squash #6158 (#6160)

* move message_log_widget to game

* move files

* update headers

* fix cmakelists

* oracle fixes

* split implementation out to cpp

* fix recursive import

* fix main file

* format

cockatrice/src/interface/theme_manager.h

@@ -0,0 +1,62 @@
+#ifndef THEMEMANAGER_H
+#define THEMEMANAGER_H
+
+#include <QBrush>
+#include <QDir>
+#include <QLoggingCategory>
+#include <QMap>
+#include <QObject>
+#include <QPixmap>
+#include <QString>
+#include <array>
+
+inline Q_LOGGING_CATEGORY(ThemeManagerLog, "theme_manager");
+
+typedef QMap<QString, QString> QStringMap;
+typedef QMap<int, QBrush> QBrushMap;
+
+class QApplication;
+
+class ThemeManager : public QObject
+{
+    Q_OBJECT
+public:
+    ThemeManager(QObject *parent = nullptr);
+
+    enum Role
+    {
+        MinRole = 0,
+        Hand = MinRole,
+        Stack,
+        Table,
+        Player,
+        MaxRole = Player,
+    };
+
+private:
+    std::array<QBrush, Role::MaxRole + 1> brushes;
+    QStringMap availableThemes;
+    /*
+      Internal cache for multiple backgrounds
+    */
+    std::array<QBrushMap, Role::MaxRole + 1> brushesCache;
+
+protected:
+    void ensureThemeDirectoryExists();
+    QBrush loadBrush(QString fileName, QColor fallbackColor);
+    QBrush loadExtraBrush(QString fileName, QBrush &fallbackBrush);
+
+public:
+    QStringMap &getAvailableThemes();
+
+    QBrush &getBgBrush(Role zone);
+    QBrush getExtraBgBrush(Role zone, int zoneId = 0);
+protected slots:
+    void themeChangedSlot();
+signals:
+    void themeChanged();
+};
+
+extern ThemeManager *themeManager;
+
+#endif