From ba981cd8acb48acf34354c2da4e71ae76661586b Mon Sep 17 00:00:00 2001
From: rabbitism <popmessiah@hotmail.com>
Date: Thu, 19 Dec 2024 21:56:03 +0800
Subject: [PATCH] feat: fix date range start selection when tab into the
 control.

---
 .../DateTimePicker/DateRangePicker.cs         | 29 ++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/src/Ursa/Controls/DateTimePicker/DateRangePicker.cs b/src/Ursa/Controls/DateTimePicker/DateRangePicker.cs
index 157a2f4..775d66b 100644
--- a/src/Ursa/Controls/DateTimePicker/DateRangePicker.cs
+++ b/src/Ursa/Controls/DateTimePicker/DateRangePicker.cs
@@ -457,5 +457,32 @@ public class DateRangePicker : DatePickerBase, IClearControl
                 break;
         }
     }
-    
+
+    protected override void OnGotFocus(GotFocusEventArgs e)
+    {
+        base.OnGotFocus(e);
+        FocusChanged(IsKeyboardFocusWithin);
+    }
+
+    private bool _isFocused;
+    private void FocusChanged(bool hasFocus)
+    {
+        // The OnGotFocus & OnLostFocus are asynchronously and cannot
+        // reliably tell you that have the focus.  All they do is let you
+        // know that the focus changed sometime in the past.  To determine
+        // if you currently have the focus you need to do consult the
+        // FocusManager.
+
+        bool wasFocused = _isFocused;
+        _isFocused = hasFocus;
+
+        if (hasFocus)
+        {
+
+            if (!wasFocused && _start == null)
+            {
+                _start = true;
+            }
+        }
+    }
 }
\ No newline at end of file