Dark windows: use background/foreground colors for tooltips

That follows what File Explorer on Windows 11, or the system UI does for
tooltips in modern UI elements (the tooltip for the "minimize" button in
a titlebar still shows the yellow-colored tooltip). Using the accent
color makes the tooltip pop a lot more, but doesn't look native.

Also make the toolTipPalette helper function do something useful in dark
mode.

Pick-to: 6.5
Change-Id: I2b07abd72eee50508f19f46aaec3408183c27100
Reviewed-by: Santhosh Kumar <santhosh.kumar.selvaraj@qt.io>
Reviewed-by: David Schulz <david.schulz@qt.io>

1 files changed, 6 insertions, 7 deletions

diff --git a/src/plugins/platforms/windows/qwindowstheme.cpp b/src/plugins/platforms/windows/qwindowstheme.cpp
index b9d02a4374..6e804c53a0 100644
--- a/src/plugins/platforms/windows/qwindowstheme.cpp
+++ b/src/plugins/platforms/windows/qwindowstheme.cpp
@@ -298,8 +298,8 @@ static void populateDarkSystemBasePalette(QPalette &result)
     result.setColor(QPalette::All, QPalette::Link, linkColor);
     result.setColor(QPalette::All, QPalette::LinkVisited, accentDarkest);
     result.setColor(QPalette::All, QPalette::AlternateBase, accentDarkest);
-    result.setColor(QPalette::All, QPalette::ToolTipBase, accentDarkest);
-    result.setColor(QPalette::All, QPalette::ToolTipText, accentLightest);
+    result.setColor(QPalette::All, QPalette::ToolTipBase, buttonColor);
+    result.setColor(QPalette::All, QPalette::ToolTipText, foreground.darker(120));
     result.setColor(QPalette::All, QPalette::PlaceholderText, placeHolderColor(foreground));
 }
 
@@ -335,12 +335,11 @@ static QPalette systemPalette(bool light)
 
 static inline QPalette toolTipPalette(const QPalette &systemPalette, bool light)
 {
-    if (!light)
-        return systemPalette;
-
     QPalette result(systemPalette);
-    const QColor tipBgColor = getSysColor(COLOR_INFOBK);
-    const QColor tipTextColor = getSysColor(COLOR_INFOTEXT);
+    const QColor tipBgColor = light ? getSysColor(COLOR_INFOBK)
+                                    : systemPalette.button().color();
+    const QColor tipTextColor = light ? getSysColor(COLOR_INFOTEXT)
+                                      : systemPalette.buttonText().color().darker(120);
 
     result.setColor(QPalette::All, QPalette::Button, tipBgColor);
     result.setColor(QPalette::All, QPalette::Window, tipBgColor);