Add support for parameterNames in Signals

There were many uses cases when a proper interaction
between Python and Qml was needed, one of them was
the case to emit signals from Python an get those values
via an argument name in QML.

A simple example describing this situation can be found
in PYSIDE-634:

Python:
    sumResult = Signal(int, arguments=["sum"])
    sumResult.emit(42)
Qml:
    onSumResult: console.log(sum) // will print 42

A test case based on the same example was added.

Change-Id: I0908f97d88eaadc0c02d81bc4daca936f72f6c6a
Fixes: PYSIDE-634
Reviewed-by: Christian Tismer <tismer@stackless.com>

1 files changed, 59 insertions, 0 deletions

diff --git a/sources/pyside2/tests/QtQml/signal_arguments.qml b/sources/pyside2/tests/QtQml/signal_arguments.qml
new file mode 100644
index 000000000..0c65b947f
--- /dev/null
+++ b/sources/pyside2/tests/QtQml/signal_arguments.qml
@@ -0,0 +1,59 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the test suite of Qt for Python.
+**
+** $QT_BEGIN_LICENSE:GPL-EXCEPT$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+
+import QtQuick 2.5
+import QtQuick.Controls 1.4
+import QtQuick.Layouts 1.2
+
+Rectangle {
+    visible: true
+    GridLayout {
+        Button {
+            id: "button"
+            objectName: "button"
+            text: "sum!"
+            onClicked: {
+                o.sum(40, 2)
+            }
+        }
+        Text {
+            id: sumResultText
+        }
+    }
+    Connections {
+        target: o
+        onSumResult: {
+            // set the value on the Qml side
+            sumResultText.text = sum
+            // set internal Python value from the already
+            // modified value
+            o.sendValue(sumResultText.text)
+        }
+    }
+}