private void ReloadViewModel()
{
Debug.Assert(_context != null, "ExplorerFrame was disposed");
// if _viewModelHelper doesn't exist then create and subscribe to ViewModelChanged event
if (_viewModelHelper == null)
{
_viewModelHelper = GetNewExplorerViewModelHelper();
_viewModelHelper.ExplorerViewModelChanged += OnViewModelChange;
}
// create a new ViewModel and assign it to the ViewModelHelper - this
// will cause ViewModelChanged event to be fired and we will update
// the DataContext in OnViewModelChange() below
_viewModelHelper.CreateViewModel(_context);
}
// Invoked when the user clicks the Search Go Button
private void OnSearchCommand()
{
var previousCursor = _frameContent.Cursor;
try
{
_frameContent.Cursor = Cursors.AppStarting;
SearchComboBox.IsHitTestVisible = false;
_frameContent.UpdateLayout();
var searchCriteria = SearchComboBox.Text.Trim();
if (string.IsNullOrEmpty(searchCriteria))
{
// textbox could have whitespace in it - if so do not search but need to set
// textbox text back to empty to re-enable search button
SearchComboBox.Text = string.Empty;
// Note: without below search combo box is not enabled after first call
SearchComboBox.IsHitTestVisible = true;
}
else
{
// Do the actual search and put the results into a SearchResults (which is an editing context item)
var searchResults = ExplorerViewModelHelper.SearchModelByDisplayName(searchCriteria);
if (!SearchComboBox.Items.Contains(searchCriteria))
{
SearchComboBox.Items.Insert(0, searchCriteria);
}
DisplaySearchResults(searchResults, false);
}
}
finally
{
_frameContent.Cursor = previousCursor;
}
}
