Fem: add push button to export customed fluid and solid material to FCMat file

src/Mod/Fem/TaskPanelFemMaterial.ui

@@ -137,24 +137,14 @@
         <property name="fieldGrowthPolicy">
          <enum>QFormLayout::AllNonFixedFieldsGrow</enum>
         </property>
-        <item row="3" column="0">
+        <item row="4" column="0">
          <widget class="QLabel" name="label_8">
           <property name="text">
-           <string>Density</string>
+           <string>Density                     </string>
           </property>
          </widget>
         </item>
-        <item row="2" column="0">
+        <item row="4" column="1">
-         <widget class="QPushButton" name="pushButton_saveas">
-          <property name="text">
-           <string>save as name</string>
-          </property>
-         </widget>
-        </item>
-        <item row="2" column="1">
-         <widget class="QLineEdit" name="edit_name"/>
-        </item>
-        <item row="3" column="1">
          <widget class="Gui::InputField" name="input_fd_density">
           <property name="sizePolicy">
            <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
@@ -576,6 +566,13 @@
       <string>External material resources</string>
      </property>
      <layout class="QVBoxLayout" name="verticalLayout_6">
+      <item>
+       <widget class="QPushButton" name="pushButton_saveas">
+        <property name="text">
+         <string>save customed material</string>
+        </property>
+       </widget>
+      </item>
       <item>
        <widget class="QPushButton" name="pushButton_MatWeb">
         <property name="text">

src/Mod/Fem/_TaskPanelFemMaterial.py

@@ -30,6 +30,8 @@ __url__ = "http://www.freecadweb.org"
 import FreeCAD
 import FreeCADGui
 from PySide import QtGui
+from PySide.QtGui import QFileDialog
+from PySide.QtGui import QMessageBox
 from PySide import QtCore
 import Units
 
@@ -51,8 +53,8 @@ class _TaskPanelFemMaterial:
         self.references_shape_type = None
 
         self.form = FreeCADGui.PySideUic.loadUi(FreeCAD.getHomePath() + "Mod/Fem/TaskPanelFemMaterial.ui")
-        QtCore.QObject.connect(self.form.pushButton_MatWeb, QtCore.SIGNAL("clicked()"), self.goMatWeb)
+        QtCore.QObject.connect(self.form.pushButton_MatWeb, QtCore.SIGNAL("clicked()"), self.goto_MatWeb)
-        QtCore.QObject.connect(self.form.pushButton_saveas, QtCore.SIGNAL("clicked()"), self.saveas_material)
+        QtCore.QObject.connect(self.form.pushButton_saveas, QtCore.SIGNAL("clicked()"), self.export_material)
         QtCore.QObject.connect(self.form.cb_materials, QtCore.SIGNAL("activated(int)"), self.choose_material)
         QtCore.QObject.connect(self.form.pushButton_Reference, QtCore.SIGNAL("clicked()"), self.add_references)
         QtCore.QObject.connect(self.form.rb_standard, QtCore.SIGNAL("toggled(bool)"), self.choose_selection_mode_standard)
@@ -154,7 +156,7 @@ class _TaskPanelFemMaterial:
                 return False
         return True
 
-    def goMatWeb(self):
+    def goto_MatWeb(self):
         import webbrowser
         webbrowser.open("http://matweb.com")
 
@@ -353,6 +355,7 @@ class _TaskPanelFemMaterial:
         self.form.cb_materials.addItem(QtGui.QIcon(":/icons/help-browser.svg"), material_name, material_name)
         self.materials[material_name] = material
 
+    ######################## material import and export ###################
     def import_materials(self):
         self.materials = {}
         self.pathList = []
@@ -388,7 +391,7 @@ class _TaskPanelFemMaterial:
 
         use_mat_from_config_dir = self.fem_prefs.GetBool("UseMaterialsFromConfigDir", True)
         if use_mat_from_config_dir:
-            user_mat_dirname = FreeCAD.getUserAppDataDir() + "Materials"
+            user_mat_dirname = FreeCAD.getUserAppDataDir() + "FluidMaterial"
             self.add_mat_dir(user_mat_dirname, ":/icons/preferences-general.svg")
 
         use_mat_from_custom_dir = self.fem_prefs.GetBool("UseMaterialsFromCustomDir", True)
@@ -413,10 +416,71 @@ class _TaskPanelFemMaterial:
         for mat in material_name_list:
             self.form.cb_materials.addItem(QtGui.QIcon(icon), mat[0], mat[1])
 
