Escher: Adding Window, ViewController and TabViewController

Change-Id: I6a13fe95e846cfcc43f783e8b4d88ea4ad9ee585

escher/src/tab_view_controller.cpp

@@ -0,0 +1,67 @@
+extern "C" {
+#include <assert.h>
+}
+#include <escher/tab_view_controller.h>
+
+TabViewController::ContentView::ContentView(TabViewController * vc) :
+  View(),
+  m_tabView(TabView(vc)),
+  m_activeView(nullptr)
+{
+};
+
+void TabViewController::ContentView::setActiveView(View * view) {
+  setSubview(view, 1);
+}
+
+void TabViewController::ContentView::layoutSubviews() {
+  if (m_activeView) {
+    m_activeView->setFrame(this->bounds());
+  }
+}
+
+int TabViewController::ContentView::numberOfSubviews() {
+  return 2;
+}
+
+View * TabViewController::ContentView::subview(int index) {
+  if (index == 0) {
+    return &m_tabView;
+  } else {
+    assert(index == 1);
+    return m_activeView;
+  }
+}
+
+void TabViewController::ContentView::ContentView::storeSubviewAtIndex(View * view, int index) {
+  assert(index == 1);
+  m_activeView = view;
+}
+
+TabViewController::TabViewController(ViewController ** children) :
+  m_children(children),
+  m_activeChildIndex(0),
+  m_view(ContentView(this))
+{
+  setActiveTab(0);
+}
+
+void TabViewController::setActiveTab(uint8_t i) {
+  if (i == m_activeChildIndex) {
+    return;
+  }
+  //TODO assert(i <= m_numberOfchildren);
+  ViewController * activeVC = m_children[i];
+  m_view.setActiveView(activeVC->view());
+  m_activeChildIndex = i;
+  m_view.redraw();
+  //m_tabView.redraw();
+}
+
+View * TabViewController::view() {
+  return &m_view;
+}
+
+void TabViewController::handleKeyEvent(int key) {
+  // Switch tabs!
+}