From fea87aff427b6f683936277a51a8612aa31001f3 Mon Sep 17 00:00:00 2001
From: mappu <mappu04@gmail.com>
Date: Mon, 23 Oct 2023 11:00:00 +1300
Subject: [PATCH] initial commit

---
 binding.cpp | 28 ++++++++++++++++++++
 binding.go  | 74 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 binding.h   | 25 ++++++++++++++++++
 go.mod      |  3 +++
 main.go     | 26 +++++++++++++++++++
 5 files changed, 156 insertions(+)
 create mode 100644 binding.cpp
 create mode 100644 binding.go
 create mode 100644 binding.h
 create mode 100644 go.mod
 create mode 100644 main.go

diff --git a/binding.cpp b/binding.cpp
new file mode 100644
index 00000000..b64a8e73
--- /dev/null
+++ b/binding.cpp
@@ -0,0 +1,28 @@
+#include "binding.h"
+#include <QApplication>
+#include <QWidget>
+#include <QPushButton>
+
+PQApplication QApplication_new(int argc, char** argv) {
+    return new QApplication(argc, argv);
+}
+
+PQWidget QWidget_new() {
+    return new QWidget();
+}
+
+void QWidget_show(PQWidget self) {
+    static_cast<QWidget*>(self)->show();    
+}
+
+PQPushButton QPushButton_new(const char* label, PQWidget parent) {
+    return new QPushButton(label, static_cast<QWidget*>(parent));
+}
+
+void QPushButton_show(PQPushButton self) {
+    static_cast<QPushButton*>(self)->show();
+}
+
+int QApplication_exec(PQApplication self) {
+    return static_cast<QApplication*>(self)->exec();
+}
diff --git a/binding.go b/binding.go
new file mode 100644
index 00000000..2e016b93
--- /dev/null
+++ b/binding.go
@@ -0,0 +1,74 @@
+package main
+
+/*
+
+#cgo pkg-config: Qt5Widgets
+#include "binding.h"
+
+*/
+import "C"
+
+import (
+	"unsafe"
+)
+
+func CArray(data []string) (C.int, **C.char) {
+
+	c_argv := (*[0xfff]*C.char)(C.malloc(C.ulong(8 /* sizeof pointer */ * len(data))))
+
+	for i, arg := range data {
+		c_argv[i] = C.CString(arg)
+	}
+
+	return C.int(len(data)), (**C.char)(unsafe.Pointer(c_argv))
+}
+
+//
+
+type QApplication struct {
+	h C.PQApplication
+}
+
+func NewQApplication(args []string) *QApplication {
+	h := C.QApplication_new(CArray(args))
+	return &QApplication{h: h}
+}
+
+func (this *QApplication) Exec() int {
+	ret := C.QApplication_exec(this.h)
+	return int(ret)
+}
+
+//
+
+type QWidget struct {
+	h C.PQWidget
+}
+
+func NewQWidget() *QWidget {
+	ret := C.QWidget_new()
+	return &QWidget{h: ret}
+}
+
+func (this *QWidget) Show() {
+	C.QWidget_show(this.h)
+}
+
+//
+
+type QPushButton struct {
+	h C.PQPushButton
+}
+
+func NewQPushButton(label string, parent QWidget) *QPushButton {
+	h := C.QPushButton_new(C.CString(label), parent.h)
+	return &QPushButton{h: h}
+}
+
+func (this *QPushButton) Show() {
+	C.QPushButton_show(this.h)
+}
+
+func (this *QPushButton) AsQWidget() *QWidget {
+	return &QWidget{h: C.PQWidget(this.h)} // Type cast
+}
diff --git a/binding.h b/binding.h
new file mode 100644
index 00000000..a4cfd476
--- /dev/null
+++ b/binding.h
@@ -0,0 +1,25 @@
+typedef void* PQApplication;
+
+typedef void* PQPushButton;
+
+typedef void* PQWidget;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+PQApplication QApplication_new(int argc, char** argv);
+
+PQWidget QWidget_new();
+
+void QWidget_show(PQWidget self);
+
+PQPushButton QPushButton_new(const char* label, PQWidget parent);
+
+void QPushButton_show(PQPushButton self);
+
+int QApplication_exec(PQApplication self);
+
+#ifdef __cplusplus
+} /* extern C */
+#endif 
diff --git a/go.mod b/go.mod
new file mode 100644
index 00000000..1f63e962
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module qtbindingexperiment
+
+go 1.19
diff --git a/main.go b/main.go
new file mode 100644
index 00000000..bcb4889e
--- /dev/null
+++ b/main.go
@@ -0,0 +1,26 @@
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+func main() {
+
+	app := NewQApplication(os.Args)
+
+	/*
+		btn := NewQPushButton("Hello world!", QWidget{})
+		fmt.Printf("%#v\n", btn)
+
+		btn.Show()
+	*/
+
+	wid := NewQWidget()
+	_ = wid
+	wid.Show()
+
+	app.Exec()
+
+	fmt.Println("OK!")
+}