Visual Basic Controls ppt

Visual Basic Controls ppt

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  VISUAL BASIC CONTROLS Submittedby: RANJUMA SHUBHANGI S.MAMTA RUCHI YADAV Submitted to: PROF. VANI AGARWAL
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  PRESENTATION OUTLINES  INTRINSIC CONTROLS ACTIVEX CONTROLS  COMMON DIALOG CONTROLS
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  INTRINSIC CONTROL The visualtoolbox contains the tool we use to draw controls on your frames. intrinsic controls are one of them. It contain command button and frame controls. It include in the .exe file. Basic Controls are : • checkbox- displays a true/false or yes/no option. You can check any number of checkboxes on a form at one time. • Combo box- a textbox with a list box , allows user to type in a selection or select an item from a drop-down list. • Command button- carries out a command or action when user chooses it. Enables you to connect to an existing databases and display information from it on your forms. • Label- displays text a user cannot interact with or modify. • Listbox -displays a list of items that user can choose from .
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   Option button– the option button control , as part of an option group with other option buttons, displays multiple choices from which a user can choose only one.  Picture box- displays bitmap , icons or window metafiles, JPEG or GIF files. It also displays text or cats as a visual contains for other controls.  Textbox- provides an area to enter or display text.  Timer – Executes time events at specified time intervals.  OLE container – Enables data into a visual basic application.  Image – displays bitmaps , icons or window metafiles ,JPEG or GIF files, acts like a command button when clicked.  Scrollbar – allow user to add scroll bars to control that do not automatically provide them.  Frame – provides a visual and functional container for controls .
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   The mostuseful intrinsic controls these are nine intrinsic controls are pretty much used on every VB application .start your learning with these and then branch out . command button, image , checkbox, picture box , text box, list box ,label , combo box , option button.
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  STANDARD ACTIVEX CONTROLS TheLearning edition of Visual Basic contains a number of ActiveX controls (referred to as standard ActiveX controls) that allow you to add advanced features to your applications. ActiveX controls have the file name extension .ocx and can be used in your project by manually adding them to the toolbox. The following table summarizes the standard ActiveX controls available in the Learning edition of Visual Basic.
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  Icon Control name Class nameDescription ADO Data Control ADODC Creates a connection to a database using ADO. Assignable to the DataSource property of other controls such as the DataGrid. Common dialog CommonDialog Provides a standard set of dialog boxes for operations such as opening and saving files, setting print options, and selecting colors and fonts. DataCombo DataCombo Provides most of the features of the standard combo box control, plus increased data access capabilities. DataGrid DataGrid A grid control that allows can be data-bound to a data source such as the ADO Data Control. Reading and editing the recordset is possible. DataList DataList Provides most of the features of the standard list box control, plus increased data access capabilities. Microsoft Hierarchical FlexGrid MSHFlexGrid A read-only grid control that can be bound the Data Environment designer to show hierarchical recordsets.
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  OTHER CONTROLS Other ActiveXcontrols included with all versions of Visual Basic are documented in the Component Tools Guide, and include the following: ImageCombo, ImageList, ListView, ProgressBar, Slider, Statusbar, TabStrip, Toolbar, and TreeView.
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  ADDING AND REMOVINGACTIVEX CONTROLS You move ActiveX controls to and from the toolbox using the following procedures. To add an ActiveX control to the toolbox  From the Project menu, choose Components.  Select the check box next to the name of the .ocx control, and then choose OK. Once a control is placed in the toolbox, you can add it to a form just as you would an intrinsic control.
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  To remove anActiveX control  Remove all instances of the control from the forms in your project. Delete any references to the control in the project's code. If references to a deleted control are left in your code, an error message will display when you compile the application.  From the Project menu, choose Components.  Clear the check box next to the name of the .ocx control, and then choose OK. An error message will display if there are remaining instances of the control in your project.
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  COMMON DIALOG CONTROL: VB provides user facility of using in-built dialog boxes in application. Hence user is saved from the job of design his own dialog boxes. He has just to use common dialog control on form and call appropriate methods. Common dialog control is a special control. It provides its services to application but it need not to be displayed at form at run time.  Common dialog control is a component that allows us to access inbuilt libraries.  Common dialog control provides an interface between visual basic and the procedures in the Microsoft windows.
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  TO USE THECOMMON DIALOG CONTROL:  Add the common dialog control to the toolbox by selecting components from the project menu. Locate and select the control in the controls tabbed dialog, then click the OK button.  On the toolbox, click the common Dialog control and draw it on a form. When you draw a common dialog control on a form, it automatically resize itself. Like the timer control, this dialog is invisible at run time.
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  The common dialogcontrol allows you to display these commonly used dialog boxes:  Open  Save As  Color  Font  Print  Help
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   File openand file save common dialog control: File common dialog doesn’t display all files in any given folder normally. File display are limited to those recognized by application. Filter property determines the file to be displayed in File Open or File Save dialog box. DefaultExt property is used to specify the type of file to be displayed.  Color Common Dialog Control: It has single property color which returns color selected by user or sets initially selected color when dialog box opened.  Font common dialog box: It lets user select and view font, font size and style. Following attributes are set- Color, Font Bold, Font Italic, FontStrikethru, Font Underline, Font Name, Font Size.  Print Common Dialog Box: It enables user to select printer, set
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   Help commonDialog Control: Before using help common dialog box , user must have help files. These files either can be prepared by user or in-built.  To display common dialog box through code, its action property must be set. Method Action ShowOpen Displays open dialog box ShowSave Displays Save as dialog box ShowColor Displays Color dialog box ShowFont Displays Font dialog box ShowPrinter Displays Printer Dialog box ShowHelp Invokes Windows help engine