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navigation.go
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navigation.go
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package main
import (
"github.com/stretto-editor/gocui"
)
func cursorHome(g *gocui.Gui, v *gocui.View) error {
if v != nil {
_, cy := v.Cursor()
_, oy := v.Origin()
v.SetOrigin(0, oy)
v.SetCursor(0, cy)
}
updateInfos(g)
g.CurrentView().Actions.Cut()
return nil
}
func cursorEnd(g *gocui.Gui, v *gocui.View) error {
if v != nil {
_, cy := v.Cursor()
_, oy := v.Origin()
x, _ := v.Size()
l, _ := v.Line(cy)
if len(l) > x {
v.SetOrigin(len(l)-x+1, oy)
v.SetCursor(x-1, cy)
} else {
v.SetCursor(len(l), cy)
}
}
updateInfos(g)
g.CurrentView().Actions.Cut()
return nil
}
func goPgUp(g *gocui.Gui, v *gocui.View) error {
if v != nil {
ox, oy := v.Origin()
_, y := v.Size()
yOffset := oy - y
if yOffset < 0 {
if err := v.SetOrigin(ox, 0); err != nil {
return err
}
if oy == 0 {
_, cy := v.Cursor()
v.MoveCursor(0, -cy, false)
} else {
v.MoveCursor(0, 0, false)
}
} else {
v.SetOrigin(ox, yOffset)
v.MoveCursor(0, 0, false)
}
}
updateInfos(g)
g.CurrentView().Actions.Cut()
return nil
}
func goPgDown(g *gocui.Gui, v *gocui.View) error {
if v != nil {
ox, oy := v.Origin()
_, y := v.Size()
_, cy := v.Cursor()
if y >= v.BufferSize() {
v.MoveCursor(0, y-cy, false)
} else if oy >= v.BufferSize()-y {
v.MoveCursor(0, y, false)
} else if oy+2*y >= v.BufferSize() {
v.SetOrigin(ox, v.BufferSize()-y+1)
v.MoveCursor(0, 0, false)
} else {
v.SetOrigin(ox, oy+y)
v.MoveCursor(0, 0, false)
}
}
updateInfos(g)
g.CurrentView().Actions.Cut()
return nil
}
func moveLeft(g *gocui.Gui, v *gocui.View) error {
moveAndInfo(g, v, -1, 0, false)
return nil
}
func moveRight(g *gocui.Gui, v *gocui.View) error {
moveAndInfo(g, v, 1, 0, false)
return nil
}
func moveUp(g *gocui.Gui, v *gocui.View) error {
moveAndInfo(g, v, 0, -1, false)
return nil
}
func moveDown(g *gocui.Gui, v *gocui.View) error {
moveAndInfo(g, v, 0, 1, false)
return nil
}
func scrollUp(g *gocui.Gui, v *gocui.View) error {
_, oy := v.Origin()
if oy != 0 {
v.SetOrigin(0, oy-1)
}
updateInfos(g)
g.CurrentView().Actions.Cut()
return nil
}
func scrollDown(g *gocui.Gui, v *gocui.View) error {
_, oy := v.Origin()
// allowed infinite scroll
v.SetOrigin(0, oy+1)
updateInfos(g)
g.CurrentView().Actions.Cut()
return nil
}
func moveAndInfo(g *gocui.Gui, v *gocui.View, x int, y int, b bool) {
v.MoveCursor(x, y, b)
updateInfos(g)
g.CurrentView().Actions.Cut()
}