Escher: Use a scrollview

Change-Id: I24c754a7ea860b79d1d660adfbf143ed0e42c8a5

escher/Makefile

@@ -4,6 +4,7 @@ objs += $(addprefix escher/src/,\
   app.o\
   childless_view.o\
   responder.o\
+  scroll_view.o\
   solid_color_view.o\
   tab_view.o\
   tab_view_cell.o\

escher/include/escher/scroll_view.h

@@ -0,0 +1,27 @@
+#ifndef ESCHER_SCROLL_VIEW_H
+#define ESCHER_SCROLL_VIEW_H
+
+#include <escher/view.h>
+
+class ScrollView : public View {
+public:
+  ScrollView(View * contentView);
+
+  int numberOfSubviews() const override;
+  const View * subview(int index) const override;
+  void storeSubviewAtIndex(View * view, int index) override;
+  void layoutSubviews() override;
+
+  void setContentOffset(KDPoint offset);
+protected:
+#if ESCHER_VIEW_LOGGING
+  virtual const char * className() const;
+  virtual void logAttributes(std::ostream &os) const;
+#endif
+private:
+  KDPoint m_offset;
+  View * m_contentView;
+  //ScollIndicator m_verticalScrollIndicator;
+};
+
+#endif

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