commit f1fbc3fbe78997f141e2770221fe5ab1b1e68014
author Sunny Goyal <sunnygoyal@google.com> Tue Oct 10 15:21:15 2017 -0700
committer Sunny Goyal <sunnygoyal@google.com> Fri Oct 13 18:47:54 2017 -0700
tree 466510cf18141f0a7a841c349096f6dfc23d5e8f
parent 10a1bd0e652ec7ea3e3ee861fc0d72261a33a3fd

Converting widget panel into a floating view

> The widget panel is only inflated when needed
> Using the swipe up/down interaction for widgets tray
> Removing additional view wrappers from all-apps
> Widget tray is preserved across activity recreation
> Launcher no longer has WIDGET state, the actual code around
  the states will be removed in a follow-up cl

Bug: 67678570
Bug: 67585158
Change-Id: Ia29a7c33ec81e6c53cc24e2906b7022b6f41755b

src/com/android/launcher3/BaseRecyclerView.java

diff --git a/src/com/android/launcher3/BaseRecyclerView.java b/src/com/android/launcher3/BaseRecyclerView.java
index 3ee6e51..afb83be 100644
--- a/src/com/android/launcher3/BaseRecyclerView.java
+++ b/src/com/android/launcher3/BaseRecyclerView.java
@@ -21,6 +21,7 @@
 import android.support.v7.widget.RecyclerView;
 import android.util.AttributeSet;
 import android.view.MotionEvent;
+import android.view.View;
 import android.view.ViewGroup;
 import android.widget.TextView;
 
@@ -99,11 +100,15 @@
         // DO NOT REMOVE, NEEDED IMPLEMENTATION FOR M BUILDS
     }
 
+    public int getScrollBarTop() {
+        return getPaddingTop();
+    }
+
     /**
      * Returns the height of the fast scroll bar
      */
     public int getScrollbarTrackHeight() {
-        return getHeight() - getPaddingTop() - getPaddingBottom();
+        return getHeight() - getScrollBarTop() - getPaddingBottom();
     }
 
     /**
@@ -121,13 +126,6 @@
         return availableScrollBarHeight;
     }
 
-    /**
-     * Returns the scrollbar for this recycler view.
-     */
-    public RecyclerViewFastScroller getScrollBar() {
-        return mScrollbar;
-    }
-
     @Override
     protected void dispatchDraw(Canvas canvas) {
         onUpdateScrollbar(0);
@@ -160,6 +158,28 @@
     }
 
     /**
+     * Returns whether the view itself will handle the touch event or not.
+     * @param ev MotionEvent in {@param eventSource}
+     */
+    public boolean shouldContainerScroll(MotionEvent ev, View eventSource) {
+        int[] point = new int[2];
+        point[0] = (int) ev.getX();
+        point[1] = (int) ev.getY();
+        Utilities.mapCoordInSelfToDescendant(mScrollbar, eventSource, point);
+        // IF the MotionEvent is inside the thumb, container should not be pulled down.
+        if (mScrollbar.shouldBlockIntercept(point[0], point[1])) {
+            return false;
+        }
+
+        // IF scroller is at the very top OR there is no scroll bar because there is probably not
+        // enough items to scroll, THEN it's okay for the container to be pulled down.
+        if (getCurrentScrollY() == 0) {
+            return true;
+        }
+        return false;
+    }
+
+    /**
      * @return whether fast scrolling is supported in the current state.
      */
     public boolean supportsFastScrolling() {