migrate to eventbus, add support to macos

gui/gutil/window.go

@@ -0,0 +1,26 @@
+//go:build darwin || windows || linux
+
+package gutil
+
+import (
+	"fyne.io/fyne/v2"
+	"github.com/go-gl/glfw/v3.3/glfw"
+	"reflect"
+	"unsafe"
+)
+
+// getGlfwWindow returns the glfw.Window pointer from a fyne.Window.
+// very unsafe and ugly hacks. but it works.
+// todo: replace with LifeCycle https://github.com/fyne-io/fyne/issues/4483
+func getGlfwWindow(window fyne.Window) *glfw.Window {
+	rv := reflect.ValueOf(window)
+	if rv.Type().String() != "*glfw.window" {
+		return nil
+	}
+	rv = rv.Elem()
+	var glfwWindowPtr uintptr = rv.FieldByName("viewport").Pointer()
+	for glfwWindowPtr == 0 {
+		glfwWindowPtr = rv.FieldByName("viewport").Pointer()
+	}
+	return (*glfw.Window)(unsafe.Pointer(glfwWindowPtr))
+}

gui/gutil/window_darwin.go

@@ -0,0 +1,15 @@
+//go:build darwin
+
+package gutil
+
+import (
+	"fyne.io/fyne/v2"
+)
+
+func GetWindowHandle(window fyne.Window) uintptr {
+	glfwWindow := getGlfwWindow(window)
+	if glfwWindow == nil {
+		return 0
+	}
+	return uintptr(glfwWindow.GetCocoaWindow())
+}

gui/gutil/window_linux.go

@@ -0,0 +1,15 @@
+//go:build linux
+
+package gutil
+
+import (
+	"fyne.io/fyne/v2"
+)
+
+func GetWindowHandle(window fyne.Window) uintptr {
+	glfwWindow := getGlfwWindow(window)
+	if glfwWindow == nil {
+		return 0
+	}
+	return uintptr(glfwWindow.GetX11Window())
+}

gui/gutil/window_other.go

@@ -0,0 +1,9 @@
+//go:build !darwin && !windows && !linux
+
+package gutil
+
+import "fyne.io/fyne/v2"
+
+func GetWindowHandle(window fyne.Window) uintptr {
+	return 0
+}

gui/gutil/window_windows.go

@@ -0,0 +1,16 @@
+//go:build windows
+
+package gutil
+
+import (
+	"fyne.io/fyne/v2"
+	"unsafe"
+)
+
+func GetWindowHandle(window fyne.Window) uintptr {
+	glfwWindow := getGlfwWindow(window)
+	if glfwWindow == nil {
+		return 0
+	}
+	return uintptr(unsafe.Pointer(glfwWindow.GetWin32Window()))
+}