Examples with TransitionListener android.animation.LayoutTransition.TransitionListener used on opensource projects

Example 6 with TransitionListener

use of android.animation.LayoutTransition.TransitionListener in project android_frameworks_base by ResurrectionRemix.

the class RenderSessionImpl method moveView.

/**
     * Moves a View from its current parent to a new given parent at a new given location, with
     * an optional new {@link LayoutParams} instance
     *
     * @param previousParent the previous parent, still owning the child at the time of the call.
     * @param newParent the new parent
     * @param movedView the view to move
     * @param index the new location in the new parent
     * @param params an option (can be null) {@link LayoutParams} instance.
     *
     * @return a Result with {@link Status#SUCCESS} or
     *     {@link Status#ERROR_VIEWGROUP_NO_CHILDREN} if the given parent doesn't support
     *     adding views.
     */
private Result moveView(ViewGroup previousParent, final ViewGroup newParent, final View movedView, final int index, final LayoutParams params) {
    try {
        // check if there is a transition on the previousParent.
        LayoutTransition previousTransition = previousParent.getLayoutTransition();
        if (previousTransition != null) {
            // in this case there is an animation. This means we have to wait for the child's
            // parent reference to be null'ed out so that we can add it to the new parent.
            // It is technically removed right before the DISAPPEARING animation is done (if
            // the animation of this type is not null, otherwise it's after which is impossible
            // to handle).
            // Because there is no move animation, if the new parent is the same as the old
            // parent, we need to wait until the CHANGE_DISAPPEARING animation is done before
            // adding the child or the child will appear in its new location before the
            // other children have made room for it.
            // add a listener to the transition to be notified of the actual removal.
            previousTransition.addTransitionListener(new TransitionListener() {

                private int mChangeDisappearingCount = 0;

                @Override
                public void startTransition(LayoutTransition transition, ViewGroup container, View view, int transitionType) {
                    if (transitionType == LayoutTransition.CHANGE_DISAPPEARING) {
                        mChangeDisappearingCount++;
                    }
                }

                @Override
                public void endTransition(LayoutTransition transition, ViewGroup container, View view, int transitionType) {
                    if (transitionType == LayoutTransition.CHANGE_DISAPPEARING) {
                        mChangeDisappearingCount--;
                    }
                    if (transitionType == LayoutTransition.CHANGE_DISAPPEARING && mChangeDisappearingCount == 0) {
                        // add it to the parentView in the correct location
                        if (params != null) {
                            newParent.addView(movedView, index, params);
                        } else {
                            newParent.addView(movedView, index);
                        }
                    }
                }
            });
            // remove the view from the current parent.
            previousParent.removeView(movedView);
            // and return since adding the view to the new parent is done in the listener.
            return SUCCESS.createResult();
        } else {
            // standard code with no animation. pretty simple.
            previousParent.removeView(movedView);
            // add it to the parentView in the correct location
            if (params != null) {
                newParent.addView(movedView, index, params);
            } else {
                newParent.addView(movedView, index);
            }
            return SUCCESS.createResult();
        }
    } catch (UnsupportedOperationException e) {
        // looks like this is a view class that doesn't support children manipulation!
        return ERROR_VIEWGROUP_NO_CHILDREN.createResult();
    }
}