chinwag/chinwag-android
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3408 home help message (#3415)

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* 3408: First draft of help message on empty home timeline

* 3408: Move image spanning to utils; tweak gui a bit (looks like status)

* 3408: Use proper R again; appease linter

* 3408: Add doc; remove narrow comment

* 3408: null is default

* 3408: Add German text

* 3408: Stack refresh animation on top of help message (reorder)
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UlrichKu 2023-03-21 19:44:35 +01:00 • committed by GitHub
commit 182df2bfae
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9 changed files with 200 additions and 93 deletions
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app/src/main/java/com/keylesspalace/tusky/util/SpanUtils.kt
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@ -1,10 +1,19 @@
package com.keylesspalace.tusky.util
import android.content.Context
import android.graphics.drawable.Drawable
import android.os.Build
import android.text.Spannable
import android.text.SpannableStringBuilder
import android.text.Spanned
import android.text.style.CharacterStyle
import android.text.style.DynamicDrawableSpan
import android.text.style.ForegroundColorSpan
import android.text.style.ImageSpan
import android.text.style.URLSpan
import androidx.appcompat.content.res.AppCompatResources
import com.mikepenz.iconics.IconicsDrawable
import com.mikepenz.iconics.typeface.library.googlematerial.GoogleMaterial
import java.util.regex.Pattern
import kotlin.math.max
@ -61,6 +70,66 @@ private class PatternFinder(
val pattern: Pattern = Pattern.compile(regex, Pattern.CASE_INSENSITIVE)
}
/**
* Takes text containing mentions and hashtags and urls and makes them the given colour.
*/
fun highlightSpans(text: Spannable, colour: Int) {
// Strip all existing colour spans.
for (spanClass in spanClasses) {
clearSpans(text, spanClass)
}
// Colour the mentions and hashtags.
val string = text.toString()
val length = text.length
var start = 0
var end = 0
while (end in 0 until length && start >= 0) {
// Search for url first because it can contain the other characters
val found = findPattern(string, end)
start = found.start
end = found.end
if (start in 0 until end) {
text.setSpan(getSpan(found.matchType, string, colour, start, end), start, end, Spanned.SPAN_INCLUSIVE_EXCLUSIVE)
start += finders[found.matchType]!!.searchPrefixWidth
}
}
}
/**
* Replaces text of the form [drawabale name] or [iconics name] with their spanned counterparts (ImageSpan).
*/
fun addDrawables(text: CharSequence, color: Int, size: Int, context: Context): Spannable {
val alignment = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) DynamicDrawableSpan.ALIGN_CENTER else DynamicDrawableSpan.ALIGN_BASELINE
val builder = SpannableStringBuilder(text)
val pattern = Pattern.compile("\\[(drawable|iconics) ([0-9a-z_]+)\\]")
val matcher = pattern.matcher(builder)
while (matcher.find()) {
val resourceType = matcher.group(1)
val resourceName = matcher.group(2)
?: continue
val drawable: Drawable? = when (resourceType) {
"iconics" -> IconicsDrawable(context, GoogleMaterial.getIcon(resourceName))
else -> {
val drawableResourceId = context.resources.getIdentifier(resourceName, "drawable", context.packageName)
if (drawableResourceId != 0) AppCompatResources.getDrawable(context, drawableResourceId) else null
}
}
if (drawable != null) {
drawable.setBounds(0, 0, size, size)
drawable.setTint(color)
builder.setSpan(ImageSpan(drawable, alignment), matcher.start(), matcher.end(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
}
}
return builder
}
private fun <T> clearSpans(text: Spannable, spanClass: Class<T>) {
for (span in text.getSpans(0, text.length, spanClass)) {
text.removeSpan(span)
@ -136,30 +205,6 @@ private fun getSpan(matchType: FoundMatchType, string: String, colour: Int, star
}
}
/** Takes text containing mentions and hashtags and urls and makes them the given colour. */
fun highlightSpans(text: Spannable, colour: Int) {
// Strip all existing colour spans.
for (spanClass in spanClasses) {
clearSpans(text, spanClass)
}
// Colour the mentions and hashtags.
val string = text.toString()
val length = text.length
var start = 0
var end = 0
while (end in 0 until length && start >= 0) {
// Search for url first because it can contain the other characters
val found = findPattern(string, end)
start = found.start
end = found.end
if (start in 0 until end) {
text.setSpan(getSpan(found.matchType, string, colour, start, end), start, end, Spanned.SPAN_INCLUSIVE_EXCLUSIVE)
start += finders[found.matchType]!!.searchPrefixWidth
}
}
}
private fun isWordCharacters(codePoint: Int): Boolean {
return (codePoint in 0x30..0x39) || // [0-9]
(codePoint in 0x41..0x5a) || // [A-Z]