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## com.mxgraph.view
Class mxGraphView

    java.lang.Object
      com.mxgraph.util.mxEventSource
          com.mxgraph.view.mxGraphView

    public class mxGraphView

extends mxEventSource

Implements a view for the graph. This class is in charge of computing the absolute coordinates for the relative child geometries, the points for perimeters and edge styles and keeping them cached in cell states for faster retrieval. The states are updated whenever the model or the view state (translate, scale) changes. The scale and translate are honoured in the bounds. This class fires the following events: mxEvent.UNDO fires after the root was changed in setCurrentRoot. The `edit` property contains the mxUndoableEdit which contains the mxCurrentRootChange. mxEvent.SCALE_AND_TRANSLATE fires after the scale and transle have been changed in scaleAndTranslate. The `scale`, `previousScale`, `translate` and `previousTranslate` properties contain the new and previous scale and translate, respectively. mxEvent.SCALE fires after the scale was changed in setScale. The `scale` and `previousScale` properties contain the new and previous scale. mxEvent.TRANSLATE fires after the translate was changed in setTranslate. The `translate` and `previousTranslate` properties contain the new and previous value for translate. mxEvent.UP and mxEvent.DOWN fire if the current root is changed by executing a mxCurrentRootChange. The event name depends on the location of the root in the cell hierarchy with respect to the current root. The `root` and `previous` properties contain the new and previous root, respectively.

Nested Class Summary
`static class` | `mxGraphView.mxCurrentRootChange` Action to change the current root in a view.

Nested classes/interfaces inherited from class com.mxgraph.util.mxEventSource
`mxEventSource.mxIEventListener`

Field Summary
`protected Object` | `currentRoot` mxCell that acts as the root of the displayed cell hierarchy.
`protected mxGraph` | `graph` Reference to the enclosing graph.
`protected mxRectangle` | `graphBounds` Caches the current bounds of the graph.
`protected double` | `scale` Specifies the scale.
`protected Hashtable<Object,mxCellState>` | `states` Maps from cells to cell states.
`protected mxPoint` | `translate` Point that specifies the current translation.

Fields inherited from class com.mxgraph.util.mxEventSource
`eventListeners, eventsEnabled, eventSource`

Constructor Summary
`mxGraphView(mxGraph graph)` Constructs a new view for the given graph.

