examples: add basic widgets example

Cargo.toml

@@ -16,6 +16,7 @@ members = [
     "examples/demo_threading/rust",
     "examples/qml_features/rust",
     "examples/qml_minimal/rust",
+    "examples/widgets_minimal",
 
     "tests/basic_cxx_only/rust",
     "tests/basic_cxx_qt/rust",

crates/cxx-qt-lib-extras/src/gui/qpushbutton.rs

@@ -42,6 +42,9 @@ mod ffi {
 }
 
 impl ffi::QPushButton {
+    // TODO: we need to think about how ownership in widgets is going to work
+    // as for items like QPushButton you may have a parent and have that
+    // free the object and not when the unique ptr goes out of scope
     pub fn new() -> cxx::UniquePtr<Self> {
         ffi::qpushbutton_init_default()
     }

examples/widgets_minimal/Cargo.toml

@@ -0,0 +1,26 @@
+# SPDX-FileCopyrightText: 2024 Klarälvdalens Datakonsult AB, a KDAB Group company <[email protected]>
+# SPDX-FileContributor: Andrew Hayzen <[email protected]>
+#
+# SPDX-License-Identifier: MIT OR Apache-2.0
+
+[package]
+name = "widgets-minimal-no-cmake"
+version = "0.1.0"
+authors = [
+  "Andrew Hayzen <[email protected]>",
+  "Be Wilson <[email protected]>",
+  "Gerhard de Clercq <[email protected]>",
+  "Leon Matthes <[email protected]>"
+]
+edition = "2021"
+license = "MIT OR Apache-2.0"
+
+[dependencies]
+cxx.workspace = true
+cxx-qt.workspace = true
+cxx-qt-lib.workspace = true
+cxx-qt-lib-extras.workspace = true
+
+[build-dependencies]
+# The link_qt_object_files feature is required for statically linking Qt 6.
+cxx-qt-build = { workspace = true, features = [ "link_qt_object_files" ] }

examples/widgets_minimal/build.rs

@@ -0,0 +1,13 @@
+// SPDX-FileCopyrightText: 2024 Klarälvdalens Datakonsult AB, a KDAB Group company <[email protected]>
+// SPDX-FileContributor: Andrew Hayzen <[email protected]>
+//
+// SPDX-License-Identifier: MIT OR Apache-2.0
+
+use cxx_qt_build::CxxQtBuilder;
+
+fn main() {
+    CxxQtBuilder::new()
+        // Link Qt's Network library
+        .qt_module("Network")
+        .build();
+}

examples/widgets_minimal/src/main.rs

@@ -0,0 +1,35 @@
+// SPDX-FileCopyrightText: 2024 Klarälvdalens Datakonsult AB, a KDAB Group company <[email protected]>
+// SPDX-FileContributor: Andrew Hayzen <[email protected]>
+//
+// SPDX-License-Identifier: MIT OR Apache-2.0
+
+//! This example provides demostrations of building a Qt Widgets CXX-Qt application
+
+use cxx_qt_lib::QString;
+use cxx_qt_lib_extras::{QApplication, QPushButton};
+
+fn main() {
+    let mut app = QApplication::new();
+
+    // TODO: we should really pass a parent in here
+    let mut push_button = QPushButton::new();
+
+    if let Some(mut push_button) = push_button.as_mut() {
+        push_button
+            .as_mut()
+            .set_text(&QString::from("Hello World!"));
+
+        push_button
+            .as_mut()
+            .on_clicked(|_, _| {
+                println!("Button Clicked!");
+            })
+            .release();
+
+        push_button.show();
+    }
+
+    if let Some(app) = app.as_mut() {
+        app.exec();
+    }
+}