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mxGraphModel.php
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1331 lines (1186 loc) · 27.6 KB
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<?php
/**
* Copyright (c) 2006-2013, Gaudenz Alder
*/
class mxGraphModel extends mxEventSource
{
/**
* Class: mxGraphModel
*
* Cells are the elements of the graph model. They represent the state
* of the groups, vertices and edges in a graph.
*
* Fires a graphModelChanged event after each group of changes.
*
* Variable: root
*
* Holds the root cell, which in turn contains the cells that represent the
* layers of the diagram as child cells. That is, the actual elements of the
* diagram are supposed to live in the third generation of cells and below.
*/
var $root;
/**
* Variable: cells
*
* Maps from Ids to cells.
*/
var $cells;
/**
* Variable: maintainEdgeParent
*
* Specifies if edges should automatically be moved into the nearest common
* ancestor of their terminals. Default is true.
*/
var $maintainEdgeParent = true;
/**
* Variable: createIds
*
* Specifies if the model should automatically create Ids for new cells.
* Default is true.
*/
var $createIds = true;
/**
* Variable: nextId
*
* Specifies the next Id to be created. Default is 0.
*/
var $nextId = 0;
/**
* Variable: updateLevel
*
* Counter for the depth of nested transactions. Each call to <beginUpdate>
* will increment this number and each call to <endUpdate> will decrement
* it. When the counter reaches 0, the transaction is closed and the
* respective events are fired. Initial value is 0.
*/
var $updateLevel = 0;
/**
* Constructor: mxGraphModel
*
* Constructs a new graph model using the specified root cell.
*/
function mxGraphModel($root = null)
{
if (isset($root))
{
$this->setRoot($root);
}
else
{
$this->clear();
}
}
/**
* Function: clear
*
* Sets a new root using <createRoot>.
*/
function clear()
{
$this->setRoot($this->createRoot());
}
/**
* Function: createRoot
*
* Creates a new root cell with a default layer (child 0).
*/
function createRoot()
{
$root = new mxCell();
$root->insert(new mxCell());
return $root;
}
/**
* Function: getCells
*
* Returns the internal lookup table that is used to map from Ids to cells.
*/
function getCells()
{
return $this->cells;
}
/**
* Function: setRoot
*
*/
function getCell($id)
{
$result = null;
if ($this->cells != null)
{
$result = mxUtils::getValue($this->cells, $id);
}
return $result;
}
/**
* Function: getRoot
*
* Returns the root of the model.
*/
function getRoot()
{
return $this->root;
}
/**
* Function: setRoot
*
* Sets the <root> of the model using <mxRootChange> and adds the change to
* the current transaction. This resets all datastructures in the model and
* is the preferred way of clearing an existing model. Returns the new
* root.
*
* Parameters:
*
* root - <mxCell> that specifies the new root.
*/
function setRoot($root)
{
$oldRoot = $this->root;
$this->beginUpdate();
try
{
$this->root = $root;
$this->nextId = 0;
$this->cells = null;
$this->cellAdded($root);
}
catch (Exception $e)
{
$this->endUpdate();
throw($e);
}
$this->endUpdate();
return $oldRoot;
}
//
// Cell Cloning
//
/**
* Function: cloneCell
*
* Returns a deep clone of the given <mxCell> (including
* the children) which is created using <cloneCells>.
*
* Parameters:
*
* cell - <mxCell> to be cloned.
*/
function cloneCell($cell)
{
$clones = $this->cloneCells(array($cell), true);
return $clones[0];
}
/**
* Function: cloneCells
*
* Returns an array of clones for the given array of <mxCells>.
* Depending on the value of includeChildren, a deep clone is created for
* each cell. Connections are restored based if the corresponding
* cell is contained in the passed in array.
*
* Parameters:
*
* cells - Array of <mxCell> to be cloned.
* includeChildren - Boolean indicating if the cells should be cloned
* with all descendants.
