Added Window to the redo.

redo/window.go

@@ -0,0 +1,33 @@
+// 7 july 2014
+
+package ui
+
+// Window represents a top-level window on screen that contains other Controls.
+// Windows in package ui can only contain one control; the Stack and Grid layout Controls allow you to pack multiple Controls in a Window.
+// Note that a Window is not itself a Control.
+type Window interface {
+	// SetControl creates a Request to the Window's child Control.
+	SetControl(c Control) *Request
+
+	// Title and SetTitle create Requests to get and set the Window's title, respectively.
+	Title() *Request
+	SetTitle(title string) *Request
+
+	// Show and Hide create Requests to bring the Window on-screen and off-screen, respectively.
+	Show() *Request
+	Hide() *Request
+
+	// Close creates a Request to close the Window.
+	// Any Controls within the Window are destroyed, and the Window itself is also destroyed.
+	// Attempting to use a Window after it has been closed results in undefined behavior.
+	Close() *Request
+
+	// OnClosing registers an event handler that is triggered when the user clicks the Window's close button.
+	// On systems where whole applications own windows, OnClosing is also triggered when the user asks to close the application.
+	// If this handler returns true, the Window is closed as defined by Close above.
+	// If this handler returns false, the Window is not closed.
+	OnClosing(func(c Doer) bool)
+
+	// TODO SetSize (TODO remove?)
+	// TODO Center
+}