Wrap CalculatorText in custom HorizontalScrollView.

Bug: 15725073

This allows numbers to draw right up to the edge while
still maintaining left/right padding inside the containing TextView.

Change-Id: I86f2b2f7f0b2258b6790ed0a432f6d03d5656e31
diff --git a/src/com/android/calculator2/CalculatorText.java b/src/com/android/calculator2/CalculatorText.java
index ec45123..f03dfc3 100644
--- a/src/com/android/calculator2/CalculatorText.java
+++ b/src/com/android/calculator2/CalculatorText.java
@@ -23,7 +23,6 @@
 import android.graphics.Rect;
 import android.text.Layout;
 import android.text.TextPaint;
-import android.text.method.ScrollingMovementMethod;
 import android.util.AttributeSet;
 import android.util.TypedValue;
 import android.view.ActionMode;
@@ -38,6 +37,8 @@
  */
 public class CalculatorText extends AlignedTextView implements View.OnLongClickListener {
 
+    public static final String TAG_ACTION_MODE = "ACTION_MODE";
+
     private final ActionMode.Callback2 mPasteActionModeCallback = new ActionMode.Callback2() {
 
         @Override
@@ -52,6 +53,7 @@
 
         @Override
         public boolean onCreateActionMode(ActionMode mode, Menu menu) {
+            mode.setTag(TAG_ACTION_MODE);
             final ClipboardManager clipboard = (ClipboardManager) getContext()
                     .getSystemService(Context.CLIPBOARD_SERVICE);
             if (clipboard.hasPrimaryClip()) {
@@ -120,12 +122,6 @@
                 (mMaximumTextSize - mMinimumTextSize) / 3);
         a.recycle();
 
-        // Allow scrolling by default.
-        setMovementMethod(ScrollingMovementMethod.getInstance());
-
-        // Reset the clickable flag, which is added when specifying a movement method.
-        setClickable(false);
-
         // Add a long click to start the ActionMode manually.
         setOnLongClickListener(this);
     }
@@ -157,8 +153,6 @@
         super.onMeasure(widthMeasureSpec, heightMeasureSpec);
     }
 
-    public int getWidthConstraint() { return mWidthConstraint; }
-
     @Override
     protected void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) {
         super.onTextChanged(text, start, lengthBefore, lengthAfter);