Interface LayoutListener

All Known Implementing Classes:
LayoutAnimator, LayoutListener.Stub

public interface LayoutListener
Classes which implement this interface provide callback hooks for various layout related events.

Instances can be hooked to figures by calling IFigure.addLayoutListener(LayoutListener). Listeners will be made aware of various steps of the layout mechanism, and even have the opportunity to prevent normal layout from occurring.

Since:
3.1
  • Nested Class Summary

    Nested Classes
    Modifier and Type
    Interface
    Description
    static class 
    A stub implementation which implements all of the declared methods.
  • Method Summary

    Modifier and Type
    Method
    Description
    void
    invalidate(IFigure container)
    Called when a container has been invalidated.
    boolean
    layout(IFigure container)
    Called prior to layout occurring.
    void
    postLayout(IFigure container)
    Called after layout has occurred.
    void
    remove(IFigure child)
    Called when a child is about to be removed from its parent.
    void
    setConstraint(IFigure child, Object constraint)
    Called when a child's constraint is initialized or updated.
  • Method Details

    • invalidate

      void invalidate(IFigure container)
      Called when a container has been invalidated.
      Parameters:
      container - the invalidated Figure
      Since:
      3.1
    • layout

      boolean layout(IFigure container)
      Called prior to layout occurring. A listener may intercept a layout by returning true. If the layout is intercepted, the container's LayoutManager will not receive a layout call.
      Parameters:
      container - the figure incurring a layout
      Returns:
      true if the layout has been intercepted by the listener
      Since:
      3.1
    • postLayout

      void postLayout(IFigure container)
      Called after layout has occurred.
      Parameters:
      container - the figure incurring a layout
      Since:
      3.1
    • remove

      void remove(IFigure child)
      Called when a child is about to be removed from its parent.
      Parameters:
      child - the child being removed
      Since:
      3.1
    • setConstraint

      void setConstraint(IFigure child, Object constraint)
      Called when a child's constraint is initialized or updated.
      Parameters:
      child - the child being updated
      constraint - the child's new constraint
      Since:
      3.1