1 files changed, 51 insertions, 0 deletions
diff --git a/examples/corelib/bindableproperties/bindablesubscription/bindablesubscription.cpp b/examples/corelib/bindableproperties/bindablesubscription/bindablesubscription.cpp
new file mode 100644
index 0000000000..32f4194635
--- /dev/null
+++ b/examples/corelib/bindableproperties/bindablesubscription/bindablesubscription.cpp
@@ -0,0 +1,51 @@
+// Copyright (C) 2021 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "bindablesubscription.h"
+#include "bindableuser.h"
+
+//! [binding-expressions]
+
+BindableSubscription::BindableSubscription(BindableUser *user) : m_user(user)
+{
+    Q_ASSERT(user);
+
+    m_price.setBinding(
+            [this] { return qRound(calculateDiscount() * int(m_duration) * basePrice()); });
+
+    m_isValid.setBinding([this] {
+        return m_user->country() != BindableUser::Country::AnyCountry && m_user->age() > 12;
+    });
+}
+
+//! [binding-expressions]
+
+//! [set-duration]
+
+void BindableSubscription::setDuration(Duration newDuration)
+{
+    m_duration = newDuration;
+}
+
+//! [set-duration]
+
+double BindableSubscription::calculateDiscount() const
+{
+    switch (m_duration) {
+    case Monthly:
+        return 1;
+    case Quarterly:
+        return 0.9;
+    case Yearly:
+        return 0.6;
+    }
+    Q_UNREACHABLE_RETURN(-1);
+}
+
+int BindableSubscription::basePrice() const
+{
+    if (m_user->country() == BindableUser::Country::AnyCountry)
+        return 0;
+
+    return (m_user->country() == BindableUser::Country::Norway) ? 100 : 80;
+}