[Android] Allow text handles to observe position of "parent" view

content/public/android/java/src/org/chromium/content/browser/input/InsertionHandleController.java

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.content.browser.input;
 
 import android.content.ClipboardManager;
 import android.content.Context;
 import android.content.res.TypedArray;
 import android.graphics.drawable.Drawable;
 import android.view.Gravity;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.view.ViewGroup;
 import android.view.ViewGroup.LayoutParams;
 import android.widget.PopupWindow;
 
 import com.google.common.annotations.VisibleForTesting;
 
+import org.chromium.content.browser.PositionObserver;
+
 /**
  * CursorController for inserting text at the cursor position.
  */
 public abstract class InsertionHandleController implements CursorController {
 
     /** The handle view, lazily created when first shown */
     private HandleView mHandle;
 
     /** The view over which the insertion handle should be shown */
     private View mParent;
 
     /** True iff the insertion handle is currently showing */
     private boolean mIsShowing;
 
     /** True iff the insertion handle can be shown automatically when selection changes */
     private boolean mAllowAutomaticShowing;
 
     private Context mContext;
 
-    public InsertionHandleController(View parent) {
+    private PositionObserver mPositionObserver;
+
+    public InsertionHandleController(View parent, PositionObserver positionObserver) {
         mParent = parent;
+
         mContext = parent.getContext();
+        mPositionObserver = positionObserver;
     }
 
     /** Allows the handle to be shown automatically when cursor position changes */
     public void allowAutomaticShowing() {
         mAllowAutomaticShowing = true;
     }
 
     /** Disallows the handle from being shown automatically when cursor position changes */
     public void hideAndDisallowAutomaticShowing() {
         hide();
@@ skipping 107 matching lines @@
 
     @Override
     public void onDetached() {}
 
     boolean canPaste() {
         return ((ClipboardManager)mContext.getSystemService(
                 Context.CLIPBOARD_SERVICE)).hasPrimaryClip();
     }
 
     private void createHandleIfNeeded() {
-        if (mHandle == null) mHandle = new HandleView(this, HandleView.CENTER, mParent);
+        if (mHandle == null) {
+            mHandle = new HandleView(this, HandleView.CENTER, mParent, mPositionObserver);
+        }
     }
 
     private void showHandleIfNeeded() {
         if (!mIsShowing) {
             mIsShowing = true;
             mHandle.show();
             setHandleVisibility(HandleView.VISIBLE);
         }
     }
 
@@ skipping 127 matching lines @@
             } else {
                 // Horizontal clipping
                 coords[0] = Math.max(0, coords[0]);
                 coords[0] = Math.min(screenWidth - width, coords[0]);
             }
 
             mContainer.showAtLocation(mParent, Gravity.NO_GRAVITY, coords[0], coords[1]);
         }
     }
 }