Class TreeLayoutAlgorithm
java.lang.Object
org.eclipse.gef.layout.algorithms.TreeLayoutAlgorithm
- All Implemented Interfaces:
ILayoutAlgorithm
The TreeLayoutAlgorithm class implements a simple algorithm to arrange graph
nodes in a layered tree-like layout.
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Field Summary
FieldsModifier and TypeFieldDescriptionstatic final int
Tree direction constant for which root is placed at the bottom and branches spread upwardsstatic final int
Tree direction constant for which root is placed at the left and branches spread to the rightstatic final int
Tree direction constant for which root is placed at the right and branches spread to the leftstatic final int
Tree direction constant for which root is placed at the top and branches spread downwards -
Constructor Summary
ConstructorsConstructorDescriptionCreate a default Tree Layout.TreeLayoutAlgorithm
(int direction) Create a Tree Layout with a specified direction.TreeLayoutAlgorithm
(int direction, Dimension nodeSpace) Create a Tree Layout with fixed size spacing around nodes. -
Method Summary
Modifier and TypeMethodDescriptionvoid
applyLayout
(LayoutContext layoutContext, boolean clean) Makes this algorithm perform layout computation and apply it to its context.int
Returns the direction of thisTreeLayoutAlgorithm
.boolean
void
setDirection
(int direction) Changes the direction of thisTreeLayoutAlgorithm
to the given value.void
setNodeSpace
(Dimension nodeSpace) void
setResizing
(boolean resizing) toString()
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Field Details
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TOP_DOWN
public static final int TOP_DOWNTree direction constant for which root is placed at the top and branches spread downwards- See Also:
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BOTTOM_UP
public static final int BOTTOM_UPTree direction constant for which root is placed at the bottom and branches spread upwards- See Also:
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LEFT_RIGHT
public static final int LEFT_RIGHTTree direction constant for which root is placed at the left and branches spread to the right- See Also:
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RIGHT_LEFT
public static final int RIGHT_LEFTTree direction constant for which root is placed at the right and branches spread to the left- See Also:
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Constructor Details
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TreeLayoutAlgorithm
public TreeLayoutAlgorithm()Create a default Tree Layout. -
TreeLayoutAlgorithm
public TreeLayoutAlgorithm(int direction) Create a Tree Layout with a specified direction.- Parameters:
direction
- The direction, one ofBOTTOM_UP
,LEFT_RIGHT
,RIGHT_LEFT
,TOP_DOWN
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TreeLayoutAlgorithm
Create a Tree Layout with fixed size spacing around nodes. If nodeSpace is not null, the layout will size the container to the ideal space to just contain all nodes of fixed size without any overlap. Otherwise, the algorithm will size for the container's available space.- Parameters:
direction
- The direction, one ofBOTTOM_UP
,LEFT_RIGHT
,RIGHT_LEFT
,TOP_DOWN
nodeSpace
- the size to make each node. May be null.
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Method Details
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setNodeSpace
- Parameters:
nodeSpace
- the nodeSpace size to set
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getDirection
public int getDirection()Returns the direction of thisTreeLayoutAlgorithm
.- Returns:
- The direction of this
TreeLayoutAlgorithm
.
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setDirection
public void setDirection(int direction) Changes the direction of thisTreeLayoutAlgorithm
to the given value. The direction may either beTOP_DOWN
,BOTTOM_UP
,LEFT_RIGHT
, orRIGHT_LEFT
.- Parameters:
direction
- The new direction for thisTreeLayoutAlgorithm
.
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isResizing
public boolean isResizing()- Returns:
- true if this algorithm is set to resize elements
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setResizing
public void setResizing(boolean resizing) - Parameters:
resizing
- true if this algorithm should resize elements (default is false)
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applyLayout
Description copied from interface:ILayoutAlgorithm
Makes this algorithm perform layout computation and apply it to its context.- Specified by:
applyLayout
in interfaceILayoutAlgorithm
- Parameters:
layoutContext
- TheLayoutContext
that provides all relevant information about what to layout.clean
- if true the receiver should assume that the layout context has changed significantly and recompute the whole layout even if it keeps track of changes with listeners. False can be used after dynamic layout in a context is turned back on so that layout algorithm working in background can apply accumulated changes. Static layout algorithm can ignore this call entirely if clean is false.
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toString
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