Fix bug #7367429 Popup window should get its direction from it Anchor View if it can

- set the popup layout direction depending on the anchor view's layout direction
(if not defined before)
- make first pass of ViewRootImpl.performTraversals() and configuration update
not override any layout direction that could have been set before

Change-Id: I8e86ca805f0caf52c058d06aa7861df56fb862e6

Author: Fabrice Di Meglio

core/java/android/view/ViewRootImpl.java

@@ -317,6 +317,8 @@ public final class ViewRootImpl implements ViewParent,
     private final int mDensity;
     private final int mNoncompatDensity;
 
+    private int mViewLayoutDirectionInitial;
+
     /**
      * Consistency verifier for debugging purposes.
      */
@@ -465,6 +467,7 @@ public void setView(View view, WindowManager.LayoutParams attrs, View panelParen
         synchronized (this) {
             if (mView == null) {
                 mView = view;
+                mViewLayoutDirectionInitial = mView.getRawLayoutDirection();
                 mFallbackEventHandler.setView(view);
                 mWindowAttributes.copyFrom(attrs);
                 attrs = mWindowAttributes;
@@ -1184,7 +1187,10 @@ private void performTraversals() {
             viewVisibilityChanged = false;
             mLastConfiguration.setTo(host.getResources().getConfiguration());
             mLastSystemUiVisibility = mAttachInfo.mSystemUiVisibility;
-            host.setLayoutDirection(mLastConfiguration.getLayoutDirection());
+            // Set the layout direction if it has not been set before (inherit is the default)
+            if (mViewLayoutDirectionInitial == View.LAYOUT_DIRECTION_INHERIT) {
+                host.setLayoutDirection(mLastConfiguration.getLayoutDirection());
+            }
             host.dispatchAttachedToWindow(attachInfo, 0);
             mFitSystemWindowsInsets.set(mAttachInfo.mContentInsets);
             host.fitSystemWindows(mFitSystemWindowsInsets);
@@ -2680,7 +2686,8 @@ void updateConfiguration(Configuration config, boolean force) {
                 final int lastLayoutDirection = mLastConfiguration.getLayoutDirection();
                 final int currentLayoutDirection = config.getLayoutDirection();
                 mLastConfiguration.setTo(config);
-                if (lastLayoutDirection != currentLayoutDirection) {
+                if (lastLayoutDirection != currentLayoutDirection &&
+                        mViewLayoutDirectionInitial == View.LAYOUT_DIRECTION_INHERIT) {
                     mView.setLayoutDirection(currentLayoutDirection);
                 }
                 mView.dispatchConfigurationChanged(config);

core/java/android/widget/PopupWindow.java

@@ -142,6 +142,8 @@ public void onScrollChanged() {
         };
     private int mAnchorXoff, mAnchorYoff;
 
+    private boolean mPopupViewInitialLayoutDirectionInherited;
+
     /**
      * <p>Create a new empty, non focusable popup window of dimension (0,0).</p>
      *
@@ -968,6 +970,8 @@ private void preparePopup(WindowManager.LayoutParams p) {
         } else {
             mPopupView = mContentView;
         }
+        mPopupViewInitialLayoutDirectionInherited =
+                (mPopupView.getRawLayoutDirection() == View.LAYOUT_DIRECTION_INHERIT);
         mPopupWidth = p.width;
         mPopupHeight = p.height;
     }
@@ -985,9 +989,19 @@ private void invokePopup(WindowManager.LayoutParams p) {
             p.packageName = mContext.getPackageName();
         }
         mPopupView.setFitsSystemWindows(mLayoutInsetDecor);
+        setLayoutDirectionFromAnchor();
         mWindowManager.addView(mPopupView, p);
     }
 
+    private void setLayoutDirectionFromAnchor() {
+        if (mAnchor != null) {
+            View anchor = mAnchor.get();
+            if (anchor != null && mPopupViewInitialLayoutDirectionInherited) {
+                mPopupView.setLayoutDirection(anchor.getLayoutDirection());
+            }
+        }
+    }
+
     /**
      * <p>Generate the layout parameters for the popup window.</p>
      *
@@ -1304,8 +1318,9 @@ public void update() {
             p.flags = newFlags;
             update = true;
         }
-        
+
         if (update) {
+            setLayoutDirectionFromAnchor();
             mWindowManager.updateViewLayout(mPopupView, p);
         }
     }
@@ -1406,6 +1421,7 @@ public void update(int x, int y, int width, int height, boolean force) {
         }
 
         if (update) {
+            setLayoutDirectionFromAnchor();
             mWindowManager.updateViewLayout(mPopupView, p);
         }
     }
@@ -1482,7 +1498,7 @@ private void update(View anchor, boolean updateLocation, int xoff, int yoff,
         } else {
             updateAboveAnchor(findDropDownPosition(anchor, p, mAnchorXoff, mAnchorYoff));            
         }
-        
+
         update(p.x, p.y, width, height, x != p.x || y != p.y);
     }