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CS12420 - Lecture 02 Menus

CS12420 - Lecture 02 Menus. Lynda Thomas ltt@aber.ac.uk. Menus are like Buttons. Use a Listener Classes involved are: JMenuBar JMenu JMenuItem Warning: you may use words slightly differently!. MenuBar. Menu. MenuItem. Look in menus directory for FirstMenuFrame.java. Alternatively.

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CS12420 - Lecture 02 Menus

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  1. CS12420 - Lecture 02Menus Lynda Thomas ltt@aber.ac.uk

  2. Menus are like Buttons • Use a Listener • Classes involved are: • JMenuBar • JMenu • JMenuItem • Warning: you may use words slightly differently!

  3. MenuBar Menu MenuItem

  4. Look in menus directory for FirstMenuFrame.java

  5. Alternatively • You could use a separate MenuListener class • See SecondMenuFrame.java and MenuListener.java • Let’s step through code with debugger and see animation of what is happening...

  6. 1: new SecondMenuFrame() JFrame 4: new MenuListener(this) MenuListener SimpleFrame smFrame SecondMenuFrame 7: setPanelColor(Color.green) 3: new ColorPanel JMenu Colours JMenu Options JMenuItem Green JMenuBar JMenuItem JMenuItem JMenuItem JMenuItem 2: new JMenu* JPanel ColorPanel 6: select green: actionPerformed called 5: e.g. green.addActionListener(menuList)

  7. Filling in some blanks..

  8. Layout Managers • BorderLayout is default for JFrame • FlowLayout is default for JPanel • GridLayout: public TextPanel() { setLayout(new GridLayout(2,2,5,5)); //2 rows, 2 cols, spaces add (new JLabel("Amount: ")); inputField=new JTextField(8); add (inputField); add (new JLabel("Balance: ")); balanceField=new JTextField(8); add (balanceField); }

  9. Possible mistakes: • Misspelling javax.swing in import • Forgetting setVisible(true) (done for you in SimpleFrame) • Forgetting the JFrame.EXIT_ON_CLOSE • If buttons etc. don’t work: • Have you got something Listening to the button? • Is there an appropriate action in actionPerformed? • Try just printing ‘they hit button X’

  10. More components Radio buttons and Combo boxes ComboBoxDemo.java and RadioButtonDemo.java

  11. In this lecture • We looked at menus In the next lecture we look at drawing

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