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 java.util.Arrays; 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_SCRIM_VIEW = 1; 32 public static final int UI_STATE_WIDGET_BOTTOM_SHEET = 2; 33 public static final int UI_STATE_FULLSCREEN_TASK = 3; 34 public static final int UI_STATE_ALLAPPS = 4; 35 36 public static final int FLAG_LIGHT_NAV = 1 << 0; 37 public static final int FLAG_DARK_NAV = 1 << 1; 38 public static final int FLAG_LIGHT_STATUS = 1 << 2; 39 public static final int FLAG_DARK_STATUS = 1 << 3; 40 41 private final Window mWindow; 42 private final int[] mStates = new int[5]; 43 SystemUiController(Window window)44 public SystemUiController(Window window) { 45 mWindow = window; 46 } 47 updateUiState(int uiState, boolean isLight)48 public void updateUiState(int uiState, boolean isLight) { 49 updateUiState(uiState, isLight 50 ? (FLAG_LIGHT_NAV | FLAG_LIGHT_STATUS) : (FLAG_DARK_NAV | FLAG_DARK_STATUS)); 51 } 52 updateUiState(int uiState, int flags)53 public void updateUiState(int uiState, int flags) { 54 if (mStates[uiState] == flags) { 55 return; 56 } 57 mStates[uiState] = flags; 58 59 int oldFlags = mWindow.getDecorView().getSystemUiVisibility(); 60 // Apply the state flags in priority order 61 int newFlags = oldFlags; 62 for (int stateFlag : mStates) { 63 newFlags = getSysUiVisibilityFlags(stateFlag, newFlags); 64 } 65 if (newFlags != oldFlags) { 66 mWindow.getDecorView().setSystemUiVisibility(newFlags); 67 } 68 } 69 70 /** 71 * Returns the sysui visibility for the base layer 72 */ getBaseSysuiVisibility()73 public int getBaseSysuiVisibility() { 74 return getSysUiVisibilityFlags( 75 mStates[UI_STATE_BASE_WINDOW], mWindow.getDecorView().getSystemUiVisibility()); 76 } 77 getSysUiVisibilityFlags(int stateFlag, int currentVisibility)78 private int getSysUiVisibilityFlags(int stateFlag, int currentVisibility) { 79 if ((stateFlag & FLAG_LIGHT_NAV) != 0) { 80 currentVisibility |= View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR; 81 } else if ((stateFlag & FLAG_DARK_NAV) != 0) { 82 currentVisibility &= ~(View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR); 83 } 84 85 if ((stateFlag & FLAG_LIGHT_STATUS) != 0) { 86 currentVisibility |= View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR; 87 } else if ((stateFlag & FLAG_DARK_STATUS) != 0) { 88 currentVisibility &= ~(View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR); 89 } 90 return currentVisibility; 91 } 92 93 @Override toString()94 public String toString() { 95 return "mStates=" + Arrays.toString(mStates); 96 } 97 } 98