//$RL/src/dobuttonevent.txt 261Lines, RJL041013
//This is an extract from buttonevent.cc, callback from X11 GUI in bde/src.
// It includes all except first ~150 rev. history and declarations.

void dobuttonevent(Widget w, XtPointer c, XEvent *xevent, Boolean *)
{
    /* attr contains the attributes for the event.  NodeEvents should
       use the node field, link events should use the link field, etc. */
/* TBD: segregate/partition into Node/Link/Caption/Text-ops.cc -RJL)40918*/	
    //  CG: All attributes have been converted to upper case and have
    //  prefixes NA_, LA_, BA_, TA, GA_ and CA_. 

    union {
	node_attributes node;
	link_attributes link;
	bpt_attributes bpt;
	text_attributes text;
	graph_attributes graph;
        caption_attributes caption; // Added by 94FBDE Javier / Kathy / Lon
    } attr;
    int button_op = (int)c;	
	// warning from cxx: conversion from ptr to smaller int - RJL 011203

    XButtonEvent *event = &xevent->xbutton;
    
	/* no graph operations are allowed if there is no
	   current graph unless creating a new graph */
    if (GraphIsDisplayed || ( selected.getstate() == SGrph_create ) )
      {
      switch (selected.getstate()) {

// Merged six shape cases into SNodeCreate.
// Deleted case SCircle, SEllipse, SRectangle, SInput, SOutput, and SFile
//add a new state SCnode to create a node by clicking one of six nodeshapes or
//use default nodeshape which is rectangle - cychang & phsia
//Resorted state by OOMenu class category and *ops.cc file - RJL040919

// nodeops.cc: Node Create/Delete/Resize/Move:
		case SCnode:
			node_create(event, button_op);
			break;
		case SBpt:
			break;

       	        case SDnode1:
	        case SDnode2:        // redefined by hcpatel & mmaliset
			node_delete(event,  
				selected.getstate(), 
				&(attr.node), 
				button_op);
			break;

                case SResize:
   	        case SResize_node:
                        node_resize(event,
                                selected.getstate(),
                                &(attr.node),
                                button_op);
                        break;

	        case SMove:
			node_move(event,  
				selected.getstate(), 
				&(attr.node), 
				button_op);
			break;

//textops.cc: Text Create/Delete/Move:
		case SCtxt:
		case SCtxt_create:
		case SCtxt_isCurr:
		//Why BOTH states call text_create? OK if repeat switch there.
			text_create(event, 
				selected.getstate(),
				&(attr.text), 
				button_op);
			break;

		case SDtxt:
		case SDtxt_delete:
			text_delete(event, 
				selected.getstate(),
				&(attr.text), 
				button_op);
			break;

		case SMtxt:
		case SMtxt_move:
			text_move(event, 
				selected.getstate(),
				&(attr.text), 
				button_op);
			break;


// graphops.cc:  Graph Create/Delete/Select
		case SGrph_create:
			graph_create(event, 
				     selected.getstate(),
				     &(attr.graph), 
			  	     button_op);
			break;

		case SGrph_delete:
			graph_delete(event, 
				     selected.getstate(),
				     &(attr.graph), 
			  	     button_op);
			break;

		case SGrph_select:
			graph_select(event, 
				     selected.getstate(),
				     &(attr.graph), 
			  	     button_op);
			break;


//captionops.cc:
		case SCaptionCreate:
			caption_create(event, 
				       selected.getstate(),
				       &(attr.caption), 
			  	       button_op);	
                        break;

		case SCaptionDelete:
		case SCaptionConfirmDelete:
			caption_delete(event, 
				       selected.getstate(),
				       &(attr.caption), 
			  	       button_op);
                        break;

	        case SCaptionMove:
			caption_move(event, 
				   selected.getstate(),
				   &(attr.caption), 
			  	   button_op);
                        break;

 	        case SCaptionResize:
	        case SCaptionConfirmResize:
			caption_resize(event, 
				       selected.getstate(),
				       &(attr.caption), 
			  	       button_op);
			break;
		// end button events for caption object  Added by 94FBDE  Javier/Kathy/Lon


// bendptops.cc: Bendpt Create/Delete/Move
		case SBpt1: 
		case SBpt_create:
			bpt_create(event, 
				selected.getstate(), 
				&(attr.bpt), 
				button_op);
			break;

		case SBpt2:
		case SBpt_del:
			bpt_delete(event, 
				selected.getstate(), 
				&(attr.bpt), 
				button_op);
			break;

		case SBpt3:
		case SBpt_move:
			bpt_move(event, 
				selected.getstate(), 
				&(attr.bpt), 
				button_op);
			break;


//linkops.cc: Link Create/changeAttr?/Reverse/Delete
		case SArrow:
			link_create(event, 
				selected.getstate(), 
				&(attr.link), 
				button_op);
			break;

/* 	        case SDirection:
                        link_direction(event,
                                selected.getstate(),
                                &(attr.link),
                                button_op);
                        ReDraw();
                        break;
*/

                case SRlink_Att1: // 96subde: fjara, ianandak
                case SRlink_Att2: // for link restylE
                        link_changeAtt (event,
                                selected.getstate(),
                                &(attr.link),
                                button_op);
                        break;

   	        case SReverse:  
	        case SReverse_Arrow:
                        reverse_arrow(event,
                                selected.getstate(),
                                &(attr.link),
                                button_op);
                        break;

	        case SDlink1:        // added by hcpatel & mmaliset
	        case SDlink2:
                       link_delete(event, 
				selected.getstate(),
				&(attr.link),
				button_op); 
                       break;

// Unimplemented operations: 
                case SSelect: 
                case SStxt:
	        case SBpt_select:
                case SArrow_move: 
		case SArrow_select: 
	        case SRestyle_node:
	        case SRtxt:
	        case SBpt_restyle:
	        case SArrow_restyle:
	        case SGrph_restyle:

			/* only display error message on button down
			   not on button up */
                    if ( button_op == BUTTON_DOWN_EVENT )
		      {
                      changeCanvasCursor( arrow );
                      DisplayErrorMsg( toplevel, 
			              "Current state NOT Implemented!",
                                       (void (*)()) NULL,
                                       (XtPointer) NULL );
		      }
                      break;

		case SIdentifier:
		case SAttrib:
		case SHelp:
		case NState:
			break;
	} // end  if GraphIsDisplayed||state == SGrph_create
    }  // end switch(selected.getstate())

		/* If a button is pressed, then it can also be released.
		   Only want to display this error message once though */
    else if ( button_op == BUTTON_DOWN_EVENT )
    { 
		/* make sure cursor is arrow.  It could be pirate
		   if last action was delete */
     changeCanvasCursor( arrow );

     //WHY display this in ALL cases? - RJL)40918
     DisplayErrorMsg( toplevel, "A graph does not exist!", (void (*)()) NULL,
                      (XtPointer) NULL );
     } // end if ... else
}  // end dobuttonevent