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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"); you may not use this file except
      5  * in compliance with the License. You may obtain a copy of the License at
      6  *
      7  * http://www.apache.org/licenses/LICENSE-2.0
      8  *
      9  * Unless required by applicable law or agreed to in writing, software distributed under the License
     10  * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
     11  * or implied. See the License for the specific language governing permissions and limitations under
     12  * the License.
     13  */
     14 package androidx.leanback.widget;
     15 
     16 import android.graphics.Outline;
     17 import android.view.View;
     18 import android.view.ViewOutlineProvider;
     19 
     20 import androidx.annotation.RequiresApi;
     21 
     22 @RequiresApi(21)
     23 class ShadowHelperApi21 {
     24 
     25     static class ShadowImpl {
     26         View mShadowContainer;
     27         float mNormalZ;
     28         float mFocusedZ;
     29     }
     30 
     31     static final ViewOutlineProvider sOutlineProvider = new ViewOutlineProvider() {
     32         @Override
     33         public void getOutline(View view, Outline outline) {
     34             outline.setRect(0, 0, view.getWidth(), view.getHeight());
     35             outline.setAlpha(1.0f);
     36         }
     37     };
     38 
     39     /* add shadows and return a implementation detail object */
     40     public static Object addDynamicShadow(
     41             View shadowContainer, float unfocusedZ, float focusedZ, int roundedCornerRadius) {
     42         if (roundedCornerRadius > 0) {
     43             RoundedRectHelperApi21.setClipToRoundedOutline(shadowContainer, true,
     44                     roundedCornerRadius);
     45         } else {
     46             shadowContainer.setOutlineProvider(sOutlineProvider);
     47         }
     48         ShadowImpl impl = new ShadowImpl();
     49         impl.mShadowContainer = shadowContainer;
     50         impl.mNormalZ = unfocusedZ;
     51         impl.mFocusedZ = focusedZ;
     52         shadowContainer.setZ(impl.mNormalZ);
     53         return impl;
     54     }
     55 
     56     /* set shadow focus level 0 for unfocused 1 for fully focused */
     57     public static void setShadowFocusLevel(Object object, float level) {
     58         ShadowImpl impl = (ShadowImpl) object;
     59         impl.mShadowContainer.setZ(impl.mNormalZ + level * (impl.mFocusedZ - impl.mNormalZ));
     60     }
     61 
     62     private ShadowHelperApi21() {
     63     }
     64 }
     65