1 Pertemuan 02 Visual Basic Environment and Control Matakuliah: D0524 / Algoritma dan Pemrograman Komputer Tahun: 2005 Versi:

2 Learning Outcomes Pada akhir pertemuan ini, diharapkan mahasiswa akan mampu : Menjelaskan lingkungan dan kontrol pada Visual Basic

3 Outline Materi Why Visual Basic Visual Basic Modes Visual Basic Controls Windows Form Control Button Control Label Control Textbox Control MsgBox Statement InputBox Function

4 Why Visual Basic Fastest and easiest way to create applications for Microsoft Windows –Complete set of tools which simplify the creation of the graphical user interface –Rapid prototyping tool Internet capabilities (VBScript language) It can be used as a tool to develop front- end applications for database systems Microsoft estimate that there are over 3 million VB developers world wide

5 Visual Basic Modes Design Mode –Placing, arranging, and customizing the appearance of buttons, labels, and other controls on a form. –Writing processing scripts (source code). –Saving the solution. –Making an executable file. Run Mode –Executes the solution. –Used to evaluate the workability of a part of the project. –Used to show the user how the solution will work. Break Mode –Helps the developer with debugging. –Enables the developer to switch back to run mode or design mode.

6 VB Integrated Development Environment (IDE) Tool box Tool bar Menu bar Properties Window Form layout window Project Explorer window Title bar Form Window

7 Visual Basic Controls Trigger: Initiate processing –Ex. Button, MainMenu, and Timer Input: Get data from user –Ex. TextBox, RadioButton, and CheckBox Output: Display results to user –Ex. Label, DataGrid, and ListView Organize: Group other controls –Ex. Form, GroupBox, and Panel Data Access: Interface with databases –Ex. Entire Data Group and DataGrid

8 Windows Form Control The window that is displayed when the application is running. The IDE automatically creates a Windows Form when you start a new project. This form will hold or “contain” other controls.

9 Button Control React to the click of the use Perform a task associated with the name of the button that is displayed on its face. Appearance and Use: –Appears as a rectangular-shaped control on a form. –Its face can display text, an image, or both. –The face of the button should clearly indicate its function. Properties: –The most common properties of the Button control are listed. –Most properties are available for every control. Events: –Components are able to respond to events. –The click event is generated when the user clicks the mouse button. –You write code to handle events. –Double-click the Button control to automatically open the code window.

10 Label Control Used to display information to the user. Used to label other controls or show results of a calculation. Appearance and Use: –Appears as a rectangular area that can be filled with text. –You have some control over size and alignment of text. –You can include a border around the label. Properties: –Many of the Button control properties apply to the Label control. –The Text Property is the most-used property for the Label control.

11 Textbox Control Provides an area for the user to type while the program runs. Appearance and Use: –Displays as a rectangular area that provides the user a place to type. –You can limit the user types –You can also surround the TextBox with a border. Properties: –Some of the TextBox control properties are only available at run time. –The value of the Text property is used most frequently. –Control of user entry is shared between properties and events. –The PasswordChar property allows you to set a security character. –TextLength property determines the number of characters contained in a textbox. –Selection… properties provide information on user selections in the TextBox control. Events: –Focus means the user is currently working with the specific control. Enter - Occurs when input focus is received. KeyPress - Occurs when a key is pressed while the control has focus. Leave – Occurs when input focus leaves the control. –Methods Enable the developer to manipulate text in a TextBox. Many are available to the developer.

12 MsgBox Statement The MsgBox statement will display information that requires user intervention. Example: –MsgBox("This is an example of a message box, please press OK to return to the application", vbDefaultButton1, "Message Box Sample")

13 Inputbox Function The InputBox() function requests information from the user with a dialog box. It requires user intervention. –InputBox("Enter a value", "InputBox Sample")