add missing resize for framless window on linux (#1918)

Co-authored-by: Lea Anthony <lea.anthony@gmail.com>

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

@@ -21,6 +21,7 @@ import (
 	"os"
 	"runtime"
 	"strconv"
+	"strings"
 	"text/template"
 	"unsafe"
 
@@ -183,10 +184,16 @@ func (f *Frontend) WindowSetTitle(title string) {
 }
 
 func (f *Frontend) WindowFullscreen() {
+	if f.frontendOptions.Frameless && f.frontendOptions.DisableResize == false {
+		f.ExecJS("window.wails.flags.enableResize = false;")
+	}
 	f.mainWindow.Fullscreen()
 }
 
 func (f *Frontend) WindowUnfullscreen() {
+	if f.frontendOptions.Frameless && f.frontendOptions.DisableResize == false {
+		f.ExecJS("window.wails.flags.enableResize = true;")
+	}
 	f.mainWindow.UnFullscreen()
 }
 
@@ -289,6 +296,17 @@ func (f *Frontend) Notify(name string, data ...interface{}) {
 	f.mainWindow.ExecJS(`window.wails.EventsNotify('` + template.JSEscapeString(string(payload)) + `');`)
 }
 
+var edgeMap = map[string]uintptr{
+	"n-resize":  C.GDK_WINDOW_EDGE_NORTH,
+	"ne-resize": C.GDK_WINDOW_EDGE_NORTH_EAST,
+	"e-resize":  C.GDK_WINDOW_EDGE_EAST,
+	"se-resize": C.GDK_WINDOW_EDGE_SOUTH_EAST,
+	"s-resize":  C.GDK_WINDOW_EDGE_SOUTH,
+	"sw-resize": C.GDK_WINDOW_EDGE_SOUTH_WEST,
+	"w-resize":  C.GDK_WINDOW_EDGE_WEST,
+	"nw-resize": C.GDK_WINDOW_EDGE_NORTH_WEST,
+}
+
 func (f *Frontend) processMessage(message string) {
 	if message == "DomReady" {
 		if f.frontendOptions.OnDomReady != nil {
@@ -304,9 +322,29 @@ func (f *Frontend) processMessage(message string) {
 		return
 	}
 
+	if strings.HasPrefix(message, "resize:") {
+		if !f.mainWindow.IsFullScreen() {
+			sl := strings.Split(message, ":")
+			if len(sl) != 2 {
+				f.logger.Info("Unknown message returned from dispatcher: %+v", message)
+				return
+			}
+			edge := edgeMap[sl[1]]
+			err := f.startResize(edge)
+			if err != nil {
+				f.logger.Error(err.Error())
+			}
+		}
+		return
+	}
+
 	if message == "runtime:ready" {
 		cmd := fmt.Sprintf("window.wails.setCSSDragProperties('%s', '%s');", f.frontendOptions.CSSDragProperty, f.frontendOptions.CSSDragValue)
 		f.ExecJS(cmd)
+
+		if f.frontendOptions.Frameless && f.frontendOptions.DisableResize == false {
+			f.ExecJS("window.wails.flags.enableResize = true;")
+		}
 		return
 	}
 
@@ -339,6 +377,11 @@ func (f *Frontend) startDrag() {
 	f.mainWindow.StartDrag()
 }
 
+func (f *Frontend) startResize(edge uintptr) error {
+	f.mainWindow.StartResize(edge)
+	return nil
+}
+
 func (f *Frontend) ExecJS(js string) {
 	f.mainWindow.ExecJS(js)
 }

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

@@ -159,11 +159,12 @@ ulong setupInvokeSignal(void* contentManager) {
 	return g_signal_connect((WebKitUserContentManager*)contentManager, "script-message-received::external", G_CALLBACK(sendMessageToBackend), NULL);
 }
 
-// These are the x,y & time of the last mouse down event
+// These are the x,y,time & button of the last mouse down event
 // It's used for window dragging
 float xroot = 0.0f;
 float yroot = 0.0f;
 int dragTime = -1;
+uint mouseButton = 0;
 bool contextMenuDisabled = false;
 
 gboolean buttonPress(GtkWidget *widget, GdkEventButton *event, void* dummy)
@@ -173,7 +174,7 @@ gboolean buttonPress(GtkWidget *widget, GdkEventButton *event, void* dummy)
 		dragTime = -1;
 		return FALSE;
 	}
-
+	mouseButton = event->button;
 	if( event->button == 3 && contextMenuDisabled ) {
 		return TRUE;
 	}
@@ -256,7 +257,7 @@ static gboolean startDrag(gpointer data) {
 		return G_SOURCE_REMOVE;
 	}
 
-	gtk_window_begin_move_drag(options->mainwindow, 1, xroot, yroot, dragTime);
+	gtk_window_begin_move_drag(options->mainwindow, mouseButton, xroot, yroot, dragTime);
 	free(data);
 
 	return G_SOURCE_REMOVE;
@@ -269,6 +270,36 @@ static void StartDrag(void *webview, GtkWindow* mainwindow) {
 	ExecuteOnMainThread(startDrag, (gpointer)data);
 }
 
+typedef struct ResizeOptions {
+	void *webview;
+	GtkWindow* mainwindow;
+	GdkWindowEdge edge;
+} ResizeOptions;
+
+static gboolean startResize(gpointer data) {
+	ResizeOptions* options = (ResizeOptions*)data;
+
+	// Ignore non-toplevel widgets
+	GtkWidget *window = gtk_widget_get_toplevel(GTK_WIDGET(options->webview));
+	if (!GTK_IS_WINDOW(window)) {
+		free(data);
+		return G_SOURCE_REMOVE;
+	}
+
+	gtk_window_begin_resize_drag(options->mainwindow, options->edge, 1, xroot, yroot, dragTime);
+	free(data);
+
+	return G_SOURCE_REMOVE;
+}
+
+static void StartResize(void *webview, GtkWindow* mainwindow, GdkWindowEdge edge) {
+	ResizeOptions* data = malloc(sizeof(ResizeOptions));
+	data->webview = webview;
+	data->mainwindow = mainwindow;
+	data->edge = edge;
+	ExecuteOnMainThread(startResize, (gpointer)data);
+}
+
 typedef struct JSCallback {
     void* webview;
     char* script;
@@ -895,6 +926,10 @@ func (w *Window) StartDrag() {
 	C.StartDrag(w.webview, w.asGTKWindow())
 }
 
+func (w *Window) StartResize(edge uintptr) {
+	C.StartResize(w.webview, w.asGTKWindow(), C.GdkWindowEdge(edge))
+}
+
 func (w *Window) Quit() {
 	C.gtk_main_quit()
 }