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mouse.go
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mouse.go
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package tea
import "strconv"
// MouseMsg contains information about a mouse event and are sent to a programs
// update function when mouse activity occurs. Note that the mouse must first
// be enabled in order for the mouse events to be received.
type MouseMsg MouseEvent
// String returns a string representation of a mouse event.
func (m MouseMsg) String() string {
return MouseEvent(m).String()
}
// MouseEvent represents a mouse event, which could be a click, a scroll wheel
// movement, a cursor movement, or a combination.
type MouseEvent struct {
X int
Y int
Shift bool
Alt bool
Ctrl bool
Action MouseAction
Button MouseButton
// Deprecated: Use MouseAction & MouseButton instead.
Type MouseEventType
}
// IsWheel returns true if the mouse event is a wheel event.
func (m MouseEvent) IsWheel() bool {
return m.Button == MouseButtonWheelUp || m.Button == MouseButtonWheelDown ||
m.Button == MouseButtonWheelLeft || m.Button == MouseButtonWheelRight
}
// String returns a string representation of a mouse event.
func (m MouseEvent) String() (s string) {
if m.Ctrl {
s += "ctrl+"
}
if m.Alt {
s += "alt+"
}
if m.Shift {
s += "shift+"
}
if m.Button == MouseButtonNone { //nolint:nestif
if m.Action == MouseActionMotion || m.Action == MouseActionRelease {
s += mouseActions[m.Action]
} else {
s += "unknown"
}
} else if m.IsWheel() {
s += mouseButtons[m.Button]
} else {
btn := mouseButtons[m.Button]
if btn != "" {
s += btn
}
act := mouseActions[m.Action]
if act != "" {
s += " " + act
}
}
return s
}
// MouseAction represents the action that occurred during a mouse event.
type MouseAction int
// Mouse event actions.
const (
MouseActionPress MouseAction = iota
MouseActionRelease
MouseActionMotion
)
var mouseActions = map[MouseAction]string{
MouseActionPress: "press",
MouseActionRelease: "release",
MouseActionMotion: "motion",
}
// MouseButton represents the button that was pressed during a mouse event.
type MouseButton int
// Mouse event buttons
//
// This is based on X11 mouse button codes.
//
// 1 = left button
// 2 = middle button (pressing the scroll wheel)
// 3 = right button
// 4 = turn scroll wheel up
// 5 = turn scroll wheel down
// 6 = push scroll wheel left
// 7 = push scroll wheel right
// 8 = 4th button (aka browser backward button)
// 9 = 5th button (aka browser forward button)
// 10
// 11
//
// Other buttons are not supported.
const (
MouseButtonNone MouseButton = iota
MouseButtonLeft
MouseButtonMiddle
MouseButtonRight
MouseButtonWheelUp
MouseButtonWheelDown
MouseButtonWheelLeft
MouseButtonWheelRight
MouseButtonBackward
MouseButtonForward
MouseButton10
MouseButton11
)
var mouseButtons = map[MouseButton]string{
MouseButtonNone: "none",
MouseButtonLeft: "left",
MouseButtonMiddle: "middle",
MouseButtonRight: "right",
MouseButtonWheelUp: "wheel up",
MouseButtonWheelDown: "wheel down",
MouseButtonWheelLeft: "wheel left",
MouseButtonWheelRight: "wheel right",
MouseButtonBackward: "backward",
MouseButtonForward: "forward",
MouseButton10: "button 10",
MouseButton11: "button 11",
}
// MouseEventType indicates the type of mouse event occurring.
//
// Deprecated: Use MouseAction & MouseButton instead.
type MouseEventType int
// Mouse event types.
//
// Deprecated: Use MouseAction & MouseButton instead.
const (
MouseUnknown MouseEventType = iota
MouseLeft
MouseRight
MouseMiddle
MouseRelease // mouse button release (X10 only)
MouseWheelUp
MouseWheelDown
MouseWheelLeft
MouseWheelRight
MouseBackward
MouseForward
MouseMotion
)
// Parse SGR-encoded mouse events; SGR extended mouse events. SGR mouse events
// look like:
//
// ESC [ < Cb ; Cx ; Cy (M or m)
//
// where:
//
// Cb is the encoded button code
// Cx is the x-coordinate of the mouse
// Cy is the y-coordinate of the mouse
// M is for button press, m is for button release
//
// https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h3-Extended-coordinates
func parseSGRMouseEvent(buf []byte) MouseEvent {
str := string(buf[3:])
matches := mouseSGRRegex.FindStringSubmatch(str)
if len(matches) != 5 { //nolint:gomnd
// Unreachable, we already checked the regex in `detectOneMsg`.
