wpa_gui: Sort frequency and signal numerically in the scan results dialog

Signal strength was sorted lexically rather than numerically, which
put "-100 dBm" before "-50 dBm" if sorted in descending order.
This change fixes that. It also treats frequency in the same
manner, preparing it for the IEEE 802.11ah.

Signed-off-by: Adrian Nowicki <adinowicki@gmail.com>

wpa_supplicant/wpa_gui-qt4/scanresults.cpp

@@ -12,6 +12,7 @@
 #include "signalbar.h"
 #include "wpagui.h"
 #include "networkconfig.h"
+#include "scanresultsitem.h"
 
 
 ScanResults::ScanResults(QWidget *parent, const char *, bool, Qt::WFlags)
@@ -95,7 +96,7 @@ void ScanResults::updateResults()
 				ssid = (*it).mid(pos);
 		}
 
-		QTreeWidgetItem *item = new QTreeWidgetItem(scanResultsWidget);
+		ScanResultsItem *item = new ScanResultsItem(scanResultsWidget);
 		if (item) {
 			item->setText(0, ssid);
 			item->setText(1, bssid);

wpa_supplicant/wpa_gui-qt4/scanresultsitem.cpp

@@ -0,0 +1,18 @@
+/*
+ * wpa_gui - ScanResultsItem class
+ * Copyright (c) 2015, Adrian Nowicki <adinowicki@gmail.com>
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ */
+
+#include "scanresultsitem.h"
+
+bool ScanResultsItem::operator< (const QTreeWidgetItem &other) const
+{
+	int sortCol = treeWidget()->sortColumn();
+	if (sortCol == 2 || sortCol == 3) {
+		return text(sortCol).toInt() < other.text(sortCol).toInt();
+	}
+	return text(sortCol) < other.text(sortCol);
+}

wpa_supplicant/wpa_gui-qt4/scanresultsitem.h

@@ -0,0 +1,21 @@
+/*
+ * wpa_gui - ScanResultsItem class
+ * Copyright (c) 2015, Adrian Nowicki <adinowicki@gmail.com>
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ */
+
+#ifndef SCANRESULTSITEM_H
+#define SCANRESULTSITEM_H
+
+#include <QtGui>
+
+class ScanResultsItem : public QTreeWidgetItem
+{
+public:
+	ScanResultsItem(QTreeWidget *tree) : QTreeWidgetItem(tree) {}
+	bool operator< (const QTreeWidgetItem &other) const;
+};
+
+#endif /* SCANRESULTSITEM_H */

wpa_supplicant/wpa_gui-qt4/wpa_gui.pro

@@ -34,6 +34,7 @@ HEADERS	+= wpamsg.h \
 	wpagui.h \
 	eventhistory.h \
 	scanresults.h \
+	scanresultsitem.h \
 	signalbar.h \
 	userdatarequest.h \
 	networkconfig.h \
@@ -45,6 +46,7 @@ SOURCES	+= main.cpp \
 	wpagui.cpp \
 	eventhistory.cpp \
 	scanresults.cpp \
+	scanresultsitem.cpp \
 	signalbar.cpp \
 	userdatarequest.cpp \
 	networkconfig.cpp \