QObjectPicker and QPickingSettings NearestPriorityPick picking mode

Add a new priority property on QObjectPicker and a new QPickingSettings mode.
This will select the result with the highest priority if there are several results
on a given ray. If we have several results with identical properties, the result
with the closest distance is selected.

[ChangeLog][Qt3DRender] QObjectPicker: add a priority based result selection

Change-Id: I7af12db6e163c3c2d9dad696e6d9f9bbbee064ed
Reviewed-by: Mike Krus <mike.krus@kdab.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/render/picking/objectpicker_p.h b/src/render/picking/objectpicker_p.h
index b9c308afb..7389a4b53 100644
--- a/src/render/picking/objectpicker_p.h
+++ b/src/render/picking/objectpicker_p.h
@@ -81,10 +81,15 @@ public:
     void onEntered();
     void onExited();
 
+    // Needed for unit tests
+    void setPriority(int priority);
+    int priority() const;
+
 private:
     void initializeFromPeer(const Qt3DCore::QNodeCreatedChangeBasePtr &change) final;
     void notifyJob();
 
+    int m_priority;
     bool m_isPressed;
     bool m_hoverEnabled;
     bool m_dragEnabled;