Toggle ScrollHandDrag mode by clicking a middle mouse button.

--HG--
branch : develop

ChangeLog.txt

@@ -1,4 +1,5 @@
 # Version 0.5.0
+- Toggle ScrollHandDrag mode by clicking a middle mouse button.
 - Added horizontal scrolling by pressiong Shift + mouse wheel.
 - [#366] Update 'Point from Distance and Angle' tool to read distance and angle between points.
 - [#395] Create Curve tool which uses point as control handle.

src/libs/vwidgets/vmaingraphicsscene.cpp

@@ -80,14 +80,6 @@ void VMainGraphicsScene::mousePressEvent(QGraphicsSceneMouseEvent *event)
     }
 
     QGraphicsScene::mousePressEvent(event);
-//    if (QGuiApplication::keyboardModifiers() == Qt::ControlModifier)
-//    {
-//        QList<QGraphicsItem *> items = selectedItems();
-//        for (int i=0; i< items.size(); i++)
-//        {
-//            items[i]->setSelected(false);
-//        }
-//    }
 }
 
 //---------------------------------------------------------------------------------------------------------------------

src/libs/vwidgets/vmaingraphicsview.cpp

@@ -382,14 +382,11 @@ void VMainGraphicsView::ZoomFitBest()
  */
 void VMainGraphicsView::mousePressEvent(QMouseEvent *mousePress)
 {
-    if (mousePress->button() & Qt::LeftButton)
+    switch (mousePress->button())
     {
-        switch (QGuiApplication::keyboardModifiers())
+        case Qt::LeftButton:
         {
-            case Qt::ControlModifier:
+            QGraphicsView::setDragMode(QGraphicsView::RubberBandDrag);
-                QGraphicsView::setDragMode(QGraphicsView::ScrollHandDrag);
-                break;
-            case Qt::NoModifier:
             if (showToolOptions)
             {
                 QList<QGraphicsItem *> list = items(mousePress->pos());
@@ -416,10 +413,19 @@ void VMainGraphicsView::mousePressEvent(QMouseEvent *mousePress)
                 }
             }
             break;
+        }
+        case Qt::MiddleButton:
+        {
+            QGraphicsView::setDragMode(QGraphicsView::ScrollHandDrag);
+            // create a new mouse event that simulates a click of the left button instead of the middle button
+            QMouseEvent mouseEvent (mousePress->type(), mousePress->pos(), Qt::LeftButton, Qt::LeftButton,
+                                    mousePress->modifiers());
+            QGraphicsView::mousePressEvent(&mouseEvent);
+            return;
+        }
         default:
             break;
     }
-    }
     QGraphicsView::mousePressEvent(mousePress);
 }
 
@@ -431,7 +437,7 @@ void VMainGraphicsView::mousePressEvent(QMouseEvent *mousePress)
 void VMainGraphicsView::mouseReleaseEvent(QMouseEvent *event)
 {
     QGraphicsView::mouseReleaseEvent ( event );
-    QGraphicsView::setDragMode( QGraphicsView::RubberBandDrag );
+    QGraphicsView::setDragMode( QGraphicsView::NoDrag );
     if (event->button() == Qt::LeftButton)
     {
         emit MouseRelease();