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2. User Interface Design Chapter 2 2 McGraw-Hill© 2006 The McGraw-Hill Companies, Inc. All rights reserved.

3. 2-3 Objectives (1 of 2) Use text boxes, group boxes, check boxes, radio button, and picture boxes effectively Set the BorderStyle property to make controls appear flat or three-dimensional Select multiple controls and move them, align them, and set common properties Make your projects easy for the user to understand and operate by defining access keys, setting an accept and a cancel button, controlling the tab sequence, resetting the focus during program execution, and causing ToolTips to appear

4. 2-4 Objectives (2 of 2) Clear the contents of text boxes and labels. Change text color during program execution. Code multiple statements for one control using the With and End With statements. Concatenate (join) strings of text. Make a control visible or invisible at run time by setting its Visible property.

5. User Interface 2-5

6. 2-6 Designing the User Interface The design of the screen should be easy to understand and “comfortable” for the user. The best way to accomplish these goals is to follow industry standards for the color, size, and placement of controls. To the user the Interface should be Familiar Comfortable Organized – group controls Sans Serif Fonts are best, not boldface or large Gray is a neutral color that works well Keyboard Accessible

7. 2-7 Text Box Allows for user input Text property What is displayed in text box What user entered in text box TextAlign property Controls alignment of text in the text box

8. 2-8 Masked Text Box A specialized form of the Text Box You can specify the format (the Mask property) of the data required of the user For example, you can select a mask for a ZIP code, a date, a phone number, or a social security number At run time the user cannot enter characters that do not conform to the mask

9. 2-9 Group Box Used as containers for other controls such as radio buttons and check boxes Improves readability of form by separating the controls into logical groups Example Names for Group Boxes colorGroupBox styleGroupBox

10. 2-10 Check Box Allows the user to select or deselect one or more items in any group Checked property Checked = True Unchecked = False Use the Text property for the text you want to appear next to the box Example names for Check Boxes boldCheckBox italicCheckBox

11. 2-11 Radio Button User may select only one in any group First create a group box and then create each radio button inside the group box Checked property Selected = True Unselected = False Text property What is displayed next to the radio button Example Names for Radio Buttons redRadioButton blueRadioButton

12. 2-12 Picture Box Displays/contains an image Image property Complete path and filename of graphic; it’s a good idea to place the graphic into the folder with your project before it is assigned to a picture box Can set extension to.bmp,.gif,.jpg,.jpeg,.png,.ico,.emf,.wmf PictureBox controls have several useful properties such as the SizeMode property StretchImage causes picture to be resized to match the size of the control or the Visible property which can be set to False to make the picture disappear

13. 2-13 Borders and Styles Most controls can appear to be three-dimensional or flat Labels, text boxes, and pictures boxes all have a BorderStyle property with different style choices including: None FixedSingle Fixed3D properties can be changed to the style of choosing

14. 2-14 Drawing a Line A line can be drawn on a form by using the Label control Lines can be used in logos or dividing the screen To create the look of a line set the following properties: Text=blank BorderStyle=None BackColor=desired line color Width and Height, located beneath the Size property as desired A line can also be drawn on a form using the graphics methods which is discussed in Chapter 13

15. 2-15 Selecting Multiple Controls There are several methods of selecting multiple controls which means controls can be moved as a group Shift-Click or Ctrl-Click to select/deselect multiple controls Use the mouse to drag a selection box around multiple controls When wanting to select most of the controls on the form used a combination of the two methods To deselect all selected controls click elsewhere on the form (1of 2)

16. 2-16 Selecting Multiple Controls (2 of 2) Use the mouse to drag a selection box around multiple controls When multiple controls are selected, each has resizing handles (if resizable)

17. 2-17 Working with Multiple Controls What are some of the benefits of working with Multiple Controls? Drag a group of selected controls to move the entire group to a new location at one time Set common properties Use Format Menu or Layout Toolbar to Align controls to each other Make controls the same size Modify the spacing between controls

18. 2-18 Keyboard Access Keys Many people prefer to use the keyboard, rather than a mouse, for most operations Also referred to as Hot Keys Underlined Letter User presses Alt + underlined letter Use Windows-Standard Keys Defined using Text property Text=&OK Text=E&xit

19. 2-19 Accept & Cancel Buttons Accept Button Identified visually on Form by its darker outline Responds to Enter key Form's AcceptButton property Cancel Button Form's CancelButton property An example of a Cancel button is the Esc key

20. 2-20 Setting the Tab Order for Controls (1 of 2) One control on a Form always has the focus Not all control types can receive the focus Text boxes, buttons - focus Picture boxes and labels – no focus TabStop property is applicable only for controls that are capable of receiving the focus Designates whether a control is allowed to receive the focus; set to True or False TabIndex property determines the order the focus moves as the Tab key is pressed

