Feature/v2 linux menus (#1114)

* Render menubar + text menu items

* Support disabled menuitems + callbacks

* Support checkboxes

* Support reusing checkboxes

* Support submenus

* Support Radio menuitems

* Support Menu Accelerators

v2/internal/frontend/desktop/linux/gtk.go

@@ -0,0 +1,73 @@
+package linux
+
+/*
+#cgo linux pkg-config: gtk+-3.0 webkit2gtk-4.0
+
+#include "gtk/gtk.h"
+
+static GtkCheckMenuItem *toGtkCheckMenuItem(void *pointer) { return (GTK_CHECK_MENU_ITEM(pointer)); }
+
+extern void blockClick(GtkWidget* menuItem, gulong handler_id);
+extern void unblockClick(GtkWidget* menuItem, gulong handler_id);
+*/
+import "C"
+import "unsafe"
+import "github.com/wailsapp/wails/v2/pkg/menu"
+
+func GtkMenuItemWithLabel(label string) *C.GtkWidget {
+	cLabel := C.CString(label)
+	result := C.gtk_menu_item_new_with_label(cLabel)
+	C.free(unsafe.Pointer(cLabel))
+	return result
+}
+
+func GtkCheckMenuItemWithLabel(label string) *C.GtkWidget {
+	cLabel := C.CString(label)
+	result := C.gtk_check_menu_item_new_with_label(cLabel)
+	C.free(unsafe.Pointer(cLabel))
+	return result
+}
+
+func GtkRadioMenuItemWithLabel(label string, group *C.GSList) *C.GtkWidget {
+	cLabel := C.CString(label)
+	result := C.gtk_radio_menu_item_new_with_label(group, cLabel)
+	C.free(unsafe.Pointer(cLabel))
+	return result
+}
+
+//export handleMenuItemClick
+func handleMenuItemClick(gtkWidget unsafe.Pointer) {
+	item := gtkSignalToMenuItem[(*C.GtkWidget)(gtkWidget)]
+	switch item.Type {
+	case menu.CheckboxType:
+		item.Checked = !item.Checked
+		checked := C.int(0)
+		if item.Checked {
+			checked = C.int(1)
+		}
+		for _, gtkCheckbox := range gtkCheckboxCache[item] {
+			handler := gtkSignalHandlers[gtkCheckbox]
+			C.blockClick(gtkCheckbox, handler)
+			C.gtk_check_menu_item_set_active(C.toGtkCheckMenuItem(unsafe.Pointer(gtkCheckbox)), checked)
+			C.unblockClick(gtkCheckbox, handler)
+		}
+		item.Click(&menu.CallbackData{MenuItem: item})
+	case menu.RadioType:
+		gtkRadioItems := gtkRadioMenuCache[item]
+		active := C.gtk_check_menu_item_get_active(C.toGtkCheckMenuItem(gtkWidget))
+		if int(active) == 1 {
+			for _, gtkRadioItem := range gtkRadioItems {
+				handler := gtkSignalHandlers[gtkRadioItem]
+				C.blockClick(gtkRadioItem, handler)
+				C.gtk_check_menu_item_set_active(C.toGtkCheckMenuItem(unsafe.Pointer(gtkRadioItem)), 1)
+				C.unblockClick(gtkRadioItem, handler)
+			}
+			item.Checked = true
+			item.Click(&menu.CallbackData{MenuItem: item})
+		} else {
+			item.Checked = false
+		}
+	default:
+		item.Click(&menu.CallbackData{MenuItem: item})
+	}
+}

