1 files changed, 64 insertions, 0 deletions
diff --git a/src/com/android/customization/picker/HorizontalTouchMovementAwareNestedScrollView.kt b/src/com/android/customization/picker/HorizontalTouchMovementAwareNestedScrollView.kt
new file mode 100644
index 00000000..06cf7539
--- /dev/null
+++ b/src/com/android/customization/picker/HorizontalTouchMovementAwareNestedScrollView.kt
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.customization.picker
+
+import android.content.Context
+import android.util.AttributeSet
+import android.view.MotionEvent
+import android.view.ViewConfiguration
+import androidx.core.widget.NestedScrollView
+import kotlin.math.abs
+
+/**
+ * This nested scroll view will detect horizontal touch movements and stop vertical scrolls when a
+ * horizontal touch movement is detected.
+ */
+class HorizontalTouchMovementAwareNestedScrollView(context: Context, attrs: AttributeSet?) :
+    NestedScrollView(context, attrs) {
+
+    private var startXPosition = 0f
+    private var startYPosition = 0f
+    private var isHorizontalTouchMovement = false
+
+    override fun onInterceptTouchEvent(event: MotionEvent): Boolean {
+        when (event.action) {
+            MotionEvent.ACTION_DOWN -> {
+                startXPosition = event.x
+                startYPosition = event.y
+                isHorizontalTouchMovement = false
+            }
+            MotionEvent.ACTION_MOVE -> {
+                val xMoveDistance = abs(event.x - startXPosition)
+                val yMoveDistance = abs(event.y - startYPosition)
+                if (
+                    !isHorizontalTouchMovement &&
+                        xMoveDistance > yMoveDistance &&
+                        xMoveDistance > ViewConfiguration.get(context).scaledTouchSlop
+                ) {
+                    isHorizontalTouchMovement = true
+                }
+            }
+            else -> {}
+        }
+        return if (isHorizontalTouchMovement) {
+            // We only want to intercept the touch event when the touch moves more vertically than
+            // horizontally. So we return false.
+            false
+        } else {
+            super.onInterceptTouchEvent(event)
+        }
+    }
+}