-    def saveas_material(self):
+    def export_FCMat(self, fileName, matDict):
-        import Material
+        """
-        mat_file_extension = ".FCMat"
+        Write a material dictionary to a FCMat file, a version without group support, with Python3
-        # overwritinig warning, save to customed dir,  material name check
+        <https://github.com/FreeCAD/FreeCAD/blob/master/src/Mod/Material/Material.py>
+        """
+        try:
+            import ConfigParser as configparser
+        except:
+            import configparser  # Python 3
+        import string
+        Config = configparser.ConfigParser()
+        Config.optionxform = str  # disable conversion all uppercase leter in key into lower case
+
+        # ignore creating group, just fill all into group 'FCMat'
+        grp = 'FCMat'
+        if not Config.has_section(grp):
+            Config.add_section(grp)
+        for x in matDict.keys():
+            Config.set(grp,x,matDict[x])
+
+        Preamble = "# This is a FreeCAD material-card file\n\n"
+        # Writing our configuration file to 'example.cfg'
+        with open(fileName, 'wb') as configfile:
+            configfile.write(Preamble)
+            Config.write(configfile)
+
+    def export_material(self):
+        import os
+        if self.obj.Category == 'Fluid':
+            MaterialDir = 'FluidMaterial'
+        else:
+            MaterialDir = 'Material'
+        _UseMaterialsFromCustomDir = self.fem_prefs.GetBool("UseMaterialsFromCustomDir", True)
+        _dir =self.fem_prefs.GetString("CustomMaterialsDir", "")
+        if  _UseMaterialsFromCustomDir and _dir != "" and os.path.isdir(_dir): 
+            TargetDir = self.fem_prefs.GetString("CustomMaterialsDir", "")
+        elif self.fem_prefs.GetBool("UseMaterialsFromConfigDir", True):
+            TargetDir = FreeCAD.getUserAppDataDir() + os.path.sep + MaterialDir  # $HOME/.FreeCAD
+        else:
+            FreeCAD.Console.PrintMessage("Customed material saving directory is not setup in Fem preference")
+        if not os.path.exists(TargetDir):
+            os.mkdir(TargetDir)
+
+        saveName, Filter = QFileDialog.getSaveFileName(None, "Save a Material property file", TargetDir,  "*.FCMat")
+        if not saveName == "":
+            print(saveName)
+            knownMaterials = [self.form.cb_materials.itemText(i) for i in range(self.form.cb_materials.count())]
+            material_name = os.path.basename(saveName[:-len('.FCMat')])
+            if material_name not in knownMaterials:
+                self.export_FCMat(saveName, self.obj.Material)
+                FreeCAD.Console.PrintMessage("Sucessfully save the Material property file: "+ saveName + "\n")
+            else:
+                self.export_FCMat(saveName, self.obj.Material)
+                FreeCAD.Console.PrintMessage("Sucessfully overwritren the Material property file: "+ saveName + "\n")
+                """
+                msgBox = QMessageBox()
+                msgBox.setText("FcMat file name {} has existed in {} or system folder, overwriting?\n".format(saveName, TargetDir))
+                msgBox.addButton(QMessageBox.Yes)
+                msgBox.addButton(QMessageBox.No)
+                msgBox.setDefaultButton(QMessageBox.No)
+                ret = msgBox.exec_()
+                if ret == QMessageBox.Yes:
+                    self.export_FCMat(saveName, self.obj.Material)
+                    FreeCAD.Console.PrintMessage("Sucessfully overwritren the Material property file: "+ saveName + "\n")
+                """
 
     ###################geometry reference selection #################
     def references_list_right_clicked(self, QPos):

src/Mod/Material/FluidMaterial/None.FCMat

@@ -5,7 +5,7 @@ Description = None
 Density = 0 kg/m^3
 DynamicViscosity = 0 kg/m/s
 KinematicViscosity = 0 m^2/s
-VolumetricExpansionCoefficient = 0 m/m/K
+VolumetricThermalExpansionCoefficient = 0 m/m/K
 
 SpecificHeat = 0 J/kg/K
 ThermalConductivity = 0 W/m/K

src/Mod/Material/FluidMaterial/Water.FCMat

@@ -7,7 +7,7 @@ Density = 998 kg/m^3
 DynamicViscosity = 1.003e-3 kg/m/s 
 KinematicViscosity = 1.005 m^2/s
 
-VolumetricExpansionCoefficient = 2.07e-4 m/m/K
+VolumetricThermalExpansionCoefficient = 2.07e-4 m/m/K
 
 SpecificHeat = 4.182 J/kg/K
 ThermalConductivity = 0.591 W/m/K