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      1 /*
      2  * Copyright (C) 2017 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.launcher3.util;
     18 
     19 import android.view.View;
     20 import android.view.Window;
     21 
     22 import com.android.launcher3.Utilities;
     23 
     24 /**
     25  * Utility class to manage various window flags to control system UI.
     26  */
     27 public class SystemUiController {
     28 
     29     // Various UI states in increasing order of priority
     30     public static final int UI_STATE_BASE_WINDOW = 0;
     31     public static final int UI_STATE_ALL_APPS = 1;
     32     public static final int UI_STATE_WIDGET_BOTTOM_SHEET = 2;
     33     public static final int UI_STATE_ROOT_VIEW = 3;
     34 
     35     public static final int FLAG_LIGHT_NAV = 1 << 0;
     36     public static final int FLAG_DARK_NAV = 1 << 1;
     37     public static final int FLAG_LIGHT_STATUS = 1 << 2;
     38     public static final int FLAG_DARK_STATUS = 1 << 3;
     39 
     40     private final Window mWindow;
     41     private final int[] mStates = new int[4];
     42 
     43     public SystemUiController(Window window) {
     44         mWindow = window;
     45     }
     46 
     47     public void updateUiState(int uiState, boolean isLight) {
     48         updateUiState(uiState, isLight
     49                 ? (FLAG_LIGHT_NAV | FLAG_LIGHT_STATUS) : (FLAG_DARK_NAV | FLAG_DARK_STATUS));
     50     }
     51 
     52     public void updateUiState(int uiState, int flags) {
     53         if (mStates[uiState] == flags) {
     54             return;
     55         }
     56         mStates[uiState] = flags;
     57 
     58         int oldFlags = mWindow.getDecorView().getSystemUiVisibility();
     59         // Apply the state flags in priority order
     60         int newFlags = oldFlags;
     61         for (int stateFlag : mStates) {
     62             if (Utilities.ATLEAST_OREO) {
     63                 if ((stateFlag & FLAG_LIGHT_NAV) != 0) {
     64                     newFlags |= View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR;
     65                 } else if ((stateFlag & FLAG_DARK_NAV) != 0) {
     66                     newFlags &= ~(View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR);
     67                 }
     68             }
     69 
     70             if ((stateFlag & FLAG_LIGHT_STATUS) != 0) {
     71                 newFlags |= View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR;
     72             } else if ((stateFlag & FLAG_DARK_STATUS) != 0) {
     73                 newFlags &= ~(View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR);
     74             }
     75         }
     76         if (newFlags != oldFlags) {
     77             mWindow.getDecorView().setSystemUiVisibility(newFlags);
     78         }
     79     }
     80 }
     81