From 40065ab65c4f347ac5c3731fcea628ab26b49c1e Mon Sep 17 00:00:00 2001
From: Jens Steinhauser <jens.steinhauser@gmail.com>
Date: Thu, 22 May 2014 22:03:21 +0200
Subject: [PATCH] SamplingBar: Show total sampling time in a tooltip.

---
 pv/toolbars/samplingbar.cpp | 28 ++++++++++++++++++++++++++++
 pv/toolbars/samplingbar.h   |  3 +++
 2 files changed, 31 insertions(+)

diff --git a/pv/toolbars/samplingbar.cpp b/pv/toolbars/samplingbar.cpp
index 91c4b07..05c730b 100644
--- a/pv/toolbars/samplingbar.cpp
+++ b/pv/toolbars/samplingbar.cpp
@@ -26,6 +26,8 @@
 
 #include <QAction>
 #include <QDebug>
+#include <QHelpEvent>
+#include <QToolTip>
 
 #include "samplingbar.h"
 
@@ -93,6 +95,9 @@ SamplingBar::SamplingBar(SigSession &session, QWidget *parent) :
 	addWidget(&_sample_rate);
 
 	addWidget(&_run_stop_button);
+
+	_sample_count.installEventFilter(this);
+	_sample_rate.installEventFilter(this);
 }
 
 void SamplingBar::set_device_list(
@@ -446,5 +451,28 @@ void SamplingBar::on_config_changed()
 	update_sample_rate_selector();
 }
 
+bool SamplingBar::eventFilter(QObject *watched, QEvent *event)
+{
+	if ((watched == &_sample_count || watched == &_sample_rate) &&
+		(event->type() == QEvent::ToolTip)) {
+		double sec = (double)_sample_count.value() / _sample_rate.value();
+
+		QString str;
+		QTextStream(&str)
+			<< tr("Total sampling time: ")
+			<< fixed
+			<< qSetRealNumberPrecision(1)
+			<< sec
+			<< "s";
+
+		QHelpEvent *help_event = static_cast<QHelpEvent*>(event);
+		QToolTip::showText(help_event->globalPos(), str);
+
+		return true;
+	}
+
+	return false;
+}
+
 } // namespace toolbars
 } // namespace pv
diff --git a/pv/toolbars/samplingbar.h b/pv/toolbars/samplingbar.h
index e59d2f9..e2e24b7 100644
--- a/pv/toolbars/samplingbar.h
+++ b/pv/toolbars/samplingbar.h
@@ -89,6 +89,9 @@ private slots:
 
 	void on_config_changed();
 
+protected:
+	bool eventFilter(QObject *watched, QEvent *event);
+
 private:
 	SigSession &_session;
 
-- 
2.30.2