Method Summary
`protected void` | `childMoved(mxCellState parent, mxCellState child)` Invoked when a child state was moved as a result of late evaluation of its position.
`void` | `clear(Object cell, boolean force, boolean recurse)` Removes the state of the given cell and all descendants if the given cell is not the current root.
`mxCellState` | `createState(Object cell)` Creates and returns a cell state for the given cell.
`mxRectangle` | `getBoundingBox(Object[] cells)` Returns the bounding box for an array of cells or null, if no cells are specified.
`mxRectangle` | `getBounds(Object[] cells)` Returns the bounding box for an array of cells or null, if no cells are specified.
`mxRectangle` | `getBounds(Object[] cells, boolean boundingBox)` Returns the bounding box for an array of cells or null, if no cells are specified.
`mxCellState[]` | `getCellStates(Object[] cells)` Returns the states for the given array of cells.
`Object` | `getCurrentRoot()` Returns the current root.
`mxEdgeStyle.mxEdgeStyleFunction` | `getEdgeStyle(mxCellState edge, List<mxPoint> points, Object source, Object target)` Returns the edge style function to be used to compute the absolute points for the given state, control points and terminals.
`mxGraph` | `getGraph()` Returns the enclosing graph.
`mxRectangle` | `getGraphBounds()` Returns the cached diagram bounds.
`mxPoint` | `getNextPoint(mxCellState edge, mxCellState opposite, boolean source)` Returns the nearest point in the list of absolute points or the center of the opposite terminal.
`mxRectangle` | `getPerimeterBounds(mxCellState terminal, double border)` Returns the perimeter bounds for the given terminal, edge pair.
`mxPerimeter.mxPerimeterFunction` | `getPerimeterFunction(mxCellState state)` Returns the perimeter function for the given state.
`mxPoint` | `getPerimeterPoint(mxCellState terminal, mxPoint next, boolean orthogonal)` Returns a point that defines the location of the intersection point between the perimeter and the line between the center of the shape and the given point.
`mxPoint` | `getPerimeterPoint(mxCellState terminal, mxPoint next, boolean orthogonal, double border)` Returns a point that defines the location of the intersection point between the perimeter and the line between the center of the shape and the given point.
`mxPoint` | `getPoint(mxCellState state)` Returns the absolute center point along the given edge.
`mxPoint` | `getPoint(mxCellState state, mxGeometry geometry)` Returns the absolute point on the edge for the given relative geometry as a point.
`mxPoint` | `getRelativePoint(mxCellState edgeState, double x, double y)` Gets the relative point that describes the given, absolute label position for the given edge state.
`double` | `getRoutingCenterX(mxCellState state)` Returns the x-coordinate of the center point for automatic routing.
`double` | `getRoutingCenterY(mxCellState state)` Returns the y-coordinate of the center point for automatic routing.
`double` | `getScale()` Returns the current scale.
`mxCellState` | `getState(Object cell)` Returns the state for the given cell or null if no state is defined for the cell.
`mxCellState` | `getState(Object cell, boolean create)` Returns the cell state for the given cell.
`Hashtable<Object,mxCellState>` | `getStates()` Returns the dictionary that maps from cells to states.
`mxCellState` | `getTerminalPort(mxCellState state, mxCellState terminal, boolean source)` Returns a cell state that represents the source or target terminal or port for the given edge.
`mxPoint` | `getTranslate()` Returns the current translation.
`Object` | `getVisibleTerminal(Object edge, boolean source)` Returns the nearest ancestor terminal that is visible.
`void` | `invalidate()` Invalidates all cell states.
`void` | `invalidate(Object cell)` Invalidates the state of the given cell, all its descendants and connected edges.
`void` | `reload()` Removes all existing cell states and invokes validate.
`mxCellState` | `removeState(Object cell)` Removes and returns the mxCellState for the given cell.
`void` | `revalidate()`
`void` | `scaleAndTranslate(double scale, double dx, double dy)` Sets the scale and translation.
`Object` | `setCurrentRoot(Object root)` Sets and returns the current root and fires an undo event.
`void` | `setGraphBounds(mxRectangle value)` Sets the graph bounds.
`void` | `setScale(double value)` Sets the current scale and revalidates the view.
`void` | `setStates(Hashtable<Object,mxCellState> states)` Returns the dictionary that maps from cells to states.
`void` | `setTranslate(mxPoint value)` Sets the current translation and invalidates the view.
`mxPoint` | `transformControlPoint(mxCellState state, mxPoint pt)` Transforms the given control point to an absolute point.
`mxRectangle` | `updateBoundingBox(mxCellState state)` Updates the bounding box in the given cell state.
`void` | `updateEdgeBounds(mxCellState state)` Updates the given state using the bounding box of the absolute points.
`void` | `updateFixedTerminalPoint(mxCellState edge, mxCellState terminal, boolean source, mxConnectionConstraint constraint)` Sets the fixed source or target terminal point on the given edge.
`void` | `updateFixedTerminalPoints(mxCellState edge, mxCellState source, mxCellState target)` Sets the initial absolute terminal points in the given state before the edge style is computed.
`void` | `updateFloatingTerminalPoint(mxCellState edge, mxCellState start, mxCellState end, boolean source)` Updates the absolute terminal point in the given state for the given start and end state, where start is the source if source is true.
`void` | `updateFloatingTerminalPoints(mxCellState state, mxCellState source, mxCellState target)` Updates the terminal points in the given state after the edge style was computed for the edge.
`void` | `updateLabelBounds(mxCellState state)` Updates the label bounds in the given state.
`void` | `updatePoints(mxCellState edge, List<mxPoint> points, mxCellState source, mxCellState target)` Updates the absolute points in the given state using the specified array of points as the relative points.
`void` | `updateVertexLabelOffset(mxCellState state)` Updates the absoluteOffset of the given vertex cell state.
`void` | `validate()` First validates all bounds and then validates all points recursively on all visible cells.
`void` | `validateBounds(mxCellState parentState, Object cell)` Validates the bounds of the given parent's child using the given parent state as the origin for the child.
`mxRectangle` | `validatePoints(mxCellState parentState, Object cell)` Validates the points for the state of the given cell recursively if the cell is not collapsed and returns the bounding box of all visited states as a rectangle.

Methods inherited from class com.mxgraph.util.mxEventSource
`addListener, fireEvent, fireEvent, getEventSource, isEventsEnabled, removeListener, removeListener, setEventsEnabled, setEventSource`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### graph

    protected mxGraph graph

  Reference to the enclosing graph.

