func scalerValueCallback(r *gtk.Scale, v *ScaledView) {
oldScale := v.scale
oldX := v.scene.hadj.GetValue()
oldY := v.scene.vadj.GetValue()
visMx := float64(v.layoutBox.GetAllocatedWidth()) / 2.0
visMy := float64(v.layoutBox.GetAllocatedHeight()) / 2.0
v.scale = math.Exp2(r.GetValue())
newW, newH := v.guest.Update()
v.scene.hadj.SetUpper(float64(newW))
v.scene.vadj.SetUpper(float64(newH))
v.scene.hadj.SetValue((oldX+visMx)*v.scale/oldScale - visMx)
v.scene.vadj.SetValue((oldY+visMy)*v.scale/oldScale - visMy)
}
// WrapKeyScale wraps a key scale with its information labels if needed (enough values).
//
// (was _pack_hscale).
func WrapKeyScale(key *cftype.Key, child *gtk.Scale) gtk.IWidget {
child.Set("width-request", 150)
if len(key.AuthorizedValues) >= 4 {
child.Set("value-pos", gtk.POS_TOP)
// log.DEV("MISSING SubScale options", string(key.Type), key.AuthorizedValues)
box := newgtk.Box(gtk.ORIENTATION_HORIZONTAL, 0)
// GtkWidget * pAlign = gtk_alignment_new(1., 1., 0., 0.)
labelLeft := newgtk.Label(key.Translate(key.AuthorizedValues[2]))
// pAlign = gtk_alignment_new(1., 1., 0., 0.)
labelRight := newgtk.Label(key.Translate(key.AuthorizedValues[3]))
box.PackStart(labelLeft, false, false, 0)
box.PackStart(child, false, false, 0)
box.PackStart(labelRight, false, false, 0)
return box
}
child.Set("value-pos", gtk.POS_LEFT)
return child
}