private List <PushpinModel> GetVoterList()
{
VoterFileDataContext _voterDB = new mapapp.data.VoterFileDataContext(string.Format(mapapp.data.VoterFileDataContext.DBConnectionString, App.thisApp._settings.DbFileName));
System.Diagnostics.Debug.Assert(_voterDB.DatabaseExists());
List <PushpinModel> _list = new List <PushpinModel>();
if (!(App.thisApp._settings.DbStatus == DbState.Loaded))
{
App.Log("Database not ready to load voters yet.");
return(_list);
}
IEnumerable <VoterFileEntry> data = from VoterFileEntry voter in _voterDB.AllVoters select voter;
PushpinModel _pin;
int _counter = 0;
foreach (VoterFileEntry _v in data)
{
_pin = new PushpinModel(_v);
if (0.0 == _pin.Location.Latitude || 0.0 == _pin.Location.Longitude)
{
App.Log("Skipping voter with no location:" + _pin.Address);
continue;
}
_counter++;
if (!_pin.Location.IsUnknown)
{
_pin.Visibility = Visibility.Visible;
_list.Add(_pin);
}
else
{
System.Diagnostics.Debug.WriteLine("Error: A pin doesn't have a location: " + _pin.Content);
// This pin doesn't have valid location info - Set the location for the pushpin to the center of the street or precinct
StreetPinModel _street = (from StreetPinModel _st in Streets where _st.Content == _pin.Street select _st).FirstOrDefault();
if (_street != null)
{
_pin.Location = _street.Center;
App.Log(string.Format("Voter at {0} lacks location, setting to center of {1} street.", _pin.Address, _street.Content));
_list.Add(_pin);
}
}
}
if (_list.Count == 0 || _counter == 0)
{
App.Log("There are no voters around here!");
}
else
{
System.Diagnostics.Debug.WriteLine("Found {0} voters near here.", _counter);
}
_voterDB.Dispose();
return(_list);
}
private void Street_Hold(object sender, System.Windows.Input.GestureEventArgs e)
{
if (sender is Pushpin)
{
Pushpin pinHeld = sender as Pushpin;
if (pinHeld.DataContext is StreetPinModel)
{
StreetPinModel pinModel = pinHeld.DataContext as StreetPinModel;
_StreetFilter = pinModel.StreetEntry.Name;
Zoom = 15.0; // Force zoom to be just outside of the "showStreets" range
Map.ZoomLevel = Zoom;
Center = pinModel.Center;
ShowPushpins = true;
ShowPrecincts = false;
ShowStreets = false;
App.Log(string.Format("{0} street selected", _StreetFilter));
wait.Set();
}
}
}
private void LoadStreets()
{
VoterFileDataContext _voterDB = new mapapp.data.VoterFileDataContext(string.Format(mapapp.data.VoterFileDataContext.DBConnectionString, App.thisApp._settings.DbFileName));
System.Diagnostics.Debug.Assert(_voterDB.DatabaseExists());
if (!(App.thisApp._settings.DbStatus == DbState.Loaded))
{
App.Log("Database not ready to load streets yet.");
return;
}
IEnumerable <StreetTableEntry> streets = (from street in _voterDB.Streets select street);
foreach (StreetTableEntry street in streets)
{
App.Log(" Adding street: " + street.Name);
StreetPinModel pPin = new StreetPinModel(street);
Streets.Add(pPin);
}
_voterDB.Dispose();
}
public void BackgroundThread()
{
// LoadPushPins();
App.Log("Started background thread...");
LocationRect _lastRect = null;
double _lastZoom = 0.0;
while (wait.WaitOne())
{
App.Log(" Wait completed at top of background thread loop.");
wait.Reset();
if (running == false)
{
App.Log(" Exiting background thread.");
wait.Close();
wait.Dispose();
return;
}
try
{
if (Precincts.Count == 0)
{
App.Log(" Invoking LoadPrecincts...");
Dispatcher.BeginInvoke(LoadPrecincts);
}
if (Streets.Count == 0)
{
App.Log(" Invoking LoadStreets...");
Dispatcher.BeginInvoke(LoadStreets);
}
LocationRect lr = Map.BoundingRectangle;
if (lr.Equals(_lastRect)) // NOTE: the rect can only be equal if both center and zoom level are unchanged.
