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feat: display edit history diff (#922)

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* build: add google's diff-match-patch

Copied from 62f2e689f4/java/src/name/fraser/neil/plaintext/diff_match_patch.java

* feat(status/edit-history): display diff for text

Closes https://github.com/sk22/megalodon/issues/789

* fix(status/edit-history): add fake poll id

* code style adjustments

* don't diff if only formatting changed

---------

Co-authored-by: sk <sk22@mailbox.org>
This commit is contained in:
FineFindus
2023-11-10 20:40:34 +01:00
committed by GitHub
parent 2818672cda
commit 06698d3c52
7 changed files with 2740 additions and 3 deletions
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26
mastodon/src/main/java/org/joinmastodon/android/ui/text/DiffRemovedSpan.java Normal file
View File

@@ -0,0 +1,26 @@
package org.joinmastodon.android.ui.text;
import android.text.TextPaint;
import android.text.style.CharacterStyle;
import org.joinmastodon.android.ui.utils.UiUtils;
public class DiffRemovedSpan extends CharacterStyle {
private final String text;
public DiffRemovedSpan(String text){
this.text=text;
}
@Override
public void updateDrawState(TextPaint tp) {
tp.setStrikeThruText(true);
tp.setColor(0xFFCA5B63);
}
public String getText() {
return text;
}
}

4
mastodon/src/main/java/org/joinmastodon/android/ui/text/HtmlParser.java
View File

@@ -1,6 +1,7 @@
package org.joinmastodon.android.ui.text;
import android.content.Context;
import android.graphics.Color;
import android.graphics.Typeface;
import android.text.SpannableStringBuilder;
import android.text.Spanned;
@@ -171,6 +172,9 @@ public class HtmlParser{
}
case "code", "pre" -> openSpans.add(new SpanInfo(new TypefaceSpan("monospace"), ssb.length(), el));
case "blockquote" -> openSpans.add(new SpanInfo(new LeadingMarginSpan.Standard(V.dp(10)), ssb.length(), el));
// fake elements for the edit history diff view
case "edit-diff-insert" -> openSpans.add(new SpanInfo(new ForegroundColorSpan(UiUtils.isDarkTheme() ? 0xFF89bb9c : 0xFF5b8e63), ssb.length(), el));
case "edit-diff-delete" -> openSpans.add(new SpanInfo(new DiffRemovedSpan(el.text()), ssb.length(), el));
}
}
}