Offset function

src/Gui/TaskView/TaskDialog.cpp

@@ -24,6 +24,7 @@
 #include "PreCompiled.h"
 
 #ifndef _PreComp_
+# include <QMessageBox>
 #endif
 
 #include "TaskDialog.h"
@@ -57,6 +58,20 @@ const std::vector<QWidget*> &TaskDialog::getDialogContent(void) const
     return Content;
 }
 
+bool TaskDialog::canClose() const
+{
+    QMessageBox msgBox;
+    msgBox.setText(tr("A dialog is already open in the task panel"));
+    msgBox.setInformativeText(QObject::tr("Do you want to close this dialog?"));
+    msgBox.setStandardButtons(QMessageBox::Yes | QMessageBox::No);
+    msgBox.setDefaultButton(QMessageBox::Yes);
+    int ret = msgBox.exec();
+    if (ret == QMessageBox::Yes)
+        return true;
+    else
+        return false;
+}
+
 //==== calls from the TaskView ===============================================================
 
 void TaskDialog::open()