MenuAnimationHandler.java

/*
 *   Copyright 2014 Oguz Bilgener
 */
package com.cpacm.library.animation;

import android.animation.Animator;
import android.graphics.Point;
import android.view.ViewGroup;
import android.widget.FrameLayout;

import com.cpacm.library.FloatingActionMenu;

/**
 * An abstract class that is a prototype for the actual animation handlers
 */
public abstract class MenuAnimationHandler {

    // There are only two distinct animations at the moment.
    protected enum ActionType {OPENING, CLOSING}

    protected FloatingActionMenu menu;

    public MenuAnimationHandler() {
    }

    public void setMenu(FloatingActionMenu menu) {
        this.menu = menu;
    }

    /**
     * Starts the opening animation
     * Should be overriden by children
     * @param center
     */
    public void animateMenuOpening(Point center) {
        if(menu == null) {
            throw new NullPointerException("MenuAnimationHandler cannot animate without a valid FloatingActionMenu.");
        }

    }

    /**
     * Ends the opening animation
     * Should be overriden by children
     * @param center
     */
    public void animateMenuClosing(Point center) {
        if(menu == null) {
            throw new NullPointerException("MenuAnimationHandler cannot animate without a valid FloatingActionMenu.");
        }
    }

    /**
     * Restores the specified sub action view to its final state, accoding to the current actionType
     * Should be called after an animation finishes.
     * @param subActionItem
     * @param actionType
     */
    protected void restoreSubActionViewAfterAnimation(FloatingActionMenu.Item subActionItem, ActionType actionType) {
        FrameLayout.LayoutParams params = (FrameLayout.LayoutParams) subActionItem.view.getLayoutParams();
        subActionItem.view.setTranslationX(0);
        subActionItem.view.setTranslationY(0);
        subActionItem.view.setRotation(0);
        subActionItem.view.setScaleX(1);
        subActionItem.view.setScaleY(1);
        subActionItem.view.setAlpha(1);
        if(actionType == ActionType.OPENING) {
            //与父视图的边框距离，只要设置左上两个方位就能确定位置
            params.setMargins(subActionItem.x, subActionItem.y, 0, 0);
            subActionItem.view.setLayoutParams(params);
        }
        else if(actionType == ActionType.CLOSING) {
            Point center = menu.getActionViewCenter();
            params.setMargins(center.x - subActionItem.width / 2, center.y - subActionItem.height / 2, 0, 0);
            subActionItem.view.setLayoutParams(params);
            ((ViewGroup) menu.getActivityContentView()).removeView(subActionItem.view);
        }
    }

    /**
     * A special animation listener that is intended to listen the last of the sequential animations.
     * Changes the animating property of children.
     */
    public class LastAnimationListener implements Animator.AnimatorListener {

        @Override
        public void onAnimationStart(Animator animation) {
            setAnimating(true);
        }

        @Override
        public void onAnimationEnd(Animator animation) {
            setAnimating(false);
        }

        @Override
        public void onAnimationCancel(Animator animation) {
            setAnimating(false);
        }

        @Override
        public void onAnimationRepeat(Animator animation) {
            setAnimating(true);
        }
    }

    public abstract boolean isAnimating();
    protected abstract void setAnimating(boolean animating);
}