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package java.awt;


Defines an interface for classes that know how to layout Containers
based on a layout constraints object.
This interface extends the LayoutManager interface to deal with layouts
explicitly in terms of constraint objects that specify how and where
components should be added to the layout.


This minimal extension to LayoutManager is intended for tool
providers who wish to the creation of constraint-based layouts.
It does not yet provide full, general support for custom
constraint-based layout managers.

Author:     Jonni Kanerva
See Also:
/**
 * Defines an interface for classes that know how to layout Containers
 * based on a layout constraints object.
 *
 * This interface extends the LayoutManager interface to deal with layouts
 * explicitly in terms of constraint objects that specify how and where
 * components should be added to the layout.
 * <p>
 * This minimal extension to LayoutManager is intended for tool
 * providers who wish to the creation of constraint-based layouts.
 * It does not yet provide full, general support for custom
 * constraint-based layout managers.
 *
 * @see LayoutManager
 * @see Container
 *
 * @author      Jonni Kanerva
 */
public interface LayoutManager2 extends LayoutManager {

    
Adds the specified component to the layout, using the specified
constraint object.

Params:
  • comp – the component to be added
  • constraints –  where/how the component is added to the layout.
/**
     * Adds the specified component to the layout, using the specified
     * constraint object.
     * @param comp the component to be added
     * @param constraints  where/how the component is added to the layout.
     */
    void addLayoutComponent(Component comp, Object constraints);

    
Calculates the maximum size dimensions for the specified container,
given the components it contains.

See Also:
/**
     * Calculates the maximum size dimensions for the specified container,
     * given the components it contains.
     * @see java.awt.Component#getMaximumSize
     * @see LayoutManager
     */
    public Dimension maximumLayoutSize(Container target);

    
Returns the alignment along the x axis.  This specifies how
the component would like to be aligned relative to other
components.  The value should be a number between 0 and 1
where 0 represents alignment along the origin, 1 is aligned
the furthest away from the origin, 0.5 is centered, etc.

/**
     * Returns the alignment along the x axis.  This specifies how
     * the component would like to be aligned relative to other
     * components.  The value should be a number between 0 and 1
     * where 0 represents alignment along the origin, 1 is aligned
     * the furthest away from the origin, 0.5 is centered, etc.
     */
    public float getLayoutAlignmentX(Container target);

    
Returns the alignment along the y axis.  This specifies how
the component would like to be aligned relative to other
components.  The value should be a number between 0 and 1
where 0 represents alignment along the origin, 1 is aligned
the furthest away from the origin, 0.5 is centered, etc.

/**
     * Returns the alignment along the y axis.  This specifies how
     * the component would like to be aligned relative to other
     * components.  The value should be a number between 0 and 1
     * where 0 represents alignment along the origin, 1 is aligned
     * the furthest away from the origin, 0.5 is centered, etc.
     */
    public float getLayoutAlignmentY(Container target);

    
Invalidates the layout, indicating that if the layout manager
has cached information it should be discarded.

/**
     * Invalidates the layout, indicating that if the layout manager
     * has cached information it should be discarded.
     */
    public void invalidateLayout(Container target);

}