TABLE OF CONTENTS

Widgets/ListBox [ Packages ]

[ Top ] [ Widgets ] [ Packages ]

FUNCTION

 Provides code for manipulate Tk widget ListBox

SOURCE

package Tcl.Tk.Ada.Widgets.ListBox with
   SPARK_Mode
is
   pragma Elaborate_Body;

ListBox/ListBox.Tk_ListBox [ Types ]

[ Top ] [ ListBox ] [ Types ]

FUNCTION

 This is a non-abstract type derived directly from Tk_Widget.
 Each of the derived widgets redefines the Create subprogram
 in order to create the correct type of widget.

SOURCE

   type Tk_ListBox is new Tk_Widget with private;

ListBox/ListBox.Activate [ Subprograms ]

[ Top ] [ ListBox ] [ Subprograms ]

FUNCTION

 Set the active element of Tk_ListBox to the selected index.

SOURCE

   procedure Activate(ListboxWidget: in Tk_ListBox; Index: in String) with
      Pre'Class => Index /= "";

PARAMETERS

 ListboxWidget - Tk_ListBox in which element will be set as active
 Index         - Index of element to set as active

EXAMPLE

     -- Set second element as active in My_Listbox
     Activate(My_Listbox, "1");

COMMANDS

 ListboxWidget activate index

HISTORY

 8.6.4 - Added

ListBox/ListBox.BBox [ Subprograms ]

[ Top ] [ ListBox ] [ Subprograms ]

FUNCTION

 Get size of bounding box of the selected item text in the selected
 Tk_ListBox

SOURCE

   function BBox
     (ListboxWidget: in Tk_ListBox; Index: in String) return String with
      Pre'Class => Index /= "";

PARAMETERS

 ListboxWidget - Tk_ListBox which will be queried
 Index         - Index of item from which bounding box will be
                 taken

RESULT

 Four values: x1, y1 - coordinates of starting point of bounding box
 from top left, x2, y2 - coordinates of ending point from bottom right
 of bounding box.

EXAMPLE

      -- Get the bounding box of My_Listbox listbox for third element
      Bounding_Box: constant String := BBox(My_Listbox, "2");

COMMANDS

 ListboxWidget bbox index

HISTORY

 8.6.4 - Added

ListBox/ListBox.Create_(function) [ Subprograms ]

[ Top ] [ ListBox ] [ Subprograms ]

FUNCTION

 Creates a new Tk_ListBox in the specified interpreter.

SOURCE

   overriding function Create
     (pathName: in String; options: in String := "";
      Interp: in Tcl_Interp := Null_Interp) return Tk_ListBox with
      Global => null;

PARAMETERS

 pathName - Tk path (starts with dot) for the widget
 options  - Options which will be passed to the widget. Default value is
            empty
 Interp   - Tcl interpreter to which the widget will be created. If null,
            the widget will be created in the "contextual" interpreter.
            Default value is null.

RESULT

 Newly created Tk_ListBox

EXAMPLE

   -- Create a new listbox with pathname .mylistbox
   My_Listbox: constant Tk_ListBox := Create(".mylistbox");

SEE ALSO

 ListBox.Create_(procedure)

COMMANDS

 listbox pathName ?options?

HISTORY

 8.6.2 - Added

ListBox/ListBox.Create_(procedure) [ Subprograms ]

[ Top ] [ ListBox ] [ Subprograms ]

FUNCTION

 Creates a new Tk_ListBox in the specified interpreter.

SOURCE

   overriding procedure Create
     (Widgt: out Tk_ListBox; pathName: in String; options: in String := "";
      Interp: in Tcl_Interp := Null_Interp) with
      Global => null;

PARAMETERS

 Widgt    - Tk_ListBox which will be created
 pathName - Tk path (starts with dot) for the widget
 options  - Options which will be passed to the widget. Default value is
            empty
 Interp   - Tcl interpreter to which the widget will be created. If null,
            the widget will be created in the "contextual" interpreter.
            Default value is null.

OUTPUT

 Newly created Tk_ListBox as parameter Widgt

EXAMPLE

     -- Create listbox My_Listbox with pathname .mylistbox and with black background on the current Tcl interpreter
     declare
        My_Listbox: Tk_Listbox;
     begin
        Create(My_Listbox, ".mylistbox", "-background black");
     end;

SEE ALSO

 ListBox.Create_(function)

COMMANDS

 listbox pathName ?options?

