Allow signal parameters which are custom QML object-types

This commit allows lazy resolution of signal parameter types, which
allows QML object types to be used as signal parameters.  If a signal
is emitted with an incorrect parameter type, it will be passed through
as a null parameter.

Task-number: QTBUG-14550
Change-Id: I7e899ad57452826cc405bed10c541f8d35789d04
Reviewed-by: Martin Jones <martin.jones@nokia.com>

1 files changed, 44 insertions, 0 deletions

diff --git a/tests/auto/qml/qqmllanguage/data/signalParameterTypes.1.qml b/tests/auto/qml/qqmllanguage/data/signalParameterTypes.1.qml
new file mode 100644
index 0000000000..e3d4008962
--- /dev/null
+++ b/tests/auto/qml/qqmllanguage/data/signalParameterTypes.1.qml
@@ -0,0 +1,44 @@
+import QtQml 2.0
+
+QtObject {
+    id: root
+
+    property bool success: false
+    property bool gotInvalid: false
+    property bool expectNull: false
+    property SignalEmitter e: SignalEmitter { testObject: root; handleSignal: true }
+
+    function determineSuccess(param) {
+        if (root.expectNull == true) {
+            if (param != null) {
+                // the parameter shouldn't have been passed through, but was.
+                root.success = false;
+                root.gotInvalid = true;
+            } else {
+                root.success = true;
+                root.gotInvalid = false;
+            }
+            return;
+        } else if (param == null) {
+            // the parameter should have been passed through, but wasn't.
+            root.success = false;
+            return;
+        }
+
+        if (param.testProperty == 42) {
+            // got the expected value.  if we didn't previously
+            // get an unexpected value, set success to true.
+            root.success = (!root.gotInvalid);
+        } else {
+             // the value passed through was not what we expected.
+            root.gotInvalid = true;
+            root.success = false;
+        }
+    }
+
+    Component.onCompleted: {
+        success = false;
+        e.emitTestSignal();
+        // the handler in the SignalEmitter should call determineSuccess.
+    }
+}