[code/emscripten] On emscripten, fixed waiting after a Python drawing.

The user can now push OK or Back to remove a Python drawing.

Change-Id: I293064a9458f8c0c6d0da5351500600fd9e82706

apps/code/console_controller.cpp

@@ -88,6 +88,12 @@ void ConsoleController::runAndPrintForCommand(const char * command) {
   m_consoleStore.pushCommand(command, strlen(command));
   assert(m_outputAccumulationBuffer[0] == '\0');
   runCode(command);
+#ifdef __EMSCRIPTEN__
+  if (isFramebufferModified()) {
+    app()->setFirstResponder(this);
+    return;
+  }
+#endif
   flushOutputAccumulationBufferToStore();
   m_consoleStore.deleteLastLineIfEmpty();
 }
@@ -104,16 +110,41 @@ void ConsoleController::removeExtensionIfAny(char * name) {
 
 void ConsoleController::viewWillAppear() {
   assert(pythonEnvironmentIsLoaded());
+#ifdef __EMSCRIPTEN__
+  if (isFramebufferModified()) {
+    return;
+  }
+#endif
   m_selectableTableView.reloadData();
   m_selectableTableView.selectCellAtLocation(0, m_consoleStore.numberOfLines());
   m_editCell.setEditing(true);
 }
 
 void ConsoleController::didBecomeFirstResponder() {
+#ifdef __EMSCRIPTEN__
+  if (isFramebufferModified()) {
+    return;
+  }
+#endif
   app()->setFirstResponder(&m_editCell);
 }
 
 bool ConsoleController::handleEvent(Ion::Events::Event event) {
+#ifdef __EMSCRIPTEN__
+  if (isFramebufferModified()) {
+    if (event == Ion::Events::OK || event == Ion::Events::Back) {
+      didCleanFramebuffer(),
+      m_view.markAsDirty();
+      flushOutputAccumulationBufferToStore();
+      m_consoleStore.deleteLastLineIfEmpty();
+      m_selectableTableView.reloadData();
+      m_selectableTableView.selectCellAtLocation(0, m_consoleStore.numberOfLines());
+      m_editCell.setEditing(true);
+      m_editCell.setText("");
+    }
+    return true;
+  }
+#endif
   if (event == Ion::Events::Up) {
     if (m_consoleStore.numberOfLines() > 0 && m_selectableTableView.selectedRow() == m_consoleStore.numberOfLines()) {
       m_editCell.setEditing(false);
@@ -227,6 +258,11 @@ bool ConsoleController::textFieldDidReceiveEvent(TextField * textField, Ion::Eve
 
 bool ConsoleController::textFieldDidFinishEditing(TextField * textField, const char * text, Ion::Events::Event event) {
   runAndPrintForCommand(text);
+#ifdef __EMSCRIPTEN__
+  if (isFramebufferModified()) {
+    return true;
+  }
+#endif
   m_selectableTableView.reloadData();
   m_editCell.setEditing(true);
   textField->setText("");

apps/code/script_template.cpp

@@ -28,7 +28,7 @@ def fibo2(n):
   return fibo2(n-1)+fibo2(n-2))");
 
 constexpr ScriptTemplate mandelbrotScriptTemplate("mandelbrot.py", R"(# This script draws a Mandelbrot fractal set
-# N_iteration: degree of precision
+#N_iteration: degree of precision
 import kandinsky
 def mandelbrot(N_iteration):
   for x in range(320):

python/port/port.cpp

@@ -41,6 +41,10 @@ void MicroPython::ExecutionEnvironment::didModifyFramebuffer() {
   m_framebufferHasBeenModified = true;
 }
 
+void MicroPython::ExecutionEnvironment::didCleanFramebuffer() {
+  m_framebufferHasBeenModified = false;
+}
+
 void MicroPython::ExecutionEnvironment::runCode(const char * str) {
   assert(sCurrentExecutionEnvironment == nullptr);
   sCurrentExecutionEnvironment = this;
@@ -93,6 +97,8 @@ void MicroPython::ExecutionEnvironment::runCode(const char * str) {
     /* End of mp_obj_print_exception. */
   }
 
+#ifdef __EMSCRIPTEN__
+#else
   while (m_framebufferHasBeenModified) {
     int timeout = 3000;
     Ion::Events::Event event = Ion::Events::getEvent(&timeout);
@@ -101,6 +107,7 @@ void MicroPython::ExecutionEnvironment::runCode(const char * str) {
       redraw();
     }
   }
+#endif
 
   assert(sCurrentExecutionEnvironment == this);
   sCurrentExecutionEnvironment = nullptr;

python/port/port.h

@@ -13,6 +13,8 @@ public:
   ExecutionEnvironment();
   static ExecutionEnvironment * currentExecutionEnvironment();
   void didModifyFramebuffer();
+  bool isFramebufferModified() const { return m_framebufferHasBeenModified; }
+  void didCleanFramebuffer();
   void runCode(const char * );
   virtual void printText(const char * text, size_t length) {
   }