Java javax.swing Class JRootPane.RootLayout（JDK8）

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Java™ Platform
Standard Ed. 8

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java.lang.Object
- javax.swing.JRootPane.RootLayout

All Implemented Interfaces:

LayoutManager, LayoutManager2, Serializable

Enclosing class:

JRootPane
```
protected class JRootPane.RootLayout
extends Object
implements LayoutManager2, Serializable
```
A custom layout manager that is responsible for the layout of layeredPane, glassPane, and menuBar.
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

Modifier Constructor and Description

protected RootLayout()

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)` If the layout manager uses a per-component string, adds the component `comp` to the layout, associating it with the string specified by `name`.
`float`	`getLayoutAlignmentX(Container target)` Returns the alignment along the x axis.
`float`	`getLayoutAlignmentY(Container target)` Returns the alignment along the y axis.
`void`	`invalidateLayout(Container target)` Invalidates the layout, indicating that if the layout manager has cached information it should be discarded.
`void`	`layoutContainer(Container parent)` Instructs the layout manager to perform the layout for the specified container.
`Dimension`	`maximumLayoutSize(Container target)` Returns the maximum amount of space the layout can use.
`Dimension`	`minimumLayoutSize(Container parent)` Returns the minimum amount of space the layout needs.
`Dimension`	`preferredLayoutSize(Container parent)` Returns the amount of space the layout would like to have.
`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
  - RootLayout
```
protected RootLayout()
```
- Method Detail
  - preferredLayoutSize
```
public Dimension preferredLayoutSize(Container parent)
```
    Returns the amount of space the layout would like to have.
    
    Specified by:
    
    preferredLayoutSize in interface LayoutManager
    
    Parameters:
    
    parent - the Container for which this layout manager is being used
    
    Returns:
    
    a Dimension object containing the layout's preferred size
    
    See Also:
    
    LayoutManager.minimumLayoutSize(java.awt.Container)
  - minimumLayoutSize
```
public Dimension minimumLayoutSize(Container parent)
```
    Returns the minimum amount of space the layout needs.
    
    Specified by:
    
    minimumLayoutSize in interface LayoutManager
    
    Parameters:
    
    parent - the Container for which this layout manager is being used
    
    Returns:
    
    a Dimension object containing the layout's minimum size
    
    See Also:
    
    LayoutManager.preferredLayoutSize(java.awt.Container)
  - maximumLayoutSize
```
public Dimension maximumLayoutSize(Container target)
```
    Returns the maximum amount of space the layout can use.
    
    Specified by:
    
    maximumLayoutSize in interface LayoutManager2
    
    Parameters:
    
    target - the Container for which this layout manager is being used
    
    Returns:
    
    a Dimension object containing the layout's maximum size
    
    See Also:
    
    Component.getMaximumSize(), LayoutManager
  - layoutContainer
```
public void layoutContainer(Container parent)
```
    Instructs the layout manager to perform the layout for the specified container.
    
    Specified by:
    
    layoutContainer in interface LayoutManager
    
    Parameters:
    
    parent - the Container for which this layout manager is being used
  - addLayoutComponent
```
public void addLayoutComponent(String name,
                               Component comp)
```
    Description copied from interface: LayoutManager
    
    If the layout manager uses a per-component string, adds the component comp to the layout, associating it with the string specified by name.
    
    Specified by:
    
    addLayoutComponent in interface LayoutManager
    
    Parameters:
    
    name - the string to be associated with the component
    
    comp - the component to be added
  - removeLayoutComponent
```
public void removeLayoutComponent(Component comp)
```
    Description copied from interface: LayoutManager
    
    Removes the specified component from the layout.
    
    Specified by:
    
    removeLayoutComponent in interface LayoutManager
    
    Parameters:
    
    comp - the component to be removed
  - addLayoutComponent
```
public void addLayoutComponent(Component comp,
                               Object constraints)
```
    Description copied from interface: LayoutManager2
    
    Adds the specified component to the layout, using the specified constraint object.
    
    Specified by:
    
    addLayoutComponent in interface LayoutManager2
    
    Parameters:
    
    comp - the component to be added
    
    constraints - where/how the component is added to the layout.
  - getLayoutAlignmentX
```
public float getLayoutAlignmentX(Container target)
```
    Description copied from interface: LayoutManager2
    
    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.
    
    Specified by:
    
    getLayoutAlignmentX in interface LayoutManager2
  - getLayoutAlignmentY
```
public float getLayoutAlignmentY(Container target)
```
    Description copied from interface: LayoutManager2
    
    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.
    
    Specified by:
    
    getLayoutAlignmentY in interface LayoutManager2
  - invalidateLayout
```
public void invalidateLayout(Container target)
```
    Description copied from interface: LayoutManager2
    
    Invalidates the layout, indicating that if the layout manager has cached information it should be discarded.
    
    Specified by:
    
    invalidateLayout in interface LayoutManager2

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Java javax.swing Class JRootPane.RootLayout（JDK8）

Class JRootPane.RootLayout

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

RootLayout

Method Detail

preferredLayoutSize

minimumLayoutSize

maximumLayoutSize

layoutContainer

addLayoutComponent

removeLayoutComponent

addLayoutComponent

getLayoutAlignmentX

getLayoutAlignmentY

invalidateLayout