Transcript Swing20revised

Designing a User Interface with
Swing
Assignment Swing:
Update code of an earlier program
Swing: Part of the Java
Foundational Classes JDK1.2
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Expanded components
Better event handling
Selectable look & Feel
Extends AWT
Benefits of Swing
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Swing provides for a different Look & Feel
Metal is the name of new interface in Java
All Components Compatibility (www…)
All Components written in Java(not so
earlier)
 import java.awt.swing.*; OR
 javax.swing in Beta 4 (and up)
An Applications Framework
 FRAMEWORK.JAVA
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Just provides a frame (no components)
 SWINGER.JAVA
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A button “I receive a disproportionate amount
of pleasure from being clicked. Please interact
with me.”
Jframe NEW term “ an intermediate container
called the content pane”
Jframe subdivided into panes
 Create Jframe
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Jframe frame = new Swinger( );
 Add all components (use add(Component))
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pane.add(hotbutton)
 Make the Jpanel
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Jpanel pane = new Jpanel( );
Working with Swing
 NEW TERM icon
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http://www.zeldman.com
(.gif files added to the icon
• ImageIcon una = new ImageIcon(“unabom.gif”);
 http://www.prefect.com/java21
Swing
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Labels
Jlabel(String , int)
Buttons
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TextFields JTextArea(int , int)
TextAreas
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Check Boxes and Radio Buttons
Choice Lists
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Scrollbars JScrollBar( int , int, int, int, int)
SwingColorTest
 An “old” program revisited & Updated
• It is the “old” Hue Saturation & Brightness OR
• RGB
 All done with Swing
New Swing UI manager
 A Swing Layout manager/ user-interface
manager
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Windows 95 or NT Look & Feel Motif XWindow, Metal, Swing’s cross platform “ “
 try { UIManager.setLookAndFeel(
 UIManager.getCrossPlatformLookAndFeel
Classname( )); } catch(Exception e) {
System.err.println(“Can’t set look and feel:
+ e;}
Keyboard Mnemonics
 A key Accelerator
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purpose (without a mouse) - use control keys
in combination with other keys to function
instead of mouse
Jbutton infoButton = new Jbutton(“Info”)’
infoButton.setMnemonic(‘I’);
Pressing Alt+ I causes “InfoButton” click
It’s ToolTime with Tim Allen
Kidding … ToolTips
 JScrollBar seed = JScrollBar( );
 Speed.setToolTip ( “Move to set animation
speed”);
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limit ToolTip ONLY one line long
Component Descriptions &
Names
 1. Get AssessibleContext( ) method on the
component
 2. Call setAcccessibleDescription(String)
method on that AccessibleContext object
 The string argument should be the
component’s text description
Standard Dialog Boxes
 Like Visual BASIC “Windows” that ask a
small/simple question, warn, or provide
message
 ConfirmDialog = Y/N Cancel
 InputDialog = prompt input
 MessageDialog = message
 OptionDialog = All of the above
Example
 Int response;
 response =
JOptionPane.showConfirmDialog(null,
“Should I delete all your irreplaceable
personal files”);
 MORE figures/code demo. Use of Dialog
Boxes
INFO.JAVA
 Last example of complete program in
chapter. Uses Dialog boxes - Swing