1 files changed, 65 insertions, 0 deletions
diff --git a/core/metrics.cpp b/core/metrics.cpp
new file mode 100644
index 000000000..3c66528b8
--- /dev/null
+++ b/core/metrics.cpp
@@ -0,0 +1,65 @@
+/*
+ * metrics.cpp
+ *
+ * methods to find/compute essential UI metrics
+ * (font properties, icon sizes, etc)
+ *
+ */
+
+#include "metrics.h"
+
+static IconMetrics dfltIconMetrics;
+
+IconMetrics::IconMetrics() :
+	sz_small(-1),
+	sz_med(-1),
+	sz_big(-1),
+	sz_pic(-1),
+	spacing(-1),
+	dpr(1.0)
+{
+}
+
+QFont defaultModelFont()
+{
+	QFont font;
+//	font.setPointSizeF(font.pointSizeF() * 0.8);
+	return font;
+}
+
+QFontMetrics defaultModelFontMetrics()
+{
+	return QFontMetrics(defaultModelFont());
+}
+
+// return the default icon size, computed as the multiple of 16 closest to
+// the given height
+static int defaultIconSize(int height)
+{
+	int ret = (height + 8)/16;
+	ret *= 16;
+	if (ret < 16)
+		ret = 16;
+	return ret;
+}
+
+const IconMetrics & defaultIconMetrics()
+{
+	if (dfltIconMetrics.sz_small == -1) {
+		int small = defaultIconSize(defaultModelFontMetrics().height());
+		dfltIconMetrics.sz_small = small;
+		dfltIconMetrics.sz_med = small + small/2;
+		dfltIconMetrics.sz_big = 2*small;
+
+		dfltIconMetrics.sz_pic = 8*small;
+
+		dfltIconMetrics.spacing = small/8;
+	}
+
+	return dfltIconMetrics;
+}
+
+void updateDevicePixelRatio(double dpr)
+{
+	dfltIconMetrics.dpr = dpr;
+}