Decided to make dialogs code-modal; will figure out how to get the behavior I want on Mac OS X - http://stackoverflow.com/questions/24468620/how-do-i-create-a-nested-run-loop-after-nsalert-beginsheetmodalforwindow-tha - Now to see if Windows works...

dialog.go

@@ -2,12 +2,6 @@
 
 package ui
 
-// Dialog is an interface adopted by all dialogs.
-type Dialog struct {
-	Response() Response	// response code from the dialog
-	Selection() interface{}	// currently nil
-}
-
 // Response denotes a response from the user to a Dialog.
 type Response uint
 const (
@@ -15,14 +9,6 @@ const (
 	OK
 )
 
-// basic return
-type dialogret struct {
-	res	Response
-	sel	interface{}
-}
-func (d *dialogret) Response() Response { return d.res }
-func (d *dialogret) Selection() interface{} { return d.sel }	
-
 // sentinel (not nil so programmer errors don't go undetected)
 // this window is invalid and cannot be used directly
 // notice the support it uses
@@ -31,11 +17,6 @@ var dialogWindow = &Window{
 		winhandler:	dh,
 	}
 }
-type dhandler chan *dialogret
-func (d dhandler) Event(e Event, dat interface{}) {
-	d <- dat.(*dialogret)
-}
-var dh = make(dhandler)
 
 // MsgBox displays an informational message box to the user with just an OK button.
 // primaryText should be a short string describing the message, and will be displayed with additional emphasis on platforms that support it.
@@ -44,31 +25,32 @@ var dh = make(dhandler)
 // On platforms that allow for the message box window to have a title, os.Args[0] is used.
 //
 // See "On Dialogs" in the package overview for behavioral information.
-func MsgBox(primaryText string, secondaryText string) Response {
+func MsgBox(primaryText string, secondaryText string) {
 	dialogWindow.msgBox(primaryText, secondaryText)
-	return (<-dh).res
 }
 
 // MsgBox is the Window method version of the package-scope function MsgBox.
 // See that function's documentation and "On Dialogs" in the package overview for more information.
-func (w *Window) MsgBox(primaryText string, secondaryText string) Dialog {
+func (w *Window) MsgBox(primaryText string, secondaryText string) {
 	if !w.created {
 		panic("parent window passed to Window.MsgBox() before it was created")
 	}
-	return w.msgBox(primaryText, secondaryText)
+	w.msgBox(primaryText, secondaryText)
 }
 
 // MsgBoxError displays a message box to the user with just an OK button and an icon indicating an error.
 // Otherwise, it behaves like MsgBox.
 //
 // See "On Dialogs" in the package overview for more information.
-func MsgBoxError(primaryText string, secondaryText string) Dialog {
+func MsgBoxError(primaryText string, secondaryText string) {
 	dialogWindow.msgBoxError(primaryText, secondaryText)
-	return (<-dh).res
 }
 
 // MsgBoxError is the Window method version of the package-scope function MsgBoxError.
 // See that function's documentation and "On Dialogs" in the package overview for more information.
-func (w *Window) MsgBoxError(primaryText string, secondaryText string) Dialog {
-	return w.msgBoxError(primaryText, secondaryText)
+func (w *Window) MsgBoxError(primaryText string, secondaryText string) {
+	if !w.created {
+		panic("parent window passed to Window.MsgBox() before it was created")
+	}
+	w.msgBoxError(primaryText, secondaryText)
 }

dialog_windows.go

@@ -38,20 +38,13 @@ func _msgBox(parent *Window, primarytext string, secondarytext string, uType uin
 	if r1 == 0 { // failure
 		panic(fmt.Sprintf("error displaying message box to user: %v\nstyle: 0x%08X\ntitle: %q\ntext:\n%s", err, uType, os.Args[0], text))
 	}
-	w.sysData.winhandler.Event(Dismissed, &dialogret{
-		res:	dialogResponses[r1],
-	})
+	return dialogResponses[r1]
 }
 
 func (w *Window) msgBox(primarytext string, secondarytext string) {
-	// send to uitask so the function can return immediately
-	touitask(func() {
 	_msgBox(w, primarytext, secondarytext, _MB_OK)
-	})
 }
 
 func (w *Window) msgBoxError(primarytext string, secondarytext string) {
-	touitask(func() {
 	_msgBox(w, primarytext, secondarytext, _MB_OK|_MB_ICONERROR)
-	})
 }

test/main.go

@@ -559,14 +559,13 @@ func (handler *dialoghandler) Event(e Event, d Data) {
 	if e == Clicked {
 		switch d {
 		case handler.bMsgBox:
-//			dialog_sret = handler.w.MsgBox("Message Box", "Dismiss")
+//			handler.send(CustomEvent, "DIALOG")
+			handler.w.MsgBox("Message Box", "Dismiss")
 //			handler.send(CustomEvent, nil)
 		case handler.bMsgBoxError:
-//			dialog_sret = handler.w.MsgBoxError("Message Box", "Dismiss")
+//			handler.send(CustomEvent, "DIALOG")
+			handler.w.MsgBoxError("Message Box", "Dismiss")
 //			handler.send(CustomEvent, nil)
-//		case <-dialog_sret:
-//			dialog_sret = nil
-//			handler.send(CustomEvent + 1, nil)
 		case handler.bCenter:
 			handler.w.Center()
 		}

window.go

@@ -37,7 +37,6 @@ type Event int
 const (
 	Closing Event = iota			// Window close
 	Clicked					// Button click
-	Dismissed					// Dialog closed
 	CustomEvent = 5000		// very high number; higher than the package would ever need, anyway
 )