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/**
* Copyright (c) 2007, Gaudenz Alder
*/
package com.mxgraph.view;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Shape;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashSet;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.w3c.dom.Element;
import com.mxgraph.canvas.mxGraphics2DCanvas;
import com.mxgraph.canvas.mxICanvas;
import com.mxgraph.canvas.mxImageCanvas;
import com.mxgraph.model.mxCell;
import com.mxgraph.model.mxGeometry;
import com.mxgraph.model.mxGraphModel;
import com.mxgraph.model.mxGraphModel.Filter;
import com.mxgraph.model.mxGraphModel.mxChildChange;
import com.mxgraph.model.mxGraphModel.mxCollapseChange;
import com.mxgraph.model.mxGraphModel.mxGeometryChange;
import com.mxgraph.model.mxGraphModel.mxRootChange;
import com.mxgraph.model.mxGraphModel.mxStyleChange;
import com.mxgraph.model.mxGraphModel.mxTerminalChange;
import com.mxgraph.model.mxGraphModel.mxValueChange;
import com.mxgraph.model.mxGraphModel.mxVisibleChange;
import com.mxgraph.model.mxICell;
import com.mxgraph.model.mxIGraphModel;
import com.mxgraph.util.mxConstants;
import com.mxgraph.util.mxEvent;
import com.mxgraph.util.mxEventObject;
import com.mxgraph.util.mxEventSource;
import com.mxgraph.util.mxImageBundle;
import com.mxgraph.util.mxPoint;
import com.mxgraph.util.mxRectangle;
import com.mxgraph.util.mxResources;
import com.mxgraph.util.mxStyleUtils;
import com.mxgraph.util.mxUndoableEdit;
import com.mxgraph.util.mxUndoableEdit.mxUndoableChange;
import com.mxgraph.util.mxUtils;
/**
* Implements a graph object that allows to create diagrams from a graph model
* and stylesheet.
*
* <h3>Images</h3>
* To create an image from a graph, use the following code for a given
* XML document (doc) and File (file):
*
* <code>
* Image img = mxCellRenderer.createBufferedImage(
* graph, null, 1, Color.WHITE, false, null);
* ImageIO.write(img, "png", file);
* </code>
*
* If the XML is given as a string rather than a document, the document can
* be obtained using mxUtils.parse.
*
* This class fires the following events:
*
* mxEvent.ROOT fires if the root in the model has changed. This event has no
* properties.
*
* mxEvent.ALIGN_CELLS fires between begin- and endUpdate in alignCells. The
* <code>cells</code> and <code>align</code> properties contain the respective
* arguments that were passed to alignCells.
*
* mxEvent.FLIP_EDGE fires between begin- and endUpdate in flipEdge. The
* <code>edge</code> property contains the edge passed to flipEdge.
*
* mxEvent.ORDER_CELLS fires between begin- and endUpdate in orderCells. The
* <code>cells</code> and <code>back</code> properties contain the respective
* arguments that were passed to orderCells.
*
* mxEvent.CELLS_ORDERED fires between begin- and endUpdate in cellsOrdered.
* The <code>cells</code> and <code>back</code> arguments contain the
* respective arguments that were passed to cellsOrdered.
*
* mxEvent.GROUP_CELLS fires between begin- and endUpdate in groupCells. The
* <code>group</code>, <code>cells</code> and <code>border</code> arguments
* contain the respective arguments that were passed to groupCells.
*
* mxEvent.UNGROUP_CELLS fires between begin- and endUpdate in ungroupCells.
* The <code>cells</code> property contains the array of cells that was passed
* to ungroupCells.
*
* mxEvent.REMOVE_CELLS_FROM_PARENT fires between begin- and endUpdate in
* removeCellsFromParent. The <code>cells</code> property contains the array of
* cells that was passed to removeCellsFromParent.
*
* mxEvent.ADD_CELLS fires between begin- and endUpdate in addCells. The
* <code>cells</code>, <code>parent</code>, <code>index</code>,
* <code>source</code> and <code>target</code> properties contain the
* respective arguments that were passed to addCells.
*
* mxEvent.CELLS_ADDED fires between begin- and endUpdate in cellsAdded. The
* <code>cells</code>, <code>parent</code>, <code>index</code>,
* <code>source</code>, <code>target</code> and <code>absolute</code>
* properties contain the respective arguments that were passed to cellsAdded.
