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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 draw
// A Context represents a single graphics window.
type Context interface {
// Screen returns an editable Image of window.
Screen() Image
// FlushImage flushes changes made to Screen() back to screen.
FlushImage()
// KeyboardChan returns a channel carrying keystrokes.
// An event is sent each time a key is pressed or released.
// 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 character represent themselves.
KeyboardChan() <-chan int
// MouseChan returns a channel carrying mouse events.
// A new event is sent each time the mouse moves or a
// button is pressed or released.
MouseChan() <-chan Mouse
// ResizeChan returns a channel carrying resize events.
// An event is sent each time the window is resized;
// the client should respond by calling Screen() to obtain
// the new screen image.
// The value sent on the channel is always ``true'' and can be ignored.
ResizeChan() <-chan bool
// QuitChan returns a channel carrying quit requests.
// After reading a value from the quit channel, the application
// should exit.
QuitChan() <-chan bool
}
// A Mouse represents the state of the mouse.
type Mouse struct {
Buttons int // bit mask of buttons: 1<<0 is left, 1<<1 middle, 1<<2 right
Point // location of cursor
Nsec int64 // time stamp
}
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