public AdminViewModel()
{
Navigation.New = new AwaitableDelegateCommand(() => ConfirmCancelLocker.LockForDurationAsync(NewCallback), () => NewEnableCallback(NewEnable()));
Navigation.Duplicate = new AwaitableDelegateCommand(() => ConfirmCancelLocker.LockForDurationAsync(DuplicateCallback), () => DuplicateEnableCallback(DuplicateEnable()));
Navigation.Modify = new AwaitableDelegateCommand(() => ConfirmCancelLocker.LockForDurationAsync(ModifyCallback), () => ModifyEnableCallback(ModifyEnable()));
Navigation.ReloadCurrent = new AwaitableDelegateCommand(() => RefreshModelInformation(Model.Id), () => ReloadCurrentEnable());
Navigation.Confirm = new AwaitableDelegateCommand(() => ConfirmCancelLocker.LockForDurationAsync(ConfirmCallback), () => ConfirmEnable());
Navigation.Cancel = new AwaitableDelegateCommand(() => ConfirmCancelLocker.LockForDurationAsync(CancelCallback), () => CancelEnable());
Model.ErrorsChanged += Model_ErrorsChanged;
_backForwardNavigator = new ExtendedNavigator <int>();
SetUpNewNavigator();
ConfirmCancelLocker.LockStatusChanged += (s, e) => {
Navigation.New.RaiseCanExecuteChanged();
Navigation.Duplicate.RaiseCanExecuteChanged();
Navigation.Modify.RaiseCanExecuteChanged();
Navigation.Confirm.RaiseCanExecuteChanged();
Navigation.Cancel.RaiseCanExecuteChanged();
};
NewRecordCancelLocker.LockStatusChanged += (s, e) => {
Navigation.Confirm.RaiseCanExecuteChanged();
Navigation.Cancel.RaiseCanExecuteChanged();
};
OutsideModificationLocker.RequestLock(_modifyingToken);
OutsideModificationLocker.LockStatusChanged += (s, e) => OnPropertyChanged(nameof(OutsideModificationAllowed));
}
/// <summary>
/// Used to dispose of resources in use by the <see cref="AdminViewModel{TViewModel, TModel, TModelSearcher}"/>
/// </summary>
/// <param name="disposing"></param>
protected override void Dispose(bool disposing)
{
if (!_disposedValue)
{
if (disposing)
{
ApplicationRestrictor.RequestUnlock(_adminToken);
FamilialLocker.RequestUnlock(_adminToken);
CriticalOperationType = CriticalOperationType.None;
if (ModelSearcher != null)
{
ModelSearcher.SelectedItems.CollectionChanged -= SelectedItems_CollectionChanged;
ModelSearcher.ExportId -= ModelSearcher_ExportId;
ModelSearcher.Cleared -= ModelSearcher_Cleared;
ModelSearcher.RequestEnable(_adminToken);
}
Model.ErrorsChanged -= Model_ErrorsChanged;
Model.Dispose();
_newEnableCallback = null;
_duplicateEnableCallback = null;
_modifyEnableCallback = null;
_backEnableCallback = null;
_forwardEnableCallback = null;
_performDeleteOnRecordEnableCallback = null;
_backForwardNavigator.CurrentItemChangedCallback = null;
_backForwardNavigator?.Dispose();
Navigation.Dispose();
RecordChangeLocker.Dispose();
ConfirmCancelLocker.Dispose();
NewRecordCancelLocker.Dispose();
NavigationalOverride.Dispose();
OutsideModificationLocker.Dispose();
DefaultModelCallback = null;
Locators.ForEach(locator => {
locator.SearchToBegin -= Locator_SearchToBegin;
locator.SearchComplete -= Locator_SearchComplete;
locator.RecordRequested -= Locator_RecordRequested;
locator.RequestEnable(_adminToken);
});
Locators.Clear();
}
_disposedValue = true;
}
base.Dispose(disposing);
}
/// <summary> /// The default enable for the Confirm Command. /// </summary> /// <returns>True enables button. False is a disable.</returns> protected virtual bool ConfirmEnable() => HasErrors == false && Modifying && ConfirmCancelLocker.IsFree() && NavigationalOverride.IsFree();
/// <summary> /// The default enable for the Cancel Command. /// </summary> /// <returns>True enables button. False is a disable.</returns> protected virtual bool CancelEnable() => Modifying && ConfirmCancelLocker.IsFree() && (NewRecordCancelLocker.IsFree() || CriticalOperationType != CriticalOperationType.AddingNewRecord) && NavigationalOverride.IsFree();
