add command to show/hide several constraints at once

src/Mod/Sketcher/Gui/TaskSketcherConstrains.cpp

@@ -419,6 +419,12 @@ void ConstraintView::contextMenuEvent (QContextMenuEvent* event)
     QAction* driven = menu.addAction(tr("Toggle to/from reference"), this, SLOT(updateDrivingStatus()));
     driven->setEnabled(isToggleDriving);
 
+    menu.addSeparator();
+    QAction* show = menu.addAction(tr("Show constraints"), this, SLOT(showConstraints()));
+    show->setEnabled(!items.isEmpty());
+    QAction* hide = menu.addAction(tr("Hide constraints"), this, SLOT(hideConstraints()));
+    hide->setEnabled(!items.isEmpty());
+
     menu.addSeparator();
     CONTEXT_ITEM("Sketcher_SelectElementsAssociatedWithConstraints","Select Elements","Sketcher_SelectElementsAssociatedWithConstraints",doSelectConstraints,true)
 
@@ -454,6 +460,24 @@ void ConstraintView::updateDrivingStatus()
     }
 }
 
+void ConstraintView::showConstraints()
+{
+    QList<QListWidgetItem *> items = selectedItems();
+    for (auto it : items) {
+        if (it->checkState() != Qt::Checked)
+            it->setCheckState(Qt::Checked);
+    }
+}
+
+void ConstraintView::hideConstraints()
+{
+    QList<QListWidgetItem *> items = selectedItems();
+    for (auto it : items) {
+        if (it->checkState() != Qt::Unchecked)
+            it->setCheckState(Qt::Unchecked);
+    }
+}
+
 void ConstraintView::modifyCurrentItem()
 {
     /*emit*/itemActivated(currentItem());

src/Mod/Sketcher/Gui/TaskSketcherConstrains.h

@@ -61,6 +61,8 @@ protected Q_SLOTS:
     void doSelectConstraints();
     void updateDrivingStatus();
     void swapNamedOfSelectedItems();
+    void showConstraints();
+    void hideConstraints();
 };
 
 class TaskSketcherConstrains : public Gui::TaskView::TaskBox, public Gui::SelectionObserver