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using System;
using System.Collections.ObjectModel;
using System.Threading.Tasks;
namespace Xamarin.Forms.Controls
{
internal class TemplatedCarouselGallery
: CarouselPage
{
ObservableCollection<Item> _items;
int _count = 0;
public TemplatedCarouselGallery()
{
NavigationPage.SetHasNavigationBar (this, false);
_items = new ObservableCollection<Item> {
CreateItem(),
CreateItem(),
};
ItemsSource = _items;
ItemTemplate = new DataTemplate (() => {
var page = new ContentPage ();
page.Padding = new Thickness (0,30,0,0);
page.SetBinding (TitleProperty, "Title");
var layout = new StackLayout { Spacing = 0 };
var label = new Label();
label.SetBinding (Label.TextProperty, "Content");
layout.Children.Add (label);
var swipeHereLabel = new Label {
Text = "Swipe Here",
HeightRequest = 40
};
layout.Children.Add (swipeHereLabel);
var add = new Button ();
add.SetBinding (Button.TextProperty, "InsertTabText");
add.Clicked += (sender, args) => _items.Insert (_items.IndexOf ((Item)add.BindingContext) + 1, CreateItem());
layout.Children.Add (add);
var change = new Button ();
change.SetBinding (Button.TextProperty, "ChangeTitleText");
change.Clicked += (sender, args) => ((Item) change.BindingContext).Title = (new Random().Next().ToString());
layout.Children.Add (change);
var remove = new Button ();
remove.SetBinding (Button.TextProperty, "RemoveTabText");
remove.Clicked += (sender, args) => _items.Remove ((Item)remove.BindingContext);
layout.Children.Add (remove);
var reset = new Button ();
reset.SetBinding (Button.TextProperty, "ResetAllTabsText");
reset.Clicked += (sender, args) => {
_count = 0;
ItemsSource = _items = new ObservableCollection<Item> { CreateItem(), CreateItem() };
};
layout.Children.Add (reset);
var nextPage = new Button ();
nextPage.SetBinding (Button.TextProperty, "NextPageText");
nextPage.Clicked += (sender, args) => {
int index = _items.IndexOf ((Item) nextPage.BindingContext) + 1;
if (index == _items.Count)
index = 0;
SelectedItem = _items[index];
};
layout.Children.Add (nextPage);
var delayReset = new Button { Text = "Delayed reset" };
delayReset.SetBinding (Button.TextProperty, "DelayedResetText");
delayReset.Clicked += (sender, args) => {
ItemsSource = null;
Task.Delay (5000).ContinueWith (t => {
_count = 0;
ItemsSource = _items = new ObservableCollection<Item> { CreateItem(), CreateItem() };
}, TaskScheduler.FromCurrentSynchronizationContext());
};
layout.Children.Add (delayReset);
page.Content = new ScrollView {
Padding = new Thickness (60, 0),
Content = layout
};
return page;
});
}
Item CreateItem()
{
int x = _count++;
return new Item {
Title = "Page " + x,
Content = "Lorem ipsum dolor sit amet #" + x,
InsertTabText = "Insert Tab: " + x,
ChangeTitleText = "Change title: " + x,
MoveTabText = "Move Tab: " + x,
RemoveTabText = "Remove Tab: " + x,
ResetAllTabsText = "Reset all tabs: " + x,
NextPageText = "Next Page: " + x,
DelayedResetText = "Delayed reset: " + x
};
}
}
}
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