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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 package com.android.messaging.ui;
     17 
     18 import android.view.Gravity;
     19 import android.view.View;
     20 import android.view.ViewPropertyAnimator;
     21 
     22 import com.google.common.base.Preconditions;
     23 
     24 /**
     25  * An interface that defines how a component can be animated with an {@link SnackBar}.
     26  */
     27 public interface SnackBarInteraction {
     28     /**
     29      * Returns the animator that will be run in reaction to the given SnackBar being shown.
     30      *
     31      * Implementations may return null here if it determines that the given SnackBar does not need
     32      * to animate this component.
     33      */
     34     ViewPropertyAnimator animateOnSnackBarShow(SnackBar snackBar);
     35 
     36     /**
     37      * Returns the animator that will be run in reaction to the given SnackBar being dismissed.
     38      *
     39      * Implementations may return null here if it determines that the given SnackBar does not need
     40      * to animate this component.
     41      */
     42     ViewPropertyAnimator animateOnSnackBarDismiss(SnackBar snackBar);
     43 
     44     /**
     45      * A basic implementation of {@link SnackBarInteraction} that assumes that the
     46      * {@link SnackBar} is always shown with {@link Gravity#BOTTOM} and that the provided View will
     47      * always need to be translated up to make room for the SnackBar.
     48      */
     49     public static class BasicSnackBarInteraction implements SnackBarInteraction {
     50         private final View mView;
     51 
     52         public BasicSnackBarInteraction(final View view) {
     53             mView = Preconditions.checkNotNull(view);
     54         }
     55 
     56         @Override
     57         public ViewPropertyAnimator animateOnSnackBarShow(final SnackBar snackBar) {
     58             final View rootView = snackBar.getRootView();
     59             return mView.animate().translationY(-rootView.getMeasuredHeight());
     60         }
     61 
     62         @Override
     63         public ViewPropertyAnimator animateOnSnackBarDismiss(final SnackBar snackBar) {
     64             return mView.animate().translationY(0);
     65         }
     66     }
     67 }