public SearchOptionsViewModel(ISearchMetadataCollection metadataCollection, ISchedulerProvider schedulerProvider)
{
//TODO: options for colour
var swatches = new SwatchesProvider().Swatches;
ReadOnlyObservableCollection<SearchOptionsProxy> data;
var userOptions = metadataCollection.Metadata.Connect()
.WhereReasonsAre(ChangeReason.Add, ChangeReason.Remove) //ignore updates because we update from here
.Transform(meta => new SearchOptionsProxy(meta, swatches,m => metadataCollection.Remove(m.SearchText)))
.SubscribeMany(so =>
{
//when a value changes, write the original value back to the cache
return so.WhenAnyPropertyChanged()
.Subscribe(_ => metadataCollection.Add(new SearchMetadata(so.Text, so.Filter, so.Highlight)));
})
.Sort(SortExpressionComparer<SearchOptionsProxy>.Ascending(proxy=>proxy.Text))
.ObserveOn(schedulerProvider.MainThread)
.Bind(out data)
.Subscribe();
Data = data;
AddSearchCommand = new Command(() =>
{
metadataCollection.Add(new SearchMetadata(SearchText,false,true));
SearchText = string.Empty;
}, () => SearchText.IsLongerThanOrEqualTo(3) && !metadataCollection.Metadata.Lookup((CaseInsensitiveString)SearchText).HasValue);
var commandRefresher = this.WhenValueChanged(vm => vm.SearchText)
.Subscribe(_ => ((Command) AddSearchCommand).Refresh());
//User feedback to guide them whilst typing
SearchHint = this.WhenValueChanged(vm => vm.SearchText)
.Select(text =>
{
if (string.IsNullOrEmpty(text)) return "Type to highlight";
return text.Length < 3 ? "Enter at least 3 characters" : "Hit enter for more options";
}).ForBinding();
_cleanUp = new CompositeDisposable(commandRefresher, userOptions, SearchHint);
}
public SearchOptionsViewModel(ISearchMetadataCollection metadataCollection,
ISchedulerProvider schedulerProvider,
SearchHints searchHints)
{
SearchHints = searchHints;
//TODO: options for colour
var swatches = new SwatchesProvider().Swatches;
ReadOnlyObservableCollection<SearchOptionsProxy> data;
var userOptions = metadataCollection.Metadata.Connect()
.WhereReasonsAre(ChangeReason.Add, ChangeReason.Remove) //ignore updates because we update from here
.Transform(meta => new SearchOptionsProxy(meta, swatches,m => metadataCollection.Remove(m.SearchText)))
.SubscribeMany(so =>
{
//when a value changes, write the original value back to the cache
return so.WhenAnyPropertyChanged()
.Subscribe(_ => metadataCollection.Add(new SearchMetadata(so.Text, so.Filter, so.Highlight,so.UseRegex,so.IgnoreCase)));
})
.Sort(SortExpressionComparer<SearchOptionsProxy>.Ascending(proxy=>proxy.Text))
.ObserveOn(schedulerProvider.MainThread)
.Bind(out data)
.Subscribe();
Data = data;
//command to add the current search to the tail collection
var searchInvoker = SearchHints.SearchRequested.Subscribe(request =>
{
metadataCollection.Add(new SearchMetadata(request.Text, false, true, request.UseRegEx, true));
});
_cleanUp = new CompositeDisposable(searchInvoker, userOptions, searchInvoker);
}