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support headings and reduce empty line height

This commit is contained in:
sk 2022-11-30 16:15:31 +01:00
parent da8933ec58
commit 670e4c8538
1 changed files with 41 additions and 12 deletions
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39
mastodon/src/main/java/org/joinmastodon/android/ui/text/HtmlParser.java
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@ -6,7 +6,9 @@ import android.graphics.fonts.FontStyle;
import android.text.SpannableStringBuilder;
import android.text.Spanned;
import android.text.TextUtils;
import android.text.style.BackgroundColorSpan;
import android.text.style.BulletSpan;
import android.text.style.ForegroundColorSpan;
import android.text.style.LeadingMarginSpan;
import android.text.style.RelativeSizeSpan;
import android.text.style.StrikethroughSpan;
@ -15,10 +17,13 @@ import android.text.style.SubscriptSpan;
import android.text.style.SuperscriptSpan;
import android.text.style.TypefaceSpan;
import android.text.style.UnderlineSpan;
import android.util.TypedValue;
import android.widget.TextView;
import com.twitter.twittertext.Regex;
import org.joinmastodon.android.MastodonApp;
import org.joinmastodon.android.R;
import org.joinmastodon.android.model.Emoji;
import org.joinmastodon.android.model.Hashtag;
import org.joinmastodon.android.model.Mention;
@ -81,11 +86,17 @@ public class HtmlParser{
public Object span;
public int start;
public Element element;
public boolean more;
public SpanInfo(Object span, int start, Element element){
this(span, start, element, false);
}
public SpanInfo(Object span, int start, Element element, boolean more){
this.span=span;
this.start=start;
this.element=element;
this.more=more;
}
}
@ -135,8 +146,20 @@ public class HtmlParser{
}
case "li" -> openSpans.add(new SpanInfo(new BulletSpan(V.dp(8)), ssb.length(), el));
case "em", "i" -> openSpans.add(new SpanInfo(new StyleSpan(Typeface.ITALIC), ssb.length(), el));
case "h1" -> openSpans.add(new SpanInfo(new RelativeSizeSpan(1.3f), ssb.length(), el));
case "strong", "b", "h2" -> openSpans.add(new SpanInfo(new StyleSpan(Typeface.BOLD), ssb.length(), el));
case "h1", "h2", "h3", "h4", "h5", "h6" -> {
// increase line height above heading (multiplying the margin)
if (node.previousSibling()!=null) ssb.setSpan(new RelativeSizeSpan(2), ssb.length() - 1, ssb.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
if (!node.nodeName().equals("h1")) {
openSpans.add(new SpanInfo(new StyleSpan(Typeface.BOLD), ssb.length(), el));
}
openSpans.add(new SpanInfo(new RelativeSizeSpan(switch(node.nodeName()) {
case "h1" -> 1.5f;
case "h2" -> 1.25f;
case "h3" -> 1.125f;
default -> 1;
}), ssb.length(), el, !node.nodeName().equals("h1")));
}
case "strong", "b" -> openSpans.add(new SpanInfo(new StyleSpan(Typeface.BOLD), ssb.length(), el));
case "u" -> openSpans.add(new SpanInfo(new UnderlineSpan(), ssb.length(), el));
case "s", "del" -> openSpans.add(new SpanInfo(new StrikethroughSpan(), ssb.length(), el));
case "sub" -> openSpans.add(new SpanInfo(new SubscriptSpan(), ssb.length(), el));
@ -152,23 +175,29 @@ public class HtmlParser{
@Override
public void tail(@NonNull Node node, int depth){
if(node instanceof Element el){
processOpenSpan(el);
if("span".equals(el.nodeName()) && el.hasClass("ellipsis")){
ssb.append("…", new DeleteWhenCopiedSpan(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
}else if(blockElements.contains(el.nodeName()) && node.nextSibling()!=null){
ssb.append("\n\n");
ssb.append("\n"); // line end
ssb.append("\n", new RelativeSizeSpan(0.75f), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); // margin after block
}
}
}
private void processOpenSpan(Element el) {
if(!openSpans.isEmpty()){
SpanInfo si=openSpans.get(openSpans.size()-1);
if(si.element==el){
ssb.setSpan(si.span, si.start, ssb.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
openSpans.remove(openSpans.size()-1);
if(si.more) processOpenSpan(el);
}
if("li".equals(el.nodeName()) && node.nextSibling()!=null) {
if("li".equals(el.nodeName()) && el.nextSibling()!=null) {
ssb.append('\n');
}
}
}
}
});
if(!emojis.isEmpty())
parseCustomEmoji(ssb, emojis);