1 files changed, 58 insertions, 0 deletions
diff --git a/libgo/go/exp/gui/gui.go b/libgo/go/exp/gui/gui.go
new file mode 100644
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+++ b/libgo/go/exp/gui/gui.go
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+// Copyright 2009 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package gui defines a basic graphical user interface programming model.
+package gui
+
+import (
+	"image"
+	"image/draw"
+	"os"
+)
+
+// A Window represents a single graphics window.
+type Window interface {
+	// Screen returns an editable Image for the window.
+	Screen() draw.Image
+	// FlushImage flushes changes made to Screen() back to screen.
+	FlushImage()
+	// EventChan returns a channel carrying UI events such as key presses,
+	// mouse movements and window resizes.
+	EventChan() <-chan interface{}
+	// Close closes the window.
+	Close() os.Error
+}
+
+// A KeyEvent is sent for a key press or release.
+type KeyEvent struct {
+	// The value k represents key k being pressed.
+	// The value -k represents key k being released.
+	// The specific set of key values is not specified,
+	// but ordinary characters represent themselves.
+	Key int
+}
+
+// A MouseEvent is sent for a button press or release or for a mouse movement.
+type MouseEvent struct {
+	// Buttons is a bit mask of buttons: 1<<0 is left, 1<<1 middle, 1<<2 right.
+	// It represents button state and not necessarily the state delta: bit 0
+	// being on means that the left mouse button is down, but does not imply
+	// that the same button was up in the previous MouseEvent.
+	Buttons int
+	// Loc is the location of the cursor.
+	Loc image.Point
+	// Nsec is the event's timestamp.
+	Nsec int64
+}
+
+// A ConfigEvent is sent each time the window's color model or size changes.
+// The client should respond by calling Window.Screen to obtain a new image.
+type ConfigEvent struct {
+	Config image.Config
+}
+
+// An ErrEvent is sent when an error occurs.
+type ErrEvent struct {
+	Err os.Error
+}