CPSC 233 TutorialXin Apr 6, 2011

Reading files An example available on my website

pages.cpsc.ucalgary.ca/~liuxin

Layout manager describe how components are arranged

Add a layout manager to Jframe eg., framWindow.setLayout(new

BorderLayout());

Designate positions in the add() method eg., add(button, BorderLayout.SOUTH);

Java build-in layout mangers BorderLayout, GridLayout, GridBagLayout, etc.

BorderLayout Place components into five regions

NORTH, SOUTH, EAST, WEST, CENTER

add(button, BorderLayout.SOUTH)

BorderLayout.NORTH

BorderLayout.WEST

BorderLayout.EAST

BorderLayout.SOUTH

FlowLayout Arranges components one after the other

from left to right in the order in which components are added

GridLayout Arrages components in a 2D grid.

(0, 0) (0, 1) (0, 2) (0, 3)

(1, 0) (1, 1) (1, 2) (1, 3)

(2, 0) (2, 1) (2, 2) (2, 3)

Grid Bag Layout A flexible and powerful layout manager.

places components in a 2D grid

Allow specified components to span multiple rows or columns

Uses components’ preferred sizes to determine how big the cells should be

A good online tutorial: http://download.oracle.com/javase/tutorial/uiswing/layout/gridbag.html

An example from Sun http://download.oracle.com/javase/tutorial/ui

swing/layout/gridbag.html

Work with GridBagLayout

Specifying constraints with GridBagConstraints

frameWindow.setLayout (new GridBagLayout());GridBagConstraints c = new GridBagConstraints();//For each component to be added to this container://...Create the component...//...Set instance variables in the GridBagConstraints instance...pane.add(theComponent, c);

GridBagConstraints Attributes to set up

gridx, gridy gridwidth, gridheight fill

NONE, HORIZONTAL, VERTICAL, or BOTH ipadx, ipady

internal padding insects

external padding anchor

CENTER, PAGE_START, PAGE_END, … weightx, weighty

determine how to distribute space among columns and rows

James’ Example For your in-class practice