Fix widget resizing (Which stopped working at some point)

-> Also, deferring empty screen removal until after the drop animation
   in order to reduce buggy transitions
-> Also fixing workspace layout on tablet

Change-Id: I1ae9fdaf592262f959424f321efa6df4298f85cc

res/layout-sw720dp/launcher.xml

@@ -57,6 +57,7 @@
             android:paddingEnd="@dimen/workspace_right_padding"
             android:paddingTop="@dimen/workspace_top_padding"
             android:paddingBottom="@dimen/workspace_bottom_padding"
+            android:layout_gravity="center"
             launcher:defaultScreen="@integer/config_workspaceDefaultScreen"
             launcher:cellCountX="@integer/cell_count_x"
             launcher:cellCountY="@integer/cell_count_y"

src/com/android/launcher3/AppWidgetResizeFrame.java

@@ -58,6 +58,7 @@ public class AppWidgetResizeFrame extends FrameLayout {
 
     int[] mDirectionVector = new int[2];
     int[] mLastDirectionVector = new int[2];
+    int[] mTmpPt = new int[2];
 
     final int SNAP_DURATION = 150;
     final int BACKGROUND_PADDING = 24;
@@ -399,18 +400,17 @@ public class AppWidgetResizeFrame extends FrameLayout {
 
     public void snapToWidget(boolean animate) {
         final DragLayer.LayoutParams lp = (DragLayer.LayoutParams) getLayoutParams();
-        int xOffset = mCellLayout.getLeft() + mCellLayout.getPaddingLeft()
-                + mDragLayer.getPaddingLeft() - mWorkspace.getScrollX();
-        int yOffset = mCellLayout.getTop() + mCellLayout.getPaddingTop()
-                + mDragLayer.getPaddingTop() - mWorkspace.getScrollY();
-
         int newWidth = mWidgetView.getWidth() + 2 * mBackgroundPadding - mWidgetPaddingLeft -
                 mWidgetPaddingRight;
         int newHeight = mWidgetView.getHeight() + 2 * mBackgroundPadding - mWidgetPaddingTop -
                 mWidgetPaddingBottom;
 
-        int newX = mWidgetView.getLeft() - mBackgroundPadding + xOffset + mWidgetPaddingLeft;
-        int newY = mWidgetView.getTop() - mBackgroundPadding + yOffset + mWidgetPaddingTop;
+        mTmpPt[0] = mWidgetView.getLeft();
+        mTmpPt[1] = mWidgetView.getTop();
+        mDragLayer.getDescendantCoordRelativeToSelf(mCellLayout.getShortcutsAndWidgets(), mTmpPt);
+
+        int newX = mTmpPt[0] - mBackgroundPadding + mWidgetPaddingLeft;
+        int newY = mTmpPt[1] - mBackgroundPadding + mWidgetPaddingTop;
 
         // We need to make sure the frame's touchable regions lie fully within the bounds of the 
         // DragLayer. We allow the actual handles to be clipped, but we shift the touch regions

src/com/android/launcher3/Workspace.java

@@ -2384,6 +2384,7 @@ public class Workspace extends SmoothPagedView
                     if (finalResizeRunnable != null) {
                         finalResizeRunnable.run();
                     }
+                    stripEmptyScreens();
                 }
             };
             mAnimatingViewIntoPlace = true;
@@ -3364,6 +3365,10 @@ public class Workspace extends SmoothPagedView
                         mDragController.removeDropTarget((DropTarget) mDragInfo.cell);
                     }
                 }
+                // If we move the item to anything not on the Workspace, check if any empty
+                // screens need to be removed. If we dropped back on the workspace, this will
+                // be done post drop animation.
+                stripEmptyScreens();
             }
         } else if (mDragInfo != null) {
             CellLayout cellLayout;
@@ -3380,8 +3385,6 @@ public class Workspace extends SmoothPagedView
         mDragOutline = null;
         mDragInfo = null;
 
-        stripEmptyScreens();
-
         // Hide the scrolling indicator after you pick up an item
         hideScrollingIndicator(false);
     }