Return error from NewWindow

backend.go

@@ -5,7 +5,7 @@ import "image"
 import "errors"
 
 type Backend interface {
-	NewWindow       (image.Rectangle) MainWindow
+	NewWindow       (image.Rectangle) (MainWindow, error)
 	NewBox          () Box
 	NewTextBox      () TextBox
 	NewCanvasBox    () CanvasBox

canvas/canvas.go

@@ -1,3 +1,5 @@
+// Canvas defines a standard interface for images that support drawing
+// primitives.
 package canvas
 
 import "image"
@@ -30,8 +32,11 @@ type StrokeAlign int; const (
 // have multiple pens associated with it, each maintaining their own drawing
 // context.
 type Pen interface {
-	// Draw draws a path
-	Draw (points ...image.Point)
+	// Rectangle draws a rectangle
+	Rectangle (image.Rectangle)
+
+	// Path draws a path
+	Path (points ...image.Point)
 
 	Closed       (bool)        // if the path is closed
 	Cap          (Cap)         // line cap stype

event/event.go

@@ -1,3 +1,5 @@
+// Package event provides a system for broadcasting events to multiple event
+// handlers.
 package event
 
 // A cookie is returned when you add an event handler so you can remove it

object.go

@@ -93,15 +93,16 @@ type ContainerBox interface {
 
 type Window interface {
 	SetRoot  (Object)
+	SetTitle (string)
 	SetIcon  (sizes []image.Image)
 	NewMenu  (image.Rectangle) (Window, error)
 	NewModal (image.Rectangle) (Window, error)
 	Widget   () (Window, error)
 	Copy     (data.Data)
 	Paste    (callback func (data.Data, error), accept ...data.Mime)
-	Close    ()
 	Show     ()
 	Hide     ()
+	Close    ()
 	OnClose  (func ()) event.Cookie
 }
 

tomo.go

@@ -9,6 +9,8 @@ var backend Backend
 // event loop in that order. This function blocks until Stop is called, or the
 // backend experiences a fatal error.
 func Run (callback func ()) error {
+	loadPlugins()
+
 	if backend != nil {
 		return errors.New("there is already a backend running")
 	}
@@ -33,7 +35,7 @@ func Stop () {
 	backend = nil
 }
 
-func NewWindow (bounds image.Rectangle) MainWindow {
+func NewWindow (bounds image.Rectangle) (MainWindow, error) {
 	assertBackend()
 	return backend.NewWindow(bounds)
 }