Event Driven Programming
in Visual FoxPro

	Ted Roche, Senior Consultant

VFP Overview

What to do?

	Don’t Panic!
				Hitchhiker’s Guide to the Galaxy
	Experiment! FoxPro 1.0, 2.0 had learning curves, too
	The quicker you get to the keyboard, the longer it takes to solve the problem.

Event Driven Programming
in Visual FoxPro

	READ EVENTS
	CLEAR EVENTS
	Questions?

Event Driven Programming
in Visual FoxPro

	Okay, there really is a little more to it than that...
	Visual FoxPro is so granular!
		2nd most popular term after Cool!

Agenda

	Basics: What’s an event? - 10 minutes
	What Events are there? 20 minutes
	Which Controls have which Events? 10 minutes
	Event Firing order - 10 minutes
		Form’s Inits through Unload
		Data Environments
	Q & A

What’s an Event?

	Events:
		System-generated
		New Events cannot be added
		Methods of the same name fire in response to the event
	Event Firing Sequence is one of the keys to understanding VFP

What Events are there?

	Let’s look at our event database
	Event Frequency Tables

Which controls have which events?

	(handouts)
	Nearly all have Init, Error, Destroy
	Visible controls have Move, Drag, Get/LostFocus
	Individual controls have specific events

Event Firing Sequence

	Load: First; accept parameters
	Init: Innermost outward
		allows outermost containers to work on contents
	Destroy: Outermost inward
	Unload: last; provide return values
	Event Modeling Tool

Summary

	Events are what it is all about: interactive, visual interfaces
	Find the best event to match the sequence of operator action

Where to get more information

	#1: FoxHelp.Hlp
	Read The Fine Manuals
	Read The Fantastic sample code
	Related sessions:
		Form Designer – Builders
		Grids – OOP
		VFP Classes