WordPress/src/main/java/org/wordpress/android/ui/comments/CommentUtils.java

package org.wordpress.android.ui.comments;

import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.drawable.Drawable;
import android.support.v4.content.ContextCompat;
import android.text.Layout;
import android.text.SpannableString;
import android.text.Spanned;
import android.text.style.LeadingMarginSpan;
import android.text.util.Linkify;
import android.widget.TextView;

import org.wordpress.android.R;
import org.wordpress.android.WordPress;
import org.wordpress.android.util.EmoticonsUtils;
import org.wordpress.android.util.HtmlUtils;
import org.wordpress.android.util.helpers.WPImageGetter;

public class CommentUtils {
    /*
     * displays comment text as html, including retrieving images
     */
    public static void displayHtmlComment(TextView textView, String content, int maxImageSize) {
        if (textView == null) {
            return;
        }

        if (content == null) {
            textView.setText(null);
            return;
        }

        // skip performance hit of html conversion if content doesn't contain html
        if (!content.contains("<") && !content.contains("&")) {
            content = content.trim();
            textView.setText(content);
            // make sure unnamed links are clickable
            if (content.contains("://")) {
                Linkify.addLinks(textView, Linkify.WEB_URLS);
            }
            return;
        }

        // convert emoticons first (otherwise they'll be downloaded)
        content = EmoticonsUtils.replaceEmoticonsWithEmoji(content);

        // now convert to HTML with an image getter that enforces a max image size
        final Spanned html;
        if (maxImageSize > 0 && content.contains("<img")) {
            Drawable loading = ContextCompat.getDrawable(textView.getContext(),
                    R.drawable.legacy_dashicon_format_image_big_grey);
            Drawable failed = ContextCompat.getDrawable(textView.getContext(),
                    R.drawable.noticon_warning_big_grey);
            html = HtmlUtils.fromHtml(content, new WPImageGetter(textView, maxImageSize, WordPress.imageLoader, loading,
                    failed));
        } else {
            html = HtmlUtils.fromHtml(content);
        }

        // remove extra \n\n added by Html.convert()
        int start = 0;
        int end = html.length();
        while (start < end && Character.isWhitespace(html.charAt(start))) {
            start++;
        }
        while (end > start && Character.isWhitespace(html.charAt(end - 1))) {
            end--;
        }

        textView.setText(html.subSequence(start, end));
    }

    // Assumes all lines after first line will not be indented
    public static void indentTextViewFirstLine(TextView textView, int textOffsetX) {
        if (textView == null || textOffsetX < 0) return;

        SpannableString text = new SpannableString(textView.getText());
        text.setSpan(new TextWrappingLeadingMarginSpan(textOffsetX), 0, text.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        textView.setText(text);
    }

    private static class TextWrappingLeadingMarginSpan implements LeadingMarginSpan.LeadingMarginSpan2 {
        private final int margin;
        private final int lines;

        public TextWrappingLeadingMarginSpan(int margin) {
            this.margin = margin;
            this.lines = 1;
        }

        @Override
        public int getLeadingMargin(boolean first) {
            return first ? margin : 0;
        }

        @Override
        public void drawLeadingMargin(Canvas c, Paint p, int x, int dir, int top, int baseline, int bottom, CharSequence text, int start, int end, boolean first, Layout layout) {

        }

        @Override
        public int getLeadingMarginLineCount() {
            return lines;
        }
    }
}