From f3ebdd4819fb04f18a4ca032f9f0bff6af480b6a Mon Sep 17 00:00:00 2001
From: Brian Isganitis <brianji@google.com>
Date: Wed, 19 Jul 2023 14:15:31 -0400
Subject: [PATCH] Start drag from current translation shift during animation.

Test: Manual
Fix: 291950331
Flag: No
Change-Id: I67fe6a474fc1b10d8e34fb047f98af2c1e6e085c
---
 .../launcher3/views/AbstractSlideInView.java      | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/src/com/android/launcher3/views/AbstractSlideInView.java b/src/com/android/launcher3/views/AbstractSlideInView.java
index 91eb10970b..de10fc518b 100644
--- a/src/com/android/launcher3/views/AbstractSlideInView.java
+++ b/src/com/android/launcher3/views/AbstractSlideInView.java
@@ -94,6 +94,8 @@ public abstract class AbstractSlideInView<T extends Context & ActivityContext>
 
     // range [0, 1], 0=> completely open, 1=> completely closed
     protected float mTranslationShift = TRANSLATION_SHIFT_CLOSED;
+    /** {@link #mTranslationShift} at the invocation of {@link #onDragStart(boolean, float)}. */
+    protected float mDragStartTranslationShift;
 
     protected boolean mNoIntercept;
     protected @Nullable OnCloseListener mOnCloseBeginListener;
@@ -285,18 +287,23 @@ public abstract class AbstractSlideInView<T extends Context & ActivityContext>
     /* SingleAxisSwipeDetector.Listener */
 
     @Override
-    public void onDragStart(boolean start, float startDisplacement) { }
+    public void onDragStart(boolean start, float startDisplacement) {
+        mOpenCloseAnimator.cancel();
+        mDragStartTranslationShift = mTranslationShift;
+    }
 
     @Override
     public boolean onDrag(float displacement) {
-        float range = getShiftRange();
-        displacement = Utilities.boundToRange(displacement, 0, range);
-        setTranslationShift(displacement / range);
+        setTranslationShift(Utilities.boundToRange(
+                mDragStartTranslationShift + displacement / getShiftRange(),
+                TRANSLATION_SHIFT_OPENED,
+                TRANSLATION_SHIFT_CLOSED));
         return true;
     }
 
     @Override
     public void onDragEnd(float velocity) {
+        mDragStartTranslationShift = 0;
         float successfulShiftThreshold = mActivityContext.getDeviceProfile().isTablet
                 ? TABLET_BOTTOM_SHEET_SUCCESS_TRANSITION_PROGRESS : SUCCESS_TRANSITION_PROGRESS;
         if ((mSwipeDetector.isFling(velocity) && velocity > 0)