[code] Auto indentation in the script editor.

Change-Id: I7066c41fa53068e6f18a5ad226b5e72f591f02e2

apps/code/editor_controller.cpp

@@ -5,13 +5,14 @@ namespace Code {
 
 EditorController::EditorController(ScriptParameterController * scriptParameterController) :
   ViewController(nullptr),
-  m_view(this),
+  m_textArea(this),
   m_scriptParameterController(scriptParameterController)
 {
+  m_textArea.setDelegate(this);
 }
 
 void EditorController::setScript(Script script){
-  m_view.setText(script.editableContent(), script.contentBufferSize());
+  m_textArea.setText(script.editableContent(), script.contentBufferSize());
 }
 
 bool EditorController::handleEvent(Ion::Events::Event event) {
@@ -23,11 +24,78 @@ bool EditorController::handleEvent(Ion::Events::Event event) {
 }
 
 void EditorController::didBecomeFirstResponder() {
-  app()->setFirstResponder(&m_view);
+  app()->setFirstResponder(&m_textArea);
 }
 
 void EditorController::viewDidDisappear() {
   m_scriptParameterController->scriptContentEditionDidFinish();
 }
 
+bool EditorController::textAreaShouldFinishEditing(TextArea * textArea, Ion::Events::Event event) {
+  return false;
+}
+
+bool EditorController::textAreaDidReceiveEvent(TextArea * textArea, Ion::Events::Event event) {
+  if (event == Ion::Events::EXE) {
+    // Auto-Indent
+    char * text = const_cast<char *>(textArea->text());
+    int charBeforeCursorIndex = textArea->cursorLocation()-1;
+    int indentationSize = 0;
+    // Indent more if the previous line ends with ':'.
+    if (charBeforeCursorIndex >= 0 && text[charBeforeCursorIndex] == ':') {
+      indentationSize += k_indentationSpacesNumber;
+    }
+    // Compute the indentation of the current line.
+    int indentationIndex = charBeforeCursorIndex;
+    while (indentationIndex >= 0 && text[indentationIndex] != '\n') {
+      indentationIndex--;
+    }
+    if (indentationIndex >= 0) {
+      indentationIndex++;
+      while (text[indentationIndex] == ' ') {
+        indentationSize++;
+        indentationIndex++;
+      }
+    }
+    textArea->insertText("\n");
+    for (int i = 0; i < indentationSize; i++) {
+      textArea->insertText(" ");
+    }
+    return true;
+  } else if (event == Ion::Events::Backspace) {
+    // If the cursor is on the left of the text of a line,
+    // backspace one intentation space at a time.
+    char * text = const_cast<char *>(textArea->text());
+    int charBeforeCursorIndex = textArea->cursorLocation()-1;
+    int indentationSize = 0;
+    while (charBeforeCursorIndex >= 0 && text[charBeforeCursorIndex] == ' ') {
+      charBeforeCursorIndex--;
+      indentationSize++;
+    }
+    if (charBeforeCursorIndex >= 0 && text[charBeforeCursorIndex] == '\n'
+        && indentationSize >= k_indentationSpacesNumber)
+    {
+      for (int i = 0; i < k_indentationSpacesNumber; i++) {
+        textArea->removeChar();
+      }
+      return true;
+    }
+  } else if (event == Ion::Events::Space) {
+    // If the cursor is on the left of the text of a line,
+    // a space triggers an indentation.
+    char * text = const_cast<char *>(textArea->text());
+    int charBeforeCursorIndex = textArea->cursorLocation()-1;
+    while (charBeforeCursorIndex >= 0 && text[charBeforeCursorIndex] == ' ') {
+      charBeforeCursorIndex--;
+    }
+    if (charBeforeCursorIndex >= 0 && text[charBeforeCursorIndex] == '\n') {
+      for (int i = 0; i < k_indentationSpacesNumber; i++) {
+        textArea->insertText(" ");
+      }
+      return true;
+    }
+  }
+  return false;
+}
+
 }