using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Shapes; using System.ComponentModel; using GeographicRepresentation.Interfaces; using GeographicRepresentation.Lib; namespace GeographicRepresentation.UILib.View { /// <summary> /// Interaction logic for ContinentsViewGrid.xaml /// </summary> public partial class ContinentsViewGrid : Grid, INotifyPropertyChanged { #region Members IReadOnlyViewModel m_SelectedObject; #endregion #region Properties public IReadOnlyViewModel SelectedObject { get { return m_SelectedObject; } set { m_SelectedObject = value; if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs("SelectedObject")); } } } #endregion #region Methods #region Ctor public ContinentsViewGrid() { InitializeComponent(); m_SelectedObject = null; } #endregion private void Grid_Loaded(object sender, RoutedEventArgs e) { IContinentsListViewModel vm = InterfacesFactory.Instance.GetContinentsListViewModel(); this.DataContext = vm; SelectedObject = vm.Continents[0]; } private void continentsView_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e) { // When the selected item changes, unregister the changed event UnregisterChangedDataEvent(); SelectedObject = e.NewValue as IReadOnlyViewModel; // Register the new selected object to a changed data event RegisterChangedDataEvent(); } private void UnregisterChangedDataEvent() { if (m_SelectedObject != null) { Type[] types = m_SelectedObject.GetType().GetInterfaces(); if (types.Contains(typeof(IReadOnlyContinentViewModel))) { IReadOnlyContinentViewModel vm = m_SelectedObject as IReadOnlyContinentViewModel; vm.OnBestCityToBeInChanged -= this.DataChanged; } else if (types.Contains(typeof(IReadonlyCountryViewModel))) { IReadonlyCountryViewModel vm = m_SelectedObject as IReadonlyCountryViewModel; vm.OnBirthRateChanged -= this.DataChanged; } } } private void RegisterChangedDataEvent() { if (m_SelectedObject != null) { Type[] types = m_SelectedObject.GetType().GetInterfaces(); if (types.Contains(typeof(IReadOnlyContinentViewModel))) { IReadOnlyContinentViewModel vm = m_SelectedObject as IReadOnlyContinentViewModel; vm.OnBestCityToBeInChanged += this.DataChanged; } else if (types.Contains(typeof(IReadonlyCountryViewModel))) { IReadonlyCountryViewModel vm = m_SelectedObject as IReadonlyCountryViewModel; vm.OnBirthRateChanged += this.DataChanged; } } } /// <summary> /// A Change in the data would carry data update /// </summary> private void DataChanged() { SelectedObject = m_SelectedObject; } /// <summary> /// Call for updating the data. This set an asynchronos call for the view model /// </summary> public void UpdateData() { IContinentsListViewModel vm = this.DataContext as IContinentsListViewModel; SimpleOperationDelegate delg = new SimpleOperationDelegate(vm.LoadContinentsFromRepository); delg.BeginInvoke(this.UpdateDataCompleted, delg); } /// <summary> /// Call back for the data reloading. The update should take place in the main thread /// </summary> /// <param name="result"></param> private void UpdateDataCompleted(IAsyncResult result) { System.Windows.Application.Current.Dispatcher.BeginInvoke(new AsyncCallback(this.UpdateDataCompletedInMainThread), result); } /// <summary> /// Update the view /// </summary> /// <param name="result"></param> private void UpdateDataCompletedInMainThread(IAsyncResult result) { if (result.IsCompleted) { continentsView.Items.Refresh(); SimpleOperationDelegate delg = result.AsyncState as SimpleOperationDelegate; delg.EndInvoke(result); } } #region INotifyPropertyChanged Members public event PropertyChangedEventHandler PropertyChanged; #endregion #endregion } }
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