Chapter 13

fig 13-4
JLabel mylabel = new JLabel(String)
JLabel mylabel = new JLabel(String, Icon, position of icon)
    positions:  SwingConstants.LEFT    .RIGHT   .CENTER
                              .TOP     .BOTTOM  .CENTER
                                
mylabel.setText(String)
mylabel.setIcon(Icon)
mylabel.setToolTip(String)
mylabel.setHorizontalAlignment(position)


fig 13-7
JTextField mytext = new JTextField(int size)
JTextField mytext = new JTextField(String, int size)
mytext.setEditable(boolean)     //default true

JPasswordField mypass = new JPasswordField(int size)


fig 13-10
JButton mybutton = new JButton(String)
JButton mybutton = new JButton(String, Icon)
mybutton.setVisible(boolean)
mybutton.setRolloverIcon(Icon)


fig 13-11
JCheckBox mycheck = new JCheckBox(String)
mycheck.isSelected()    //returns boolean
mycheck.addItemListener(object that implements ItemListener)


fig 13-12
JRadioButton myradio1 = new JRadioButton(String, boolean selected)
myradio1.addItemListener(object that implements ItemListener)

ButtonGroup myradios = new ButtonGroup()    //not added to a Container
myradios.add(myradio1)


fig 13-13
JComboBox mycombo = new JComboBox(String[])
mycombo.setMaximumRowCount(int rows)
mycombo.getSelectedIndex()
mycombo.addItemListener(object that implements ItemListener)


fig 13-14
JList mylist = new JList(String[])
mylist.setVisibleRowCount(int rows)
mylist.setSelectionMode(ListSelectionModel.SINGLE_SELECTION)
mylist.setFixedCellWidth(int pixels_size)
mylist.setFixedCellHeight(int pixels_size_item)
mylist.getSelectedIndex()
container.add(new JScrollPane(mylist))   //scroll bars not with JList
mylist.addListSelectionListener(object that implements ListSelectionListener)
mylist.setListData(String[])
mylist.getSelectedValues()    //returns String[]



***************************
Layout Managers

Container container = getContentPane();

FlowLayout: left to right, top to bottom

FlowLayout layout = new FlowLayout();
container.setLayout( layout );
OR
container.setLayout( new FlowLayout() );

container.add( someGUIobject );     //in order added
container.add( someGUIobject, 6 );     //in 6th position


BorderLayout: 5 areas: NORTH SOUTH EAST WEST CENTER
NORTH SOUTH thin & wide
EAST WEST tall & narrow
CENTER hogs
don't have to use all 5 areas.  others will expand into that unused area
default for JApplet

BorderLayout layout = new BorderLayout();
BorderLayout layout = new BorderLayout(4,4);  //gaps between areas (1,1 is default)
container.setLayout( layout );
OR
container.setLayout( new BorderLayout() );

container.add( someGUIobject, BorderLayout.EAST);  //etc.



GridLayout: rows & columns table

GridLayout layout = new GridLayout(4,3);   //4 rows, 3 columns
container.setLayout( layout );
OR
container.setLayout( new GridLayout(4,3) );

container.add( someGUIobject );     //in order added


//All the layout managers:
//realign, re-layout if GUIs move, change, visible:
layout.layoutContainer (getContentPane() );  
OR
container.validate();


Each area can have only one GUI object.
But the GUI object can be a JPanel which is composed of GUI objects
managed by a layout manager.

JPanel myPanel = new JPanel();
myPanel.setLayout( new GridLayout(2,4));  //or other layout manager for this panel
myPanel.add( someGUIobject );
...
container.add (myPanel);  //in next position
OR
container.add (myPanel, BorderLayout.SOUTH); //etc



Absolute positioning by not having a layout manager:
container.setLayout( null );

Each GUI component must be positioned by its setBounds method:
someGUIobject.setBounds( x1, y2, width, length );