Removed ui.Event(); all event channels are initialized with their objects now.

button.go

@@ -7,8 +7,8 @@ import (
 
 // A Button represents a clickable button with some text.
 type Button struct {
-	// This channel gets a message when the button is clicked.
-	// Unlike other channels in this package, this channel is initialized to non-nil when creating a new button, and cannot be set to nil later.
+	// Clicked gets a message when the button is clicked.
+	// You cannot change it once the Window containing the Button has been opened.
 	Clicked	chan struct{}
 
 	lock		sync.Mutex
@@ -22,7 +22,7 @@ func NewButton(text string) (b *Button) {
 	return &Button{
 		sysData:	mksysdata(c_button),
 		initText:	text,
-		Clicked:	Event(),
+		Clicked:	newEvent(),
 	}
 }
 

doc.go

@@ -9,8 +9,6 @@ Building GUIs is as simple as creating a Window, populating it with Controls, an
 
 Once a Window is open, you cannot make layout changes.
 
-At present, you must also hook Window.Closing with ui.Event() to monitor for attempts to close the Window.
-
 Once your Window is open, you can begin to handle events. Handling events is simple: because all events are channels exposed as exported members of the Window and Control types, simply select on them.
 
 Here is a simple, complete program that asks the user for their name and greets them after clicking a button.
@@ -22,7 +20,6 @@ Here is a simple, complete program that asks the user for their name and greets
 
 	func myMain() {
 		w := ui.NewWindow("Hello", 400, 100)
-		w.Closing = ui.Event()
 		nameField := ui.NewLineEdit("Enter Your Name Here")
 		button := ui.NewButton("Click Here For a Greeting")
 		err := w.Open(ui.NewVerticalStack(nameField, button))

sysdata.go

@@ -7,8 +7,8 @@ import (
 
 const eventbufsiz = 100		// suggested by skelterjohn
 
-// Event returns a new channel suitable for listening for events.
-func Event() chan struct{} {
+// newEvent returns a new channel suitable for listening for events.
+func newEvent() chan struct{} {
 	return make(chan struct{}, eventbufsiz)
 }
 

test/main.go

@@ -112,7 +112,6 @@ var invalidBefore = flag.Bool("invalid", false, "run invalid test before opening
 
 func myMain() {
 	w := NewWindow("Main Window", 320, 240)
-	w.Closing = Event()
 	b := NewButton("Click Me")
 	b2 := NewButton("Or Me")
 	s2 := NewHorizontalStack(b, b2)

todo.md

@@ -86,4 +86,3 @@ maybe:
 - rename Stack to Box?
 - make Combobox and Listbox satisfy sort.Interface?
 - should a noneditable Combobox be allowed to return to unselected mode by the user?
-- since all events are dispatched without blocking uitask, don't bother requiring explicit dispatch? remove ui.Event() and make Window.Closing initialized by default; if we don't listen on the channel, nothing will happen

window.go

@@ -8,8 +8,8 @@ import (
 
 // Window represents an on-screen window.
 type Window struct {
-	// If this channel is non-nil, the event loop will receive on this when the user clicks the window's close button.
-	// This channel can only be set before initially opening the window.
+	// Closing gets a message when the user clicks the window's close button.
+	// You cannot change it once the Window has been opened.
 	Closing		chan struct{}
 
 	lock			sync.Mutex
@@ -27,6 +27,7 @@ func NewWindow(title string, width int, height int) *Window {
 		initTitle:		title,
 		initWidth:		width,
 		initHeight:	height,
+		Closing:		newEvent(),
 	}
 }