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expressionhelper.go
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expressionhelper.go
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package obsfx
import (
"reflect"
)
type ExpressionHelper[T any] interface {
InvalidationListener
AddListener(listener InvalidationListener) ExpressionHelper[T]
RemoveListener(listener InvalidationListener) ExpressionHelper[T]
AddChangeListener(listener ChangeListener[T]) ExpressionHelper[T]
RemoveChangeListener(listener ChangeListener[T]) ExpressionHelper[T]
}
type genericInvalidationExpressionHelper[T any] struct {
invalidationListeners HasListenersBase[InvalidationListener]
changeListeners HasListenersBase[ChangeListener[T]]
currentValue T
}
func newGenericInvalidationExpressionHelper[T any](invalidationListeners []InvalidationListener, changeListeners []ChangeListener[T]) *genericInvalidationExpressionHelper[T] {
g := &genericInvalidationExpressionHelper[T]{}
for _, l := range invalidationListeners {
g.AddListener(l)
}
for _, l := range changeListeners {
g.AddChangeListener(l)
}
return g
}
func (g *genericInvalidationExpressionHelper[T]) OnInvalidated(observable Observable) {
g.invalidationListeners.ForEachListener(func(l InvalidationListener) bool {
l.OnInvalidated(observable)
return true
})
if len(g.changeListeners.listeners) > 0 {
obs := observable.(ObservableValue[T])
previous := g.currentValue
val := obs.Value()
if reflect.DeepEqual(previous, val) {
return
}
g.currentValue = val
g.changeListeners.ForEachListener(func(l ChangeListener[T]) bool {
l.OnChanged(obs, previous, val)
return true
})
}
}
func (g *genericInvalidationExpressionHelper[T]) AddListener(listener InvalidationListener) ExpressionHelper[T] {
g.invalidationListeners.AddListener(listener)
return g
}
func (g *genericInvalidationExpressionHelper[T]) RemoveListener(listener InvalidationListener) ExpressionHelper[T] {
g.invalidationListeners.RemoveListener(listener)
return g
}
func (g *genericInvalidationExpressionHelper[T]) AddChangeListener(listener ChangeListener[T]) ExpressionHelper[T] {
g.changeListeners.AddListener(listener)
return g
}
func (g *genericInvalidationExpressionHelper[T]) RemoveChangeListener(listener ChangeListener[T]) ExpressionHelper[T] {
g.changeListeners.RemoveListener(listener)
return g
}
type singleInvalidationExpressionHelper[T any] struct {
listener InvalidationListener
}
func NewSingleInvalidationExpressionHelper[T any](listener InvalidationListener) ExpressionHelper[T] {
return &singleInvalidationExpressionHelper[T]{listener: listener}
}
func (s *singleInvalidationExpressionHelper[T]) AddChangeListener(listener ChangeListener[T]) ExpressionHelper[T] {
return newGenericInvalidationExpressionHelper[T]([]InvalidationListener{s.listener}, []ChangeListener[T]{listener})
}
func (s *singleInvalidationExpressionHelper[T]) RemoveChangeListener(listener ChangeListener[T]) ExpressionHelper[T] {
return s
}
func (s *singleInvalidationExpressionHelper[T]) AddListener(listener InvalidationListener) ExpressionHelper[T] {
if reflect.DeepEqual(s.listener, listener) {
return s
}
return newGenericInvalidationExpressionHelper[T]([]InvalidationListener{s.listener, listener}, nil)
}
func (s *singleInvalidationExpressionHelper[T]) RemoveListener(listener InvalidationListener) ExpressionHelper[T] {
if reflect.DeepEqual(s.listener, listener) {
return nil
}
return s
}
func (s *singleInvalidationExpressionHelper[T]) OnInvalidated(obs Observable) {
s.listener.OnInvalidated(obs)
}
type singleChangeListenerExpressionHelper[T any] struct {
listener ChangeListener[T]
currentValue T
}
func NewSingleChangeListenerExpressionHelper[T any](listener ChangeListener[T]) ExpressionHelper[T] {
return &singleChangeListenerExpressionHelper[T]{listener: listener}
}
func (s *singleChangeListenerExpressionHelper[T]) OnInvalidated(observable Observable) {
obs := observable.(ObservableValue[T])
previous := s.currentValue
val := obs.Value()
if reflect.DeepEqual(previous, val) {
return
}
s.currentValue = val
s.listener.OnChanged(obs, previous, val)
}
func (s *singleChangeListenerExpressionHelper[T]) AddListener(listener InvalidationListener) ExpressionHelper[T] {
return newGenericInvalidationExpressionHelper[T]([]InvalidationListener{listener}, []ChangeListener[T]{s.listener})
}
func (s *singleChangeListenerExpressionHelper[T]) RemoveListener(listener InvalidationListener) ExpressionHelper[T] {
return s
}
func (s *singleChangeListenerExpressionHelper[T]) AddChangeListener(listener ChangeListener[T]) ExpressionHelper[T] {
if reflect.DeepEqual(s.listener, listener) {
return s
}
return newGenericInvalidationExpressionHelper[T](nil, []ChangeListener[T]{s.listener, listener})
}
func (s *singleChangeListenerExpressionHelper[T]) RemoveChangeListener(listener ChangeListener[T]) ExpressionHelper[T] {
if reflect.DeepEqual(s.listener, listener) {
return nil
}
return s
}