1- using Xamarin . Plugin . Calendar . Models ;
1+ using SampleApp . Model ;
22using System ;
33using System . Collections . Generic ;
4+ using System . Collections . ObjectModel ;
45using System . Globalization ;
5- using System . Threading . Tasks ;
66using System . Linq ;
7- using System . Collections . ObjectModel ;
7+ using System . Threading . Tasks ;
88using System . Windows . Input ;
99using Xamarin . Forms ;
10- using SampleApp . Model ;
10+ using Xamarin . Plugin . Calendar . Enums ;
11+ using Xamarin . Plugin . Calendar . Models ;
1112
1213namespace SampleApp . ViewModels
1314{
1415 public class AdvancedPageViewModel : BasePageViewModel
1516 {
1617 public ICommand DayTappedCommand => new Command < DateTime > ( async ( date ) => await DayTapped ( date ) ) ;
17- public ICommand SwipeLeftCommand => new Command ( ( ) => { MonthYear = MonthYear . AddMonths ( 2 ) ; } ) ;
18- public ICommand SwipeRightCommand => new Command ( ( ) => { MonthYear = MonthYear . AddMonths ( - 2 ) ; } ) ;
19- public ICommand SwipeUpCommand => new Command ( ( ) => { MonthYear = DateTime . Today ; } ) ;
18+ public ICommand SwipeLeftCommand => new Command ( ( ) => ChangeShownUnit ( 1 ) ) ;
19+ public ICommand SwipeRightCommand => new Command ( ( ) => ChangeShownUnit ( - 1 ) ) ;
20+ public ICommand SwipeUpCommand => new Command ( ( ) => { ShownDate = DateTime . Today ; } ) ;
2021
2122 public ICommand EventSelectedCommand => new Command ( async ( item ) => await ExecuteEventSelectedCommand ( item ) ) ;
2223
2324 public AdvancedPageViewModel ( ) : base ( )
2425 {
26+ Device . BeginInvokeOnMainThread ( async ( ) => await App . Current . MainPage . DisplayAlert ( "Info" , "Loading events with delay, and changeing current view." , "Ok" ) ) ;
27+
2528 Culture = CultureInfo . CreateSpecificCulture ( "en-GB" ) ;
2629 // testing all kinds of adding events
2730 // when initializing collection
@@ -46,36 +49,34 @@ public AdvancedPageViewModel() : base()
4649 // with indexer
4750 Events [ DateTime . Now ] = new List < AdvancedEventModel > ( GenerateEvents ( 2 , "Boring" ) ) ;
4851
49- MonthYear = MonthYear . AddMonths ( 1 ) ;
50-
51- Task . Delay ( 5000 ) . ContinueWith ( _ =>
52- {
53- // indexer - update later
54- Events [ DateTime . Now ] = new ObservableCollection < AdvancedEventModel > ( GenerateEvents ( 10 , "Cool" ) ) ;
55-
56- // add later
57- Events . Add ( DateTime . Now . AddDays ( 3 ) , new List < AdvancedEventModel > ( GenerateEvents ( 5 , "Cool" ) ) ) ;
52+ ShownDate = ShownDate . AddMonths ( 1 ) ;
5853
59- // indexer later
60- Events [ DateTime . Now . AddDays ( 10 ) ] = new List < AdvancedEventModel > ( GenerateEvents ( 10 , "Boring" ) ) ;
54+ Task . Delay ( 5000 ) . ContinueWith ( _ =>
55+ {
56+ // indexer - update later
57+ Events [ DateTime . Now ] = new ObservableCollection < AdvancedEventModel > ( GenerateEvents ( 10 , "Cool" ) ) ;
6158
62- // add later
63- Events . Add ( DateTime . Now . AddDays ( 15 ) , new List < AdvancedEventModel > ( GenerateEvents ( 10 , "Cool" ) ) ) ;
59+ // add later
60+ Events . Add ( DateTime . Now . AddDays ( 3 ) , new List < AdvancedEventModel > ( GenerateEvents ( 5 , "Cool" ) ) ) ;
6461
62+ // indexer later
63+ Events [ DateTime . Now . AddDays ( 10 ) ] = new List < AdvancedEventModel > ( GenerateEvents ( 10 , "Boring" ) ) ;
6564
66- Task . Delay ( 3000 ) . ContinueWith ( t =>
67- {
68- MonthYear = MonthYear . AddMonths ( - 2 ) ;
65+ // add later
