1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file 5 * except 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 10 * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 11 * KIND, either express or implied. See the License for the specific language governing 12 * permissions and limitations under the License. 13 */ 14 15 package com.android.systemui.util; 16 17 import android.view.View; 18 19 import com.android.systemui.SysUiServiceProvider; 20 import com.android.systemui.statusbar.CommandQueue; 21 22 import java.util.List; 23 import java.util.function.Consumer; 24 25 public class Utils { 26 27 /** 28 * Allows lambda iteration over a list. It is done in reverse order so it is safe 29 * to add or remove items during the iteration. 30 */ safeForeach(List<T> list, Consumer<T> c)31 public static <T> void safeForeach(List<T> list, Consumer<T> c) { 32 for (int i = list.size() - 1; i >= 0; i--) { 33 c.accept(list.get(i)); 34 } 35 } 36 37 /** 38 * Sets the visibility of an UI element according to the DISABLE_* flags in 39 * {@link android.app.StatusBarManager}. 40 */ 41 public static class DisableStateTracker implements CommandQueue.Callbacks, 42 View.OnAttachStateChangeListener { 43 private final int mMask1; 44 private final int mMask2; 45 private View mView; 46 private boolean mDisabled; 47 DisableStateTracker(int disableMask, int disable2Mask)48 public DisableStateTracker(int disableMask, int disable2Mask) { 49 mMask1 = disableMask; 50 mMask2 = disable2Mask; 51 } 52 53 @Override onViewAttachedToWindow(View v)54 public void onViewAttachedToWindow(View v) { 55 mView = v; 56 SysUiServiceProvider.getComponent(v.getContext(), CommandQueue.class) 57 .addCallbacks(this); 58 } 59 60 @Override onViewDetachedFromWindow(View v)61 public void onViewDetachedFromWindow(View v) { 62 SysUiServiceProvider.getComponent(mView.getContext(), CommandQueue.class) 63 .removeCallbacks(this); 64 mView = null; 65 } 66 67 /** 68 * Sets visibility of this {@link View} given the states passed from 69 * {@link com.android.systemui.statusbar.CommandQueue.Callbacks#disable(int, int)}. 70 */ 71 @Override disable(int state1, int state2, boolean animate)72 public void disable(int state1, int state2, boolean animate) { 73 final boolean disabled = ((state1 & mMask1) != 0) || ((state2 & mMask2) != 0); 74 if (disabled == mDisabled) return; 75 mDisabled = disabled; 76 mView.setVisibility(disabled ? View.GONE : View.VISIBLE); 77 } 78 79 /** @return {@code true} if and only if this {@link View} is currently disabled */ isDisabled()80 public boolean isDisabled() { 81 return mDisabled; 82 } 83 } 84 } 85