Java javax.swing Class OverlayLayout（JDK8）

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Java™ Platform
Standard Ed. 8

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java.lang.Object
- 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 JavaBeans™ has been added to the java.beans package. Please see XMLEncoder.

Constructor Summary

Constructors
Constructor and Description
`OverlayLayout(Container target)` Constructs a layout manager that performs overlay arrangement of the children.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`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
```
@ConstructorProperties(value="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 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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Java javax.swing Class OverlayLayout（JDK8）

Class OverlayLayout

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

OverlayLayout

Method Detail

getTarget

invalidateLayout

addLayoutComponent

removeLayoutComponent

addLayoutComponent

preferredLayoutSize

minimumLayoutSize

maximumLayoutSize

getLayoutAlignmentX

getLayoutAlignmentY

layoutContainer