fedilab-Android-App/app/src/main/java/app/fedilab/android/drawers/ConversationDecoration.java

package app.fedilab.android.drawers;
/* Copyright 2018 Thomas Schneider
 *
 * This file is a part of Fedilab
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the
 * GNU General Public License as published by the Free Software Foundation; either version 3 of the
 * License, or (at your option) any later version.
 *
 * Fedilab is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
 * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
 * Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with Fedilab; if not,
 * see <http://www.gnu.org/licenses>. */


import android.content.Context;
import android.content.SharedPreferences;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import androidx.annotation.NonNull;
import androidx.core.content.ContextCompat;
import androidx.recyclerview.widget.RecyclerView;
import android.view.View;

import app.fedilab.android.client.Entities.Status;
import app.fedilab.android.helper.Helper;
import app.fedilab.android.R;

import static app.fedilab.android.drawers.StatusListAdapter.FOCUSED_STATUS;

/**
 * Created by Thomas on 08/09/2018.
 * Adapter for thread decoration
 */
public class ConversationDecoration extends RecyclerView.ItemDecoration{

    private Drawable divider;
    private Context context;
    private boolean compactMode, consoleMode;

    public ConversationDecoration(Context context, int theme){
        SharedPreferences sharedpreferences = context.getSharedPreferences(Helper.APP_PREFS, Context.MODE_PRIVATE);
        if( theme == Helper.THEME_BLACK)
            divider = ContextCompat.getDrawable(context,R.drawable.line_divider_black);
        else if(theme == Helper.THEME_DARK)
            divider = ContextCompat.getDrawable(context,R.drawable.line_divider_dark);
        else if(theme == Helper.THEME_LIGHT)
            divider = ContextCompat.getDrawable(context,R.drawable.line_divider_light);
        this.context = context;

        this.compactMode = sharedpreferences.getBoolean(Helper.SET_COMPACT_MODE, false);
        this.consoleMode = sharedpreferences.getBoolean(Helper.SET_CONSOLE_MODE, false);
    }

    @Override
    public void onDraw(@NonNull Canvas canvas, @NonNull RecyclerView parent, @NonNull RecyclerView.State state) {

        int leftSide;

        if( consoleMode)
            leftSide = (int) Helper.convertDpToPixel(6, context);
        else if( compactMode)
            leftSide = (int) Helper.convertDpToPixel(3, context);
        else
            leftSide = (int) Helper.convertDpToPixel(28, context);

        int left = parent.getPaddingLeft() + leftSide;
        int right = left + (int)Helper.convertDpToPixel(4, context);
        int childCount = parent.getChildCount();

        int offSet = (int) Helper.convertDpToPixel(30, context);

        for (int i = 0; i < childCount; i++) {

            View child = parent.getChildAt(i);
            StatusListAdapter adapter = (StatusListAdapter) parent.getAdapter();
            int position = parent.getChildAdapterPosition(child);

            assert adapter != null;
            Status status = adapter.getItem(position);

            int top, bottom;
            if( status != null){

                int itemViewType = status.getItemViewType();
                Status statusBefore = null;
                if( itemViewType != FOCUSED_STATUS || position == 0){
                    if( position > 0)
                        statusBefore = adapter.getItem(position - 1);
                    top = (statusBefore != null && statusBefore.getId().equals(status.getIn_reply_to_id()))?
                            child.getTop(): (child.getTop() + offSet);
                    Status statusAfter = null;
                    if( adapter.getItemCount() > position+1)
                        statusAfter = adapter.getItem(position + 1);
                    bottom =  (statusAfter != null && status.getId().equals(statusAfter.getIn_reply_to_id()) )?
                            child.getBottom():child.getTop()+offSet;
                    if( position == 0 && childCount > 1)
                        top = bottom - (int)Helper.convertDpToPixel(14, context);
                    if( position == 0 && childCount  <= 1 )
                        top = bottom;
                }else{
                    top = child.getTop();
                    bottom = top + (int)Helper.convertDpToPixel(14, context);
                }

                divider.setBounds(left, top, right, bottom);
                divider.draw(canvas);
            }

        }

    }

}