copyright 2003 : ismail m.romi, ppu. all rights reserved 1 lab2 managing controls

Copyright 2003 : Ismail M.Romi, PPU. All Rights Reserved

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Lab2Lab2

Managing ControlsManaging Controls


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Controls (Tools)


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PropertiesSet of attributes for each object used in VB,

that changes the appearance and behavior of a Form or Control.

Properties Types:1- Design-time properties: properties than can

be changed at the design mode.

2- Run-time properties: properties that can be changed at the run-time.


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Common Properties for controls• See Table 3.1 page 65

• Notes:– The Form’s Name property

should be unique in the project.

– The Control’s Name property should be unique on the same form.

– Name property can be changed at the design mode only.


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The Form Object• The background window that the user see

during the program execution.

• The forms are given default names; Form1, From2…

• On the form you can place the controls from the toolbox required for the user interface.


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The Form’s Properties• See 8.

• Caption: The text that appears in from’s title bar..

• Icon: Displays an icon when the form is minimized.

• Picture: Image placed as a background to the form.


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Changing Form Properties at Run-Time• Syntax:

FormName.PropertyName = Value

• Examples:

Form1.Caption = “ Student Record”

Form1.Left = 0

Form1.MousePointer = vbHourglass

Form1.MousePointer = 11


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Form Events• Load: Occurs during loading the form into

main memory.

• Unload: Occurs when removing the form from main memory.

Note: You can find all form and other Control’s

events in the code window in the events ComboBox.


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The Pointer Tool

The pointer tool is not a control.

•This tool used to deselect any selected control in the toolbox.


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The Label Control • A control that displays uneditable text to the

user.

• This control used to:

1- Provide a heading or description on the form.

2- Identify another control.


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The Label Control Properties• Alignment: 0:Left, 1:right, 2:centered.

• Autosize: (True/False), adjusts the label control height and width to suit the text.

• Wordwrap: (True/False), to wrap the text into multiple lines.

• Font, Caption, Backcolor ……

Events: Click, Dbclick……...


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Changing Control Properties at Run-Time

Syntax:

FromName.ControlName.Property = Value

Example:

Form1.Label.Caption = “Student Name:”

Form1.Label.Alignment = 1 Right justify


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The Text Box Control A control used for accepting user input, and

displaying text at the run-time.

Properties:

MaxLength: determines the maximum number of characters.(0:open).

Multiline: (True/False), enables word wrap.

Scrollbars: (0:no, 1:Horizontal, 2:Vertical, 3:Both), enables the user to scroll the text. Scrollbars related with multiline.


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Text Box Properties ..[CONT]• Locked: True/False

• Passwordchar: Determines the character that appears when the user enters a text.

• Text: Specifies the initial text that appears in the text box.

Note: No caption property for text box


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Text Box Events• Change: Occurs when the vale of the text

property is modified.

• Keypress, Keydown, Keyup….

Focus: The currently selected control.

• Gotfocus Event: Occurs when the control have the focus.

• Lostfocus:


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Command Button ControlA control that represents a button. The user

press or clicks to initiate an action.

Properties

• Caption: Specifies the text that appears in the button.When you precede a letter with &, that letter becomes the accelerator key.

• Default: (True/False). True:the button activates when ever the user press

<Enter>. Note only one can have this value on the form


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Command Button Properties [CONT]• Cancel: The same as default property, but

the button activates when you press <ESC>.

• Style: (0:Standard, 1:Graphical). Specifies whether the command button displays text or picture.

• Picture: Specifies a graphical image that appears on the command button.

Note:Picture property depends on style property.


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Command Button Properties [CONT]• Value: Run-Time property

When you set the value of the command button to True, the command button’s Click Event activates.

Example:

Command1.Value = True

Events:Click, Dbclick……..


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Lab TrainingExample I :

Design a VB project to perform the following:– Accept two numbers in text boxes.– Add two command buttons: Add, End– When you click Add, the result of addintion

should appear in a label control.– When you click End the program end.


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Lab Training

QuestionsQ1: Design a VB project to:

– Add two TextBoxes to the form.– Add three command buttons (Check, Refresh,End).– Accept any two numbers in the textboxes.– When you click the Check command button the

greatest number should appear in a label control.– When you click Refresh, all data should be removed

from the controls.– When you click End the program end execution.


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Lab TrainingQ2: The following is the price list and discount

policy for the telephone calls:Call Type Unit Price Discount-UnitsInternal 0.5 First 100 units Between cities 1.2 3% of units more

that 300External 1.8 5% of the units which

exceeds 100 unit.

Design a VB project to calculate the Telephone invoice. The interface should be as follow:


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Lab2 EndLab2 End

copyright 2003 : ismail m.romi, ppu. all rights reserved 1 lab2 managing controls

Documents

changing control properties

changing form properties

forms properties

form object

controls tools slide

common properties

properties types

selected control