# hierarchy - Create and manipulate a hierarchy widget

## SYNOPSIS

hierarchy pathName ?options?

## INHERITANCE

itk::Widget <- Labeledwidget <- Scrolledwidget <- Hierarchy

## STANDARD OPTIONS

activeBackground cursor highlightThickness | activeForeground disabledForeground relief | background foreground selectBackground | borderWidth highlightColor selectForeground

See the "options" manual entry for details on the standard options.

## ASSOCIATED OPTIONS

activeRelief | elementBorderWidth | jump | troughColor

See the "scrollbar" widget manual entry for details on the above associated options.

spacing1 | spacing2 | spacing3 | tabs

See the "text" widget manual entry for details on the above associated options.

## INHERITED OPTIONS

labelBitmap labelPos | labelFont labelText | labelImage labelVariable | labelMargin

See the "labeledwidget" class manual entry for details on the inherited options.

## WIDGET-SPECIFIC OPTIONS

    Name:                   alwaysQuery
    Class:                  AlwaysQuery
    Command-Line Switch:	-alwaysquery

Boolean flag which tells the hierarchy widget weather or not each refresh of the display should be via a new query using the command value of the -querycommand option or use the values previous found the last time the query was made. The default is no.

    Name:                   closedIcon
    Class:                  Icon
    Command-Line Switch:	-closedicon

Specifies the name of an existing closed icon image to be used in the hierarchy before those nodes that are collapsed. Should one not be provided, then a folder icon will be generated, pixmap if possible, bitmap otherwise.

    Name:                   expanded
    Class:                  Expanded
    Command-Line Switch:	-expanded

When true, the hierarchy will be completely expanded when it is first displayed. A fresh display can be triggered by resetting the -querycommand option. The default is false.

    Name:                   filter
    Class:                  Filter
    Command-Line Switch:	-filter

When true only the branch nodes and selected items are displayed. This gives a compact view of important items. The default is false.

    Name:                   height
    Class:                  Height
    Command-Line Switch:	-height

Specifies the height of the hierarchy as an entire unit. The value may be specified in any of the forms acceptable to Tk_GetPixels. Any additional space needed to display the other components such as labels, margins, and scrollbars force the hierarchy to be compressed. A value of zero along with the same value for the width causes the value given for the visibleitems option to be applied which administers geometry constraints in a different manner. The default height is zero.

    Name:                   iconCommand
    Class:                  Command
    Command-Line Switch:	-iconcommand

Specifies a command to be executed upon user selection via mouse button one of any additional icons given in the values returned by the command associated with the -querycommand option. If this command contains "%n", it is replaced with the name of the node the icon belongs to. Should it contain "%i" then the icon name is substituted.

    Name:                   markBackground
    Class:                  Foreground
    Command-Line Switch:	-markbackground

Specifies the background color to use when displaying marked nodes.

    Name:                   markForeground
    Class:                  Background
    Command-Line Switch:	-markforeground

Specifies the foreground color to use when displaying marked nodes.

    Name:                   menuCursor
    Class:                  Cursor
    Command-Line Switch:	-menucursor

Specifies the mouse cursor to be used for the item and background menus. The value may have any of the forms accept able to Tk_GetCursor.

    Name:                   nodeIcon
    Class:                  Icon
    Command-Line Switch:	-nodeicon

Specifies the name of an existing node icon image to be used in the hierarchy before those nodes that are leafs. Should one not be provided, then a dog-eared page icon will be generated, pixmap if possible, bitmap otherwise.

    Name:                   openIcon
    Class:                  Icon
    Command-Line Switch:	-openicon

Specifies the name of an existing open icon image to be used in the hierarchy before those nodes that are expanded. Should one not be provided, then an open folder icon will be generated, pixmap if possible, bitmap otherwise.

    Name:                   queryCommand
    Class:                  Command
    Command-Line Switch:	-querycommand

Specifies the command executed to query the contents of each node. If this command contains "%n", it is replaced with the name of the desired node. In its simpilest form it should return the children of the given node as a list which will be depicted in the display. Since the names of the children are used as tags in the underlying text widget, each child must be unique in the hierarchy. Due to the unique requirement, the nodes shall be reffered to as uids or uid in the singular sense. The format of returned list is

{uid [uid ...]}

where uid is a unique id and primary key for the hierarchy entry

Should the unique requirement pose a problem, the list returned can take on another more extended form which enables the association of text to be displayed with the uids. The uid must still be unique, but the text does not have to obey the unique rule. In addition, the format also allows the specification of additional tags to be used on the same entry in the hierarchy as the uid and additional icons to be displayed just before the node. The tags and icons are considered to be the property of the user in that the hierarchy widget will not depend on any of their values. The extended format is

{{uid [text [tags [icons]]]} {uid [text [tags [icons]]]} ...}

where uid is a unique id and primary key for the hierarchy entry text is the text to be displayed for this uid tags is a list of user tags to be applied to the entry icons is a list of icons to be displayed in front of the text

The hierarchy widget does a look ahead from each node to determine if the node has a children. This can be cost some performace with large hierarchies. User's can avoid this by providing a hint in the user tags. A tag of "leaf" or "branch" tells the hierarchy widget the information it needs to know thereby avoiding the look ahead operation.

