Events

• Sent by Operating System
• Bind an Event to an Event Handler
• When Event Happens, Call Event Handler

Events

• Mouse Moved
• Key Pressed
• Key Released
• Text Changed
• Get Focus / Enter
• Lose Focus / Leave
• Resize

Java Swing

• Implement a Listener Interface
• Add Listener to Element
• Program will call Listener on Event

Python tkinter

• Bind Event to Callback Function
• Program will call Callback Function

Event Handler

• aka Listener, Callback
• Function Called when Event Happens
• Gets Data About Event
• Can Update GUI, Perform Action
• Long Operations Should Spawn Threads