*
* mxEvent.REMOVE_CELLS fires between begin- and endUpdate in removeCells. The
* <code>cells</code> and <code>includeEdges</code> arguments contain the
* respective arguments that were passed to removeCells.
*
* mxEvent.CELLS_REMOVED fires between begin- and endUpdate in cellsRemoved.
* The <code>cells</code> argument contains the array of cells that was
* removed.
*
* mxEvent.SPLIT_EDGE fires between begin- and endUpdate in splitEdge. The
* <code>edge</code> property contains the edge to be splitted, the
* <code>cells</code>, <code>newEdge</code>, <code>dx</code> and
* <code>dy</code> properties contain the respective arguments that were passed
* to splitEdge.
*
* mxEvent.TOGGLE_CELLS fires between begin- and endUpdate in toggleCells. The
* <code>show</code>, <code>cells</code> and <code>includeEdges</code>
* properties contain the respective arguments that were passed to toggleCells.
*
* mxEvent.FOLD_CELLS fires between begin- and endUpdate in foldCells. The
* <code>collapse</code>, <code>cells</code> and <code>recurse</code>
* properties contain the respective arguments that were passed to foldCells.
*
* mxEvent.CELLS_FOLDED fires between begin- and endUpdate in cellsFolded. The
* <code>collapse</code>, <code>cells</code> and <code>recurse</code>
* properties contain the respective arguments that were passed to cellsFolded.
*
* mxEvent.UPDATE_CELL_SIZE fires between begin- and endUpdate in
* updateCellSize. The <code>cell</code> and <code>ignoreChildren</code>
* properties contain the respective arguments that were passed to
* updateCellSize.
*
* mxEvent.RESIZE_CELLS fires between begin- and endUpdate in resizeCells. The
* <code>cells</code> and <code>bounds</code> properties contain the respective
* arguments that were passed to resizeCells.
*
* mxEvent.CELLS_RESIZED fires between begin- and endUpdate in cellsResized.
* The <code>cells</code> and <code>bounds</code> properties contain the
* respective arguments that were passed to cellsResized.
*
* mxEvent.MOVE_CELLS fires between begin- and endUpdate in moveCells. The
* <code>cells</code>, <code>dx</code>, <code>dy</code>, <code>clone</code>,
* <code>target</code> and <code>location</code> properties contain the
* respective arguments that were passed to moveCells.
*
* mxEvent.CELLS_MOVED fires between begin- and endUpdate in cellsMoved. The
* <code>cells</code>, <code>dx</code>, <code>dy</code> and
* <code>disconnect</code> properties contain the respective arguments that
* were passed to cellsMoved.
*
* mxEvent.CONNECT_CELL fires between begin- and endUpdate in connectCell. The
* <code>edge</code>, <code>terminal</code> and <code>source</code> properties
* contain the respective arguments that were passed to connectCell.
*
* mxEvent.CELL_CONNECTED fires between begin- and endUpdate in cellConnected.
* The <code>edge</code>, <code>terminal</code> and <code>source</code>
* properties contain the respective arguments that were passed to
* cellConnected.
*
* mxEvent.REPAINT fires if a repaint was requested by calling repaint. The
* <code>region</code> property contains the optional mxRectangle that was
* passed to repaint to define the dirty region.
*/
public class mxGraph extends mxEventSource
{
private static final Logger log = Logger.getLogger(mxGraph.class.getName());
/**
* Adds required resources.
*/
static
{
try
{
mxResources.add("com.mxgraph.resources.graph");
}
catch (Exception e)
{
log.log(Level.SEVERE, "Failed to add the resource bundle", e);
}
}
/**
* Holds the version number of this release. Current version
* is 4.0.0.
*/
public static final String VERSION = "4.0.0";
/**
*
*/
public interface mxICellVisitor
{
/**
*
* @param vertex
* @param edge
*/
boolean visit(Object vertex, Object edge);
}
/**
* Property change event handling.
*/
protected PropertyChangeSupport changeSupport = new PropertyChangeSupport(
this);
/**
* Holds the model that contains the cells to be displayed.
*/
protected mxIGraphModel model;
/**
* Holds the view that caches the cell states.
*/
protected mxGraphView view;
/**
* Holds the stylesheet that defines the appearance of the cells.
*/
protected mxStylesheet stylesheet;
/**
* Holds the <mxGraphSelection> that models the current selection.
*/
protected mxGraphSelectionModel selectionModel;
/**
* Specifies the grid size. Default is 10.
*/
protected int gridSize = 10;
/**
* Specifies if the grid is enabled. Default is true.
