Allow calling signals from Python (Fixes #98)

src/qpython_priv.cpp

@@ -390,6 +390,20 @@ pyotherside_QObjectMethod_call(PyObject *callable_object, PyObject *args, PyObje
         QMetaMethod method = metaObject->method(i);
 
         if (method.name() == ref->method()) {
+            if (method.methodType() == QMetaMethod::Signal) {
+                // Signals can't be called directly, we just return true or
+                // false depending on whether method.invoke() worked or not
+                bool result = method.invoke(o, Qt::AutoConnection,
+                        genericArguments.value(0),
+                        genericArguments.value(1), genericArguments.value(2),
+                        genericArguments.value(3), genericArguments.value(4),
+                        genericArguments.value(5), genericArguments.value(6),
+                        genericArguments.value(7), genericArguments.value(8),
+                        genericArguments.value(9));
+
+                return convertQVariantToPyObject(result);
+            }
+
             QVariant result;
             if (method.invoke(o, Qt::DirectConnection,
                     Q_RETURN_ARG(QVariant, result), genericArguments.value(0),

tests/test_call_signal/TestModule.py

@@ -0,0 +1,5 @@
+import pyotherside
+
+def makeCalls(obj):
+    print(f'result of callFunction: {obj.callFunction()}')
+    print(f'result of callSignal: {obj.callSignal()}')

tests/test_call_signal/test.qml

@@ -0,0 +1,31 @@
+import QtQuick 2.9
+import io.thp.pyotherside 1.5
+
+Item {
+id: obj
+
+    signal callSignal()
+
+    function callFunction() {
+        print('Function Called')
+        return 'hoho'
+    }
+
+    function signalConnection(){
+    	print('Signal Called')
+    }
+
+    Component.onCompleted: {
+        obj.callSignal.connect(signalConnection)
+    }
+
+    Python {
+        Component.onCompleted: {
+            addImportPath(Qt.resolvedUrl('.'));
+
+            importModule('TestModule', function(){
+                call('TestModule.makeCalls', [obj])
+            })
+        }
+    }
+}