Fix some palette issues under OSX

support/osxstyle.cpp

@@ -0,0 +1,66 @@
+/*
+ * Cantata
+ *
+ * Copyright (c) 2011-2014 Craig Drummond <craig.p.drummond@gmail.com>
+ *
+ * ----
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "osxstyle.h"
+#include "globalstatic.h"
+#include <QApplication>
+#include <QStyle>
+#include <QTreeWidget>
+#include <QPainter>
+
+GLOBAL_STATIC(OSXStyle, instance)
+
+OSXStyle::OSXStyle()
+    : view(0)
+{
+}
+
+const QPalette & OSXStyle::viewPalette()
+{
+    return viewWidget()->palette();
+}
+
+void OSXStyle::drawSelection(QStyleOptionViewItemV4 opt, QPainter *painter, double opacity)
+{
+    opt.palette=viewPalette();
+    if (opacity<0.999) {
+        QColor col(opt.palette.highlight().color());
+        col.setAlphaF(opacity);
+        opt.palette.setColor(opt.palette.currentColorGroup(), QPalette::Highlight, col);
+    }
+    QApplication::style()->drawPrimitive(QStyle::PE_PanelItemViewItem, &opt, painter, viewWidget());
+}
+
+QColor OSXStyle::monoIconColor()
+{
+    return QColor(96, 96, 96);
+}
+
+QTreeWidget * OSXStyle::viewWidget()
+{
+    if (!view) {
+        view=new QTreeWidget();
+        view->ensurePolished();
+    }
+    return view;
+}