Module org.jhotdraw8.draw
Package org.jhotdraw8.draw.figure

Class GroupFigure

java.lang.Object
org.jhotdraw8.fxbase.styleable.AbstractStyleablePropertyBean
org.jhotdraw8.draw.figure.AbstractFigure
org.jhotdraw8.draw.figure.AbstractCompositeFigure
org.jhotdraw8.draw.figure.GroupFigure
All Implemented Interfaces:
CompositableFigure, Figure, Grouping, HideableFigure, LockableFigure, ResizableFigure, StyleableFigure, TransformableFigure, TransformCachingFigure, PropertyBean, StyleableBean, StyleablePropertyBean, TreeNode<Figure>
public class GroupFigure extends AbstractCompositeFigure implements Grouping, ResizableFigure, TransformableFigure, HideableFigure, StyleableFigure, LockableFigure, CompositableFigure
A figure which groups child figures, so that they can be edited by the user as a unit.
Author:
Werner Randelshofer

  • Field Details

    • TYPE_SELECTOR

      public static final String TYPE_SELECTOR
      The CSS type selector for a label object is "Group".
      See Also:

  • Constructor Details

    • GroupFigure

      public GroupFigure()

  • Method Details

    • createNode

      public @NonNull javafx.scene.Node createNode(@NonNull RenderContext drawingView)
      Description copied from interface: Figure
      This method is invoked by a RenderContext, when it needs a node to create a JavaFX scene graph for a figure.

      A typical implementation should look like this: 

      
 public Node createNode(@NonNull RenderContext v) {
 return new ...desired subclass of Node...();
 }

      A figure may be rendered with multiple RenderContexts simultaneously. Each RenderContext uses this method to instantiate a JavaFX node for the figure and associate it to the figure.

      This method must create a new instance because returning an already existing instance may cause undesired side effects on other RenderContexts.

      Note that by convention this method may only be invoked by a RenderContext object.

      Specified by:
      createNode in interface Figure
      Parameters:
      drawingView - the renderer which will use the node
      Returns:
      the newly created node

    • getTypeSelector

      public @NonNull String getTypeSelector()
      Specified by:
      getTypeSelector in interface StyleableBean

    • reshapeInLocal

      public void reshapeInLocal(javafx.scene.transform.Transform transform)
      Description copied from interface: Figure
      Attempts to change the local bounds of the figure.

      The figure may choose to only partially change its local bounds.

      Specified by:
      reshapeInLocal in interface Figure
      Specified by:
      reshapeInLocal in interface TransformableFigure
      Parameters:
      transform - the desired transformation in local coordinates

    • reshapeInLocal

      public void reshapeInLocal(@NonNull CssSize x, @NonNull CssSize y, @NonNull CssSize width, @NonNull CssSize height)
      Description copied from interface: Figure
      Attempts to change the local bounds of the figure.

      See {#link #reshapeInLocal(Transform)} for a description of this method.

      This method takes parameters as CssSizes. This can be used to avoid rounding errors when the figure is reshaped in non-pixel units.

      This method can forward a call to Figure.reshapeInLocal(Transform) using the following code: 

      
 void reshapeInLocal(@NonNull CssSize x, @NonNull CssSize y, @NonNull CssSize width, @NonNull CssSize height) {
   Transform tx = Transforms.createReshapeTransform(getCssBoundsInLocal(), x, y, width, height);
   reshapeInLocal(tx);
 }
      Specified by:
      reshapeInLocal in interface Figure
      Parameters:
      x - desired x-position in parent coordinates
      y - desired y-position in parent coordinates
      width - desired width in parent coordinates, may be negative
      height - desired height in parent coordinates, may be negative

    • updateNode

      public void updateNode(@NonNull RenderContext ctx, @NonNull javafx.scene.Node n)
      Description copied from interface: Figure
      This method is invoked by a RenderContext, when it needs to update the node which represents the scene graph in the figure.

      A figure which is composed from child figures, must addChild the nodes of its getChildren to its node. This ensures that coordinate space transformations of the composed figure are properly propagated to its getChildren. 

       public void updateNode(@NonNull RenderContext rc, Node n) {
     ObservableList<Node> group = ((Group) n).getChildren();
 group.clear();
 for (Figure child : children()) {
 group.addChild(rc.getNode(child));
 }

      A figure may be shown in multiple RenderContexts. Each RenderContext uses this method to update the a JavaFX node for the figure.

      Note that the figure must retrieve the JavaFX node from other figures from the render context by invoking rc.getNode(child) rather than creating new nodes using child.createNode(rc). This convention allows to implement a cache in the render context for the Java FX node. Also, render contexts like a drawing view need to associate input events on Java FX nodes to the corresponding figure.

      This figure does not keep track of changes that require node updates. DrawingModel to manage node updates.

      Specified by:
      updateNode in interface Figure
      Parameters:
      ctx - the render context
      n - the node which was created with Figure.createNode(org.jhotdraw8.draw.render.RenderContext)

    • isSuitableParent

      public boolean isSuitableParent(@NonNull Figure newParent)
      Description copied from interface: Figure
      This method returns whether the provided figure is a suitable parent for this figure.
      Specified by:
      isSuitableParent in interface Figure
      Specified by:
      isSuitableParent in interface TreeNode<Figure>
      Parameters:
      newParent - The new parent figure.
      Returns:
      true if newParent is an acceptable parent

    • isSuitableChild

      public boolean isSuitableChild(@NonNull Figure newChild)
      Description copied from interface: Figure
      This method returns whether the provided figure is a suitable child for this figure.
      Specified by:
      isSuitableChild in interface Figure
      Specified by:
      isSuitableChild in interface TreeNode<Figure>
      Parameters:
      newChild - The new child figure.
      Returns:
      true if newChild is an acceptable child