eXtropia: the open web technology company
Technology | Support | Tutorials | Development | About Us | Users | Contact Us
Resources
 ::   Tutorials
 ::   Presentations
Perl & CGI tutorials
 ::   Intro to Perl/CGI and HTML Forms
 ::   Intro to Windows Perl
 ::   Intro to Perl 5
 ::   Intro to Perl
 ::   Intro to Perl Taint mode
 ::   Sherlock Holmes and the Case of the Broken CGI Script
 ::   Writing COM Components in Perl

Java tutorials
 ::   Intro to Java
 ::   Cross Browser Java

Misc technical tutorials
 ::   Intro to The Web Application Development Environment
 ::   Introduction to XML
 ::   Intro to Web Design
 ::   Intro to Web Security
 ::   Databases for Web Developers
 ::   UNIX for Web Developers
 ::   Intro to Adobe Photoshop
 ::   Web Programming 101
 ::   Introduction to Microsoft DNA

Misc non-technical tutorials
 ::   Misc Technopreneurship Docs
 ::   What is a Webmaster?
 ::   What is the open source business model?
 ::   Technical writing
 ::   Small and mid-sized businesses on the Web

Offsite tutorials
 ::   ISAPI Perl Primer
 ::   Serving up web server basics
 ::   Introduction to Java (Parts 1 and 2) in Slovak

 

Introduction to Web Programming
Event Modifiers  
  • Finally, the event's modifier field is used to tell what the state of the keyboard modifiers are when a mouse or key event occurs. The modifier's field may include any of the masks shown in the following table.

Event Mask Description
SHIFT_MASK the shift key is held down.
CTRL_MASK the control key is held down.
META_MASK the meta key is held down or the third mouse button is pressed.
ALT_MASK the alt key is held down.

  • As an example, if you want to know the state of the shift key when the mouse button is pressed, you can check the modifier's field as follows:

    public boolean handleEvent(Event event)
        {
        if (event.id == Event.MOUSE_DOWN)
            {
            if ((event.modifiers & Event.SHIFT_MASK) > 0)
                System.out.println("Shift is down during press");
            else
                System.out.println("Shift is up during press");
            }
        return super.handleEvent(event);
        }
    

Previous Page | Next Page