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.cpp

@@ -0,0 +1,32 @@
+/*
+ * metrics.cpp
+ *
+ * methods to find/compute essential UI metrics
+ * (font properties, icon sizes, etc)
+ *
+ */
+
+#include "metrics.h"
+
+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
+int defaultIconSize(int height)
+{
+	int ret = (height + 8)/16;
+	ret *= 16;
+	if (ret < 16)
+		ret = 16;
+	return ret;
+}

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

qt-ui/models.cpp

@@ -25,13 +25,6 @@
 #include <QMessageBox>
 #include <QStringListModel>
 
-QFont defaultModelFont()
-{
-	QFont font;
-//	font.setPointSizeF(font.pointSizeF() * 0.8);
-	return font;
-}
-
 CleanerTableModel::CleanerTableModel(QObject *parent) : QAbstractTableModel(parent)
 {
 }

qt-ui/models.h

@@ -13,12 +13,12 @@
 #include <QStringListModel>
 #include <QSortFilterProxyModel>
 
+#include "metrics.h"
+
 #include "../dive.h"
 #include "../divelist.h"
 #include "../divecomputer.h"
 
-QFont defaultModelFont();
-
 // Encapsulates Boilerplate.
 class CleanerTableModel : public QAbstractTableModel {
 	Q_OBJECT

subsurface.pro

@@ -57,6 +57,7 @@ HEADERS = \
 	qt-ui/mainwindow.h \
 	qt-ui/modeldelegates.h \
 	qt-ui/models.h \
+	qt-ui/metrics.h \
 	qt-ui/preferences.h \
 	qt-ui/printdialog.h \
 	qt-ui/printlayout.h \
@@ -143,6 +144,7 @@ SOURCES =  \
 	qt-ui/mainwindow.cpp \
 	qt-ui/modeldelegates.cpp \
 	qt-ui/models.cpp \
+	qt-ui/metrics.cpp \
 	qt-ui/preferences.cpp \
 	qt-ui/printdialog.cpp \
 	qt-ui/printlayout.cpp \