*/
protected boolean gridEnabled = true;
/**
* Specifies if ports are enabled. This is used in <cellConnected> to update
* the respective style. Default is true.
*/
protected boolean portsEnabled = true;
/**
* Value returned by getOverlap if isAllowOverlapParent returns
* true for the given cell. getOverlap is used in keepInside if
* isKeepInsideParentOnMove returns true. The value specifies the
* portion of the child which is allowed to overlap the parent.
*/
protected double defaultOverlap = 0.5;
/**
* Specifies the default parent to be used to insert new cells.
* This is used in getDefaultParent. Default is null.
*/
protected Object defaultParent;
/**
* Specifies the alternate edge style to be used if the main control point
* on an edge is being doubleclicked. Default is null.
*/
protected String alternateEdgeStyle;
/**
* Specifies the return value for isEnabled. Default is true.
*/
protected boolean enabled = true;
/**
* Specifies the return value for isCell(s)Locked. Default is false.
*/
protected boolean cellsLocked = false;
/**
* Specifies the return value for isCell(s)Editable. Default is true.
*/
protected boolean cellsEditable = true;
/**
* Specifies the return value for isCell(s)Sizable. Default is true.
*/
protected boolean cellsResizable = true;
/**
* Specifies the return value for isCell(s)Movable. Default is true.
*/
protected boolean cellsMovable = true;
/**
* Specifies the return value for isCell(s)Bendable. Default is true.
*/
protected boolean cellsBendable = true;
/**
* Specifies the return value for isCell(s)Selectable. Default is true.
*/
protected boolean cellsSelectable = true;
/**
* Specifies the return value for isCell(s)Deletable. Default is true.
*/
protected boolean cellsDeletable = true;
/**
* Specifies the return value for isCell(s)Cloneable. Default is true.
*/
protected boolean cellsCloneable = true;
/**
* Specifies the return value for isCellDisconntableFromTerminal. Default
* is true.
*/
protected boolean cellsDisconnectable = true;
/**
* Specifies the return value for isLabel(s)Clipped. Default is false.
*/
protected boolean labelsClipped = false;
/**
* Specifies the return value for edges in isLabelMovable. Default is true.
*/
protected boolean edgeLabelsMovable = true;
/**
* Specifies the return value for vertices in isLabelMovable. Default is false.
*/
protected boolean vertexLabelsMovable = false;
/**
* Specifies the return value for isDropEnabled. Default is true.
*/
protected boolean dropEnabled = true;
/**
* Specifies if dropping onto edges should be enabled. Default is true.
*/
protected boolean splitEnabled = true;
/**
* Specifies if the graph should automatically update the cell size
* after an edit. This is used in isAutoSizeCell. Default is false.
*/
protected boolean autoSizeCells = false;
/**
* <mxRectangle> that specifies the area in which all cells in the
* diagram should be placed. Uses in getMaximumGraphBounds. Use a width
* or height of 0 if you only want to give a upper, left corner.
*/
protected mxRectangle maximumGraphBounds = null;
/**
* mxRectangle that specifies the minimum size of the graph canvas inside
* the scrollpane.
*/
protected mxRectangle minimumGraphSize = null;
/**
* Border to be added to the bottom and right side when the container is
* being resized after the graph has been changed. Default is 0.
*/
protected int border = 0;
/**
* Specifies if edges should appear in the foreground regardless of their
* order in the model. This has precendence over keepEdgeInBackground
* Default is false.
*/
protected boolean keepEdgesInForeground = false;
/**
* Specifies if edges should appear in the background regardless of their
* order in the model. Default is false.
*/
protected boolean keepEdgesInBackground = false;
/**
* Specifies if the cell size should be changed to the preferred size when
* a cell is first collapsed. Default is true.
*/
protected boolean collapseToPreferredSize = true;
/**
* Specifies if negative coordinates for vertices are allowed. Default is true.
*/
protected boolean allowNegativeCoordinates = true;
/**
* Specifies the return value for isConstrainChildren. Default is true.
*/
protected boolean constrainChildren = true;
/**
* Specifies if a parent should contain the child bounds after a resize of
* the child. Default is true.
*/
protected boolean extendParents = true;
/**
* Specifies if parents should be extended according to the <extendParents>
* switch if cells are added. Default is true.
*/
protected boolean extendParentsOnAdd = true;
/**
* Specifies if the scale and translate should be reset if
* the root changes in the model. Default is true.
