[escher] create a class warning controller

Change-Id: I93dabe0d47a7b197cb32cf5ccac8411a181afbb7

escher/Makefile

@@ -40,6 +40,7 @@ objs += $(addprefix escher/src/,\
   tiled_view.o\
   view.o\
   view_controller.o\
+  warning_controller.o\
   window.o\
 )
 

escher/include/escher.h

@@ -39,6 +39,7 @@
 #include <escher/tiled_view.h>
 #include <escher/view.h>
 #include <escher/view_controller.h>
+#include <escher/warning_controller.h>
 #include <escher/window.h>
 
 #endif

escher/include/escher/warning_controller.h

@@ -0,0 +1,33 @@
+#ifndef ESCHER_WARNING_CONTROLLER_H
+#define ESCHER_WARNING_CONTROLLER_H
+
+#include <escher/view_controller.h>
+#include <escher/pointer_text_view.h>
+#include <escher/solid_color_view.h>
+
+class WarningController : public ViewController {
+public:
+  WarningController(Responder * parentResponder);
+  void setLabel(const char *);
+  const char * title() const override;
+  View * view() override;
+  bool handleEvent(Ion::Events::Event event) override;
+private:
+  class ContentView : public SolidColorView {
+  public:
+    ContentView();
+    void setLabel(const char *);
+    int numberOfSubviews() const override;
+    View * subviewAtIndex(int index) override;
+    void layoutSubviews() override;
+    KDSize minimalSizeForOptimalDisplay() override;
+  private:
+    constexpr static KDCoordinate k_verticalMargin = 40;
+    constexpr static KDCoordinate k_horizontalMargin = 20;
+    PointerTextView m_textView;
+  };
+
+  ContentView m_contentView;
+};
+
+#endif

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;
+}