eXtropia | Tutorials | Introducton to Web Programming

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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);
    }

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