Objects and their Event Procedures

What are an ObjectÆs Event Procedures?

Here is a list of some of your personal Event Procedures?

Procedure	Event that Triggers it
Laugh	Something funny happens
Eat	Hunger
Sleep	Exhaustion
Cry	Sadness/happiness

Objects (Controls) in a Visual Basic program have Event Procedures as well. Here are just some of the Event Procedures shared by most Visual Basic Objects:

Procedure	Event that Triggers it
Click	The Object was clicked on with the mouse
KeyDown	A key was pressed while the Object had the focus
KeyUp	A key was released while the Object had the focus
MouseMove	The mouse was moved while it was over the Object
MouseDown	A mouse button was pushed down over an Object
Leave	The currently selected Object is about to lose the focus

Why are Objects (controls) and their Event Procedures important in Visual Basic?

When you place a Button control into a Visual Basic program, you would normally want to allow users to click on it. The Button control comes with an Event Procedure called Click, that is automatically executed when the button is clicked on. Most of the Event Procedures that come ready-made with a Control are the ones that you will most commonly need. You also have the option of adding your own custom event handlers to an object.

To access an ControlÆs Event Procedures, double-click on the Control after placing it on a form.  This opens the Code window and displays that control's default event procedure.   Note: Visual Basic Objects will commonly be referred to as Controls throughout the rest of this class.