forked from Mirrors/bubbletea
109 lines
1.9 KiB
Go
109 lines
1.9 KiB
Go
package tea
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import "errors"
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type MouseMsg MouseEvent
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// MouseEvent represents a mouse event, which could be a click, a scroll wheel
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// movement, a cursor movement, or a combination.
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type MouseEvent struct {
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X int
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Y int
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Type MouseEventType
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Alt bool
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Ctrl bool
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}
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// String returns a string representation of a mouse event.
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func (m MouseEvent) String() (s string) {
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if m.Ctrl {
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s += "ctrl+"
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}
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if m.Alt {
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s += "alt+"
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}
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s += mouseEventTypes[m.Type]
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return s
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}
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// MouseEventType indicates the type of mouse event occurring.
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type MouseEventType int
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const (
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MouseUnknown MouseEventType = iota
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MouseLeft
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MouseRight
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MouseMiddle
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MouseRelease
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MouseWheelUp
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MouseWheelDown
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MouseMotion
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)
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var mouseEventTypes = map[MouseEventType]string{
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MouseUnknown: "unknown",
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MouseLeft: "left",
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MouseRight: "right",
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MouseMiddle: "middle",
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MouseRelease: "release",
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MouseWheelUp: "wheel up",
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MouseWheelDown: "wheel down",
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MouseMotion: "motion",
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}
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// Parse an X10-encoded mouse event; the simplest kind. The last release of
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// X10 was December 1986, by the way.
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//
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// X10 mouse events look like:
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//
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// ESC [M Cb Cx Cy
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//
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func parseX10MouseEvent(buf []byte) (m MouseEvent, err error) {
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if len(buf) != 6 || string(buf[:3]) != "\x1b[M" {
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return m, errors.New("not an X10 mouse event")
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}
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e := buf[3] - 32
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switch e {
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case 35:
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m.Type = MouseMotion
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case 64:
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m.Type = MouseWheelUp
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case 65:
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m.Type = MouseWheelDown
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default:
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switch e & 3 {
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case 0:
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if e&64 != 0 {
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m.Type = MouseWheelUp
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} else {
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m.Type = MouseLeft
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}
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case 1:
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if e&64 != 0 {
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m.Type = MouseWheelDown
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} else {
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m.Type = MouseMiddle
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}
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case 2:
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m.Type = MouseRight
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case 3:
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m.Type = MouseRelease
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}
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}
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if e&8 != 0 {
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m.Alt = true
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}
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if e&16 != 0 {
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m.Ctrl = true
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}
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// (1,1) is the upper left. We subtract 1 to normalize it to (0,0).
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m.X = int(buf[4]) - 32 - 1
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m.Y = int(buf[5]) - 32 - 1
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return m, nil
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}
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