PhoneTabSwitcherLayout.java 文件源码

/**
 * Starts a peek animation to add a specific tab.
 *
 * @param item
 *         The item, which corresponds to the tab, which should be added, as an instance of the
 *         class {@link AbstractItem}. The item may not be null
 * @param duration
 *         The duration of the animation in milliseconds as a {@link Long} value
 * @param interpolator
 *         The interpolator, which should be used by the animation, as an instance of the type
 *         {@link Interpolator}. The interpolator may not be null
 * @param peekPosition
 *         The position on the dragging axis, the tab should be moved to, in pixels as a {@link
 *         Float} value
 * @param peekAnimation
 *         The peek animation, which has been used to add the tab, as an instance of the class
 *         {@link PeekAnimation}. The peek animation may not be null
 */
private void animatePeek(@NonNull final AbstractItem item, final long duration,
                         @NonNull final Interpolator interpolator, final float peekPosition,
                         @NonNull final PeekAnimation peekAnimation) {
    PhoneTabViewHolder viewHolder = (PhoneTabViewHolder) ((TabItem) item).getViewHolder();
    viewHolder.closeButton.setVisibility(View.GONE);
    View view = item.getView();
    float x = peekAnimation.getX();
    float y = peekAnimation.getY() + tabTitleContainerHeight;
    FrameLayout.LayoutParams layoutParams = (FrameLayout.LayoutParams) view.getLayoutParams();
    view.setAlpha(1f);
    getArithmetics().setPivot(Axis.X_AXIS, item, x);
    getArithmetics().setPivot(Axis.Y_AXIS, item, y);
    view.setX(layoutParams.leftMargin);
    view.setY(layoutParams.topMargin);
    getArithmetics().setScale(Axis.DRAGGING_AXIS, item, 0);
    getArithmetics().setScale(Axis.ORTHOGONAL_AXIS, item, 0);
    ViewPropertyAnimator animation = view.animate();
    animation.setInterpolator(interpolator);
    animation.setListener(
            new AnimationListenerWrapper(createPeekAnimationListener(item, peekAnimation)));
    animation.setStartDelay(0);
    animation.setDuration(duration);
    getArithmetics().animateScale(Axis.DRAGGING_AXIS, animation, 1);
    getArithmetics().animateScale(Axis.ORTHOGONAL_AXIS, animation, 1);
    getArithmetics().animatePosition(Axis.DRAGGING_AXIS, animation, item, peekPosition, true);
    animation.start();
    int selectedTabIndex = getModel().getSelectedTabIndex();
    TabItem selectedItem = TabItem.create(getModel(), tabViewRecycler, selectedTabIndex);
    tabViewRecycler.inflate(selectedItem);
    selectedItem.getTag().setPosition(0);
    PhoneTabViewHolder selectedTabViewHolder =
            (PhoneTabViewHolder) selectedItem.getViewHolder();
    selectedTabViewHolder.closeButton.setVisibility(View.GONE);
    animateShowSwitcher(selectedItem, duration, interpolator,
            createZoomOutAnimationListener(selectedItem, peekAnimation));
}