protected virtual void SubAreaControl_Leaving(object sender, WPFUserControl.AutoCompleteTextBoxControlEventArgs e) { if (SubjectLocationControl.ListBoxReadOnly) { // get the country / area / subarea names from UI var countryName = CountryControl.GetCurrentText(); var areaName = AreaControl.GetCurrentText(); var subAreaName = SubAreaControl.GetCurrentText(); // get country object from UI if (CountryControl.GetCurrentObject() is Country country) { // find the corresponding subject location (need to match country, area and subarea) var subjectLocations = country.SubjectLocations.Where(c => c.Country.Name == countryName && c.Area.Name == areaName && c.SubArea.Name == subAreaName).ToList(); // valid subject Locations if (subjectLocations != null) { // refresh control RefreshControl(subjectLocations?.OfType <Location>().ToList(), SubjectLocationControl); } } } else { RefreshControl(_allSubjectLocations?.OfType <Location>().ToList(), SubjectLocationControl); } // take subarea name from subarea object (if in database) or from UI text SetSubAreaDisplayItem(e.Object is SubArea subArea ? subArea.Name : SubAreaControl.GetCurrentText()); SubjectLocationControl.SetFocus(); }
protected virtual void AreaControl_Leaving(object sender, WPFUserControl.AutoCompleteTextBoxControlEventArgs e) { if (SubAreaControl.ListBoxReadOnly) { // get the subareas and let the base class do the work var countrySubAreas = (CountryControl.GetCurrentObject() as Country)?.SubAreas; var areaSubAreas = (e.Object as Area)?.SubAreas; // valid subareas if ((areaSubAreas != null) && (countrySubAreas != null)) { // get the subareas belong to both selected area and selected country if (GetCountrySubAreas(areaSubAreas.ToList(), countrySubAreas.ToList()) is List <SubArea> matchingSubareas) { // refresh control RefreshControl(matchingSubareas.OfType <Location>().ToList(), SubAreaControl); } } } else { RefreshControl(_allSubAreas.OfType <Location>().ToList(), SubAreaControl); } // derived class can set the view model property // take area name from area object (if in database) or from UI text SetAreaDisplayItem(e.Object is Area area? area.Name : AreaControl.GetCurrentText()); // set focus to the respective text box SubAreaControl.SetFocus(); }