QWindowsTheme: Fix the available file icon sizes

Previously, QWindowsTheme had a hardcoded list of of available file icon sizes.
As the sizes depend on the Windows display scale factor, this can lead to
undesired scaling of icons.

Maintain an array of the standard sizes against which the sizes are
matched; refresh in display change.

Task-number: QTBUG-54561
Change-Id: If36de2f30c8a230cc7bd8eeb4dfc9f201aeda5e4
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/plugins/platforms/windows/qwindowstheme.h b/src/plugins/platforms/windows/qwindowstheme.h
index cacde98601..aafcf320aa 100644
--- a/src/plugins/platforms/windows/qwindowstheme.h
+++ b/src/plugins/platforms/windows/qwindowstheme.h
@@ -37,6 +37,8 @@
 #include "qwindowsthreadpoolrunner.h"
 #include <qpa/qplatformtheme.h>
 
+#include <QtCore/QVariant>
+
 QT_BEGIN_NAMESPACE
 
 class QWindow;
@@ -62,6 +64,7 @@ public:
                            QPlatformTheme::IconOptions iconOptions = 0) const Q_DECL_OVERRIDE;
 
     void windowsThemeChanged(QWindow *window);
+    void displayChanged() { refreshIconPixmapSizes(); }
 
     static const char *name;
 
@@ -71,11 +74,13 @@ private:
     void refreshPalettes();
     void clearFonts();
     void refreshFonts();
+    void refreshIconPixmapSizes();
 
     static QWindowsTheme *m_instance;
     QPalette *m_palettes[NPalettes];
     QFont *m_fonts[NFonts];
     mutable QWindowsThreadPoolRunner m_threadPoolRunner;
+    QVariant m_fileIconSizes;
 };
 
 QT_END_NAMESPACE