HISTORY

 8.6.2 - Added

ListBox/ListBox.CurSelection [ Subprograms ]

[ Top ] [ ListBox ] [ Subprograms ]

FUNCTION

 Get the current selected items in the selected Tk_ListBox

SOURCE

   function CurSelection(ListboxWidget: in Tk_ListBox) return String;

PARAMETERS

 ListboxWidget - Tk_ListBox which will be queried for selection

RESULT

 List of numerical indices of all of the elements in ListboxWidget
 that are currently selected or {} if no elements selected.

EXAMPLE

      -- Get the current seelction in My_Listbox listbox
      Selection: constant String := CurSelection(My_Listbox);

COMMANDS

 ListboxWidget curselection

HISTORY

 8.6.4 - Added

ListBox/ListBox.Delete [ Subprograms ]

[ Top ] [ ListBox ] [ Subprograms ]

FUNCTION

 Delete the selected elements from the selected Tk_ListBox

SOURCE

   procedure Delete
     (ListboxWidget: in Tk_ListBox; First: in String;
      Last: in String := "") with
      Pre'Class => First /= "";

PARAMETERS

 ListboxWidget - Tk_ListBox in which elements will be deleted
 First         - Index of first element to delete
 Last          - Index of last element to delete. If empty, only one
                 element will be deleted. Default value is empty

EXAMPLE

   -- Delete second item from My_Listbox listbox
   Delete(My_Listbox, "1");

COMMANDS

 ListboxWidget delete first ?last?

HISTORY

 8.6.4 - Added

ListBox/ListBox.Get [ Subprograms ]

[ Top ] [ ListBox ] [ Subprograms ]

FUNCTION

 Get the content of the selected elements in the selected Tk_ListBox

SOURCE

   function Get
     (ListboxWidget: in Tk_ListBox; First: in String; Last: in String := "")
      return String with
      Pre'Class => First /= "";

PARAMETERS

 ListboxWidget - Tk_ListBox which will be queried for elements
 First         - Index of first element to get
 Last          - Index of last element to get. Default value is empty

RESULT

 If Last is empty, return only one element, marked by First argument.
 If both are present, return list of elements from First to Last. If
 no elements are in range, return {}

EXAMPLE

      -- Get the content of the second and third element in My_Listbox listbox
      Elements: constant String := Get(My_Listbox, "1", "2");

COMMANDS

 ListboxWidget get first ?last?

HISTORY

 8.6.4 - Added

ListBox/ListBox.Get_Widget [ Subprograms ]

[ Top ] [ ListBox ] [ Subprograms ]

FUNCTION

 Get the existing Tk_ListBox widget

SOURCE

   overriding function Get_Widget
     (pathName: in String; Interp: in Tcl_Interp := Get_Context)
      return Tk_ListBox with
      Global => null;

PARAMETERS

 pathName - Tk path (starts with dot) for the widget
 Interp   - Tcl interpreter on which the widget exists. Can be empty.
            Default value is current Tcl interpreter

RESULT

 Existing Tk_ListBox widget

EXAMPLE

     -- Get listbox widget with name .mylist on the current Tcl interpreter
     My_ListBox: constant Tk_ListBox := Get_Widget(".mylist");

HISTORY

 8.6.9 - Added

ListBox/ListBox.Index [ Subprograms ]

[ Top ] [ ListBox ] [ Subprograms ]

FUNCTION

 Get the index for the selected element in the selected Tk_ListBox

SOURCE

   function Index
     (ListboxWidget: in Tk_ListBox; Index: in String) return String with
      Pre'Class => Index /= "";

PARAMETERS

 ListboxWidget - Tk_ListBox which will be queried for index
 Index         - Index of the element to get

RESULT

 Numerical index of the selected element. If Index is set to "end",
 return count of numbers of the elements in the ListboxWidget

EXAMPLE

      -- Get the index of the active element in My_Listbox listbox
      ActiveIndex: constant String := Index(My_Listbox, "active");

COMMANDS

 ListboxWidget index index

HISTORY

 8.6.4 - Added

ListBox/ListBox.Insert [ Subprograms ]

[ Top ] [ ListBox ] [ Subprograms ]

FUNCTION

 Insert zero or more elements to the selected Tk_ListBox

SOURCE

   procedure Insert
     (ListboxWidget: in Tk_ListBox; Index: in String;
      Elements: in String := "") with
      Pre'Class => Index /= "";

PARAMETERS

 ListboxWidget - Tk_ListBox to which elements will be added
 Index         - Index in ListboxWidget where add the elements
 Elements      - Elements to add. Default value is empty

EXAMPLE

      -- Insert elements one and two elements at the end of the My_Listbox listbox
      Insert(My_Listbox, "end", "one two");

COMMANDS

 ListboxWidget insert index ?elements?

