From f832c707caaa24528eb3048280576144eb13cda4 Mon Sep 17 00:00:00 2001
From: Ilya Fedin <fedin-ilja2010@ya.ru>
Date: Sat, 20 Aug 2022 19:00:33 +0400
Subject: QGtk3Theme: subscribe to theme hint changes
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Pick-to: 6.4
Change-Id: I67a9a0d06e88384c0bb6f5008609bcfbf504705f
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
---
 src/plugins/platformthemes/gtk3/qgtk3theme.cpp | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

(limited to 'src/plugins/platformthemes')

diff --git a/src/plugins/platformthemes/gtk3/qgtk3theme.cpp b/src/plugins/platformthemes/gtk3/qgtk3theme.cpp
index 44d9db8530..ab607a0c6d 100644
--- a/src/plugins/platformthemes/gtk3/qgtk3theme.cpp
+++ b/src/plugins/platformthemes/gtk3/qgtk3theme.cpp
@@ -7,6 +7,7 @@
 #include <QVariant>
 #include <QtCore/qregularexpression.h>
 #include <QGuiApplication>
+#include <qpa/qwindowsysteminterface.h>
 
 #undef signals
 #include <gtk/gtk.h>
@@ -82,6 +83,25 @@ QGtk3Theme::QGtk3Theme()
 
     /* Use our custom log handler. */
     g_log_set_handler("Gtk", G_LOG_LEVEL_MESSAGE, gtkMessageHandler, nullptr);
+
+#define SETTING_CONNECT(setting) g_signal_connect(settings, "notify::" setting, G_CALLBACK(notifyThemeChanged), nullptr)
+    auto notifyThemeChanged = [] {
+        QWindowSystemInterface::handleThemeChange();
+    };
+
+    GtkSettings *settings = gtk_settings_get_default();
+    SETTING_CONNECT("gtk-cursor-blink-time");
+    SETTING_CONNECT("gtk-double-click-distance");
+    SETTING_CONNECT("gtk-double-click-time");
+    SETTING_CONNECT("gtk-long-press-time");
+    SETTING_CONNECT("gtk-entry-password-hint-timeout");
+    SETTING_CONNECT("gtk-dnd-drag-threshold");
+    SETTING_CONNECT("gtk-icon-theme-name");
+    SETTING_CONNECT("gtk-fallback-icon-theme");
+    SETTING_CONNECT("gtk-font-name");
+    SETTING_CONNECT("gtk-application-prefer-dark-theme");
+    SETTING_CONNECT("gtk-theme-name");
+#undef SETTING_CONNECT
 }
 
 static inline QVariant gtkGetLongPressTime()
-- 
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