ScaleGestureDetector Class

Definition

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
ScaleGestureDetector
Attributes

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

ScaleGestureDetector(Context, ScaleGestureDetector+IOnScaleGestureListener)

Creates a ScaleGestureDetector with the supplied listener.

ScaleGestureDetector(Context, ScaleGestureDetector+IOnScaleGestureListener, Handler)

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

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 (Inherited from Object)
JniPeerMembers
PeerReference (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. -or- 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. -or- Sets whether the associates OnScaleGestureListener should receive onScale callbacks when the user uses a stylus and presses the button.

ThresholdClass

This API supports the Mono for Android infrastructure and is not intended to be used directly from your code.

ThresholdType

This API supports the Mono for Android infrastructure and is not intended to be used directly from your code.

TimeDelta

Return the time difference in milliseconds between the previous accepted scaling event and the current scaling event.

Methods

Clone()

Creates and returns a copy of this object.

(Inherited from Object)
Dispose() (Inherited from Object)
Dispose(Boolean) (Inherited from Object)
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)
ToArray<T>() (Inherited from Object)
ToString()

Returns a string representation of the object.

(Inherited from Object)
UnregisterFromRuntime() (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)

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, 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)

Explicit Interface Implementations

IJavaPeerable.Disposed() (Inherited from Object)
IJavaPeerable.DisposeUnlessReferenced() (Inherited from Object)
IJavaPeerable.Finalized() (Inherited from Object)
IJavaPeerable.JniManagedPeerState (Inherited from Object)
IJavaPeerable.SetJniIdentityHashCode(Int32) (Inherited from Object)
IJavaPeerable.SetJniManagedPeerState(JniManagedPeerStates) (Inherited from Object)
IJavaPeerable.SetPeerReference(JniObjectReference) (Inherited from Object)

Extension Methods

JavaCast<TResult>(IJavaObject)

Performs an Android runtime-checked type conversion.

JavaCast<TResult>(IJavaObject)
GetJniTypeName(IJavaPeerable)

Applies to