HISTORY

 8.6.4 - Added

ListBox/ListBox.Item_Cget [ Subprograms ]

[ Top ] [ ListBox ] [ Subprograms ]

FUNCTION

 Get the selected option of the selected item in the selected Tk_ListBox

SOURCE

   function Item_Cget
     (ListboxWidget: in Tk_ListBox; Index, Option: in String)
      return String with
      Pre'Class => Index /= "" and Option /= "";

PARAMETERS

 ListboxWidget - Tk_ListBox which will be queried for the option
 Index         - Index of the item in ListboxWidget which will be
                 queried for the option
 Option        - Tk option to get

EXAMPLE

      -- Get the background color of the second element in My_Listbox listbox
      Options := constant String := Item_Cget(My_Listbox, "1", "-background");

COMMANDS

 ListboxWidget itemcget index option

HISTORY

 8.6.4 - Added

ListBox/ListBox.Item_Configure_(function) [ Subprograms ]

[ Top ] [ ListBox ] [ Subprograms ]

FUNCTION

 Queries or modifies the configuration options of the selected item

SOURCE

   function Item_Configure
     (ListBoxWidget: in Tk_ListBox; Index: in String; Options: in String := "")
      return String with
      Pre'Class => Index /= "";

PARAMETERS

 ListBoxWidget - Tk_ListBox which will be queried or modified for options
 Index         - Index of the item which will be queried or modified
                 for options
 Options       - Options to modify or get. Can be empty. Default value
                 is empty

RESULT

 If Options is empty, return all available options and their values for
 the selected item. Otherwise, return selected option's value for the
 selected item

EXAMPLE

      -- Get the all options of the last element in the My_Listbox listbox
      Options: constant String := Item_Configure(My_Listbox, "end");

SEE ALSO

 ListBox.Item_Configure_(procedure)

COMMANDS

 ListBoxWidget itemconfigure index ?options?

HISTORY

 8.6.4 - Added

ListBox/ListBox.Item_Configure_(procedure) [ Subprograms ]

[ Top ] [ ListBox ] [ Subprograms ]

FUNCTION

 Modifies the configuration options of the selected item

SOURCE

   procedure Item_Configure
     (ListBoxWidget: in Tk_ListBox; Index, Options: in String) with
      Pre'Class => Index /= "" and Options /= "";

PARAMETERS

 ListBoxWidget - Tk_ListBox which will be modified for options
 Index         - Index of the item which options will be modified
 Options       - Options to modify.

EXAMPLE

      -- Set the background color of the third item in the My_Listbox listbox to green
      Item_Configure(My_Listbox, "2", "-background green");

SEE ALSO

 ListBox.Item_Configure_(function)

COMMANDS

 ListBoxWidget itemconfigure index options

HISTORY

 8.6.4 - Added

ListBox/ListBox.Nearest [ Subprograms ]

[ Top ] [ ListBox ] [ Subprograms ]

FUNCTION

 Get nearest element to the selected point in the selected Tk_ListBox

SOURCE

   function Nearest
     (ListboxWidget: in Tk_ListBox; Y: in String) return String with
      Pre'Class => Y /= "";

PARAMETERS

 ListboxWidget - Tk_ListBox which will be queried for the item
 Y             - Y coordinate to find the element

RESULT

 Index of the nearest to Y visible element

EXAMPLE

      -- Get the index of the element at 10px in My_Listbox listbox
      Index := constant String := Nearest(My_Listbox, "10");

COMMANDS

 ListboxWidget nearest y

HISTORY

 8.6.4 - Added

ListBox/ListBox.Scan_DragTo [ Subprograms ]

[ Top ] [ ListBox ] [ Subprograms ]

FUNCTION

 Computes the difference between its X and Y arguments and the X and Y
 arguments to the last Scan_Mark procedure for the Tk_ListBox. It then
 adjusts the view by 10 times the difference in coordinates.

