Class JRootPane.RootLayout

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.

Since:

1.2

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	RootLayout()	Constructs a RootLayout.

Method Summary

Modifier and Type	Method	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 declared in class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Modifier and Type	Method	Description
protected Object	clone()	Creates and returns a copy of this object.
boolean	equals(Object obj)	Indicates whether some other object is "equal to" this one.
protected void	finalize()	Deprecated, for removal: This API element is subject to removal in a future version. Finalization is deprecated and subject to removal in a future release.
final Class<?>	getClass()	Returns the runtime class of this Object.
int	hashCode()	Returns a hash code value for this object.
final void	notify()	Wakes up a single thread that is waiting on this object's monitor.
final void	notifyAll()	Wakes up all threads that are waiting on this object's monitor.
String	toString()	Returns a string representation of the object.
final void	wait()	Causes the current thread to wait until it is awakened, typically by being notified or interrupted.
final void	wait(long timeoutMillis)	Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
final void	wait(long timeoutMillis, int nanos)	Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.

Constructor Details

RootLayout

protected RootLayout()

Constructs a RootLayout.

Method Details

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(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(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

Parameters:

target - the target container

Returns:

the x-axis alignment preference

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

Parameters:

target - the target container

Returns:

the y-axis alignment preference

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

Parameters:

target - the target container