2 files changed, 177 insertions, 0 deletions
diff --git a/wallet/src/main/java/net/taler/wallet/compose/QrCodeUriComposable.kt b/wallet/src/main/java/net/taler/wallet/compose/QrCodeUriComposable.kt
new file mode 100644
index 0000000..3f8ecd1
--- /dev/null
+++ b/wallet/src/main/java/net/taler/wallet/compose/QrCodeUriComposable.kt
@@ -0,0 +1,124 @@
+/*
+ * This file is part of GNU Taler
+ * (C) 2022 Taler Systems S.A.
+ *
+ * GNU Taler 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, or (at your option) any later version.
+ *
+ * GNU Taler 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
+ * GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+package net.taler.wallet.compose
+
+import android.content.ClipData
+import android.content.ClipboardManager
+import android.content.Context
+import androidx.compose.foundation.Image
+import androidx.compose.foundation.horizontalScroll
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.ColumnScope
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.material.Button
+import androidx.compose.material.Icon
+import androidx.compose.material.MaterialTheme
+import androidx.compose.material.Text
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.ContentCopy
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.produceState
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.ImageBitmap
+import androidx.compose.ui.graphics.asImageBitmap
+import androidx.compose.ui.platform.LocalConfiguration
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.font.FontFamily
+import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.min
+import androidx.core.content.getSystemService
+import net.taler.common.QrCodeManager
+import net.taler.wallet.R
+
+@Composable
+fun ColumnScope.QrCodeUriComposable(
+    talerUri: String,
+    clipBoardLabel: String,
+    buttonText: String = stringResource(R.string.copy),
+    inBetween: (@Composable ColumnScope.() -> Unit)? = null,
+) {
+    val qrCodeSize = getQrCodeSize()
+    val qrState = produceState<ImageBitmap?>(null) {
+        value = QrCodeManager.makeQrCode(talerUri, qrCodeSize.value.toInt()).asImageBitmap()
+    }
+    qrState.value?.let { qrCode ->
+        Image(
+            modifier = Modifier.size(qrCodeSize),
+            bitmap = qrCode,
+            contentDescription = stringResource(id = R.string.button_scan_qr_code),
+        )
+    }
+    if (inBetween != null) inBetween()
+    val scrollState = rememberScrollState()
+    Box(modifier = Modifier.padding(16.dp)) {
+        Text(
+            modifier = Modifier.horizontalScroll(scrollState),
+            fontFamily = FontFamily.Monospace,
+            style = MaterialTheme.typography.body1,
+            text = talerUri,
+        )
+    }
+    CopyToClipboardButton(
+        modifier = Modifier,
+        label = clipBoardLabel,
+        content = talerUri,
+        buttonText = buttonText,
+    )
+}
+
+@Composable
+fun getQrCodeSize(): Dp {
+    val configuration = LocalConfiguration.current
+    val screenHeight = configuration.screenHeightDp.dp
+    val screenWidth = configuration.screenWidthDp.dp
+    return min(screenHeight, screenWidth)
+}
+
+@Composable
+fun CopyToClipboardButton(
+    label: String,
+    content: String,
+    modifier: Modifier = Modifier,
+    buttonText: String = stringResource(R.string.copy),
+) {
+    val context = LocalContext.current
+    Button(
+        modifier = modifier,
+        onClick = { copyToClipBoard(context, label, content) },
+    ) {
+        Row(verticalAlignment = Alignment.CenterVertically) {
+            Icon(Icons.Default.ContentCopy, stringResource(R.string.copy))
+            Text(
+                modifier = Modifier.padding(start = 8.dp),
+                text = buttonText,
+                style = MaterialTheme.typography.body1,
+            )
+        }
+    }
+}
+
+fun copyToClipBoard(context: Context, label: String, str: String) {
+    val clipboard = context.getSystemService<ClipboardManager>()
+    val clip = ClipData.newPlainText(label, str)
+    clipboard?.setPrimaryClip(clip)
+}
diff --git a/wallet/src/main/java/net/taler/wallet/compose/Utils.kt b/wallet/src/main/java/net/taler/wallet/compose/Utils.kt
new file mode 100644
index 0000000..21b04ed
--- /dev/null
+++ b/wallet/src/main/java/net/taler/wallet/compose/Utils.kt
@@ -0,0 +1,53 @@
+/*
+ * This file is part of GNU Taler
+ * (C) 2022 Taler Systems S.A.
+ *
+ * GNU Taler 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, or (at your option) any later version.
+ *
+ * GNU Taler 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
+ * GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+package net.taler.wallet.compose
+
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.State
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.remember
+import androidx.compose.ui.platform.LocalLifecycleOwner
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.LifecycleOwner
+import androidx.lifecycle.flowWithLifecycle
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.StateFlow
+import kotlin.coroutines.CoroutineContext
+import kotlin.coroutines.EmptyCoroutineContext
+
+@Composable
+fun <T> rememberFlow(
+    flow: Flow<T>,
+    lifecycleOwner: LifecycleOwner = LocalLifecycleOwner.current,
+): Flow<T> = remember(key1 = flow, key2 = lifecycleOwner) {
+    flow.flowWithLifecycle(lifecycleOwner.lifecycle, Lifecycle.State.STARTED)
+}
+
+@Composable
+fun <T : R, R> Flow<T>.collectAsStateLifecycleAware(
+    initial: R,
+    context: CoroutineContext = EmptyCoroutineContext,
+): State<R> {
+    val lifecycleAwareFlow = rememberFlow(flow = this)
+    return lifecycleAwareFlow.collectAsState(initial = initial, context = context)
+}
+
+@Suppress("StateFlowValueCalledInComposition")
+@Composable
+fun <T> StateFlow<T>.collectAsStateLifecycleAware(
+    context: CoroutineContext = EmptyCoroutineContext,
+): State<T> = collectAsStateLifecycleAware(initial = value, context = context)