/**
* Returns the start offset of the next sibling of the parent element. Returns -1 if there is no
* previous sibling in the parent.
*
* @param vexWidget VexWidget to use.
*/
public static int getPreviousSiblingStart(IVexWidget vexWidget) {
int startOffset;
if (vexWidget.hasSelection()) {
startOffset = vexWidget.getSelectionStart();
} else {
Box box =
vexWidget.findInnermostBox(
new IBoxFilter() {
public boolean matches(Box box) {
return box instanceof BlockBox && box.getElement() != null;
}
});
if (box.getElement() == vexWidget.getDocument().getRootElement()) {
return -1;
}
startOffset = box.getElement().getStartOffset();
}
int previousSiblingStart = -1;
VEXElement parent = vexWidget.getDocument().getElementAt(startOffset);
List<VEXNode> children = parent.getChildNodes();
for (VEXNode child : children) {
if (startOffset == child.getStartOffset()) {
break;
}
previousSiblingStart = child.getStartOffset();
}
return previousSiblingStart;
}
/**
* Iterate over all rows in the table containing the caret.
*
* @param vexWidget IVexWidget to iterate over.
* @param callback Caller-provided callback that this method calls for each row in the current
* table.
*/
public static void iterateTableRows(IVexWidget vexWidget, ElementOrRangeCallback callback) {
final StyleSheet ss = vexWidget.getStyleSheet();
final VEXDocument doc = vexWidget.getDocument();
final int offset = vexWidget.getCaretOffset();
// This may or may not be a table
// In any case, it's the element that contains the top-level table
// children
VEXElement table = doc.getElementAt(offset);
while (table != null && !LayoutUtils.isTableChild(ss, table)) {
table = table.getParent();
}
while (table != null && LayoutUtils.isTableChild(ss, table)) {
table = table.getParent();
}
if (table == null || table.getParent() == null) {
return;
}
final List<Element> tableChildren = new ArrayList<Element>();
final boolean[] found = new boolean[] {false};
LayoutUtils.iterateChildrenByDisplayStyle(
ss,
LayoutUtils.TABLE_CHILD_STYLES,
table,
new ElementOrRangeCallback() {
public void onElement(Element child, String displayStyle) {
if (offset >= child.getStartOffset() && offset <= child.getEndOffset()) {
found[0] = true;
}
tableChildren.add(child);
}
public void onRange(VEXElement parent, int startOffset, int endOffset) {
if (!found[0]) {
tableChildren.clear();
}
}
});
if (!found[0]) {
return;
}
int startOffset = tableChildren.get(0).getStartOffset();
int endOffset = tableChildren.get(tableChildren.size() - 1).getEndOffset() + 1;
LayoutUtils.iterateTableRows(ss, table, startOffset, endOffset, callback);
}