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Showing content from http://java.sun.com/j2se/1.5/docs/api/java/util/../../java/util/../../java/awt/FlowLayout.html below:

FlowLayout (Java 2 Platform SE 5.0)

java.lang.Object
  java.awt.FlowLayout

All Implemented Interfaces:

LayoutManager, Serializable

public class FlowLayout
extends Object
implements LayoutManager, Serializable

A flow layout arranges components in a directional flow, much like lines of text in a paragraph. The flow direction is determined by the container's componentOrientation property and may be one of two values:

• ComponentOrientation.LEFT_TO_RIGHT
• ComponentOrientation.RIGHT_TO_LEFT

• LEFT
• RIGHT
• CENTER
• LEADING
• TRAILING

For example, the following picture shows an applet using the flow layout manager (its default layout manager) to position three buttons:

Here is the code for this applet:

 import java.awt.*;
 import java.applet.Applet;

 public class myButtons extends Applet {
     Button button1, button2, button3;
     public void init() {
         button1 = new Button("Ok");
         button2 = new Button("Open");
         button3 = new Button("Close");
         add(button1);
         add(button2);
         add(button3);
     }
 }
 

A flow layout lets each component assume its natural (preferred) size.

Since:

JDK1.0

See Also:

ComponentOrientation, Serialized Form

public static final int LEFT

This value indicates that each row of components should be left-justified.

See Also:

Constant Field Values

public static final int CENTER

This value indicates that each row of components should be centered.

See Also:

Constant Field Values

public static final int RIGHT

This value indicates that each row of components should be right-justified.

See Also:

Constant Field Values

public static final int LEADING

This value indicates that each row of components should be justified to the leading edge of the container's orientation, for example, to the left in left-to-right orientations.

Since:

1.2 Package-private pending API change approval

See Also:

Component.getComponentOrientation(), ComponentOrientation, Constant Field Values

public static final int TRAILING

This value indicates that each row of components should be justified to the trailing edge of the container's orientation, for example, to the right in left-to-right orientations.

Since:

1.2 Package-private pending API change approval

See Also:

Component.getComponentOrientation(), ComponentOrientation, Constant Field Values

public FlowLayout()

Constructs a new FlowLayout with a centered alignment and a default 5-unit horizontal and vertical gap.

public FlowLayout(int align)

Constructs a new FlowLayout with the specified alignment and a default 5-unit horizontal and vertical gap. The value of the alignment argument must be one of FlowLayout.LEFT, FlowLayout.RIGHT, FlowLayout.CENTER, FlowLayout.LEADING, or FlowLayout.TRAILING.

Parameters:

align - the alignment value

public FlowLayout(int align,
                  int hgap,
                  int vgap)

Creates a new flow layout manager with the indicated alignment and the indicated horizontal and vertical gaps.

The value of the alignment argument must be one of FlowLayout.LEFT, FlowLayout.RIGHT, FlowLayout.CENTER, FlowLayout.LEADING, or FlowLayout.TRAILING.

Parameters:

align - the alignment value

hgap - the horizontal gap between components and between the components and the borders of the Container

vgap - the vertical gap between components and between the components and the borders of the Container

public int getAlignment()

Gets the alignment for this layout. Possible values are FlowLayout.LEFT, FlowLayout.RIGHT, FlowLayout.CENTER, FlowLayout.LEADING, or FlowLayout.TRAILING.

Returns:

the alignment value for this layout

Since:

JDK1.1

See Also:

setAlignment(int)

public void setAlignment(int align)

Sets the alignment for this layout. Possible values are

• FlowLayout.LEFT
• FlowLayout.RIGHT
• FlowLayout.CENTER
• FlowLayout.LEADING
• FlowLayout.TRAILING

Parameters:

align - one of the alignment values shown above

Since:

JDK1.1

See Also:

getAlignment()

public int getHgap()

Gets the horizontal gap between components and between the components and the borders of the Container

Returns:

the horizontal gap between components and between the components and the borders of the Container

Since:

JDK1.1

See Also:

setHgap(int)

public void setHgap(int hgap)

Sets the horizontal gap between components and between the components and the borders of the Container.

Parameters:

hgap - the horizontal gap between components and between the components and the borders of the Container

Since:

JDK1.1

See Also:

getHgap()

public int getVgap()

Gets the vertical gap between components and between the components and the borders of the Container.

Returns:

the vertical gap between components and between the components and the borders of the Container

Since:

JDK1.1

See Also:

setVgap(int)

public void setVgap(int vgap)

Sets the vertical gap between components and between the components and the borders of the Container.

Parameters:

vgap - the vertical gap between components and between the components and the borders of the Container

Since:

JDK1.1

See Also:

getVgap()

public void addLayoutComponent(String name,
                               Component comp)

Adds the specified component to the layout. Not used by this class.

Specified by:

addLayoutComponent in interface LayoutManager

Parameters:

name - the name of the component

comp - the component to be added

public void removeLayoutComponent(Component comp)

Removes the specified component from the layout. Not used by this class.

Specified by:

removeLayoutComponent in interface LayoutManager

Parameters:

comp - the component to remove

See Also:

Container.removeAll()

public Dimension preferredLayoutSize(Container target)

Returns the preferred dimensions for this layout given the visible components in the specified target container.

Specified by:

preferredLayoutSize in interface LayoutManager

Parameters:

target - the container that needs to be laid out

Returns:

the preferred dimensions to lay out the subcomponents of the specified container

See Also:

Container, minimumLayoutSize(java.awt.Container), Container.getPreferredSize()

public Dimension minimumLayoutSize(Container target)

Returns the minimum dimensions needed to layout the visible components contained in the specified target container.

Specified by:

minimumLayoutSize in interface LayoutManager

Parameters:

target - the container that needs to be laid out

Returns:

the minimum dimensions to lay out the subcomponents of the specified container

See Also:

preferredLayoutSize(java.awt.Container), Container, Container.doLayout()

public void layoutContainer(Container target)

Lays out the container. This method lets each visible component take its preferred size by reshaping the components in the target container in order to satisfy the alignment of this FlowLayout object.

Specified by:

layoutContainer in interface LayoutManager

Parameters:

target - the specified component being laid out

See Also:

Container, Container.doLayout()

public String toString()

Returns a string representation of this FlowLayout object and its values.

Overrides:

toString in class Object

Returns:

a string representation of this layout

Copyright © 2004, 2010 Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.

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