Add fonts to QPlatformTheme.

- Remove QPlatformFontDatabase::defaultFonts() returning
  a hash containing widget name ->font and the Windows
  implementation.
- Add enumeration and font accessor to QPlatformTheme. The value
  returned for the enumeration value overwrites the default font
  of the font database.
- Implement for Windows, Mac and KDE.
- Add more Windows palettes.

Task-number: QTBUG-23686

Change-Id: I8a2abdfd216df23daa7c9630c54264cdf61295db
Reviewed-by: Morten Johan Sørvig <morten.sorvig@nokia.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/gui/kernel/qguiapplication.cpp b/src/gui/kernel/qguiapplication.cpp
index 095336a948..f5aea654fc 100644
--- a/src/gui/kernel/qguiapplication.cpp
+++ b/src/gui/kernel/qguiapplication.cpp
@@ -172,6 +172,11 @@ static inline void clearPalette()
 
 static void initFontUnlocked()
 {
+    if (!QGuiApplicationPrivate::app_font) {
+        if (const QPlatformTheme *theme = QGuiApplicationPrivate::platformTheme())
+            if (const QFont *font = theme->font(QPlatformTheme::SystemFont))
+                QGuiApplicationPrivate::app_font = new QFont(*font);
+    }
     if (!QGuiApplicationPrivate::app_font)
         QGuiApplicationPrivate::app_font =
             new QFont(QGuiApplicationPrivate::platformIntegration()->fontDatabase()->defaultFont());