Adanced Java Programming

Layout Managers

Smt.M.Jeevana Sujitha

Assistant Professor

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Department of Computer Science and Engineering

SRKR Engineering College, Bhimavaram, A.P. - 534204

OBJECTIVES

The Objective of this lecture is

• To learn about different types of Layout Managers in AWT.

Need of Layout Managers

Layout Managers

What is Layout Manager?

• It is used to arrange the components in a particular manner.
• It is an interface that is implemented by all classes of layout managers.

Layout Managers

• There are six layouts available in AWT they are
• Border Layout
• Grid Layout
• Flow Layout
• Card Layout
• Grid Bag Layout
• Box Layout

Layout Managers

Border Layout:

• The border layout is used to arrange the components in five regions that is north, south, east, west and center.
• Each region may contain one component only.
• It is the default layout of frame or window.
• It provides five constants for each

region.

Layout Managers

Border Layout:

• The border layout provides five constants for each region. They are
• public static final int NORTH
• public static final int SOUTH
• public static final int EAST
• public static final int WEST
• public static final int CENTER Constructors:

BorderLayout() : Creates a border layout but with no gaps between the components

Layout Managers

Grid Layout:

• It is used to

arrange the components in a

rectangular grid.

• One component is displayed in each rectangle.

Layout Managers

Grid Layout:

• GridLayout(): creates a grid layout with one column per component in a row.
• GridLayout(int rows,int columns): creates a grid layout with the given rows and columns but no gap between the components.
• GridLayout(int rows,int columns, int hgap,int vgap): creates a grid layout with the given rows and columns along with horizontal and vertical gaps.

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Layout Managers

Flow Layout:

• It is used to arrange the components in a line one after another.
• It is the default layout of applet or panel.

Layout Managers

• Fields of FlowLayout:
• public static final int LEFT
• public static final int RIGHT
• public static final int CENTER
• public static final int LEADING
• public static final int TRAILING

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Layout Managers

Constructors of FlowLayout:

1. FlowLayout() : creates a flow layout with centered alignment and a default 5 unit horizontal and vertical gap.
2. FlowLayout(int align): creates a flow layout with the given alignment and a default horizontal and vertical gap.
3. FlowLayout(int align, int hgap, int vgap): creates a flow layout with the given alignment and the given horizontal and vertical gap.

Layout Managers

Card Layout:

• The CardLayout class manages the component in such a manner that only one component is visible at a time.
• It treats each component as a card.

Layout Managers

• Constructors:
• CardLayout(): creates a card layout with zero horizontal and zero vertical gap.
• CardLayout(int hgap, int vgap): creates a card layout with the given horizontal and vertical gap.

Layout Managers

GridBag Layout:

• The GridBagLayout class is used to align the components vertically, horizontally or along their base line.
• Each GridBagLayout object maintains a dynamic rectangular grid of cells.
• Each component occupies one or more cells known as its display area.

Layout Managers

Box Layout:

• The BoxLayout is used to arrange the components either vertically or horizontally.
• For this purpose it provides four constants. They are
• public static final int X_AXIS
• public static final int Y_AXIS
• public static final int LINE_AXIS
• public static final int PAGE_AXIS

BoxLayout( Container c, int axis) : creates a box layout that arranges the components with the given axis.

Layout Managers

public static final int X_AXIS

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public static final int Y_AXIS

THANK YOU