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|
package ansi
import (
"fmt"
)
// MouseButton represents the button that was pressed during a mouse message.
type MouseButton byte
// 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 (
MouseNone MouseButton = iota
MouseButton1
MouseButton2
MouseButton3
MouseButton4
MouseButton5
MouseButton6
MouseButton7
MouseButton8
MouseButton9
MouseButton10
MouseButton11
MouseLeft = MouseButton1
MouseMiddle = MouseButton2
MouseRight = MouseButton3
MouseWheelUp = MouseButton4
MouseWheelDown = MouseButton5
MouseWheelLeft = MouseButton6
MouseWheelRight = MouseButton7
MouseBackward = MouseButton8
MouseForward = MouseButton9
MouseRelease = MouseNone
)
var mouseButtons = map[MouseButton]string{
MouseNone: "none",
MouseLeft: "left",
MouseMiddle: "middle",
MouseRight: "right",
MouseWheelUp: "wheelup",
MouseWheelDown: "wheeldown",
MouseWheelLeft: "wheelleft",
MouseWheelRight: "wheelright",
MouseBackward: "backward",
MouseForward: "forward",
MouseButton10: "button10",
MouseButton11: "button11",
}
// String returns a string representation of the mouse button.
func (b MouseButton) String() string {
return mouseButtons[b]
}
// EncodeMouseButton returns a byte representing a mouse button.
// The button is a bitmask of the following leftmost values:
//
// - The first two bits are the button number:
// 0 = left button, wheel up, or button no. 8 aka (backwards)
// 1 = middle button, wheel down, or button no. 9 aka (forwards)
// 2 = right button, wheel left, or button no. 10
// 3 = release event, wheel right, or button no. 11
//
// - The third bit indicates whether the shift key was pressed.
//
// - The fourth bit indicates the alt key was pressed.
//
// - The fifth bit indicates the control key was pressed.
//
// - The sixth bit indicates motion events. Combined with button number 3, i.e.
// release event, it represents a drag event.
//
// - The seventh bit indicates a wheel event.
//
// - The eighth bit indicates additional buttons.
//
// If button is [MouseNone], and motion is false, this returns a release event.
// If button is undefined, this function returns 0xff.
func EncodeMouseButton(b MouseButton, motion, shift, alt, ctrl bool) (m byte) {
// mouse bit shifts
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 b == MouseNone {
m = bitsMask
} else if b >= MouseLeft && b <= MouseRight {
m = byte(b - MouseLeft)
} else if b >= MouseWheelUp && b <= MouseWheelRight {
m = byte(b - MouseWheelUp)
m |= bitWheel
} else if b >= MouseBackward && b <= MouseButton11 {
m = byte(b - MouseBackward)
m |= bitAdd
} else {
m = 0xff // invalid button
}
if shift {
m |= bitShift
}
if alt {
m |= bitAlt
}
if ctrl {
m |= bitCtrl
}
if motion {
m |= bitMotion
}
return m
}
// x10Offset is the offset for X10 mouse events.
// See https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#Mouse%20Tracking
const x10Offset = 32
// MouseX10 returns an escape sequence representing a mouse event in X10 mode.
// Note that this requires the terminal support X10 mouse modes.
//
// CSI M Cb Cx Cy
//
// See: https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#Mouse%20Tracking
func MouseX10(b byte, x, y int) string {
return "\x1b[M" + string(b+x10Offset) + string(byte(x)+x10Offset+1) + string(byte(y)+x10Offset+1)
}
// MouseSgr returns an escape sequence representing a mouse event in SGR mode.
//
// CSI < Cb ; Cx ; Cy M
// CSI < Cb ; Cx ; Cy m (release)
//
// See: https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#Mouse%20Tracking
func MouseSgr(b byte, x, y int, release bool) string {
s := 'M'
if release {
s = 'm'
}
if x < 0 {
x = -x
}
if y < 0 {
y = -y
}
return fmt.Sprintf("\x1b[<%d;%d;%d%c", b, x+1, y+1, s)
}
|
