lawnchair/quickstep/src/com/android/launcher3/taskbar/TaskbarAutohideSuspendController.java

/*
 * Copyright (C) 2021 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.android.launcher3.taskbar;

import androidx.annotation.IntDef;

import com.android.quickstep.SystemUiProxy;

import java.io.PrintWriter;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.util.StringJoiner;

/**
 * Normally Taskbar will auto-hide when entering immersive (fullscreen) apps. This controller allows
 * us to suspend that behavior in certain cases (e.g. opening a Folder or dragging an icon).
 */
public class TaskbarAutohideSuspendController implements
        TaskbarControllers.LoggableTaskbarController {

    public static final int FLAG_AUTOHIDE_SUSPEND_FULLSCREEN = 1 << 0;
    public static final int FLAG_AUTOHIDE_SUSPEND_DRAGGING = 1 << 1;

    @IntDef(flag = true, value = {
            FLAG_AUTOHIDE_SUSPEND_FULLSCREEN,
            FLAG_AUTOHIDE_SUSPEND_DRAGGING,
    })
    @Retention(RetentionPolicy.SOURCE)
    public @interface AutohideSuspendFlag {}

    private final SystemUiProxy mSystemUiProxy;

    private @AutohideSuspendFlag int mAutohideSuspendFlags = 0;

    public TaskbarAutohideSuspendController(TaskbarActivityContext activity) {
        mSystemUiProxy = SystemUiProxy.INSTANCE.get(activity);
    }

    public void onDestroy() {
        mSystemUiProxy.notifyTaskbarAutohideSuspend(false);
    }

    /**
     * Adds or removes the given flag, then notifies system UI proxy whether to suspend auto-hide.
     */
    public void updateFlag(@AutohideSuspendFlag int flag, boolean enabled) {
        if (enabled) {
            mAutohideSuspendFlags |= flag;
        } else {
            mAutohideSuspendFlags &= ~flag;
        }
        mSystemUiProxy.notifyTaskbarAutohideSuspend(mAutohideSuspendFlags != 0);
    }

    @Override
    public void dumpLogs(String prefix, PrintWriter pw) {
        pw.println(prefix + "TaskbarAutohideSuspendController:");

        pw.println(String.format(
                "%s\tmAutohideSuspendFlags=%s", prefix, getStateString(mAutohideSuspendFlags)));
    }

    private static String getStateString(int flags) {
        StringJoiner str = new StringJoiner("|");
        str.add((flags & FLAG_AUTOHIDE_SUSPEND_FULLSCREEN) != 0
                ? "FLAG_AUTOHIDE_SUSPEND_FULLSCREEN" : "");
        str.add((flags & FLAG_AUTOHIDE_SUSPEND_DRAGGING) != 0
                ? "FLAG_AUTOHIDE_SUSPEND_DRAGGING" : "");
        return str.toString();
    }
}