[GUI] new feature to search for parameter groups

src/Gui/DlgParameter.ui

@@ -46,6 +46,22 @@
        </property>
       </widget>
      </item>
+     <item>
+      <widget class="QLineEdit" name="findGroupLE">
+       <property name="toolTip">
+        <string>Type in a group name to find it</string>
+       </property>
+       <property name="placeholderText">
+        <string>Search Group</string>
+       </property>
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Minimum" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
+      </widget>
+     </item>
      <item>
       <widget class="QPushButton" name="buttonFind" >
        <property name="text" >

src/Gui/DlgParameterImp.cpp

@@ -117,6 +117,15 @@ DlgParameterImp::DlgParameterImp( QWidget* parent,  Qt::WindowFlags fl )
     connect(paramGroup, SIGNAL(currentItemChanged(QTreeWidgetItem*, QTreeWidgetItem*)), 
             this, SLOT(onGroupSelected(QTreeWidgetItem*)));
     onGroupSelected(paramGroup->currentItem());
+
+    connect(ui->findGroupLE, SIGNAL(textChanged(QString)),
+        this, SLOT(on_findGroup_changed(QString)));
+
+    // setup for function on_findGroup_changed:
+    // store the current font properties
+    // because we don't know what style sheet the user uses for FC
+    defaultFont = paramGroup->font();
+    defaultColor = paramGroup->topLevelItem(0)->foreground(0);
 }
 
 /** 
@@ -135,6 +144,64 @@ void DlgParameterImp::on_buttonFind_clicked()
     finder->show();
 }
 
+void DlgParameterImp::on_findGroup_changed(const QString &SearchStr)
+{
+    // search for group tree items and highlight found results
+    // if SearchStr not empty
+
+    QTreeWidgetItem* ExpandItem;
+
+    // at first reset all items to the default font and nesting
+    if (foundList.size() > 0) {
+        for (QTreeWidgetItem* item : foundList) {
+            item->setFont(0, defaultFont);
+            item->setForeground(0, defaultColor);
+            ExpandItem = item;
+            // a group can be nested down to several levels
+            while (true) {
+                if (!ExpandItem->parent())
+                    break;
+                else {
+                    ExpandItem->setExpanded(false);
+                    ExpandItem = ExpandItem->parent();
+                }
+            }
+        }
+    }
+    // expand the top level entries to get the initial tree state
+    for (int i = 0; i < paramGroup->topLevelItemCount(); ++i) {
+        paramGroup->topLevelItem(i)->setExpanded(true);
+    }
+
+    // don't perform a search if the search is empty
+    if (SearchStr.isEmpty())
+        return;
+
+    // search the tree widget
+    foundList = paramGroup->findItems(SearchStr, Qt::MatchContains | Qt::MatchRecursive);
+    if (foundList.size() > 0) {
+        for (QTreeWidgetItem* item : foundList) {
+            item->setFont(0, boldFont);
+            item->setForeground(0, Qt::red);
+            // expand its parent to see the item
+            // a group can be nested down to several levels
+            ExpandItem = item;
+            while (true) {
+                if (!ExpandItem->parent())
+                    break;
+                else {
+                    ExpandItem->setExpanded(true);
+                    ExpandItem = ExpandItem->parent();
+                }
+            }
+            // if there is only one found item, scrollt o it
+            if (foundList.size() == 1) {
+                paramGroup->scrollToItem(foundList[0], QAbstractItemView::PositionAtCenter);
+            }
+        }
+    }
+}
+
 /**
  *  Sets the strings of the subwidgets using the current
  *  language.

src/Gui/DlgParameterImp.h

@@ -57,6 +57,7 @@ public:
 protected Q_SLOTS:
     void onChangeParameterSet(int);
     void on_buttonFind_clicked();
+    void on_findGroup_changed(const QString &SearchStr);
     void on_buttonSaveToDisk_clicked();
 
     void onGroupSelected(QTreeWidgetItem *);
@@ -73,6 +74,12 @@ protected:
     QTreeWidget* paramValue;
     Ui_DlgParameter* ui;
     QPointer<DlgParameterFind> finder;
+
+private:
+    QFont defaultFont;
+    QBrush defaultColor;
+    const QFont boldFont = QFont(QString(), -1, QFont::Bold);
+    QList<QTreeWidgetItem*> foundList;
 };
 
 // --------------------------------------------------------------------