C++: handle file type changes for choosing highlighters.

If the file type (mime type) of an editor changes, it might need a
different kind of highlighter/highlighting-support.

Change-Id: I470dbf69e71856c9593d201416c4d4bd2958aaec
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>

1 files changed, 18 insertions, 7 deletions

diff --git a/src/plugins/cpptools/cpptoolseditorsupport.cpp b/src/plugins/cpptools/cpptoolseditorsupport.cpp
index 01001fee76..45d970d475 100644
--- a/src/plugins/cpptools/cpptoolseditorsupport.cpp
+++ b/src/plugins/cpptools/cpptoolseditorsupport.cpp
@@ -115,16 +115,10 @@ CppEditorSupport::CppEditorSupport(CppModelManager *modelManager, BaseTextEditor
     , m_cachedContentsEditorRevision(-1)
     , m_initialized(false)
     , m_lastHighlightRevision(0)
-    , m_highlightingSupport(modelManager->highlightingSupport(textEditor))
 {
     connect(m_modelManager, SIGNAL(documentUpdated(CPlusPlus::Document::Ptr)),
             this, SLOT(onDocumentUpdated(CPlusPlus::Document::Ptr)));
 
-    if (m_highlightingSupport && m_highlightingSupport->requiresSemanticInfo()) {
-        connect(this, SIGNAL(semanticInfoUpdated(CppTools::SemanticInfo)),
-                this, SLOT(startHighlighting()));
-    }
-
     m_updateDocumentTimer = new QTimer(this);
     m_updateDocumentTimer->setSingleShot(true);
     m_updateDocumentTimer->setInterval(m_updateDocumentInterval);
@@ -139,7 +133,8 @@ CppEditorSupport::CppEditorSupport(CppModelManager *modelManager, BaseTextEditor
     connect(m_textEditor, SIGNAL(contentsChanged()), this, SLOT(updateDocument()));
     connect(this, SIGNAL(diagnosticsChanged()), this, SLOT(onDiagnosticsChanged()));
 
-    updateDocument();
+    connect(m_textEditor->document(), SIGNAL(mimeTypeChanged()),
+            this, SLOT(onMimeTypeChanged()));
 }
 
 CppEditorSupport::~CppEditorSupport()
@@ -486,3 +481,19 @@ void CppEditorSupport::recalculateSemanticInfoDetached_helper(QFutureInterface<v
     TLDProc tldProc(future);
     recalculateSemanticInfoNow(source, true, &tldProc);
 }
+
+void CppEditorSupport::onMimeTypeChanged()
+{
+    m_highlighter.cancel();
+    m_highlighter.waitForFinished();
+
+    m_highlightingSupport.reset(m_modelManager->highlightingSupport(m_textEditor));
+
+    disconnect(this, SIGNAL(semanticInfoUpdated(CppTools::SemanticInfo)),
+               this, SLOT(startHighlighting()));
+    if (m_highlightingSupport && m_highlightingSupport->requiresSemanticInfo())
+        connect(this, SIGNAL(semanticInfoUpdated(CppTools::SemanticInfo)),
+                this, SLOT(startHighlighting()));
+
+    updateDocumentNow();
+}