* @return the boolean value true if the specified row is selected.
* Otherwise, false.
*/
public boolean isAccessibleRowSelected(int r) {
return false;
}
/**
* Returns a boolean value indicating whether the specified column
* is selected.
*
* @param r zero-based column of the table
* @return the boolean value true if the specified column is selected.
* Otherwise, false.
*/
public boolean isAccessibleColumnSelected(int c) {
return false;
}
/**
* Returns the selected rows in a table.
*
* @return an array of selected rows where each element is a
* zero-based row of the table
*/
public int [] getSelectedAccessibleRows() {
return new int [0];
}
/**
* Returns the selected columns in a table.
*
* @return an array of selected columns where each element is a
* zero-based column of the table
*/
public int [] getSelectedAccessibleColumns() {
return new int [0];
}
}
} // ... end AccessibleHeadersTable
/*
* ElementInfo for table rows
*/
private class TableRowElementInfo extends ElementInfo {
private TableElementInfo parent;
private int rowNumber;
TableRowElementInfo(Element e, TableElementInfo parent, int rowNumber) {
super(e, parent);
this.parent = parent;
this.rowNumber = rowNumber;
}
protected void loadChildren(Element e) {
for (int x = 0; x < e.getElementCount(); x++) {
AttributeSet attrs = e.getElement(x).getAttributes();
if (attrs.getAttribute(StyleConstants.NameAttribute) ==
HTML.Tag.TH) {
TableCellElementInfo headerElementInfo =
new TableCellElementInfo(e.getElement(x), this, true);
addChild(headerElementInfo);
AccessibleTable at =
parent.getAccessibleContext().getAccessibleTable();
TableAccessibleContext tableElement =
(TableAccessibleContext)at;
tableElement.addRowHeader(headerElementInfo, rowNumber);
} else if (attrs.getAttribute(StyleConstants.NameAttribute) ==
HTML.Tag.TD) {
addChild(new TableCellElementInfo(e.getElement(x), this,
false));
}
}
}
/**
* Returns the max of the rowspans of the cells in this row.
*/
public int getRowCount() {
int rowCount = 1;
if (validateIfNecessary()) {
for (int counter = 0; counter < getChildCount();
counter++) {
TableCellElementInfo cell = (TableCellElementInfo)
getChild(counter);
if (cell.validateIfNecessary()) {
rowCount = Math.max(rowCount, cell.getRowCount());
}
}
}
return rowCount;
}
/**
* Returns the sum of the column spans of the individual
* cells in this row.
*/
public int getColumnCount() {
int colCount = 0;
if (validateIfNecessary()) {
for (int counter = 0; counter < getChildCount();
counter++) {
TableCellElementInfo cell = (TableCellElementInfo)
getChild(counter);
if (cell.validateIfNecessary()) {
colCount += cell.getColumnCount();
}
}
}
return colCount;
}
/**
* Overriden to invalidate the table as well as
* TableRowElementInfo.
*/
protected void invalidate(boolean first) {
super.invalidate(first);
getParent().invalidate(true);
}
/**
* Places the TableCellElementInfos for this element in
* the grid.
*/
private void updateGrid(int row) {
if (validateIfNecessary()) {
boolean emptyRow = false;
while (!emptyRow) {
for (int counter = 0; counter < grid[row].length;
counter++) {
if (grid[row][counter] == null) {
emptyRow = true;
break;
}
}
if (!emptyRow) {
row++;
}
}
for (int col = 0, counter = 0; counter < getChildCount();
counter++) {
TableCellElementInfo cell = (TableCellElementInfo)
getChild(counter);
while (grid[row][col] != null) {
col++;
}
for (int rowCount = cell.getRowCount() - 1;
rowCount >= 0; rowCount--) {
for (int colCount = cell.getColumnCount() - 1;
colCount >= 0; colCount--) {
grid[row + rowCount][col + colCount] = cell;
}
}
col += cell.getColumnCount();
}
}
}
/**
* Returns the column count of the number of columns that have
* a rowcount >= rowspan.