66+ Events . Add ( DateTime . Now . AddDays ( 15 ) , new List < AdvancedEventModel > ( GenerateEvents ( 10 , "Cool" ) ) ) ;
6967
70- // get observable collection later
71- var todayEvents = Events [ DateTime . Now ] as ObservableCollection < AdvancedEventModel > ;
68+ Task . Delay ( 3000 ) . ContinueWith ( t =>
69+ {
70+ ShownDate = ShownDate . AddMonths ( - 2 ) ;
7271
73- // insert/add items to observable collection
74- todayEvents . Insert ( 0 , new AdvancedEventModel { Name = "Cool event insert" , Description = "This is Cool event's description!" , Starting = new DateTime ( ) } ) ;
75- todayEvents . Add ( new AdvancedEventModel { Name = "Cool event add" , Description = "This is Cool event's description!" , Starting = new DateTime ( ) } ) ;
72+ // get observable collection later
73+ var todayEvents = Events [ DateTime . Now ] as ObservableCollection < AdvancedEventModel > ;
7674
77- } , TaskScheduler . FromCurrentSynchronizationContext ( ) ) ;
78- } , TaskScheduler . FromCurrentSynchronizationContext ( ) ) ;
75+ // insert/add items to observable collection
76+ todayEvents . Insert ( 0 , new AdvancedEventModel { Name = "Cool event insert" , Description = "This is Cool event's description!" , Starting = new DateTime ( ) } ) ;
77+ todayEvents . Add ( new AdvancedEventModel { Name = "Cool event add" , Description = "This is Cool event's description!" , Starting = new DateTime ( ) } ) ;
78+ } , TaskScheduler . FromCurrentSynchronizationContext ( ) ) ;
79+ } , TaskScheduler . FromCurrentSynchronizationContext ( ) ) ;
7980
8081 SelectedDate = DateTime . Today . AddDays ( 10 ) ;
8182 }
@@ -92,22 +93,32 @@ private IEnumerable<AdvancedEventModel> GenerateEvents(int count, string name)
9293
9394 public EventCollection Events { get ; }
9495
95- private DateTime _monthYear = DateTime . Today ;
96- public DateTime MonthYear
96+ private DateTime _shownDate = DateTime . Today ;
97+
98+ public DateTime ShownDate
99+ {
100+ get => _shownDate ;
101+ set => SetProperty ( ref _shownDate , value ) ;
102+ }
103+
104+ private WeekLayout _calendarLayout = WeekLayout . Month ;
105+
106+ public WeekLayout CalendarLayout
97107 {
98- get => _monthYear ;
99- set => SetProperty ( ref _monthYear , value ) ;
108+ get => _calendarLayout ;
109+ set => SetProperty ( ref _calendarLayout , value ) ;
100110 }
101111
102112 private DateTime ? _selectedDate = DateTime . Today ;
113+
103114 public DateTime ? SelectedDate
104115 {
105116 get => _selectedDate ;
106117 set => SetProperty ( ref _selectedDate , value ) ;
107118 }
108119
109-
110120 private CultureInfo _culture = CultureInfo . InvariantCulture ;
121+
111122 public CultureInfo Culture
112123 {
113124 get => _culture ;
@@ -129,5 +140,31 @@ private async Task ExecuteEventSelectedCommand(object item)
129140 await App . Current . MainPage . DisplayAlert ( title , message , "Ok" ) ;
130141 }
131142 }
143+
144+ private void ChangeShownUnit ( int amountToAdd )
145+ {
146+ switch ( CalendarLayout )
147+ {
148+ case WeekLayout . Week :
149+ case WeekLayout . TwoWeek :
150+ ChangeShownWeek ( amountToAdd ) ;
151+ break ;
152+
153+ case WeekLayout . Month :
154+ default :
155+ ChangeShownMonth ( amountToAdd ) ;
156+ break ;
157+ }
158+ }
159+
160+ private void ChangeShownMonth ( int monthsToAdd )
161+ {
162+ ShownDate . AddMonths ( monthsToAdd ) ;
163+ }
164+
165+ private void ChangeShownWeek ( int weeksToAdd )
166+ {
167+ ShownDate . AddDays ( weeksToAdd * 7 ) ;
168+ }
132169 }
133170}
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