*/
protected boolean resetViewOnRootChange = true;
/**
* Specifies if loops (aka self-references) are allowed.
* Default is false.
*/
protected boolean resetEdgesOnResize = false;
/**
* Specifies if edge control points should be reset after
* the move of a connected cell. Default is false.
*/
protected boolean resetEdgesOnMove = false;
/**
* Specifies if edge control points should be reset after
* the the edge has been reconnected. Default is true.
*/
protected boolean resetEdgesOnConnect = true;
/**
* Specifies if loops (aka self-references) are allowed.
* Default is false.
*/
protected boolean allowLoops = false;
/**
* Specifies the multiplicities to be used for validation of the graph.
*/
protected mxMultiplicity[] multiplicities;
/**
* Specifies the default style for loops.
*/
protected mxEdgeStyle.mxEdgeStyleFunction defaultLoopStyle = mxEdgeStyle.Loop;
/**
* Specifies if multiple edges in the same direction between
* the same pair of vertices are allowed. Default is true.
*/
protected boolean multigraph = true;
/**
* Specifies if edges are connectable. Default is false.
* This overrides the connectable field in edges.
*/
protected boolean connectableEdges = false;
/**
* Specifies if edges with disconnected terminals are
* allowed in the graph. Default is false.
*/
protected boolean allowDanglingEdges = true;
/**
* Specifies if edges that are cloned should be validated and only inserted
* if they are valid. Default is true.
*/
protected boolean cloneInvalidEdges = false;
/**
* Specifies if edges should be disconnected from their terminals when they
* are moved. Default is true.
*/
protected boolean disconnectOnMove = true;
/**
* Specifies if labels should be visible. This is used in
* getLabel. Default is true.
*/
protected boolean labelsVisible = true;
/**
* Specifies the return value for isHtmlLabel. Default is false.
*/
protected boolean htmlLabels = false;
/**
* Specifies if nesting of swimlanes is allowed. Default is true.
*/
protected boolean swimlaneNesting = true;
/**
* Specifies the maximum number of changes that should be processed to find
* the dirty region. If the number of changes is larger, then the complete
* grah is repainted. A value of zero will always compute the dirty region
* for any number of changes. Default is 1000.
*/
protected int changesRepaintThreshold = 1000;
/**
* Specifies if the origin should be automatically updated.
*/
protected boolean autoOrigin = false;
/**
* Holds the current automatic origin.
*/
protected mxPoint origin = new mxPoint();
/**
* Holds the list of bundles.
*/
protected static List<mxImageBundle> imageBundles = new LinkedList<mxImageBundle>();
/**
* Fires repaint events for full repaints.
*/
protected mxIEventListener fullRepaintHandler = new mxIEventListener()
{
public void invoke(Object sender, mxEventObject evt)
{
repaint();
}
};
/**
* Fires repaint events for full repaints.
*/
protected mxIEventListener updateOriginHandler = new mxIEventListener()
{
public void invoke(Object sender, mxEventObject evt)
{
if (isAutoOrigin())
{
updateOrigin();
}
}
};
/**
* Fires repaint events for model changes.
*/
protected mxIEventListener graphModelChangeHandler = new mxIEventListener()
{
public void invoke(Object sender, mxEventObject evt)
{
mxRectangle dirty = graphModelChanged((mxIGraphModel) sender,
(List<mxUndoableChange>) ((mxUndoableEdit) evt
.getProperty("edit")).getChanges());
repaint(dirty);
}
};
/**
* Constructs a new graph with an empty
* {@link com.mxgraph.model.mxGraphModel}.
*/
public mxGraph()
{
this(null, null);
}
/**
* Constructs a new graph for the specified model. If no model is
* specified, then a new, empty {@link com.mxgraph.model.mxGraphModel} is
* used.
*
* @param model Model that contains the graph data
*/
public mxGraph(mxIGraphModel model)
{
this(model, null);
}
/**
* Constructs a new graph for the specified model. If no model is
* specified, then a new, empty {@link com.mxgraph.model.mxGraphModel} is
* used.
*
* @param stylesheet The stylesheet to use for the graph.
*/
public mxGraph(mxStylesheet stylesheet)
{
this(null, stylesheet);
}
/**
* Constructs a new graph for the specified model. If no model is
* specified, then a new, empty {@link com.mxgraph.model.mxGraphModel} is
* used.
