Chapter 7 - Lists, loops and printing

List boxes and combo boxes• several types

• can add items at design time or during run time

• user select from predefined list or add new entry• simple combo boxes• dropdown combo boxes• dropdown lists• automatic scrolling

• No caption property

• prefixes: lst and cbo

• filling the list - properties window if not change• Ctrl-Enter to add to list

• AddItem method to add during run time• value and index

• Clearing the list - clear method• ListIndex Property - select an item or determine

which item selected when running - start with 0• ListCount - number in list• ListProperty - holds all elements in list -

referenced by index• ListCount - number in list

• Removing an item from the list - RemoveItem

Do/Loops• series of statements to be repeated

• iteration - single execution

• tested at the bottom or the top• pretest - at top• posttest - at bottom

• Boolean - true or false

• Using with list box

For/Next Loops - repeats a specific number of times• loop index - controls - numeric

• Step - incremented - default = 1

• Negative increment

• Condition satisfied before loop entered

• changing values in loop

• endless loops

• exiting

MsgBox function - display dialog box• function returns value

• specifiying buttons and/or icons to display

Using String functions• Left, right, mid to return part of a string

• Len - count• SelStart and SelLength

• Selecting entries in a list box - help user

Sending to the printer• printer.print• formatting lines

• commas - print zones - 14 spaces• semicolons - right after• blank lines• tab function - column position to start• spc function - number of spaces between• aligning string and numeric data

• selecting the font - TrueType fonts• terminating page or job - NewPage

• Printing contents of list box• printing selected item from list• aligning decimal columns

Assignment #13 Pg. 319 – define key terms - pg. 281 - prog. Exer. 7.2

• name everything appropriately

• option buttons - one frame

• drop down combo - subjects

• list box – shelf number

• Print – from form – can use picture box

• OK – button - default

• help, about - message box

• loop to print subjects - 0 to (list count – 1) printer.print - Printer.EndDoc

• to pick selected item from list - pg. 271

• hand in: printed output, code, form, form as text, design on paper