feat: WIP retire MonthView and YearView.
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rabbitism
275
src/Ursa/Controls/DateTimePicker/CalendarView.cs
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275
src/Ursa/Controls/DateTimePicker/CalendarView.cs
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using System.Globalization;
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using System.Reflection;
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using Avalonia;
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using Avalonia.Collections;
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using Avalonia.Controls;
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using Avalonia.Controls.Metadata;
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using Avalonia.Controls.Primitives;
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using Avalonia.Interactivity;
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using Avalonia.Layout;
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using Avalonia.Media.TextFormatting;
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using Irihi.Avalonia.Shared.Helpers;
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namespace Ursa.Controls;
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[TemplatePart(PART_NextYearButton, typeof(Button))]
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[TemplatePart(PART_PreviousYearButton, typeof(Button))]
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[TemplatePart(PART_NextButton, typeof(Button))]
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[TemplatePart(PART_PreviousButton, typeof(Button))]
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[TemplatePart(PART_YearButton, typeof(Button))]
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[TemplatePart(PART_MonthButton, typeof(Button))]
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[TemplatePart(PART_HeaderButton, typeof(Button))]
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[TemplatePart(PART_MonthView, typeof(CalendarMonthView))]
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[TemplatePart(PART_YearView, typeof(CalendarYearView))]
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[TemplatePart(PART_MonthGrid, typeof(Grid))]
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[TemplatePart(PART_YearGrid, typeof(Grid))]
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public class CalendarView: TemplatedControl
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{
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public const string PART_NextYearButton = "PART_NextYearButton";
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public const string PART_PreviousYearButton = "PART_PreviousYearButton";
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public const string PART_NextButton = "PART_NextButton";
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public const string PART_PreviousButton = "PART_PreviousButton";
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public const string PART_YearButton = "PART_YearButton";
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public const string PART_MonthButton = "PART_MonthButton";
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public const string PART_MonthView = "PART_MonthView";
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public const string PART_YearView = "PART_YearView";
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public const string PART_HeaderButton = "PART_HeaderButton";
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public const string PART_MonthGrid = "PART_MonthGrid";
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public const string PART_YearGrid = "PART_YearGried";
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private const string ShortestDayName = "ShortestDayName";
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private readonly System.Globalization.Calendar _calendar = new GregorianCalendar();
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internal CalendarViewMode Mode;
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//private CalendarMonthView? _monthView;
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//private CalendarYearView? _yearView;
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private Grid? _monthGrid;
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private Grid? _yearGrid;
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// Year button only shows the year in month mode.
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private Button? _yearButton;
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// Month button only shows the month in month mode.
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private Button? _monthButton;
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// Header button shows year in year mode, and year range in higher mode.
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private Button? _headerButton;
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public DateContext ContextDate { get; set; } = new DateContext();
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public event EventHandler<CalendarDayButtonEventArgs>? OnDateSelected;
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public event EventHandler<CalendarDayButtonEventArgs>? OnDatePreviewed;
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public static readonly StyledProperty<bool> IsTodayHighlightedProperty =
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DatePickerBase.IsTodayHighlightedProperty.AddOwner<CalendarView>();
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public bool IsTodayHighlighted
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{
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get => GetValue(IsTodayHighlightedProperty);
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set => SetValue(IsTodayHighlightedProperty, value);
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}
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public static readonly StyledProperty<DayOfWeek> FirstDayOfWeekProperty =