v2/internal/frontend/desktop/linux/keys.go

@@ -0,0 +1,103 @@
+package linux
+
+/*
+#cgo linux pkg-config: gtk+-3.0 webkit2gtk-4.0
+
+#include "gtk/gtk.h"
+
+*/
+import "C"
+import (
+	"github.com/wailsapp/wails/v2/pkg/menu/keys"
+)
+
+var namedKeysToGTK = map[string]C.guint{
+	"backspace": C.guint(0xff08),
+	"tab":       C.guint(0xff09),
+	"return":    C.guint(0xff0d),
+	"enter":     C.guint(0xff0d),
+	"escape":    C.guint(0xff1b),
+	"left":      C.guint(0xff51),
+	"right":     C.guint(0xff53),
+	"up":        C.guint(0xff52),
+	"down":      C.guint(0xff54),
+	"space":     C.guint(0xff80),
+	"delete":    C.guint(0xff9f),
+	"home":      C.guint(0xff95),
+	"end":       C.guint(0xff9c),
+	"page up":   C.guint(0xff9a),
+	"page down": C.guint(0xff9b),
+	"f1":        C.guint(0xffbe),
+	"f2":        C.guint(0xffbf),
+	"f3":        C.guint(0xffc0),
+	"f4":        C.guint(0xffc1),
+	"f5":        C.guint(0xffc2),
+	"f6":        C.guint(0xffc3),
+	"f7":        C.guint(0xffc4),
+	"f8":        C.guint(0xffc5),
+	"f9":        C.guint(0xffc6),
+	"f10":       C.guint(0xffc7),
+	"f11":       C.guint(0xffc8),
+	"f12":       C.guint(0xffc9),
+	"f13":       C.guint(0xffca),
+	"f14":       C.guint(0xffcb),
+	"f15":       C.guint(0xffcc),
+	"f16":       C.guint(0xffcd),
+	"f17":       C.guint(0xffce),
+	"f18":       C.guint(0xffcf),
+	"f19":       C.guint(0xffd0),
+	"f20":       C.guint(0xffd1),
+	"f21":       C.guint(0xffd2),
+	"f22":       C.guint(0xffd3),
+	"f23":       C.guint(0xffd4),
+	"f24":       C.guint(0xffd5),
+	"f25":       C.guint(0xffd6),
+	"f26":       C.guint(0xffd7),
+	"f27":       C.guint(0xffd8),
+	"f28":       C.guint(0xffd9),
+	"f29":       C.guint(0xffda),
+	"f30":       C.guint(0xffdb),
+	"f31":       C.guint(0xffdc),
+	"f32":       C.guint(0xffdd),
+	"f33":       C.guint(0xffde),
+	"f34":       C.guint(0xffdf),
+	"f35":       C.guint(0xffe0),
+	"numlock":   C.guint(0xff7f),
+}
+
+func acceleratorToGTK(accelerator *keys.Accelerator) (C.guint, C.GdkModifierType) {
+	key := parseKey(accelerator.Key)
+	mods := parseModifiers(accelerator.Modifiers)
+	return key, mods
+}
+
+func parseKey(key string) C.guint {
+	var result C.guint
+	result, found := namedKeysToGTK[key]
+	if found {
+		return result
+	}
+	// Check for unknown namedkeys
+	if len(key) > 1 {
+		return C.guint(0)
+	}
+	keyval := rune(key[0])
+	return C.gdk_unicode_to_keyval(C.guint(keyval))
+}
+
+func parseModifiers(modifiers []keys.Modifier) C.GdkModifierType {
+
+	var result C.GdkModifierType
+
+	for _, modifier := range modifiers {
+		switch modifier {
+		case keys.ShiftKey:
+			result |= C.GDK_SHIFT_MASK
+		case keys.ControlKey, keys.CmdOrCtrlKey:
+			result |= C.GDK_CONTROL_MASK
+		case keys.OptionOrAltKey:
+			result |= C.GDK_MOD1_MASK
+		}
+	}
+	return result
+}

