PhoneTabSwitcherLayout.java 文件源码

/**
 * Animates the position and size of a specific tab in order to show the tab switcher.
 *
 * @param tabItem
 *         The tab item, which should be animated, as an instance of the class {@link TabItem}.
 *         The tab 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 listener
 *         The listener, which should be notified about the animation's progress, as an instance
 *         of the type {@link AnimatorListener} or null, if no listener should be notified
 */
private void animateShowSwitcher(@NonNull final TabItem tabItem, final long duration,
                                 @NonNull final Interpolator interpolator,
                                 @Nullable final AnimatorListener listener) {
    View view = tabItem.getView();
    FrameLayout.LayoutParams layoutParams = (FrameLayout.LayoutParams) view.getLayoutParams();
    view.setX(layoutParams.leftMargin);
    view.setY(layoutParams.topMargin);
    getArithmetics().setScale(Axis.DRAGGING_AXIS, view, 1);
    getArithmetics().setScale(Axis.ORTHOGONAL_AXIS, view, 1);
    getArithmetics().setPivot(Axis.DRAGGING_AXIS, view,
            getArithmetics().getPivot(Axis.DRAGGING_AXIS, view, DragState.NONE));
    getArithmetics().setPivot(Axis.ORTHOGONAL_AXIS, view,
            getArithmetics().getPivot(Axis.ORTHOGONAL_AXIS, view, DragState.NONE));
    float scale = getArithmetics().getScale(view, true);
    int selectedTabIndex = getModel().getSelectedTabIndex();

    if (tabItem.getIndex() < selectedTabIndex) {
        getArithmetics().setPosition(Axis.DRAGGING_AXIS, view,
                getArithmetics().getTabContainerSize(Axis.DRAGGING_AXIS));
    } else if (tabItem.getIndex() > selectedTabIndex) {
        getArithmetics().setPosition(Axis.DRAGGING_AXIS, view,
                getTabSwitcher().getLayout() == Layout.PHONE_LANDSCAPE ? 0 :
                        layoutParams.topMargin);
    }

    if (tabViewBottomMargin == -1) {
        tabViewBottomMargin = calculateBottomMargin(view);
    }

    animateBottomMargin(view, tabViewBottomMargin, duration, 0);
    ViewPropertyAnimator animation = view.animate();
    animation.setDuration(duration);
    animation.setInterpolator(interpolator);
    animation.setListener(new AnimationListenerWrapper(listener));
    getArithmetics().animateScale(Axis.DRAGGING_AXIS, animation, scale);
    getArithmetics().animateScale(Axis.ORTHOGONAL_AXIS, animation, scale);
    getArithmetics().animatePosition(Axis.DRAGGING_AXIS, animation, view,
            tabItem.getTag().getPosition(), true);
    getArithmetics().animatePosition(Axis.ORTHOGONAL_AXIS, animation, view, 0, true);
    animation.setStartDelay(0);
    animation.start();
}