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DatePickerBase.FirstDayOfWeekProperty.AddOwner<CalendarView>();
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public DayOfWeek FirstDayOfWeek
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{
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get => GetValue(FirstDayOfWeekProperty);
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set => SetValue(FirstDayOfWeekProperty, value);
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}
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protected override void OnApplyTemplate(TemplateAppliedEventArgs e)
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{
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base.OnApplyTemplate(e);
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Button.ClickEvent.RemoveHandler(OnHeaderYearButtonClick, _yearButton);
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Button.ClickEvent.RemoveHandler(OnHeaderMonthButtonClick, _monthButton);
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Button.ClickEvent.RemoveHandler(OnHeaderButtonClick, _headerButton);
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_monthGrid = e.NameScope.Find<Grid>(PART_MonthGrid);
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_yearGrid = e.NameScope.Find<Grid>(PART_YearGrid);
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_yearButton = e.NameScope.Find<Button>(PART_YearButton);
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_monthButton = e.NameScope.Find<Button>(PART_MonthButton);
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_headerButton = e.NameScope.Find<Button>(PART_HeaderButton);
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Button.ClickEvent.AddHandler(OnHeaderYearButtonClick, _yearButton);
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Button.ClickEvent.AddHandler(OnHeaderMonthButtonClick, _monthButton);
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Button.ClickEvent.AddHandler(OnHeaderButtonClick, _headerButton);
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GenerateGridElements();
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}
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/// <summary>
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/// Rule:
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/// </summary>
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/// <param name="sender"></param>
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/// <param name="e"></param>
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private void OnHeaderButtonClick(object sender, RoutedEventArgs e)
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{
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if (Mode == CalendarViewMode.Month)
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{
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throw new NotImplementedException();
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}
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if (Mode == CalendarViewMode.Year)
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{
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}
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}
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/// <summary>
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/// Generate Buttons and labels for MonthView.
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/// Generate Buttons for YearView.
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/// </summary>
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private void GenerateGridElements()
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{
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// Generate Day titles (Sun, Mon, Tue, Wed, Thu, Fri, Sat) based on FirstDayOfWeek and culture.
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var count = 7 + 7 * 7;
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var children = new List<Control>(count);
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var dayOfWeek = (int)FirstDayOfWeek;
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var info = DateTimeHelper.GetCurrentDateTimeFormatInfo();
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for (var i = 0; i < 7; i++)
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{
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var d = (dayOfWeek + i) % DateTimeHelper.NumberOfDaysPerWeek;
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var cell = new TextBlock { Text = info.ShortestDayNames[d], Tag = ShortestDayName };
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cell.SetValue(HorizontalAlignmentProperty, HorizontalAlignment.Center);
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cell.SetValue(Grid.RowProperty, 0);
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cell.SetValue(Grid.ColumnProperty, i);
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children.Add(cell);
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}
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// Generate day buttons.
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for (var i = 2; i < DateTimeHelper.NumberOfWeeksPerMonth + 2; i++)
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for (var j = 0; j < DateTimeHelper.NumberOfDaysPerWeek; j++)
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{
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var cell = new CalendarDayButton();
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cell.SetValue(Grid.RowProperty, i);
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cell.SetValue(Grid.ColumnProperty, j);
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cell.AddHandler(CalendarDayButton.DateSelectedEvent, OnCellDateSelected);
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cell.AddHandler(CalendarDayButton.DatePreviewedEvent, OnCellDatePreviewed);
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children.Add(cell);
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}
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_monthGrid?.Children.AddRange(children);
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// Generate month/year buttons.
