Java Event Handling
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Event Handling:
Introduction : Event handling is of fundamental importance to programs with a GUI. The java AWT event model works and how to use the simplest GUI elements. Jdk
Basic functions :
1- Creation of user interface components such as buttons , labels.
2- Support for giving behavior to the components by GUI events (buttionclick, mouseclick)
3- Support for grouping and arranging the components on the screen.
4- Support for accessing window manager facilities like that input focus , reading , JPEG and other image files and printing.
On screen buttons, menus , frames or other elements the user will touch next. This is known as event driven programming.
One flow of control beginning to end, the runtime system sits in a window main loop simply waiting for user input.
When turns it into an event and passes it on to a handler. This is known as callback.
Basics of event handling:
1- Declare and initialize event sources – buttons , menus , choices
2- Implement an interface to provide the event handler that responds to event.
3- Register this event handler with event source.
4- Add the event source to the container like applet , frame, panel etc.
Event delegation model
An event source produces events and dispatches them to all registers event listeners.
A single class can implement multiple listener interfaces.
A single listener object can register with multiple event sources.
Multiple listener objects can register with a single event source( multicast).
Events: is the encapsulation of some user input delivered to the application asynchronously.
AWT events is a root class of all AWT events.
AWTEvent is subclassed as : ActionEvent , WindowEvent , ItemEvent, KeyEvent, MouseEvent, TextEvent.
Evetn Listener Interfaces : Java we have a number of built in interfaces as listeners for different types of event handlings.
Interface Events Generated by
ActionLIstener Button , list , menuitem , textfield
AdjustmentListner- Scrollbar
ItemListener: checkbox, checkboxmenuitem , choice , list
Textlistener: TextComponents
ComponentListener: Component
CaontianerListener: Container
WindowListnener: Window
Handling Windows Events: windowListener interface has seven methods:
Public void windowClosing(WindowEvent e);
Public void windowClosed(WindowEvent e);
Public void windowOpened(WindowEvent e);
Public void windowIconified(WindowEvent e);
Public void windowDeIconoified(WindowEvent e);
Public void windowActivated(WindowEvent e);
Public void windowDeactivated(WindowEvent e);
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Using a Listener Adapter Class :
To make a things a little more convenient a concept called adaptor classes can be used.
Compound Adapter
Mouse Motion Adapter
Container Adapter
Focus Adaptor
Key Adapter
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