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Java™ Platform Standard Ed. 6 |
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java.lang.Object extended by java.awt.FlowLayout
public class FlowLayout
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
align
property. The possible values are:
For example, the following picture shows an applet using the flow layout manager (its default layout manager) to position three buttons:
Graphic of Layout for 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.
ComponentOrientation
,
Serialized Form
Field Summary | |
---|---|
static int |
CENTER
This value indicates that each row of components should be centered. |
static 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. |
static int |
LEFT
This value indicates that each row of components should be left-justified. |
static int |
RIGHT
This value indicates that each row of components should be right-justified. |
static 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. |
Constructor Summary | |
---|---|
FlowLayout()
Constructs a new FlowLayout with a centered alignment and a
default 5-unit horizontal and vertical gap. |
|
FlowLayout(int align)
Constructs a new FlowLayout with the specified
alignment and a default 5-unit horizontal and vertical gap. |
|
FlowLayout(int align,
int hgap,
int vgap)
Creates a new flow layout manager with the indicated alignment and the indicated horizontal and vertical gaps. |
Method Summary | |
---|---|
void |
addLayoutComponent(String name,
Component comp)
Adds the specified component to the layout. |
int |
getAlignment()
Gets the alignment for this layout. |
boolean |
getAlignOnBaseline()
Returns true if components are to be vertically aligned along their baseline. |
int |
getHgap()
Gets the horizontal gap between components and between the components and the borders of the Container |
int |
getVgap()
Gets the vertical gap between components and between the components and the borders of the Container . |
void |
layoutContainer(Container target)
Lays out the container. |
Dimension |
minimumLayoutSize(Container target)
Returns the minimum dimensions needed to layout the visible components contained in the specified target container. |
Dimension |
preferredLayoutSize(Container target)
Returns the preferred dimensions for this layout given the visible components in the specified target container. |
void |
removeLayoutComponent(Component comp)
Removes the specified component from the layout. |
void |
setAlignment(int align)
Sets the alignment for this layout. |
void |
setAlignOnBaseline(boolean alignOnBaseline)
Sets whether or not components should be vertically aligned along their baseline. |
void |
setHgap(int hgap)
Sets the horizontal gap between components and between the components and the borders of the Container . |
void |
setVgap(int vgap)
Sets the vertical gap between components and between the components and the borders of the Container . |
String |
toString()
Returns a string representation of this FlowLayout
object and its values. |
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Field Detail |
---|
public static final int LEFT
public static final int CENTER
public static final int RIGHT
public static final int LEADING
Component.getComponentOrientation()
,
ComponentOrientation
,
Constant Field Valuespublic static final int TRAILING
Component.getComponentOrientation()
,
ComponentOrientation
,
Constant Field ValuesConstructor Detail |
---|
public FlowLayout()
FlowLayout
with a centered alignment and a
default 5-unit horizontal and vertical gap.
public FlowLayout(int align)
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
.
align
- the alignment valuepublic FlowLayout(int align, int hgap, int vgap)
The value of the alignment argument must be one of
FlowLayout.LEFT
, FlowLayout.RIGHT
,
FlowLayout.CENTER
, FlowLayout.LEADING
,
or FlowLayout.TRAILING
.
align
- the alignment valuehgap
- 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
Method Detail |
---|
public int getAlignment()
FlowLayout.LEFT
,
FlowLayout.RIGHT
, FlowLayout.CENTER
,
FlowLayout.LEADING
,
or FlowLayout.TRAILING
.
setAlignment(int)
public void setAlignment(int align)
FlowLayout.LEFT
FlowLayout.RIGHT
FlowLayout.CENTER
FlowLayout.LEADING
FlowLayout.TRAILING
align
- one of the alignment values shown abovegetAlignment()
public int getHgap()
Container
Container
setHgap(int)
public void setHgap(int hgap)
Container
.
hgap
- the horizontal gap between components
and between the components and the borders
of the Container
getHgap()
public int getVgap()
Container
.
Container
setVgap(int)
public void setVgap(int vgap)
Container
.
vgap
- the vertical gap between components
and between the components and the borders
of the Container
getVgap()
public void setAlignOnBaseline(boolean alignOnBaseline)
alignOnBaseline
- whether or not components should be
vertically aligned on their baselinepublic boolean getAlignOnBaseline()
public void addLayoutComponent(String name, Component comp)
addLayoutComponent
in interface LayoutManager
name
- the name of the componentcomp
- the component to be addedpublic void removeLayoutComponent(Component comp)
removeLayoutComponent
in interface LayoutManager
comp
- the component to removeContainer.removeAll()
public Dimension preferredLayoutSize(Container target)
preferredLayoutSize
in interface LayoutManager
target
- the container that needs to be laid out
Container
,
minimumLayoutSize(java.awt.Container)
,
Container.getPreferredSize()
public Dimension minimumLayoutSize(Container target)
minimumLayoutSize
in interface LayoutManager
target
- the container that needs to be laid out
preferredLayoutSize(java.awt.Container)
,
Container
,
Container.doLayout()
public void layoutContainer(Container target)
FlowLayout
object.
layoutContainer
in interface LayoutManager
target
- the specified component being laid outContainer
,
Container.doLayout()
public String toString()
FlowLayout
object and its values.
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Java™ Platform Standard Ed. 6 |
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