Swipe to remove filter criteria

app/src/main/java/com/todoroo/astrid/core/CustomFilterItemTouchHelper.kt

@@ -1,12 +1,22 @@
 package com.todoroo.astrid.core
 
+import android.content.Context
+import android.graphics.Canvas
+import android.graphics.drawable.ColorDrawable
+import androidx.core.content.ContextCompat
 import androidx.recyclerview.widget.ItemTouchHelper
 import androidx.recyclerview.widget.RecyclerView
+import org.tasks.Callback
 import org.tasks.Callback2
+import org.tasks.R
 
-class CustomFilterItemTouchHelper(private val onMove: Callback2<Int, Int>, private val onClear: Runnable) : ItemTouchHelper.Callback() {
+class CustomFilterItemTouchHelper(
+        private val context: Context,
+        private val onMove: Callback2<Int, Int>,
+        private val onDelete: Callback<Int>,
+        private val onClear: Runnable) : ItemTouchHelper.Callback() {
     override fun getMovementFlags(recyclerView: RecyclerView, viewHolder: RecyclerView.ViewHolder): Int {
-        return if (viewHolder.adapterPosition > 0) makeMovementFlags(ItemTouchHelper.UP or ItemTouchHelper.DOWN, 0) else 0
+        return if (viewHolder.adapterPosition > 0) makeMovementFlags(ItemTouchHelper.UP or ItemTouchHelper.DOWN, ItemTouchHelper.LEFT or ItemTouchHelper.RIGHT) else 0
     }
 
     override fun onSelectedChanged(viewHolder: RecyclerView.ViewHolder?, actionState: Int) {
@@ -27,6 +37,27 @@ class CustomFilterItemTouchHelper(private val onMove: Callback2<Int, Int>, priva
         return true
     }
 
+    override fun getSwipeEscapeVelocity(defaultValue: Float): Float {
+        return defaultValue * 3
+    }
+
+    override fun getSwipeVelocityThreshold(defaultValue: Float): Float {
+        return .6f
+    }
+
+    override fun onChildDraw(c: Canvas, recyclerView: RecyclerView, viewHolder: RecyclerView.ViewHolder, dX: Float, dY: Float, actionState: Int, isCurrentlyActive: Boolean) {
+        val itemView = viewHolder.itemView
+        val background = ColorDrawable(ContextCompat.getColor(context, R.color.overdue))
+        if (dX > 0) {
+            background.setBounds(0, itemView.top, itemView.left + dX.toInt(), itemView.bottom)
+        } else if (dX < 0) {
+            background.setBounds(itemView.right + dX.toInt(), itemView.top, itemView.right, itemView.bottom)
+        }
+        background.draw(c)
+
+        super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
+    }
+
     override fun clearView(recyclerView: RecyclerView, viewHolder: RecyclerView.ViewHolder) {
         super.clearView(recyclerView, viewHolder)
 
@@ -35,5 +66,7 @@ class CustomFilterItemTouchHelper(private val onMove: Callback2<Int, Int>, priva
         onClear.run()
     }
 
-    override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {}
+    override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {
+        onDelete.call(viewHolder.adapterPosition)
+    }
 }

app/src/main/java/org/tasks/activities/FilterSettingsActivity.java

@@ -118,10 +118,9 @@ public class FilterSettingsActivity extends BaseListSettingsActivity {
       criteria.add(instance);
     }
     adapter = new CustomFilterAdapter(criteria, locale, this::onClick);
-
     recyclerView.setLayoutManager(new LinearLayoutManager(this));
     recyclerView.setAdapter(adapter);
-    new ItemTouchHelper(new CustomFilterItemTouchHelper(this::onMove, this::updateList))
+    new ItemTouchHelper(new CustomFilterItemTouchHelper(this, this::onMove, this::onDelete, this::updateList))
         .attachToRecyclerView(recyclerView);
 
     fab.setExtended(isNew() || adapter.getItemCount() <= 1);
@@ -131,6 +130,11 @@ public class FilterSettingsActivity extends BaseListSettingsActivity {
     updateTheme();
   }
 
+  private void onDelete(int index) {
+    criteria.remove(index);
+    updateList();
+  }
+
   private void onMove(int from, int to) {
     CriterionInstance criterion = criteria.remove(from);
     criteria.add(to, criterion);
@@ -156,11 +160,6 @@ public class FilterSettingsActivity extends BaseListSettingsActivity {
               updateList();
             })
         .show();
-    view.findViewById(R.id.delete).setOnClickListener(v -> {
-      d.dismiss();
-      criteria.remove(criterionInstance);
-      updateList();
-    });
     view.findViewById(R.id.reconfigure).setOnClickListener(v -> {
       d.dismiss();
       addCriteria(criterionInstance);

app/src/main/res/layout/custom_filter_row.xml

@@ -1,9 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
-  android:background="@color/window_background"
-  android:orientation="vertical">
+  android:background="@color/window_background">
 
     <RelativeLayout
       android:id="@+id/row"
@@ -50,4 +49,4 @@
 
     </RelativeLayout>
 
-</LinearLayout>
+</FrameLayout>

app/src/main/res/layout/dialog_custom_filter_row_edit.xml

@@ -45,9 +45,4 @@
       style="@style/TagSettingsRow"
       android:text="@string/choose_new_criteria" />
 
-    <TextView
-      android:id="@+id/delete"
-      style="@style/TagSettingsRow"
-      android:text="@string/delete" />
-
 </LinearLayout>