From 64f0d4fb353ae2e447483897839d4df8b5b32f54 Mon Sep 17 00:00:00 2001
From: Miikka Heikkinen <miikka.heikkinen@theqtcompany.com>
Date: Tue, 29 Dec 2015 12:27:48 +0200
Subject: Add a method for checking if context was successfully created

Now it is possible to check after graph construction if the graph
is actually usable in environments where the OpenGL support might
not be sufficient.

Task-number: QTRD-3748
Change-Id: Ia68b4e51386859f6d0c7b09cb44e50a74730ca55
Reviewed-by: Titta Heikkala <titta.heikkala@theqtcompany.com>
---
 examples/datavisualization/bars/main.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'examples/datavisualization/bars')

diff --git a/examples/datavisualization/bars/main.cpp b/examples/datavisualization/bars/main.cpp
index f6d8752c..9eb7a526 100644
--- a/examples/datavisualization/bars/main.cpp
+++ b/examples/datavisualization/bars/main.cpp
@@ -30,6 +30,7 @@
 #include <QtWidgets/QSlider>
 #include <QtWidgets/QFontComboBox>
 #include <QtWidgets/QLabel>
+#include <QtWidgets/QMessageBox>
 #include <QtGui/QScreen>
 #include <QtGui/QFontDatabase>
 
@@ -41,6 +42,13 @@ int main(int argc, char **argv)
     QWidget *container = QWidget::createWindowContainer(widgetgraph);
     //! [0]
 
+    if (!widgetgraph->hasContext()) {
+        QMessageBox msgBox;
+        msgBox.setText("Couldn't initialize the OpenGL context.");
+        msgBox.exec();
+        return -1;
+    }
+
     QSize screenSize = widgetgraph->screen()->size();
     container->setMinimumSize(QSize(screenSize.width() / 2, screenSize.height() / 1.5));
     container->setMaximumSize(screenSize);
-- 
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