private static int DrawBindingComponent(SerializedProperty componentPathProperty, string componentDescription, SerializedProperty updateTriggerProperty, SerializedProperty unityEventProperty, bool enableUpdateTriggers, bool resolveDataContext)
{
using (var changeScope = new EditorGUI.ChangeCheckScope())
{
EditorGUILayout.PropertyField(componentPathProperty, new GUIContent(componentPathProperty.displayName, componentDescription));
// If the binding target changes, reset the binding update trigger (since the type of the target will determine the available update triggers)
if (changeScope.changed)
{
updateTriggerProperty.intValue = (int)BindingUpdateTrigger.None;
unityEventProperty.stringValue = null;
}
}
Type resolvedType = PropertyBinding.GetComponentType((Component)componentPathProperty.FindPropertyRelative(nameof(PropertyBinding.ComponentPath.Component)).objectReferenceValue, resolveDataContext);
bool isINotifyPropertyChanged = typeof(System.ComponentModel.INotifyPropertyChanged).IsAssignableFrom(resolvedType);
// Try to set the target update trigger to a reasonable default
if (updateTriggerProperty.intValue == (int)BindingUpdateTrigger.None)
{
if (isINotifyPropertyChanged)
{
updateTriggerProperty.intValue = (int)BindingUpdateTrigger.PropertyChangedEvent;
}
}
// If the value never flows back from the target to the source, then there is no reason to pay attention to value change events on the target.
int updateTriggerCount = -1;
if (enableUpdateTriggers)
{
var dropDownMenu = new DropDownMenu();
if (isINotifyPropertyChanged)
{
dropDownMenu.Add(new DropDownItem
{
Label = "Property Changed",
IsSelected = updateTriggerProperty.intValue == (int)BindingUpdateTrigger.PropertyChangedEvent,
Command = () =>
{
updateTriggerProperty.intValue = (int)BindingUpdateTrigger.PropertyChangedEvent;
unityEventProperty.stringValue = null;
}
});
}
List <DropDownItem> unityEvents = PropertyBindingEditor.GetDropUnityEventDownItems(resolvedType, unityEventProperty.stringValue, unityEvent =>
{
unityEventProperty.stringValue = unityEvent;
updateTriggerProperty.intValue = (int)BindingUpdateTrigger.UnityEvent;
}).ToList();
if (dropDownMenu.ItemCount > 0 && unityEvents.Any())
{
dropDownMenu.Add(new DropDownItem());
}
unityEvents.ForEach(dropDownItem => dropDownMenu.Add(dropDownItem));
// Only show the update trigger dropdown if there is more than one choice
if (dropDownMenu.ItemCount > 1)
{
using (new EditorGUI.IndentLevelScope())
{
dropDownMenu.OnGUI("Event");
}
if (dropDownMenu.SelectedIndex < 0)
{
EditorGUILayout.HelpBox($"Select an event that indicates the property has changed, or update the binding mode.", MessageType.Warning);
}
}
updateTriggerCount = dropDownMenu.ItemCount;
}
return(updateTriggerCount);
}