v2/internal/frontend/desktop/linux/menu.go

@@ -3,12 +3,160 @@
 
 package linux
 
+/*
+#cgo linux pkg-config: gtk+-3.0 webkit2gtk-4.0
+
+#include "gtk/gtk.h"
+
+static GtkMenuItem *toGtkMenuItem(void *pointer) { return (GTK_MENU_ITEM(pointer)); }
+static GtkMenuShell *toGtkMenuShell(void *pointer) { return (GTK_MENU_SHELL(pointer)); }
+static GtkCheckMenuItem *toGtkCheckMenuItem(void *pointer) { return (GTK_CHECK_MENU_ITEM(pointer)); }
+static GtkRadioMenuItem *toGtkRadioMenuItem(void *pointer) { return (GTK_RADIO_MENU_ITEM(pointer)); }
+
+extern void handleMenuItemClick(void*);
+
+void blockClick(GtkWidget* menuItem, gulong handler_id) {
+	g_signal_handler_block (menuItem, handler_id);
+}
+
+void unblockClick(GtkWidget* menuItem, gulong handler_id) {
+	g_signal_handler_unblock (menuItem, handler_id);
+}
+
+gulong connectClick(GtkWidget* menuItem) {
+	return g_signal_connect(menuItem, "activate", G_CALLBACK(handleMenuItemClick), (void*)menuItem);
+}
+
+void addAccelerator(GtkWidget* menuItem, GtkAccelGroup* group, guint key, GdkModifierType mods) {
+	gtk_widget_add_accelerator(menuItem, "activate", group, key, mods, GTK_ACCEL_VISIBLE);
+}
+*/
+import "C"
 import "github.com/wailsapp/wails/v2/pkg/menu"
+import "unsafe"
+
+var menuIdCounter int
+var menuItemToId map[*menu.MenuItem]int
+var menuIdToItem map[int]*menu.MenuItem
+var gtkCheckboxCache map[*menu.MenuItem][]*C.GtkWidget
+var gtkMenuCache map[*menu.MenuItem]*C.GtkWidget
+var gtkRadioMenuCache map[*menu.MenuItem][]*C.GtkWidget
+var gtkSignalHandlers map[*C.GtkWidget]C.gulong
+var gtkSignalToMenuItem map[*C.GtkWidget]*menu.MenuItem
 
 func (f *Frontend) MenuSetApplicationMenu(menu *menu.Menu) {
-	panic("implement me")
+	f.mainWindow.SetApplicationMenu(menu)
 }
 
