public ParallaxImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// Instantiate future objects
mTranslationMatrix = new Matrix();
mSensorInterpreter = new SensorInterpreter();
// Sets scale type
setScaleType(ScaleType.MATRIX);
// Set available attributes
if (attrs != null) {
final TypedArray customAttrs =
context.obtainStyledAttributes(attrs, R.styleable.ParallaxImageView);
if (customAttrs != null) {
if (customAttrs.hasValue(R.styleable.ParallaxImageView_intensity))
setParallaxIntensity(
customAttrs.getFloat(R.styleable.ParallaxImageView_intensity, mParallaxIntensity));
if (customAttrs.hasValue(R.styleable.ParallaxImageView_scaledIntensity))
setScaledIntensities(
customAttrs.getBoolean(
R.styleable.ParallaxImageView_scaledIntensity, mScaledIntensities));
if (customAttrs.hasValue(R.styleable.ParallaxImageView_tiltSensitivity))
setTiltSensitivity(
customAttrs.getFloat(
R.styleable.ParallaxImageView_tiltSensitivity,
mSensorInterpreter.getTiltSensitivity()));
if (customAttrs.hasValue(R.styleable.ParallaxImageView_forwardTiltOffset))
setForwardTiltOffset(
customAttrs.getFloat(
R.styleable.ParallaxImageView_forwardTiltOffset,
mSensorInterpreter.getForwardTiltOffset()));
customAttrs.recycle();
}
}
// Configure matrix as early as possible by posting to MessageQueue
post(
new Runnable() {
@Override
public void run() {
configureMatrix();
}
});
}
/**
* Sets the forward tilt offset dimension, allowing for the image to be centered while the phone
* is "naturally" tilted forwards.
*
* @param forwardTiltOffset the new tilt forward adjustment
*/
public void setForwardTiltOffset(float forwardTiltOffset) {
if (Math.abs(forwardTiltOffset) > 1)
throw new IllegalArgumentException(
"Parallax forward tilt offset must be less than or equal to 1.0");
mSensorInterpreter.setForwardTiltOffset(forwardTiltOffset);
}
@Override
public void onSensorChanged(SensorEvent event) {
final float[] vectors = mSensorInterpreter.interpretSensorEvent(getContext(), event);
// Return if interpretation of data failed
if (vectors == null) return;
// Set translation on ImageView matrix
setTranslate(vectors[2], vectors[1]);
}
/**
* Sets the parallax tilt sensitivity for the image view. The stronger the sensitivity, the more a
* given tilt will adjust the image and the smaller needed tilt to reach the image bounds.
*
* @param sensitivity the new tilt sensitivity
*/
public void setTiltSensitivity(float sensitivity) {
mSensorInterpreter.setTiltSensitivity(sensitivity);
}
