Introducing Untyped Listeners : SWT Event « SWT « Java Tutorial

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Java Tutorial » SWT » SWT Event

17. 89. 6. Introducing Untyped Listeners

The untyped listener interface is represented by the Listener interface
It contains one method: void handleEvent(Event event)

Event Members

Member	Description
int button	The one-based index of the button that was clicked or released.
char character	The character that was typed.
int count	The number of pending paint events.
Object data	Application-specific data.
int detail	A detail constant from the SWT class that contains details about the event.
Display display	The display where the event occurred.
boolean doit	A flag indicating whether to process this event. Not supported for all events.
int end	The end of the range of modified text.
GC gc	The graphics context associated with this event.
int height	The height in pixels of the rectangle that needs painting.
Widget item	The widget where the event occurred.
int keyCode	The key code of the key that was typed.
int start	The beginning of the range of modified text.
int stateMask	The mask describing the state of the modifier keys at the time of the event.
String text	The text to insert.
int time	The event's time.
int type	The type of the event. This is the field to switch on to handle the various event types.
Widget widget	The widget that issued the event.
int width	The width in pixels of the rectangle that needs painting.
int x	Either the x offset of the rectangle that needs painting or the x coordinate of the mouse pointer at the time of the event, depending n the event.
int y	Either the y offset of the rectangle that needs painting or the y coordinate of the mouse pointer at the time of the event, depending on the event.

To add an untyped listener to a widget, call addListener() on it.


void addListener(int eventType, Listener listener)

eventType contains one of the event type constants from the SWT class:

Type	Description
SWT.Activate	Triggered when the widget becomes the active window
SWT.Arm	Triggered when the widget is armed
SWT.Close	Triggered when the widget is closed
SWT.Collapse	Triggered when a tree node is collapsed
SWT.Deactivate	Triggered when the widget is no longer the active window
SWT.DefaultSelection	Triggered when the default selection occurs
SWT.Deiconify	Triggered when the widget is restored from being minimized
SWT.Dispose	Triggered when the widget is disposed
SWT.DragDetect	Triggered when the widget is dragged
SWT.Expand	Triggered when a tree node is expanded
SWT.FocusIn	Triggered when the widget gains focus
SWT.FocusOut	Triggered when the widget loses focus
SWT.HardKeyDown	Triggered when a special hardware key, such as on a Pocket PC device, is pressed
SWT.HardKeyUp	Triggered when a special hardware key, such as on a Pocket PC device, is released
SWT.Help	Triggered when the user requests help
SWT.Hide	Triggered when the widget is hidden
SWT.Iconify	Triggered when the widget is minimized
SWT.KeyDown	Triggered when the user presses a key
SWT.KeyUp	Triggered when the user releases a key
SWT.MenuDetect	Triggered when a menu is selected
SWT.Modify	Triggered when the text of a widget is modified
SWT.MouseDoubleClick	Triggered when the mouse is double-clicked
SWT.MouseDown	Triggered when the mouse button is clicked
SWT.MouseEnter	Triggered when the mouse pointer enters the widget
SWT.MouseExit	Triggered when the mouse pointer exits the widget
SWT.MouseHover	Triggered when the mouse pointer hovers over the widget
SWT.MouseMove	Triggered when the mouse pointer moves through the widget
SWT.MouseUp	Triggered when the mouse button is released
SWT.Move	Triggered when the widget is moved
SWT.None	Null event
SWT.Paint	Triggered when the widget is painted
SWT.Resize	Triggered when the widget is resized
SWT.Selection	Triggered when the widget is selected
SWT.Show	Triggered when the widget is shown
SWT.Traverse	Triggered when the user tabs through the controls
SWT.Verify	Triggered when the text for the widget is about to change, allowing you to veto the change

17. 89. SWT Event
	17. 89. 1.	Events
	17. 89. 2.	The Event Model
	17. 89. 3.	The listener notification process
	17. 89. 4.	SWT provides two kinds of event listening mechanism: typed and untyped.
	17. 89. 5.	Untyped Events and Untyped Event Listeners
	17. 89. 6.	Introducing Untyped Listeners
	17. 89. 7.	Get event type
	17. 89. 8.	implements general Event Listener
	17. 89. 9.	Introducing Typed Listeners
	17. 89. 10.	Typed Listeners
	17. 89. 11.	SWT Message Keys and Values
	17. 89. 12.	Using SelectionListener
	17. 89. 13.	Add Resize listener to Shell
	17. 89. 14.	Add addPaintListener to Composite
	17. 89. 15.	Add default selection listener to Combo
	17. 89. 16.	Using HelpListener
	17. 89. 17.	Demonstrate DisposeListener which is notified on the associated widget's disposal
	17. 89. 18.	Using ControlListener
	17. 89. 19.	Using FocusListener
	17. 89. 20.	Using VerifyListener
	17. 89. 21.	Using ModifyListener
	17. 89. 22.	Adding AccessibleListener
	17. 89. 23.	Adding AccessibleControlListener
	17. 89. 24.	Add and remove filter listeners

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