*/
private int getColumnCount(int rowspan) {
if (validateIfNecessary()) {
int cols = 0;
for (int counter = 0; counter < getChildCount();
counter++) {
TableCellElementInfo cell = (TableCellElementInfo)
getChild(counter);
if (cell.getRowCount() >= rowspan) {
cols += cell.getColumnCount();
}
}
return cols;
}
return 0;
}
}
/**
* TableCellElementInfo is used to represents the cells of
* the table.
*/
private class TableCellElementInfo extends ElementInfo {
private Accessible accessible;
private boolean isHeaderCell;
TableCellElementInfo(Element e, ElementInfo parent) {
super(e, parent);
this.isHeaderCell = false;
}
TableCellElementInfo(Element e, ElementInfo parent,
boolean isHeaderCell) {
super(e, parent);
this.isHeaderCell = isHeaderCell;
}
/*
* Returns whether this table cell is a header
*/
public boolean isHeaderCell() {
return this.isHeaderCell;
}
/*
* Returns the Accessible representing this table cell
*/
public Accessible getAccessible() {
accessible = null;
getAccessible(this);
return accessible;
}
/*
* Gets the outermost Accessible in the table cell
*/
private void getAccessible(ElementInfo elementInfo) {
if (elementInfo instanceof Accessible) {
accessible = (Accessible)elementInfo;
return;
} else {
for (int i = 0; i < elementInfo.getChildCount(); i++) {
getAccessible(elementInfo.getChild(i));
}
}
}
/**
* Returns the rowspan attribute.
*/
public int getRowCount() {
if (validateIfNecessary()) {
return Math.max(1, getIntAttr(getAttributes(),
HTML.Attribute.ROWSPAN, 1));
}
return 0;
}
/**
* Returns the colspan attribute.
*/
public int getColumnCount() {
if (validateIfNecessary()) {
return Math.max(1, getIntAttr(getAttributes(),
HTML.Attribute.COLSPAN, 1));
}
return 0;
}
/**
* Overriden to invalidate the TableRowElementInfo as well as
* the TableCellElementInfo.
*/
protected void invalidate(boolean first) {
super.invalidate(first);
getParent().invalidate(true);
}
}
}
/**
* ElementInfo provides a slim down view of an Element. Each ElementInfo
* can have any number of child ElementInfos that are not necessarily
* direct children of the Element. As the Document changes various
* ElementInfos become invalidated. Before accessing a particular portion
* of an ElementInfo you should make sure it is valid by invoking
* <code>validateIfNecessary</code>, this will return true if
* successful, on the other hand a false return value indicates the
* ElementInfo is not valid and can never become valid again (usually
* the result of the Element the ElementInfo encapsulates being removed).
*/
private class ElementInfo {
/**
* The children of this ElementInfo.
*/
private ArrayList children;
/**
* The Element this ElementInfo is providing information for.
*/
private Element element;
/**
* The parent ElementInfo, will be null for the root.
*/
private ElementInfo parent;
/**
* Indicates the validity of the ElementInfo.
*/
private boolean isValid;
/**
* Indicates if the ElementInfo can become valid.
*/
private boolean canBeValid;
/**
* Creates the root ElementInfo.
*/
ElementInfo(Element element) {
this(element, null);
}
/**
* Creates an ElementInfo representing <code>element</code> with
* the specified parent.
*/
ElementInfo(Element element, ElementInfo parent) {
this.element = element;
this.parent = parent;
isValid = false;
canBeValid = true;
}
/**
* Validates the receiver. This recreates the children as well. This
* will be invoked within a <code>readLock</code>. If this is overriden
* it MUST invoke supers implementation first!
*/
protected void validate() {
isValid = true;
loadChildren(getElement());
}
/**
* Recreates the direct children of <code>info</code>.
