mirror of https://github.com/M66B/FairEmail.git
Added custom HTML to spanned converter (draft)
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M66B
parent
d98ee009aa
commit
bd0b1e5c11
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@ -24,6 +24,7 @@ import android.content.SharedPreferences;
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import android.graphics.Bitmap;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.Typeface;
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import android.graphics.drawable.Drawable;
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import android.net.Uri;
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import android.os.Build;
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@ -33,6 +34,13 @@ import android.text.SpannableStringBuilder;
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import android.text.Spanned;
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import android.text.TextUtils;
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import android.text.style.ForegroundColorSpan;
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import android.text.style.ImageSpan;
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import android.text.style.QuoteSpan;
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import android.text.style.RelativeSizeSpan;
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import android.text.style.StrikethroughSpan;
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import android.text.style.StyleSpan;
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import android.text.style.URLSpan;
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import android.text.style.UnderlineSpan;
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import android.util.Base64;
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import android.view.textclassifier.TextClassificationManager;
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import android.view.textclassifier.TextLanguage;
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@ -109,7 +117,7 @@ public class HtmlHelper {
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private static final int MAX_FORMAT_TEXT_SIZE = 50 * 1024; // characters
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private static final int MAX_FULL_TEXT_SIZE = 1024 * 1024; // characters
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private static final int TRACKING_PIXEL_SURFACE = 25; // pixels
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private static final float[] HEADING_SIZES = {1.5f, 1.4f, 1.3f, 1.2f, 1.1f, 1f};
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private static final HashMap<String, Integer> x11ColorMap = new HashMap<>();
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static {
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@ -1753,7 +1761,109 @@ public class HtmlHelper {
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}
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static Spanned fromDocument(@NonNull Document document, @Nullable Html.ImageGetter imageGetter, @Nullable Html.TagHandler tagHandler) {
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return fromHtml(document.html(), imageGetter, null);
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if (BuildConfig.DEBUG) {
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// https://developer.android.com/guide/topics/text/spans
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SpannableStringBuilder ssb = new SpannableStringBuilder();
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NodeTraversor.traverse(new NodeVisitor() {
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@Override
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public void head(Node node, int depth) {
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if (node instanceof Element) {
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Element element = (Element) node;
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element.attr("start-index", Integer.toString(ssb.length()));
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} else if (node instanceof TextNode) {
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TextNode tnode = (TextNode) node;
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ssb.append(tnode.text());
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}
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}
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@Override
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public void tail(Node node, int depth) {
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if (node instanceof Element) {
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Element element = (Element) node;
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int start = Integer.parseInt(element.attr("start-index"));
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switch (element.tagName()) {
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case "a":
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String href = element.attr("href");
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ssb.setSpan(new URLSpan(href), start, ssb.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
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break;
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case "body":
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// Do nothing
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break;
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case "big":
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ssb.setSpan(new RelativeSizeSpan(FONT_LARGE), start, ssb.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
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break;
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case "blockquote":
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ssb.setSpan(new QuoteSpan(), start, ssb.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
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break;
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case "br":
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ssb.append("\n");
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break;
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case "em":
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ssb.setSpan(new StyleSpan(Typeface.ITALIC), start, ssb.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
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break;
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case "h1":
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case "h2":
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case "h3":
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case "h4":
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case "h5":
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case "h6":
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int level = element.tagName().charAt(1) - '1';
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ssb.setSpan(new RelativeSizeSpan(HEADING_SIZES[level]), start, ssb.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
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ssb.setSpan(new StyleSpan(Typeface.BOLD), start, ssb.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
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break;
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case "img":
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if (imageGetter == null) {
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Log.e("img without getter");
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break;
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}
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String src = element.attr("src");
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Drawable d = imageGetter.getDrawable(src);
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ssb.append("\uFFFC"); // Object replacement character
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ssb.setSpan(new ImageSpan(d, src), ssb.length() - 1, ssb.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
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break;
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case "small":
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ssb.setSpan(new RelativeSizeSpan(FONT_SMALL), start, ssb.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
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break;
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case "span":
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// Do nothing
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break;
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case "strong":
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ssb.setSpan(new StyleSpan(Typeface.BOLD), start, ssb.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
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break;
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case "u":
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ssb.setSpan(new UnderlineSpan(), start, ssb.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
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break;
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default:
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Log.e("Unknown tag=" + element.tagName());
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}
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String style = element.attr("style");
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if (!TextUtils.isEmpty(style)) {
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String[] params = style.split(";");
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for (String param : params) {
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int semi = param.indexOf(":");
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String key = param.substring(0, semi);
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String value = param.substring(semi + 1);
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switch (key) {
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case "color":
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int color = Integer.parseInt(value.substring(1), 16) | 0xFF000000;
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ssb.setSpan(new ForegroundColorSpan(color), start, ssb.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
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break;
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case "text-decoration":
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if ("line-through".equals(value))
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ssb.setSpan(new StrikethroughSpan(), start, ssb.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
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break;
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}
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}
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}
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}
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}
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}, document.body());
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return ssb;
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} else
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return fromHtml(document.html(), imageGetter, null);
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}
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static Spanned fromHtml(@NonNull String html) {
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