1. Graphical User Interfaces Part 2
Outline Introduction Menus LinkLabels

2. Continues study of Graphical User Interface Explores:
Introduction
Continues study of Graphical User Interface
Explores:
Menus
LinkLabels

3. Menus Menu Disabled command Separator bar Checked menu item
Shortcut key
Menu
submenu
Disabled command
Separator bar
Checked menu item
Expanded and checked menus.

4. Group related commands together Contain:
Menus
Group related commands together
Contain:
Commands
Submenus
Some commends, such as Exit are common to many applications and uses Application class to quit
To create a menu
drag a MenuStrip control onto form.
Creates a menu bar on top of the form and an icon beneath it
Click the icon Menu Designer
Every option has its own event handler

5. Menus Place & character before the letter to be underlined
Text boxes used to add items to menu
Menu Designer
MainMenu icon
Visual Studio .NET Menu Designer.

6. Menus Default Event MenuStrip Properties Menu Item Properties
MenuItems
RightToLeft
Menu Item Properties
Text
Index (position in parent list)
ShortCutKeys and ShowShortCutKeys
MenuItems (for a submenu)
Checked (according to property RadioCheck - default is false)
MergeAction (Append, Insert, Remove and Replace)
MergeIndex(set position of menu item when menus are merged)
Default Event
Click – generated when item is clicked or shortcut key is used

8. 11 public class MenuTest : System.Windows.Forms.Form 12 {
12 {
// display label
private System.Windows.Forms.Label displayLabel; 15
// main menu (contains file and format menu)
private System.Windows.Forms.MainMenu mainMenu; 18
// file menu
private System.Windows.Forms.MenuItem fileMenuItem;
private System.Windows.Forms.MenuItem aboutMenuItem;
private System.Windows.Forms.MenuItem exitMenuItem; 23
// format menu
private System.Windows.Forms.MenuItem formatMenuItem; 26
// color submenu
private System.Windows.Forms.MenuItem colorMenuItem;
private System.Windows.Forms.MenuItem blackMenuItem;
private System.Windows.Forms.MenuItem blueMenuItem;
private System.Windows.Forms.MenuItem redMenuItem;
private System.Windows.Forms.MenuItem greenMenuItem;
options

9. private void aboutMenuItem_Click( object sender, System.EventArgs e )
// display MessageBox
private void aboutMenuItem_Click(
object sender, System.EventArgs e ) {
MessageBox.Show(
"This is an example\nof using menus.",
"About", MessageBoxButtons.OK,
MessageBoxIcon.Information ); }
// exit program
private void exitMenuItem_Click(
Application.Exit();
About event handler
Exit event Handler

10. private void ClearColor() { // clear all checkmarks
// reset color
private void ClearColor() {
// clear all checkmarks
blackMenuItem.Checked = false;
blueMenuItem.Checked = false;
redMenuItem.Checked = false;
greenMenuItem.Checked = false; }
// update menu state and color display black
private void blackMenuItem_Click(
object sender, System.EventArgs e )
// reset checkmarks for color menu items
ClearColor();
// set color to black
displayLabel.ForeColor = Color.Black;
blackMenuItem.Checked = true;
Black event handler

11. Displays links to other objects
LinkLabels
Displays links to other objects
Uses event handlers to link to right file or program
Start method of Process class opens other programs
Derived from class Label, inherits functionality

12. LinkLabels LinkLabel on a form
Hand image displayed when mouse cursor over a LinkLabel
LinkLabel control in the design phase and in running program.

13. LinkLabels Properties Event Text
LinkArea – portion of text treated as link
LinkBehavior – how link appears when mouse is over it
LinkColor (before visit - default is blue)
ActiveLinkColor (when link clicked – default is red)
VisitedLinkColor (default is purple)
LinkVisited
Links (lists the LinkLabel.Link objects)
Event
LinkClicked (default)

14. Click on first LinkLabel to look at contents of C drive

15. Click on second LinkLabel to go to the Web Site

16. Click the third LinkLabel to open notepad

17. public partial class LinkLabelTest : Form {
// linklabels to C: drive, and Notepad
private System.Windows.Forms.LinkLabel driveLinkLabel;
private System.Windows.Forms.LinkLabel deitelLinkLabel;
private System.Windows.Forms.LinkLabel notepadLinkLabel;
// browse C:\ drive
private void driveLinkLabel_LinkClicked( object sender,
System.Windows.Forms.LinkLabelLinkClickedEventArgs e )
driveLinkLabel.LinkVisited = true;
System.Diagnostics.Process.Start( "C:\\" ); }
C drive link
Deitel website link
Notepad link
C drive event handler
Start method to open other programs

18. // load www.deitel.com in Web broswer
private void deitelLinkLabel_LinkClicked( object sender,
System.Windows.Forms.LinkLabelLinkClickedEventArgs e ) {
deitelLinkLabel.LinkVisited = true;
System.Diagnostics.Process.Start(
"IExplore", " ); }
// run application Notepad
private void notepadLinkLabel_LinkClicked(
object sender,
notepadLinkLabel.LinkVisited = true;
// program called as if in run
// menu and full path not needed
System.Diagnostics.Process.Start( "notepad" );
Deitel website event handler
Notepad event handler