Toolbar and Menubar structure for types

[kkoreilly]

There are three options for how toolbars and menubars should be specified for types.

Option 1: Direct Code

func (me *Me) Menubar(tb *gi.Menubar) {
  file := gi.NewButton(tb).SetText("File").SetIcon(icons.File)
  file.Menu.NewButton(me.Save).SetIcon(icons.Save)
  file.Menu.NewButton(me.SaveAs).SetIcon(icons.Save)
  file.Menu.NewButton(me.Open).SetIcon(icons.OpenFile)
  export := file.Menu.NewButton().SetText("Export").SetIcon(icons.Share)
  export.Menu.NewButton(me.ExportPNG).SetText("PNG")
  export.Menu.NewButton(me.ExportJPG).SetText("JPG")
}

Option 2: Indirect Code

func (me *Me) Menubar() []*gi.Func {
  return []*gi.Func{
    {Label: "File", Icon: icons.File, Submenus: []*gi.Func{
       {Func: me.Save, Icon: icons.Save},
       {Func: me.SaveAs, Icon: icons.SaveAs},
       {Func: me.Open, Icon: icons.OpenFile},
       {Label: "Export", Icon: icons.Share, Submenus: []*gi.Func{
          {Func: me.ExportPNG, Label: "PNG"},
          {Func: me.ExportJPG, Label: "JPG"},
       },
    },
  }
}

Option 3: Comment Directives

//gi:menubar -parent File -icon save -parent-icon file
func (me *Me) Save...
//gi:menubar -parent File -icon save
func (me *Me) SaveAs...
//gi:menubar -parent File -icon open_file
func (me *Me) Open...
//gi:menubar -parent File/Export -parent-icon file/share -label PNG
func (me *Me) ExportPNG...
//gi:menubar -parent File/Export -label JPG
func (me *Me) ExportJPG...

[rcoreilly]

I think it is worth supporting options 1 and 3. 1 is the preferred way to do things for anything beyond a simple use-case, but there are likely lots of simple cases where just a little bit of this functionality is useful and it is easier to have it all auto-generated. it is also helpful for things that are not officially within the Gi scope, but you could end up inspecting them or editing them in some other way.

[kkoreilly]

We will only support option 1, as supporting an easy yet unsafe option will just lead to many of the problems listed in this discussion: #2 (comment)

[kkoreilly]

We are using option 1.