signals: Increase compatibility by providing a signatures attribute

[ChangeLog][PySide6] A `signatures` attribute was added to the Signal
type in order to increase compatibility with other implementations.

Task-number: PYSIDE-1113
Change-Id: I7b97e38feaff5a0db8a82a26f52fb6ecadab08d2
Fixes: PYSIDE-1713
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
(cherry picked from commit 1e47cdbd77ed2c95f520aaa8b856bb05f4076a89)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

1 files changed, 21 insertions, 1 deletions

diff --git a/sources/pyside6/libpyside/pysidesignal.cpp b/sources/pyside6/libpyside/pysidesignal.cpp
index 8a32bf005..15c8dcae1 100644
--- a/sources/pyside6/libpyside/pysidesignal.cpp
+++ b/sources/pyside6/libpyside/pysidesignal.cpp
@@ -106,6 +106,7 @@ static int signalTpInit(PyObject *, PyObject *, PyObject *);
 static void signalFree(void *);
 static void signalInstanceFree(void *);
 static PyObject *signalGetItem(PyObject *self, PyObject *key);
+static PyObject *signalGetAttr(PyObject *self, PyObject *name);
 static PyObject *signalToString(PyObject *self);
 static PyObject *signalDescrGet(PyObject *self, PyObject *obj, PyObject *type);
 
@@ -153,6 +154,7 @@ static PyTypeObject *PySideMetaSignal_TypeF(void)
 
 static PyType_Slot PySideSignalType_slots[] = {
     {Py_mp_subscript,   reinterpret_cast<void *>(signalGetItem)},
+    {Py_tp_getattro,    reinterpret_cast<void *>(signalGetAttr)},
     {Py_tp_descr_get,   reinterpret_cast<void *>(signalDescrGet)},
     {Py_tp_call,        reinterpret_cast<void *>(signalCall)},
     {Py_tp_str,         reinterpret_cast<void *>(signalToString)},
@@ -301,12 +303,30 @@ static PyObject *signalGetItem(PyObject *obSelf, PyObject *key)
     return Shiboken::String::fromCString(sig.constData());
 }
 
-
 static PyObject *signalToString(PyObject *self)
 {
     return signalGetItem(self, nullptr);
 }
 
+static PyObject *signalGetAttr(PyObject *obSelf, PyObject *name)
+{
+    auto self = reinterpret_cast<PySideSignal *>(obSelf);
+
+    if (PyUnicode_CompareWithASCIIString(name, "signatures") != 0)
+        return PyObject_GenericGetAttr(obSelf, name);
+
+    auto nelems = self->data->signatures.count();
+    PyObject *tuple = PyTuple_New(nelems);
+
+    for (Py_ssize_t idx = 0; idx < nelems; ++idx) {
+        QByteArray sigKey = self->data->signatures.at(idx).signature;
+        auto sig = PySide::Signal::buildSignature(self->data->signalName, sigKey);
+        PyObject *entry = Shiboken::String::fromCString(sig.constData());
+        PyTuple_SetItem(tuple, idx, entry);
+    }
+    return tuple;
+}
+
 static void signalInstanceFree(void *vself)
 {
     auto pySelf = reinterpret_cast<PyObject *>(vself);