Gui: add ViewParams class

A convenience class to obtain common view parameters, analogous to
existing WindowParameter class.

src/Gui/CMakeLists.txt

@@ -1071,6 +1071,7 @@ SET(Widget_CPP_SRCS
     WidgetFactory.cpp
     Widgets.cpp
     Window.cpp
+    ViewParams.cpp
 )
 SET(Widget_HPP_SRCS
     FileDialog.h
@@ -1085,6 +1086,7 @@ SET(Widget_HPP_SRCS
     WidgetFactory.h
     Widgets.h
     Window.h
+    ViewParams.h
 )
 SET(Widget_SRCS
     ${Widget_CPP_SRCS}

src/Gui/ViewParams.cpp

@@ -0,0 +1,61 @@
+/****************************************************************************
+ *   Copyright (c) 2018 Zheng, Lei (realthunder) <realthunder.dev@gmail.com>*
+ *                                                                          *
+ *   This file is part of the FreeCAD CAx development system.               *
+ *                                                                          *
+ *   This library is free software; you can redistribute it and/or          *
+ *   modify it under the terms of the GNU Library General Public            *
+ *   License as published by the Free Software Foundation; either           *
+ *   version 2 of the License, or (at your option) any later version.       *
+ *                                                                          *
+ *   This library  is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of         *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
+ *   GNU Library General Public License for more details.                   *
+ *                                                                          *
+ *   You should have received a copy of the GNU Library General Public      *
+ *   License along with this library; see the file COPYING.LIB. If not,     *
+ *   write to the Free Software Foundation, Inc., 59 Temple Place,          *
+ *   Suite 330, Boston, MA  02111-1307, USA                                 *
+ *                                                                          *
+ ****************************************************************************/
+
+#include "PreCompiled.h"
+#include <App/Application.h>
+#include "ViewParams.h"
+
+using namespace Gui;
+
+ViewParams::ViewParams() {
+    handle = App::GetApplication().GetParameterGroupByPath(
+            "User parameter:BaseApp/Preferences/View");
+    handle->Attach(this);
+#undef FC_VIEW_PARAM
+#define FC_VIEW_PARAM(_name,_ctype,_type,_def) \
+    _name = handle->Get##_type(#_name,_def);
+
+    FC_VIEW_PARAMS
+}
+
+ViewParams::~ViewParams() {
+}
+
+void ViewParams::OnChange(Base::Subject<const char*> &, const char* sReason) {
+    if(!sReason)
+        return;
+#undef FC_VIEW_PARAM
+#define FC_VIEW_PARAM(_name,_ctype,_type,_def) \
+    if(strcmp(sReason,#_name)==0) {\
+        _name = handle->Get##_type(#_name,_def);\
+        return;\
+    }
+    FC_VIEW_PARAMS
+}
+
+ViewParams *ViewParams::instance() {
+    static ViewParams *inst;
+    if(!inst)
+        inst = new ViewParams;
+    return inst;
+}
+

