// Raised when each result's view model initializes
private void resultViewModel_Initialized(object o, EventArgs args)
{
if (_updateResultsTimer == null)
{
// Use a throttler so refreshing the paged collection, which can be UI intensive,
// doesn't happen too often
_updateResultsTimer = new ThrottleTimer(500, () =>
{
if (!_cancelled)
{
// Add the initialized results to the public-facing collection
foreach (SearchResultViewModel viewModel in _checkedResults)
{
if (!_results.Contains(viewModel) && viewModel.IsInitialized)
{
_results.Add(viewModel);
}
}
// Update the paged collection of results
PagedResults.Refresh();
if (_numberWebResults == _NUMREQUESTS) // All requests have returned
{
IsSearching = false; // Reset busy state
OnSearchCompleted(); // Raise completed event
}
}
});
}
_updateResultsTimer.Invoke();
}
private ThrottleTimer _layerOrderThrottler; // Throttles re-ordering of layers
private void SelectedLayers_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
// Initialize the re-ordering throttler, if necessary
if (_layerOrderThrottler == null)
{
_layerOrderThrottler = new ThrottleTimer(10, () => { orderSelectedLayers(); });
}
// Invoke the throttler. When it executes, it will re-order the selected layers to match
// their order in the available layers collectino
_layerOrderThrottler.Invoke();
}