SOURCE

   procedure Scan_DragTo(ListboxWidget: in Tk_ListBox; X, Y: in String) with
      Pre'Class => X /= "" and Y /= "";

PARAMETERS

 ListboxWidget - Tk_ListBox in which difference will be computed
 X             - X coordinate which difference will be computed
 Y             - Y coordinate which difference will be computed

EXAMPLE

      -- Adjust the view of My_Listbox listbox to point (12, 84)
      Scan_DragTo(My_Listbox, "12", "84");

COMMANDS

 ListboxWidget scan dragto x y

HISTORY

 8.6.4 - Added

ListBox/ListBox.Scan_Mark [ Subprograms ]

[ Top ] [ ListBox ] [ Subprograms ]

FUNCTION

 Sets starting position for scan in the selected Tk_ListBox

SOURCE

   procedure Scan_Mark(ListboxWidget: in Tk_ListBox; X, Y: in String) with
      Pre'Class => X /= "" and Y /= "";

PARAMETERS

 ListboxWidget - Tk_ListBox in which mark will be set
 X             - X coordinate of the mark to set
 Y             - Y coordinate of the mark to set

EXAMPLE

      -- Set the starting point for scan at point (10, 24) in My_Listbox listbox
      Scan_Mark(My_Listbox, "10", "24");

COMMANDS

 ListboxWidget scan mark x y

HISTORY

 8.6.4 - Added

ListBox/ListBox.See [ Subprograms ]

[ Top ] [ ListBox ] [ Subprograms ]

FUNCTION

 Make the selected element of the selected Tk_ListBox visible. If the
 element is visible, this procedure do nothing.

SOURCE

   procedure See(ListboxWidget: in Tk_ListBox; Index: in String) with
      Pre'Class => Index /= "";

PARAMETERS

 ListboxWidget - Tk_ListBox in which the selected element will be
                 visible
 Index         - Index of the element to make visible

EXAMPLE

      -- Make visible third element in My_Listbox listbox
      See(My_Listbox, "2");

COMMANDS

 ListboxWidget see index

HISTORY

 8.6.4 - Added

ListBox/ListBox.Selection_Anchor [ Subprograms ]

[ Top ] [ ListBox ] [ Subprograms ]

FUNCTION

 Set the selection anchor to the selected element in the selected
 Tk_ListBox

SOURCE

   procedure Selection_Anchor
     (ListboxWidget: in Tk_ListBox; Index: in String) with
      Pre'Class => Index /= "";

PARAMETERS

 ListboxWidget - Tk_ListBox in which anchor will be set
 Index         - Index of the element on which anchor will be set. If
                 item doesn't exists, the anchor will be set to the
                 closest item

EXAMPLE

      -- Set the selection anchor to the active element at the My_Listbox listbox
      Selection_Anchor(My_Listbox, "active");

COMMANDS

 ListboxWidget selection anchor index

HISTORY

 8.6.4 - Added

ListBox/ListBox.Selection_Clear [ Subprograms ]

[ Top ] [ ListBox ] [ Subprograms ]

FUNCTION

 Deselect elements in the Tk_ListBox between First and Last indexes

SOURCE

   procedure Selection_Clear
     (ListboxWidget: in Tk_ListBox; First: in String;
      Last: in String := "") with
      Pre'Class => First /= "";

PARAMETERS

 ListboxWidget - Tk_ListBox in which selection will be removed
 First         - Index of the first element to deselect
 Last          - Index of the last element to deselect. If empty,
                 deselect only one element. Default value is empty

EXAMPLE

      -- Deselect first element in My_Listbox listbox
      Selection_Clear(My_Listbox, "0");

COMMANDS

 ListboxWidget selection clear first ?last?

HISTORY

 8.6.4 - Added

ListBox/ListBox.Selection_Includes [ Subprograms ]

[ Top ] [ ListBox ] [ Subprograms ]

FUNCTION

 Check if the selected element is in the selection in the selected
 Tk_ListBox

SOURCE

   function Selection_Includes
     (ListboxWidget: in Tk_ListBox; Index: in String) return String with
      Pre'Class => Index /= "";

PARAMETERS

 ListboxWidget - Tk_ListBox in which the selection will be queried
 Index         - Index of the element to check if is in the selection

RESULT

 1 if the selected element is in the selection, otherwise 0

EXAMPLE

      -- Check if second element in My_Listbox listbox is selected
      Is_Selected: constant String := Selection_Includes(My_Listbox, "1");

