Method ChangeMode

roomedit/source/editcli.cpp:872–992

//////////////////////////////////////////////////////////////// TEditorClient ------------- According to edit mode : Setup menu, info windows

// According to edit mode : Setup menu, info windows
//
void TEditorClient::ChangeMode (int NewMode)
{
	SelPtr NewSel;
	int PrevMode = EditMode;
	EditMode = NewMode;

	// If same mode, return directly
	if ( PrevMode == EditMode )
		return ;

	// special cases for the selection list...
	if (Selected)
	{
		// select all LineDefs bound to the selected Sectors
		if (PrevMode == OBJ_SECTORS && EditMode == OBJ_LINEDEFS)
		{
			SHORT l, sd;

			NewSel = NULL;
			for (l = 0; l < NumLineDefs; l++)
			{
				sd = LineDefs [l].sidedef1;
				assert (sd == -1  ||  (sd >= 0 && sd < NumSideDefs));
				if (sd >= 0  &&  IsSelected (Selected, SideDefs[sd].sector))
					SelectObject (&NewSel, l);
				else
				{
					sd = LineDefs [l].sidedef2;
					assert (sd == -1  ||  (sd >= 0 && sd < NumSideDefs));
					if (sd >= 0 && IsSelected (Selected, SideDefs[sd].sector))
						SelectObject (&NewSel, l);
				}
			}
			ForgetSelection (&Selected);
			Selected = NewSel;
		}

		// select all Vertices bound to the selected LineDefs
		else if (PrevMode == OBJ_LINEDEFS && EditMode == OBJ_VERTEXES)
		{
			NewSel = NULL;
			while (Selected)
			{
				SHORT n = Selected->objnum;
				assert (n >= 0 && n < NumLineDefs);
				SHORT start = LineDefs[n].start;
				SHORT end   = LineDefs[n].end;
				if ( ! IsSelected (NewSel, start) )
					SelectObject (&NewSel, start);

				if ( ! IsSelected (NewSel, end))
					SelectObject (&NewSel, end);

				UnSelectObject (&Selected, n);
			}
			Selected = NewSel;
		}