src/Gui/ViewParams.h

@@ -0,0 +1,79 @@
+/****************************************************************************
+ *   Copyright (c) 2018 Zheng, Lei (realthunder) <realthunder.dev@gmail.com>*
+ *                                                                          *
+ *   This file is part of the FreeCAD CAx development system.               *
+ *                                                                          *
+ *   This library is free software; you can redistribute it and/or          *
+ *   modify it under the terms of the GNU Library General Public            *
+ *   License as published by the Free Software Foundation; either           *
+ *   version 2 of the License, or (at your option) any later version.       *
+ *                                                                          *
+ *   This library  is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of         *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
+ *   GNU Library General Public License for more details.                   *
+ *                                                                          *
+ *   You should have received a copy of the GNU Library General Public      *
+ *   License along with this library; see the file COPYING.LIB. If not,     *
+ *   write to the Free Software Foundation, Inc., 59 Temple Place,          *
+ *   Suite 330, Boston, MA  02111-1307, USA                                 *
+ *                                                                          *
+ ****************************************************************************/
+
+#ifndef GUI_VIEW_PARAMS_H
+#define GUI_VIEW_PARAMS_H
+
+
+#include <Base/Parameter.h>
+
+namespace Gui {
+
+/** Convenient class to obtain view provider related parameters */
+class GuiExport ViewParams: public ParameterGrp::ObserverType {
+public:
+    ViewParams();
+    virtual ~ViewParams();
+    void OnChange(Base::Subject<const char*> &, const char* sReason);
+    static ViewParams *instance();
+
+    ParameterGrp::handle getHandle() {
+        return handle;
+    }
+
+#define FC_VIEW_PARAMS \
+    FC_VIEW_PARAM(UseNewSelection,bool,Bool,true) \
+    FC_VIEW_PARAM(UseSelectionRoot,bool,Bool,true) \
+    FC_VIEW_PARAM(EnableSelection,bool,Bool,true) \
+    FC_VIEW_PARAM(RenderCache,int,Int,0) \
+    FC_VIEW_PARAM(RandomColor,bool,Bool,false) \
+    FC_VIEW_PARAM(BoundingBoxColor,unsigned long,Unsigned,4294967295UL) \
+    FC_VIEW_PARAM(AnnotationTextColor,unsigned long,Unsigned,4294967295UL) \
+    FC_VIEW_PARAM(MarkerSize,int,Int,9) \
+    FC_VIEW_PARAM(DefaultLinkColor,unsigned long,Unsigned,0x66FFFF00) \
+    FC_VIEW_PARAM(DefaultShapeLineColor,unsigned long,Unsigned,421075455UL) \
+    FC_VIEW_PARAM(DefaultShapeColor,unsigned long,Unsigned,0xCCCCCC00) \
+    FC_VIEW_PARAM(DefaultShapeLineWidth,int,Int,2) \
+    FC_VIEW_PARAM(CoinCycleCheck,bool,Bool,true) \
+    FC_VIEW_PARAM(EnablePropertyViewForInactiveDocument,bool,Bool,true) \
+
+#undef FC_VIEW_PARAM
+#define FC_VIEW_PARAM(_name,_ctype,_type,_def) \
+    _ctype get##_name() const { return _name; }\
+    void set##_name(_ctype _v) { handle->Set##_type(#_name,_v); _name=_v; }
+
+    FC_VIEW_PARAMS
+
+private:
+#undef FC_VIEW_PARAM
+#define FC_VIEW_PARAM(_name,_ctype,_type,_def) \
+    _ctype _name;
+
+    FC_VIEW_PARAMS
+    ParameterGrp::handle handle;
+};
+
+#undef FC_VIEW_PARAM
+
+} // namespace Gui
+
+#endif // GUI_VIEW_PARAMS_H

src/Gui/ViewProviderMeasureDistance.cpp

@@ -45,6 +45,7 @@
 #include "Application.h"
 #include "Document.h"
 #include "View3DInventorViewer.h"
+#include "ViewParams.h"
 
 #include <App/PropertyGeo.h>
 #include <App/PropertyStandard.h>
@@ -170,7 +171,8 @@ void ViewProviderMeasureDistance::attach(App::DocumentObject* pcObject)
     lineSep->addChild(pCoords);
     lineSep->addChild(pLines);
     SoMarkerSet* points = new SoMarkerSet();
-    points->markerIndex = Gui::Inventor::MarkerBitmaps::getMarkerIndex("CROSS", App::GetApplication().GetParameterGroupByPath("User parameter:BaseApp/Preferences/View")->GetInt("MarkerSize", 9));
+    points->markerIndex = Gui::Inventor::MarkerBitmaps::getMarkerIndex("CROSS", 
+            ViewParams::instance()->getMarkerSize());
     points->numPoints=2;
     lineSep->addChild(points);
 
@@ -289,7 +291,8 @@ ViewProviderPointMarker::ViewProviderPointMarker()
     pCoords->ref();
     pCoords->point.setNum(0);
     pMarker = new SoMarkerSet();
-    pMarker->markerIndex = Gui::Inventor::MarkerBitmaps::getMarkerIndex("CROSS", App::GetApplication().GetParameterGroupByPath("User parameter:BaseApp/Preferences/View")->GetInt("MarkerSize", 9));
+    pMarker->markerIndex = Gui::Inventor::MarkerBitmaps::getMarkerIndex("CROSS",
+            ViewParams::instance()->getMarkerSize());
     pMarker->numPoints=0;
     pMarker->ref();