Add BothAxesSwipeDetector
This reports both x and y displacement, and both velocities onDragEnd().
Bug: 126596417
Change-Id: I1c62074b99fe21bc9eedf615e3c9a0a0a400bf81
diff --git a/src/com/android/launcher3/touch/BaseSwipeDetector.java b/src/com/android/launcher3/touch/BaseSwipeDetector.java
index 08d73d0..12ca5ee 100644
--- a/src/com/android/launcher3/touch/BaseSwipeDetector.java
+++ b/src/com/android/launcher3/touch/BaseSwipeDetector.java
@@ -33,6 +33,7 @@
* swipe action happens.
*
* @see SingleAxisSwipeDetector
+ * @see BothAxesSwipeDetector
*/
public abstract class BaseSwipeDetector {
diff --git a/src/com/android/launcher3/touch/BothAxesSwipeDetector.java b/src/com/android/launcher3/touch/BothAxesSwipeDetector.java
new file mode 100644
index 0000000..944391e
--- /dev/null
+++ b/src/com/android/launcher3/touch/BothAxesSwipeDetector.java
@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 2019 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.launcher3.touch;
+
+import android.content.Context;
+import android.graphics.PointF;
+import android.view.MotionEvent;
+import android.view.ViewConfiguration;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.VisibleForTesting;
+
+import com.android.launcher3.Utilities;
+
+/**
+ * Two dimensional scroll/drag/swipe gesture detector that reports x and y displacement/velocity.
+ */
+public class BothAxesSwipeDetector extends BaseSwipeDetector {
+
+ public static final int DIRECTION_UP = 1 << 0;
+ // Note that this will track left instead of right in RTL.
+ public static final int DIRECTION_RIGHT = 1 << 1;
+ public static final int DIRECTION_DOWN = 1 << 2;
+ // Note that this will track right instead of left in RTL.
+ public static final int DIRECTION_LEFT = 1 << 3;
+
+ /* Client of this gesture detector can register a callback. */
+ private final Listener mListener;
+
+ private int mScrollDirections;
+
+ public BothAxesSwipeDetector(@NonNull Context context, @NonNull Listener l) {
+ this(ViewConfiguration.get(context), l, Utilities.isRtl(context.getResources()));
+ }
+
+ @VisibleForTesting
+ protected BothAxesSwipeDetector(@NonNull ViewConfiguration config, @NonNull Listener l,
+ boolean isRtl) {
+ super(config, isRtl);
+ mListener = l;
+ }
+
+ public void setDetectableScrollConditions(int scrollDirectionFlags, boolean ignoreSlop) {
+ mScrollDirections = scrollDirectionFlags;
+ mIgnoreSlopWhenSettling = ignoreSlop;
+ }
+
+ @Override
+ protected boolean shouldScrollStart(PointF displacement) {
+ // Check if the client is interested in scroll in current direction.
+ boolean canScrollUp = (mScrollDirections & DIRECTION_UP) > 0
+ && displacement.y <= -mTouchSlop;
+ boolean canScrollRight = (mScrollDirections & DIRECTION_RIGHT) > 0
+ && displacement.x >= mTouchSlop;
+ boolean canScrollDown = (mScrollDirections & DIRECTION_DOWN) > 0
+ && displacement.y >= mTouchSlop;
+ boolean canScrollLeft = (mScrollDirections & DIRECTION_LEFT) > 0
+ && displacement.x <= -mTouchSlop;
+ return canScrollUp || canScrollRight || canScrollDown || canScrollLeft;
+ }
+
+ @Override
+ protected void reportDragStartInternal(boolean recatch) {
+ mListener.onDragStart(!recatch);
+ }
+
+ @Override
+ protected void reportDraggingInternal(PointF displacement, MotionEvent event) {
+ mListener.onDrag(displacement, event);
+ }
+
+ @Override
+ protected void reportDragEndInternal(PointF velocity) {
+ mListener.onDragEnd(velocity);
+ }
+
+ /** Listener to receive updates on the swipe. */
+ public interface Listener {
+ /** @param start whether this was the original drag start, as opposed to a recatch. */
+ void onDragStart(boolean start);
+
+ boolean onDrag(PointF displacement, MotionEvent motionEvent);
+
+ void onDragEnd(PointF velocity);
+ }
+}
diff --git a/src/com/android/launcher3/touch/SingleAxisSwipeDetector.java b/src/com/android/launcher3/touch/SingleAxisSwipeDetector.java
index 0bf2ff6..f2ebc45 100644
--- a/src/com/android/launcher3/touch/SingleAxisSwipeDetector.java
+++ b/src/com/android/launcher3/touch/SingleAxisSwipeDetector.java
@@ -161,6 +161,7 @@
/** Listener to receive updates on the swipe. */
public interface Listener {
+ /** @param start whether this was the original drag start, as opposed to a recatch. */
void onDragStart(boolean start);
// TODO remove
