wt.clients.dndMicroApplet
Class SimpleDragGestureRecognizer

java.lang.Object
  java.awt.dnd.DragGestureRecognizer
      java.awt.dnd.MouseDragGestureRecognizer
          wt.clients.dndMicroApplet.SimpleDragGestureRecognizer

All Implemented Interfaces:

EventListener, MouseListener, MouseMotionListener, Serializable

final class SimpleDragGestureRecognizer

extends MouseDragGestureRecognizer

Extends MouseDragGestureRecognizer to make it more responsive to mouse drags. Default implementations require the mouse to be moved by at least 5 pixels, but this often fails for small Java applets and quick drag motions. We thus recognize any and all drags instead.

Note that this class signals drag source support for all standard drag actions (move, copy, and link) and selects the starting action based on the Windows modifiers keys on all platforms.

Field Summary

private static int

MODIFIER_MASK Bitmask union of shift and control modifiers

Fields inherited from class java.awt.dnd.MouseDragGestureRecognizer

Fields inherited from class java.awt.dnd.DragGestureRecognizer

component, dragGestureListener, dragSource, events, sourceActions

Constructor Summary

private

SimpleDragGestureRecognizer(DragSource dragSource, Component component, DragGestureListener listener) Private constructor which allows all drag actions

Method Summary

private int	getDragOperationFromModifiers(MouseEvent e) Determine initial drag action from event modifiers.
void	mouseDragged(MouseEvent e) If the event list was started and not cleared, then a drag gesture is recognized (regardless of the amount of mouse motion involved).
void	mouseEntered(MouseEvent e) No further possibility of drag gesture in progress -- clear event list.
void	mouseExited(MouseEvent e) No further possibility of drag gesture in progress -- clear event list.
void	mousePressed(MouseEvent e) Restarts drag gesture event list as this is a potential trigger event.
void	mouseReleased(MouseEvent e) No further possibility of drag gesture in progress -- clear event list.
(package private) static void	register(Component component, DragGestureListener listener) Constructs an instance of this class with the given component and listener.

Methods inherited from class java.awt.dnd.MouseDragGestureRecognizer

mouseClicked, mouseMoved, registerListeners, unregisterListeners

Methods inherited from class java.awt.dnd.DragGestureRecognizer

addDragGestureListener, appendEvent, fireDragGestureRecognized, getComponent, getDragSource, getSourceActions, getTriggerEvent, removeDragGestureListener, resetRecognizer, setComponent, setSourceActions

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

MODIFIER_MASK

private static final int MODIFIER_MASK

Bitmask union of shift and control modifiers

See Also:

Constant Field Values

Constructor Detail

SimpleDragGestureRecognizer

private SimpleDragGestureRecognizer(DragSource dragSource,
                                    Component component,
                                    DragGestureListener listener)

Private constructor which allows all drag actions

Method Detail

register

static void register(Component component,
                     DragGestureListener listener)

Constructs an instance of this class with the given component and listener. This registers this recognizer with the given component and the listener with the recognizer.

mousePressed

public void mousePressed(MouseEvent e)

Restarts drag gesture event list as this is a potential trigger event. Ignores pop-up menu trigger events.

mouseReleased

public void mouseReleased(MouseEvent e)

No further possibility of drag gesture in progress -- clear event list.

mouseEntered

public void mouseEntered(MouseEvent e)

No further possibility of drag gesture in progress -- clear event list.

mouseExited

public void mouseExited(MouseEvent e)

No further possibility of drag gesture in progress -- clear event list.

mouseDragged

public void mouseDragged(MouseEvent e)

If the event list was started and not cleared, then a drag gesture is recognized (regardless of the amount of mouse motion involved).

getDragOperationFromModifiers

private int getDragOperationFromModifiers(MouseEvent e)

Determine initial drag action from event modifiers. Note that this determination is based on that done on the Windows platform, but is a bit more forgiving (as Windows will not recognize a shift-drag as a drag gesture).