public interface GestureHandler
InputEvent
s.
To avoid negative impact on event processing, implementation shall restrict computation as much as possible and only within it's appropriate gesture states.
To allow custom user events, other than the normal InputEvent
s,
a user may return a GestureHandler.GestureEvent
in it's implementation.
Modifier and Type | Interface and Description |
---|---|
static class |
GestureHandler.GestureEvent
A custom gesture event
|
static interface |
GestureHandler.GestureListener
Listener for
GestureHandler.GestureEvent s. |
Modifier and Type | Field and Description |
---|---|
static boolean |
DEBUG |
Modifier and Type | Method and Description |
---|---|
void |
clear(boolean clearStarted)
Clears state of handler, i.e.
|
InputEvent |
getGestureEvent()
Returns the corresponding
InputEvent for the gesture as detected by
a previous process(InputEvent) , which has not been cleared . |
boolean |
hasGesture()
Returns true if a previous
process(InputEvent) command produced a gesture,
which has not been cleared . |
boolean |
isWithinGesture()
Returns true if within a gesture as detected by a previous
process(InputEvent) command,
which has not been cleared . |
boolean |
process(InputEvent e)
Process the given
InputEvent and returns true if it produced the gesture. |
void clear(boolean clearStarted)
clearStarted
- if true, also clears started
state,
otherwise stay within gesture - if appropriate.
Staying within a gesture allows fluent continuous gesture sequence,
e.g. for scrolling.boolean hasGesture()
process(InputEvent)
command produced a gesture,
which has not been cleared
.
Otherwise returns false.InputEvent getGestureEvent()
InputEvent
for the gesture as detected by
a previous process(InputEvent)
, which has not been cleared
.
Otherwise returns null.
Only implemented for gestures mapping to InputEvent
s.
boolean isWithinGesture()
process(InputEvent)
command,
which has not been cleared
.
Otherwise returns false.boolean process(InputEvent e)
InputEvent
and returns true if it produced the gesture.
Otherwise returns false.
If a gesture was already detected previously and has not been cleared, method does not process the event and returns true.
Besides validation of the event's details,
the handler may also validate the InputEvent.InputClass
and/or InputEvent.InputType
.
Copyright 2010 JogAmp Community.