public class ScaleGestureDetector
extends java.lang.Object
Modifier and Type | Class and Description |
---|---|
static interface |
ScaleGestureDetector.OnScaleGestureListener
The listener for receiving notifications when gestures occur.
|
static class |
ScaleGestureDetector.SimpleOnScaleGestureListener
A convenience class to extend when you only want to listen for a subset
of scaling-related events.
|
Constructor and Description |
---|
ScaleGestureDetector(android.content.Context context,
ScaleGestureDetector.OnScaleGestureListener listener) |
Modifier and Type | Method and Description |
---|---|
float |
getCurrentSpan()
Return the average distance between each of the pointers forming the
gesture in progress through the focal point.
|
float |
getCurrentSpanX()
Return the average X distance between each of the pointers forming the
gesture in progress through the focal point.
|
float |
getCurrentSpanY()
Return the average Y distance between each of the pointers forming the
gesture in progress through the focal point.
|
long |
getEventTime()
Return the event time of the current event being processed.
|
float |
getFocusX()
Get the X coordinate of the current gesture's focal point.
|
float |
getFocusY()
Get the Y coordinate of the current gesture's focal point.
|
float |
getPreviousSpan()
Return the previous average distance between each of the pointers forming the
gesture in progress through the focal point.
|
float |
getPreviousSpanX()
Return the previous average X distance between each of the pointers forming the
gesture in progress through the focal point.
|
float |
getPreviousSpanY()
Return the previous average Y distance between each of the pointers forming the
gesture in progress through the focal point.
|
float |
getScaleFactor()
Return the scaling factor from the previous scale event to the current
event.
|
long |
getTimeDelta()
Return the time difference in milliseconds between the previous
accepted scaling event and the current scaling event.
|
boolean |
isInProgress()
Returns
true if a scale gesture is in progress. |
boolean |
onTouchEvent(android.view.MotionEvent event)
Accepts MotionEvents and dispatches events to a
ScaleGestureDetector.OnScaleGestureListener
when appropriate. |
public ScaleGestureDetector(android.content.Context context, ScaleGestureDetector.OnScaleGestureListener listener)
public boolean onTouchEvent(android.view.MotionEvent event)
ScaleGestureDetector.OnScaleGestureListener
when appropriate.
Applications should pass a complete and consistent event stream to this method. A complete and consistent event stream involves all MotionEvents from the initial ACTION_DOWN to the final ACTION_UP or ACTION_CANCEL.
event
- The event to processpublic boolean isInProgress()
true
if a scale gesture is in progress.public float getFocusX()
isInProgress()
would return false, the result of this
function is undefined.public float getFocusY()
isInProgress()
would return false, the result of this
function is undefined.public float getCurrentSpan()
public float getCurrentSpanX()
public float getCurrentSpanY()
public float getPreviousSpan()
public float getPreviousSpanX()
public float getPreviousSpanY()
public float getScaleFactor()
getCurrentSpan()
/ getPreviousSpan()
).public long getTimeDelta()
public long getEventTime()