*/
function cloneCells($cells, $includeChildren=true)
{
$mapping = array();
$clones = array();
for ($i=0; $i<sizeof($cells); $i++)
{
$cell = $cells[$i];
$clne = $this->cloneCellImpl($cell, $mapping, $includeChildren);
array_push($clones, $clne);
}
for ($i=0; $i<sizeof($clones); $i++)
{
$this->restoreClone($clones[$i], $cells[$i], $mapping);
}
return $clones;
}
/**
* Function: cloneCellImpl
*
* Inner helper method for cloning cells recursively.
*/
function cloneCellImpl($cell, $mapping, $includeChildren)
{
$clne = $this->cellCloned($cell);
// Stores the clone in the lookup under the
// cell path for the original cell
$mapping[mxCellPath::create($cell)] = $clne;
if ($includeChildren)
{
$childCount = $this->getChildCount($cell);
for ($i = 0; $i < $childCount; $i++)
{
$child = $this->getChildAt($cell, $i);
$cloneChild = $this->cloneCellImpl($child, $mapping, true);
$clne->insert($cloneChild);
}
}
return $clne;
}
/**
* Function: cellCloned
*
* Hook for cloning the cell. This returns cell->copy() or
* any possible exceptions.
*/
function cellCloned($cell)
{
return $cell->copy();
}
/**
* Function: restoreClone
*
* Inner helper method for restoring the connections in
* a network of cloned cells.
*/
function restoreClone($clne, $cell, $mapping)
{
$source = $this->getTerminal($cell, true);
if ($source != null)
{
$tmp = $mapping[mxCellPath::create($source)];
if ($tmp != null)
{
$tmp->insertEdge($clne, true);
}
}
$target = $this->getTerminal($cell, false);
if ($target != null)
{
$tmp = $mapping[mxCellPath::create($target)];
if ($tmp != null)
{
$tmp->insertEdge($clne, false);
}
}
$childCount = $this->getChildCount($clne);
for ($i = 0; $i < $childCount; $i++)
{
$this->restoreClone($this->getChildAt($clne, $i),
$this->getChildAt($cell, $i), $mapping);
}
}
/**
* Function: isAncestor
*
* Returns true if the given parent is an ancestor of the given child.
*
* Parameters:
*
* parent - <mxCell> that specifies the parent.
* child - <mxCell> that specifies the child.
*/
function isAncestor($parent, $child)
{
while ($child != null && $child != $parent)
{
$child = $this->getParent($child);
}
return $child === $parent;
}
/**
* Function: contains
*
* Returns true if the model contains the given <mxCell>.
*
* Parameters:
*
* cell - <mxCell> that specifies the cell.
*/
function contains($cell)
{
return $this->isAncestor($this->root, $cell);
}
/**
* Function: getParent
*
* Returns the parent of the given cell.
*
* Parameters:
*
* cell - <mxCell> whose parent should be returned.
*/
function getParent($cell)
{
if ($cell != null)
{
return $cell->getParent();
}
return null;
}
/**
* Function: add
*
* Adds the specified child to the parent at the given index using
* <mxChildChange> and adds the change to the current transaction. If no
* index is specified then the child is appended to the parent's array of
* children. Returns the inserted child.
*
* Parameters:
*
* parent - <mxCell> that specifies the parent to contain the child.
* child - <mxCell> that specifies the child to be inserted.
* index - Optional integer that specifies the index of the child.
*/
function add($parent, $child, $index = null)
{
if ($child !== $parent && $child != null && $parent != null)
{
$parentChanged = $parent !== $this->getParent($child);
$this->beginUpdate();
try
{
$parent->insert($child, $index);
$this->cellAdded($child);
}
catch (Exception $e)
{
$this->endUpdate();
throw($e);
}
$this->endUpdate();
if ($parentChanged && $this->maintainEdgeParent)
{
$this->updateEdgeParents($child);
}
}
return $child;
}
/**
* Function: cellAdded
*
* Inner callback to update <cells> when a cell has been added. This
* implementation resolves collisions by creating new Ids.
*
* Parameters:
*
* cell - <mxCell> that specifies the cell that has been added.