COMMANDS

 ListboxWidget selection includes index

HISTORY

 8.6.4 - Added

ListBox/ListBox.Selection_Set [ Subprograms ]

[ Top ] [ ListBox ] [ Subprograms ]

FUNCTION

 Add the selected elements to the Tk_ListBox selection

SOURCE

   procedure Selection_Set
     (ListboxWidget: in Tk_ListBox; First: in String;
      Last: in String := "") with
      Pre'Class => First /= "";

PARAMETERS

 ListboxWidget - Tk_ListBox in which the elements will be added to
                 the selection
 First         - Index of the first element to add
 Last          - Index of the last element to add. If empty, add only
                 one element. Default value is empty

EXAMPLE

      -- Select all elements in the My_Listbox listbox
      Selection_Set(My_Listbox, "0", "end");

COMMANDS

 ListboxWidget selection set first ?last?

HISTORY

 8.6.4 - Added

ListBox/ListBox.Size [ Subprograms ]

[ Top ] [ ListBox ] [ Subprograms ]

FUNCTION

 Get amount of the elements in the selected Tk_ListBox

SOURCE

   function Size(ListboxWidget: in Tk_ListBox) return String;

PARAMETERS

 ListboxWidget - Tk_ListBox which will be queried for the elements

RESULT

 Amount of the elements in the ListboxWidget

EXAMPLE

      -- Get the amount of the elements in the My_Listbox listbox
      Elements: constant String := Size(My_Listbox);

COMMANDS

 ListboxWidget size

HISTORY

 8.6.4 - Added

ListBox/ListBox.XView_(function) [ Subprograms ]

[ Top ] [ ListBox ] [ Subprograms ]

FUNCTION

 Get which horizontal fraction of the Tk_ListBox is visible

SOURCE

   function XView(ListboxWidget: in Tk_ListBox) return String;

PARAMETERS

 ListboxWidget - Tk_ListBox which will be queried for visibility

RESULT

 Pair of elements: first element is the start of horizontal fraction of
 the ListboxWidget which is visible, second is the end of horizontal
 fraction of the ListboxWidget which is visible.

EXAMPLE

   -- Get the horizontal fraction of the My_Listbox listbox
   Horizontal_Fraction: constant String := XView(My_Listbox);

SEE ALSO

 ListBox.YView_(function), ListBox.XView_(procedure),
 ListBox.YView_(procedure)

COMMANDS

 ListboxWidget xview

HISTORY

 8.6.4 - Added

ListBox/ListBox.XView_(procedure) [ Subprograms ]

[ Top ] [ ListBox ] [ Subprograms ]

FUNCTION

 Adjusts the view in the window so that the character position given by
 index is displayed at the left edge of the window

SOURCE

   procedure XView(ListboxWidget: in Tk_ListBox; Index: in String) with
      Pre'Class => Index /= "";

PARAMETERS

 ListboxWidget - Tk_ListBox which will be adjusted
 Index         - Character index to which ListboxWidget will be adjusted.
                 Character position starts from 0

EXAMPLE

   -- Adjust the view in the My_Listbox listbox to second character index
   XView(My_Listbox, "1");

SEE ALSO

 ListBox.YView_(function), ListBox.XView_(function),
 ListBox.YView_(procedure)

COMMANDS

 ListboxWidget xview index

HISTORY

 8.6.4 - Added

ListBox/ListBox.Xview_Move_To [ Subprograms ]

[ Top ] [ ListBox ] [ Subprograms ]

FUNCTION

 Adjusts the view in the window so that fraction of the total width of
 the Tk_ListBox is off-screen to the left.

SOURCE

   procedure Xview_Move_To
     (ListboxWidget: in Tk_ListBox; Fraction: in String) with
      Pre'Class => Fraction /= "";

PARAMETERS

 ListboxWidget - Tk_ListBox which view will be adjusted
 Fraction      - Fraction of the ListboxWidget to move. Must be between 0
                 and 1

EXAMPLE

      -- Show the first half of the listbox My_Listbox
      Xview_Move_To(My_Listbox, "0.5");

SEE ALSO

 ListBox.Yview_Move_To

COMMANDS

 ListboxWidget xview moveto fraction

HISTORY

 8.6.4 - Added

ListBox/ListBox.Xview_Scroll [ Subprograms ]

[ Top ] [ ListBox ] [ Subprograms ]

FUNCTION

 Shift the view in the window on left or right according to Number and
 What.