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for (var i = 0; i < 12; i++)
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{
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var button = new CalendarYearButton();
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Grid.SetRow(button, i / 3);
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Grid.SetColumn(button, i % 3);
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button.AddHandler(CalendarYearButton.ItemSelectedEvent, OnYearItemSelected);
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_yearGrid?.Children.Add(button);
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}
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}
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private void RefreshButtons(DateTime date)
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{
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if (_monthGrid is null) return;
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var children = _monthGrid.Children;
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var info = DateTimeHelper.GetCurrentDateTimeFormatInfo();
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var dayBefore = PreviousMonthDays(date);
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var dateToSet = date.GetFirstDayOfMonth().AddDays(-dayBefore);
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for (var i = 8; i < children.Count; i++)
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{
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var day = dateToSet;
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var cell = children[i] as CalendarDayButton;
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if (cell is null) continue;
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cell.DataContext = day;
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cell.IsToday = day == DateTime.Today;
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cell.Content = day.Day.ToString(info);
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dateToSet = dateToSet.AddDays(1);
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}
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FadeOutDayButtons();
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}
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private void FadeOutDayButtons()
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{
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if (_monthGrid is null) return;
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var children = _monthGrid.Children;
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for (var i = 8; i < children.Count; i++)
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if (children[i] is CalendarDayButton { DataContext: DateTime d } button && d.Month != ContextDate.Month)
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button.IsNotCurrentMonth = true;
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}
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private int PreviousMonthDays(DateTime date)
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{
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var firstDay = date.GetFirstDayOfMonth();
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var dayOfWeek = _calendar.GetDayOfWeek(firstDay);
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var firstDayOfWeek = FirstDayOfWeek;
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var i = (dayOfWeek - firstDayOfWeek + DateTimeHelper.NumberOfDaysPerWeek) % DateTimeHelper.NumberOfDaysPerWeek;
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return i == 0 ? DateTimeHelper.NumberOfDaysPerWeek : i;
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}
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private void OnCellDatePreviewed(object sender, CalendarDayButtonEventArgs e)
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{
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OnDatePreviewed?.Invoke(sender, e);
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}
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private void OnCellDateSelected(object sender, CalendarDayButtonEventArgs e)
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{
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OnDateSelected?.Invoke(sender, e);
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}
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/// <summary>
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/// Click on Month Header button. Calendar switch from month mode to year mode.
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/// </summary>
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/// <param name="sender"></param>
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/// <param name="e"></param>
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private void OnHeaderMonthButtonClick(object sender, RoutedEventArgs e)
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{
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_headerButton?.SetValue(ContentControl.ContentProperty, ContextDate.Year);
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Mode = CalendarViewMode.Year;
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IsVisibleProperty.SetValue(true, _yearGrid);
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IsVisibleProperty.SetValue(false, _monthGrid);
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}
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/// <summary>
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/// Click on Year Header button. Calendar switch from month mode to decade mode.
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/// </summary>
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/// <param name="sender"></param>
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/// <param name="e"></param>
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private void OnHeaderYearButtonClick(object sender, RoutedEventArgs e)
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{
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if (_yearGrid is null) return;
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int? decadeStart = ContextDate.Year / 10 * 10;
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_headerButton?.SetValue(ContentControl.ContentProperty,
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decadeStart + "-" + (decadeStart + 10));
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Mode = CalendarViewMode.Decade;
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IsVisibleProperty.SetValue(true, _yearGrid);
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IsVisibleProperty.SetValue(false, _monthGrid);
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}
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private void OnYearItemSelected(object sender, CalendarYearButtonEventArgs e)
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{
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if (_yearGrid is null) return;
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var buttons = _yearGrid.Children.OfType<CalendarYearButton>().ToList();
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if (e.Mode == CalendarViewMode.Year)
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{
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if (e.Month is null) return;
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var day = MathHelpers.SafeClamp(e.Month.Value, 0,
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DateTime.DaysInMonth(ContextDate.Year!.Value, e.Month.Value + 1));
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ContextDate = new DateContext { Year = ContextDate.Year, Month = e.Month + 1, Day = day };
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Mode = CalendarViewMode.Month;
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}
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else if (e.Mode == CalendarViewMode.Decade)
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{
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// Set CalendarYearView to Month mode
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for (var i = 0; i < 12; i++)
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{
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buttons[i].SetValues(CalendarViewMode.Month, month: i);
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}
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ContextDate = new DateContext() { Year = e.Year!.Value, Month = ContextDate.Month, Day = null };
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Mode = CalendarViewMode.Month;
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}
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else if (e.Mode == CalendarViewMode.Century)
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{
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// Set CalendarYearView to Year mode
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for (var i = 0; i < 12; i++)
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{
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if (e.StartYear is null || e.EndYear is null) continue;
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var year = e.StartYear.Value - 1 + i;
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buttons[i].SetValues(CalendarViewMode.Year, year: year);
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}
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Mode = CalendarViewMode.Year;
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}
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}
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}
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