MrSluffy
121 lines
3.7 KiB
Java
121 lines
3.7 KiB
Java
/*
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* Copyright (C) 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.wm.shell.onehanded;
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import android.annotation.IntDef;
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import java.io.PrintWriter;
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import java.lang.annotation.Retention;
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import java.lang.annotation.RetentionPolicy;
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import java.util.ArrayList;
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import java.util.List;
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/**
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Represents current OHM state by following steps, a generic CUJ is
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STATE_NONE -> STATE_ENTERING -> STATE_ACTIVE -> STATE_EXITING -> STATE_NONE
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*/
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public class OneHandedState {
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/** DEFAULT STATE after OHM feature initialized. */
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public static final int STATE_NONE = 0;
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/** The state flag set when user trigger OHM. */
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public static final int STATE_ENTERING = 1;
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/** The state flag set when transitioning */
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public static final int STATE_ACTIVE = 2;
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/** The state flag set when user stop OHM feature. */
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public static final int STATE_EXITING = 3;
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@IntDef(prefix = { "STATE_" }, value = {
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STATE_NONE,
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STATE_ENTERING,
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STATE_ACTIVE,
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STATE_EXITING
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})
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@Retention(RetentionPolicy.SOURCE)
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@interface State {}
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public OneHandedState() {
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sCurrentState = STATE_NONE;
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}
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@State
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private static int sCurrentState = STATE_NONE;
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private static final String TAG = OneHandedState.class.getSimpleName();
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private List<OnStateChangedListener> mStateChangeListeners = new ArrayList<>();
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/**
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* Adds listener to be called back when one handed state changed.
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* @param listener the listener to be called back
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*/
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public void addSListeners(OnStateChangedListener listener) {
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mStateChangeListeners.add(listener);
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}
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/**
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* Gets current transition state of One handed mode.
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* @return The bitwise flags representing current states.
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*/
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public @State int getState() {
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return sCurrentState;
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}
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/**
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* Is the One handed mode is in transitioning state.
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* @return true if One handed mode is in transitioning states.
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*/
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public boolean isTransitioning() {
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return sCurrentState == STATE_ENTERING || sCurrentState == STATE_EXITING;
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}
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/**
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* Is the One handed mode active state.
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* @return true if One handed mode is active state.
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*/
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public boolean isInOneHanded() {
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return sCurrentState == STATE_ACTIVE;
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}
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/**
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* Sets new state for One handed mode feature.
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* @param newState The bitwise value to represent current transition states.
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*/
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public void setState(@State int newState) {
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sCurrentState = newState;
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if (!mStateChangeListeners.isEmpty()) {
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mStateChangeListeners.forEach((listener) -> listener.onStateChanged(newState));
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}
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}
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/** Dumps internal state. */
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public void dump(PrintWriter pw) {
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final String innerPrefix = " ";
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pw.println(TAG);
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pw.println(innerPrefix + "sCurrentState=" + sCurrentState);
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}
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/**
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* Gets notified when one handed state changed
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*
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* @see OneHandedState
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*/
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public interface OnStateChangedListener {
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/** Called when one handed state changed */
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default void onStateChanged(@State int newState) {}
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}
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}
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