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Class java.awt.FlowLayout

java.lang.Object
|
   +----java.awt.FlowLayout

public class FlowLayout

extends Object

implements LayoutManager, Serializable

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.

CENTER

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

LEFT

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

RIGHT

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

FlowLayout()

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

FlowLayout(int)

Constructs a new Flow Layout with the specified alignment and a default 5-unit horizontal and vertical gap.

FlowLayout(int, int, int)

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

addLayoutComponent(String, Component)

Adds the specified component to the layout.

getAlignment()

Gets the alignment for this layout.

getHgap()

Gets the horizontal gap between components.

getVgap()

Gets the vertical gap between components.

layoutContainer(Container)

Lays out the container.

minimumLayoutSize(Container)

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

preferredLayoutSize(Container)

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

removeLayoutComponent(Component)

Removes the specified component from the layout.

setAlignment(int)

Sets the alignment for this layout.

setHgap(int)

Sets the horizontal gap between components.

setVgap(int)

Sets the vertical gap between components.

toString()

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

public static final int LEFT

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

public static final int CENTER

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

public static final int RIGHT

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

public FlowLayout()

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

public FlowLayout(int align)

Constructs a new Flow Layout 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, or FlowLayout.CENTER.

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, or FlowLayout.CENTER.

Parameters:

align - the alignment value.

hgap - the horizontal gap between components.

vgap - the vertical gap between components.

public int getAlignment()

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

Returns:

the alignment value for this layout.

See Also:

setAlignment

public void setAlignment(int align)

Sets the alignment for this layout. Possible values are FlowLayout.LEFT, FlowLayout.RIGHT, and FlowLayout.CENTER.

Parameters:

align - the alignment value.

See Also:

getAlignment

public int getHgap()

Gets the horizontal gap between components.

Returns:

the horizontal gap between components.

See Also:

setHgap

public void setHgap(int hgap)

Sets the horizontal gap between components.

Parameters:

hgap - the horizontal gap between components

See Also:

getHgap

public int getVgap()

Gets the vertical gap between components.

Returns:

the vertical gap between components.

See Also:

setVgap

public void setVgap(int vgap)

Sets the vertical gap between components.

Parameters:

vgap - the vertical gap between components

See Also:

getVgap

public void addLayoutComponent(String name,
Component comp)

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

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.

Parameters:

comp - the component to remove

See Also:

removeAll

public Dimension preferredLayoutSize(Container target)

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

Parameters:

target - the component which needs to be laid out

Returns:

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

See Also:

Container, minimumLayoutSize, getPreferredSize

public Dimension minimumLayoutSize(Container target)

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

Parameters:

target - the component which needs to be laid out

Returns:

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

See Also:

preferredLayoutSize, Container, doLayout

public void layoutContainer(Container target)

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

Parameters:

target - the specified component being laid out.

See Also:

Container, doLayout

public String toString()

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

Returns:

a string representation of this layout.

Overrides:

toString in class Object

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