From 94a7330459de053b2c11f6646e5871ba852929b7 Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Fri, 6 Oct 2017 16:28:30 +0200
Subject: [PATCH] add signal to scroll to view object

---
 src/Gui/Document.h        |  2 ++
 src/Gui/DocumentPy.xml    |  9 +++++++--
 src/Gui/DocumentPyImp.cpp | 13 +++++++++++++
 src/Gui/Tree.cpp          | 10 ++++++++++
 src/Gui/Tree.h            |  2 ++
 5 files changed, 34 insertions(+), 2 deletions(-)

diff --git a/src/Gui/Document.h b/src/Gui/Document.h
index 01ebc29935..ca568a887b 100644
--- a/src/Gui/Document.h
+++ b/src/Gui/Document.h
@@ -114,6 +114,8 @@ public:
     /// signal on changed Object, the 2nd argument is the highlite mode to use
     mutable boost::signal<void (const Gui::ViewProviderDocumentObject&,
                                 const Gui::TreeItemMode&)>               signalExpandObject;
+    /// signal on scrolling to an object
+    mutable boost::signal<void (const Gui::ViewProviderDocumentObject&)> signalScrollToObject;
     /// signal on undo Document
     mutable boost::signal<void (const Gui::Document& doc)> signalUndoDocument;
     /// signal on redo Document
diff --git a/src/Gui/DocumentPy.xml b/src/Gui/DocumentPy.xml
index 4f28cbe2f8..561435afc6 100644
--- a/src/Gui/DocumentPy.xml
+++ b/src/Gui/DocumentPy.xml
@@ -96,7 +96,12 @@
 			  <UserDocu>toggleTreeItem(DocObject,int=0) - change TreeItem of a document object 0:Toggle,1:Collaps,2:Expand</UserDocu>
 		  </Documentation>
 	  </Methode>
-	  <Attribute Name="ActiveObject" ReadOnly="false">
+      <Methode Name="scrollToTreeItem">
+          <Documentation>
+              <UserDocu>scrollToTreeItem(ViewObject) - scroll the tree view to the item of a view object</UserDocu>
+          </Documentation>
+      </Methode>
+      <Attribute Name="ActiveObject" ReadOnly="false">
 	  <Documentation>
 		<UserDocu>The active object of the document</UserDocu>
 	  </Documentation>
@@ -121,4 +126,4 @@
 			<Parameter Name="Modified" Type="Boolean" />
 		</Attribute>
 	</PythonExport>
-</GenerateModel>
+</GenerateModel>
diff --git a/src/Gui/DocumentPyImp.cpp b/src/Gui/DocumentPyImp.cpp
index 0b7da59358..47db5522fd 100644
--- a/src/Gui/DocumentPyImp.cpp
+++ b/src/Gui/DocumentPyImp.cpp
@@ -42,6 +42,7 @@
 #include "Tree.h"
 #include "ViewProviderDocumentObject.h"
 #include "ViewProviderPy.h"
+#include "ViewProviderDocumentObjectPy.h"
 
 
 using namespace Gui;
@@ -308,6 +309,18 @@ PyObject* DocumentPy::toggleTreeItem(PyObject *args)
     Py_Return;
 }
 
+PyObject* DocumentPy::scrollToTreeItem(PyObject *args)
+{
+    PyObject *view;
+    if (!PyArg_ParseTuple(args,"O!",&(Gui::ViewProviderDocumentObjectPy::Type), &view))
+        return 0;
+
+    Gui::ViewProviderDocumentObject* vp = static_cast<ViewProviderDocumentObjectPy*>
+            (view)->getViewProviderDocumentObjectPtr();
+    getDocumentPtr()->signalScrollToObject(*vp);
+    Py_Return;
+}
+
 Py::Object DocumentPy::getActiveObject(void) const
 {
     App::DocumentObject *object = getDocumentPtr()->getDocument()->getActiveObject();
diff --git a/src/Gui/Tree.cpp b/src/Gui/Tree.cpp
index 120bac80f3..3f36bbf96e 100644
--- a/src/Gui/Tree.cpp
+++ b/src/Gui/Tree.cpp
@@ -939,6 +939,7 @@ DocumentItem::DocumentItem(const Gui::Document* doc, QTreeWidgetItem * parent)
     connectResObject = doc->signalResetEdit.connect(boost::bind(&DocumentItem::slotResetEdit, this, _1));
     connectHltObject = doc->signalHighlightObject.connect(boost::bind(&DocumentItem::slotHighlightObject, this, _1,_2,_3));
     connectExpObject = doc->signalExpandObject.connect(boost::bind(&DocumentItem::slotExpandObject, this, _1,_2));
+    connectScrObject = doc->signalScrollToObject.connect(boost::bind(&DocumentItem::slotScrollToObject, this, _1));
 
     setFlags(Qt::ItemIsEnabled/*|Qt::ItemIsEditable*/);
 }
@@ -954,6 +955,7 @@ DocumentItem::~DocumentItem()
     connectResObject.disconnect();
     connectHltObject.disconnect();
     connectExpObject.disconnect();
+    connectScrObject.disconnect();
 }
 
 #define FOREACH_ITEM(_item, _obj) \
@@ -1317,6 +1319,14 @@ void DocumentItem::slotExpandObject (const Gui::ViewProviderDocumentObject& obj,
     END_FOREACH_ITEM
 }
 
+void DocumentItem::slotScrollToObject(const Gui::ViewProviderDocumentObject& obj)
+{
+    FOREACH_ITEM(item,obj)
+        QTreeWidget* tree = item->treeWidget();
+        tree->scrollToItem(item, QAbstractItemView::PositionAtTop);
+    END_FOREACH_ITEM
+}
+
 const Gui::Document* DocumentItem::document() const
 {
     return this->pDocument;
diff --git a/src/Gui/Tree.h b/src/Gui/Tree.h
index aec91138d4..913fa49ddb 100644
--- a/src/Gui/Tree.h
+++ b/src/Gui/Tree.h
@@ -174,6 +174,7 @@ protected:
     void slotResetEdit       (const Gui::ViewProviderDocumentObject&);
     void slotHighlightObject (const Gui::ViewProviderDocumentObject&,const Gui::HighlightMode&,bool);
     void slotExpandObject    (const Gui::ViewProviderDocumentObject&,const Gui::TreeItemMode&);
+    void slotScrollToObject  (const Gui::ViewProviderDocumentObject&);
 
     bool createNewItem(const Gui::ViewProviderDocumentObject&, 
                     QTreeWidgetItem *parent=0, int index=-1, 
@@ -193,6 +194,7 @@ private:
     Connection connectResObject;
     Connection connectHltObject;
     Connection connectExpObject;
+    Connection connectScrObject;
 };
 
 /** The link between the tree and a document object.