1 / 22

Swing Components III

Swing Components III. Chapter 12 - Student JFrame, Component Methods. JFrame windows. Window. Mostly used for ____________ Generic type that _______ and Dialog inherit 3 important methods : dispose() – eliminate ___________ when done pack() – __________ to fit added components

richard-gentry
Download Presentation

Swing Components III

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Swing Components III Chapter 12 - Student JFrame, Component Methods

  2. JFrame windows

  3. Window • Mostly used for ____________ • Generic type that _______ and Dialog inherit • 3 important methods: • dispose() – eliminate ___________ when done • pack() – __________ to fit added components • setVisible(boolean) – make the window appear (c) 2005 by Elizabeth Sugar Boese

  4. JFrame • Uses ____________ by default • Possible ornaments: • Title • ____________ • Menu • ____________ • Widgets to hide/minimize/grow • Methods: • Constructors: • JFrame() • JFrame( String title) • setBounds( w, h ) • setSize( w, h ) (c) 2005 by Elizabeth Sugar Boese

  5. JFrame text is the title on the JFrame • Create a JFrame window JFrame frame; frame = new JFrame( text ); • Set the ____________ on the screen (optional) frame.setLocation( 500, 600 ); • Major Steps 1. ______________________. JFrame frame; frame = new JFrame("FrameDemo"); 2. Set ________________ frame.setLayout( new BorderLayout( ) ); 3. Create components and _________________________ JButton go = new JButton( "Go for it!" ); frame.add(universe, BorderLayout.SOUTH); 4. _________ the frame. frame.pack(); OR frame.setSize( 200, 500 ); 5. Show it. frame.setVisible(true); Calling the .pack( ) method will size the frame based on the minimum size to fit all the components added to the frame. (c) 2005 by Elizabeth Sugar Boese

  6. JFrame – Simple Example import javax.swing.*; public class JFrameDefault extends JApplet { JFrame frame; public void init( ) { frame = new JFrame( "Testing JFrame stuff" ); frame.setSize( 200,100 ); frame.setVisible( true ); } } (c) 2005 by Elizabeth Sugar Boese

  7. JFrame – Example with components import java.awt.*; import javax.swing.*; public class JFrameStuff extendsJApplet { JFrame frame; JLabel myname, universe; JButton go, skiing; public void init( ) { //1. Create the frame. frame = new JFrame("FrameDemo"); //2. Set layout manager frame.setLayout( new BorderLayout( ) ); //3. Create components and put them in the frame. myname = new JLabel( "<HTML>My <BR>Stuff", JLabel.CENTER ); go = new JButton( "Go for it!" ); skiing = new JButton( "Do you like skiing too?" ); universe = new JLabel( "I live at the borders of the universe where fact and fiction collide" ); frame.add(myname, BorderLayout.NORTH); frame.add(go, BorderLayout.WEST); frame.add(skiing, BorderLayout.EAST); frame.add(universe, BorderLayout.SOUTH); //4. Size the frame. frame.pack( ); //5. Show it. frame.setVisible(true); } } (c) 2005 by Elizabeth Sugar Boese

  8. JFrame Closing Behaviors • When user selects window manager Close option for JFrame, has default behavior • JFrame did nothing • JFrame hides itself • setDefaultCloseOperation (operation) • DO_NOTHING_ON_CLOSE • HIDE_ON_CLOSE • DISPOSE_ON_CLOSE • No EXIT_ON_CLOSE operation (c) 2005 by Elizabeth Sugar Boese

  9. JFrame - Events • usually want to pop open a JFrame based on an event (e.g. a button click) • Example (c) 2005 by Elizabeth Sugar Boese

  10. Dialogs (extra material)

  11. JOptionPane Examples (c) 2005 by Elizabeth Sugar Boese

  12. Dialog • For simple _______________ with user • Uses _______________ by default • Are _____ by default (can change to modeless setModal(false) • Constructors: • Dialog( Frame parent ) • Dialog( Frame parent, String title ) • Dialog( Frame parent, boolean isModal ) • Call to super( ) (c) 2005 by Elizabeth Sugar Boese

  13. Dialog Example Frame frame = new Frame( ); Dialog d = new Dialog( frame, “Hi there”, true ); JButton button = new JButton( “Okay?” ); JPanel panel = new JPanel(); p.add( button ); d.add( panel ); d.setSize( 400,100 ); d.setVisible( true ); (c) 2005 by Elizabeth Sugar Boese

  14. Menu (extra material)

  15. Menu • MenuBar • Collection of Menus • Associated with a Frame • Menu • Collection of MenuItems and separators • Can be a MenuItem for hierarchical menus • MenuItem • Enabled or disabled • May be checkable (c) 2005 by Elizabeth Sugar Boese

  16. Component Methods

  17. Component Methods • Common methods works on most components (e.g. JLabel, JButton, JPanel, etc.) • setBackground ( Color ) • setForeground ( Color ) • setBorder ( Border ) • setFont ( Font ) • setToolTipText( String ) • setVisible ( boolean ) (c) 2005 by Elizabeth Sugar Boese

  18. Component Methods - JButton • JButton • addActionListener ( this ) • setBorderPainted ( boolean ) • setContentAreaFilled ( boolean ) • setDisabledIcon ( ImageIcon ) • setIcon ( ImageIcon ) • setHorizontalAlignment ( int ) • setHorizontalTextPosition ( int ) • setRolloverIcon ( ImageIcon ) • setText ( String ) Parameter int one of: JButton.LEFT JButton.CENTER JButton.RIGHT (c) 2005 by Elizabeth Sugar Boese

  19. Component Methods – JCheckbox, JRadioButton • JCheckbox and JRadioButton • addItemListener ( this ) • isSelected ( ) Returns true if currently selected, false if not selected (c) 2005 by Elizabeth Sugar Boese

  20. Component Methods - JLabel • JLabel • setIcon ( ImageIcon ) • setText ( String ) (c) 2005 by Elizabeth Sugar Boese

  21. Component Methods - text • JTextField • getText ( ) • setText ( ) • JTextArea • append ( String ) • getText ( ) • setLineWrap ( boolean ) • setText ( String ) • setWrapStyleWord ( boolean ) (c) 2005 by Elizabeth Sugar Boese

  22. Summary • JFrame • Dialogs • Menu • Component methods (c) 2005 by Elizabeth Sugar Boese

More Related