*/
function cellAdded($cell)
{
if ($cell->getId() == null && $this->createIds)
{
$cell->setId($this->createId($cell));
}
if ($cell->getId() != null)
{
$collision = $this->getCell($cell->getId());
if ($collision != $cell)
{
while ($collision != null)
{
$cell->setId($this->createId($cell));
$collision = $this->getCell($cell->getId());
}
if ($this->cells == null)
{
$this->cells = array();
}
$this->cells[$cell->getId()] = $cell;
}
}
// Makes sure IDs of deleted cells are not reused
if (is_numeric($cell->getId()))
{
$this->nextId = max($this->nextId, $cell->getId() + 1);
}
$childCount = $this->getChildCount($cell);
for ($i = 0; $i < $childCount; $i++)
{
$this->cellAdded($this->getChildAt($cell, $i));
}
}
/**
* Function: createId
*
* Hook method to create an Id for the specified cell. This
* implementation increments <nextId>.
*
* Parameters:
*
* cell - <mxCell> to create the Id for.
*/
function createId($cell)
{
$id = $this->nextId;
$this->nextId++;
return $id;
}
/**
* Function: updateEdgeParents
*
* Updates the parent for all edges that are connected to cell or one of
* its descendants using <updateEdgeParent>.
*/
function updateEdgeParents($cell, $root = null)
{
// Gets the topmost node of the hierarchy
$root = $root || $this->getRoot();
// Updates edges on children first
$childCount = $this->getChildCount($cell);
for ($i = 0; $i < $childCount; $i++)
{
$child = $this->getChildAt($cell, $i);
$this->updateEdgeParents($child, $root);
}
// Updates the parents of all connected edges
$edgeCount = $this->getEdgeCount($cell);
$edges = array();
for ($i = 0; $i < $edgeCount; $i++)
{
array_push($edges, $this->getEdgeAt($cell, $i));
}
foreach ($edges as $edge)
{
// Updates edge parent if edge and child have
// a common root node (does not need to be the
// model root node)
if ($this->isAncestor($root, $edge))
{
$this->updateEdgeParent($edge, $root);
}
}
}
/**
* Function: updateEdgeParent
*
* Inner callback to update the parent of the specified <mxCell> to the
* nearest-common-ancestor of its two terminals.
*
* Parameters:
*
* edge - <mxCell> that specifies the edge.
* root - <mxCell> that represents the current root of the model.
*/
function updateEdgeParent($edge, $root)
{
$source = $this->getTerminal($edge, true);
$target = $this->getTerminal($edge, false);
$cell = null;
// Uses the first non-relative descendants of the source terminal
while ($source != null && !$this->isEdge($source) &&
$source->geometry != null && $source->geometry->relative)
{
$source = $this->getParent($source);
}
// Uses the first non-relative descendants of the target terminal
while ($target != null && !$this->isEdge($target) &&
$target->geometry != null && $target->geometry->relative)
{
$target = $this->getParent($target);
}
if ($this->isAncestor($root, $source) &&
$this->isAncestor($root, $target))
{
if ($source === $target)
{
$cell = $this->getParent($source);
}
else
{
$cell = $this->getNearestCommonAncestor($source, $target);
}
if ($cell != null &&
$this->getParent($cell) !== $this->root &&
$this->getParent($edge) !== $cell)
{
$geo = $this->getGeometry($edge);
if ($geo != null)
{
$origin1 = $this->getOrigin($this->getParent($edge));
$origin2 = $this->getOrigin($cell);
$dx = $origin2->x - $origin1->x;
$dy = $origin2->y - $origin1->y;
$geo = $geo->copy();
$geo->translate(-$dx, -$dy);
$this->setGeometry($edge, $geo);
}
$this->add($cell, $edge, $this->getChildCount($cell));
}
}
}
/**
* Function: getOrigin
*
* Returns the absolute, cummulated origin for the children inside the
* given parent as an <mxPoint>.
