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OverlayLayout (Java Platform SE 6) - JDK 5 Documentation v6.0, Java 2 SDK 英文文档

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javax.swing
Class OverlayLayout

java.lang.Object
  extended by 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 JavaBeansTM has been added to the java.beans package. Please see XMLEncoder.

Constructor Summary
OverlayLayout(Container target)
          Constructs a layout manager that performs overlay arrangement of the children.
 
Method Summary
 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.
 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 inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

OverlayLayout

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 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
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For further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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