feat: PySide6 dev environment with runnable examplesHEADmain

Flake devShell (PySide6 6.11 on Python 3.13, designer, uic/rcc from
qtbase libexec, offline docs) plus hello_widgets and hello_quick
examples. QML_IMPORT_PATH exported — nixpkgs PySide6 finds platform
plugins on its own but not QML imports; see README.

3 files changed, 91 insertions, 0 deletions

diff --git a/examples/Main.qml b/examples/Main.qml
new file mode 100644
index 0000000..ed85a81
--- /dev/null
+++ b/examples/Main.qml
@@ -0,0 +1,26 @@
+import QtQuick
+import QtQuick.Controls
+
+ApplicationWindow {
+    visible: true
+    width: 320
+    height: 200
+    title: "Hello PySide6 Quick"
+
+    property int count: 0
+
+    Column {
+        anchors.centerIn: parent
+        spacing: 12
+
+        Text {
+            text: "Clics : " + count
+            anchors.horizontalCenter: parent.horizontalCenter
+        }
+
+        Button {
+            text: "Cliquer"
+            onClicked: count++
+        }
+    }
+}
diff --git a/examples/hello_quick.py b/examples/hello_quick.py
new file mode 100644
index 0000000..0ffa9f2
--- /dev/null
+++ b/examples/hello_quick.py
@@ -0,0 +1,22 @@
+#!/usr/bin/env python3
+"""Minimal PySide6 Qt Quick app: loads Main.qml next to this script."""
+
+import sys
+from pathlib import Path
+
+from PySide6.QtGui import QGuiApplication
+from PySide6.QtQml import QQmlApplicationEngine
+
+
+def main() -> int:
+    app = QGuiApplication(sys.argv)
+
+    engine = QQmlApplicationEngine()
+    engine.objectCreationFailed.connect(lambda: sys.exit(1))
+    engine.load(Path(__file__).parent / "Main.qml")
+
+    return app.exec()
+
+
+if __name__ == "__main__":
+    sys.exit(main())
diff --git a/examples/hello_widgets.py b/examples/hello_widgets.py
new file mode 100644
index 0000000..926fff6
--- /dev/null
+++ b/examples/hello_widgets.py
@@ -0,0 +1,43 @@
+#!/usr/bin/env python3
+"""Minimal PySide6 Widgets app: a counter demonstrating signals/slots."""
+
+import sys
+
+from PySide6.QtWidgets import (
+    QApplication,
+    QLabel,
+    QPushButton,
+    QVBoxLayout,
+    QWidget,
+)
+
+
+def main() -> int:
+    app = QApplication(sys.argv)
+
+    window = QWidget()
+    window.setWindowTitle("Hello PySide6")
+
+    label = QLabel("Clics : 0")
+    button = QPushButton("Cliquer")
+
+    count = 0
+
+    def on_click() -> None:
+        nonlocal count
+        count += 1
+        label.setText(f"Clics : {count}")
+
+    button.clicked.connect(on_click)
+
+    layout = QVBoxLayout(window)
+    layout.addWidget(label)
+    layout.addWidget(button)
+
+    window.resize(240, 100)
+    window.show()
+    return app.exec()
+
+
+if __name__ == "__main__":
+    sys.exit(main())