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);
}
Additional Resources:
- Learning to Write Java
- Introducing Java (TM) - Your First Applet
- Java FAQs
- Java Software
- java.sun.com
- Sun Microsystems
Event
Objects
Table of Contents
Exercise Eight
