Clearly Visual Basic: Programming with Visual Basic 2008 Chapter 5 Do It Yourself Designing.

Clearly Visual Basic: Programming with Visual Basic 2008

Chapter 5 Do It Yourself Designing

Objectives

• Use a text box to get user input

• Perform an action with a button control

• Code a control’s Click event procedure

• Stop an application using the Me.Close() instruction

Clearly Visual Basic: Programming with Visual Basic 2008 2

Delegating the Work

• Figure 5-1 – Shows Addison Smith problem’s output, input, and

algorithm

• When designing interface for a problem– Examine each step in the problem’s algorithm, along

with its output and input items

• Assign meaningful names to each of the controls listed in Figure 5-2

• Camel case – Uppercase letters appear as “humps” in the name


5Clearly Visual Basic: Programming with Visual Basic 2008


Mini Quiz1.It is customary to show the results of a calculation as a ____.2.Using Hungarian Notation, which of the following is a good name for the city? cityTextBox TextBoxCity txtCity TxtCity3.The three-character ID for a button control name is ______.

8- Commission Calculator ProgramCreate a new application program called Commission Calculator ProjectChange font property to Sego UI, 9pt and StartPosition to CenterScreenChange the forms Text Property to Commission CalculatorChange the forms Name to: frmMain

Delegating the Work (continued)

• Sentence capitalization– Capitalize only first letter in each word and in any

words that are customarily capitalized– Example: identifying labels

• Book title capitalization– Capitalize first letter in each word, except for articles,

conjunctions, and prepositions– Example: button captions


Making the Interface More User-Friendly

• Access key– Allows user to select a menu using the Alt key in

combination with a letter or number– Not case sensitive– Should be assigned to each control (in the interface)

that can accept user input– Allows user to work with interface even when mouse

becomes inoperative



Quick Access Keys- Driven by the ALT KEY

Making the Interface More User-Friendly (continued)

• Tab order– Determined by number stored in each control’s

TabIndex property

• When interface is first created– TabIndex values reflect the order in which each

control was added to the form



Tab Order- View- Tab Order

Do What I Tell You To Do

• Code– Visual Basic instructions

• Event procedure– Tells an object how to respond to an event

• Code Editor window– Used to enter an event procedure’s code


The Me.Close() Instruction

• Tells the computer to close the current form

• Method – A predefined procedure that you can call (or invoke)

when needed

• Good programming practice: test a procedure after you have coded it


Mini Quiz 2

• If a text box’s Tab Index is set to 7, it’s indentifying label should be set to: _______

• If a text box’s access key is the letter t, you can move the focus to the text box by pressing _____

• The first line in a procedure (when you double click on a button) is the: ______ procedure header


Review Questions• To give the user control, assign the task to a:

Button Label Picture Box Text Box

• Which of the following designates Z as an access key?*Zip Code ^Zip Code &Zip Code #Zip Code

• The computer processes a button’s click when the user:Clicks the button Uses button access code Tabs to the Button All of the These

• Which of the following appears in the header and associates the procedure with the btnSave control’s Click Event: The answer is: Handles.btnSave.Click

• Which of the following tells the computer to stop an application: The answer is Me.Close ()


#3 – Tip Calculator Interface

Note: We are just doing Interfaces, Tab Orders, and Access Keys, NOT the programming- Except the Exit Button

#4 Property Tax Solution


Property Tax Solution Algorithm

Output: annual property tax

Input: Assessed Value Property Tax Rate

Algorithm:1.Enter assessed value and property tax rate2.Calculate annual property tax by dividing accessed value by 100, and then multiplying the quotient by the property tax rate3.Display the annual property tax

#5 Sales Project


Sales Solution AlgorithmOutput: Total Sales, North Percent, South Percent, East Percent, West PercentInput: North region sales, South sales, East sales, West sales

Algorithm: 1.Enter North sales, South Sales, East Sales & West Sales2.Calculate Total Sales by added up all the regions sales3.Calculate North’s percent by dividing North’s Sales by Total Sales4.Calculate South’s percent by dividing South’s Sales by Total Sales5.Calculate East’s percent by dividing East’s Sales by Total Sales6.Calculate West’s percent by dividing West’s Sales by Total Sales7.Display Total Sales, North’s Percent, South’s percent, East’s Percent and West’s Percent

Summary

• A problem’s input, output, and algorithm – Used when designing solution’s interface

• Text boxes provide area for user to enter data

• Buttons are used to perform action when clicked

• Output items typically appear in label controls

• Object names in Hungarian notation – Begin with an ID that identifies the object’s type


Summary (continued)

• To prevent a label from changing its size while application is running:– Change its AutoSize property to False

• A label’s BorderStyle property – Determines whether the label has a border

• An interface’s tab order – Determined by number stored in each control’s

TabIndex Property

• The Me.Close() instruction – Used to end an application


Clearly Visual Basic: Programming with Visual Basic 2008 Chapter 5 Do It Yourself Designing.

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