wpa_gui-qt4: Improve scan results signal display

Display signal strength in dBm with visual indicator in the form of a
bar for scan results displayed by wpa_gui-qt4. Any signal > -35dBm is
treated as full signal bar, signals between range of -95<->-35dBm are
displayed linearly. Convert WEXT signal level value to scale that
nl80211 typically reports in dBm. The condition which differentiates
8-bit WEXT dBm and regular dBm is probably fragile, but there is
currently no way to know what the driver is going to report for signal
strength.

Signed-off-by: Kel Modderman <kel@otaku42.de>

1 files changed, 34 insertions, 0 deletions

diff --git a/wpa_supplicant/wpa_gui-qt4/signalbar.h b/wpa_supplicant/wpa_gui-qt4/signalbar.h
new file mode 100644
index 0000000..3d5dec1
--- /dev/null
+++ b/wpa_supplicant/wpa_gui-qt4/signalbar.h
@@ -0,0 +1,34 @@
+/*
+ * wpa_gui - SignalBar class
+ * Copyright (c) 2011, Kel Modderman <kel@otaku42.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Alternatively, this software may be distributed under the terms of BSD
+ * license.
+ *
+ * See README and COPYING for more details.
+ */
+
+#ifndef SIGNALBAR_H
+#define SIGNALBAR_H
+
+#include <QObject>
+#include <QStyledItemDelegate>
+
+class SignalBar : public QStyledItemDelegate
+{
+	Q_OBJECT
+
+public:
+	SignalBar(QObject *parent = 0);
+	~SignalBar();
+
+	virtual void paint(QPainter *painter,
+			   const QStyleOptionViewItem &option,
+			   const QModelIndex &index) const ;
+};
+
+#endif /* SIGNALBAR_H */