Copyright 2003 : Ismail M.Romi, PPU. All Rights Reserved 1 Lab2 Managing Controls

Copyright 2003 : Ismail M.Romi, PPU. All Rights Reserved 2 Controls (Tools)

Copyright 2003 : Ismail M.Romi, PPU. All Rights Reserved 3 Properties Set 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.

Copyright 2003 : Ismail M.Romi, PPU. All Rights Reserved 4 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.

Copyright 2003 : Ismail M.Romi, PPU. All Rights Reserved 5 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.

Copyright 2003 : Ismail M.Romi, PPU. All Rights Reserved 6 The Form’s Properties See Page 68. 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.

Copyright 2003 : Ismail M.Romi, PPU. All Rights Reserved 7 Changing Form Properties at Run-Time Syntax: FormName.PropertyName = Value Examples: Form1.Caption = “ Student Record” Form1.Left = 0 Form1.MousePointer = vbHourglass Form1.MousePointer = 11

Copyright 2003 : Ismail M.Romi, PPU. All Rights Reserved 8 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.

Copyright 2003 : Ismail M.Romi, PPU. All Rights Reserved 9 The Pointer Tool The pointer tool is not a control. This tool used to deselect any selected control in the toolbox.

Copyright 2003 : Ismail M.Romi, PPU. All Rights Reserved 10 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.

Copyright 2003 : Ismail M.Romi, PPU. All Rights Reserved 11 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……...

Copyright 2003 : Ismail M.Romi, PPU. All Rights Reserved 12 Changing Control Properties at Run-Time Syntax: FromName.ControlName.Property = Value Example: Form1.Label.Caption = “Student Name:” Form1.Label.Alignment = 1 Right justify

Copyright 2003 : Ismail M.Romi, PPU. All Rights Reserved 13 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.

Copyright 2003 : Ismail M.Romi, PPU. All Rights Reserved 14 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

Copyright 2003 : Ismail M.Romi, PPU. All Rights Reserved 15 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:

Copyright 2003 : Ismail M.Romi, PPU. All Rights Reserved 16 Command Button Control A 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. Note only one can have this value on the form

Copyright 2003 : Ismail M.Romi, PPU. All Rights Reserved 17 Command Button Properties [CONT] Cancel: The same as default property, but the button activates when you press. 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.

Copyright 2003 : Ismail M.Romi, PPU. All Rights Reserved 18 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……..

Copyright 2003 : Ismail M.Romi, PPU. All Rights Reserved 19 Lab Training Example 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.

Copyright 2003 : Ismail M.Romi, PPU. All Rights Reserved 20 Lab Training Questions Q1: 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.

Copyright 2003 : Ismail M.Romi, PPU. All Rights Reserved 21 Lab Training Q2: The following is the price list and discount policy for the telephone calls: Call Type Unit Price Discount-Units Internal0.5 First 100 units Between cities 1.2 3% of units more that 300 External % of the units which exceeds 100 unit. Design a VB project to calculate the Telephone invoice. The interface should be as follow:

Copyright 2003 : Ismail M.Romi, PPU. All Rights Reserved 22

Copyright 2003 : Ismail M.Romi, PPU. All Rights Reserved 23 Lab2 End