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Showing content from https://docs.oracle.com/en/java/javase/19/docs/api/java.desktop/java/awt/FlowLayout.html below:

FlowLayout (Java SE 19 & JDK 19)

All Implemented Interfaces:: 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

Flow layouts are typically used to arrange buttons in a panel. It arranges buttons horizontally until no more buttons fit on the same line. The line alignment is determined by the

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:

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:

1.0

See Also:

Field Summary
Fields

static final int

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

static final int

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 final int

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

static final int

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

static final int

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
Constructors

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

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

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

Adds the specified component to the layout.

int

Gets the alignment for this layout.

boolean

Returns true if components are to be vertically aligned along their baseline.

int

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

int

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

void

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

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

void

Removes the specified component from the layout.

void

Sets the alignment for this layout.

void

Sets whether or not components should be vertically aligned along their baseline.

void

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

void

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

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

Field Details
- LEFT
  public static final int LEFT
  
  This value indicates that each row of components should be left-justified.
  See Also:
  - Constant Field Values
- CENTER
  public static final int CENTER
  
  This value indicates that each row of components should be centered.
  See Also:
  - Constant Field Values
- RIGHT
  public static final int RIGHT
  
  This value indicates that each row of components should be right-justified.
  See Also:
  - Constant Field Values
- LEADING
  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
  
  See Also:
- TRAILING
  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
  
  See Also:
Constructor Details
- FlowLayout
  public FlowLayout()
  
  Constructs a new FlowLayout with a centered alignment and a default 5-unit horizontal and vertical gap.
- FlowLayout
  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
- FlowLayout
  public 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.
  
  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
Method Details
- getAlignment
  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:
  
  1.1
  
  See Also:
  - setAlignment(int)
- setAlignment
  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:
  
  1.1
  
  See Also:
  - getAlignment()
- getHgap
  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:
  
  1.1
  
  See Also:
  - setHgap(int)
- setHgap
  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:
  
  1.1
  
  See Also:
  - getHgap()
- getVgap
  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:
  
  1.1
  
  See Also:
  - setVgap(int)
- setVgap
  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:
  
  1.1
  
  See Also:
  - getVgap()
- setAlignOnBaseline
  public void setAlignOnBaseline(boolean alignOnBaseline)
  
  Sets whether or not components should be vertically aligned along their baseline. Components that do not have a baseline will be centered. The default is false.
  
  Parameters:
  
  alignOnBaseline - whether or not components should be vertically aligned on their baseline
  
  Since:
  
  1.6
- getAlignOnBaseline
  public boolean getAlignOnBaseline()
  
  Returns true if components are to be vertically aligned along their baseline. The default is false.
  
  Returns:
  
  true if components are to be vertically aligned along their baseline
  
  Since:
  
  1.6
- addLayoutComponent
  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
- removeLayoutComponent 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()
- preferredLayoutSize
  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:
- minimumLayoutSize
  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:
- layoutContainer 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()
- toString
  Returns a string representation of this FlowLayout object and its values.
  
  Overrides:
  
  toString in class Object
  
  Returns:
  
  a string representation of this layout

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