/// <summary>
/// Callback when a key is pressed in the searchbox
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void SearchTextKeyPressed(object sender, KeyEventArgs e)
{
if ((e.Key == Key.Up || e.Key == Key.Down) && CandidatesListBox.Items.Count > 0)
{
int direction = (e.Key == Key.Up) ? -1 : 1;
int index = CandidatesListBox.SelectedIndex;
int maxIndex = CandidatesListBox.Items.Count - 1;
int newIndex = index + direction;
newIndex = (newIndex > maxIndex) ? 0 : (newIndex < 0) ? maxIndex : newIndex;
CandidatesListBox.SelectedItem = CandidatesListBox.Items[newIndex];
}
else if (e.Key == Key.Enter)
{
StopTimer();
UpdateSource(sender as TextBox);
ExecuteSearchCommand();
}
else if (e.Key == Key.Escape)
{
GeoLocatorViewModel viewModel = this.GeoLocatorViewModel;
if (viewModel != null)
{
if (viewModel.GeoLocatorResults != null)
{
// Close the popup
viewModel.GeoLocatorResults = null;
}
}
}
}
/// <summary>
/// Constructs the place finder view model for the specified messenger
/// </summary>
public LiteMapPlaceFinderViewModel(Messenger messenger = null)
: base(messenger)
{
// Instead of sub-classing the toolkit's GeoLocatorViewModel and working with On<property>Changed overrides,
// let's create one directly and use event handlers for dealing with changes in the result
GeoLocatorViewModel = new GeoLocatorViewModel(messenger)
{
DoReplaceSearchStringWithActiveResult = false,
DoShowPopupWithSingleCandidate = true
};
// Set up the event handler
GeoLocatorViewModel.ResultActivated += GeoLocatorViewModel_ResultActivated;
// Set up the recently visited items view model for being able to navigate back
// to previously visited elements
RecentItemsViewModel = new LiteMapRecentlyVisitedItemViewModel(messenger);
// Property change handling
GeoLocatorViewModel.PropertyChanged += GeoLocatorViewModel_PropertyChanged;
RecentItemsViewModel.PropertyChanged += RecentItemsViewModel_PropertyChanged;
// Typing delay before sending request to the geoLocator Viewmodel
TypingDelayBeforeSendingRequest = 750;
// Set up the resources
this.Resources = new ApplicationResources();
// Register to the Messenger
RegisterToMessenger();
}
