From c5405183c9aaa1d84a6b62733100058c578394f4 Mon Sep 17 00:00:00 2001
From: Wojtek Figat <wojtek@figat.pl>
Date: Tue, 1 Jun 2021 12:14:04 +0200
Subject: [PATCH] Fix tooltips to be constrained by monitor bounds instead of
 virtual desktop or parent window bounds

#470 #540
---
 Source/Engine/UI/GUI/Tooltip.cs | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/Source/Engine/UI/GUI/Tooltip.cs b/Source/Engine/UI/GUI/Tooltip.cs
index 4541124e7..e6690c82d 100644
--- a/Source/Engine/UI/GUI/Tooltip.cs
+++ b/Source/Engine/UI/GUI/Tooltip.cs
@@ -72,19 +72,17 @@ namespace FlaxEngine.GUI
             Vector2 dpiSize = Size * dpiScale;
             Vector2 locationWS = target.PointToWindow(location);
             Vector2 locationSS = parentWin.PointToScreen(locationWS);
-            Vector2 screenSize = Platform.VirtualDesktopSize;
-            Vector2 parentWinLocationSS = parentWin.PointToScreen(Vector2.Zero);
-            float parentWinRightSS = parentWinLocationSS.Y + parentWin.Size.Y;
-            float parentWinBottomSS = parentWinLocationSS.X + parentWin.Size.X;
+            Rectangle monitorBounds = Platform.GetMonitorBounds(locationSS);
+            Vector2 rightBottomMonitorBounds = monitorBounds.BottomRight;
             Vector2 rightBottomLocationSS = locationSS + dpiSize;
 
             // Prioritize tooltip placement within parent window, fall back to virtual desktop
-            if (parentWinRightSS < rightBottomLocationSS.Y || screenSize.Y < rightBottomLocationSS.Y)
+            if (rightBottomMonitorBounds.Y < rightBottomLocationSS.Y)
             {
                 // Direction: up
                 locationSS.Y -= dpiSize.Y;
             }
-            if (parentWinBottomSS < rightBottomLocationSS.X || screenSize.X < rightBottomLocationSS.X)
+            if (rightBottomMonitorBounds.X < rightBottomLocationSS.X)
             {
                 // Direction: left
                 locationSS.X -= dpiSize.X;