Visual Basic.NET How to Program (PDF)

520 Graphical User Interface Concepts: Part 1 Chapter 12
visual programming Windows Form
widget Xor
window gadget
SELF-REVIEW EXERCISES
12.1 State whether each of the following is true or false. If false, explain why.
a) The KeyData property includes data about modifier keys.
b) Windows Forms commonly are used to create GUIs.
c) A form is an example of a container.
d) All forms, components and controls are classes.
e) Events are based on properties.
f) A Label displays text that the user can edit.
g) Button presses generate events.
h) Checkboxes in the same group are mutually exclusive.
i) All mouse events use the same event arguments class.
j) Visual Studio can register an event and create an empty event handler.
12.1 Fill in the blanks in each of the following statements:
a) The active control is said to have the .
b) The form acts as a for the controls that are added.
c) GUIs are driven.
d) Every method that handles the same event must have the same .
e) The information required when registering an event handler is the class and
the .
f) A(n) textbox masks user input with another character.
g) Class and class help arrange controls on a GUI and provide logical
groups for radio buttons.
h) Typical mouse events include , and .
i) events are generated when a key on the keyboard is pressed or released.
j) The modifier keys are , and .
k) A(n) event or delegate can call multiple methods.
ANSWERS TO SELF-REVIEW EXERCISES
12.1 a) True. b) True. c) False. A control is a visible component. d) True. e) False. Events are
based on delegates. f) False. A Label‘s text cannot be edited by the user. g) True. h) False. Radio
buttons in the same group are mutually exclusive. i) False. Some mouse events use EventArgs, others
MouseEventArgs. j) True.
12.2 a) focus. b) container. c) event. d) signature. e) event arguments, delegate. f) password.
g) GroupBox, Panel. h) mouse clicks, mouse presses, mouse moves. i) Key. j) Shift, Control, Alt.
k) multicast.
EXERCISES
12.2 Extend the program in Fig. 12.24 to include a CheckBox for every font style option. [Hint:
Use Xor rather than testing for every bit explicitly.]
12.3 Create the following GUI: