From e20307dcfbd30fbc4f43dfb3626f440a48567416 Mon Sep 17 00:00:00 2001
From: Gabriel de Dietrich <gabriel.dedietrich@qt.io>
Date: Mon, 16 Jul 2018 13:07:38 -0700
Subject: QMacStyle: Configure checkbox NSButton as tri-state

Qt allows this as a property of QCheckBox, so it should
be enabled in its Cocoa counterpart.

Change-Id: I88eb6dddabb173050c4fe7229f15c768181ef527
Task-number: QTBUG-69453
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>
---
 src/plugins/styles/mac/qmacstyle_mac.mm | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'src')

diff --git a/src/plugins/styles/mac/qmacstyle_mac.mm b/src/plugins/styles/mac/qmacstyle_mac.mm
index 2d212bfe3b..45da5fbd84 100644
--- a/src/plugins/styles/mac/qmacstyle_mac.mm
+++ b/src/plugins/styles/mac/qmacstyle_mac.mm
@@ -1837,6 +1837,8 @@ NSView *QMacStylePrivate::cocoaControl(CocoaControl widget) const
         auto *button = static_cast<NSButton *>(bv);
         button.buttonType = buttonType;
         button.bezelStyle = bezelStyle;
+        if (widget.type == Button_CheckBox)
+            button.allowsMixedState = YES;
     }
 
     return bv;
-- 
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