/** Update the child views in response to a document event. */
void updateChildren(DocumentEvent e, Shape a) {
Element elem = getElement();
DocumentEvent.ElementChange ec = e.getChange(elem);
// This occurs when syntax highlighting only changes on lines
// (i.e. beginning a multiline comment).
if (e.getType() == DocumentEvent.EventType.CHANGE) {
// System.err.println("Updating the damage due to a CHANGE event...");
// FIXME: Make me repaint more intelligently.
getContainer().repaint();
// damageLineRange(startLine,endLine, a, host);
} else if (ec != null) {
// the structure of this element changed.
Element[] removedElems = ec.getChildrenRemoved();
Element[] addedElems = ec.getChildrenAdded();
View[] added = new View[addedElems.length];
for (int i = 0; i < addedElems.length; i++) added[i] = new WrappedLine(addedElems[i]);
// System.err.println("Replacing " + removedElems.length +
// " children with " + addedElems.length);
replace(ec.getIndex(), removedElems.length, added);
// should damge a little more intelligently.
if (a != null) {
preferenceChanged(null, true, true);
getContainer().repaint();
}
}
// update font metrics which may be used by the child views
updateMetrics();
}
/**
* Repaint the region of change covered by the given document event. Damages the line that begins
* the range to cover the case when the insert/remove is only on one line. If lines are added or
* removed, damages the whole view. The longest line is checked to see if it has changed.
*/
protected void updateDamage(DocumentEvent changes, Shape a, ViewFactory f) {
Component host = getContainer();
updateMetrics();
Element elem = getElement();
DocumentEvent.ElementChange ec = changes.getChange(elem);
Element[] added = (ec != null) ? ec.getChildrenAdded() : null;
Element[] removed = (ec != null) ? ec.getChildrenRemoved() : null;
if (((added != null) && (added.length > 0)) || ((removed != null) && (removed.length > 0))) {
// lines were added or removed...
if (added != null) {
int addedAt = ec.getIndex(); // FIXME: Is this correct?????
for (int i = 0; i < added.length; i++) possiblyUpdateLongLine(added[i], addedAt + i);
}
if (removed != null) {
for (int i = 0; i < removed.length; i++) {
if (removed[i] == longLine) {
longLineWidth = -1; // Must do this!!
calculateLongestLine();
break;
}
}
}
preferenceChanged(null, true, true);
host.repaint();
}
// This occurs when syntax highlighting only changes on lines
// (i.e. beginning a multiline comment).
else if (changes.getType() == DocumentEvent.EventType.CHANGE) {
// System.err.println("Updating the damage due to a CHANGE event...");
int startLine = changes.getOffset();
int endLine = changes.getLength();
damageLineRange(startLine, endLine, a, host);
} else {
Element map = getElement();
int line = map.getElementIndex(changes.getOffset());
damageLineRange(line, line, a, host);
if (changes.getType() == DocumentEvent.EventType.INSERT) {
// check to see if the line is longer than current
// longest line.
Element e = map.getElement(line);
if (e == longLine) {
// We must recalculate longest line's width here
// because it has gotten longer.
longLineWidth = getLineWidth(line);
preferenceChanged(null, true, false);
} else {
// If long line gets updated, update the status bars too.
if (possiblyUpdateLongLine(e, line)) preferenceChanged(null, true, false);
}
} else if (changes.getType() == DocumentEvent.EventType.REMOVE) {
if (map.getElement(line) == longLine) {
// removed from longest line... recalc
longLineWidth = -1; // Must do this!
calculateLongestLine();
preferenceChanged(null, true, false);
}
}
}
}
/**
* Gives notification from the document that attributes were changed in a location that this view
* is responsible for. To reduce the burden to subclasses, this functionality is spread out into
* the following calls that subclasses can reimplement:
*
* <ol>
* <li><a href="#updateChildren">updateChildren</a> is called if there were any changes to the
* element this view is responsible for. If this view has child views that are represent the
* child elements, then this method should do whatever is necessary to make sure the child
* views correctly represent the model.
* <li><a href="#forwardUpdate">forwardUpdate</a> is called to forward the DocumentEvent to the
* appropriate child views.
* <li><a href="#updateLayout">updateLayout</a> is called to give the view a chance to either
* repair its layout, to reschedule layout, or do nothing.
* </ol>
*
* @param e the change information from the associated document
* @param a the current allocation of the view
* @param f the factory to use to rebuild if the view has children
* @see View#changedUpdate
*/
public void changedUpdate(DocumentEvent e, Shape a, ViewFactory f) {
if (getViewCount() > 0) {
Element elem = getElement();
DocumentEvent.ElementChange ec = e.getChange(elem);
if (ec != null) {
if (!updateChildren(ec, e, f)) {
// don't consider the element changes they
// are for a view further down.
ec = null;
}
}
forwardUpdate(ec, e, a, f);
updateLayout(ec, e, a);
}
}
protected void documentChanged(DocumentEvent evt) {
DocumentEvent.ElementChange ch = evt.getChange(document.getDefaultRootElement());
int count;
if (ch == null) count = 0;
else count = ch.getChildrenAdded().length - ch.getChildrenRemoved().length;
int line = getLineOfOffset(evt.getOffset());
if (count == 0) {
painter.invalidateLine(line);
}
// do magic stuff
else if (line < firstLine) {
setFirstLine(firstLine + count);
}
// end of magic stuff
else {
painter.invalidateLineRange(line, firstLine + visibleLines);
updateScrollBars();
}
}
