com.uele.examples.splashscreenmvp.ui.view.behavior.FabBehavior.java Source code

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Here is the source code for com.uele.examples.splashscreenmvp.ui.view.behavior.FabBehavior.java

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/*
 * Copyright 2016 Brian Donaldson
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.uele.examples.splashscreenmvp.ui.view.behavior;

import android.content.Context;
import android.support.design.widget.FloatingActionButton;
import android.util.AttributeSet;

import android.os.Build;
import android.support.design.widget.CoordinatorLayout;
import android.support.v4.view.ViewCompat;
import android.support.v4.view.ViewPropertyAnimatorListener;
import android.support.v4.view.animation.FastOutSlowInInterpolator;
import android.view.View;
import android.view.ViewGroup;

import com.uele.examples.splashscreenmvp.ui.view.BetterFab;

public class FabBehavior extends FloatingActionButton.Behavior {

    public FabBehavior(Context context, AttributeSet attrs) {
        super();
    }

    private static final android.view.animation.Interpolator INTERPOLATOR = new FastOutSlowInInterpolator();
    private boolean mIsAnimatingOut = false;

    //if sdk < 14, just ignore because of min sdk is 14
    private void animateOut(final FloatingActionButton button) {
        if (Build.VERSION.SDK_INT >= 14) {
            int translationY = button.getHeight() + getMarginBottom(button);
            ViewCompat.animate(button).scaleX(0.0F).scaleY(0.0F).alpha(0.0F).translationY(translationY)
                    .setInterpolator(INTERPOLATOR).withLayer().setListener(new ViewPropertyAnimatorListener() {
                        public void onAnimationStart(View view) {
                            FabBehavior.this.mIsAnimatingOut = true;
                        }

                        public void onAnimationCancel(View view) {
                            FabBehavior.this.mIsAnimatingOut = false;
                        }

                        public void onAnimationEnd(View view) {
                            FabBehavior.this.mIsAnimatingOut = false;
                            view.setVisibility(View.GONE);
                        }
                    }).start();
        }
    }

    //if sdk < 14, just ignore because of min sdk is 14
    private void animateIn(FloatingActionButton button) {
        button.setVisibility(View.VISIBLE);
        if (Build.VERSION.SDK_INT >= 14) {
            ViewCompat.animate(button).scaleX(1.0F).scaleY(1.0F).alpha(1.0F).translationY(0)
                    .setInterpolator(INTERPOLATOR).withLayer().setListener(null).start();
        }
    }

    @Override
    public boolean onStartNestedScroll(CoordinatorLayout coordinatorLayout, FloatingActionButton child,
            View directTargetChild, View target, int nestedScrollAxes) {
        return nestedScrollAxes == ViewCompat.SCROLL_AXIS_VERTICAL
                || super.onStartNestedScroll(coordinatorLayout, child, directTargetChild, target, nestedScrollAxes);
    }

    @Override
    public void onNestedScroll(CoordinatorLayout coordinatorLayout, FloatingActionButton child, View target,
            int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed) {
        super.onNestedScroll(coordinatorLayout, child, target, dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed);
        boolean canAnimation = true;
        if (child instanceof BetterFab) {
            canAnimation = ((BetterFab) child).canAnimation();
        }
        if (!canAnimation)
            return;
        if (dyConsumed > 0 && !this.mIsAnimatingOut && child.getVisibility() == View.VISIBLE) {
            animateOut(child);
        } else if (dyConsumed < 0 && child.getVisibility() != View.VISIBLE) {
            animateIn(child);
        }
    }

    private int getMarginBottom(FloatingActionButton button) {
        int marginBottom = 0;
        final ViewGroup.LayoutParams layoutParams = button.getLayoutParams();
        if (layoutParams instanceof ViewGroup.MarginLayoutParams) {
            marginBottom = ((ViewGroup.MarginLayoutParams) layoutParams).bottomMargin;
        }
        return marginBottom;
    }
}