 func (f *Frontend) MenuUpdateApplicationMenu() {
-	panic("implement me")
+	//processMenu(f.mainWindow, f.mainWindow.applicationMenu)
+}
+
+func (w *Window) SetApplicationMenu(inmenu *menu.Menu) {
+	if inmenu == nil {
+		return
+	}
+
+	// Setup accelerator group
+	w.accels = C.gtk_accel_group_new()
+	C.gtk_window_add_accel_group(w.asGTKWindow(), w.accels)
+
+	menuItemToId = make(map[*menu.MenuItem]int)
+	menuIdToItem = make(map[int]*menu.MenuItem)
+	gtkCheckboxCache = make(map[*menu.MenuItem][]*C.GtkWidget)
+	gtkMenuCache = make(map[*menu.MenuItem]*C.GtkWidget)
+	gtkRadioMenuCache = make(map[*menu.MenuItem][]*C.GtkWidget)
+	gtkSignalHandlers = make(map[*C.GtkWidget]C.gulong)
+	gtkSignalToMenuItem = make(map[*C.GtkWidget]*menu.MenuItem)
+
+	// Increase ref count?
+	w.menubar = C.gtk_menu_bar_new()
+
+	processMenu(w, inmenu)
+
+	C.gtk_widget_show(w.menubar)
+}
+
+func processMenu(window *Window, menu *menu.Menu) {
+	for _, menuItem := range menu.Items {
+		submenu := processSubmenu(menuItem, window.accels)
+		C.gtk_menu_shell_append(C.toGtkMenuShell(unsafe.Pointer(window.menubar)), submenu)
+	}
+}
+
+func processSubmenu(menuItem *menu.MenuItem, group *C.GtkAccelGroup) *C.GtkWidget {
+	existingMenu := gtkMenuCache[menuItem]
+	if existingMenu != nil {
+		return existingMenu
+	}
+	gtkMenu := C.gtk_menu_new()
+	submenu := GtkMenuItemWithLabel(menuItem.Label)
+	for _, menuItem := range menuItem.SubMenu.Items {
+		menuID := menuIdCounter
+		menuIdToItem[menuID] = menuItem
+		menuItemToId[menuItem] = menuID
+		menuIdCounter++
+		processMenuItem(gtkMenu, menuItem, group)
+	}
+	C.gtk_menu_item_set_submenu(C.toGtkMenuItem(unsafe.Pointer(submenu)), gtkMenu)
+	gtkMenuCache[menuItem] = existingMenu
+	return submenu
+}
+
+var currentRadioGroup *C.GSList
+
+func processMenuItem(parent *C.GtkWidget, menuItem *menu.MenuItem, group *C.GtkAccelGroup) {
+	if menuItem.Hidden {
+		return
+	}
+
+	if menuItem.Type != menu.RadioType {
+		currentRadioGroup = nil
+	}
+
+	if menuItem.Type == menu.SeparatorType {
+		result := C.gtk_separator_menu_item_new()
+		C.gtk_menu_shell_append(C.toGtkMenuShell(unsafe.Pointer(parent)), result)
+		return
+	}
+
+	var result *C.GtkWidget
+
+	switch menuItem.Type {
+	case menu.TextType:
+		result = GtkMenuItemWithLabel(menuItem.Label)
+	case menu.CheckboxType:
+		result = GtkCheckMenuItemWithLabel(menuItem.Label)
+		if menuItem.Checked {
+			C.gtk_check_menu_item_set_active(C.toGtkCheckMenuItem(unsafe.Pointer(result)), 1)
+		}
+		gtkCheckboxCache[menuItem] = append(gtkCheckboxCache[menuItem], result)
+
+	case menu.RadioType:
+		result = GtkRadioMenuItemWithLabel(menuItem.Label, currentRadioGroup)
+		currentRadioGroup = C.gtk_radio_menu_item_get_group(C.toGtkRadioMenuItem(unsafe.Pointer(result)))
+		if menuItem.Checked {
+			C.gtk_check_menu_item_set_active(C.toGtkCheckMenuItem(unsafe.Pointer(result)), 1)
+		}
+		gtkRadioMenuCache[menuItem] = append(gtkRadioMenuCache[menuItem], result)
+	case menu.SubmenuType:
+		result = processSubmenu(menuItem, group)
+	}
+	C.gtk_menu_shell_append(C.toGtkMenuShell(unsafe.Pointer(parent)), result)
+	C.gtk_widget_show(result)
+
+	if menuItem.Click != nil {
+		handler := C.connectClick(result)
+		gtkSignalHandlers[result] = handler
+		gtkSignalToMenuItem[result] = menuItem
+	}
+
+	if menuItem.Disabled {
+		C.gtk_widget_set_sensitive(result, 0)
+	}
+
+	if menuItem.Accelerator != nil {
+		key, mods := acceleratorToGTK(menuItem.Accelerator)
+		C.addAccelerator(result, group, key, mods)
+	}
 }

v2/internal/frontend/desktop/linux/window.go

@@ -19,6 +19,14 @@ static GtkWindow* GTKWINDOW(void *pointer) {
 	return GTK_WINDOW(pointer);
 }
 
+static GtkContainer* GTKCONTAINER(void *pointer) {
+	return GTK_CONTAINER(pointer);
+}
+
+static GtkBox* GTKBOX(void *pointer) {
+	return GTK_BOX(pointer);
+}
+
 static void SetMinSize(GtkWindow* window, int width, int height) {
 	GdkGeometry size;
 	size.min_height = height;
@@ -153,7 +161,7 @@ gboolean close_button_pressed(GtkWidget *widget, GdkEvent *event, void* data)
 
