Chapter One An Introduction to Visual Basic 2010 Programming with Microsoft Visual Basic 2010 5 th Edition

Chapter OneAn Introduction to Visual Basic 2010

Programming with Microsoft Visual Basic 2010

5th Edition

Programming with Microsoft Visual Basic 2010, 5th Edition

Lesson B Objectives

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After studying Lesson B, you should be able to:

Add a control to a formSet the properties of a label, picture box,

and button controlSelect multiple controlsCenter controls on the formOpen the Project Designer window


Lesson B Objectives (cont’d.)

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Start and end an applicationEnter code in the Code Editor windowTerminate an application using the Me.Close() instruction

Run the project’s executable file


The Toolbox Window

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Class: Pattern from which object is createdObject: Instance with behaviors and

attributesToolbox window (or toolbox)

Contains tools for designing user interfaceEach tool represents class Controls are instantiated using tools from

toolbox Controls: GUI objects that appear on a

form


The Toolbox Window (cont’d.)

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Figure 1-15 Toolbox window showing the purpose of the Label tool


The Label Tool

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Label tool: Used to create label controlLabel control: Displays text that cannot

be edited at run timeName property: Unique name for controlText property

Specifies value that appears in label controlLocation property

Specifies location of control on formIncludes X value and Y value


Figure 1-17 Label control added to the form

Figure 1-16 Label tool being dragged to the form

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Changing a Property for Multiple Controls

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Control inherits the Font attribute of the formMay want to change from default values

To simultaneously modify similar controls Click one control and then press and hold

Ctrl keyClick other similar control(s) in form

Or click and drag to group controlsSet property value in Properties list


Changing a Property for Multiple Controls (cont’d.)

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Figure 1-18 Label controls selected on the form


Using the Format Menu

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Format menu: Options to manipulate form controlsAlign: Aligns selected controls by left, right,

top, or bottom bordersMake Same Size: Makes width and/or

height of selected controls uniformCenter in Form: Centers one or more

controlsSelect as first control the one whose size or

location you want to match Called reference control


The PictureBox Tool

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PictureBox tool: Creates picture box control

Picture box control: Displays image on form

Task box: Lists tasks associated with picture box

Use task box to import image into projectProject’s resource file contains imported

images


Figure 1-19 Open task list for a picture box

Figure 1-20 Completed Select Resource dialog box

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The PictureBox Tool (cont’d.)

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Figure 1-21 Image shown in the picture box


The Button Tool

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Button tool: Used to create button controlButton control: Used to perform action

when clickedExamples: OK and Cancel buttons

Common means of exiting a Windows applicationExit option on File menu Exit button


Starting and Ending an Application

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Startup form: Displays when application is first started

Project Designer window: Specifies startup form or executable code to be run Right-click My Project in Solution Explorer

window and then click OpenOr, click Project on menu and then click

<project name> PropertiesApplication tab: Specify startup form


Starting and Ending an Application (cont’d.)

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Figure 1-22 Application pane in the Project Designer window



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Executable file: File that can be run outside of the IDEFile name ends with .exeAutomatically created when starting Visual

Basic applicationTwo ways to start application in IDE

Click Debug on menu bar and then click Start Debugging

Press F5 key



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Figure 1-23 Result of starting the splash screen application


The Code Editor Window

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Event: User action such as double-clickingEvent procedure: Set of program

instructions that are processed when event occurs

Code Editor windowProvides templates for creating event

proceduresTo open Code Editor window

Right-click form and then click View Code


The Code Editor Window (cont’d.)

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Figure 1-24 Code Editor window opened in the IDE



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To collapse or expand a region of code in the Code Editor windowClick minus box to collapse codeClick plus box to expand code

Figure 1-25 Code collapsed in the Code Editor window



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Class Name list boxLists names of objects included in UI

Method Name list boxLists appropriate events for selected object

To select a control’s event in code editor windowSelect class name first and then select

method nameSyntax

Rules of programming language



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Procedure headerFirst line in code template for event

procedureProcedure footer

Last line in code template for event procedure

KeywordWord that has special meaning in

programming language Color-coded in IDE



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Sub procedureBlock of code that performs a specific task

Keywords in a sub procedure blockSub: starts a sub procedurePrivate: restricts the use of the procedure to

the form where it appearsEnd Sub: indicates the end of a sub

procedureEvent sub procedure names include object

name and event nameExample: btnExit_Click


The Me.Close() Instruction

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Method: Predefined procedure Can be called (or invoked) when needed

Me.Close() methodCauses current form to closeIf it is only form in application, the

application terminatesIntelliSense feature: Provides appropriate

selections as pop-up listsType first few letters of choiceThen use arrow keys to select an item in list


Figure 1-27 List displayed by the IntelliSense feature

Figure 1-28 Completed Click event procedure for the btnExit control

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Lesson B Summary

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To add a control to a form, use tool from toolbox

Use Label control for text that user cannot editCan set properties of multiple controls

simultaneouslyTo start and stop an application in IDE, use the

Debug menu choiceUse Code Editor window to display object’s

event procedures Me.Close() method closes the current form at

run time


True or False: The Me.Exit() method can be used to close the current form.

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False

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A(n) ____________________ control should be used to display text that the user cannot edit at run time.

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Label

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The rules of a programming language are called its ____________________.

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Syntax

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True or False: The Text property is only available for the label control

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False

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Documents

Chapter One An Introduction to Visual Basic 2010 Programming with Microsoft Visual Basic 2010 5 th Edition