Interface java.awt.LayoutManager2 - JDK 5 Documentation v1.1.8, Java 2 SDK 英文文档

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Interface java.awt.LayoutManager2

public interface LayoutManager2
extends LayoutManager

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.

See Also:: LayoutManager, Container

addLayoutComponent(Component, Object): Adds the specified component to the layout, using the specified constraint object.
getLayoutAlignmentX(Container): Returns the alignment along the x axis.
getLayoutAlignmentY(Container): Returns the alignment along the y axis.
invalidateLayout(Container): Invalidates the layout, indicating that if the layout manager has cached information it should be discarded.
maximumLayoutSize(Container): Returns the maximum size of this component.

addLayoutComponent

 public abstract void addLayoutComponent(Component comp,
                                         Object constraints)

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

Parameters:: comp - the component to be added; constraints - where/how the component is added to the layout.

maximumLayoutSize

 public abstract Dimension maximumLayoutSize(Container target)

Returns the maximum size of this component.

See Also:: getMinimumSize, getPreferredSize, LayoutManager

getLayoutAlignmentX

 public abstract float getLayoutAlignmentX(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.

getLayoutAlignmentY

 public abstract float getLayoutAlignmentY(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.

invalidateLayout

 public abstract void invalidateLayout(Container target)

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

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