add about dialog

ui/controller/controller.go

@@ -22,6 +22,7 @@ type Controller struct {
 	// if not nil, this popup should be hidden when escape is pressed
 	EscapablePopUp *widget.PopUp
 
+	AppVersion string
 	MainWindow fyne.Window
 	App        *backend.App
 	NavHandler NavigationHandler
@@ -206,6 +207,14 @@ func (m *Controller) PromptForLoginAndConnect() {
 	pop.Show()
 }
 
+func (c *Controller) ShowAboutDialog() {
+	dlg := dialogs.NewAboutDialog(c.AppVersion)
+	pop := widget.NewModalPopUp(dlg, c.MainWindow.Canvas())
+	dlg.OnDismiss = pop.Hide
+	c.ClosePopUpOnEscape(pop)
+	pop.Show()
+}
+
 func (c *Controller) trySetPasswordAndConnectToServer(server *backend.ServerConfig, password string) error {
 	if err := c.App.ServerManager.SetServerPassword(server, password); err != nil {
 		log.Printf("error setting keyring credentials: %v", err)