Escher: Use a scrollview

Change-Id: I24c754a7ea860b79d1d660adfbf143ed0e42c8a5

escher/src/scroll_view.cpp

@@ -0,0 +1,46 @@
+#include <escher/scroll_view.h>
+extern "C" {
+#include <assert.h>
+}
+
+ScrollView::ScrollView(View * contentView) :
+  View(),
+  m_offset(KDPointZero),
+  m_contentView(contentView)
+{
+  setSubview(m_contentView, 0);
+  //setSubview(&m_verticalScrollIndicator, 1);
+}
+
+int ScrollView::numberOfSubviews() const {
+  return 1;
+}
+
+const View * ScrollView::subview(int index) const {
+  assert(index == 0);
+  return m_contentView;
+}
+
+void ScrollView::storeSubviewAtIndex(View * view, int index) {
+  assert(index == 0);
+  m_contentView = view;
+}
+
+void ScrollView::layoutSubviews() {
+  // Layout indicators
+  // TODO
+  // Layout contentview
+  // FIXME: Use KDCoordinateMax
+  m_contentView->setFrame({m_offset.x, m_offset.y, (KDCoordinate)9999, (KDCoordinate)9999});
+}
+
+#if ESCHER_VIEW_LOGGING
+const char * ScrollView::className() const {
+  return "ScrollView";
+}
+
+void ScrollView::logAttributes(std::ostream &os) const {
+  View::logAttributes(os);
+  os << " offset=\"" << (int)m_offset.x << "," << (int)m_offset.y << "\"";
+}
+#endif