From be64576a75d599cd1f15a12599a3126bdef9f8e4 Mon Sep 17 00:00:00 2001
From: Wolf-SO <peu@rekoba.de>
Date: Sat, 4 Mar 2023 14:39:47 +0100
Subject: [PATCH] Prevent calendar out of screen. Fixes #100

If calendar goes out of screen on drop_down, adjust position.
(@todo take taskbar/dock area into account)
---
 tkcalendar/dateentry.py | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/tkcalendar/dateentry.py b/tkcalendar/dateentry.py
index e6d782e..082aa2c 100644
--- a/tkcalendar/dateentry.py
+++ b/tkcalendar/dateentry.py
@@ -331,6 +331,22 @@ def drop_down(self):
             date = self.parse_date(self.get())
             x = self.winfo_rootx()
             y = self.winfo_rooty() + self.winfo_height()
+            
+            # Adjust position if calendar toplevel goes out of screen.
+            # The screen area occupied by the taskbar/dock 
+            # is currently not taken into account.
+            xmin = 0
+            xmax = self.winfo_screenwidth()
+            ymax = self.winfo_screenheight()
+            width = self._top_cal.winfo_width()
+            height = self._top_cal.winfo_height()
+            if y+height >= ymax:
+                y = self.winfo_rooty()-height;
+            if x+width >= xmax:
+                x = xmax-width;
+            elif x < xmin:
+                x = xmin
+            
             if self.winfo_toplevel().attributes('-topmost'):
                 self._top_cal.attributes('-topmost', True)
             else: