/***************************************************************************/
/***************************************************************************/
/*                                                                         */
/*   (c) 1995-1999.  The Regents of the University of California.  All     */
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/*   This software was prepared as an account of work sponsored by an      */
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/***************************************************************************/
/***************************************************************************/

#include <Xm/Xm.h>
#include "xdir.h"

static int operation_in_progress = False;
static int controls_are_grey;

extern int search_complete;
extern struct dirwin_st *dirwin_head;

void enable_controls();

/*
 * start_op - This function must be called at the start of each
 *            operation to prevent the possibility of the user
 *            invoking a new operation while one is still in
 *            progress.  If "grey" is "True", grey out directory
 *            window controls.  If an operation is already in
 *            progress, this function beeps and returns False,
 *            otherwise True is returned.  At the end of an
 *            operation, end_op() must be called.
 */
start_op(grey)
int grey;
{
	/* Is there an operation already in progress */
	if (operation_in_progress) {
		beep();
		return False;
	}

	/* If requested, grey out directory window controls */
	if (grey)
		enable_controls(False);

	/* The operation is in progress */
	operation_in_progress = True;
	controls_are_grey = grey;

	return True;
}


/*
 * end_op - This function must be called at the end of each operation
 *          to prevent the possibility of the user invoking a new
 *          operation while one is still in progress.  start_op()
 *          must be called at the start of each operation.
 */
void
end_op()
{
	/* Sanity check */
	if (!operation_in_progress)
		fatal_error("Bug in end_op()");

	/* If directory window controls are greyed out, reenable them */
	if (controls_are_grey)
		enable_controls(True);

	/* The operation is complete */
	operation_in_progress = False;
}


/*
 * update_dir_controls - Set the sensitivity of directory controls.
 */
void
update_dir_controls()
{
    struct dirwin_st *dirwin = dirwin_head;
	int i;
	int viewable = False;

	/* Set sensitivity of controls that operate on selected entries */
	while (dirwin) {
	    if (dirwin->has_selection && has_selected_entries(dirwin)) {
	        XtSetSensitive(dirwin->w_deleteItem, True);
			XtSetSensitive(dirwin->w_renameItem, True);
	        XtSetSensitive(dirwin->w_deleteButton, True);
			for (i=0; i<dirwin->nentries; i++) {
				if (dirwin->entries[i].state == SELECTED) {
					switch (dirwin->entries[i].type) {
					case UNKNOWN_TYPE:
					case FILE_TYPE:
					case LINK_TYPE:
					case EXECUTABLE_TYPE:
						viewable = True;
					}
				}
			}
			XtSetSensitive(dirwin->w_viewItem, viewable);
	    } else {
	        XtSetSensitive(dirwin->w_deleteItem, False);
			XtSetSensitive(dirwin->w_renameItem, False);
	        XtSetSensitive(dirwin->w_deleteButton, False);
			XtSetSensitive(dirwin->w_viewItem, False);
	    }
		if (search_complete)
			XtSetSensitive(dirwin->w_searchAgainItem, False);
		else
			XtSetSensitive(dirwin->w_searchAgainItem, True);
		dirwin = dirwin->next;
	}
}


/*
 * enable_controls - If "enable" is FALSE, certain controls that should
 *                   not be used during deletions are turned off. If
 *                   "enable" is TRUE, these controls are turned back on.
 */
void
enable_controls(enable)
int enable;
{
	struct dirwin_st *dirwin = dirwin_head;

	while (dirwin) {
		XtSetSensitive(dirwin->w_dirMenuBar, enable);
		XtSetSensitive(dirwin->w_urButton, enable);
		XtSetSensitive(dirwin->w_toolbarForm, enable);
		update_layout_mode_buttons(dirwin);
		XtSetSensitive(dirwin->w_scrolledWindow, enable);
		dirwin = dirwin->next;
	}
}


/*
 * op_in_progress - Returns True if an operation is in progress, else False.
 */
op_in_progress()
{
	return operation_in_progress;
}