From e3e7e63902bb2b280d1af47d975afedbeec6d094 Mon Sep 17 00:00:00 2001
From: Sreyas <sreyasr@google.com>
Date: Wed, 29 Jan 2020 10:42:10 -0800
Subject: [PATCH] OverviewActions: Fix action buttons in place

Forcing OverviewActions buttons to appear as if it is shown only once in overview screen by overlapping all instances in the same spot.

Change-Id: I195d5455d5eb9f12a19c352169bc995849e59281
---
 .../com/android/quickstep/views/TaskView.java | 30 +++++++++++++++++--
 src/com/android/launcher3/PagedView.java      |  7 +++++
 2 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/quickstep/recents_ui_overrides/src/com/android/quickstep/views/TaskView.java b/quickstep/recents_ui_overrides/src/com/android/quickstep/views/TaskView.java
index 58e36bc8d0..5954b86446 100644
--- a/quickstep/recents_ui_overrides/src/com/android/quickstep/views/TaskView.java
+++ b/quickstep/recents_ui_overrides/src/com/android/quickstep/views/TaskView.java
@@ -243,6 +243,7 @@ public class TaskView extends FrameLayout implements PageCallbacks, Reusable {
                         getResources().getDimensionPixelSize(R.dimen.overview_actions_height),
                         Gravity.BOTTOM);
                 addView(mActionsView, params);
+                mActionsView.setAlpha(0);
             }
         }
     }
@@ -447,7 +448,8 @@ public class TaskView extends FrameLayout implements PageCallbacks, Reusable {
         mIconView.setScaleX(scale);
         mIconView.setScaleY(scale);
 
-        if (mActionsView != null) {
+
+        if (mActionsView != null && isRunningTask()) {
             mActionsView.setAlpha(scale);
         }
 
@@ -523,9 +525,11 @@ public class TaskView extends FrameLayout implements PageCallbacks, Reusable {
     public void onPageScroll(ScrollState scrollState) {
         float curveInterpolation =
                 CURVE_INTERPOLATOR.getInterpolation(scrollState.linearInterpolation);
+        float curveScaleForCurveInterpolation = getCurveScaleForCurveInterpolation(
+                curveInterpolation);
 
         mSnapshotView.setDimAlpha(curveInterpolation * MAX_PAGE_SCRIM_ALPHA);
-        setCurveScale(getCurveScaleForCurveInterpolation(curveInterpolation));
+        setCurveScale(curveScaleForCurveInterpolation);
 
         mFooterAlpha = Utilities.boundToRange(1.0f - 2 * scrollState.linearInterpolation, 0f, 1f);
         for (FooterWrapper footer : mFooters) {
@@ -539,6 +543,28 @@ public class TaskView extends FrameLayout implements PageCallbacks, Reusable {
             mMenuView.setScaleX(getScaleX());
             mMenuView.setScaleY(getScaleY());
         }
+
+        // This is not the proper implementation and will be replaced with a proper layout.
+        if (mActionsView != null) {
+            if (mFocusTransitionProgress == 1f) {
+                mActionsView.setAlpha(1 - curveInterpolation / MAX_PAGE_SCRIM_ALPHA);
+            }
+            maintainActionViewPosition(curveScaleForCurveInterpolation);
+        }
+
+    }
+
+    private void maintainActionViewPosition(float curveScaleForCurveInterpolation) {
+        float inverseCurveScaleFactor = curveScaleForCurveInterpolation == 0 ? 0 :
+                (1f / curveScaleForCurveInterpolation);
+        mActionsView.setScaleX(inverseCurveScaleFactor);
+        mActionsView.setScaleY(inverseCurveScaleFactor);
+        mActionsView.setTranslationX(inverseCurveScaleFactor * (-getX()
+                + getRecentsView().getScrollX() + getRecentsView().scrollOffsetLeft()));
+        mActionsView.setTranslationY(
+                (1f - curveScaleForCurveInterpolation) * (mSnapshotView.getHeight()
+                        + mActionsView.getHeight()) / 2f
+                        + inverseCurveScaleFactor * (-getTranslationY()));
     }
 
 
diff --git a/src/com/android/launcher3/PagedView.java b/src/com/android/launcher3/PagedView.java
index a1888bfd08..ae4eae9179 100644
--- a/src/com/android/launcher3/PagedView.java
+++ b/src/com/android/launcher3/PagedView.java
@@ -245,6 +245,13 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
         forceFinishScroller(true);
     }
 
+    /**
+     * Returns left offset of a page. This is the gap between pages and prevents overlap.
+     */
+    public int scrollOffsetLeft() {
+        return mInsets.left + getPaddingLeft();
+    }
+
     private void abortScrollerAnimation(boolean resetNextPage) {
         mScroller.abortAnimation();
         // We need to clean up the next page here to avoid computeScrollHelper from