    Name:                   hscrollMode
    Class:                  ScrollMode
    Command-Line Switch:	-hscrollmode

Specifies the the display mode to be used for the horizontal scrollbar: static, dynamic, or none. In static mode, the scroll bar is displayed at all times. Dynamic mode displays the scroll bar as required, and none disables the scroll bar display. The default is static.

    Name:                   sbWidth
    Class:                  Width
    Command-Line Switch:	-sbwidth

Specifies the width of the scrollbar in any of the forms acceptable to Tk_GetPixels.

    Name:                   scrollMargin
    Class:                  Margin
    Command-Line Switch:	-scrollmargin

Specifies the distance between the text portion of the hierarchy and the scrollbars in any of the forms acceptable to Tk_GetPixels. The default is 3 pixels.

    Name:                   textBackground
    Class:                  Background
    Command-Line Switch:	-textbackground

Specifies the background color for the text portion of the hierarchy in any of the forms acceptable to Tk_GetColor.

    Name:                   textFont
    Class:                  Font
    Command-Line Switch:	-textfont

Specifies the font to be used in the text portion of the hierarchy.

    Name:                   visibleitems
    Class:                  VisibleItems
    Command-Line Switch:	-visibleitems

Specifies the widthxheight in characters and lines for the hierarchy. This option is only administered if the width and height options are both set to zero, otherwise they take precedence. The default value is 80x24. With the visibleitems option engaged, geometry constraints are maintained only on the text portion of the hierarchy. The size of the other components such as labels, margins, and scroll bars, are additive and independent, effecting the overall size of the hierarchy. In contrast, should the width and height options have non zero values, they are applied to the hierarchy as a whole. The hierarchy is compressed or expanded to maintain the geometry constraints.

    Name:                   vscrollMode
    Class:                  ScrollMode
    Command-Line Switch:	-vscrollmode

Specifies the the display mode to be used for the vertical scrollbar: static, dynamic, or none. In static mode, the scroll bar is displayed at all times. Dynamic mode displays the scroll bar as required, and none disables the scroll bar display. The default is static.

    Name:                   width
    Class:                  Width
    Command-Line Switch:	-width

Specifies the width of the hierarchy as an entire unit. The value may be specified in any of the forms acceptable to Tk_GetPixels. Any additional space needed to display the other components such as labels, margins, and scrollbars force the text portion of the hierarchy to be compressed. A value of zero along with the same value for the height causes the value given for the visibleitems option to be applied which administers geometry constraints in a different manner. The default width is zero.

## DESCRIPTION

The hierarchy command creates a hierarchical data view widget. It allows the graphical management of a a list of nodes that can be expanded or collapsed. Individual nodes can be highlighted. Clicking with the right mouse button on any item brings up a special item menu. Clicking on the background area brings up a different popup menu. Options exist to provide user control over the loading of the nodes and actions associated with node selection. Since the hierarchy is based on the scrolledtext widget, it includes options to control the method in which the scrollbars are displayed, i.e. statically or dynamically. Options also exist for adding a label to the hierarchy and controlling its position.

## METHODS

The hierarchy command creates a new Tcl command whose name is pathName. This command may be used to invoke various operations on the widget. It has the following general form:

    pathName option ?arg arg ...?

Option and the args determine the exact behavior of the command. The following commands are possible for hierarchy widgets:

## ASSOCIATED METHODS

bbox dlineinfo insert tag | compare dump scan window | debug get search xview | delete index see yview

See the "text" manual entry for details on the standard methods.

