org.zaval.lw
Class LwRasterLayout

java.lang.Object
  |
  +--org.zaval.lw.LwRasterLayout

All Implemented Interfaces:

LwLayout

public class LwRasterLayout

extends java.lang.Object

implements LwLayout

This class implements layout manager interface. The layout manager uses original locations (that have been set with setLocation method) and original sizes (that have been set with setSize method) or preferred sizes to layout child components. It is possible to align child components sizes according to the parent component, in this case the child component will be sized to have right bottom corner in the right bottom corner of the parent container.

The layout manager is the same null layout manager in Java AWT library terms if the original sizes are used (layout flag is 0).

Field Summary

static int	H_BY_PARENT Defines child heights alignment by the parent component.
static int	USE_PS_SIZE Defines childs prefered sizes usage as the child sizes.
static int	W_BY_PARENT Defines child widths alignment by the parent component.

Constructor Summary

LwRasterLayout()
Constructs the layout manager that uses child components locations and sizes to layout its.

LwRasterLayout(int f)
Constructs the layout manager with the specified layout flag.

Method Summary

java.awt.Dimension	calcPreferredSize(LayoutContainer c) Calculates the preferred size dimensions for the layout container.
void	componentAdded(java.lang.Object id, Layoutable lw, int index) Invoked when the specified layoutable component is added to the layout container (that uses the layout manager).
void	componentRemoved(Layoutable lw, int index) Invoked when the specified layoutable component is removed from the layout container, that uses the layout manager.
void	layout(LayoutContainer c) Lays out the child layoutable components inside the layout container.

Methods inherited from class java.lang.Object

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

Field Detail

W_BY_PARENT

public static final int W_BY_PARENT

Defines child widths alignment by the parent component.

H_BY_PARENT

public static final int H_BY_PARENT

Defines child heights alignment by the parent component.

USE_PS_SIZE

public static final int USE_PS_SIZE

Defines childs prefered sizes usage as the child sizes.

Constructor Detail

LwRasterLayout

public LwRasterLayout()

Constructs the layout manager that uses child components locations and sizes to layout its. This layout is analog of null layout for Java AWT Library.

LwRasterLayout

public LwRasterLayout(int f)

Constructs the layout manager with the specified layout flag. The flag defines what how the child components should be sized. The following constants (or its combination) can be used as the flag value:

• W_BY_PARENT - to align child components widths by parent size.
• H_BY_PARENT - to align child components heights by parent size.
• USE_PS_SIZE - to use preferred sizes as the child components sizes.

Parameters:

f - the specified layout flag.

Method Detail

componentAdded

public void componentAdded(java.lang.Object id,
                           Layoutable lw,
                           int index)

Invoked when the specified layoutable component is added to the layout container (that uses the layout manager). The specified constraints, layoutable component and child index are passed as arguments into the method.

Specified by:

componentAdded in interface LwLayout

Parameters:

id - the layoutable component constraints.

lw - the layoutable component.

index - the child index.

componentRemoved

public void componentRemoved(Layoutable lw,
                             int index)

Invoked when the specified layoutable component is removed from the layout container, that uses the layout manager.

Specified by:

componentRemoved in interface LwLayout

Parameters:

lw - the layoutable component to be removed

index - the child index.

calcPreferredSize

public java.awt.Dimension calcPreferredSize(LayoutContainer c)

Calculates the preferred size dimensions for the layout container. The method calculates "pure" preferred size, it means that an insets of the container is not considered as a part of the size. The layout manager calculates the preferred size as maximal location of the right bound for a visible child component.

Specified by:

calcPreferredSize in interface LwLayout

Parameters:

c - the layout container.

layout

public void layout(LayoutContainer c)

Lays out the child layoutable components inside the layout container. The layout algorithm just sizes child components if the layout flag indicates to use preferred sizes or align child sizes and moves location of children using an offset that is provided by getLayoutOffset method of the container.

Specified by:

layout in interface LwLayout

Parameters:

c - the layout container that needs to be laid out.