[escher] Add a PointerTextView class

escher/src/pointer_text_view.cpp

@@ -0,0 +1,20 @@
+#include <escher/pointer_text_view.h>
+#include <assert.h>
+
+PointerTextView::PointerTextView(KDText::FontSize size, const char * text, float horizontalAlignment, float verticalAlignment,
+    KDColor textColor, KDColor backgroundColor) :
+  TextView(size, horizontalAlignment, verticalAlignment, textColor, backgroundColor),
+  m_text(text)
+{
+}
+
+void PointerTextView::setText(const char * text) {
+  if (text != m_text) {
+    m_text = text;
+    markRectAsDirty(bounds());
+  }
+}
+
+KDSize PointerTextView::minimalSizeForOptimalDisplay() const  {
+  return KDText::stringSize(text(), m_fontSize);
+}