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using System;
using Xamarin.Forms;
using Xamarin.Forms.CustomAttributes;
using System.Collections.Generic;
using Xamarin.Forms.Internals;
namespace Xamarin.Forms.Controls
{
#if APP
[Preserve (AllMembers = true)]
[Issue (IssueTracker.Github, 2266, "Setting a different Detail page from a MasterDetailPage after 2nd time on MainPage", PlatformAffected.iOS, NavigationBehavior.SetApplicationRoot)]
public class Issue2266 : ContentPage
{
public Issue2266 ()
{
InitPageContent ();
}
void InitPageContent ()
{
var labelHeader = new Label {
Text = "Select a test",
FontSize = 30,
FontAttributes = FontAttributes.Bold,
VerticalOptions = LayoutOptions.Center,
HorizontalOptions = LayoutOptions.CenterAndExpand
};
string[] listItems = {
"MasterDetail Navigation",
"MasterDetail Navigation ->> Page 1",
"MasterDetail Navigation ->> Page 2",
"MasterDetail Navigation ->> Page 3"
};
var listView = new ListView {
ItemsSource = listItems
};
Content = new StackLayout {
Padding = new Thickness (0, 20, 0, 0),
Children = {
labelHeader,
listView
}
};
listView.ItemSelected += delegate(object sender, SelectedItemChangedEventArgs e) {
if (e.SelectedItem == null)
return;
if (e.SelectedItem.Equals (listItems [0])) {
Application.Current.MainPage = MasterDetailHost;
} else if (e.SelectedItem.Equals (listItems [1]) || e.SelectedItem.Equals (listItems [2]) || e.SelectedItem.Equals (listItems [3])) {
// MasterDetail Navigation - direct page open
var item = e.SelectedItem.ToString ();
var index = int.Parse (item.Substring (item.Length - 1)) - 1;
Application.Current.MainPage = MasterDetailHost;
MasterDetailHost.OpenPage (index);
}
listView.SelectedItem = null;
};
}
static MasterDetailNavigation s_masterDetailHost;
public static MasterDetailNavigation MasterDetailHost {
get {
if (s_masterDetailHost == null)
s_masterDetailHost = new MasterDetailNavigation ();
return s_masterDetailHost;
}
}
}
public class MasterDetailNavigation : MasterDetailPage
{
List<NavigationPage> _pages;
public MasterDetailNavigation ()
{
InitPages ();
var menuList = new ListView {
BackgroundColor = Color.Transparent,
ItemsSource = _pages,
ItemTemplate = new DataTemplate (typeof(TextCell))
};
menuList.ItemTemplate.SetBinding (TextCell.TextProperty, "Title");
Master = new ContentPage {
BackgroundColor = Color.FromHex ("363636"),
Title = "Menu",
Content = menuList
};
Detail = new NavigationPage (new ContentPage {
Padding = new Thickness (20, 20),
Content = new StackLayout {
Children = {
new Label { Text = "Select a menu item" }
}
}
});
menuList.ItemSelected += (sender, e) => {
var page = e.SelectedItem as NavigationPage;
if (page != null) {
Detail = page;
IsPresented = false;
}
};
}
void InitPages ()
{
_pages = new List<NavigationPage> ();
for (int i = 1; i <= 10; i++) {
var btnSubPage = new Button {
Text = string.Format ("Open sub-page"),
};
btnSubPage.Clicked += delegate {
OpenSubPage (string.Format ("Sub for page: {0}", i));
};
var page = new ContentPage {
Padding = new Thickness (20, 20),
Title = string.Format ("Page {0}", i),
Content = new StackLayout {
Children = {
new Label { Text = string.Format ("Page {0}", i) },
btnSubPage
}
}
};
page.ToolbarItems.Add (new ToolbarItem ("START", null, delegate {
Application.Current.MainPage = App.MenuPage;
}));
_pages.Add (new NavigationPage (page) { Title = page.Title });
}
}
public void OpenPage (int index)
{
if (index >= _pages.Count) {
// Index out of range
return;
}
Detail = _pages [index];
}
async void OpenSubPage (string text)
{
await Detail.Navigation.PushAsync (new ContentPage {
Content = new Label { Text = text }
});
}
}
#endif
}
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