SystemUI: Add CM statusbar item holder

/**

 * Copyright (C) 2018 The LineageOS 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.systemui.statusbar;

import android.content.Context;

import android.graphics.Rect;

import android.util.AttributeSet;

import android.view.View;

import android.view.View.OnSystemUiVisibilityChangeListener;

import android.widget.RelativeLayout;

import com.android.systemui.R;

import org.cyanogenmod.internal.statusbar.CMStatusBarItem;

import java.util.ArrayList;

public class CMStatusBarItemHolder extends RelativeLayout

        implements CMStatusBarItem.Manager {

    private static final String TAG = "CMStatusBarItemHolder";

    private ArrayList<CMStatusBarItem.VisibilityReceiver> mVisibilityReceivers =

            new ArrayList<CMStatusBarItem.VisibilityReceiver>();

    private Rect mLastArea;

    private int mLastTint;

    private boolean mItemHolderIsVisible;

    private Context mContext;

    public CMStatusBarItemHolder(Context context) {

        this(context, null);

    }

    public CMStatusBarItemHolder(Context context, AttributeSet attrs) {

        this(context, attrs, 0);

    }

    public CMStatusBarItemHolder(Context context, AttributeSet attrs, int defStyle) {

        super(context, attrs, defStyle);

        mContext = context;

        mItemHolderIsVisible = false;

    }

    @Override

    protected void onAttachedToWindow() {

        super.onAttachedToWindow();

        setOnSystemUiVisibilityChangeListener(mSystemUiVisibilityChangeListener);

        updateStatusBarVisibility(getSystemUiVisibility());

    }

    @Override

    protected void onDetachedFromWindow() {

        super.onDetachedFromWindow();

        setOnSystemUiVisibilityChangeListener(null);

    }

    // Collect and propagate item holder visibility to

    // registered receivers.

    //

    // We watch both our own view visibility and systemui visibility.

    // Latest change in either direction wins (and has been observed

    // thus far to always be correct).

    @Override

    public void onVisibilityAggregated(boolean isVisible) {

        super.onVisibilityAggregated(isVisible);

        updateVisibilityReceivers(isVisible);

    }

    private View.OnSystemUiVisibilityChangeListener mSystemUiVisibilityChangeListener =

            new View.OnSystemUiVisibilityChangeListener() {

        @Override

        public void onSystemUiVisibilityChange(int visibility) {

            updateStatusBarVisibility(visibility);

        }

    };

    private void updateStatusBarVisibility(int visibility) {

        final boolean isVisible =

                (visibility & SYSTEM_UI_FLAG_FULLSCREEN) == 0

                || (visibility & SYSTEM_UI_FLAG_LOW_PROFILE) != 0;

        updateVisibilityReceivers(isVisible);

    }

    private void updateVisibilityReceivers(boolean isVisible) {

        if (isVisible == mItemHolderIsVisible) {

            return;

        }

        mItemHolderIsVisible = isVisible;

        for (CMStatusBarItem.VisibilityReceiver r : mVisibilityReceivers) {

            r.onVisibilityChanged(mItemHolderIsVisible);

        }

    }

    // CMStatusBarItem.Manager methods

    public void addVisibilityReceiver(CMStatusBarItem.VisibilityReceiver visibilityReceiver) {

        mVisibilityReceivers.add(visibilityReceiver);

        visibilityReceiver.onVisibilityChanged(mItemHolderIsVisible);

    }

}