/// <summary>
/// Implement this method as an external command for Revit.
/// </summary>
/// <param name="commandData">An object that is passed to the external application
/// which contains data related to the command,
/// such as the application object and active view.</param>
/// <param name="message">A message that can be set by the external application
/// which will be displayed if a failure or cancellation is returned by
/// the external command.</param>
/// <param name="elements">A set of elements to which the external application
/// can add elements that are to be highlighted in case of failure or cancellation.</param>
/// <returns>Return the status of the external command.
/// A result of Succeeded means that the API external method functioned as expected.
/// Cancelled can be used to signify that the user cancelled the external operation
/// at some point. Failure should be returned if the application is unable to proceed with
/// the operation.</returns>
public Autodesk.Revit.UI.Result Execute(Autodesk.Revit.UI.ExternalCommandData commandData, ref string message, Autodesk.Revit.DB.ElementSet elements)
{
Autodesk.Revit.UI.UIApplication application = commandData.Application;
m_docment = application.ActiveUIDocument.Document;
try
{
// user should select one slab firstly.
if (application.ActiveUIDocument.Selection.Elements.Size == 0)
{
TaskDialog.Show("Revit", "Please select one slab firstly.", TaskDialogCommonButtons.Ok);
return(Autodesk.Revit.UI.Result.Cancelled);
}
// get the selected slab and show its span direction
ElementSet elementSet = application.ActiveUIDocument.Selection.Elements;
ElementSetIterator elemIter = elementSet.ForwardIterator();
elemIter.Reset();
while (elemIter.MoveNext())
{
Floor floor = elemIter.Current as Floor;
if (floor != null)
{
GetSpanDirectionAndSymobls(floor);
}
}
}
catch (Exception ex)
{
message = ex.ToString();
return(Autodesk.Revit.UI.Result.Failed);
}
return(Autodesk.Revit.UI.Result.Succeeded);
}
/// <summary>
/// Reads the current selection of Revit.
/// </summary>
/// <param name="errorMessage">The error message.</param>
/// <returns>True if reading succeed; otherwise, false.</returns>
private bool ReadSelectedElementFromRevit(out string errorMessage)
{
errorMessage = string.Empty;
if (ThisExtension.Revit.ActiveUIDocument.Selection.Elements.Size == 0)
{
errorMessage = "The selection is empty";
return(false);
}
if (ThisExtension.Revit.ActiveUIDocument.Selection.Elements.Size > 1)
{
errorMessage = "The selection contains more than one element";
return(false);
}
ElementSetIterator iterator = ThisExtension.Revit.ActiveUIDocument.Selection.Elements.ForwardIterator();
iterator.Reset();
iterator.MoveNext();
FamilyInstance familyInstance = iterator.Current as FamilyInstance;
if (familyInstance == null)
{
errorMessage = "Selected element is not a FamilyInstance";
return(false);
}
if (familyInstance.StructuralType == Autodesk.Revit.DB.Structure.StructuralType.Beam ||
familyInstance.StructuralType == Autodesk.Revit.DB.Structure.StructuralType.Column ||
familyInstance.StructuralType == Autodesk.Revit.DB.Structure.StructuralType.Brace)
{
ThisMainExtension.Data.SelectedElement = familyInstance;
FillPropertiesOfSelectedElement();
FillGeometryOfSelectedElement();
return(true);
}
else
{
errorMessage = "Selected element is not a beam nor a column";
return(false);
}
}
