NAME

       canvas::tag - Easier management of the tags on canvas items or item groups

SYNOPSIS

       package require Tcl  8.5

       package require Tk  8.5

       package require canvas::tag  ?0.1?

       ::canvas::tag append canvas tagOrId tag...

       ::canvas::tag prepend canvas tagOrId tag...

       ::canvas::tag append canvas tagOrId index tag...

       ::canvas::tag remove canvas tagOrId tag...

       ::canvas::tag match canvas tagOrId pattern

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DESCRIPTION

       This  package  provides utility commands for easier management of the tag lists associated
       with canvas items or item groups.

       The problem with the existing canvas API is that a tag list can only be set  as  a  whole,
       making  adding  and removing of tags from such lists relatively complex operations reading
       the current tag list, modifying it, and then writing the changed list back.

       The commands provided by this package hide all this complexity from the user.

API

       ::canvas::tag append canvas tagOrId tag...
              This command adds the tags tag... to the tag list for the items identified  by  the
              tagOrId in the canvas widget. The new tags are added at the end of the list.

              The result of the command is the empty string.

       ::canvas::tag prepend canvas tagOrId tag...
              This  command  adds the tags tag... to the tag list for the items identified by the
              tagOrId in the canvas widget. The new tags are added at the beginning of the list.

              The result of the command is the empty string.

       ::canvas::tag append canvas tagOrId index tag...
              This command adds the tags tag... to the tag list for the items identified  by  the
              tagOrId  in  the  canvas  widget.  The  new tags are inserted before the element at
              index.

              index 0 refers to the beginning of the list.

              index end refers to after the end of the list.

              The result of the command is the empty string.

       ::canvas::tag remove canvas tagOrId tag...
              This command removes the named  tags  tag...  from  the  tag  list  for  the  items
              identified by the tagOrId in the canvas widget.

              The result of the command is the empty string.

       ::canvas::tag match canvas tagOrId pattern
              This  command  finds all tags for the items identified by the tagOrId in the canvas
              widget which match the glob pattern.

              The result of the command is a list of the matching tags. Which may be empty.

KEYWORDS

       append tag, canvas, insert tag, remove tag, tags