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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 
17 package com.android.tv.ui;
18 
19 import android.animation.Animator;
20 import android.animation.ValueAnimator;
21 import android.util.Log;
22 import android.view.View;
23 import android.view.ViewGroup.LayoutParams;
24 import java.lang.reflect.InvocationTargetException;
25 import java.lang.reflect.Method;
26 
27 /** A class that includes convenience methods for view classes. */
28 public class ViewUtils {
29     private static final String TAG = "ViewUtils";
30 
ViewUtils()31     private ViewUtils() {
32         // Prevent instantiation.
33     }
34 
setTransitionAlpha(View v, float alpha)35     public static void setTransitionAlpha(View v, float alpha) {
36         Method method;
37         try {
38             method = View.class.getDeclaredMethod("setTransitionAlpha", Float.TYPE);
39             method.invoke(v, alpha);
40         } catch (NoSuchMethodException
41                 | IllegalAccessException
42                 | IllegalArgumentException
43                 | InvocationTargetException e) {
44             Log.e(TAG, "Fail to call View.setTransitionAlpha", e);
45         }
46     }
47 
48     /**
49      * Creates an animator in view's height
50      *
51      * @param target the {@link view} animator performs on.
52      */
createHeightAnimator( final View target, int initialHeight, int targetHeight)53     public static Animator createHeightAnimator(
54             final View target, int initialHeight, int targetHeight) {
55         ValueAnimator animator = ValueAnimator.ofInt(initialHeight, targetHeight);
56         animator.addUpdateListener(
57                 new ValueAnimator.AnimatorUpdateListener() {
58                     @Override
59                     public void onAnimationUpdate(ValueAnimator animation) {
60                         int value = (Integer) animation.getAnimatedValue();
61                         if (value == 0) {
62                             if (target.getVisibility() != View.GONE) {
63                                 target.setVisibility(View.GONE);
64                             }
65                         } else {
66                             if (target.getVisibility() != View.VISIBLE) {
67                                 target.setVisibility(View.VISIBLE);
68                             }
69                             setLayoutHeight(target, value);
70                         }
71                     }
72                 });
73         return animator;
74     }
75 
76     /** Gets view's layout height. */
getLayoutHeight(View view)77     public static int getLayoutHeight(View view) {
78         LayoutParams layoutParams = view.getLayoutParams();
79         return layoutParams.height;
80     }
81 
82     /** Sets view's layout height. */
setLayoutHeight(View view, int height)83     public static void setLayoutHeight(View view, int height) {
84         LayoutParams layoutParams = view.getLayoutParams();
85         if (height != layoutParams.height) {
86             layoutParams.height = height;
87             view.setLayoutParams(layoutParams);
88         }
89     }
90 }
91