### currentRoot

    protected Object currentRoot

  mxCell that acts as the root of the displayed cell hierarchy.

### graphBounds

    protected mxRectangle graphBounds

  Caches the current bounds of the graph.

### scale

    protected double scale

  Specifies the scale. Default is 1 (100%).

### translate

    protected mxPoint translate

  Point that specifies the current translation. Default is a new empty point.

### states

    protected Hashtable<Object,mxCellState> states

  Maps from cells to cell states.

Constructor Detail

### mxGraphView

    public mxGraphView(mxGraph graph)

  Constructs a new view for the given graph.

  Parameters:
    `graph` - Reference to the enclosing graph.

Method Detail

### getGraph

    public mxGraph getGraph()

  Returns the enclosing graph.

  Returns:
    Returns the enclosing graph.

### getStates

    public Hashtable<Object,mxCellState> getStates()

  Returns the dictionary that maps from cells to states.

### setStates

    public void setStates(Hashtable<Object,mxCellState> states)

  Returns the dictionary that maps from cells to states.

### getGraphBounds

    public mxRectangle getGraphBounds()

  Returns the cached diagram bounds.

  Returns:
    Returns the diagram bounds.

### setGraphBounds

    public void setGraphBounds(mxRectangle value)

  Sets the graph bounds.

### getCurrentRoot

    public Object getCurrentRoot()

  Returns the current root.

### setCurrentRoot

    public Object setCurrentRoot(Object root)

  Sets and returns the current root and fires an undo event.

  Parameters:
    `root` - mxCell that specifies the root of the displayed cell hierarchy.
  Returns:
    Returns the object that represents the current root.

### scaleAndTranslate

    public void scaleAndTranslate(double scale,
                                  double dx,
                                  double dy)

  Sets the scale and translation. Fires a "scaleAndTranslate" event after calling revalidate. Revalidate is only called if isEventsEnabled.

  Parameters:
    `scale` - Decimal value that specifies the new scale (1 is 100%).
    `dx` - X-coordinate of the translation.
    `dy` - Y-coordinate of the translation.

### getScale

    public double getScale()

  Returns the current scale.

  Returns:
    Returns the scale.

### setScale

    public void setScale(double value)

  Sets the current scale and revalidates the view. Fires a "scale" event after calling revalidate. Revalidate is only called if isEventsEnabled.

  Parameters:
    `value` - New scale to be used.

### getTranslate

    public mxPoint getTranslate()

  Returns the current translation.

  Returns:
    Returns the translation.

### setTranslate

    public void setTranslate(mxPoint value)

  Sets the current translation and invalidates the view. Fires a property change event for "translate" after calling revalidate. Revalidate is only called if isEventsEnabled.

  Parameters:
    `value` - New translation to be used.

### getBounds

    public mxRectangle getBounds(Object[] cells)

  Returns the bounding box for an array of cells or null, if no cells are specified.

  Parameters:
    `cells` -
  Returns:
    Returns the bounding box for the given cells.

### getBoundingBox

    public mxRectangle getBoundingBox(Object[] cells)

  Returns the bounding box for an array of cells or null, if no cells are specified.

  Parameters:
    `cells` -
  Returns:
    Returns the bounding box for the given cells.

### getBounds

    public mxRectangle getBounds(Object[] cells,
                                 boolean boundingBox)

  Returns the bounding box for an array of cells or null, if no cells are specified.

  Parameters:
    `cells` -
  Returns:
    Returns the bounding box for the given cells.

### reload

    public void reload()

  Removes all existing cell states and invokes validate.

### revalidate

    public void revalidate()

### invalidate

    public void invalidate()

  Invalidates all cell states.

### clear

    public void clear(Object cell,
                      boolean force,
                      boolean recurse)

  Removes the state of the given cell and all descendants if the given cell is not the current root.

  Parameters:
    `cell` -
    `force` -
    `recurse` -

### invalidate

    public void invalidate(Object cell)

  Invalidates the state of the given cell, all its descendants and connected edges.

### validate

    public void validate()

  First validates all bounds and then validates all points recursively on all visible cells.

### validateBounds

    public void validateBounds(mxCellState parentState,
                               Object cell)

  Validates the bounds of the given parent's child using the given parent state as the origin for the child. The validation is carried out recursively for all non-collapsed descendants.