SOURCE

   procedure Xview_Scroll
     (ListboxWidget: in Tk_ListBox; Number, What: in String) with
      Pre'Class => Number /= "" and (What = "units" or What = "pages");

PARAMETERS

 ListboxWidget - Tk_ListBox which view will be shifted
 Number        - The amount of What to shift the ListboxWidget
 What          - Type of amount to move. Can be "units" or "pages"

EXAMPLE

      -- Move the view in the My_Listbox listbox by 10 units to right
      Xview_Scroll(My_Listbox, "10", "units");

SEE ALSO

 ListBox.Yview_Scroll

COMMANDS

 ListboxWidget xview scroll number what

HISTORY

 8.6.4 - Added

ListBox/ListBox.YView_(function) [ Subprograms ]

[ Top ] [ ListBox ] [ Subprograms ]

FUNCTION

 Get which vertical fraction of the Tk_ListBox is visible

SOURCE

   function YView(ListboxWidget: in Tk_ListBox) return String;

PARAMETERS

 ListboxWidget - Tk_ListBox which will be queried for visibility

RESULT

 Pair of elements: first element is the start of vertical fraction of
 the ListboxWidget which is visible, second is the end of vertical
 fraction of the ListboxWidget which is visible.

EXAMPLE

      -- Get the vertical fraction of the My_Listbox listbox
      Vertical_Fraction: constant String := YView(My_Listbox);

SEE ALSO

 ListBox.YView_(procedure), ListBox.XView_(function),
 ListBox.XView_(procedure)

COMMANDS

 ListboxWidget yview

HISTORY

 8.6.4 - Added

ListBox/ListBox.YView_(procedure) [ Subprograms ]

[ Top ] [ ListBox ] [ Subprograms ]

FUNCTION

 Adjusts the view in the window so that the element given by index is
 displayed at the top edge of the window

SOURCE

   procedure YView(ListboxWidget: in Tk_ListBox; Index: in String) with
      Pre'Class => Index /= "";

PARAMETERS

 ListboxWidget - Tk_ListBox which will be adjusted
 Index         - Element index to which ListboxWidget will be adjusted.
                 Element position starts from 0

EXAMPLE

   -- Adjust the view in the My_Listbox listbox to show the first element
   YView(My_Listbox, "0");

SEE ALSO

 ListBox.XView_(procedure), ListBox.XView_(function),
 ListBox.YView_(procedure)

COMMANDS

 ListboxWidget yview index

HISTORY

 8.6.4 - Added

ListBox/ListBox.Yview_Move_To [ Subprograms ]

[ Top ] [ ListBox ] [ Subprograms ]

FUNCTION

 Adjusts the view in the window so that fraction of the total height of
 the Tk_ListBox is off-screen to the top.

SOURCE

   procedure Yview_Move_To
     (ListboxWidget: in Tk_ListBox; Fraction: in String) with
      Pre'Class => Fraction /= "";

PARAMETERS

 ListboxWidget - Tk_ListBox which view will be adjusted
 Fraction      - Fraction of the ListboxWidget to move. Must be between 0
                 and 1

EXAMPLE

      -- Show the first half of the listbox My_Listbox
      Yview_Move_To(My_Listbox, "0.5");

SEE ALSO

 ListBox.Xview_Move_To

COMMANDS

 ListboxWidget yview moveto fraction

HISTORY

 8.6.4 - Added

ListBox/ListBox.Yview_Scroll [ Subprograms ]

[ Top ] [ ListBox ] [ Subprograms ]

FUNCTION

 Shift the view in the window on up or down according to Number and
 What.

SOURCE

   procedure Yview_Scroll
     (ListboxWidget: in Tk_ListBox; Number, What: in String) with
      Pre'Class => Number /= "" and (What = "units" or What = "pages");

PARAMETERS

 ListboxWidget - Tk_ListBox which view will be shifted
 Number        - The amount of What to shift the ListboxWidget
 What          - Type of amount to move. Can be "units" or "pages"

EXAMPLE

      -- Move the view in the My_Listbox listbox by 10 units to top
      Yview_Scroll(My_Listbox, "-10", "units");

SEE ALSO

 ListBox.Xview_Scroll

COMMANDS

 ListboxWidget yview scroll number what

HISTORY

 8.6.4 - Added