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