Support dragging and dropping of files onto app icon

Tested on macos and windows.  Drag and drop files onto either the dock icon or task bar icon once SavvyCCAN is running

Info.plist.template

@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleExecutable</key>
+	<string>${EXECUTABLE_NAME}</string>
+	<key>CFBundleIconFile</key>
+	<string>${ASSETCATALOG_COMPILER_APPICON_NAME}</string>
+	<key>CFBundleIdentifier</key>
+	<string>${PRODUCT_BUNDLE_IDENTIFIER}</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleSignature</key>
+	<string>${QMAKE_PKGINFO_TYPEINFO}</string>
+	<key>LSMinimumSystemVersion</key>
+	<string>${MACOSX_DEPLOYMENT_TARGET}</string>
+	<key>NSPrincipalClass</key>
+	<string>NSApplication</string>
+	<key>NSSupportsAutomaticGraphicsSwitching</key>
+	<true/>
+	<key>CFBundleDocumentTypes</key>
+	<array>
+		<dict>
+			<key>CFBundleTypeExtensions</key>
+			<array>
+          <string>asc</string>
+          <string>avc</string>
+          <string>blf</string>
+          <string>can</string>
+          <string>crt</string>
+          <string>crtd</string>
+          <string>csv</string>
+          <string>evc</string>
+          <string>log</string>
+          <string>qcc</string>
+          <string>trace</string>
+          <string>trc</string>
+          <string>txt</string>
+			</array>
+			<key>CFBundleTypeRole</key>
+			<string>Viewer</string>
+		</dict>
+	</array>
+</dict>
+</plist>

SavvyCAN.pro

@@ -16,6 +16,9 @@ DEFINES += QCUSTOMPLOT_USE_OPENGL
 TARGET = SavvyCAN
 TEMPLATE = app
 
+QMAKE_INFO_PLIST = Info.plist.template
+ICON = icons/SavvyIcon.icns
+
 SOURCES += main.cpp\
     connections/mqtt_bus.cpp \
     mqtt/qmqtt_client.cpp \

main.cpp

@@ -1,9 +1,30 @@
 #include "mainwindow.h"
 #include <QApplication>
 
+class SavvyCANApplication : public QApplication
+{
+public:
+    MainWindow *mainWindow;
+    
+    SavvyCANApplication(int &argc, char **argv) : QApplication(argc, argv)
+    {
+    }
+
+    bool event(QEvent *event) override
+    {
+        if (event->type() == QEvent::FileOpen)
+        {
+            QFileOpenEvent *openEvent = static_cast<QFileOpenEvent *>(event);
+            mainWindow->handleDroppedFile(openEvent->file());
+        }
+
+        return QApplication::event(event);
+    }
+};
+
 int main(int argc, char *argv[])
 {
-    QApplication a(argc, argv);
+    SavvyCANApplication a(argc, argv);
 
     //Add a local path for Qt extensions, to allow for per-application extensions.
     a.addLibraryPath("plugins");
@@ -14,7 +35,7 @@ int main(int argc, char *argv[])
     a.setOrganizationDomain("evtv.me");
     QSettings::setDefaultFormat(QSettings::IniFormat);
 
-    MainWindow w;
+    a.mainWindow = new MainWindow();
 
     QSettings settings;
     int fontSize = settings.value("Main/FontSize", 9).toUInt();
@@ -22,7 +43,11 @@ int main(int argc, char *argv[])
     sysFont.setPointSize(fontSize);
     a.setFont(sysFont);
 
-    w.show();
+    a.mainWindow->show();
 
-    return a.exec();
+    int retCode = a.exec();
+    
+    delete a.mainWindow; a.mainWindow = NULL;
+    
+    return retCode;
 }

mainwindow.cpp

@@ -807,6 +807,50 @@ void MainWindow::handleLoadFile()
     }
 }
 
+void MainWindow::handleDroppedFile(const QString &filename)
+{
+    QProgressDialog progress(qApp->activeWindow());
+    progress.setWindowModality(Qt::WindowModal);
+    progress.setLabelText("Loading file...");
+    progress.setCancelButton(nullptr);
+    progress.setRange(0,0);
+    progress.setMinimumDuration(0);
+    progress.show();
+    
+    QVector<CANFrame> loadedFrames;
+    bool loadResult = FrameFileIO::autoDetectLoadFile(filename, &loadedFrames);
+    
+    progress.cancel();
+    
+    if (!loadResult)
+    {
+        if (loadedFrames.count() > 0) //only ask if at least one frame was decoded.
+        {
+            QMessageBox::StandardButton confirmDialog = QMessageBox::question(this, "Error Loading", "Do you want to salvage what could be loaded?",
+                                      QMessageBox::Yes|QMessageBox::No);
+            if (confirmDialog == QMessageBox::Yes)
+            {
+                loadResult = true;
+            }
+        }
+    }
+
+    if (loadResult)
+    {
+        ui->canFramesView->scrollToTop();
+        model->clearFrames();
+        model->insertFrames(loadedFrames);
+        loadedFileName = filename;
+        model->recalcOverwrite();
+        ui->lbNumFrames->setText(QString::number(model->rowCount()));
+        if (ui->cbAutoScroll->isChecked()) ui->canFramesView->scrollToBottom();
+
+        updateFileStatus();
+        emit framesUpdated(-1);
+    }
+}
+
+
 void MainWindow::handleSaveFile()
 {
     QString filename;

mainwindow.h

@@ -54,6 +54,8 @@ public:
     CANFrameModel * getCANFrameModel();
     ~MainWindow();
 
+    void handleDroppedFile(const QString &filename);
+
 private slots:
     void handleLoadFile();
     void handleSaveFile();