*/
protected void loadChildren(Element parent) {
if (!parent.isLeaf()) {
for (int counter = 0, maxCounter = parent.getElementCount();
counter < maxCounter; counter++) {
Element e = parent.getElement(counter);
ElementInfo childInfo = createElementInfo(e, this);
if (childInfo != null) {
addChild(childInfo);
}
else {
loadChildren(e);
}
}
}
}
/**
* Returns the index of the child in the parent, or -1 for the
* root or if the parent isn't valid.
*/
public int getIndexInParent() {
if (parent == null || !parent.isValid()) {
return -1;
}
return parent.indexOf(this);
}
/**
* Returns the Element this <code>ElementInfo</code> represents.
*/
public Element getElement() {
return element;
}
/**
* Returns the parent of this Element, or null for the root.
*/
public ElementInfo getParent() {
return parent;
}
/**
* Returns the index of the specified child, or -1 if
* <code>child</code> isn't a valid child.
*/
public int indexOf(ElementInfo child) {
ArrayList children = this.children;
if (children != null) {
return children.indexOf(child);
}
return -1;
}
/**
* Returns the child ElementInfo at <code>index</code>, or null
* if <code>index</code> isn't a valid index.
*/
public ElementInfo getChild(int index) {
if (validateIfNecessary()) {
ArrayList children = this.children;
if (children != null && index >= 0 &&
index < children.size()) {
return (ElementInfo)children.get(index);
}
}
return null;
}
/**
* Returns the number of children the ElementInfo contains.
*/
public int getChildCount() {
validateIfNecessary();
return (children == null) ? 0 : children.size();
}
/**
* Adds a new child to this ElementInfo.
*/
protected void addChild(ElementInfo child) {
if (children == null) {
children = new ArrayList();
}
children.add(child);
}
/**
* Returns the View corresponding to this ElementInfo, or null
* if the ElementInfo can't be validated.
*/
protected View getView() {
if (!validateIfNecessary()) {
return null;
}
Object lock = lock();
try {
View rootView = getRootView();
Element e = getElement();
int start = e.getStartOffset();
if (rootView != null) {
return getView(rootView, e, start);
}
return null;
} finally {
unlock(lock);
}
}
/**
* Returns the Bounds for this ElementInfo, or null
* if the ElementInfo can't be validated.
*/
public Rectangle getBounds() {
if (!validateIfNecessary()) {
return null;
}
Object lock = lock();
try {
Rectangle bounds = getRootEditorRect();
View rootView = getRootView();
Element e = getElement();
if (bounds != null && rootView != null) {
try {
return rootView.modelToView(e.getStartOffset(),
Position.Bias.Forward,
e.getEndOffset(),
Position.Bias.Backward,
bounds).getBounds();
} catch (BadLocationException ble) { }
}
} finally {
unlock(lock);
}
return null;
}
/**
* Returns true if this ElementInfo is valid.
*/
protected boolean isValid() {
return isValid;
}
/**
* Returns the AttributeSet associated with the Element, this will
* return null if the ElementInfo can't be validated.
*/
protected AttributeSet getAttributes() {
if (validateIfNecessary()) {
return getElement().getAttributes();
}
return null;
}
/**
* Returns the AttributeSet associated with the View that is
* representing this Element, this will
* return null if the ElementInfo can't be validated.
*/
protected AttributeSet getViewAttributes() {
if (validateIfNecessary()) {
View view = getView();
if (view != null) {
return view.getElement().getAttributes();
}
return getElement().getAttributes();
}
return null;
}
/**
* Convenience method for getting an integer attribute from the passed
* in AttributeSet.
*/
protected int getIntAttr(AttributeSet attrs, Object key, int deflt) {
if (attrs != null && attrs.isDefined(key)) {
int i;
String val = (String)attrs.getAttribute(key);
if (val == null) {
i = deflt;
}
else {
try {
i = Math.max(0, Integer.parseInt(val));
} catch (NumberFormatException x) {
i = deflt;
}
}
return i;
}
return deflt;
}
/**
* Validates the ElementInfo if necessary. Some ElementInfos may
* never be valid again. You should check <code>isValid</code> before
* using one. This will reload the children and invoke
* <code>validate</code> if the ElementInfo is invalid and can become
* valid again. This will return true if the receiver is valid.
