Atomized the functionality of the base tomo package

input/input.go

@@ -0,0 +1,131 @@
+package input
+
+import "unicode"
+
+// Key represents a keyboard key.
+type Key int
+
+const (
+	KeyNone Key = 0
+	
+	KeyInsert      Key = 1
+	KeyMenu        Key = 2
+	KeyPrintScreen Key = 3
+	KeyPause       Key = 4
+	KeyCapsLock    Key = 5
+	KeyScrollLock  Key = 6
+	KeyNumLock     Key = 7
+	KeyBackspace   Key = 8
+	KeyTab         Key = 9
+	KeyEnter       Key = 10
+	KeyEscape      Key = 11
+	
+	KeyUp       Key = 12
+	KeyDown     Key = 13
+	KeyLeft     Key = 14
+	KeyRight    Key = 15
+	KeyPageUp   Key = 16
+	KeyPageDown Key = 17
+	KeyHome     Key = 18
+	KeyEnd      Key = 19
+	
+	KeyLeftShift    Key = 20
+	KeyRightShift   Key = 21
+	KeyLeftControl  Key = 22
+	KeyRightControl Key = 23
+	KeyLeftAlt      Key = 24
+	KeyRightAlt     Key = 25
+	KeyLeftMeta     Key = 26
+	KeyRightMeta    Key = 27	
+	KeyLeftSuper    Key = 28
+	KeyRightSuper   Key = 29
+	KeyLeftHyper    Key = 30
+	KeyRightHyper   Key = 31
+	
+	KeyDelete Key = 127
+	
+	KeyDead Key = 128
+	
+	KeyF1  Key = 129
+	KeyF2  Key = 130
+	KeyF3  Key = 131
+	KeyF4  Key = 132
+	KeyF5  Key = 133
+	KeyF6  Key = 134
+	KeyF7  Key = 135
+	KeyF8  Key = 136
+	KeyF9  Key = 137
+	KeyF10 Key = 138
+	KeyF11 Key = 139
+	KeyF12 Key = 140
+)
+
+// Button represents a mouse button.
+type Button int
+
+const (
+	ButtonNone Button = iota
+	
+	Button1
+	Button2
+	Button3
+	Button4
+	Button5
+	Button6
+	Button7
+	Button8
+	Button9
+	
+	ButtonLeft    Button = Button1
+	ButtonMiddle  Button = Button2
+	ButtonRight   Button = Button3
+	ButtonBack    Button = Button8
+	ButtonForward Button = Button9
+)
+
+// Printable returns whether or not the key's character could show up on screen.
+// If this function returns true, the key can be cast to a rune and used as
+// such.
+func (key Key) Printable () (printable bool) {
+	printable = unicode.IsPrint(rune(key))
+	return
+}
+
+// Modifiers lists what modifier keys are being pressed. This is used in
+// conjunction with a Key code in a Key press event. These should be used
+// instead of attempting to track the state of the modifier keys, because there
+// is no guarantee that one press event will be coupled with one release event.
+type Modifiers struct {
+	Shift   bool
+	Control bool
+	Alt     bool
+	Meta    bool
+	Super   bool
+	Hyper   bool
+
+	// NumberPad does not represent a key, but it behaves like one. If it is
+	// set to true, the Key was pressed on the number pad. It is treated
+	// as a modifier key because if you don't care whether a key was pressed
+	// on the number pad or not, you can just ignore this value.
+	NumberPad bool
+}
+
+// KeynavDirection represents a keyboard navigation direction.
+type KeynavDirection int
+
+const (
+	KeynavDirectionNeutral  KeynavDirection =  0
+	KeynavDirectionBackward KeynavDirection = -1
+	KeynavDirectionForward  KeynavDirection =  1
+)
+
+// Canon returns a well-formed direction.
+func (direction KeynavDirection) Canon () (canon KeynavDirection) {
+	if direction > 0 {
+		return KeynavDirectionForward
+	} else if direction == 0 {
+		return KeynavDirectionNeutral
+	} else {
+		return KeynavDirectionBackward
+	}
+}