panic("invalid mouse event")
}
b, _ := strconv.Atoi(matches[1])
px := matches[2]
py := matches[3]
release := matches[4] == "m"
m := parseMouseButton(b, true)
// Wheel buttons don't have release events
// Motion can be reported as a release event in some terminals (Windows Terminal)
if m.Action != MouseActionMotion && !m.IsWheel() && release {
m.Action = MouseActionRelease
m.Type = MouseRelease
}
x, _ := strconv.Atoi(px)
y, _ := strconv.Atoi(py)
// (1,1) is the upper left. We subtract 1 to normalize it to (0,0).
m.X = x - 1
m.Y = y - 1
return m
}
const x10MouseByteOffset = 32
// Parse X10-encoded mouse events; the simplest kind. The last release of X10
// was December 1986, by the way. The original X10 mouse protocol limits the Cx
// and Cy coordinates to 223 (=255-032).
//
// X10 mouse events look like:
//
// ESC [M Cb Cx Cy
//
// See: http://www.xfree86.org/current/ctlseqs.html#Mouse%20Tracking
func parseX10MouseEvent(buf []byte) MouseEvent {
v := buf[3:6]
m := parseMouseButton(int(v[0]), false)
// (1,1) is the upper left. We subtract 1 to normalize it to (0,0).
m.X = int(v[1]) - x10MouseByteOffset - 1
m.Y = int(v[2]) - x10MouseByteOffset - 1
return m
}
// See: https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h3-Extended-coordinates
func parseMouseButton(b int, isSGR bool) MouseEvent {
var m MouseEvent
e := b
if !isSGR {
e -= x10MouseByteOffset
}
const (
bitShift = 0b0000_0100
bitAlt = 0b0000_1000
bitCtrl = 0b0001_0000
bitMotion = 0b0010_0000
bitWheel = 0b0100_0000
bitAdd = 0b1000_0000 // additional buttons 8-11
bitsMask = 0b0000_0011
)
if e&bitAdd != 0 {
m.Button = MouseButtonBackward + MouseButton(e&bitsMask)
} else if e&bitWheel != 0 {
m.Button = MouseButtonWheelUp + MouseButton(e&bitsMask)
} else {
m.Button = MouseButtonLeft + MouseButton(e&bitsMask)
// X10 reports a button release as 0b0000_0011 (3)
if e&bitsMask == bitsMask {
m.Action = MouseActionRelease
m.Button = MouseButtonNone
}
}
// Motion bit doesn't get reported for wheel events.
if e&bitMotion != 0 && !m.IsWheel() {
m.Action = MouseActionMotion
}
// Modifiers
m.Alt = e&bitAlt != 0
m.Ctrl = e&bitCtrl != 0
m.Shift = e&bitShift != 0
// backward compatibility
switch {
case m.Button == MouseButtonLeft && m.Action == MouseActionPress:
m.Type = MouseLeft
case m.Button == MouseButtonMiddle && m.Action == MouseActionPress:
m.Type = MouseMiddle
case m.Button == MouseButtonRight && m.Action == MouseActionPress:
m.Type = MouseRight
case m.Button == MouseButtonNone && m.Action == MouseActionRelease:
m.Type = MouseRelease
case m.Button == MouseButtonWheelUp && m.Action == MouseActionPress:
m.Type = MouseWheelUp
case m.Button == MouseButtonWheelDown && m.Action == MouseActionPress:
m.Type = MouseWheelDown
case m.Button == MouseButtonWheelLeft && m.Action == MouseActionPress:
m.Type = MouseWheelLeft
case m.Button == MouseButtonWheelRight && m.Action == MouseActionPress:
m.Type = MouseWheelRight
case m.Button == MouseButtonBackward && m.Action == MouseActionPress:
m.Type = MouseBackward
case m.Button == MouseButtonForward && m.Action == MouseActionPress:
m.Type = MouseForward
case m.Action == MouseActionMotion:
m.Type = MouseMotion
switch m.Button { //nolint:exhaustive
case MouseButtonLeft:
m.Type = MouseLeft
case MouseButtonMiddle:
m.Type = MouseMiddle
case MouseButtonRight:
m.Type = MouseRight
case MouseButtonBackward:
m.Type = MouseBackward
case MouseButtonForward:
m.Type = MouseForward
}
default:
m.Type = MouseUnknown
}
return m
}