'Is there a possibility in Java mxGraph to limit cells movement but not disable it?

I am using Java mxGraph and i have deeper nested vertices (on purpose) on 3 levels and now i am trying to keep the innermost vertices(level 3) within their parents(level 2) without executing graph.setCellsMovable(false);. I have tried to use the parents "bounding box": graph.setMaximumGraphBounds(graph.getBoundingBox(parent)); but that didn't do what i hoped it would(it didn't do anything visible to me, neither limit the level-3-vertex's movement nor limiting its max size).

So now my question: is there any method that limits the vertex's movement and not disable it? or is graph.setCellsMovable(false); the only option?

javamxgraph


Solution 1:[1]

I don't know if this is of any help, because I use the javascript version of the library... But I have complex drag and drop rules, so I overridden the mxDragSource.prototype.drop and mxGraphHandler.prototype.mouseUp functions... From there I am able to detect the drop target and implement my own custom rules to allow drag and drop for specific cells. Consider that I have different types of cells, some of them are fixed, some of them can move but only between specific swimlanes or within the same swimlane...

Solution 2:[2]

I'm not sure that my use case is the same as yours, but I had issues with cells switching parents on move. So I've overridden the moveCells method in my extension of mxGraph:

    @Override
    public Object[] moveCells(Object[] cells, double dx, double dy, boolean clone, Object target, Point location) {
        // We will not allow cells to change parent, so we move them individually while preserving their parent (by changing the target)
        Object[] movedCells =
                Arrays.stream(cells)
                        .map(cell -> super.moveCells(new Object[] { cell }, dx, dy, clone, ((mxCell) cell).getParent(), location))
                        .flatMap(Arrays::stream).toArray();
        return movedCells;
    }

This allows some movement, while preserving the cells' parents. I had issues moving across the boundary of the parent (your level2 vertices I presume). Therefore, the exact geometry of the parent matters.

Sources

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Source: Stack Overflow

Solution Source
Solution 1
Solution 2 Jacob Grydholt

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