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Part II:
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The Java Library
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However, because of possible conflicts between the modifiers used by keyboard events and mouse events, and other issues, the following extended modifier values were added:
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ALT_DOWN_MASK ALT_GRAPH_DOWN_MASK BUTTON1_DOWN_MASK BUTTON2_DOWN_MASK BUTTON3_DOWN_MASK CTRL_DOWN_MASK META_DOWN_MASK SHIFT_DOWN_MASK
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When writing new code, it is recommended that you use the new, extended modifiers rather than the original modifiers To test if a modifier was pressed at the time an event is generated, use the isAltDown( ), isAltGraphDown( ), isControlDown( ), isMetaDown( ), and isShiftDown( ) methods The forms of these methods are shown here: boolean isAltDown( ) boolean isAltGraphDown( ) boolean isControlDown( ) boolean isMetaDown( ) boolean isShiftDown( ) You can obtain a value that contains all of the original modifier flags by calling the getModifiers( ) method It is shown here: int getModifiers( ) You can obtain the extended modifiers by calling getModifiersEx( ), which is shown here: int getModifiersEx( )
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The ItemEvent Class
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An ItemEvent is generated when a check box or a list item is clicked or when a checkable menu item is selected or deselected (Check boxes and list boxes are described later in this book) There are two types of item events, which are identified by the following integer constants:
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DESELECTED SELECTED The user deselected an item The user selected an item
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In addition, ItemEvent defines one integer constant, ITEM_STATE_CHANGED, that signifies a change of state ItemEvent has this constructor: ItemEvent(ItemSelectable src, int type, Object entry, int state) Here, src is a reference to the component that generated this event For example, this might be a list or choice element The type of the event is specified by type The specific item that generated the item event is passed in entry The current state of that item is in state The getItem( ) method can be used to obtain a reference to the item that generated an event Its signature is shown here: Object getItem( )
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22:
Event Handling
The getItemSelectable( ) method can be used to obtain a reference to the ItemSelectable object that generated an event Its general form is shown here: ItemSelectable getItemSelectable( ) Lists and choices are examples of user interface elements that implement the ItemSelectable interface The getStateChange( ) method returns the state change (that is, SELECTED or DESELECTED) for the event It is shown here: int getStateChange( )
The KeyEvent Class
A KeyEvent is generated when keyboard input occurs There are three types of key events, which are identified by these integer constants: KEY_PRESSED, KEY_RELEASED, and KEY_TYPED The first two events are generated when any key is pressed or released The last event occurs only when a character is generated Remember, not all keypresses result in characters For example, pressing SHIFT does not generate a character There are many other integer constants that are defined by KeyEvent For example, VK_0 through VK_9 and VK_A through VK_Z define the ASCII equivalents of the numbers and letters Here are some others:
VK_ALT VK_CANCEL VK_CONTROL VK_DOWN VK_ENTER VK_ESCAPE VK_LEFT VK_PAGE_DOWN VK_PAGE_UP VK_RIGHT VK_SHIFT VK_UP
The VK constants specify virtual key codes and are independent of any modifiers, such as control, shift, or alt KeyEvent is a subclass of InputEvent Here is one of its constructors: KeyEvent(Component src, int type, long when, int modifiers, int code, char ch) Here, src is a reference to the component that generated the event The type of the event is specified by type The system time at which the key was pressed is passed in when The modifiers argument indicates which modifiers were pressed when this key event occurred The virtual key code, such as VK_UP, VK_A, and so forth, is passed in code The character equivalent (if one exists) is passed in ch If no valid character exists, then ch contains CHAR_UNDEFINED For KEY_TYPED events, code will contain VK_UNDEFINED The KeyEvent class defines several methods, but the most commonly used ones are getKeyChar( ), which returns the character that was entered, and getKeyCode( ), which returns the key code Their general forms are shown here: char getKeyChar( ) int getKeyCode( ) If no valid character is available, then getKeyChar( ) returns CHAR_UNDEFINED When a KEY_TYPED event occurs, getKeyCode( ) returns VK_UNDEFINED
Part II:
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