# \[Gtk4\] @sigatom
**URL:** https://discourse.julialang.org/t/gtk4-sigatom/133562
**Category:** General Usage
**Tags:** gtk, gtk4
**Created:** [October 30, 2025, 6:57pm UTC](https://discourse.julialang.org/t/gtk4-sigatom/133562 "2025-10-30T18:57:31Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@AdamWysokinski](https://discourse.julialang.org/u/AdamWysokinski)
#### Post date: [October 30, 2025, 6:57pm UTC](https://discourse.julialang.org/t/gtk4-sigatom/133562/1 "2025-10-30T18:57:31Z")
This works in Gtk.jl:
```julia-auto
using Gtk
win = GtkWindow("test")
g = GtkGrid()
sb = GtkSpinButton(1, 10, 1)
s = GtkScale(false, 1, 10, 1)
g[1, 1] = sb
g[1, 2] = s
push!(win, g)
showall(win)
signal_connect(s, "value_changed") do widget
Gtk.@sigatom begin
GAccessor.value(sb, round(Int64, GAccessor.value(s)))
end
end
signal_connect(sb, "changed") do widget
Gtk.@sigatom begin
GAccessor.value(s, GAccessor.value(sb))
end
end
```
but throws a segmentation fault in Gtk4.jl
```julia-auto
using Gtk4
win = GtkWindow("test")
g = GtkGrid()
sb = GtkSpinButton(1, 10, 1)
s = GtkScale(:h, 1, 10, 1)
g[1, 1] = sb
g[1, 2] = s
push!(win, g)
signal_connect(s, "value_changed") do widget
Gtk4.value(sb, round(Int64, Gtk4.value(s)))
end
signal_connect(sb, "changed") do widget
Gtk4.value(s, sb.value)
end
```
since there is no @sigatom in Gtk4.jl
Is there any way to link widgets dynamically using Gtk4?
---
### Author:  [@AdamWysokinski](https://discourse.julialang.org/u/AdamWysokinski)
#### Post date: [October 30, 2025, 7:02pm UTC](https://discourse.julialang.org/t/gtk4-sigatom/133562/2 "2025-10-30T19:02:10Z")
Oh, I’ve just got it to work 😁
```julia-auto
using Gtk4
win = GtkWindow("test")
g = GtkGrid()
sb = GtkSpinButton(1, 10, 1)
s = GtkScale(:h, 1, 10, 1)
g[1, 1] = sb
g[1, 2] = s
push!(win, g)
id1 = signal_connect(s, "value_changed") do widget
signal_handler_block(sb, id2)
Gtk4.value(sb, round(Int64, Gtk4.value(s)))
signal_handler_unblock(sb, id2)
end
id2 = signal_connect(sb, "changed") do widget
signal_handler_block(s, id1)
Gtk4.value(s, sb.value)
signal_handler_unblock(s, id1)
end
```
---
### Author:  [@jwahlstrand](https://discourse.julialang.org/u/jwahlstrand)
#### Post date: [October 30, 2025, 10:41pm UTC](https://discourse.julialang.org/t/gtk4-sigatom/133562/3 "2025-10-30T22:41:54Z")
This works too:
```julia-auto
using Gtk4
win = GtkWindow("test")
g = GtkGrid()
sb = GtkSpinButton(1, 10, 1)
s = GtkScale(:h, 1, 10, 1)
g[1, 1] = sb
g[1, 2] = s
push!(win, g)
signal_connect(s, "value_changed") do widget
@idle_add Gtk4.value(sb, round(Int64, Gtk4.value(s)))
end
signal_connect(sb, "changed") do widget
@idle_add Gtk4.value(s, sb.value)
end
```
---
### Author:  [@AdamWysokinski](https://discourse.julialang.org/u/AdamWysokinski)
#### Post date: [October 31, 2025, 7:45am UTC](https://discourse.julialang.org/t/gtk4-sigatom/133562/4 "2025-10-31T07:45:49Z")
That’s even better, particularly for a larger number of interdependent widgets. Thanks!