CommentViewModel.java

package com.hitherejoe.mvvm_hackernews.viewModel;

import android.content.Context;
import android.databinding.BaseObservable;
import android.databinding.Bindable;
import android.databinding.BindingAdapter;
import android.text.Html;
import android.view.View;
import android.view.ViewGroup;
import android.widget.RelativeLayout;

import com.hitherejoe.mvvm_hackernews.R;
import com.hitherejoe.mvvm_hackernews.model.Comment;
import com.hitherejoe.mvvm_hackernews.util.ViewUtils;

import org.ocpsoft.prettytime.PrettyTime;

import java.util.Date;

public class CommentViewModel extends BaseObservable {

    private Context context;
    private Comment comment;

    public CommentViewModel(Context context, Comment comment) {
        this.context = context;
        this.comment = comment;
    }

    @BindingAdapter("containerMargin")
    public static void setContainerMargin(View view, boolean isTopLevelComment) {
        if (view.getTag() == null) {
            view.setTag(true);
            ViewGroup.MarginLayoutParams layoutParams = (ViewGroup.MarginLayoutParams)
                    view.getLayoutParams();
            float horizontalMargin = view.getContext().getResources().getDimension(R.dimen.activity_horizontal_margin);
            float topMargin = isTopLevelComment
                    ? view.getContext().getResources().getDimension(R.dimen.activity_vertical_margin) : 0;
            layoutParams.setMargins((int) horizontalMargin, (int) topMargin, (int) horizontalMargin, 0);
            view.setLayoutParams(layoutParams);
        }
    }

    @BindingAdapter("commentDepth")
    public static void setCommentIndent(View view, int depth) {
        if (view.getTag() == null) {
            view.setTag(true);
            RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams)
                    view.getLayoutParams();
            float margin = ViewUtils.convertPixelsToDp(depth * 20, view.getContext());
            layoutParams.setMargins((int) margin, 0, 0, 0);
            view.setLayoutParams(layoutParams);
        }
    }

    public String getCommentText() {
        return Html.fromHtml(comment.text.trim()).toString();
    }

    public String getCommentAuthor() {
        return context.getResources().getString(R.string.text_comment_author, comment.by);
    }

    public String getCommentDate() {
        return new PrettyTime().format(new Date(comment.time * 1000));
    }

    public int getCommentDepth() {
        return comment.depth;
    }

    public boolean getCommentIsTopLevel() {
        return comment.isTopLevelComment;
    }
}