func (v *View) onDelete(a *buffer.Action) {
v.onDeleteAdjustTopLine(a)
if v.topLineNum+v.height() <= a.Cursor.LineNum {
// deleted something below the view, don't care
return
}
if a.Cursor.LineNum < v.topLineNum {
// deletion above the top line
if len(a.Lines) == 0 {
return
}
_, last := a.DeletedLines()
if last < v.topLineNum {
// no need to worry
v.cursor.LineNum -= len(a.Lines)
v.dirty |= dirtyStatus
return
}
}
c := v.cursor
c.OnDeleteAdjust(a)
v.MoveCursorTo(c)
v.lastCursorVoffset = v.cursorVoffset
v.dirty = dirtyEverything
}
func (v *View) onDeleteAdjustTopLine(a *buffer.Action) {
if a.Cursor.LineNum < v.topLineNum {
// deletion above the top line
if len(a.Lines) == 0 {
return
}
topnum := v.topLineNum
first, last := a.DeletedLines()
if first <= topnum && topnum <= last {
// deleted the top line, adjust the pointers
if a.Cursor.Line.Next != nil {
v.topLine = a.Cursor.Line.Next
v.topLineNum = a.Cursor.LineNum + 1
} else {
v.topLine = a.Cursor.Line
v.topLineNum = a.Cursor.LineNum
}
v.dirty = dirtyEverything
} else {
// no need to worry
v.topLineNum -= len(a.Lines)
v.dirty |= dirtyStatus
}
}
}