{
App.Log(" We haven't moved, continuing...");
continue;
}
bool bfullcontent = false;
if (_showDetails)
{
bfullcontent = true;
}
App.Log(" Made it through prelims - still here.");
IEnumerable <PushpinModel> selectedVoters = listModels.AsEnumerable();
if (true) // (!_dataView.IsWithinView(lr)) NOTE: Quick hack for TechRoanoke conference
{
App.Log(" Calling GetVoterList...");
selectedVoters = GetVoterList();
App.Log(String.Format(" {0} voters are in current voter list.", selectedVoters.Count()));
App.Log(" GetVoterList call completed.");
}
else
{
App.Log(" Still within current dataview, skipping call to GetLocalVoters.");
if (lr.Center == _lastRect.Center && zoomlevel == _lastZoom)
{
App.Log(" Still in same location. continuing...");
continue;
}
}
_lastRect = lr;
_lastZoom = zoomlevel;
// Now filter on precinct if set
if (_PrecinctFilter != "")
{
// _dataViewPins = from <PushpinModel> voter in _dataViewPins where voter.
selectedVoters = from PushpinModel aVoter in selectedVoters where aVoter.Precinct == _PrecinctFilter select aVoter;
App.Log(String.Format(" {0} voters are in {1} precinct.", selectedVoters.Count(), _PrecinctFilter));
}
// Now filter on street if selected
if (_StreetFilter != "")
{
selectedVoters = from PushpinModel aVoter in selectedVoters where aVoter.Street == _StreetFilter select aVoter;
App.Log(String.Format(" {0} voters are in {1} precinct and live on {2}.", selectedVoters.Count(), _PrecinctFilter, _StreetFilter));
}
// If resulting list is still more than preset limit (do 300 for now) then filter to nearest 300
if (selectedVoters.Count() > _MaxVotersInView)
{
_dataViewPins = GetViewVoterList(lr.Center, selectedVoters);
}
else
{
_dataViewPins = selectedVoters.ToList();
}
List <PushpinModel> l = new List <PushpinModel>(_dataViewPins.AsEnumerable());
int total = 0;
if (wait.WaitOne(0))
{
App.Log(" Wait was not signaled, continuing.");
continue;
}
App.Log(" Adding filtered pushpins to listModel.");
listModels.Clear();
foreach (PushpinModel p in l)
{
total++;
if (bfullcontent)
{
p.Content = p.FullName + "\r" + p.VoterFile.Address + " " + p.VoterFile.Address2;
}
else
{
p.Content = p.VoterFile.LastName;
}
if (p.Location.IsUnknown || p.Location.Latitude < 25.3 || p.Location.Longitude > -67.0)
{
// This pin doesn't have valid location info - Set the location for the pushpin to the center of the street or precinct
StreetPinModel _street = (from StreetPinModel _st in Streets where _st.Content == p.Street select _st).FirstOrDefault();
if (_street != null)
{
p.Location = _street.Center;
App.Log(string.Format("Voter at {0} lacks location, setting to center of {1} street.", p.Address, _street.Content));
}
}
listModels.Add(p);
if (wait.WaitOne(0))
{
break;
}
}
}
catch (ThreadAbortException)
{
running = false;
wait.Close();
wait.Dispose();
return;
}
catch (Exception ex)
{
App.Log("Something went wrong in the background thread. " + ex.ToString());
}
if (wait.WaitOne(0))
{
App.Log(" Wait was not signaled, continuing (4).");
continue;
}
App.Log(" Invoking UpdatePins...");
Dispatcher.BeginInvoke(UpdatePins);
}
running = false;
wait.Close();
wait.Dispose();
return;
}
