com.mxgraph.layout
Class mxGraphLayout

java.lang.Object
  com.mxgraph.layout.mxGraphLayout

All Implemented Interfaces:

mxIGraphLayout

Direct Known Subclasses:

mxCircleLayout, mxCompactTreeLayout, mxEdgeLabelLayout, mxFastOrganicLayout, mxHierarchicalLayout, mxOrganicLayout, mxOrthogonalLayout, mxParallelEdgeLayout, mxPartitionLayout, mxStackLayout

public abstract class mxGraphLayout
extends Object
implements mxIGraphLayout

Abstract bass class for layouts

Field Summary

protected mxGraph	graph Holds the enclosing graph.
protected Object	parent The parent cell of the layout, if any
protected boolean	useBoundingBox Boolean indicating if the bounding box of the label should be used if its available.

Constructor Summary

mxGraphLayout(mxGraph graph)
Constructs a new fast organic layout for the specified graph.

Method Summary

void	arrangeGroups(Object[] groups, int border) Updates the bounds of the given groups to include all children.
void	execute(Object parent) Executes the layout for the children of the specified parent.
Object	getConstraint(Object key, Object cell) Returns the constraint for the given key and cell.
Object	getConstraint(Object key, Object cell, Object edge, boolean source) Returns the constraint for the given key and cell.
mxGraph	getGraph() Returns the associated graph.
mxPoint	getParentOffset(Object parent)
mxRectangle	getVertexBounds(Object vertex) Returns an that defines the bounds of the given cell or the bounding box if is true.
boolean	isEdgeIgnored(Object edge) Returns true if the given edge has no source or target terminal.
boolean	isUseBoundingBox()
boolean	isVertexIgnored(Object vertex) Returns true if the given vertex has no connected edges.
boolean	isVertexMovable(Object vertex) Returns true if the given vertex may be moved by the layout.
void	moveCell(Object cell, double x, double y) Notified when a cell is being moved in a parent that has automatic layout to update the cell state (eg.
void	setEdgePoints(Object edge, List<mxPoint> points) Sets the control points of the given edge to the given list of mxPoints.
void	setEdgeStyleEnabled(Object edge, boolean value) Disables or enables the edge style of the given edge.
void	setOrthogonalEdge(Object edge, boolean value) Disables or enables orthogonal end segments of the given edge
void	setUseBoundingBox(boolean useBoundingBox)
mxRectangle	setVertexLocation(Object vertex, double x, double y) Sets the new position of the given cell taking into account the size of the bounding box if is true.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

graph

protected mxGraph graph

Holds the enclosing graph.

parent

protected Object parent

The parent cell of the layout, if any

useBoundingBox

protected boolean useBoundingBox

Boolean indicating if the bounding box of the label should be used if its available. Default is true.

Constructor Detail

mxGraphLayout

public mxGraphLayout(mxGraph graph)

Constructs a new fast organic layout for the specified graph.

Method Detail

execute

public void execute(Object parent)

Description copied from interface: mxIGraphLayout

Executes the layout for the children of the specified parent.

Specified by:

execute in interface mxIGraphLayout

Parameters:

parent - Parent cell that contains the children to be layed out.

moveCell

public void moveCell(Object cell,
                     double x,
                     double y)

Description copied from interface: mxIGraphLayout

Notified when a cell is being moved in a parent that has automatic layout to update the cell state (eg. index) so that the outcome of the layout will position the vertex as close to the point (x, y) as possible.

Specified by:

moveCell in interface mxIGraphLayout

Parameters:

cell - Cell which is being moved.

x - X-coordinate of the new cell location.

y - Y-coordinate of the new cell location.

getGraph

public mxGraph getGraph()

Returns the associated graph.

getConstraint

public Object getConstraint(Object key,
                            Object cell)

Returns the constraint for the given key and cell. This implementation always returns the value for the given key in the style of the given cell.

Parameters:

key - Key of the constraint to be returned.

cell - Cell whose constraint should be returned.

getConstraint

public Object getConstraint(Object key,
                            Object cell,
                            Object edge,
                            boolean source)

Returns the constraint for the given key and cell. The optional edge and source arguments are used to return inbound and outgoing routing- constraints for the given edge and vertex. This implementation always returns the value for the given key in the style of the given cell.

Parameters:

key - Key of the constraint to be returned.

cell - Cell whose constraint should be returned.

edge - Optional cell that represents the connection whose constraint should be returned. Default is null.

source - Optional boolean that specifies if the connection is incoming or outgoing. Default is false.

isUseBoundingBox

public boolean isUseBoundingBox()

Returns:

the useBoundingBox

setUseBoundingBox

public void setUseBoundingBox(boolean useBoundingBox)

Parameters:

useBoundingBox - the useBoundingBox to set

isVertexMovable

public boolean isVertexMovable(Object vertex)

Returns true if the given vertex may be moved by the layout.

Parameters:

vertex - Object that represents the vertex to be tested.

Returns:

Returns true if the vertex can be moved.

isVertexIgnored

public boolean isVertexIgnored(Object vertex)

Returns true if the given vertex has no connected edges.

Parameters:

vertex - Object that represents the vertex to be tested.

Returns:

Returns true if the vertex should be ignored.

isEdgeIgnored

public boolean isEdgeIgnored(Object edge)

Returns true if the given edge has no source or target terminal.

Parameters:

edge - Object that represents the edge to be tested.

Returns:

Returns true if the edge should be ignored.

setEdgeStyleEnabled

public void setEdgeStyleEnabled(Object edge,
                                boolean value)

Disables or enables the edge style of the given edge.

setOrthogonalEdge

public void setOrthogonalEdge(Object edge,
                              boolean value)

Disables or enables orthogonal end segments of the given edge

getParentOffset

public mxPoint getParentOffset(Object parent)

setEdgePoints

public void setEdgePoints(Object edge,
                          List<mxPoint> points)

Sets the control points of the given edge to the given list of mxPoints. Set the points to null to remove all existing points for an edge.

getVertexBounds

public mxRectangle getVertexBounds(Object vertex)

Returns an that defines the bounds of the given cell or the bounding box if is true.

setVertexLocation

public mxRectangle setVertexLocation(Object vertex,
                                     double x,
                                     double y)

Sets the new position of the given cell taking into account the size of the bounding box if is true. The change is only carried out if the new location is not equal to the existing location, otherwise the geometry is not replaced with an updated instance. The new or old bounds are returned (including overlapping labels). Parameters: cell - whose geometry is to be set. x - Integer that defines the x-coordinate of the new location. y - Integer that defines the y-coordinate of the new location.

arrangeGroups

public void arrangeGroups(Object[] groups,
                          int border)

Updates the bounds of the given groups to include all children. Call this with the groups in parent to child order, top-most group first, eg. arrangeGroups(graph, mxUtils.sortCells(Arrays.asList( new Object[] { v1, v3 }), true).toArray(), 10);

Parameters:

groups - the groups to adjust

border - the border applied to the adjusted groups