 GtkWidget* setupWebview(void* contentManager, GtkWindow* window, int hideWindowOnClose) {
 	GtkWidget* webview = webkit_web_view_new_with_user_content_manager((WebKitUserContentManager*)contentManager);
-	gtk_container_add(GTK_CONTAINER(window), webview);
+	//gtk_container_add(GTK_CONTAINER(window), webview);
 	WebKitWebContext *context = webkit_web_context_get_default();
 	webkit_web_context_register_uri_scheme(context, "wails", (WebKitURISchemeRequestCallback)processURLRequest, NULL, NULL);
 	//g_signal_connect(G_OBJECT(webview), "load-changed", G_CALLBACK(webview_load_changed_cb), NULL);
@@ -376,6 +384,7 @@ GtkFileFilter* newFileFilter() {
 import "C"
 import (
 	"github.com/wailsapp/wails/v2/internal/frontend"
+	"github.com/wailsapp/wails/v2/pkg/menu"
 	"github.com/wailsapp/wails/v2/pkg/options"
 	"strings"
 	"unsafe"
@@ -394,6 +403,10 @@ type Window struct {
 	gtkWindow       unsafe.Pointer
 	contentManager  unsafe.Pointer
 	webview         unsafe.Pointer
+	applicationMenu *menu.Menu
+	menubar         *C.GtkWidget
+	vbox            *C.GtkWidget
+	accels          *C.GtkAccelGroup
 }
 
 func bool2Cint(value bool) C.int {
@@ -414,6 +427,9 @@ func NewWindow(appoptions *options.App, debug bool) *Window {
 	C.g_object_ref_sink(C.gpointer(gtkWindow))
 	result.gtkWindow = unsafe.Pointer(gtkWindow)
 
+	result.vbox = C.gtk_box_new(C.GTK_ORIENTATION_VERTICAL, 0)
+	C.gtk_container_add(result.asGTKContainer(), result.vbox)
+
 	result.contentManager = unsafe.Pointer(C.webkit_user_content_manager_new())
 	external := C.CString("external")
 	defer C.free(unsafe.Pointer(external))
@@ -428,7 +444,6 @@ func NewWindow(appoptions *options.App, debug bool) *Window {
 
 	if debug {
 		C.devtoolsEnabled(unsafe.Pointer(webview), C.int(1))
-
 	}
 
 	// Setup window
@@ -440,6 +455,9 @@ func NewWindow(appoptions *options.App, debug bool) *Window {
 	result.SetMinSize(appoptions.MinWidth, appoptions.MinHeight)
 	result.SetMaxSize(appoptions.MaxWidth, appoptions.MaxHeight)
 
+	// Menu
+	result.SetApplicationMenu(appoptions.Menu)
+
 	return result
 }
 
@@ -451,6 +469,10 @@ func (w *Window) asGTKWindow() *C.GtkWindow {
 	return C.GTKWINDOW(w.gtkWindow)
 }
 
+func (w *Window) asGTKContainer() *C.GtkContainer {
+	return C.GTKCONTAINER(w.gtkWindow)
+}
+
 func (w *Window) cWebKitUserContentManager() *C.WebKitUserContentManager {
 	return (*C.WebKitUserContentManager)(w.contentManager)
 }
@@ -549,6 +571,8 @@ func (w *Window) UpdateApplicationMenu() {
 }
 
 func (w *Window) Run() {
+	C.gtk_box_pack_start(C.GTKBOX(unsafe.Pointer(w.vbox)), w.menubar, 0, 0, 0)
+	C.gtk_box_pack_start(C.GTKBOX(unsafe.Pointer(w.vbox)), C.GTKWIDGET(w.webview), 1, 1, 0)
 	C.loadIndex(w.webview)
 	C.gtk_widget_show_all(w.asGTKWidget())
 	w.Center()