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Classes and Interfaces javaxswingeventItemEvent javaxswingeventItemListener javaxswingJToggleButton Methods Object getItem( ) int getStateChange( ) void itemStateChanged(ItemEvent ie) void addItemListener(ItemListener il) boolean isSelected( ) void setSelected(boolean on)
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Sometimes you will want to use a button to turn some function on or off For example, imagine a desktop application that controls a conveyor belt The GUI for this application could use a button called Run to turn the conveyor on and off The first time the button is pressed, the conveyor turns on When pressed again, the conveyor turns off Although this type of functionality can be implemented using JButton, Swing offers a better option: JToggleButton This recipe shows how to use it JToggleButton looks just like a push button, but it acts differently because it has two states: pushed and released When you press a toggle button, it stays pressed rather than popping back up as a regular push button does When you press the toggle button a second time, it releases (pops up) Therefore, each time a toggle button is pushed, it toggles between its two states
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Although useful in its own right, JToggleButton is important for another reason: it a superclass for two other Swing components that also represent two-state controls These are JCheckBox and JRadioButton, which are described in Create Check Boxes and Create Radio Buttons Thus, JToggleButton defines the basic functionality of all two-state components
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To use a toggle button involves these steps: 1 Create an instance of JToggleButton 2 Register an ItemListener for the button and handle item events generated by the button 3 To determine if the button is on or off, call isSelected( ) on the JButton instance If the button is pushed, this method will return true Alternatively, call getStateChange( ) on the ItemEvent instance It returns the button s current state 4 You can select (ie, push) a toggle button under program control by calling setSelected( )
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Toggle buttons are objects of the JToggleButton class JToggleButton extends AbstractButton (Although related to a push button, JToggleButton does not extend JButton) JToggleButton defines several constructors, which allow you to specify the text and/or image that is displayed within the button You can also set its initial state The constructor used by this recipe is shown here: JToggleButton(String str, boolean state) This creates a toggle button that contains the text passed in str If state is true, the button is initially pressed (selected) Otherwise, it is released (deselected) JToggleButton generates an action event each time it is pressed It also generates an item event, which is an object of type ItemEvent An item event is used by those components that support the concept of selection When a JToggleButton is pressed in, it is selected When it is popped out, it is deselected Although you can manage a toggle button by handling its action events, a toggle button is typically managed by handling its item events Item events are handled by implementing the ItemListener interface This interface specifies only one method: itemStateChanged( ), which is shown here: void itemStateChanged(ItemEvent ie) The item event is received in ie To obtain a reference to the item that changed, call getItem( ) on the ItemEvent object This method is shown here: Object getItem( ) The reference returned must be cast to the component class being handled, which in this case is JToggleButton The getItem( ) method is particularly helpful in cases in which two
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or more components share the same ItemEvent handler, because it gives you a way to identify which component generated the event When an item event occurs, the component will be in one of two states: selected and deselected The ItemEvent class defines the following static int constants that represent these two states
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