fix #41: Do not start the event loop during destruction of ProjectLoader

Author: adazem009

ScratchCPPGui/projectloader.cpp

@@ -43,6 +43,8 @@ ProjectLoader::ProjectLoader(QObject *parent) :
 
 ProjectLoader::~ProjectLoader()
 {
+    m_stopLoading = true;
+
     if (m_loadThread.isRunning())
         m_loadThread.waitForFinished();
 
@@ -88,6 +90,7 @@ void ProjectLoader::setFileName(const QString &newFileName)
     emit loadStatusChanged();
     emit fileNameChanged();
 
+    m_stopLoading = false;
     m_loadThread = QtConcurrent::run(&callLoad, this);
 }
 
@@ -193,7 +196,8 @@ void ProjectLoader::load()
 
     m_sprites.clear();
 
-    if (!m_engine) {
+    if (!m_engine || m_stopLoading) {
+        m_engineMutex.unlock();
         emit fileNameChanged();
         emit loadStatusChanged();
         emit loadingFinished();
@@ -226,6 +230,16 @@ void ProjectLoader::load()
         }
     }
 
+    if (m_stopLoading) {
+        m_engineMutex.unlock();
+        emit fileNameChanged();
+        emit loadStatusChanged();
+        emit loadingFinished();
+        emit engineChanged();
+        emit spritesChanged();
+        return;
+    }
+
     // Run event loop
     m_engine->setSpriteFencingEnabled(false);
 

ScratchCPPGui/projectloader.h

@@ -123,6 +123,7 @@ class ProjectLoader : public QObject
         bool m_eventLoopEnabled = true;
         std::atomic<unsigned int> m_downloadedAssets = 0;
         std::atomic<unsigned int> m_assetCount = 0;
+        std::atomic<bool> m_stopLoading = false;
 };
 
 } // namespace scratchcppgui