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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 androidx.leanback.widget;
     17 
     18 import android.os.Build;
     19 import android.view.LayoutInflater;
     20 import android.view.View;
     21 import android.view.ViewGroup;
     22 
     23 import androidx.leanback.R;
     24 
     25 /**
     26  * Helper for static (nine patch) shadows.
     27  */
     28 final class StaticShadowHelper {
     29     private StaticShadowHelper() {
     30     }
     31 
     32     static boolean supportsShadow() {
     33         return Build.VERSION.SDK_INT >= 21;
     34     }
     35 
     36     static void prepareParent(ViewGroup parent) {
     37         if (Build.VERSION.SDK_INT >= 21) {
     38             parent.setLayoutMode(ViewGroup.LAYOUT_MODE_OPTICAL_BOUNDS);
     39         }
     40     }
     41 
     42     static Object addStaticShadow(ViewGroup shadowContainer) {
     43         if (Build.VERSION.SDK_INT >= 21) {
     44             shadowContainer.setLayoutMode(ViewGroup.LAYOUT_MODE_OPTICAL_BOUNDS);
     45             LayoutInflater inflater = LayoutInflater.from(shadowContainer.getContext());
     46             inflater.inflate(R.layout.lb_shadow, shadowContainer, true);
     47             ShadowImpl impl = new ShadowImpl();
     48             impl.mNormalShadow = shadowContainer.findViewById(R.id.lb_shadow_normal);
     49             impl.mFocusShadow = shadowContainer.findViewById(R.id.lb_shadow_focused);
     50             return impl;
     51         }
     52         return null;
     53     }
     54 
     55     static void setShadowFocusLevel(Object impl, float level) {
     56         if (Build.VERSION.SDK_INT >= 21) {
     57             ShadowImpl shadowImpl = (ShadowImpl) impl;
     58             shadowImpl.mNormalShadow.setAlpha(1 - level);
     59             shadowImpl.mFocusShadow.setAlpha(level);
     60         }
     61     }
     62 
     63     static class ShadowImpl {
     64         View mNormalShadow;
     65         View mFocusShadow;
     66     }
     67 }
     68