/** Handles reset button click. */
private void onZoomResetButtonClick() {
// resets image view scale and translation and makes it fit in screen's center
mPinchToZoomTransformation.reset();
updateImageView();
updateZoomTextViewText();
scaleTv(0, mImageViewWidth / 2.0f, mImageViewHeight / 2.0f);
}
/** Updates application UI and image on TV according to scale values. */
private float getCurrentScale() {
RectF imageRect = mPinchToZoomTransformation.getRect();
float imageViewRatio = (float) mImageViewWidth / mImageViewHeight;
float imageRatio = imageRect.width() / imageRect.height();
return imageViewRatio < imageRatio
? imageRect.width() / mImageViewWidth
: imageRect.height() / mImageViewHeight;
}
/**
* Initializes mPinchToZoomTransformation.
*
* <p>After initialization subsequent calls will be ignored.
*
* <p>Must be called after Android finished layout measurements and after drawable was set on
* ImageView.
*/
private void initialize() {
if (mPinchToZoomTransformation == null
&& mImageView != null
&& mImageView.getDrawable() != null) {
int imageWidth = mImageView.getDrawable().getIntrinsicWidth();
int imageHeight = mImageView.getDrawable().getIntrinsicHeight();
mImageViewWidth = mImageView.getMeasuredWidth();
mImageViewHeight = mImageView.getMeasuredHeight();
mPinchToZoomTransformation =
new PinchToZoomTransformation(imageWidth, imageHeight, mImageViewWidth, mImageViewHeight);
mPinchToZoomTransformation.setMaxScale(5);
mImageView.setScaleType(ImageView.ScaleType.MATRIX);
mPinchToZoomTransformation.setScaleToFitInCenter();
updateImageView();
}
}
/** Updates application UI and image on TV according to rotation values. */
private void updateUiAndTvRotation(RotationDirection rotationDirection) {
PinchToZoomTransformation.RotationDirection pinchToZoomRotationDirection =
rotationDirection == RotationDirection.CLOCKWISE
? PinchToZoomTransformation.RotationDirection.CLOCKWISE
: PinchToZoomTransformation.RotationDirection.COUNTER_CLOCKWISE;
mPinchToZoomTransformation.updateRotationAndFitInBounds(pinchToZoomRotationDirection);
updateImageView();
scaleTv(0, mImageViewWidth / 2.0f, mImageViewHeight / 2.0f);
updateZoomTextViewText();
}
/** Updates application UI and image on TV according to scale values. */
private void updateUiAndTvScale(float scaleFactorDelta, float scalePointX, float scalePointY) {
// rounds scale values so that they are the same as those accepted by ViewController
float roundedScaleFactorDelta = (float) ((int) (scaleFactorDelta * 100)) / 100;
float roundedScalePointX = (int) scalePointX;
float roundedScalePointY = (int) scalePointY;
// applies rounded scale to transformation object
// additionally the scale that was applied after bounds check is stored in newScaleFactorDelta
float newScaleFactorDelta =
mPinchToZoomTransformation.updateScaleInBounds(
roundedScaleFactorDelta, roundedScalePointX, roundedScalePointY);
updateImageView();
scaleTv(newScaleFactorDelta, roundedScalePointX, roundedScalePointY);
updateZoomTextViewText();
}
/** Abstracts call to ViewController.zoom() method. */
private void scaleTv(float scaleFactorDelta, float scalePointX, float scalePointY) {
if (mAllShareService.isImageReady()) {
int tvScalePointX = (int) scalePointX;
int tvScalePointY = (int) scalePointY;
int tvScaleFactorDelta = (int) (scaleFactorDelta * 100);
int rotation = mPinchToZoomTransformation.getRotation();
mAllShareService
.getViewController()
.zoom(
tvScalePointX,
tvScalePointY,
tvScaleFactorDelta,
rotation,
mImageViewWidth,
mImageViewHeight);
}
}
/** Updates ImageView with current transformation. */
private void updateImageView() {
mImageView.setImageMatrix(mPinchToZoomTransformation.getMatrix());
mImageView.invalidate();
}
