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Java in a Nutshell

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The java.awt Package

18.37 java.awt.LayoutManager2 (JDK 1.1)

This interface is an extension of the LayoutManager interface. It defines additional layout management methods for layout managers that perform constraint-based layout. GridBagLayout is an example of a constraint-based layout manager--each component added to the layout is associated with a GridBagConstraints object that specifies the "constraints" on how the component is to be laid out.

Java programs do not directly invoke the methods of this interface--they are used by the Container object for which the layout manager is registered.

public abstract interface LayoutManager2 extends LayoutManager {
    // Public Instance Methods
            public abstract void addLayoutComponent(Component comp, Object constraints);
            public abstract float getLayoutAlignmentX(Container target);
            public abstract float getLayoutAlignmentY(Container target);
            public abstract void invalidateLayout(Container target);
            public abstract Dimension maximumLayoutSize(Container target);

Implemented By:

BorderLayout, CardLayout, GridBagLayout

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