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RootPage.xaml.cs
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RootPage.xaml.cs
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using System;
using KokoroIO.XamarinForms.ViewModels;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;
namespace KokoroIO.XamarinForms.Views
{
[XamlCompilation(XamlCompilationOptions.Compile)]
public partial class RootPage : MasterDetailPage
{
public RootPage(ApplicationViewModel viewModel)
{
InitializeComponent();
BindingContext = viewModel;
Master = new RoomsPage()
{
BindingContext = new RoomsViewModel(viewModel)
};
var np = new NavigationPage(new ContentPage());
SetupNavigationPage(np);
Detail = np;
viewModel.PropertyChanged += ViewModel_PropertyChanged;
IsPresented = true;
}
private void BackButton_Clicked(object sender, EventArgs e)
{
var vm = BindingContext as ApplicationViewModel;
if (vm != null)
{
vm.SelectedRoom = null;
}
}
private async void ViewModel_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
if (e.PropertyName == nameof(ApplicationViewModel.SelectedRoom))
{
var vm = BindingContext as ApplicationViewModel;
var mp = vm?.SelectedRoom?.GetOrCreateMessagesPage();
if (mp == null)
{
IsPresented = true;
}
else if (Detail is NavigationPage np)
{
if (np.CurrentPage is MessagesPage dp)
{
dp.BindingContext = mp;
np.Title = dp.Title;
IsPresented = false;
}
else
{
await np.PushAsync(new MessagesPage()
{
BindingContext = mp
});
IsPresented = false;
}
}
else
{
np = new NavigationPage(new MessagesPage()
{
BindingContext = mp
});
SetupNavigationPage(np);
Detail = np;
IsPresented = false;
}
}
}
private void SetupNavigationPage(NavigationPage np)
{
np.Popped += NavigationPage_Popped;
}
private void NavigationPage_Popped(object sender, NavigationEventArgs e)
{
IsPresented = true;
}
}
}