symbolic calculations added

res/layout/calc_display.xml

@@ -10,7 +10,6 @@
 		xmlns:a="http://schemas.android.com/apk/res/android"
 		a:id="@+id/calculatorDisplay"
 		style="@style/display_style"
-		a:layout_weight="1"
 		a:minLines="1"
 		a:maxLines="1"
 		a:textStyle="bold"

res/layout/calc_empty_button.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<!--
+  ~ Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+  ~ For more information, please, contact se.solovyev@gmail.com
+  ~ or visit http://se.solovyev.org
+  -->
+<org.solovyev.android.view.widgets.DirectionDragButton xmlns:a="http://schemas.android.com/apk/res/android"
+													   xmlns:calc="http://schemas.android.com/apk/res/org.solovyev.android.calculator"
+													   style="?controlButtonStyle"/>

res/layout/calc_equals_button.xml

@@ -7,8 +7,11 @@
   -->
 <org.solovyev.android.view.widgets.DirectionDragButton
 		xmlns:a="http://schemas.android.com/apk/res/android"
+		xmlns:calc="http://schemas.android.com/apk/res/org.solovyev.android.calculator"
 		a:id="@+id/equalsButton"
+		calc:textUp="≡"
 		a:text="="
+		calc:directionTextScale="0.5"
 		a:layout_width="fill_parent"
 		a:layout_height="fill_parent"
 		style="?controlButtonStyle"