21. 2-21 Setting the Tab Order for Controls (2 of 2) Users should be able to use the Tab key to move the focus through a form in an organized manner; top to bottom, left to right TabIndex property Number in tab sequence 0 for first control to receive the focus when the form loads Use View Menu, Tab Order to set

22. 2-22 Setting the TabIndex Property With the Design window active, select View / Tab Order or click the Tab Order button on the Layout toolbar Click on each control in sequence to set TabIndex property of controls automatically

23. 2-23 Setting the Form's Screen Location You can set the form’s screen position by setting the StartPositionproperty of the form To center a form on the user’s screen, set the StartPosition property to CenterScreen

24. 2-24 Creating ToolTips Small label that is displayed when user pauses mouse pointer over a control Add a ToolTip Control to Form The new control appears in a new pane, Component Tray that opens at the bottom of the Form Designer After you add the component to your form, each of the form’s controls has a new property Select ToolTip on ToolTip1 property of each control and add Tool Tip comments

25. 2-25 ToolTip Control Component Tray

26. 2-26 nameTextBox.Text = "" messageLabel.Text = "" dataTextBox.Clear( ) messageLabel.Text = String.Empty Clearing Text Boxes & Labels Set Text property equal to an Empty String Empty String is 2 quotation marks with no space between them ("") Use the Clear Method of a Text Box or set Text property to String.Empty

27. 2-27 nameTextBox.Focus( ) Resetting the Focus Places the Insertion Point in a Text Box Use the Focus Method

28. 2-28 redRadioButton.Checked = True displayCheckBox.Checked = False Setting the Checked Property of Radio Buttons and Check Boxes Selects/Deselects Check Box or Radio Button at design or run time Set Checked property True = Checked, selected False = Unchecked, deselected

29. 2-29 Setting Visibility at Run Time Make label invisible messageLabel.Visible = False

30. 2-30 Changing the Color of Text ForeColor and BackColor Properties Use VB Color Constants from the Color Class Type the keyword Color and a period in the editor to view a full color list nameTextBox.ForeColor = Color.Red messageLabel.ForeColor = Color.White

31. 2-31 Changing Multiple Properties of a Control There are times when you will want to change several properties of a single control Previous to version 4 the entire name (Object, Property) for each statement had to be written, such as: titleTextBox.Visible = True titleTextBox.ForeColor = Color.White titleTextBox.Focus() Now VB provides With and End With statements

32. 2-32 With titleTextBox.Visible = True.ForeColor = Color.White. Focus( ) End With With and End With Change several properties at once in Code Will run more efficiently

33. 2-33 messageLabel.Text = " Your name is: " & nameTextBox.Text nameAndAddressLabel.Text = nameTextBox.Text & addressTextBox.Text Concatenation Think of concatenation as "tacking" text strings together Use an ampersand (&) preceded and followed by a space between the two strings

34. 2-34 greetingsLabel.Text = " Greetings " & nameTextBox.Text & " : " & _ " You have been selected to win a free prize. " & _ " Just send us $100 for postage and handling. " Continuing Long Program Lines For long lines of code it is more readable to continue them on the next line At the end of the line use a Line Continuation Character (a Space, an Underscore and press Enter)

35. Problem Definition (1) Create a program that will allow a user to enter their name and a message. When the user clicks the Display button, the user’s name and message should be concatenated then displayed in a message label. The user can change the color the displayed text by selecting the appropriate radio button. The displaying of the message can be suppressed by unchecking the show/hide check box. 2-35

36. Problem Definition (2) Provide appropriate access keys (Hot Keys), appropriate tooltips, ability to clear the text boxes and output message in order to start over, and an Exit button. Establish the Display button as the Accept button and the Exit button as the Cancel button. A logo will be placed on the form and when clicked, it will toggle between the large and small version. Send focus to the appropriate objects as required. 2-36

37. Chapter 3: Program Design and Coding 37 OIP OUTPUT User’s name and message Change color of message Change size of Logo Display tooltips INPUT Name Message Select color Select Logo size Select/Hide message PROCESS Concatenate user name and message Display user’s name and message Change color of message Display/Hide message Send focus to clear button Send focus to name textbox Clear input and output Change size of logo Reset defaults Exit program

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39. Chapter 3: Program Design and Coding 39 OEA (1) OBJECTEVENTTASK(S) Exit buttonClickExit program Display buttonClickConcatenate user’s name and message Display User’s name and message Send focus to clear button Color radio button(s) CheckedChangedChange color of message label Display check box CheckedChanged Set the visible property to show or hide message label

40. Chapter 3: Program Design and Coding 40 OEA (2) OBJECTEVENTTASK(S) Clear button Click Clear input and output Reset defaults Send focus to name textbox Large logo picture box Click Hide large picture box Show small picture box Small logo picture box Click Hide small picture box Show large picture box