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authorJason Smith <jason.smith@xamarin.com>2016-04-24 16:25:26 (GMT)
committerRui Marinho <me@ruimarinho.net>2016-04-24 16:25:26 (GMT)
commit5907152c50ee2c658b266f2804e6b383bb15a6f1 (patch)
tree9beb907623359723456c5c03b08922bebc4f41f3 /Xamarin.Forms.Pages/BaseDataSource.cs
parentfeac1ba3ed6df5e27b3fa2076bd15c190cbacd1c (diff)
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Evolve feature branch (#117)
* Initial import of evolve features * [Android] Add Xamarin.Forms.Platform.Android.AppLinks project * [iOS] Fix issues with c# 6 features on iOS AppLinks * Added naive stanza to update-docs-windows.bat to produce Pages docs. Not tested. (#69) * Update packages * Add AppLinks android nuspec and fix linker issues * Fix build * Fix nusepc * Fix nuspec * Update android support nugets to 23.2.1 * Update Xamarin.UITest * Add CardView * [iOS] Fix app link for CoreSpotlight * [Android] Update AppLinks android support libs * Add Newtonsoft.Json dependency to nuspec * Fix NRE when setting ControlTemplate to null * Move to ModernHttpClient for download * Try fix build * Preserve android app links * Fix margin issue * General coding and simple fixes
Diffstat (limited to 'Xamarin.Forms.Pages/BaseDataSource.cs')
-rw-r--r--Xamarin.Forms.Pages/BaseDataSource.cs113
1 files changed, 113 insertions, 0 deletions
diff --git a/Xamarin.Forms.Pages/BaseDataSource.cs b/Xamarin.Forms.Pages/BaseDataSource.cs
new file mode 100644
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+++ b/Xamarin.Forms.Pages/BaseDataSource.cs
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+using System.Collections.Generic;
+using System.Collections.Specialized;
+using System.ComponentModel;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Threading.Tasks;
+
+namespace Xamarin.Forms.Pages
+{
+ public abstract class BaseDataSource : IDataSource, INotifyPropertyChanged
+ {
+ readonly DataSourceList _dataSourceList = new DataSourceList();
+ bool _initialized;
+ bool _isLoading;
+
+ public IReadOnlyList<IDataItem> Data
+ {
+ get
+ {
+ Initialize();
+ return _dataSourceList;
+ }
+ }
+
+ public bool IsLoading
+ {
+ get { return _isLoading; }
+ set
+ {
+ if (_isLoading == value)
+ return;
+ _isLoading = value;
+ OnPropertyChanged();
+ }
+ }
+
+#pragma warning disable CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed
+ public object this[string key]
+ {
+ get
+ {
+ Initialize();
+ return GetValue(key);
+ }
+ set
+ {
+ Initialize();
+ if (SetValue(key, value))
+ OnKeyChanged(key);
+ }
+ }
+#pragma warning restore CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed
+
+ IEnumerable<string> IDataSource.MaskedKeys => _dataSourceList.MaskedKeys;
+
+ async void IDataSource.MaskKey(string key)
+ {
+ await Initialize();
+ _dataSourceList.MaskKey(key);
+ }
+
+ async void IDataSource.UnmaskKey(string key)
+ {
+ await Initialize();
+ _dataSourceList.UnmaskKey(key);
+ }
+
+ event PropertyChangedEventHandler INotifyPropertyChanged.PropertyChanged
+ {
+ add { PropertyChanged += value; }
+ remove { PropertyChanged -= value; }
+ }
+
+ protected abstract Task<IList<IDataItem>> GetRawData();
+
+ protected abstract object GetValue(string key);
+
+ protected void OnPropertyChanged([CallerMemberName] string property = null)
+ {
+ PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(property));
+ }
+
+ protected abstract bool SetValue(string key, object value);
+
+ async Task Initialize()
+ {
+ // Do this lazy because GetRawData is virtual and calling it in the ctor is therefor unfriendly
+ if (_initialized)
+ return;
+ _initialized = true;
+ IList<IDataItem> rawData = await GetRawData();
+ if (!(rawData is INotifyCollectionChanged))
+ {
+ Log.Warning("Xamarin.Forms.Pages", "DataSource does not implement INotifyCollectionChanged, updates will not be reflected");
+ rawData = rawData.ToList(); // Make a copy so we can be sure this list wont change out from under us
+ }
+ _dataSourceList.MainList = rawData;
+
+ // Test if INPC("Item") is enough to trigger a full reset rather than triggering a new event for each key?
+ foreach (IDataItem dataItem in rawData)
+ {
+ OnKeyChanged(dataItem.Name);
+ }
+ }
+
+ void OnKeyChanged(string key)
+ {
+ PropertyChanged?.Invoke(this, new PropertyChangedEventArgs($"Item[{key}]"));
+ }
+
+ event PropertyChangedEventHandler PropertyChanged;
+ }
+} \ No newline at end of file