QT Viewer main structure.

CMake: added an entry at main CMake script that makes QTViewer an optional build.
QT Viewer main structure only, libQGLViewer or any 3D functionality can be added to mainWindow as a widget later on.

src/qtviewer/CMakeLists.txt

@@ -0,0 +1,47 @@
+
+OPTION( QT_USE_QTVIEWER "IfcOpenShell QT GUI Viewer, QT environment required" OFF )
+
+
+IF (QT_USE_QTVIEWER)
+
+
+# Find QT header files
+SET(QT_MIN_VERSION "4.5.0")
+FIND_PACKAGE(Qt4 REQUIRED)
+FIND_PACKAGE(Qt4 COMPONENTS QtCore QtGui QtOpenGL)
+
+INCLUDE(${QT_USE_FILE})
+SET(CMAKE_PACKAGE_QTGUI TRUE)
+SET(CMAKE_PACKAGE_QTSVG TRUE)
+
+# Find QT header files
+IF("$ENV{QT_INCLUDE_DIR}" STREQUAL "") 
+        SET(QT_INCLUDE_DIR "/usr/include/QT4/" CACHE FILEPATH "QT4 header files")
+        MESSAGE(STATUS "Looking for QT4 include files in: ${QT_INCLUDE_DIR}")
+        MESSAGE(STATUS "Use QT_INCLUDE_DIR to specify another directory")
+ELSE()
+        SET(QT_INCLUDE_DIR $ENV{QT_INCLUDE_DIR} CACHE FILEPATH "QT4 header files")
+        MESSAGE(STATUS "Looking for QT4 include files in: ${QT_INCLUDE_DIR}")
+ENDIF()
+
+
+INCLUDE_DIRECTORIES(${QGLViewer_INCLUDE_DIR})
+
+SET(QTviewer_SRCS
+        ../../src/qtviewer/mainwindow.h
+        ../../src/qtviewer/mainwindow.cpp
+        ../../src/qtviewer/main.cpp
+)
+SET(QTviewer_MOC_SRCS 
+        ../../src/qtviewer/mainwindow.h
+)
+
+QT_WRAP_CPP(QTviewer QTviewer_SRCS ${QTviewer_MOC_SRCS})
+
+ADD_EXECUTABLE(  QTviewer ${QTviewer_SRCS} ${QTviewer_MOC_SRCS})
+#http://www.qtcentre.org/wiki/index.php?title=Compiling_Qt4_apps_with_CMake
+
+TARGET_LINK_libRARIES (QTviewer IfcParse IfcGeom ${QT_LIBRARIES} TKernel TKMath TKBRep TKGeomBase TKGeomAlgo TKG3d TKG2d TKShHealing TKTopAlgo TKMesh TKPrim TKBool TKBO TKFillet)
+
+
+ENDIF (QT_USE_QTVIEWER)