*/
function getOrigin($cell)
{
$result = null;
if ($cell != null)
{
$result = $this->getOrigin($this->getParent($cell));
if (!$this->isEdge($cell))
{
$geo = $this->getGeometry($cell);
if ($geo != null)
{
$result->x += $geo->x;
$result->y += $geo->y;
}
}
}
else
{
$result = new mxPoint();
}
return $result;
}
/**
* Function: getNearestCommonAncestor
*
* Returns the nearest common ancestor for the specified cells.
*
* Parameters:
*
* cell1 - <mxCell> that specifies the first cell in the tree.
* cell2 - <mxCell> that specifies the second cell in the tree.
*/
function getNearestCommonAncestor($cell1, $cell2)
{
if ($cell1 != null && $cell2 != null)
{
// Creates the cell path for the second cell
$path = mxCellPath::create($cell2);
if (isset($path) && strlen($path) > 0)
{
// Bubbles through the ancestors of the target
// cell to find the nearest common ancestor.
$cell = $cell1;
$current = mxCellPath::create($cell);
while ($cell != null)
{
$parent = $this->getParent($cell);
// Checks if the cell path is equal to the beginning
// of the given cell path
if (strpos($path, $current.mxCellPath::$PATH_SEPARATOR) === 0 &&
$parent != null)
{
return $cell;
}
$current = mxCellPath::getParentPath($current);
$cell = $parent;
}
}
}
return null;
}
/**
* Function: remove
*
* Removes the specified cell from the model using <mxChildChange> and adds
* the change to the current transaction. This operation will remove the
* cell and all of its children from the model. Returns the removed cell.
*
* Parameters:
*
* cell - <mxCell> that should be removed.
*/
function remove($cell)
{
$this->beginUpdate();
try
{
if ($cell === $this->root)
{
$this->setRoot(null);
}
else
{
$cell->removeFromParent();
}
$this->cellRemoved($cell);
}
catch (Exception $e)
{
$this->endUpdate();
throw($e);
}
$this->endUpdate();
return $cell;
}
/**
* Function: cellRemoved
*
* Inner callback to update <cells> when a cell has been removed.
*
* Parameters:
*
* cell - <mxCell> that specifies the cell that has been removed.
*/
function cellRemoved($cell)
{
if ($cell != null)
{
$childCount = $this->getChildCount($cell);
for ($i = 0; $i < $childCount; $i++)
{
$this->cellRemoved($this->getChildAt($cell, $i));
}
$cell->removeFromTerminal(true);
$cell->removeFromTerminal(false);
if ($this->cells != null && $cell->getId() != null)
{
$this->cells[$cell->getId()] = null;
}
}
}
/**
* Function: getChildCount
*
* Returns the number of children in the given cell.
*
* Parameters:
*
* cell - <mxCell> whose number of children should be returned.
*/
function getChildCount($cell)
{
return ($cell != null) ? $cell->getChildCount() : 0;
}
/**
* Function: getChildAt
*
* Returns the child of the given <mxCell> at the given index.
*
* Parameters:
*
* cell - <mxCell> that represents the parent.
* index - Integer that specifies the index of the child to be returned.
*/
function getChildAt($cell, $index)
{
if ($cell != null)
{
return $cell->getChildAt($index);
}
return null;
}
/**
* Function: getTerminal
*
* Returns the source or target <mxCell> of the given edge depending on the
* value of the boolean parameter.
*
* Parameters:
*
* edge - <mxCell> that specifies the edge.
* cource - Boolean indicating which end of the edge should be returned.
*/
function getTerminal($edge, $cource)
{
if ($edge != null)
{
return $edge->getTerminal($cource);
}
return null;
}
/**
* Function: setTerminal
*
* Sets the source or target terminal of the given <mxCell> using
* <mxTerminalChange> and adds the change to the current transaction.
* This implementation updates the parent of the edge using <updateEdgeParent>
* if required.
*
* Parameters:
*
* edge - <mxCell> that specifies the edge.
* terminal - <mxCell> that specifies the new terminal.
* isSource - Boolean indicating if the terminal is the new source or
* target terminal of the edge.
