Session 3 - Layout Manager and Swing Menu Component

8/3/2019 Session 3 - Layout Manager and Swing Menu Component

1/23

Session 3

Layout Managers

Swing Menu Component


2/23

Slide 2/23

Introduce to advance swing control

Jslider

JProgessBar

Timer

Introduce to Dialog

Type of Dialog

Working with Dialog


3/23

Slide 3/23

Module 1:

Introduction to Layout Manager

FlowLayout Manager

BorderLayout Manager GridLayoutManager

CardLayout Manager


4/23

Slide 4/23

All Containers in Java whether top-level or general-purpose

are based on the concept of Layout managers

A layout manager is a Java object associated with a container

which governs the placement and size of the component


5/23

Slide 5/23

Steps Invoke setLayout()

Pass a layout manager class

setPreferredSize()

setM

inimumS

ize() setMaximumSize()

Working of a Layout Manager

When GUI-based application in Java is executed, the pack() methodis invoked. The pack() method invokes the getPreferredSize()

method of the frame to determine the best size for laying out thecomponent

Demo Code


6/23

Slide 6/23

Java supports different types of Layout manager are:


7/23

Slide 7/23

Benefits and Drawbacks

Simple to use

Components placed in the center of the container by default

Suitable for JApplet which runs as part of a Web Page.

If the Container is resized of looses the original alignment, some

component may go up or down depending upon the width

Complex alignment cannot be achieved

Demo Code


8/23

Slide 8/23

The BorderLayout manager allows to add components in the east,

west, north, south and center of a container. Benefits and Drawbacks

Allows to specify the direction where the component is to placed

By default the component is placed in the center

Component can added in only four to five location in a container

Absolute positioning of component is not possible

Demo Code


9/23

Slide 9/23

The GridLayout Manager places the

components in terms of rows and columns.


Simple to use

Useful for grouping componets in a rectanglar

pattern

Each component is of same size

Cannot create a complex layout like

GridBagLayout where a cell can span more than

one row or column

Demo Code


10/23

Slide 10/23

The CardLayoutManager allows you to stack components

one behind another like deck of cards. Only one component

is visible at a time and that is the component on top. To

display other components, one has to flip them based on.


11/23

Slide 11/23

Some methods

first(Container parent)

next(Container parent)

previouse(Container parent)

last(Container parent)


Allows several containers and their associated component to sharethe same space in the container.

Not visually appealing as a tabbed pane

Requires other components like buttons or drop-down to flip through

Demo Code


12/23

Slide 12/23

Module 2

Menu Components

File Dialog box

JToolBar


13/23

Slide 13/23

A menu system provides a menu bar below the windowstitle bar. This bar contains items called a menu. When youclick a menu it drops down and display various choicescalled menu items. Each of these menu items is associatedwith actions to perform desired action. You can choose thetask by clicking a menu item


14/23

Slide 14/23

JMenuBar

JMenu

JMenu with Separator

JMenu with Memonic

JMenu with icon

JMenu with Accelerator

JMenu with Disable

JMenuItem

JCheckBoxMenuItem

JRadioMenuItem

Demo Code


15/23

Slide 15/23

Event Handling

actionPerformed

Methods of J

MenuItem

isSelected()

setSelected(boolean state)


16/23

Slide 16/23

A JPopupMenu is menu which pops up when you right click

on a container. The popup menu appears exactly at the

location where you right clicked.

Demo Code


17/23

Slide 17/23

A JFileChooser is a standard dialog box that is used to navigate

the file system to:

Accept a directory or file name to create a new one

Perform operations like open and save, with different labels and buttons.

Provide previews and display appropriate icons

Display the fiel with required criteria by applying filters.


18/23

Slide 18/23

Constructors

Methods of JFileChooser

Demo Code


19/23

Slide 19/23

Return value of methods

FileChooser.CANCEL_OPTION if you cancel the dialog box

JFileChooser.APPROVE_OPTION if you acceptthe file

JFileChooser.ERROR_OPTION if an error occurs or the dialog is

dismissed.

Demo Code


20/23

Slide 20/23

The JFileChooser by default displays all the files in the

current directory. However, at times it is requires to display

only those files which match certain criteria.

Demo Code


21/23

Slide 21/23

JToolBar is similar to a menu bar and contains buttons with

icons. These buttons generate events when clicked and can

be associated with actions.

Dockable JToolBar


22/23

Slide 22/23

Constructors

Demo

Demo Code


23/23

Slide 23/23

Module 1:

Introduction to Layout Manager

FlowLayout Manager

BorderLayout Manager

GridLayoutManager

CardLayout Manager

Module 2:

Menu Components

File Dialog box

JToolBar

Documents

Session 3 - Layout Manager and Swing Menu Component