desktop: send images and files (#2691)

* desktop: send images and files

* expect/actual

* file filter on non-Linux OSes

---------

Co-authored-by: Evgeny Poberezkin <2769109+epoberezkin@users.noreply.github.com>

apps/multiplatform/common/src/androidMain/kotlin/chat/simplex/common/platform/Files.android.kt

@@ -32,6 +32,15 @@ actual fun rememberFileChooserLauncher(getContent: Boolean, onResult: (URI?) ->
   return FileChooserLauncher(launcher)
 }
 
+@Composable
+actual fun rememberFileChooserMultipleLauncher(onResult: (List<URI>) -> Unit): FileChooserMultipleLauncher {
+  val launcher = rememberLauncherForActivityResult(
+    contract = ActivityResultContracts.GetMultipleContents(),
+    onResult = { onResult(it.map { it.toURI() }) }
+  )
+  return FileChooserMultipleLauncher(launcher)
+}
+
 actual class FileChooserLauncher actual constructor() {
   private lateinit var launcher: ManagedActivityResultLauncher<String, Uri?>
 
@@ -44,5 +53,17 @@ actual class FileChooserLauncher actual constructor() {
   }
 }
 
+actual class FileChooserMultipleLauncher actual constructor() {
+  private lateinit var launcher: ManagedActivityResultLauncher<String, List<Uri>>
+
+  constructor(launcher: ManagedActivityResultLauncher<String, List<Uri>>): this() {
+    this.launcher = launcher
+  }
+
+  actual suspend fun launch(input: String) {
+    launcher.launch(input)
+  }
+}
+
 actual fun URI.inputStream(): InputStream? = androidAppContext.contentResolver.openInputStream(toUri())
 actual fun URI.outputStream(): OutputStream = androidAppContext.contentResolver.openOutputStream(toUri())!!

apps/multiplatform/common/src/androidMain/kotlin/chat/simplex/common/views/helpers/ChooseAttachmentView.android.kt

@@ -0,0 +1,30 @@
+package chat.simplex.common.views.helpers
+
+import androidx.compose.foundation.layout.*
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.MutableState
+import androidx.compose.ui.Modifier
+import chat.simplex.common.views.newchat.ActionButton
+import chat.simplex.res.MR
+import dev.icerock.moko.resources.compose.painterResource
+import dev.icerock.moko.resources.compose.stringResource
+
+@Composable
+actual fun ChooseAttachmentButtons(attachmentOption: MutableState<AttachmentOption?>, hide: () -> Unit) {
+  ActionButton(Modifier.fillMaxWidth(0.25f), null, stringResource(MR.strings.use_camera_button), icon = painterResource(MR.images.ic_camera_enhance)) {
+    attachmentOption.value = AttachmentOption.CameraPhoto
+    hide()
+  }
+  ActionButton(Modifier.fillMaxWidth(0.33f), null, stringResource(MR.strings.gallery_image_button), icon = painterResource(MR.images.ic_add_photo)) {
+    attachmentOption.value = AttachmentOption.GalleryImage
+    hide()
+  }
+  ActionButton(Modifier.fillMaxWidth(0.50f), null, stringResource(MR.strings.gallery_video_button), icon = painterResource(MR.images.ic_smart_display)) {
+    attachmentOption.value = AttachmentOption.GalleryVideo
+    hide()
+  }
+  ActionButton(Modifier.fillMaxWidth(1f), null, stringResource(MR.strings.choose_file), icon = painterResource(MR.images.ic_note_add)) {
+    attachmentOption.value = AttachmentOption.File
+    hide()
+  }
+}