[escher] create a class warning controller

Change-Id: I93dabe0d47a7b197cb32cf5ccac8411a181afbb7

escher/src/warning_controller.cpp

@@ -0,0 +1,52 @@
+#include <escher/warning_controller.h>
+#include <escher/app.h>
+
+WarningController::ContentView::ContentView() :
+  SolidColorView(KDColorBlack),
+  m_textView(PointerTextView("", 0.5f, 0.5f, KDColorWhite, KDColorBlack))
+{
+}
+
+void WarningController::ContentView::setLabel(const char * label) {
+  m_textView.setText(label);
+}
+
+int WarningController::ContentView::numberOfSubviews() const {
+  return 1;
+}
+
+View * WarningController::ContentView::subviewAtIndex(int index) {
+  return &m_textView;
+}
+
+void WarningController::ContentView::layoutSubviews() {
+  m_textView.setFrame(bounds());
+}
+
+KDSize WarningController::ContentView::minimalSizeForOptimalDisplay() {
+  KDSize textSize = m_textView.minimalSizeForOptimalDisplay();
+  return KDSize(textSize.width() + k_horizontalMargin, textSize.height() + k_verticalMargin);
+}
+
+WarningController::WarningController(Responder * parentResponder) :
+  ViewController(parentResponder),
+  m_contentView(ContentView())
+{
+}
+
+void WarningController::setLabel(const char * label) {
+  m_contentView.setLabel(label);
+}
+
+const char * WarningController::title() const {
+  return "Attention";
+}
+
+View * WarningController::view() {
+  return &m_contentView;
+}
+
+bool WarningController::handleEvent(Ion::Events::Event event) {
+  app()->dismissModalViewController();
+  return true;
+}