Lecture Set 13

DrawingMouse and Keyboard EventsPart B – Mouse and Keyboard

Events

Slide 2

Objectives

Create event handlers for mouse events Determining the position of the mouse Determining which mouse button was clicked Learning when events, such as MouseClick, MouseDown, MouseEnter, MouseHover, and MouseMove fire

Create event handlers for keyboard events Determining which keyboard button was clicked Learning when events, such as KeyUp, KeyDown,

and KeyPress fire Learn about keyboard properties such as KeyChar, KeyData, and KeyCode and KeyValue

Slide 3

Add more material on mouse events

THIS SLIDE SET NOT YET COMPLETE Get material from Ch 13 of Ekedahl

original version of text Get material on keyboard events from

Dietel, pp 513ff

Slide 4

Introduction to Mouse Events

The MouseClick event fires when the end user clicks the mouse on a form

The MouseDown and MouseUp events fire when the end user presses and releases the mouse, respectively

The MouseEnter and MouseLeave events fire as the mouse enters and leaves a control instance

The MouseMove event fires whenever the end user moves the mouse

Slide 5

Determining Mouse Information

In graphical applications, it is necessary to get the position of the mouse to determine where to draw a shape

It is often necessary to determine which mouse button was clicked

The state of modifier keys (Ctrl, Alt, Shift) must also be determined

It is often necessary to determine whether the mouse wheel was scrolled

Slide 6

The MouseEventArgs Class

The MouseEventArgs class is used to get information about the mouse Use the Button property to determine

which mouse button was clicked Use the X and Y properties to determine

the position of the mouse Use the Delta property to determine the

number of detents the mouse wheel was scrolled