From bc9177b394e33bfec1f3fc85fb09c2f74c1c7de3 Mon Sep 17 00:00:00 2001
From: Soeren Apel <soeren@apelpie.net>
Date: Sat, 27 May 2017 16:31:15 +0200
Subject: [PATCH] DeviceManager: Show progress dialog while scanning for
 devices

We don't want users to wonder why nothing happens when they
start PV and no window shows up. Providing this dialog lets
them know that PV is starting and doing something.
---
 pv/devicemanager.cpp | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/pv/devicemanager.cpp b/pv/devicemanager.cpp
index a51148b..58f507c 100644
--- a/pv/devicemanager.cpp
+++ b/pv/devicemanager.cpp
@@ -22,12 +22,17 @@
 
 #include <cassert>
 #include <functional>
+#include <memory>
 #include <sstream>
 #include <stdexcept>
 #include <string>
 
 #include <libsigrokcxx/libsigrokcxx.hpp>
 
+#include <QApplication>
+#include <QObject>
+#include <QProgressDialog>
+
 #include <boost/filesystem.hpp>
 
 #include <pv/devices/hardwaredevice.hpp>
@@ -39,6 +44,7 @@ using std::placeholders::_1;
 using std::placeholders::_2;
 using std::shared_ptr;
 using std::string;
+using std::unique_ptr;
 
 using Glib::VariantBase;
 
@@ -51,8 +57,24 @@ namespace pv {
 DeviceManager::DeviceManager(shared_ptr<Context> context) :
 	context_(context)
 {
-	for (auto entry : context->drivers())
+	unique_ptr<QProgressDialog> progress(new QProgressDialog("",
+		QObject::tr("Cancel"), 0, context->drivers().size()));
+	progress->setWindowModality(Qt::WindowModal);
+	progress->setMinimumDuration(1);  // To show the dialog immediately
+
+	int entry_num = 1;
+
+	for (auto entry : context->drivers()) {
+		progress->setLabelText(QObject::tr("Scanning for %1...")
+			.arg(QString::fromStdString(entry.first)));
+
 		driver_scan(entry.second, map<const ConfigKey *, VariantBase>());
+
+		progress->setValue(entry_num++);
+		QApplication::processEvents();
+		if (progress->wasCanceled())
+			break;
+	}
 }
 
 const shared_ptr<sigrok::Context>& DeviceManager::context() const
-- 
2.30.2