*/
protected boolean validateIfNecessary() {
if (!isValid() && canBeValid) {
children = null;
Object lock = lock();
try {
validate();
} finally {
unlock(lock);
}
}
return isValid();
}
/**
* Invalidates the ElementInfo. Subclasses should override this
* if they need to reset state once invalid.
*/
protected void invalidate(boolean first) {
if (!isValid()) {
if (canBeValid && !first) {
canBeValid = false;
}
return;
}
isValid = false;
canBeValid = first;
if (children != null) {
for (int counter = 0; counter < children.size(); counter++) {
((ElementInfo)children.get(counter)).invalidate(false);
}
children = null;
}
}
private View getView(View parent, Element e, int start) {
if (parent.getElement() == e) {
return parent;
}
int index = parent.getViewIndex(start, Position.Bias.Forward);
if (index != -1 && index < parent.getViewCount()) {
return getView(parent.getView(index), e, start);
}
return null;
}
private int getClosestInfoIndex(int index) {
for (int counter = 0; counter < getChildCount(); counter++) {
ElementInfo info = getChild(counter);
if (index < info.getElement().getEndOffset() ||
index == info.getElement().getStartOffset()) {
return counter;
}
}
return -1;
}
private void update(DocumentEvent e) {
if (!isValid()) {
return;
}
ElementInfo parent = getParent();
Element element = getElement();
do {
DocumentEvent.ElementChange ec = e.getChange(element);
if (ec != null) {
if (element == getElement()) {
// One of our children changed.
invalidate(true);
}
else if (parent != null) {
parent.invalidate(parent == getRootInfo());
}
return;
}
element = element.getParentElement();
} while (parent != null && element != null &&
element != parent.getElement());
if (getChildCount() > 0) {
Element elem = getElement();
int pos = e.getOffset();
int index0 = getClosestInfoIndex(pos);
if (index0 == -1 &&
e.getType() == DocumentEvent.EventType.REMOVE &&
pos >= elem.getEndOffset()) {
// Event beyond our offsets. We may have represented this,
// that is the remove may have removed one of our child
// Elements that represented this, so, we should foward
// to last element.
index0 = getChildCount() - 1;
}
ElementInfo info = (index0 >= 0) ? getChild(index0) : null;
if (info != null &&
(info.getElement().getStartOffset() == pos) && (pos > 0)) {
// If at a boundary, forward the event to the previous
// ElementInfo too.
index0 = Math.max(index0 - 1, 0);
}
int index1;
if (e.getType() != DocumentEvent.EventType.REMOVE) {
index1 = getClosestInfoIndex(pos + e.getLength());
if (index1 < 0) {
index1 = getChildCount() - 1;
}
}
else {
index1 = index0;
// A remove may result in empty elements.
while ((index1 + 1) < getChildCount() &&
getChild(index1 + 1).getElement().getEndOffset() ==
getChild(index1 + 1).getElement().getStartOffset()){
index1++;
}
}
index0 = Math.max(index0, 0);
// The check for isValid is here as in the process of
// forwarding update our child may invalidate us.
for (int i = index0; i <= index1 && isValid(); i++) {
getChild(i).update(e);
}
}
}
}
/**
* DocumentListener installed on the current Document. Will invoke
* <code>update</code> on the <code>RootInfo</code> in response to
* any event.
*/
private class DocumentHandler implements DocumentListener {
public void insertUpdate(DocumentEvent e) {
getRootInfo().update(e);
}
public void removeUpdate(DocumentEvent e) {
getRootInfo().update(e);
}
public void changedUpdate(DocumentEvent e) {
getRootInfo().update(e);
}
}
/*
* PropertyChangeListener installed on the editor.
*/
private class PropertyChangeHandler implements PropertyChangeListener {
public void propertyChange(PropertyChangeEvent evt) {
if (evt.getPropertyName().equals("document")) {
// handle the document change
setDocument(editor.getDocument());
}
}
}
}
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