New option Measurements->Unload measurements.

--HG--
branch : develop

src/app/valentina/mainwindow.cpp

@@ -1140,6 +1140,7 @@ void MainWindow::LoadIndividual()
             {
                 watcher->removePath(AbsoluteMPath(curFile, doc->MPath()));
             }
+            ui->actionUnloadMeasurements->setEnabled(true);
             doc->SetPath(RelativeMPath(curFile, mPath));
             watcher->addPath(mPath);
             PatternWasModified(false);
@@ -1166,6 +1167,7 @@ void MainWindow::LoadStandard()
             {
                 watcher->removePath(AbsoluteMPath(curFile, doc->MPath()));
             }
+            ui->actionUnloadMeasurements->setEnabled(true);
             doc->SetPath(RelativeMPath(curFile, mPath));
             watcher->addPath(mPath);
             PatternWasModified(false);
@@ -1176,6 +1178,31 @@ void MainWindow::LoadStandard()
     }
 }
 
+//---------------------------------------------------------------------------------------------------------------------
+void MainWindow::UnloadMeasurements()
+{
+    if (doc->MPath().isEmpty())
+    {
+        ui->actionUnloadMeasurements->setDisabled(true);
+        return;
+    }
+
+    if (doc->ListMeasurements().isEmpty())
+    {
+        watcher->removePath(AbsoluteMPath(curFile, doc->MPath()));
+        doc->SetPath(QString());
+        PatternWasModified(false);
+        ui->actionShowM->setEnabled(false);
+        ui->actionUnloadMeasurements->setDisabled(true);
+        helpLabel->setText(tr("Measurements unloaded"));
+    }
+    else
+    {
+        qCWarning(vMainWindow, "%s",
+                  qUtf8Printable(tr("Couldn't unload measurements. Some of them are used in the pattern.")));
+    }
+}
+
 //---------------------------------------------------------------------------------------------------------------------
 void MainWindow::CreateMeasurements()
 {
@@ -2132,6 +2159,7 @@ void MainWindow::Clear()
     ui->actionShowCurveDetails->setEnabled(false);
     ui->actionLoadIndividual->setEnabled(false);
     ui->actionLoadStandard->setEnabled(false);
+    ui->actionUnloadMeasurements->setEnabled(false);
     ui->actionShowM->setEnabled(false);
     SetEnableTool(false);
     qApp->setPatternUnit(Unit::Cm);
@@ -2375,6 +2403,7 @@ void MainWindow::SetEnableWidgets(bool enable)
     ui->actionShowCurveDetails->setEnabled(enable);
     ui->actionLoadIndividual->setEnabled(enable);
     ui->actionLoadStandard->setEnabled(enable);
+    ui->actionUnloadMeasurements->setEnabled(enable);
 
     //Now we don't want allow user call context menu
     sceneDraw->SetDisableTools(!enable, doc->GetNameActivPP());
@@ -3178,6 +3207,7 @@ void MainWindow::CreateActions()
     }
 
     connect(ui->actionSyncMeasurements, &QAction::triggered, this, &MainWindow::SyncMeasurements);
+    connect(ui->actionUnloadMeasurements, &QAction::triggered, this, &MainWindow::UnloadMeasurements);
 }
 
 //---------------------------------------------------------------------------------------------------------------------
@@ -3336,6 +3366,7 @@ bool MainWindow::LoadPattern(const QString &fileName, const QString& customMeasu
             }
             else
             {
+                ui->actionUnloadMeasurements->setEnabled(true);
                 watcher->addPath(path);
                 ui->actionShowM->setEnabled(true);
             }

src/app/valentina/mainwindow.h

@@ -163,6 +163,7 @@ protected:
 private slots:
     void LoadIndividual();
     void LoadStandard();
+    void UnloadMeasurements();
     void CreateMeasurements();
     void ShowMeasurements();
     void MeasurementsChanged(const QString &path);

src/app/valentina/mainwindow.ui

@@ -1090,6 +1090,7 @@
     <addaction name="actionTable"/>
     <addaction name="actionLoadIndividual"/>
     <addaction name="actionLoadStandard"/>
+    <addaction name="actionUnloadMeasurements"/>
     <addaction name="actionCreateNew"/>
     <addaction name="actionShowM"/>
     <addaction name="actionSyncMeasurements"/>
@@ -1991,6 +1992,20 @@
     <string notr="true"/>
    </property>
   </action>
+  <action name="actionUnloadMeasurements">
+   <property name="enabled">
+    <bool>false</bool>
+   </property>
+   <property name="text">
+    <string>Unload measurements</string>
+   </property>
+   <property name="toolTip">
+    <string>Unload measurements if they was not used in a pattern file.</string>
+   </property>
+   <property name="shortcut">
+    <string notr="true"/>
+   </property>
+  </action>
  </widget>
  <layoutdefault spacing="6" margin="11"/>
  <customwidgets>
@@ -2004,8 +2019,8 @@
   <tabstop>toolButtonSplinePath</tabstop>
  </tabstops>
  <resources>
-  <include location="share/resources/toolicon.qrc"/>
   <include location="../../libs/vmisc/share/resources/icon.qrc"/>
+  <include location="share/resources/toolicon.qrc"/>
  </resources>
  <connections/>
 </ui>

src/libs/ifc/xml/vabstractpattern.cpp

@@ -457,12 +457,6 @@ QString VAbstractPattern::MPath() const
 //---------------------------------------------------------------------------------------------------------------------
 void VAbstractPattern::SetPath(const QString &path)
 {
-    if (path.isEmpty())
-    {
-        qDebug()<<"Path to measurements is empty"<<Q_FUNC_INFO;
-        return;
-    }
-
     if (setTagText(TagMeasurements, path))
     {
         emit patternChanged(false);

src/libs/ifc/xml/vdomdocument.cpp

@@ -691,8 +691,11 @@ bool VDomDocument::setTagText(const QString &tag, const QString &text)
             {
                 QDomElement parent = domElement.parentNode().toElement();
                 QDomElement newTag = createElement(tag);
-                const QDomText newTagText = createTextNode(text);
-                newTag.appendChild(newTagText);
+                if (not text.isEmpty())
+                {
+                    const QDomText newTagText = createTextNode(text);
+                    newTag.appendChild(newTagText);
+                }
 
                 parent.replaceChild(newTag, domElement);
                 return true;