// Event handler: A marker, as defined in e.Marker, has been either added (if e.IsNew is true) or deleted (if it is false)
// Depending on which it is, add or delete the tag from the current counter control's list of tags
// If its deleted, remove the tag from the current counter control's list of tags
// Every addition / deletion requires us to:
// - update the contents of the counter control
// - update the data held by the image
// - update the list of markers held by that counter
// - regenerate the list of markers used by the markableCanvas
private void MarkableCanvas_RaiseMarkerEvent(object sender, MarkerEventArgs e)
{
// A marker has been added
if (e.IsNew)
{
DataEntryCounter currentCounter = this.FindSelectedCounter(); // No counters are selected, so don't mark anything
if (currentCounter == null)
{
return;
}
this.MarkableCanvas_AddMarker(currentCounter, e.Marker);
return;
}
// An existing marker has been deleted.
DataEntryCounter counter = (DataEntryCounter)this.DataEntryControls.ControlsByDataLabel[e.Marker.DataLabel];
// Decrement the counter only if there is a number in it
string oldCounterData = counter.Content;
string newCounterData = String.Empty;
if (oldCounterData != String.Empty)
{
int count = Convert.ToInt32(oldCounterData);
count = (count == 0) ? 0 : count - 1; // Make sure its never negative, which could happen if a person manually enters the count
newCounterData = count.ToString();
}
if (!newCounterData.Equals(oldCounterData))
{
// Don't bother updating if the value hasn't changed (i.e., already at a 0 count)
// Update the datatable and database with the new counter values
this.dataHandler.IsProgrammaticControlUpdate = true;
counter.SetContentAndTooltip(newCounterData);
this.dataHandler.IsProgrammaticControlUpdate = false;
this.dataHandler.FileDatabase.UpdateFile(this.dataHandler.ImageCache.Current.ID, counter.DataLabel, newCounterData);
}
// Remove the marker in memory and from the database
MarkersForCounter markersForCounter = null;
foreach (MarkersForCounter markers in this.markersOnCurrentFile)
{
if (markers.Markers.Count == 0)
{
continue;
}
if (markers.Markers[0].DataLabel == markers.DataLabel)
{
markersForCounter = markers;
break;
}
}
if (markersForCounter != null)
{
markersForCounter.RemoveMarker(e.Marker);
this.Speak(counter.Content); // Speak the current count
this.dataHandler.FileDatabase.SetMarkerPositions(this.dataHandler.ImageCache.Current.ID, markersForCounter);
}
this.MarkableCanvas_UpdateMarkers();
}
private void SendMarkerEvent(MarkerEventArgs e)
{
if (this.MarkerEvent != null)
{
this.MarkerEvent(this, e);
}
}
