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//go:build windows
// +build windows
package cursor
import (
"syscall"
"unsafe"
)
// Up moves the cursor n lines up relative to the current position.
func (c *Cursor) Up(n int) {
c.move(0, -n)
}
// Down moves the cursor n lines down relative to the current position.
func (c *Cursor) Down(n int) {
c.move(0, n)
}
// Right moves the cursor n characters to the right relative to the current position.
func (c *Cursor) Right(n int) {
c.move(n, 0)
}
// Left moves the cursor n characters to the left relative to the current position.
func (c *Cursor) Left(n int) {
c.move(-n, 0)
}
func (c *Cursor) move(x int, y int) {
handle := syscall.Handle(c.writer.Fd())
var csbi consoleScreenBufferInfo
_, _, _ = procGetConsoleScreenBufferInfo.Call(uintptr(handle), uintptr(unsafe.Pointer(&csbi)))
var cursor coord
cursor.x = csbi.cursorPosition.x + short(x)
cursor.y = csbi.cursorPosition.y + short(y)
_, _, _ = procSetConsoleCursorPosition.Call(uintptr(handle), uintptr(*(*int32)(unsafe.Pointer(&cursor))))
}
// HorizontalAbsolute moves the cursor to n horizontally.
// The position n is absolute to the start of the line.
func (c *Cursor) HorizontalAbsolute(n int) {
handle := syscall.Handle(c.writer.Fd())
var csbi consoleScreenBufferInfo
_, _, _ = procGetConsoleScreenBufferInfo.Call(uintptr(handle), uintptr(unsafe.Pointer(&csbi)))
var cursor coord
cursor.x = short(n)
cursor.y = csbi.cursorPosition.y
if csbi.size.x < cursor.x {
cursor.x = csbi.size.x
}
_, _, _ = procSetConsoleCursorPosition.Call(uintptr(handle), uintptr(*(*int32)(unsafe.Pointer(&cursor))))
}
// Show the cursor if it was hidden previously.
// Don't forget to show the cursor at least at the end of your application.
// Otherwise the user might have a terminal with a permanently hidden cursor, until he reopens the terminal.
func (c *Cursor) Show() {
handle := syscall.Handle(c.writer.Fd())
var cci consoleCursorInfo
_, _, _ = procGetConsoleCursorInfo.Call(uintptr(handle), uintptr(unsafe.Pointer(&cci)))
cci.visible = 1
_, _, _ = procSetConsoleCursorInfo.Call(uintptr(handle), uintptr(unsafe.Pointer(&cci)))
}
// Hide the cursor.
// Don't forget to show the cursor at least at the end of your application with Show.
// Otherwise the user might have a terminal with a permanently hidden cursor, until he reopens the terminal.
func (c *Cursor) Hide() {
handle := syscall.Handle(c.writer.Fd())
var cci consoleCursorInfo
_, _, _ = procGetConsoleCursorInfo.Call(uintptr(handle), uintptr(unsafe.Pointer(&cci)))
cci.visible = 0
_, _, _ = procSetConsoleCursorInfo.Call(uintptr(handle), uintptr(unsafe.Pointer(&cci)))
}
// ClearLine clears the current line and moves the cursor to its start position.
func (c *Cursor) ClearLine() {
handle := syscall.Handle(c.writer.Fd())
var csbi consoleScreenBufferInfo
_, _, _ = procGetConsoleScreenBufferInfo.Call(uintptr(handle), uintptr(unsafe.Pointer(&csbi)))
var w uint32
var x short
cursor := csbi.cursorPosition
x = csbi.size.x
_, _, _ = procFillConsoleOutputCharacter.Call(uintptr(handle), uintptr(' '), uintptr(x), uintptr(*(*int32)(unsafe.Pointer(&cursor))), uintptr(unsafe.Pointer(&w)))
}
// Clear clears the current position and moves the cursor to the left.
func (c *Cursor) Clear() {
handle := syscall.Handle(c.writer.Fd())
var csbi consoleScreenBufferInfo
_, _, _ = procGetConsoleScreenBufferInfo.Call(uintptr(handle), uintptr(unsafe.Pointer(&csbi)))
var w uint32
cursor := csbi.cursorPosition
_, _, _ = procFillConsoleOutputCharacter.Call(uintptr(handle), uintptr(' '), uintptr(1), uintptr(*(*int32)(unsafe.Pointer(&cursor))), uintptr(unsafe.Pointer(&w)))
if cursor.x > 0 {
cursor.x--
}
_, _, _ = procSetConsoleCursorPosition.Call(uintptr(handle), uintptr(*(*int32)(unsafe.Pointer(&cursor))))
}
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