/**
* Returns the fold that should be collapsed/expanded in the caret row
*
* @param hierarchy hierarchy under which all folds should be collapsed/expanded.
* @param dot caret position offset
* @param lineStart offset of the start of line
* @param lineEnd offset of the end of line
* @return the fold that meet common criteria in accordance with the caret position
*/
private static Fold getLineFold(FoldHierarchy hierarchy, int dot, int lineStart, int lineEnd) {
Fold caretOffsetFold = FoldUtilities.findOffsetFold(hierarchy, dot);
// beginning searching from the lineStart
Fold fold = FoldUtilities.findNearestFold(hierarchy, lineStart);
while (fold != null
&& (fold.getEndOffset() <= dot
|| // find next available fold if the 'fold' is one-line
// or it has children and the caret is in the fold body
// i.e. class A{ |public void method foo(){}}
(!fold.isCollapsed() && fold.getFoldCount() > 0 && fold.getStartOffset() + 1 < dot))) {
// look for next fold in forward direction
Fold nextFold =
FoldUtilities.findNearestFold(
hierarchy,
(fold.getFoldCount() > 0) ? fold.getStartOffset() + 1 : fold.getEndOffset());
if (nextFold != null && nextFold.getStartOffset() < lineEnd) {
if (nextFold == fold) return fold;
fold = nextFold;
} else {
break;
}
}
// a fold on the next line was found, returning fold at offset (in most cases inner class)
if (fold == null || fold.getStartOffset() > lineEnd) {
// in the case:
// class A{
// } |
// try to find an offset fold on the offset of the line beginning
if (caretOffsetFold == null) {
caretOffsetFold = FoldUtilities.findOffsetFold(hierarchy, lineStart);
}
return caretOffsetFold;
}
// no fold at offset found, in this case return the fold
if (caretOffsetFold == null) return fold;
// skip possible inner class members validating if the innerclass fold is collapsed
if (caretOffsetFold.isCollapsed()) return caretOffsetFold;
// in the case:
// class A{
// public vo|id foo(){} }
// 'fold' (in this case fold of the method foo) will be returned
if (caretOffsetFold.getEndOffset() > fold.getEndOffset() && fold.getEndOffset() > dot) {
return fold;
}
// class A{
// |} public void method foo(){}
// inner class fold will be returned
if (fold.getStartOffset() > caretOffsetFold.getEndOffset()) return caretOffsetFold;
// class A{
// public void foo(){} |}
// returning innerclass fold
if (fold.getEndOffset() < dot) return caretOffsetFold;
return fold;
}
