Module java.desktop
Package javax.swing

Class 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
    See Also:
    Serialized Form

    • Constructor Detail

      • 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 Detail

      • 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(java.awt.Container)

      • 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:
        preferredLayoutSize(java.awt.Container)

      • 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:
        preferredLayoutSize(java.awt.Container)

      • 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