Implement Qt.alpha()

Introduces an easy way to get a version of a color with transparency
(e.g. Qt.alpha("red", 0.5)).

[ChangeLog][QML][General] Added Qt.alpha for easily modifying a color's alpha value

Task-number: QTBUG-77635
Change-Id: Ic724e5fa503ca2ae5157a99eed1b5c913a39239f
Reviewed-by: Fabian Kosmale <[email protected]>
Reviewed-by: Shawn Rutledge <[email protected]>

1 files changed, 7 insertions, 0 deletions

diff --git a/src/quick/util/qquickglobal.cpp b/src/quick/util/qquickglobal.cpp
index 3ea2f88712..e8439121ca 100644
--- a/src/quick/util/qquickglobal.cpp
+++ b/src/quick/util/qquickglobal.cpp
@@ -123,6 +123,13 @@ public:
         return QVariant::fromValue(color);
     }
 
+    QVariant alpha(const QVariant &var, qreal value) override
+    {
+        QColor color = var.value<QColor>();
+        color.setAlphaF(value);
+        return QVariant::fromValue(color);
+    }
+
     QVariant tint(const QVariant &baseVar, const QVariant &tintVar) override
     {
         QColor tintColor = tintVar.value<QColor>();