--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/src/main/java/com/geekorum/aboutoss/ui/OpenSourceLicenseScreen.kt Thu Apr 13 17:11:33 2023 -0400
@@ -0,0 +1,177 @@
+/*
+ * AboutOss is a utility library to retrieve and display
+ * opensource licenses in Android applications.
+ *
+ * Copyright (C) 2023 by Frederic-Charles Barthelery.
+ *
+ * This file is part of AboutOss.
+ *
+ * AboutOss is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * AboutOss is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with AboutOss. If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.geekorum.aboutoss.ui
+
+import androidx.compose.animation.core.animateDpAsState
+import androidx.compose.foundation.gestures.detectTapGestures
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material.Icon
+import androidx.compose.material.IconButton
+import androidx.compose.material.MaterialTheme
+import androidx.compose.material.Scaffold
+import androidx.compose.material.Text
+import androidx.compose.material.TopAppBar
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.ArrowBack
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.derivedStateOf
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.input.pointer.pointerInput
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.text.AnnotatedString
+import androidx.compose.ui.text.ExperimentalTextApi
+import androidx.compose.ui.text.SpanStyle
+import androidx.compose.ui.text.TextLayoutResult
+import androidx.compose.ui.text.UrlAnnotation
+import androidx.compose.ui.text.buildAnnotatedString
+import androidx.compose.ui.text.style.TextDecoration
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.text.withAnnotation
+import androidx.compose.ui.text.withStyle
+import androidx.compose.ui.unit.dp
+import androidx.core.net.toUri
+
+@Composable
+fun OpenSourceLicenseScreen(
+ viewModel: OpenSourceLicensesViewModel,
+ dependency: String,
+ onBackClick: () -> Unit,
+) {
+ val context = LocalContext.current
+ val license by viewModel.getLicenseDependency(dependency).collectAsState("")
+ OpenSourceLicenseScreen(
+ dependency = dependency,
+ license = license,
+ onBackClick = onBackClick,
+ onUrlClick = {
+ viewModel.openLinkInBrowser(context, it)
+ },
+ onUrlsFound = {
+ val uris = it.map { uri -> uri.toUri() }
+ viewModel.mayLaunchUrl(*uris.toTypedArray())
+ }
+ )
+}
+
+@OptIn(ExperimentalLayoutApi::class, ExperimentalTextApi::class)
+@Composable
+fun OpenSourceLicenseScreen(
+ dependency: String,
+ license: String,
+ onBackClick: () -> Unit,
+ onUrlClick: (String) -> Unit,
+ onUrlsFound: (List<String>) -> Unit,
+) {
+ val linkifiedLicense = linkifyText(text = license)
+ LaunchedEffect(linkifiedLicense) {
+ val uris =
+ linkifiedLicense.getUrlAnnotations(0, linkifiedLicense.length).map { it.item.url }
+ onUrlsFound(uris)
+ }
+
+ val scrollState = rememberScrollState()
+ val hasScrolled by remember {
+ derivedStateOf { scrollState.value > 0 }
+ }
+ val topBarElevation by animateDpAsState(
+ if (hasScrolled) 4.dp else 0.dp
+ )
+ Scaffold(topBar = {
+ TopAppBar(title = { Text(dependency, overflow = TextOverflow.Ellipsis, maxLines = 1) },
+ navigationIcon = {
+ IconButton(onClick = onBackClick) {
+ Icon(
+ Icons.Default.ArrowBack,
+ contentDescription = null
+ )
+ }
+ },
+ elevation = topBarElevation
+ )
+ }) { paddingValues ->
+ val layoutResult = remember { mutableStateOf<TextLayoutResult?>(null) }
+ val pressIndicator = Modifier.pointerInput(layoutResult, linkifiedLicense) {
+ detectTapGestures { pos ->
+ layoutResult.value?.let { layoutResult ->
+ val posWithScroll = pos.copy(y = pos.y + scrollState.value)
+ val offset = layoutResult.getOffsetForPosition(posWithScroll)
+ linkifiedLicense.getUrlAnnotations(start = offset, end = offset)
+ .firstOrNull()?.let { annotation ->
+ onUrlClick(annotation.item.url)
+ }
+ }
+ }
+ }
+
+ Text(linkifiedLicense,
+ modifier = Modifier
+ .padding(horizontal = 16.dp)
+ .fillMaxSize()
+ .then(pressIndicator)
+ .verticalScroll(scrollState)
+ .padding(paddingValues)
+ .consumeWindowInsets(paddingValues),
+ onTextLayout = {
+ layoutResult.value = it
+ }
+ )
+ }
+}
+
+/**
+ * https://regexr.com/37i6s
+ */
+private val UrlRegexp = """https?://(www\.)?[-a-zA-Z0-9@:%._+~#=]{2,256}\.[a-z]{2,4}\b([-a-zA-Z0-9@:%_+.~#?&/=]*)""".toRegex()
+
+@OptIn(ExperimentalTextApi::class)
+@Composable
+private fun linkifyText(text: String): AnnotatedString {
+ val style = SpanStyle(
+ color = MaterialTheme.colors.secondary,
+ textDecoration = TextDecoration.Underline
+ )
+ return remember(text, style) {
+ buildAnnotatedString {
+ var currentIdx = 0
+ for (match in UrlRegexp.findAll(text)) {
+ if (currentIdx < match.range.first) {
+ append(text.substring(currentIdx, match.range.first))
+ }
+ val url = text.substring(match.range)
+ withAnnotation(UrlAnnotation(url)) {
+ withStyle(style) {
+ append(url)
+ }
+ }
+ currentIdx = match.range.last + 1
+ }
+ append(text.substring(currentIdx))
+ }
+ }
+}