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Code Issues Releases Wiki Activity

Custom rendering: bullets

This commit is contained in:
M66B 2020-04-24 23:13:32 +02:00
parent 075b1edbf9
commit e4edac1956
1 changed files with 89 additions and 12 deletions
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101
app/src/main/java/eu/faircode/email/HtmlHelper.java
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@ -24,17 +24,21 @@ import android.content.SharedPreferences;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Typeface;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.os.Build;
import android.text.Html;
import android.text.Layout;
import android.text.Spannable;
import android.text.SpannableStringBuilder;
import android.text.Spanned;
import android.text.TextUtils;
import android.text.style.BulletSpan;
import android.text.style.ForegroundColorSpan;
import android.text.style.ImageSpan;
import android.text.style.LeadingMarginSpan;
import android.text.style.QuoteSpan;
import android.text.style.RelativeSizeSpan;
import android.text.style.StrikethroughSpan;
@ -307,6 +311,8 @@ public class HtmlHelper {
boolean display_hidden = prefs.getBoolean("display_hidden", false);
boolean disable_tracking = prefs.getBoolean("disable_tracking", true);
boolean parse_classes = prefs.getBoolean("parse_classes", false);
boolean experiments = prefs.getBoolean("experiments", false);
// https://chromium.googlesource.com/chromium/blink/+/master/Source/core/css/html.css
@ -748,17 +754,19 @@ public class HtmlHelper {
// Lists
// https://developer.mozilla.org/en-US/docs/Web/HTML/Element/li
for (Element li : document.select("li")) {
li.tagName("span");
Element parent = li.parent();
if (parent == null || "ul".equals(parent.tagName()))
li.prependText("• ");
else
li.prependText((li.elementSiblingIndex() + 1) + ". ");
li.appendElement("br"); // line break after list item
if (!experiments) {
for (Element li : document.select("li")) {
li.tagName("span");
Element parent = li.parent();
if (parent == null || "ul".equals(parent.tagName()))
li.prependText("• ");
else
li.prependText((li.elementSiblingIndex() + 1) + ". ");
li.appendElement("br"); // line break after list item
}
document.select("ol").tagName("div");
document.select("ul").tagName("div");
}
document.select("ol").tagName("div");
document.select("ul").tagName("div");
// Tables
// https://developer.mozilla.org/en-US/docs/Web/HTML/Element/table
@ -1763,6 +1771,9 @@ public class HtmlHelper {
static Spanned fromDocument(Context context, @NonNull Document document, @Nullable Html.ImageGetter imageGetter, @Nullable Html.TagHandler tagHandler) {
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
boolean experiments = prefs.getBoolean("experiments", false);
int colorAccent = Helper.resolveColor(context, R.attr.colorAccent);
int dp3 = Helper.dp2pixels(context, 3);
int dp6 = Helper.dp2pixels(context, 6);
if (experiments) {
// https://developer.android.com/guide/topics/text/spans
@ -1849,8 +1860,8 @@ public class HtmlHelper {
int level = element.tagName().charAt(1) - '1';
ssb.setSpan(new RelativeSizeSpan(HEADING_SIZES[level]), start, ssb.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
ssb.setSpan(new StyleSpan(Typeface.BOLD), start, ssb.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
ssb.append("\n");
ssb.insert(start, "\n");
ssb.append("\n");
break;
case "img":
String src = element.attr("src");
@ -1860,6 +1871,32 @@ public class HtmlHelper {
ssb.insert(start, "\uFFFC"); // Object replacement character
ssb.setSpan(new ImageSpan(d, src), start, start + 1, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
break;
case "li":
ssb.append("\n");
Element parent = element.parent();
if (parent == null || "ul".equals(parent.tagName()))
// TODO BulletSpanCompat
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.P)
ssb.setSpan(new BulletSpan(dp6, colorAccent), start, ssb.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
else
ssb.setSpan(new BulletSpan(dp6, colorAccent, dp3), start, ssb.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
else {
int index = 0;
for (Node child : parent.childNodes()) {
if (child instanceof Element) {
index++;
if (child == element)
break;
}
}
ssb.setSpan(new NumberSpan(dp6, colorAccent, index), start, ssb.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
}
break;
case "ol":
case "ul":
ssb.insert(start, "\n");
ssb.append("\n");
break;
case "pre":
// Do nothing
break;
@ -1960,7 +1997,7 @@ public class HtmlHelper {
return doc.html();
}
static Spanned reverseSpans(Spanned spanned) {
private static Spanned reverseSpans(Spanned spanned) {
Object[] spans = spanned.getSpans(0, spanned.length(), Object.class);
Spannable reverse = Spannable.Factory.getInstance().newSpannable(spanned.toString());
if (spans != null && spans.length > 0)
@ -1972,4 +2009,44 @@ public class HtmlHelper {
spanned.getSpanFlags(spans[i]));
return reverse;
}
private static class NumberSpan implements LeadingMarginSpan {
private final int gapWidth;
private int color;
private final int index;
private float textWidth;
public NumberSpan(int gapWidth, int color, int index) {
this.gapWidth = gapWidth;
this.color = color;
this.index = index;
}
@Override
public int getLeadingMargin(boolean first) {
return Math.round(textWidth + gapWidth);
}
@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) {
if (first) {
Paint.Style ostyle = p.getStyle();
int ocolor = p.getColor();
Typeface oface = p.getTypeface();
p.setStyle(Paint.Style.FILL);
p.setColor(color);
p.setTypeface(Typeface.MONOSPACE);
String number = index + ".";
textWidth = p.measureText(number);
c.drawText(number, x, bottom - p.descent(), p);
p.setStyle(ostyle);
p.setColor(ocolor);
p.setTypeface(oface);
}
}
}
}