Define auxiliary functions for metrics

Collect font, font metrics and icon size functions in a separate module.

Signed-off-by: Giuseppe Bilotta <giuseppe.bilotta@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

qt-ui/metrics.h

@@ -0,0 +1,21 @@
+/*
+ * metrics.h
+ *
+ * header file for common function to find/compute essential UI metrics
+ * (font properties, icon sizes, etc)
+ *
+ */
+#ifndef METRICS_H
+#define METRICS_H
+
+#include <QFont>
+#include <QFontMetrics>
+
+QFont defaultModelFont();
+QFontMetrics defaultModelFontMetrics();
+
+// return the default icon size, computed as the multiple of 16 closest to
+// the given height (that defaults to the default font height)
+int defaultIconSize(int height = defaultModelFontMetrics().height());
+
+#endif // METRICS_H