diff options
Diffstat (limited to 'libjava/classpath/javax/swing/text/PlainView.java')
| -rw-r--r-- | libjava/classpath/javax/swing/text/PlainView.java | 233 |
1 files changed, 121 insertions, 112 deletions
diff --git a/libjava/classpath/javax/swing/text/PlainView.java b/libjava/classpath/javax/swing/text/PlainView.java index 18818c0..48fe37c 100644 --- a/libjava/classpath/javax/swing/text/PlainView.java +++ b/libjava/classpath/javax/swing/text/PlainView.java @@ -437,132 +437,92 @@ public class PlainView extends View implements TabExpander */ protected void updateDamage(DocumentEvent changes, Shape a, ViewFactory f) { - // Return early and do no updates if the allocation area is null - // (like the RI). - if (a == null) - return; - - float oldMaxLineLength = maxLineLength; - Rectangle alloc = a.getBounds(); - Element el = getElement(); - ElementChange ec = changes.getChange(el); - - // If ec is null then no lines were added or removed, just - // repaint the changed line - if (ec == null) - { - int line = el.getElementIndex(changes.getOffset()); - - // If characters have been removed from the current longest line - // we have to find out which one is the longest now otherwise - // the preferred x-axis span will not shrink. - if (changes.getType() == DocumentEvent.EventType.REMOVE - && el.getElement(line) == longestLine) - { - maxLineLength = -1; - if (determineMaxLineLength() != alloc.width) - preferenceChanged(this, true, false); - } - - damageLineRange(line, line, a, getContainer()); - return; - } - - Element[] removed = ec.getChildrenRemoved(); - Element[] newElements = ec.getChildrenAdded(); - - // If no Elements were added or removed, we just want to repaint - // the area containing the line that was modified - if (removed == null && newElements == null) + // This happens during initialization. + if (metrics == null) { - int line = getElement().getElementIndex(changes.getOffset()); - - damageLineRange(line, line, a, getContainer()); + updateMetrics(); + preferenceChanged(null, true, true); return; } - // Check to see if we removed the longest line, if so we have to - // search through all lines and find the longest one again. - if (removed != null) - { - for (int i = 0; i < removed.length; i++) - if (removed[i].equals(longestLine)) - { - // reset maxLineLength and search through all lines for longest one - maxLineLength = -1; - if (determineMaxLineLength() != alloc.width) - preferenceChanged(this, true, removed.length != newElements.length); - - ((JTextComponent)getContainer()).repaint(); - - return; - } - } - - // If we've reached here, that means we haven't removed the longest line - if (newElements == null) - { - // No lines were added, just repaint the container and exit - ((JTextComponent)getContainer()).repaint(); - - return; - } + Element element = getElement(); - // Make sure we have the metrics - updateMetrics(); - - // If we've reached here, that means we haven't removed the longest line - // and we have added at least one line, so we have to check if added lines - // are longer than the previous longest line - Segment seg = getLineBuffer(); - float longestNewLength = 0; - Element longestNewLine = null; + // Find longest line if it hasn't been initialized yet. + if (longestLine == null) + findLongestLine(0, element.getElementCount() - 1); - // Loop through the added lines to check their length - for (int i = 0; i < newElements.length; i++) + ElementChange change = changes.getChange(element); + if (changes.getType() == DocumentEvent.EventType.INSERT) { - Element child = newElements[i]; - int start = child.getStartOffset(); - int end = child.getEndOffset() - 1; - try - { - el.getDocument().getText(start, end - start, seg); - } - catch (BadLocationException ex) + // Handles character/line insertion. + + // Determine if lines have been added. In this case we repaint + // differently. + boolean linesAdded = true; + if (change == null) + linesAdded = false; + + // Determine the start line. + int start; + if (linesAdded) + start = change.getIndex(); + else + start = element.getElementIndex(changes.getOffset()); + + // Determine the length of the updated region. + int length = 0; + if (linesAdded) + length = change.getChildrenAdded().length - 1; + + // Update the longest line and length. + int oldMaxLength = (int) maxLineLength; + if (longestLine.getEndOffset() < changes.getOffset() + || longestLine.getStartOffset() > changes.getOffset() + + changes.getLength()) { - AssertionError ae = new AssertionError("Unexpected bad location"); - ae.initCause(ex); - throw ae; + findLongestLine(start, start + length); } - - if (seg == null || seg.array == null || seg.count == 0) - continue; - - int width = metrics.charsWidth(seg.array, seg.offset, seg.count); - if (width > longestNewLength) + else { - longestNewLine = child; - longestNewLength = width; + findLongestLine(0, element.getElementCount() - 1); } + + // Trigger a preference change so that the layout gets updated + // correctly. + preferenceChanged(null, maxLineLength != oldMaxLength, linesAdded); + + // Damage the updated line range. + int endLine = start; + if (linesAdded) + endLine = element.getElementCount() - 1; + damageLineRange(start, endLine, a, getContainer()); + } - - // Check if the longest of the new lines is longer than our previous - // longest line, and if so update our values - if (longestNewLength > maxLineLength) + else { - maxLineLength = longestNewLength; - longestLine = longestNewLine; + // Handles character/lines removals. + + // Update the longest line and length and trigger preference changed. + int oldMaxLength = (int) maxLineLength; + if (change != null) + { + // Line(s) have been removed. + findLongestLine(0, element.getElementCount() - 1); + preferenceChanged(null, maxLineLength != oldMaxLength, true); + } + else + { + // No line has been removed. + int lineNo = getElement().getElementIndex(changes.getOffset()); + Element line = getElement().getElement(lineNo); + if (longestLine == line) + { + findLongestLine(0, element.getElementCount() - 1); + preferenceChanged(null, maxLineLength != oldMaxLength, false); + } + damageLineRange(lineNo, lineNo, a, getContainer()); + } } - - // Report any changes to the preferred sizes of the view - // which may cause the underlying component to be revalidated. - boolean widthChanged = oldMaxLineLength != maxLineLength; - boolean heightChanged = removed.length != newElements.length; - if (widthChanged || heightChanged) - preferenceChanged(this, widthChanged, heightChanged); - - // Repaint the container - ((JTextComponent)getContainer()).repaint(); } /** @@ -648,5 +608,54 @@ public class PlainView extends View implements TabExpander lineBuffer = new Segment(); return lineBuffer; } + + /** + * Finds and updates the longest line in the view inside an interval of + * lines. + * + * @param start the start of the search interval + * @param end the end of the search interval + */ + private void findLongestLine(int start, int end) + { + for (int i = start; i <= end; i++) + { + int w = getLineLength(i); + if (w > maxLineLength) + { + maxLineLength = w; + longestLine = getElement().getElement(i); + } + } + } + + /** + * Determines the length of the specified line. + * + * @param line the number of the line + * + * @return the length of the line in pixels + */ + private int getLineLength(int line) + { + Element lineEl = getElement().getElement(line); + Segment buffer = getLineBuffer(); + try + { + Document doc = getDocument(); + doc.getText(lineEl.getStartOffset(), + lineEl.getEndOffset() - lineEl.getStartOffset() - 1, + buffer); + } + catch (BadLocationException ex) + { + AssertionError err = new AssertionError("Unexpected bad location"); + err.initCause(ex); + throw err; + } + + return Utilities.getTabbedTextWidth(buffer, metrics, 0, this, + lineEl.getStartOffset()); + } } |