## WIDGET-SPECIFIC METHODS

pathName cget option

  Returns the current value of the configuration option given by option. Option may have any of the values accepted by the hierarchy command.
  pathName clear
    Removes all items from the hierarchy display including all tags and icons. The display will remain empty until the -filter or -querycommand options are set.
  pathName collapse uid
    Collapses the hierarchy beneath the node with the specified unique id by one level. Since this can take a moment for large hierarchies, the cursor will be changed to a watch during the collapse. Also, if any of the nodes beneath the node being collapsed are selected, their status is changed to unselected.
  pathName configure ?option? ?value option value ...?
    Query or modify the configuration options of the widget. If no option is specified, returns a list describing all of the available options for pathName (see Tk_ConfigureInfo for information on the format of this list). If option is specified with no value, then the command returns a list describing the one named option (this list will be identical to the corresponding sublist of the value returned if no option is specified). If one or more option-value pairs are specified, then the command modifies the given widget option(s) to have the given value(s); in this case the command returns an empty string. Option may have any of the values accepted by the hierarchy command.
  pathName current
    Returns the tags for the node that was most recently selected by the right mouse button when the item menu was posted. Usually used by the code in the item menu to figure out what item is being manipulated.
  pathName draw ?when?
    Performs a complete redraw of the entire hierarchy. When may be either -now or -eventually where the latter means the draw can be performed after idle.
  pathName expand uid
    Expands the hierarchy beneath the node with the specified unique id by one level. Since this can take a moment for large hierarchies, the cursor will be changed to a watch during the expansion.
  pathName mark option ?arg arg ...?
    This command is used to manipulate marks which is quite similar to selection, adding a secondary means of hilighting an item in the hierarchy. The exact behavior of the command depends on the option argument that follows the mark argument. The following forms of the command are currently supported:
  pathName mark clear
    Clears all the currently marked nodes in the hierarchy.
  pathName mark add uid ?uid uid ...?
    Marks the nodes with the specified uids in the hierarchy using the -markbackground and -markforeground options and without affecting the mark state of any other nodes that were already marked.
  pathName mark remove uid ?uid uid ...?
    Unmarks the nodes with the specified uids in the hierarchy without affecting the mark state of any other nodes that were already marked.
  pathName mark get
    Returns a list of the unique ids that are currently marked.
  pathName refresh uid
    Performs a redraw of a specific node that has the given uid. If the node is not currently visible or in other words already drawn on the text, then no action is taken.
  pathName prune uid
    Removes the node specified by the given uid from the hierarchy. Should the node have children, then all of its children will be removed as well.
  pathName selection option ?arg arg ...?
    This command is used to manipulate the selection of nodes in the hierarchy. The exact behavior of the command depends on the option argument that follows the selection argument. The following forms of the command are currently supported:
  pathName selection clear
    Clears all the currently selected nodes in the hierarchy.
  pathName selection add uid ?uid uid ...?
    Selects the nodes with the specified uids in the hierarchy using the -selectionbackground and -selectionforeground options and without affecting the selection state of any other nodes that were already selected.
  pathName selection remove uid ?uid uid ...?
    Deselects the nodes with the specified uids in the hierarchy without affecting the selection state of any other nodes that were already selected.
  pathName selection get
    Returns a list of the unique ids that are currently selected.
  A nodes selection status is also dependent on it being visible. If a node is selected and its parent is then collapsed making the selected node not visible, then its selection status is changed to unselected.
  pathName toggle uid
    Toggles the hierarchy beneath the node with the specified unique id. If the hierarchy is currently expanded, then it is collapsed, and vice-versa.

  ## COMPONENTS

      Name:                   list
      Class:                  Text

  The list component is the text widget in which the hierarchy is displayed. See the "text" widget manual entry for details on the text component item.

      Name:                   bgMenu
      Class:                  Menu

  The bgMenu component is the popup menu which is displayed upon pressing the right mouse button in the background, i.e. not over a specific node. Menu items can be added along with their commands via the component command. See the "menu" widget manual entry for details on the bgMenu component item.

      Name:                   horizsb
      Class:                  Scrollbar

  The horizsb component is the horizontal scroll bar. See the "scrollbar" widget manual entry for details on the horizsb component item.

      Name:                   itemMenu
      Class:                  Menu

  The itemMenu component is the popup menu which is displayed upon selection of a hierarchy node with the right mouse button. Menu items can be added along with their commands via the component command. See the "menu" widget manual entry for details on the itemMenu component item.

      Name:                   vertsb
      Class:                  Scrollbar

  The vertsb component is the vertical scroll bar. See the "scrollbar" widget manual entry for details on the vertsb component item.

  ## EXAMPLE

      proc get_files {file} {
          global env

          if {$file == ""} {
              set dir $env(HOME)
          } else {
              set dir $file
          }

          if {[catch {cd $dir}] != 0} {
              return ""
          }

          set rlist ""

          foreach file [lsort [glob -nocomplain *]] {
              lappend rlist [list [file join $dir $file] $file]
          }

          return $rlist
      }

      hierarchy .h -querycommand "get_files %n" -visibleitems 30x15 \
          -labeltext $env(HOME)
      pack .h -side left -expand yes -fill both

  ## AUTHOR

  Mark L. Ulferts Michael J. McLennan

  ## KEYWORDS

  hierarchy, text, widget