Example usage for android.animation TypeEvaluator TypeEvaluator

Introduction

In this page you can find the example usage for android.animation TypeEvaluator TypeEvaluator.

Prototype

TypeEvaluator

Source Link

Usage

From source file:net.osmand.plus.views.controls.DynamicListView.java

/**
 * Resets all the appropriate fields to a default state while also animating
 * the hover cell back to its correct location.
 *//*from www . ja v  a  2s  .c  o m*/
private void touchEventsEnded() {
    final View mobileView = getViewForID(mMobileItemId);
    if (mCellIsMobile || mIsWaitingForScrollFinish) {
        mCellIsMobile = false;
        mIsWaitingForScrollFinish = false;
        mIsMobileScrolling = false;
        mActivePointerId = INVALID_POINTER_ID;

        // If the autoscroller has not completed scrolling, we need to wait for it to
        // finish in order to determine the final location of where the hover cell
        // should be animated to.
        if (mScrollState != OnScrollListener.SCROLL_STATE_IDLE) {
            mIsWaitingForScrollFinish = true;
            return;
        }

        mHoverCellCurrentBounds.offsetTo(mHoverCellOriginalBounds.left, mobileView.getTop());

        if (android.os.Build.VERSION.SDK_INT < 12) {
            finishTouch();
        } else {
            /**
             * This TypeEvaluator is used to animate the BitmapDrawable back to its
             * final location when the user lifts his finger by modifying the
             * BitmapDrawable's bounds.
             */
            TypeEvaluator<Rect> sBoundEvaluator = new TypeEvaluator<Rect>() {
                public Rect evaluate(float fraction, Rect startValue, Rect endValue) {
                    return new Rect(interpolate(startValue.left, endValue.left, fraction),
                            interpolate(startValue.top, endValue.top, fraction),
                            interpolate(startValue.right, endValue.right, fraction),
                            interpolate(startValue.bottom, endValue.bottom, fraction));
                }

                public int interpolate(int start, int end, float fraction) {
                    return (int) (start + fraction * (end - start));
                }
            };

            ObjectAnimator hoverViewAnimator = ObjectAnimator.ofObject(mHoverCell, "bounds", sBoundEvaluator,
                    mHoverCellCurrentBounds);
            hoverViewAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
                @Override
                public void onAnimationUpdate(ValueAnimator valueAnimator) {
                    invalidate();
                }
            });
            hoverViewAnimator.addListener(new AnimatorListenerAdapter() {
                @Override
                public void onAnimationStart(Animator animation) {
                    setEnabled(false);
                }

                @Override
                public void onAnimationEnd(Animator animation) {
                    finishTouch();
                }
            });
            hoverViewAnimator.start();
        }
    } else {
        touchEventsCancelled();
    }
}

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