  Parameters:
    `parentState` - Object that represents the state of the parent cell.
    `cell` - Cell for which the bounds in the state should be updated.

### updateVertexLabelOffset

    public void updateVertexLabelOffset(mxCellState state)

  Updates the absoluteOffset of the given vertex cell state. This takes into account the label position styles.

  Parameters:
    `state` - Cell state whose absolute offset should be updated.

### validatePoints

    public mxRectangle validatePoints(mxCellState parentState,
                                      Object cell)

  Validates the points for the state of the given cell recursively if the cell is not collapsed and returns the bounding box of all visited states as a rectangle.

  Parameters:
    `parentState` - Object that represents the state of the parent cell.
    `cell` - Cell for which the points in the state should be updated.
  Returns:
    Returns the bounding box for the given cell.

### childMoved

    protected void childMoved(mxCellState parent,
                              mxCellState child)

  Invoked when a child state was moved as a result of late evaluation of its position. This is invoked for relative edge children whose position can only be determined after the points of the parent edge are updated in validatePoints, and validates the bounds of all descendants of the child using validateBounds.

### updateLabelBounds

    public void updateLabelBounds(mxCellState state)

  Updates the label bounds in the given state.

### updateBoundingBox

    public mxRectangle updateBoundingBox(mxCellState state)

  Updates the bounding box in the given cell state.

  Parameters:
    `state` - Cell state whose bounding box should be updated.

### updateFixedTerminalPoints

    public void updateFixedTerminalPoints(mxCellState edge,
                                          mxCellState source,
                                          mxCellState target)

  Sets the initial absolute terminal points in the given state before the edge style is computed.

  Parameters:
    `edge` - Cell state whose initial terminal points should be updated.
    `source` - Cell state which represents the source terminal.
    `target` - Cell state which represents the target terminal.

### updateFixedTerminalPoint

    public void updateFixedTerminalPoint(mxCellState edge,
                                         mxCellState terminal,
                                         boolean source,
                                         mxConnectionConstraint constraint)

  Sets the fixed source or target terminal point on the given edge.

  Parameters:
    `edge` - Cell state whose initial terminal points should be updated.

### updatePoints

    public void updatePoints(mxCellState edge,
                             List<mxPoint> points,
                             mxCellState source,
                             mxCellState target)

  Updates the absolute points in the given state using the specified array of points as the relative points.

  Parameters:
    `edge` - Cell state whose absolute points should be updated.
    `points` - Array of points that constitute the relative points.
    `source` - Cell state that represents the source terminal.
    `target` - Cell state that represents the target terminal.

### transformControlPoint

    public mxPoint transformControlPoint(mxCellState state,
                                         mxPoint pt)

  Transforms the given control point to an absolute point.

### getEdgeStyle

    public mxEdgeStyle.mxEdgeStyleFunction getEdgeStyle(mxCellState edge,
                                                        List<mxPoint> points,
                                                        Object source,
                                                        Object target)

  Returns the edge style function to be used to compute the absolute points for the given state, control points and terminals.

### updateFloatingTerminalPoints

    public void updateFloatingTerminalPoints(mxCellState state,
                                             mxCellState source,
                                             mxCellState target)

  Updates the terminal points in the given state after the edge style was computed for the edge.

  Parameters:
    `state` - Cell state whose terminal points should be updated.
    `source` - Cell state that represents the source terminal.
    `target` - Cell state that represents the target terminal.

### updateFloatingTerminalPoint

    public void updateFloatingTerminalPoint(mxCellState edge,
                                            mxCellState start,
                                            mxCellState end,
                                            boolean source)

  Updates the absolute terminal point in the given state for the given start and end state, where start is the source if source is true.

  Parameters:
    `edge` - Cell state whose terminal point should be updated.
    `start` - Cell state for the terminal on "this" side of the edge.
    `end` - Cell state for the terminal on the other side of the edge.
    `source` - Boolean indicating if start is the source terminal state.

### getTerminalPort

    public mxCellState getTerminalPort(mxCellState state,
                                       mxCellState terminal,
                                       boolean source)

  Returns a cell state that represents the source or target terminal or port for the given edge.

### getPerimeterPoint

    public mxPoint getPerimeterPoint(mxCellState terminal,
                                     mxPoint next,
                                     boolean orthogonal)

  Returns a point that defines the location of the intersection point between the perimeter and the line between the center of the shape and the given point.