*
* @param model Model that contains the graph data
*/
public mxGraph(mxIGraphModel model, mxStylesheet stylesheet)
{
selectionModel = createSelectionModel();
setModel((model != null) ? model : new mxGraphModel());
setStylesheet((stylesheet != null) ? stylesheet : createStylesheet());
setView(createGraphView());
}
/**
* Constructs a new selection model to be used in this graph.
*/
protected mxGraphSelectionModel createSelectionModel()
{
return new mxGraphSelectionModel(this);
}
/**
* Constructs a new stylesheet to be used in this graph.
*/
protected mxStylesheet createStylesheet()
{
return new mxStylesheet();
}
/**
* Constructs a new view to be used in this graph.
*/
protected mxGraphView createGraphView()
{
return new mxGraphView(this);
}
/**
* Returns the graph model that contains the graph data.
*
* @return Returns the model that contains the graph data
*/
public mxIGraphModel getModel()
{
return model;
}
/**
* Sets the graph model that contains the data, and fires an
* mxEvent.CHANGE followed by an mxEvent.REPAINT event.
*
* @param value Model that contains the graph data
*/
public void setModel(mxIGraphModel value)
{
if (model != null)
{
model.removeListener(graphModelChangeHandler);
}
Object oldModel = model;
model = value;
if (view != null)
{
view.revalidate();
}
model.addListener(mxEvent.CHANGE, graphModelChangeHandler);
changeSupport.firePropertyChange("model", oldModel, model);
repaint();
}
/**
* Returns the view that contains the cell states.
*
* @return Returns the view that contains the cell states
*/
public mxGraphView getView()
{
return view;
}
/**
* Sets the view that contains the cell states.
*
* @param value View that contains the cell states
*/
public void setView(mxGraphView value)
{
if (view != null)
{
view.removeListener(fullRepaintHandler);
view.removeListener(updateOriginHandler);
}
Object oldView = view;
view = value;
if (view != null)
{
view.revalidate();
}
// Listens to changes in the view
view.addListener(mxEvent.SCALE, fullRepaintHandler);
view.addListener(mxEvent.SCALE, updateOriginHandler);
view.addListener(mxEvent.TRANSLATE, fullRepaintHandler);
view.addListener(mxEvent.SCALE_AND_TRANSLATE, fullRepaintHandler);
view.addListener(mxEvent.SCALE_AND_TRANSLATE, updateOriginHandler);
view.addListener(mxEvent.UP, fullRepaintHandler);
view.addListener(mxEvent.DOWN, fullRepaintHandler);
changeSupport.firePropertyChange("view", oldView, view);
}
/**
* Returns the stylesheet that provides the style.
*
* @return Returns the stylesheet that provides the style.
*/
public mxStylesheet getStylesheet()
{
return stylesheet;
}
/**
* Sets the stylesheet that provides the style.
*
* @param value Stylesheet that provides the style.
*/
public void setStylesheet(mxStylesheet value)
{
mxStylesheet oldValue = stylesheet;
stylesheet = value;
changeSupport.firePropertyChange("stylesheet", oldValue, stylesheet);
}
/**
* Returns the cells to be selected for the given list of changes.
*/
public void addTopmostVerticesAndEdges(Object cell, List<Object> cells)
{
if (!cells.contains(cell) && model.contains(cell))
{
if (model.isVertex(cell) || model.isEdge(cell))
{
cells.add(cell);
}
else
{
int childCount = model.getChildCount(cell);
for (int i = 0; i < childCount; i++)
{
addTopmostVerticesAndEdges(model.getChildAt(cells, i), cells);
}
}
}
};
/**
* Returns the cells to be selected for the given list of changes.
*/
public Object[] getSelectionCellsForChanges(List<mxUndoableChange> changes)
{
List<Object> cells = new ArrayList<Object>();
Iterator<mxUndoableChange> it = changes.iterator();
while (it.hasNext())
{
Object change = it.next();
if (change instanceof mxChildChange)
{
addTopmostVerticesAndEdges(((mxChildChange) change).getChild(), cells);
}
else if (change instanceof mxTerminalChange)
{
addTopmostVerticesAndEdges(((mxTerminalChange) change).getCell(), cells);
}
else if (change instanceof mxValueChange)
{
addTopmostVerticesAndEdges(((mxValueChange) change).getCell(), cells);
}
else if (change instanceof mxStyleChange)
{
addTopmostVerticesAndEdges(((mxStyleChange) change).getCell(), cells);
}
else if (change instanceof mxGeometryChange)
{
addTopmostVerticesAndEdges(((mxGeometryChange) change).getCell(), cells);
}
else if (change instanceof mxCollapseChange)
{
addTopmostVerticesAndEdges(((mxCollapseChange) change).getCell(), cells);
}
else if (change instanceof mxVisibleChange)
{
mxVisibleChange vc = (mxVisibleChange) change;
if (vc.isVisible())
{
addTopmostVerticesAndEdges(((mxVisibleChange) change).getCell(), cells);
}
}
}
return cells.toArray();
}
/**
* Called when the graph model changes. Invokes processChange on each
* item of the given array to update the view accordingly.
