From e2a0cbce421e07be4168d7e3916d09cdf008ca62 Mon Sep 17 00:00:00 2001
From: falkTX <falktx@gmail.com>
Date: Sat, 7 Jan 2017 18:54:28 +0000
Subject: [PATCH] Fix canvas usage with qt 4.6

---
 source/widgets/draggablegraphicsview.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/source/widgets/draggablegraphicsview.py b/source/widgets/draggablegraphicsview.py
index cbf32b9ba..a59e4a7f5 100644
--- a/source/widgets/draggablegraphicsview.py
+++ b/source/widgets/draggablegraphicsview.py
@@ -41,8 +41,13 @@ class DraggableGraphicsView(QGraphicsView):
 
         self.fPanning = False
 
+        try:
+            self.fMiddleButton = Qt.MiddleButton
+        except:
+            self.fMiddleButton = Qt.MidButton
+
     def mousePressEvent(self, event):
-        if event.button() == Qt.MiddleButton:
+        if event.button() == self.fMiddleButton:
             self.fPanning = True
             self.setDragMode(QGraphicsView.ScrollHandDrag)
             event = QMouseEvent(event.type(), event.pos(), Qt.LeftButton, Qt.LeftButton, event.modifiers())