*/
function setTerminal($edge, $terminal, $source)
{
$previous = $edge->getTerminal($source);
$this->beginUpdate();
try
{
if ($terminal != null)
{
$terminal->insertEdge($edge, $source);
}
else if ($previous != null)
{
$previous->removeEdge($edge, $source);
}
}
catch (Exception $e)
{
$this->endUpdate();
throw($e);
}
$this->endUpdate();
if ($this->maintainEdgeParent)
{
$this->updateEdgeParent($edge, $this->getRoot());
}
return $terminal;
}
/**
* Function: setTerminals
*
* Sets the source and target <mxCell> of the given <mxCell> in a single
* transaction using <setTerminal> for each end of the edge.
*
* Parameters:
*
* edge - <mxCell> that specifies the edge.
* source - <mxCell> that specifies the new source terminal.
* target - <mxCell> that specifies the new target terminal.
*/
function setTerminals($edge, $source, $target)
{
$this->beginUpdate();
try
{
$this->setTerminal($edge, $source, true);
$this->setTerminal($edge, $target, false);
}
catch (Exception $e)
{
$this->endUpdate();
throw($e);
}
$this->endUpdate();
}
/**
* Function: getEdgeCount
*
* Returns the number of distinct edges connected to the given cell.
*
* Parameters:
*
* cell - <mxCell> that represents the vertex.
*/
function getEdgeCount($cell)
{
return ($cell != null) ? $cell->getEdgeCount() : 0;
}
/**
* Function: getEdgeAt
*
* Returns the edge of cell at the given index.
*
* Parameters:
*
* cell - <mxCell> that specifies the vertex.
* index - Integer that specifies the index of the edge
* to return.
*/
function getEdgeAt($cell, $index)
{
return ($cell != null) ? $cell->getEdgeAt($index) : null;
}
/**
* Function: getEdges
*
* Returns all distinct edges connected to this cell as an array of
* <mxCells>. The return value should be only be read.
*
* Parameters:
*
* cell - <mxCell> that specifies the cell.
*/
function getEdges($cell)
{
return ($cell != null) ? $cell->edges : null;
}
/**
* Function: isVertex
*
* Returns true if the given cell is a vertex.
*
* Parameters:
*
* cell - <mxCell> that represents the possible vertex.
*/
function isVertex($cell)
{
return ($cell != null) ? $cell->isVertex() : null;
}
/**
* Function: isEdge
*
* Returns true if the given cell is an edge.
*
* Parameters:
*
* cell - <mxCell> that represents the possible edge.
*/
function isEdge($cell)
{
return ($cell != null) ? $cell->isEdge() : null;
}
/**
* Function: isConnectable
*
* Returns true if the given <mxCell> is connectable. If <edgesConnectable>
* is false, then this function returns false for all edges else it returns
* the return value of <mxCell.isConnectable>.
*
* Parameters:
*
* cell - <mxCell> whose connectable state should be returned.
*/
function isConnectable($cell)
{
return ($cell != null) ? $cell->isConnectable() : false;
}
/**
* Function: getValue
*
* Returns the user object of the given <mxCell> using <mxCell.getValue>.
*
* Parameters:
*
* cell - <mxCell> whose user object should be returned.
*/
function getValue($cell)
{
return ($cell != null) ? $cell->getValue() : null;
}
/**
* Function: setValue
*
* Sets the user object of then given <mxCell> using <mxValueChange>
* and adds the change to the current transaction.
*
* Parameters:
*
* cell - <mxCell> whose user object should be changed.
* value - Object that defines the new user object.
*/
function setValue($cell, $value)
{
$this->beginUpdate();
try
{
$cell->setValue($value);
}
catch (Exception $e)
{
$this->endUpdate();
throw($e);
}
$this->endUpdate();
return $value;
}
/**
* Function: getGeometry
*
* Returns the <mxGeometry> of the given <mxCell>.
*
* Parameters:
*
* cell - <mxCell> whose geometry should be returned.
*/
function getGeometry($cell)
{
if ($cell != null)
{