1 /* 2 * Copyright (C) 2016 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.systemui.statusbar.policy; 18 19 import android.annotation.Nullable; 20 import android.graphics.drawable.Drawable; 21 import android.graphics.drawable.LayerDrawable; 22 import android.view.Gravity; 23 24 /** 25 * Drawable for {@link KeyButtonView}s which contains an asset for both normal mode and light 26 * navigation bar mode. 27 */ 28 public class KeyButtonDrawable extends LayerDrawable { 29 30 private final boolean mHasDarkDrawable; 31 32 public static KeyButtonDrawable create(Drawable lightDrawable, 33 @Nullable Drawable darkDrawable) { 34 if (darkDrawable != null) { 35 return new KeyButtonDrawable( 36 new Drawable[] { lightDrawable.mutate(), darkDrawable.mutate() }); 37 } else { 38 return new KeyButtonDrawable(new Drawable[] { lightDrawable.mutate() }); 39 } 40 } 41 42 private KeyButtonDrawable(Drawable[] drawables) { 43 super(drawables); 44 for (int i = 0; i < drawables.length; i++) { 45 setLayerGravity(i, Gravity.CENTER); 46 } 47 mutate(); 48 mHasDarkDrawable = drawables.length > 1; 49 setDarkIntensity(0f); 50 } 51 52 public void setDarkIntensity(float intensity) { 53 if (!mHasDarkDrawable) { 54 return; 55 } 56 getDrawable(0).setAlpha((int) ((1 - intensity) * 255f)); 57 getDrawable(1).setAlpha((int) (intensity * 255f)); 58 invalidateSelf(); 59 } 60 } 61
