Class OverlayLayout

java.lang.Object
javax.swing.OverlayLayout
All Implemented Interfaces:
LayoutManager, LayoutManager2, Serializable
public class OverlayLayout extends Object implements LayoutManager2, Serializable
A layout manager to arrange components over the top of each other. The requested size of the container will be the largest requested size of the children, taking alignment needs into consideration. The alignment is based upon what is needed to properly fit the children in the allocation area. The children will be placed such that their alignment points are all on top of each other.

Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeans has been added to the java.beans package. Please see XMLEncoder.

Since:
1.2

  • Constructor Summary

    Constructors
    Constructor
    Description
    OverlayLayout(Container target)
    Constructs a layout manager that performs overlay arrangement of the children.

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    addLayoutComponent(Component comp, Object constraints)
    Adds the specified component to the layout, using the specified constraint object.
    void
    addLayoutComponent(String name, Component comp)
    Adds the specified component to the layout.
    float
    getLayoutAlignmentX(Container target)
    Returns the alignment along the x axis for the container.
    float
    getLayoutAlignmentY(Container target)
    Returns the alignment along the y axis for the container.
    final Container
    getTarget()
    Returns the container that uses this layout manager.
    void
    invalidateLayout(Container target)
    Indicates a child has changed its layout related information, which causes any cached calculations to be flushed.
    void
    layoutContainer(Container target)
    Called by the AWT when the specified container needs to be laid out.
    Dimension
    maximumLayoutSize(Container target)
    Returns the maximum dimensions needed to lay out the components contained in the specified target container.
    Dimension
    minimumLayoutSize(Container target)
    Returns the minimum dimensions needed to lay out the components contained in the specified target container.
    Dimension
    preferredLayoutSize(Container target)
    Returns the preferred dimensions for this layout given the components in the specified target container.
    void
    removeLayoutComponent(Component comp)
    Removes the specified component from the layout.

    Methods declared in class Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    Modifier and Type
    Method
    Description
    protected Object
    clone()
    Answers a new instance of the same class as the receiver, whose slots have been filled in with the values in the slots of the receiver.
    boolean
    equals(Object o)
    Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison.
    protected void
    finalize()
    Deprecated, for removal: This API element is subject to removal in a future version.
    May cause performance issues, deadlocks and hangs.
    final Class<? extends Object>
    getClass()
    Answers the unique instance of java.lang.Class which represents the class of the receiver.
    int
    hashCode()
    Answers an integer hash code for the receiver.
    final void
    notify()
    Causes one thread which is waiting on the receiver to be made ready to run.
    final void
    notifyAll()
    Causes all threads which are waiting on the receiver to be made ready to run.
    String
    toString()
    Answers a string containing a concise, human-readable description of the receiver.
    final void
    wait()
    Causes the thread which sent this message to be made not ready to run pending some change in the receiver (as indicated by notify or notifyAll).
    final void
    wait(long time)
    Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.
    final void
    wait(long time, int frac)
    Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.

  • Constructor Details

    • OverlayLayout

      @ConstructorProperties("target") public OverlayLayout(Container target)
      Constructs a layout manager that performs overlay arrangement of the children. The layout manager created is dedicated to the given container.
      Parameters:
      target - the container to do layout against

  • Method Details

    • getTarget

      public final Container getTarget()
      Returns the container that uses this layout manager.
      Returns:
      the container that uses this layout manager
      Since:
      1.6

    • invalidateLayout

      public void invalidateLayout(Container target)
      Indicates a child has changed its layout related information, which causes any cached calculations to be flushed.
      Specified by:
      invalidateLayout in interface LayoutManager2
      Parameters:
      target - the container

    • addLayoutComponent

      public void addLayoutComponent(String name, Component comp)
      Adds the specified component to the layout. Used by this class to know when to invalidate layout.
      Specified by:
      addLayoutComponent in interface LayoutManager
      Parameters:
      name - the name of the component
      comp - the component to be added

    • removeLayoutComponent

      public void removeLayoutComponent(Component comp)
      Removes the specified component from the layout. Used by this class to know when to invalidate layout.
      Specified by:
      removeLayoutComponent in interface LayoutManager
      Parameters:
      comp - the component to remove

    • addLayoutComponent

      public void addLayoutComponent(Component comp, Object constraints)
      Adds the specified component to the layout, using the specified constraint object. Used by this class to know when to invalidate layout.
      Specified by:
      addLayoutComponent in interface LayoutManager2
      Parameters:
      comp - the component to be added
      constraints - where/how the component is added to the layout.

    • preferredLayoutSize

      public Dimension preferredLayoutSize(Container target)
      Returns the preferred dimensions for this layout given the components in the specified target container. Recomputes the layout if it has been invalidated. Factors in the current inset setting returned by getInsets().
      Specified by:
      preferredLayoutSize in interface LayoutManager
      Parameters:
      target - the component which needs to be laid out
      Returns:
      a Dimension object containing the preferred dimensions
      See Also:

    • minimumLayoutSize

      public Dimension minimumLayoutSize(Container target)
      Returns the minimum dimensions needed to lay out the components contained in the specified target container. Recomputes the layout if it has been invalidated, and factors in the current inset setting.
      Specified by:
      minimumLayoutSize in interface LayoutManager
      Parameters:
      target - the component which needs to be laid out
      Returns:
      a Dimension object containing the minimum dimensions
      See Also:

    • maximumLayoutSize

      public Dimension maximumLayoutSize(Container target)
      Returns the maximum dimensions needed to lay out the components contained in the specified target container. Recomputes the layout if it has been invalidated, and factors in the inset setting returned by getInset.
      Specified by:
      maximumLayoutSize in interface LayoutManager2
      Parameters:
      target - the component that needs to be laid out
      Returns:
      a Dimension object containing the maximum dimensions
      See Also:

    • getLayoutAlignmentX

      public float getLayoutAlignmentX(Container target)
      Returns the alignment along the x axis for the container.
      Specified by:
      getLayoutAlignmentX in interface LayoutManager2
      Parameters:
      target - the container
      Returns:
      the alignment >= 0.0f && <= 1.0f

    • getLayoutAlignmentY

      public float getLayoutAlignmentY(Container target)
      Returns the alignment along the y axis for the container.
      Specified by:
      getLayoutAlignmentY in interface LayoutManager2
      Parameters:
      target - the container
      Returns:
      the alignment >= 0.0f && <= 1.0f

    • layoutContainer

      public void layoutContainer(Container target)
      Called by the AWT when the specified container needs to be laid out.
      Specified by:
      layoutContainer in interface LayoutManager
      Parameters:
      target - the container to lay out
      Throws:
      AWTError - if the target isn't the container specified to the constructor