Implement as_ref for overloads in cxx-qt-lib

Closed: KDAB#810

crates/cxx-qt-lib/src/gui/qpainter.rs

@@ -3,6 +3,8 @@
 //
 // SPDX-License-Identifier: MIT OR Apache-2.0
 
+use core::pin::Pin;
+
 #[cxx::bridge]
 mod ffi {
     #[namespace = "Qt"]
@@ -344,7 +346,7 @@ mod ffi {
         fn setOpacity(self: Pin<&mut QPainter>, opacity: f64);
 
         /// Sets the painter's pen to be the given pen.
-        #[rust_name = "set_pen"]
+        #[rust_name = "set_pen_from_pen"]
         fn setPen(self: Pin<&mut QPainter>, pen: &QPen);
 
         /// Sets the given render hint on the painter if on is true; otherwise clears the render hint.
@@ -415,4 +417,8 @@ impl QPainter {
             None
         }
     }
+
+    pub fn set_pen(self: Pin<&mut ffi::QPainter>, pen: &impl AsRef<ffi::QPen>) {
+        self.set_pen_from_pen(pen.as_ref());
+    }
 }

crates/cxx-qt-lib/src/gui/qpen.rs

@@ -180,6 +180,19 @@ impl fmt::Display for QPen {
     }
 }
 
+impl AsRef<ffi::QPen> for ffi::QColor {
+    fn as_ref(&self) -> &ffi::QPen {
+        let pen = ffi::qpen_init_from_qcolor(&self);
+        pen
+    }
+}
+
+impl Into<QPen> for ffi::QColor {
+    fn into(self) -> QPen {
+        ffi::qpen_init_from_qcolor(&self)
+    }
+}
+
 // Safety:
 //
 // Static checks on the C++ side to ensure the size is the same.

examples/qml_features/rust/src/custom_parent_class.rs

@@ -84,6 +84,8 @@ impl qobject::CustomParentClass {
             // Now pinned painter can be used as normal
             // to render a rectangle with two colours
             let size = self.as_ref().size();
+            let color = self.as_ref().color();
+            pinned_painter.set_pen(color);
             pinned_painter.as_mut().fill_rect(
                 &QRectF::new(0.0, 0.0, size.width() / 2.0, size.height()),
                 self.as_ref().color(),