### getPerimeterPoint

    public mxPoint getPerimeterPoint(mxCellState terminal,
                                     mxPoint next,
                                     boolean orthogonal,
                                     double border)

  Returns a point that defines the location of the intersection point between the perimeter and the line between the center of the shape and the given point.

  Parameters:
    `terminal` - Cell state for the source or target terminal.
    `next` - Point that lies outside of the given terminal.
    `orthogonal` - Boolean that specifies if the orthogonal projection onto the perimeter should be returned. If this is false then the intersection of the perimeter and the line between the next and the center point is returned.
    `border` - Optional border between the perimeter and the shape.

### getRoutingCenterX

    public double getRoutingCenterX(mxCellState state)

  Returns the x-coordinate of the center point for automatic routing.

  Returns:
    Returns the x-coordinate of the routing center point.

### getRoutingCenterY

    public double getRoutingCenterY(mxCellState state)

  Returns the y-coordinate of the center point for automatic routing.

  Returns:
    Returns the y-coordinate of the routing center point.

### getPerimeterBounds

    public mxRectangle getPerimeterBounds(mxCellState terminal,
                                          double border)

  Returns the perimeter bounds for the given terminal, edge pair.

### getPerimeterFunction

    public mxPerimeter.mxPerimeterFunction getPerimeterFunction(mxCellState state)

  Returns the perimeter function for the given state.

### getNextPoint

    public mxPoint getNextPoint(mxCellState edge,
                                mxCellState opposite,
                                boolean source)

  Returns the nearest point in the list of absolute points or the center of the opposite terminal.

  Parameters:
    `edge` - Cell state that represents the edge.
    `opposite` - Cell state that represents the opposite terminal.
    `source` - Boolean indicating if the next point for the source or target should be returned.
  Returns:
    Returns the nearest point of the opposite side.

### getVisibleTerminal

    public Object getVisibleTerminal(Object edge,
                                     boolean source)

  Returns the nearest ancestor terminal that is visible. The edge appears to be connected to this terminal on the display.

  Parameters:
    `edge` - Cell whose visible terminal should be returned.
    `source` - Boolean that specifies if the source or target terminal should be returned.
  Returns:
    Returns the visible source or target terminal.

### updateEdgeBounds

    public void updateEdgeBounds(mxCellState state)

  Updates the given state using the bounding box of the absolute points. Also updates terminal distance, length and segments.

  Parameters:
    `state` - Cell state whose bounds should be updated.

### getPoint

    public mxPoint getPoint(mxCellState state)

  Returns the absolute center point along the given edge.

### getPoint

    public mxPoint getPoint(mxCellState state,
                            mxGeometry geometry)

  Returns the absolute point on the edge for the given relative geometry as a point. The edge is represented by the given cell state.

  Parameters:
    `state` - Represents the state of the parent edge.
    `geometry` - Optional geometry that represents the relative location.
  Returns:
    Returns the mxpoint that represents the absolute location of the given relative geometry.

### getRelativePoint

    public mxPoint getRelativePoint(mxCellState edgeState,
                                    double x,
                                    double y)

  Gets the relative point that describes the given, absolute label position for the given edge state.

### getCellStates

    public mxCellState[] getCellStates(Object[] cells)

  Returns the states for the given array of cells. The array contains all states that are not null, that is, the returned array may have less elements than the given array.

### getState

    public mxCellState getState(Object cell)

  Returns the state for the given cell or null if no state is defined for the cell.

  Parameters:
    `cell` - Cell whose state should be returned.
  Returns:
    Returns the state for the given cell.

### getState

    public mxCellState getState(Object cell,
                                boolean create)

  Returns the cell state for the given cell. If create is true, then the state is created if it does not yet exist.

  Parameters:
    `cell` - Cell for which a new state should be returned.
    `create` - Boolean indicating if a new state should be created if it does not yet exist.
  Returns:
    Returns the state for the given cell.

### removeState

    public mxCellState removeState(Object cell)

  Removes and returns the mxCellState for the given cell.

  Parameters:
    `cell` - mxCell for which the mxCellState should be removed.
  Returns:
    Returns the mxCellState that has been removed.

### createState

    public mxCellState createState(Object cell)

  Creates and returns a cell state for the given cell.

  Parameters:
    `cell` - Cell for which a new state should be created.
  Returns:
    Returns a new state for the given cell.

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Copyright (c) 2010 Gaudenz Alder. All rights reserved.