avlaonia: Added clicking on empty squares in calendar

InABox.Avalonia/Components/CalendarView/CalendarView.axaml.cs

@@ -14,6 +14,12 @@ using System.Runtime.Serialization;
 
 namespace InABox.Avalonia.Components;
 
+public class CalendarBlockEventArgs(TimeSpan start, TimeSpan end) : EventArgs
+{
+    public TimeSpan Start { get; set; } = start;
+    public TimeSpan End { get; set; } = end;
+}
+
 public partial class CalendarView : UserControl
 {
     public static readonly StyledProperty<double> RowHeightProperty = 
@@ -104,6 +110,9 @@ public partial class CalendarView : UserControl
         set => SetValue(HeaderTemplateProperty, value);
     }
 
+    public event EventHandler<CalendarBlockEventArgs>? EmptyBlockClicked;
+    public event EventHandler<CalendarBlockEventArgs>? EmptyBlockHeld;
+
     static CalendarView()
     {
         ItemsSourceProperty.Changed.AddClassHandler<CalendarView>(ItemsSource_Changed);
@@ -230,6 +239,8 @@ public partial class CalendarView : UserControl
             _oldSubscriptions.Add(block.GetObservable(Block.ColumnProperty).Skip(1).Subscribe(x => Render(itemsChanged: true)));
             _oldSubscriptions.Add(block.GetObservable(Block.StartTimeProperty).Skip(1).Subscribe(x => UpdateBlock(block)));
             _oldSubscriptions.Add(block.GetObservable(Block.EndTimeProperty).Skip(1).Subscribe(x => UpdateBlock(block)));
+            block.PointerPressed += Block_PointerPressed;
+            block.Background = new SolidColorBrush(Colors.Transparent);
 
             var column = block.Column;
             if(column is null)
@@ -240,6 +251,11 @@ public partial class CalendarView : UserControl
         }
     }
 
+    private void Block_PointerPressed(object? sender, global::Avalonia.Input.PointerPressedEventArgs e)
+    {
+        e.Handled = true;
+    }
+
     private void Render(bool itemsChanged = false, bool recalculatePositions = false)
     {
         if (itemsChanged)
@@ -292,6 +308,42 @@ public partial class CalendarView : UserControl
 
             foreach(var column in columnBlocks.Columns!)
             {
+                for(int j = 0; j < Math.Ceiling(nRows); ++j)
+                {
+                    var backgroundBlock = new Border
+                    {
+                        Width = colWidth,
+                        Height = rowHeight,
+                        Background = new SolidColorBrush(Colors.Transparent)
+                    };
+                    var start = RowInterval * j;
+                    var end = RowInterval * (j + 1);
+                    if(end.TotalHours >= 24)
+                    {
+                        end = TimeSpan.FromHours(24).Subtract(TimeSpan.FromTicks(1));
+                    }
+                    CancellationTokenSource? cts = null;
+                    backgroundBlock.PointerPressed += (o, e) =>
+                    {
+                        cts = new();
+                        Task.Delay(1000).ContinueWith(task =>
+                        {
+                            cts = null;
+                            EmptyBlockHeld?.Invoke(this, new(start, end));
+                        }, cts.Token, TaskContinuationOptions.None, TaskScheduler.FromCurrentSynchronizationContext());
+                    };
+                    backgroundBlock.PointerReleased += (o, e) =>
+                    {
+                        if(cts is not null)
+                        {
+                            cts.Cancel();
+                            EmptyBlockClicked?.Invoke(this, new(start, end));
+                        }
+                    };
+                    Canvas.SetLeft(backgroundBlock, colX);
+                    Canvas.SetTop(backgroundBlock, j * rowHeight);
+                    Canvas.Children.Add(backgroundBlock);
+                }
                 foreach(var block in column)
                 {
                     Canvas.SetTop(block, GetRow(block.StartTime) * rowHeight);