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VincentH-Net/MainView.cs

Last active Dec 26, 2015
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Main view code for Android Cloud Auction example app, built with MvvmQuickCross
using Android.App;
using Android.Views;
using Android.OS;
using Android.Content.PM;
using MvvmQuickCross;
using CloudAuction.Shared;
using CloudAuction.Shared.ViewModels;
namespace CloudAuction
{
[Activity(Label = "Cloud Auction", MainLauncher = true, LaunchMode = LaunchMode.SingleTask, Icon = "@drawable/icon")]
public class MainView : ActivityViewBase<MainViewModel>
{
public static MainViewModel.SubView CurrentSubView;
private CloudAuctionApplication EnsureApplication()
{
return CloudAuctionApplication.Instance ?? new CloudAuctionApplication(new CloudAuctionNavigator());
}
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
SetContentView(Resource.Layout.MainView);
ActionBar.NavigationMode = ActionBarNavigationMode.Tabs;
// One-time initialization of application and helpers.
// This can be done in the startup view, or in the android application object, or in the application loading screen.
EnsureApplication();
AndroidHelpers.Initialize(typeof(Resource));
CloudAuctionApplication.Instance.ContinueToMain(skipNavigation: true);
// Ensure that our viewmodel is initialized, in case we navigated to this view by some other means
// than through a call to CloudAuctionApplication.Instance.ContinueToMain().
// E.g. when the OS creates this view at application startup, because it is marked as MainLauncher.
ActionBar.Tab[] tabs = new ActionBar.Tab[] {
ActionBar.NewTab().SetText("Auction").SetTag(new Fragment()),
ActionBar.NewTab().SetText("Products").SetTag(new Fragment()),
ActionBar.NewTab().SetText("Help").SetTag(new Fragment()) };
foreach (var tab in tabs) tab.TabSelected += Tab_TabSelected;
Initialize(FindViewById(Resource.Id.MainView), CloudAuctionApplication.Instance.MainViewModel);
// This call initializes data binding and updates the view with the current viewmodel values.
for (int position = 0; position < tabs.Length; position++)
{
ActionBar.AddTab(tabs[position], setSelected: (MainViewModel.SubView)position == CurrentSubView);
}
}
private void EnsureCurrentTabIsSelected()
{
int index = (int)CurrentSubView;
if (ActionBar.SelectedNavigationIndex != index)
{
ActionBar.SetSelectedNavigationItem(index);
}
}
protected override void OnResume()
{
base.OnResume();
EnsureCurrentTabIsSelected();
}
private void Tab_TabSelected(object sender, ActionBar.TabEventArgs e)
{
var tab = (ActionBar.Tab)sender;
e.FragmentTransaction.Replace(Resource.Id.MainView_TabFragmentContainer, (Fragment)tab.Tag);
// TODO: Check if we should also use .Remove in TabUnselected event? E.g. see http://arvid-g.de/12/android-4-actionbar-with-tabs-example
CurrentSubView = (MainViewModel.SubView)tab.Position;
}
public override bool OnCreateOptionsMenu(IMenu menu)
{
MenuInflater.Inflate(Resource.Menu.MainMenu, menu);
return base.OnPrepareOptionsMenu(menu);
}
public override bool OnOptionsItemSelected(IMenuItem item)
{
switch (item.ItemId)
{
case Resource.Id.LogoutMenuItem: ViewModel.LogoutCommand.Execute(null); return true;
default: return base.OnOptionsItemSelected(item);
}
}
}
}
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