Home | History | Annotate | Download | only in util 
      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.text.TextUtils;
     20 import android.view.View;
     21 import android.view.Window;
     22 
     23 import com.android.launcher3.Utilities;
     24 
     25 import java.util.Arrays;
     26 
     27 /**
     28  * Utility class to manage various window flags to control system UI.
     29  */
     30 public class SystemUiController {
     31 
     32     // Various UI states in increasing order of priority
     33     public static final int UI_STATE_BASE_WINDOW = 0;
     34     public static final int UI_STATE_ALL_APPS = 1;
     35     public static final int UI_STATE_WIDGET_BOTTOM_SHEET = 2;
     36     public static final int UI_STATE_ROOT_VIEW = 3;
     37     public static final int UI_STATE_OVERVIEW = 4;
     38 
     39     public static final int FLAG_LIGHT_NAV = 1 << 0;
     40     public static final int FLAG_DARK_NAV = 1 << 1;
     41     public static final int FLAG_LIGHT_STATUS = 1 << 2;
     42     public static final int FLAG_DARK_STATUS = 1 << 3;
     43 
     44     private final Window mWindow;
     45     private final int[] mStates = new int[5];
     46 
     47     public SystemUiController(Window window) {
     48         mWindow = window;
     49     }
     50 
     51     public void updateUiState(int uiState, boolean isLight) {
     52         updateUiState(uiState, isLight
     53                 ? (FLAG_LIGHT_NAV | FLAG_LIGHT_STATUS) : (FLAG_DARK_NAV | FLAG_DARK_STATUS));
     54     }
     55 
     56     public void updateUiState(int uiState, int flags) {
     57         if (mStates[uiState] == flags) {
     58             return;
     59         }
     60         mStates[uiState] = flags;
     61 
     62         int oldFlags = mWindow.getDecorView().getSystemUiVisibility();
     63         // Apply the state flags in priority order
     64         int newFlags = oldFlags;
     65         for (int stateFlag : mStates) {
     66             if (Utilities.ATLEAST_OREO) {
     67                 if ((stateFlag & FLAG_LIGHT_NAV) != 0) {
     68                     newFlags |= View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR;
     69                 } else if ((stateFlag & FLAG_DARK_NAV) != 0) {
     70                     newFlags &= ~(View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR);
     71                 }
     72             }
     73 
     74             if ((stateFlag & FLAG_LIGHT_STATUS) != 0) {
     75                 newFlags |= View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR;
     76             } else if ((stateFlag & FLAG_DARK_STATUS) != 0) {
     77                 newFlags &= ~(View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR);
     78             }
     79         }
     80         if (newFlags != oldFlags) {
     81             mWindow.getDecorView().setSystemUiVisibility(newFlags);
     82         }
     83     }
     84 
     85     @Override
     86     public String toString() {
     87         return "mStates=" + Arrays.toString(mStates);
     88     }
     89 }
     90