ScaleGestureDetector Class

Definition

Namespace:: Android.Views

Assembly:: Mono.Android.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Detects scaling transformation gestures using the supplied MotionEvents.

[Android.Runtime.Register("android/view/ScaleGestureDetector", DoNotGenerateAcw=true)]
public class ScaleGestureDetector : Java.Lang.Object

[<Android.Runtime.Register("android/view/ScaleGestureDetector", DoNotGenerateAcw=true)>]
type ScaleGestureDetector = class
    inherit Object

Inheritance: Object

JavaObject

Object
ScaleGestureDetector

Attributes: RegisterAttribute

Remarks

Detects scaling transformation gestures using the supplied MotionEvents. The OnScaleGestureListener callback will notify users when a particular gesture event has occurred.

This class should only be used with MotionEvents reported via touch.

To use this class: <ul> <li>Create an instance of the ScaleGestureDetector for your View<li>In the View#onTouchEvent(MotionEvent) method ensure you call #onTouchEvent(MotionEvent). The methods defined in your callback will be executed when the events occur. </ul>

Java documentation for android.view.ScaleGestureDetector.

Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License.

Constructors

Name	Description
ScaleGestureDetector(Context, ScaleGestureDetector+IOnScaleGestureListener, Handler)	Creates a ScaleGestureDetector with the supplied listener.
ScaleGestureDetector(Context, ScaleGestureDetector+IOnScaleGestureListener)	Creates a ScaleGestureDetector with the supplied listener.
ScaleGestureDetector(IntPtr, JniHandleOwnership)	A constructor used when creating managed representations of JNI objects; called by the runtime.

Properties

Name	Description
Class	Returns the runtime class of this `Object`. (Inherited from Object)
CurrentSpan	Return the average distance between each of the pointers forming the gesture in progress through the focal point.
CurrentSpanX	Return the average X distance between each of the pointers forming the gesture in progress through the focal point.
CurrentSpanY	Return the average Y distance between each of the pointers forming the gesture in progress through the focal point.
EventTime	Return the event time of the current event being processed.
FocusX	Get the X coordinate of the current gesture's focal point.
FocusY	Get the Y coordinate of the current gesture's focal point.
Handle	The handle to the underlying Android instance. (Inherited from Object)
IsInProgress	Returns `true` if a scale gesture is in progress.
JniIdentityHashCode	Gets the identity hash code assigned to this Java peer by the interop runtime. (Inherited from Object)
JniManagedPeerState	(Inherited from JavaObject)
JniPeerMembers	Gets the JNI peer metadata used by the .NET for Android binding runtime.
PeerReference	Gets the JNI object reference for this Java peer. (Inherited from Object)
PreviousSpan	Return the previous average distance between each of the pointers forming the gesture in progress through the focal point.
PreviousSpanX	Return the previous average X distance between each of the pointers forming the gesture in progress through the focal point.
PreviousSpanY	Return the previous average Y distance between each of the pointers forming the gesture in progress through the focal point.
QuickScaleEnabled	Return whether the quick scale gesture, in which the user performs a double tap followed by a swipe, should perform scaling.; Set whether the associated `OnScaleGestureListener` should receive onScale callbacks when the user performs a doubleTap followed by a swipe.
ScaleFactor	Return the scaling factor from the previous scale event to the current event.
StylusScaleEnabled	Return whether the stylus scale gesture, in which the user uses a stylus and presses the button, should perform scaling.; Sets whether the associated `OnScaleGestureListener` should receive onScale callbacks when the user uses a stylus and presses the button.
ThresholdClass	Gets the JNI class handle used by the .NET for Android binding runtime.
ThresholdType	Gets the managed type used by the .NET for Android binding runtime.
TimeDelta	Return the time difference in milliseconds between the previous accepted scaling event and the current scaling event.

Methods

Name	Description
Clone()	Creates and returns a copy of this object. (Inherited from Object)
Construct(JniObjectReference, JniObjectReferenceOptions)	(Inherited from JavaObject)
Dispose()	Releases the resources held by this Java peer. (Inherited from Object)
Dispose(Boolean)	Releases the resources held by this Java peer. (Inherited from Object)
DisposeUnlessReferenced()	(Inherited from JavaObject)
Equals(Object)	(Inherited from JavaObject)
Equals(Object)	Indicates whether some other object is "equal to" this one. (Inherited from Object)
GetHashCode()	Returns a hash code value for the object. (Inherited from Object)
JavaFinalize()	Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. (Inherited from Object)
Notify()	Wakes up a single thread that is waiting on this object's monitor. (Inherited from Object)
NotifyAll()	Wakes up all threads that are waiting on this object's monitor. (Inherited from Object)
OnTouchEvent(MotionEvent)	Accepts MotionEvents and dispatches events to a `OnScaleGestureListener` when appropriate.
SetHandle(IntPtr, JniHandleOwnership)	Sets the Handle property. (Inherited from Object)
SetPeerReference(JniObjectReference, JniObjectReferenceOptions)	(Inherited from JavaObject)
ToArray<T>()	Creates a managed array from this Java array wrapper. (Inherited from Object)
ToString()	Returns a string representation of the object. (Inherited from Object)
UnregisterFromRuntime()	Unregisters this Java peer from the interop runtime. (Inherited from Object)
Wait()	Causes the current thread to wait until it is awakened, typically by being <em>notified</em> or <em>interrupted</em>. (Inherited from Object)
Wait(Int64, Int32)	Causes the current thread to wait until it is awakened, typically by being <em>notified</em> or <em>interrupted</em>, or until a certain amount of real time has elapsed. (Inherited from Object)
Wait(Int64)	Causes the current thread to wait until it is awakened, typically by being <em>notified</em> or <em>interrupted</em>, or until a certain amount of real time has elapsed. (Inherited from Object)

Explicit Interface Implementations

Name	Description
IJavaPeerable.Disposed()	(Inherited from JavaObject)
IJavaPeerable.Finalized()	(Inherited from JavaObject)
IJavaPeerable.JniObjectReferenceControlBlock	(Inherited from JavaObject)
IJavaPeerable.SetJniIdentityHashCode(Int32)	(Inherited from JavaObject)
IJavaPeerable.SetJniManagedPeerState(JniManagedPeerStates)	(Inherited from JavaObject)
IJavaPeerable.SetPeerReference(JniObjectReference)	(Inherited from JavaObject)

Extension Methods

Name	Description
GetJniTypeName(IJavaPeerable)	Gets the JNI name of the type of the instance `self`.
JavaAs<TResult>(IJavaPeerable)	Try to coerce `self` to type `TResult`, checking that the coercion is valid on the Java side.
JavaCast<TResult>(IJavaObject)	Performs an Android runtime-checked type conversion.
JavaCast<TResult>(IJavaObject)
TryJavaCast<TResult>(IJavaPeerable, TResult)	Try to coerce `self` to type `TResult`, checking that the coercion is valid on the Java side.

Applies to