TreeItem getItemForDifference(TreeDifference difference) {
for (int i = difference.getPath().getSegmentCount() - 1; i >= 0; i--) {
Object segment = difference.getPath().getSegment(i);
TreeItem item = (TreeItem) findItem(ComparableProvider.getComparableTreeObject(segment));
// if item is null, check for a matching difference with
// element type of EmptyElement
if (item == null) {
if (difference.getMatchingDifference().getElement() instanceof EmptyElement) {
// if not found then locate the item for the empty element
item = (TreeItem) findItem(difference.getMatchingDifference().getElement());
}
}
if (item != null && !item.isDisposed()) {
TreeItem[] topItems = getTree().getItems();
for (TreeItem top : topItems) {
if (top == item) {
return item;
}
}
// else check for expanded state
if (item.getParentItem().getExpanded() && !item.getBounds().isEmpty()) {
return item;
}
}
}
return null;
}
public static boolean differenceIsGraphical(TreeDifference difference) {
Object diffElement = difference.getElement();
if (diffElement instanceof EmptyElement) {
diffElement = ((EmptyElement) diffElement).getParent();
diffElement = ComparableProvider.getComparableTreeObject(diffElement);
}
if (diffElement == null) {
diffElement = difference.getMatchingDifference().getElement();
}
if (diffElement != null) {
return differenceElementIsGraphical(diffElement);
}
return false;
}
public static TreeItem getPreviousItem(TreeItem parent, TreeDifference difference) {
int location = difference.getLocation();
TreeItem[] items = parent.getItems();
TreeItem prevItem = null;
if (items.length == 0) {
prevItem = parent;
} else if (items.length <= location) {
prevItem = items[items.length - 1];
} else if (location < 0) {
prevItem = parent;
} else {
if (location == 0) {
prevItem = items[0];
} else {
prevItem = items[location - 1];
}
}
return prevItem;
}
protected void highlightDifferences(GC gc) {
// if the differencer is null then we are currently
// in the middle of a content update, skip this paint
// request
if (mergeViewer.getDifferencer() == null) {
return;
}
gc.setAdvanced(true);
gc.setAntialias(SWT.ON);
Tree tree = getTree();
List<TreeDifference> differences = mergeViewer.getDifferencer().getLeftDifferences();
if (mergeViewer.getLeftViewer() != this && mergeViewer.getAncestorTree() != this) {
differences = mergeViewer.getDifferencer().getRightDifferences();
}
for (TreeDifference difference : differences) {
if (differenceIsGraphical(difference)) {
// we do not include graphical differences
// at this time
continue;
}
gc.setForeground(
getMergeViewer()
.getColor(
PlatformUI.getWorkbench().getDisplay(),
getMergeViewer().getStrokeColor(difference)));
TreeItem item = getItemForDifference(difference);
if (item == null || item.isDisposed()) {
continue;
}
Rectangle highlightBounds =
buildHighlightRectangle(
item, difference.getIncludeChildren() && item.getExpanded(), gc, false, true);
Rectangle itemBounds = buildHighlightRectangle(item, false, gc, false, true);
boolean itemMatchesDifference = difference.getElement().equals(item.getData());
if (!itemMatchesDifference && !(item.getData() instanceof EmptyElement)) {
gc.setLineDash(new int[] {3});
gc.setLineStyle(SWT.LINE_CUSTOM);
} else {
gc.setLineStyle(SWT.LINE_SOLID);
}
gc.drawRoundRectangle(
highlightBounds.x,
highlightBounds.y,
highlightBounds.width,
highlightBounds.height,
5,
5);
if (mergeViewer.getLeftViewer() == this) {
gc.drawLine(
highlightBounds.x + highlightBounds.width,
highlightBounds.y + (itemBounds.height / 2),
tree.getClientArea().x + tree.getClientArea().width,
highlightBounds.y + (itemBounds.height / 2));
} else {
gc.drawLine(
highlightBounds.x,
highlightBounds.y + (itemBounds.height / 2),
tree.getClientArea().x,
highlightBounds.y + (itemBounds.height / 2));
}
gc.setLineStyle(SWT.LINE_SOLID);
}
}