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public
static
class
ScaleGestureDetector.SimpleOnScaleGestureListener
extends Object
implements
ScaleGestureDetector.OnScaleGestureListener
java.lang.Object | |
↳ | android.view.ScaleGestureDetector.SimpleOnScaleGestureListener |
A convenience class to extend when you only want to listen for a subset
of scaling-related events. This implements all methods in
OnScaleGestureListener
but does nothing.
OnScaleGestureListener#onScale(ScaleGestureDetector)
returns
false
so that a subclass can retrieve the accumulated scale
factor in an overridden onScaleEnd.
OnScaleGestureListener#onScaleBegin(ScaleGestureDetector)
returns
true
.
Public constructors | |
---|---|
SimpleOnScaleGestureListener()
|
Public methods | |
---|---|
boolean
|
onScale(ScaleGestureDetector detector)
Responds to scaling events for a gesture in progress. |
boolean
|
onScaleBegin(ScaleGestureDetector detector)
Responds to the beginning of a scaling gesture. |
void
|
onScaleEnd(ScaleGestureDetector detector)
Responds to the end of a scale gesture. |
Inherited methods | |
---|---|
public SimpleOnScaleGestureListener ()
public boolean onScale (ScaleGestureDetector detector)
Responds to scaling events for a gesture in progress. Reported by pointer motion.
Parameters | |
---|---|
detector |
ScaleGestureDetector : The detector reporting the event - use this to
retrieve extended info about event state. |
Returns | |
---|---|
boolean |
Whether or not the detector should consider this event as handled. If an event was not handled, the detector will continue to accumulate movement until an event is handled. This can be useful if an application, for example, only wants to update scaling factors if the change is greater than 0.01. |
public boolean onScaleBegin (ScaleGestureDetector detector)
Responds to the beginning of a scaling gesture. Reported by new pointers going down.
Parameters | |
---|---|
detector |
ScaleGestureDetector : The detector reporting the event - use this to
retrieve extended info about event state. |
Returns | |
---|---|
boolean |
Whether or not the detector should continue recognizing this gesture. For example, if a gesture is beginning with a focal point outside of a region where it makes sense, onScaleBegin() may return false to ignore the rest of the gesture. |
public void onScaleEnd (ScaleGestureDetector detector)
Responds to the end of a scale gesture. Reported by existing
pointers going up.
Once a scale has ended, ScaleGestureDetector#getFocusX()
and ScaleGestureDetector#getFocusY()
will return focal point
of the pointers remaining on the screen.
Parameters | |
---|---|
detector |
ScaleGestureDetector : The detector reporting the event - use this to
retrieve extended info about event state. |