com.nbmap.android.gestures

Class StandardScaleGestureDetector

java.lang.Object

com.nbmap.android.gestures.BaseGesture<L>

com.nbmap.android.gestures.MultiFingerGesture<L>

com.nbmap.android.gestures.ProgressiveGesture<StandardScaleGestureDetector.StandardOnScaleGestureListener>

com.nbmap.android.gestures.StandardScaleGestureDetector

public class StandardScaleGestureDetector
extends ProgressiveGesture<StandardScaleGestureDetector.StandardOnScaleGestureListener>

Gesture detector handling scale gesture.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	StandardScaleGestureDetector.SimpleStandardOnScaleGestureListener
static interface	StandardScaleGestureDetector.StandardOnScaleGestureListener Listener for scale gesture callbacks.

Field Summary

Fields inherited from class com.nbmap.android.gestures.BaseGesture

context, listener, windowManager

Constructor Summary

Constructors

Constructor and Description
StandardScaleGestureDetector(android.content.Context context, AndroidGesturesManager androidGesturesManager)

Method Summary

Modifier and Type	Method and Description
protected boolean	analyzeEvent(android.view.MotionEvent motionEvent)
protected boolean	analyzeMovement()
protected void	gestureStopped()
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.
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.
protected int	getRequiredPointersCount()
float	getScaleFactor()
float	getSpanSinceStartThreshold() Get the threshold span in pixels between initial fingers position and current needed for this detector to qualify it as a scale gesture.
float	getStartSpan() Return the average distance between each of the pointers forming the gesture in progress through the focal point, when the gesture was started.
float	getStartSpanX() Return the average X distance between each of the pointers forming the gesture in progress through the focal point, when the gesture was started.
float	getStartSpanY() Return the average Y distance between each of the pointers forming the gesture in progress through the focal point, when the gesture was started.
boolean	isScalingOut() Check whether user is scaling out.
protected boolean	isSloppyGesture() Check if we have a sloppy gesture.
protected java.util.Set<java.lang.Integer>	provideHandledTypes()
protected void	reset()
void	setSpanSinceStartThreshold(float spanSinceStartThreshold) Set the threshold span in pixels between initial fingers position and current needed for this detector to qualify it as a scale gesture.
void	setSpanSinceStartThresholdResource(int spanSinceStartThresholdDimen) Set the threshold span in dp between initial fingers position and current needed for this detector to qualify it as a scale gesture.

Methods inherited from class com.nbmap.android.gestures.ProgressiveGesture

gestureStarted, interrupt, isInProgress, setEnabled

Methods inherited from class com.nbmap.android.gestures.MultiFingerGesture

canExecute, getCurrentSpan, getCurrentSpanX, getCurrentSpanY, getFocalPoint, getPointersCount, getPreviousSpan, getPreviousSpanX, getPreviousSpanY, getSpanThreshold, setSpanThreshold, setSpanThresholdResource

Methods inherited from class com.nbmap.android.gestures.BaseGesture

getCurrentEvent, getGestureDuration, getPreviousEvent, isEnabled, onTouchEvent, removeListener, setListener

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

StandardScaleGestureDetector

public StandardScaleGestureDetector(android.content.Context context,
                                    AndroidGesturesManager androidGesturesManager)

Method Detail

analyzeMovement

protected boolean analyzeMovement()

Overrides:

analyzeMovement in class MultiFingerGesture<StandardScaleGestureDetector.StandardOnScaleGestureListener>

gestureStopped

protected void gestureStopped()

Overrides:

gestureStopped in class ProgressiveGesture<StandardScaleGestureDetector.StandardOnScaleGestureListener>

reset

protected void reset()

Overrides:

reset in class MultiFingerGesture<StandardScaleGestureDetector.StandardOnScaleGestureListener>

analyzeEvent

protected boolean analyzeEvent(android.view.MotionEvent motionEvent)

Overrides:

analyzeEvent in class ProgressiveGesture<StandardScaleGestureDetector.StandardOnScaleGestureListener>

getRequiredPointersCount

protected int getRequiredPointersCount()

Overrides:

getRequiredPointersCount in class MultiFingerGesture<StandardScaleGestureDetector.StandardOnScaleGestureListener>

isSloppyGesture

protected boolean isSloppyGesture()

Description copied from class: MultiFingerGesture

Check if we have a sloppy gesture. Sloppy gestures can happen if the edge of the user's hand is touching the screen, for example.

Thanks to Almer Thie (code.almeros.com).

Overrides:

isSloppyGesture in class MultiFingerGesture<StandardScaleGestureDetector.StandardOnScaleGestureListener>

Returns:

true if we detect sloppy gesture, false otherwise

provideHandledTypes

protected java.util.Set<java.lang.Integer> provideHandledTypes()

Specified by:

provideHandledTypes in class ProgressiveGesture<StandardScaleGestureDetector.StandardOnScaleGestureListener>

isScalingOut

public boolean isScalingOut()

Check whether user is scaling out.

Returns:

true if user is scaling out, false if user is scaling in

getSpanSinceStartThreshold

public float getSpanSinceStartThreshold()

Get the threshold span in pixels between initial fingers position and current needed for this detector to qualify it as a scale gesture.

Returns:

span threshold

setSpanSinceStartThreshold

public void setSpanSinceStartThreshold(float spanSinceStartThreshold)

Set the threshold span in pixels between initial fingers position and current needed for this detector to qualify it as a scale gesture.

We encourage to set those values from dimens to accommodate for various screen sizes.

Parameters:

spanSinceStartThreshold - delta span threshold

setSpanSinceStartThresholdResource

public void setSpanSinceStartThresholdResource(int spanSinceStartThresholdDimen)

Set the threshold span in dp between initial fingers position and current needed for this detector to qualify it as a scale gesture.

Parameters:

spanSinceStartThresholdDimen - delta span threshold

getScaleFactor

public float getScaleFactor()

Returns:

Scale factor.

getStartSpan

public float getStartSpan()

Return the average distance between each of the pointers forming the gesture in progress through the focal point, when the gesture was started.

Returns:

Distance between pointers in pixels.

getStartSpanX

public float getStartSpanX()

Return the average X distance between each of the pointers forming the gesture in progress through the focal point, when the gesture was started.

Returns:

Distance between pointers in pixels.

getStartSpanY

public float getStartSpanY()

Return the average Y distance between each of the pointers forming the gesture in progress through the focal point, when the gesture was started.

Returns:

Distance between pointers in pixels.

getCurrentSpan

public float getCurrentSpan()

Return the average distance between each of the pointers forming the gesture in progress through the focal point.

Returns:

Distance between pointers in pixels.

getCurrentSpanX

public float getCurrentSpanX()

Return the average X distance between each of the pointers forming the gesture in progress through the focal point.

Returns:

Distance between pointers in pixels.

getCurrentSpanY

public float getCurrentSpanY()

Return the average Y distance between each of the pointers forming the gesture in progress through the focal point.

Returns:

Distance between pointers in pixels.

getPreviousSpan

public float getPreviousSpan()

Return the previous average distance between each of the pointers forming the gesture in progress through the focal point.

Returns:

Previous distance between pointers in pixels.

getPreviousSpanX

public float getPreviousSpanX()

Return the previous average X distance between each of the pointers forming the gesture in progress through the focal point.

Returns:

Previous distance between pointers in pixels.

getPreviousSpanY

public float getPreviousSpanY()

Return the previous average Y distance between each of the pointers forming the gesture in progress through the focal point.

Returns:

Previous distance between pointers in pixels.