*/
public mxRectangle graphModelChanged(mxIGraphModel sender,
List<mxUndoableChange> changes)
{
int thresh = getChangesRepaintThreshold();
boolean ignoreDirty = thresh > 0 && changes.size() > thresh;
// Ignores dirty rectangle if there was a root change
if (!ignoreDirty)
{
Iterator<mxUndoableChange> it = changes.iterator();
while (it.hasNext())
{
if (it.next() instanceof mxRootChange)
{
ignoreDirty = true;
break;
}
}
}
mxRectangle dirty = processChanges(changes, true, ignoreDirty);
view.validate();
if (isAutoOrigin())
{
updateOrigin();
}
if (!ignoreDirty)
{
mxRectangle tmp = processChanges(changes, false, ignoreDirty);
if (tmp != null)
{
if (dirty == null)
{
dirty = tmp;
}
else
{
dirty.add(tmp);
}
}
}
updateSelection();
return dirty;
}
/**
* Function: updateSelection
*
* Removes selection cells that are not in the model from the selection.
*/
protected void updateSelection()
{
Object[] cells = getSelectionCells();
List<Object> removed = new ArrayList<Object>();
for (int i = 0; i < cells.length; i++)
{
if (!model.contains(cells[i]))
{
removed.add(cells[i]);
}
}
removeSelectionCells(removed.toArray());
}
/**
* Extends the canvas by doing another validation with a shifted
* global translation if the bounds of the graph are below (0,0).
*
* The first validation is required to compute the bounds of the graph
* while the second validation is required to apply the new translate.
*/
protected void updateOrigin()
{
mxRectangle bounds = getGraphBounds();
if (bounds != null)
{
double scale = getView().getScale();
double x = bounds.getX() / scale - getBorder();
double y = bounds.getY() / scale - getBorder();
if (x < 0 || y < 0)
{
double x0 = Math.min(0, x);
double y0 = Math.min(0, y);
origin.setX(origin.getX() + x0);
origin.setY(origin.getY() + y0);
mxPoint t = getView().getTranslate();
getView().setTranslate(
new mxPoint(t.getX() - x0, t.getY() - y0));
}
else if ((x > 0 || y > 0)
&& (origin.getX() < 0 || origin.getY() < 0))
{
double dx = Math.min(-origin.getX(), x);
double dy = Math.min(-origin.getY(), y);
origin.setX(origin.getX() + dx);
origin.setY(origin.getY() + dy);
mxPoint t = getView().getTranslate();
getView().setTranslate(
new mxPoint(t.getX() - dx, t.getY() - dy));
}
}
}
/**
* Processes the changes and returns the minimal rectangle to be
* repainted in the buffer. A return value of null means no repaint
* is required.
*/
public mxRectangle processChanges(List<mxUndoableChange> changes,
boolean invalidate, boolean ignoreDirty)
{
mxRectangle bounds = null;
Iterator<mxUndoableChange> it = changes.iterator();
while (it.hasNext())
{
mxRectangle rect = processChange(it.next(), invalidate,
ignoreDirty);
if (bounds == null)
{
bounds = rect;
}
else
{
bounds.add(rect);
}
}
return bounds;
}
/**
* Processes the given change and invalidates the respective cached data
* in <view>. This fires a <root> event if the root has changed in the
* model.
*/
public mxRectangle processChange(mxUndoableChange change,
boolean invalidate, boolean ignoreDirty)
{
mxRectangle result = null;
if (change instanceof mxRootChange)
{
result = (ignoreDirty) ? null : getGraphBounds();
if (invalidate)
{
clearSelection();
removeStateForCell(((mxRootChange) change).getPrevious());
if (isResetViewOnRootChange())
{
view.setEventsEnabled(false);
try
{
view.scaleAndTranslate(1, 0, 0);
}
finally
{
view.setEventsEnabled(true);
}
}