Expand/collapse all subtasks for list

app/src/main/java/com/todoroo/astrid/activity/TaskListFragment.java

@@ -313,7 +313,10 @@ public final class TaskListFragment extends InjectingFragment
       hidden.setChecked(preferences.getBoolean(R.string.p_show_hidden_tasks, false));
       completed.setChecked(preferences.getBoolean(R.string.p_show_completed_tasks, false));
     }
-
+    if (taskAdapter.supportsManualSorting()) {
+      menu.findItem(R.id.menu_collapse_subtasks).setVisible(false);
+      menu.findItem(R.id.menu_expand_subtasks).setVisible(false);
+    }
     menu.findItem(R.id.menu_voice_add).setVisible(device.voiceInputAvailable());
 
     search = menu.findItem(R.id.menu_search).setOnActionExpandListener(this);
@@ -401,6 +404,14 @@ public final class TaskListFragment extends InjectingFragment
         tagSettings.putExtra(TagSettingsActivity.EXTRA_TAG_DATA, ((TagFilter) filter).getTagData());
         startActivityForResult(tagSettings, REQUEST_TAG_SETTINGS);
         return true;
+      case R.id.menu_expand_subtasks:
+        taskDao.setCollapsed(taskListViewModel.getValue(), false);
+        localBroadcastManager.broadcastRefresh();
+        return true;
+      case R.id.menu_collapse_subtasks:
+        taskDao.setCollapsed(taskListViewModel.getValue(), true);
+        localBroadcastManager.broadcastRefresh();
+        return true;
       default:
         return onOptionsItemSelected(item);
     }

app/src/main/java/com/todoroo/astrid/dao/TaskDao.java

@@ -6,10 +6,13 @@
 
 package com.todoroo.astrid.dao;
 
+import static com.google.common.collect.Iterables.filter;
+import static com.google.common.collect.Iterables.transform;
 import static com.google.common.collect.Lists.transform;
 import static com.todoroo.andlib.sql.SqlConstants.COUNT;
 import static com.todoroo.andlib.utility.AndroidUtilities.atLeastLollipop;
 import static com.todoroo.andlib.utility.DateUtilities.now;
+import static org.tasks.db.DbUtils.batch;
 
 import androidx.room.Dao;
 import androidx.room.Insert;
@@ -165,6 +168,16 @@ public abstract class TaskDao {
   @Query("UPDATE tasks SET collapsed = :collapsed WHERE _id = :id")
   public abstract void setCollapsed(long id, boolean collapsed);
 
+  @Transaction
+  public void setCollapsed(List<TaskContainer> tasks, boolean collapsed) {
+    batch(
+        transform(filter(tasks, TaskContainer::hasChildren), TaskContainer::getId),
+        l -> collapse(l, collapsed));
+  }
+
+  @Query("UPDATE tasks SET collapsed = :collapsed WHERE _id IN (:ids)")
+  abstract void collapse(List<Long> ids, boolean collapsed);
+
   /**
    * Saves the given task to the database.getDatabase(). Task must already exist. Returns true on
    * success.

app/src/main/res/menu/menu_task_list_fragment.xml

@@ -30,6 +30,14 @@
       android:checkable="true"
       android:title="@string/show_completed"/>
   </group>
+  <item
+    android:id="@+id/menu_expand_subtasks"
+    android:title="@string/expand_subtasks"
+    app:showAsAction="never" />
+  <item
+    android:id="@+id/menu_collapse_subtasks"
+    android:title="@string/collapse_subtasks"
+    app:showAsAction="never" />
   <item
     android:id="@+id/menu_clear_completed"
     android:title="@string/gtasks_GTA_clear_completed"

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

@@ -554,4 +554,6 @@ File %1$s contained %2$s.\n\n
   <string name="monthly">Monthly</string>
   <string name="annually">Yearly</string>
   <string name="caldav_account_repeating_tasks">Let server schedule recurring tasks</string>
+  <string name="expand_subtasks">Expand subtasks</string>
+  <string name="collapse_subtasks">Collapse subtasks</string>
 </resources>