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java.awt

Class FlowLayout

Implemented Interfaces:
LayoutManager, Serializable
public class FlowLayout
extends Object
implements LayoutManager, Serializable
This class implements a flow-based layout. Components are laid out in order from left to right. When a component cannot be placed without horizontal clipping, a new row is started. This class supports horizontal and vertical gaps. These are used for spacing between components.
See Also:
Serialized Form

Field Summary

static int
CENTER
Constant that specifies center alignment.
static int
LEADING
Constant that specifies alignment to leading edge of container's orientation.
static int
LEFT
Constant that specifies left alignment.
static int
RIGHT
Constant that specifies right alignment.
static int
TRAILING
Constant that specifies alignment to trailing edge of container's orientation.

Constructor Summary

FlowLayout()
Initializes a new instance of FlowLayout with a center justification and a default horizontal and vertical gap of 5.
FlowLayout(int align)
Initializes a new instance of FlowLayout with the specified justification and a default horizontal and vertical gap of 5.
FlowLayout(int align, int hgap, int vgap)
Initializes a new instance of FlowLayout with the specified justification and gap values

Method Summary

void
addLayoutComponent(String name, Component comp)
Add a new component to the layout.
int
getAlignment()
Returns the current justification value for this object.
int
getHgap()
Returns the horizontal gap between components.
int
getVgap()
Returns the vertical gap between lines of components.
void
layoutContainer(Container parent)
Lay out the container's components based on current settings.
Dimension
minimumLayoutSize(Container cont)
Returns the minimum layout size for the specified container using this layout.
Dimension
preferredLayoutSize(Container cont)
Returns the preferred layout size for the specified container using this layout.
void
removeLayoutComponent(Component comp)
Remove the indicated component from this layout manager.
void
setAlignment(int align)
Sets the justification value for this object to the specified value.
void
setHgap(int hgap)
Sets the horizontal gap between lines of components to the specified value.
void
setVgap(int vgap)
Sets the vertical gap between lines of components to the specified value.
String
toString()
Return String description of this object.

Methods inherited from class java.lang.Object

clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

CENTER

public static final int CENTER
Constant that specifies center alignment.
Field Value:
1

LEADING

public static final int LEADING
Constant that specifies alignment to leading edge of container's orientation.
Field Value:
3

LEFT

public static final int LEFT
Constant that specifies left alignment.
Field Value:
0

RIGHT

public static final int RIGHT
Constant that specifies right alignment.
Field Value:
2

TRAILING

public static final int TRAILING
Constant that specifies alignment to trailing edge of container's orientation.
Field Value:
4

Constructor Details

FlowLayout

public FlowLayout()
Initializes a new instance of FlowLayout with a center justification and a default horizontal and vertical gap of 5.

FlowLayout

public FlowLayout(int align)
Initializes a new instance of FlowLayout with the specified justification and a default horizontal and vertical gap of 5.
Parameters:
align - The justification setting, which should be one of the contants in this class.

FlowLayout

public FlowLayout(int align,
                  int hgap,
                  int vgap)
Initializes a new instance of FlowLayout with the specified justification and gap values
Parameters:
align - Alignment
hgap - The horizontal gap
vgap - The vertical gap
Throws:
IllegalArgumentException - If either gap is negative

Method Details

addLayoutComponent

public void addLayoutComponent(String name,
                               Component comp)
Add a new component to the layout. This particular implementation does nothing.
Specified by:
addLayoutComponent in interface LayoutManager
Parameters:
name - the name
comp - the component

getAlignment

public int getAlignment()
Returns the current justification value for this object.
Returns:
The current justification value for this object.

getHgap

public int getHgap()
Returns the horizontal gap between components.
Returns:
The horizontal gap between components.

getVgap

public int getVgap()
Returns the vertical gap between lines of components.
Returns:
The vertical gap between lines of components.

layoutContainer

public void layoutContainer(Container parent)
Lay out the container's components based on current settings.
Specified by:
layoutContainer in interface LayoutManager
Parameters:
parent - The parent container

minimumLayoutSize

public Dimension minimumLayoutSize(Container cont)
Returns the minimum layout size for the specified container using this layout.
Specified by:
minimumLayoutSize in interface LayoutManager
Parameters:
cont - The parent container
Returns:
The minimum layout size.

preferredLayoutSize

public Dimension preferredLayoutSize(Container cont)
Returns the preferred layout size for the specified container using this layout.
Specified by:
preferredLayoutSize in interface LayoutManager
Parameters:
cont - The parent container
Returns:
The preferred layout size.

removeLayoutComponent

public void removeLayoutComponent(Component comp)
Remove the indicated component from this layout manager. This particular implementation does nothing.
Specified by:
removeLayoutComponent in interface LayoutManager
Parameters:
comp - The component to remove

setAlignment

public void setAlignment(int align)
Sets the justification value for this object to the specified value.
Parameters:
align - The new justification value for this object, which must be one of the constants in this class.

setHgap

public void setHgap(int hgap)
Sets the horizontal gap between lines of components to the specified value. No Exception is thrown if hgap <320.
Parameters:
hgap - The new horizontal gap between components.

setVgap

public void setVgap(int vgap)
Sets the vertical gap between lines of components to the specified value. No Exception is thrown if vgap <320.
Parameters:
vgap - The new vertical gap.

toString

public String toString()
Return String description of this object.
Overrides:
toString in interface Object
Returns:
A string representation of this object.
FlowLayout.java -- Grid-based layout engine Copyright (C) 1999, 2000, 2001, 2002, 2004 Free Software Foundation This file is part of GNU Classpath. GNU Classpath is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. GNU Classpath is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GNU Classpath; see the file COPYING. If not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. Linking this library statically or dynamically with other modules is making a combined work based on this library. Thus, the terms and conditions of the GNU General Public License cover the whole combination. As a special exception, the copyright holders of this library give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you may extend this exception to your version of the library, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version.

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