Dialog window to ask whether to keep current project or re-load from disk when .jucer file changes

extras/Projucer/Source/Application/jucer_MainWindow.cpp

@@ -276,6 +276,29 @@ void MainWindow::activeWindowStatusChanged()
         pcc->updateMissingFileStatuses();
 
     ProjucerApplication::getApp().openDocumentManager.reloadModifiedFiles();
+
+    if (Project* p = getProject())
+    {
+        if (p->hasProjectBeenModified())
+        {
+            const int r = AlertWindow::showOkCancelBox (AlertWindow::QuestionIcon,
+                                                           TRANS (".jucer file has been modified since last save."),
+                                                           TRANS ("Do you want to keep current project or re-load from disk?"),
+                                                           TRANS ("Keep"),
+                                                           TRANS ("Re-load from disk"));
+
+            if (r == 0)
+            {
+                File projectFile = p->getFile();
+                setProject (nullptr);
+                openFile (projectFile);
+            }
+            else if (r == 1)
+            {
+                ProjucerApplication::getApp().getCommandManager().invokeDirectly (CommandIDs::saveProject, true);
+            }
+        }
+    }
 }
 
 void MainWindow::updateTitle (const String& documentName)

extras/Projucer/Source/Project Saving/jucer_ProjectSaver.h

@@ -104,6 +104,8 @@ public:
             return Result::fail (errors[0]);
         }
 
+        project.updateModificationTime();
+
         return Result::ok();
     }
 

extras/Projucer/Source/Project/jucer_Project.cpp

@@ -59,6 +59,8 @@ Project::Project (const File& f)
     setChangedFlag (false);
 
     projectRoot.addListener (this);
+
+    modificationTime = getFile().getLastModificationTime();
 }
 
 Project::~Project()
@@ -374,6 +376,20 @@ void Project::valueTreeChildRemoved (ValueTree&, ValueTree&, int)   { changed();
 void Project::valueTreeChildOrderChanged (ValueTree&, int, int)     { changed(); }
 void Project::valueTreeParentChanged (ValueTree&)                   {}
 
+//==============================================================================
+bool Project::hasProjectBeenModified()
+{
+    Time newModificationTime = getFile().getLastModificationTime();
+
+    if (newModificationTime != modificationTime)
+    {
+        modificationTime = newModificationTime;
+        return true;
+    }
+
+    return false;
+}
+
 //==============================================================================
 File Project::resolveFilename (String filename) const
 {

extras/Projucer/Source/Project/jucer_Project.h

@@ -311,6 +311,10 @@ public:
     //==============================================================================
     static const char* projectFileExtension;
 
+    //==============================================================================
+    bool hasProjectBeenModified();
+    void updateModificationTime() { modificationTime = getFile().getLastModificationTime(); }
+
 private:
     //==============================================================================
     void setMissingAudioPluginDefaultValues();
@@ -334,6 +338,8 @@ private:
     void updateOldModulePaths();
     void warnAboutOldProjucerVersion();
 
+    Time modificationTime;
+
     JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (Project)
 };