edu.neu.ccs.gui
Class CenterLayout

java.lang.Object
  edu.neu.ccs.gui.CenterLayout

All Implemented Interfaces:

LayoutManager, LayoutManager2

public class CenterLayout

extends Object

implements LayoutManager2

Layout that maintains a single component in the absolute center of the parent container.

This class is based on code posted by sapex to a Java Developer Connection forum on 21 June 2000. The JDC forums are available by following the link below.

Since:

1.0

Version:

2.2

See Also:

JDC forums

Field Summary

private Component

c The component to be maintained by this layout.

Constructor Summary

CenterLayout()
Constructs a new center layout.

Method Summary

void	addLayoutComponent(Component component, Object constraints) Adds the given component to the layout by replacing the currently contained component with the given component.
void	addLayoutComponent(String name, Component component) Adds the given component to the layout.
float	getLayoutAlignmentX(Container target) Returns the layout alignment along the x-axis.
float	getLayoutAlignmentY(Container target) Returns the layout alignment along the y-axis.
void	invalidateLayout(Container target) Invalidates the layout.
void	layoutContainer(Container parent) Lays out the parent container by setting the bounds of the component it contains.
Dimension	maximumLayoutSize(Container parent) Returns the maximum size for the parent container given the maximum size of the contained component.
Dimension	minimumLayoutSize(Container parent) Returns the minimum size for the parent container given the minimum size of the contained component.
Dimension	preferredLayoutSize(Container parent) Returns the preferred size for the parent container given the preferred size of the contained component.
void	removeLayoutComponent(Component component) Removes the given component from the layout.

Methods inherited from class java.lang.Object

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

Field Detail

c

private Component c

The component to be maintained by this layout.

Constructor Detail

CenterLayout

public CenterLayout()

Constructs a new center layout.

Method Detail

addLayoutComponent

public void addLayoutComponent(String name,
                               Component component)

Adds the given component to the layout.

Specified by:

addLayoutComponent in interface LayoutManager

Parameters:

name - the name for this component (ignored)

component - the component to be maintained by this layout.

See Also:

addLayoutComponent(Component, Object)

addLayoutComponent

public void addLayoutComponent(Component component,
                               Object constraints)

Adds the given component to the layout by replacing the currently contained component with the given component.

Specified by:

addLayoutComponent in interface LayoutManager2

Parameters:

component - the component to be maintained by this layout.

constraints - the constraints affecting this component in the layout (ignored)

See Also:

addLayoutComponent(String, Component)

removeLayoutComponent

public void removeLayoutComponent(Component component)

Removes the given component from the layout. If the given component is not the one currently maintained by this layout, no change is made.

Specified by:

removeLayoutComponent in interface LayoutManager

Parameters:

component - the component to remove from this layout

minimumLayoutSize

public Dimension minimumLayoutSize(Container parent)

Returns the minimum size for the parent container given the minimum size of the contained component. If the layout does not contain a component, the minimum size is a Dimension with zero width and height.

Specified by:

minimumLayoutSize in interface LayoutManager

Parameters:

parent - the parent container using this layout

preferredLayoutSize

public Dimension preferredLayoutSize(Container parent)

Returns the preferred size for the parent container given the preferred size of the contained component. If the layout does not contain a component, the preferred size is a Dimension with zero width and height.

Specified by:

preferredLayoutSize in interface LayoutManager

Parameters:

parent - the parent container using this layout

maximumLayoutSize

public Dimension maximumLayoutSize(Container parent)

Returns the maximum size for the parent container given the maximum size of the contained component. If the layout does not contain a component, the maximum size is a Dimension with the maximum possible width and height.

Specified by:

maximumLayoutSize in interface LayoutManager2

Parameters:

parent - the parent container using this layout

layoutContainer

public void layoutContainer(Container parent)

Lays out the parent container by setting the bounds of the component it contains.

Specified by:

layoutContainer in interface LayoutManager

Parameters:

parent - the parent container using this layout

getLayoutAlignmentY

public float getLayoutAlignmentY(Container target)

Returns the layout alignment along the y-axis.

Specified by:

getLayoutAlignmentY in interface LayoutManager2

Parameters:

target - the target container for this layout

getLayoutAlignmentX

public float getLayoutAlignmentX(Container target)

Returns the layout alignment along the x-axis.

Specified by:

getLayoutAlignmentX in interface LayoutManager2

Parameters:

target - the target container for this layout

invalidateLayout

public void invalidateLayout(Container target)

Invalidates the layout. This implementation does nothing.

Specified by:

invalidateLayout in interface LayoutManager2

Parameters:

target - the target container for this layout