[fenix] For https://github.com/mozilla-mobile/fenix/issues/1571: Make bookmark deletion undoable

CHANGELOG.md

@@ -32,6 +32,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - #1539 - Added bookmarks multi-select related features
 - #1603 - Remove deprecated success path for Firefox Accounts login
 - #619 - Sets toolbar behavior based on accessibility and if session is loading
+- #1571 - Added a snackbar for undoing bookmark deletion
 
 ### Changed
 - #1429 - Updated site permissions ui for MVP

app/src/main/java/org/mozilla/fenix/ext/CoroutineScope.kt

@@ -0,0 +1,26 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.fenix.ext
+
+import android.view.View
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
+import org.mozilla.fenix.components.FenixSnackbar
+
+fun CoroutineScope.allowUndo(view: View, message: String, undoActionTitle: String, operation: suspend () -> Unit) {
+    val undoJob = launch(Dispatchers.IO) {
+        delay(UNDO_DELAY)
+        operation.invoke()
+    }
+    FenixSnackbar.make(view, FenixSnackbar.LENGTH_LONG)
+        .setText(message)
+        .setAction(undoActionTitle) {
+            undoJob.cancel()
+        }.show()
+}
+
+internal const val UNDO_DELAY = 3000L

app/src/main/java/org/mozilla/fenix/ext/String.kt

@@ -6,6 +6,9 @@
 
 package org.mozilla.fenix.ext
 
+import java.net.MalformedURLException
+import java.net.URL
+
 /**
  * Replaces the keys with the values with the map provided.
  */
@@ -14,3 +17,12 @@ fun String.replace(pairs: Map<String, String>): String {
     pairs.forEach { (l, r) -> result = result.replace(l, r) }
     return result
 }
+
+fun String?.urlToHost(): String {
+    return try {
+        val url = URL(this)
+        url.host
+    } catch (e: MalformedURLException) {
+        ""
+    }
+}

app/src/main/java/org/mozilla/fenix/library/bookmarks/BookmarkFragment.kt

@@ -31,7 +31,6 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.Dispatchers.IO
 import kotlinx.coroutines.Dispatchers.Main
 import kotlinx.coroutines.Job
-import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
 import mozilla.appservices.places.BookmarkRoot
 import mozilla.components.concept.storage.BookmarkNode
@@ -45,9 +44,11 @@ import org.mozilla.fenix.BrowsingModeManager
 import org.mozilla.fenix.HomeActivity
 import org.mozilla.fenix.R
 import org.mozilla.fenix.components.FenixSnackbar
+import org.mozilla.fenix.ext.allowUndo
 import org.mozilla.fenix.ext.getColorFromAttr
 import org.mozilla.fenix.ext.requireComponents
 import org.mozilla.fenix.ext.share
+import org.mozilla.fenix.ext.urlToHost
 import org.mozilla.fenix.mvi.ActionBusFactory
 import org.mozilla.fenix.mvi.getAutoDisposeObservable
 import org.mozilla.fenix.mvi.getManagedEmitter
@@ -216,7 +217,10 @@ class BookmarkFragment : Fragment(), CoroutineScope, BackHandler, AccountObserve
                         }
                     }
                     is BookmarkAction.Delete -> {
-                        launch(IO) {
+                        allowUndo(
+                            view!!, getString(R.string.bookmark_deletion_snackbar_message, it.item.url.urlToHost()),
+                            getString(R.string.bookmark_undo_deletion)
+                        ) {
                             requireComponents.core.bookmarksStorage.deleteNode(it.item.guid)
                             refreshBookmarks()
                         }
@@ -277,16 +281,13 @@ class BookmarkFragment : Fragment(), CoroutineScope, BackHandler, AccountObserve
                 true
             }
             R.id.delete_bookmarks_multi_select -> {
-                val deleteJob = launch(IO) {
+                allowUndo(
-                    delay(bookmarkDeletionDelay)
+                    view!!, getString(R.string.bookmark_deletion_multiple_snackbar_message),
+                    getString(R.string.bookmark_undo_deletion)
+                ) {
                     deleteSelectedBookmarks()
                     refreshBookmarks()
                 }
-                FenixSnackbar.make(view!!, FenixSnackbar.LENGTH_LONG)
-                    .setText(getString(R.string.bookmark_deletion_multiple_snackbar_message))
-                    .setAction(getString(R.string.bookmark_undo_deletion)) {
-                        deleteJob.cancel()
-                    }.show()
                 true
             }
             else -> super.onOptionsItemSelected(item)
@@ -344,8 +345,4 @@ class BookmarkFragment : Fragment(), CoroutineScope, BackHandler, AccountObserve
         val uri = Uri.parse(url)
         clipBoard.primaryClip = ClipData.newRawUri("Uri", uri)
     }
-
-    companion object {
-        private const val bookmarkDeletionDelay = 3000L
-    }
 }

app/src/main/res/values/strings.xml

@@ -327,7 +327,8 @@
     <string name="bookmark_invalid_url_error">Invalid URL</string>
     <!-- Bookmark screen message for empty bookmarks folder -->
     <string name="bookmarks_empty_message">No bookmarks here</string>
-    <!-- Bookmark snackbar message on deletion -->
+    <!-- Bookmark snackbar message on deletion
+     The first parameter is the host part of the URL of the bookmark deleted, if any -->
     <string name="bookmark_deletion_snackbar_message">Deleted %1$s</string>
     <!-- Bookmark snackbar message on deleting multiple bookmarks -->
     <string name="bookmark_deletion_multiple_snackbar_message">Deleting selected bookmarks</string>