Merge pull request #265 from irihitech/calendar

CalendarView and DatePicker and DateRangePicker

demo/Ursa.Demo/Pages/DatePickerDemo.axaml

@@ -0,0 +1,14 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             xmlns:u="https://irihi.tech/ursa"
+             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+             x:Class="Ursa.Demo.Pages.DatePickerDemo">
+    <StackPanel Margin="20" HorizontalAlignment="Left">
+        <u:CalendarView DateSelected="CalendarView_OnOnDateSelected" DatePreviewed="CalendarView_OnOnDatePreviewed"/>
+        <TextBlock Text="{Binding #singlePicker.SelectedDate}" ></TextBlock>
+        <u:DatePicker Name="singlePicker" Width="200"  />
+        <u:DateRangePicker Width="300" DisplayFormat="yyyyMMdd" />
+    </StackPanel>
+</UserControl>

demo/Ursa.Demo/Pages/DatePickerDemo.axaml.cs

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+using System.Diagnostics;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+using Ursa.Controls;
+
+namespace Ursa.Demo.Pages;
+
+public partial class DatePickerDemo : UserControl
+{
+    public DatePickerDemo()
+    {
+        InitializeComponent();
+    }
+
+    private void CalendarView_OnOnDateSelected(object? sender, CalendarDayButtonEventArgs e)
+    {
+        Debug.WriteLine("Pressed: "+ e.Date?.ToLongDateString());
+    }
+
+    private void CalendarView_OnOnDatePreviewed(object? sender, CalendarDayButtonEventArgs e)
+    {
+        Debug.WriteLine("Hovered: "+e.Date?.ToLongDateString());
+    }
+}