using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Documents;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Markup;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Media.Animation;

// The Templated Control item template is documented at https://go.microsoft.com/fwlink/?LinkId=234235

namespace FileManager_UWP.Controls {

    public class LabelListControl: ItemsControl {

        //private int _collpse_distance = 22;
        //private List<int> _expanded_position = new List<int>();
        private Storyboard _collpse_story_board = new Storyboard();
        private Storyboard _expand_story_board = new Storyboard();
        private Duration _animate_during = new Duration(TimeSpan.FromMilliseconds(500));

        private ResourceDictionary genericResourceDictionary;
        public LabelListControl() {
            this.DefaultStyleKey = typeof(LabelListControl);
            var uri = new Uri("ms-appx:///Controls/LabelListControl.xaml");
            genericResourceDictionary = new ResourceDictionary();
            Application.LoadComponent(genericResourceDictionary, uri);
        }

        private void ItemsSource_CollectionChanged(object sender, 
            System.Collections.Specialized.NotifyCollectionChangedEventArgs e) {
            update();
        }

        private void update() {
            TextBlock textBlock = (TextBlock)GetTemplateChild("LabelTextBlock");
            textBlock.Text = "测试自定义控件\n";
            //listView.ItemsSource = ItemsSource;
            var itemsSource = ItemsSource as ObservableCollection<string>;
            textBlock.Text += itemsSource.Count().ToString();

            Canvas labelListCanvas = (Canvas)GetTemplateChild("LabelListCanvas");
            //labelListCanvas.Children.Count;
            labelListCanvas.Children.Clear();
            _collpse_story_board.Children.Clear();
            _expand_story_board.Children.Clear();
            int expanded_position = 0;
            foreach (string label in itemsSource) {
                Button b = new Button();
                b.Content = label;
                //b.SetValue(Canvas.LeftProperty, labelListCanvas.Children.Count * _collpse_distance);
                //b.Style = (Style)Application.Current.Resources["LabelButtonStyle"];
                b.SetValue(Canvas.LeftProperty, expanded_position);
                b.Style = (Style)genericResourceDictionary["LabelButtonStyle"];

                DoubleAnimation collpse_animate = new DoubleAnimation();
                collpse_animate.From = labelListCanvas.Children.Count * 22;
                collpse_animate.To = expanded_position;
                collpse_animate.Duration = _animate_during;
                _collpse_story_board.Children.Add(collpse_animate);
                Storyboard.SetTarget(collpse_animate, b);
                Storyboard.SetTargetProperty(collpse_animate, "(Canvas.Left)");

                DoubleAnimation expand_animate = new DoubleAnimation();
                expand_animate.From = collpse_animate.To;
                expand_animate.To = collpse_animate.From;
                expand_animate.Duration = _animate_during;
                _expand_story_board.Children.Add(expand_animate);
                Storyboard.SetTarget(expand_animate, b);
                Storyboard.SetTargetProperty(expand_animate, "(Canvas.Left)");

                expanded_position += label.Count() * 14 + 20;
                labelListCanvas.Children.Add(b);
            }
        }

        private void init() {
            var itemsSource = ItemsSource as ObservableCollection<string>;
            itemsSource.CollectionChanged += ItemsSource_CollectionChanged;
            TextBlock textBlock = (TextBlock)GetTemplateChild("LabelTextBlock");
            textBlock.Text = "测试自定义控件\nINIT";
        }

        protected override void OnApplyTemplate() {
            init();
            update();
        }

        protected override void OnPointerEntered(PointerRoutedEventArgs e) {
            base.OnPointerEntered(e);
            _collpse_story_board.Begin();
        }

        protected override void OnPointerExited(PointerRoutedEventArgs e) {
            base.OnPointerExited(e);
            _expand_story_board.Begin();
        }
    }
}