org.eclipse.gef4.layout.algorithms

Interface SpaceTreeLayoutAlgorithm.ExpandCollapseManager

Enclosing class:

SpaceTreeLayoutAlgorithm

public static interface SpaceTreeLayoutAlgorithm.ExpandCollapseManager

A manager that controls expanding and collapsing nodes in a Graph.

Method Summary

Modifier and Type	Method and Description
boolean	canCollapse(ILayoutContext context, INodeLayout node) Checks if given node can be collapsed.
boolean	canExpand(ILayoutContext context, INodeLayout node) Checks if given node can be expanded.
void	initExpansion(ILayoutContext context) Initializes the expansion state of all nodes in given layout context.
void	setExpanded(ILayoutContext context, INodeLayout node, boolean expanded) Changes the expanded state of given node.

Method Detail

initExpansion

void initExpansion(ILayoutContext context)

Initializes the expansion state of all nodes in given layout context. The receiver can initialize its internal state related to the layout context and add its listeners if necessary.

Parameters:

context - the context to initialize

setExpanded

void setExpanded(ILayoutContext context,
                 INodeLayout node,
                 boolean expanded)

Changes the expanded state of given node. It prunes/unprunes nodes and hides/shows connections in the graph according to its policy. If requested operation cannot be currently performed on the node, it does nothing.

Parameters:

context - context in which to perform the operation

node - node to expand or collapse

expanded - true to expand, false to collapse

canExpand

boolean canExpand(ILayoutContext context,
                  INodeLayout node)

Checks if given node can be expanded.

Parameters:

context - context containing the node

node - node to check

Returns:

whether the give node can be expanded

canCollapse

boolean canCollapse(ILayoutContext context,
                    INodeLayout node)

Checks if given node can be collapsed.

Parameters:

context - context containing the node

node - node to check

Returns:

whether the given node can be collapsed