XxExt18LIst(3x)XxExt18LIst(3x)NAME
The Internationalized Extended List widget
SYNOPSIS
#include <Xm/Ext18List.h>
DESCRIPTION
This widget contains a multi-column list with headers along the top and
a search area along the bottom. The list has scrollbars along the right
and bottom edges that allow vertical and horizontal scrolling both by
column and by pixel. The portion of the list data that is currently
visible can be altered by scrollbar actions, widget resource setting
and the redisplay of the list data after a string search has been suc‐
cessful. The sorting of elements within a particular column is also
supported. To sort the list by the elements in a given column, select
the column's title.
To search for a particular string in the list, type the string value to
be searched for in the list's associated text field and then press the
"Find" pushbutton. The search for the string begins in the currently
selected row, after the location of the previously searched for string,
or at the first column and first row if there is no column selected.
If the string is not found in that row, then the search continues
through all rows after and then before, the currently selected row. If
the string is found, the display of the list is adjusted to make the
string visible. If the string was not found, or if the string is visi‐
ble, the application will issue a warning beep.
Pointer button one allows the user to select a row or a column for
sorting. The callbacks on the doubleClickCallback list are called when
the user double clicks pointer button one. If the list data can contain
a row pixmap to display at the extreme left of the row.
Normal Resources
Name Class Type Default
columnTitles ColumnTitles String * NULL
doubleClickCallback Callback Callback NULL
entryData EntryData Xm18RowInfo* NULL
findLabel XmString XmString Find
firstColumn FirstLocation short 0
firstColumnPixmaps FirstColumnPixmaps Boolean False
firstRow FirstLocation short 0
fontList FontList FontList "fixed"
height Dimension VerticalDimension 300
numColumns NumColumns short 0
numRows NumRows short 0
selectedColumn SelectedColumn short 0
selectionPolicy SelectionPolicy SelectionPolicy XmEXTENDED_
SELECT
showFind boolean boolean True
singleSelection Callback Callback NULL
sortFunctions Function Function NULL
title Title String name of
widget
width Dimension Horizontal Dimension
All resource names begin with XmN and all resource class names begin
with XmC.
columnTitles
This is an array of length numColumns of strings displayed at the top
of each column. The data is allocated and maintained by the client.
doubleClickCallback
All routines in this list will be called whenever the user double
clicks on a row in the list.
entryData
This resource is the data associated with each row in the list. The
data is an array of Xm18RowInfo structures of length numRows allocated
by the client. The data is allocated and maintained by the client. The
Xm18RowInfo structure is defined below.
findLabel
The label to be shown on the find button.
firstColumn
This resource allows the client to adjust the current view of the list
data to have a new top left column location. When setting this
resource, firstRow should also be updated.
firstColumnPixmaps
This resource specifies that the pixmap stored in the row info struc‐
ture should be used instead of Xm18RowInfo values[0]. If pixmaps are
present, the rows may be dragged by pressing on the pixmap with pointer
button three. If this resource is True, then values[0] is never refer‐
enced. If False, then the Xm18RowInfo data pixmap is never referenced.
firstRow
This resource allows the client to adjust the current view of the list
data to have a new top left row location. When setting this resource,
firstColumn should also be updated.
fontList
This is an OSF/Motif style font list. The first font in this list will
be used to display all text in the Extended List widget. The Extended
List widget currently supports only one font.
height
This is the overall height value assigned to the Extended List widget.
Modifying this resource will affect scrollbar size and location.
numColumnsnumRows
These resources specify the number of columns and rows the widget
expects to display. These resources are used as the maximum indices for
many of the other resources in this widget. Care should be taken when
modifying these resources to ensure that the other values have also
been modified.
selectedColumn
This is the index of the currently selected column. This also the col‐
umn by which the list is being sorted.
selectionPolicy
Defines the interpretation of the select action. This resource can have
the values XmSINGLE_SELECT or XmEXTENDED_SELECT. Other values result in
undefined behavior.
showFind
This boolean manages and unmanages the find button
singleSelectionCallback
All routines in this list will be called whenever the user clicks on a
line in the list. A pointer to the Xm18RowInfo structure corresponding
to the line selected is passed as call_data. If in extended select mode
the value of call_data is undefined.
sortFunctions
This is an array of functions, one for each column, called to determine
the ordering of the rows in the column, similar to qsort.
title
This is the title that is displayed at the top of the Extended List
widget. If this value is NULL, the title area will not be shown.
width
This is the overall width value assigned to the Extended List widget.
Modifying this resource will affect scrollbar size and location.
Specifying Children Resources
The Extended List widget is composed of many simple widgets. In order
to achieve full functionality of the Toolkit, it is sometimes desirable
to set attribute values directly on those widgets. The widget ids of
the sub-widgets can be obtained by using the XtNameToWidget() function
provided by the Xt Intrinsics.
XmExt18List <named by application>
XmLabel title
XmScrollbar vertBar
XmScrollBar horizBar
XmFrame frame
XmPushButton find
XmText findText
Using the Resource Database
The Extended List widget is actually a collection of pieces. It pro‐
vides the geometry layout for the collection as well as tying together
the pieces to form a consistent package. Many of the resources that
are documented as being part of the Extended List widget are really
part of the internal list sub-component. The Extended List widget will
pass these values through to the proper child when they are set at time
of creation or with XtSetValues or XtGetValues. However, when setting a
resource via the resource database you must use either the name of the
child or the general specification (*) rather than the specific one
(.).
The Xm18RowInfo Structure
The Xm18RowInfo structure is used to contain the entryData associated
with each Row in the Extended List.
typedef struct _Xm18RowInfo{
/*
* Used by the IList widget
*/
String * values;/* The array of column strings */
Pixmap pixmap;/* mini-icon pixmaps. */
Boolean selected;/* row selected. */
/*
* Provided for the convenience of the application programmer
*/
short * sort_id;
XtPointer data;
/*
* Private to the Extended List widget (do not modify these)
*/
short pix_width;/* of the pixmap. */
short pix_height;/* of the pixmap. */
short pix_depth;/* of the pixmap. */
Boolean old_sel_state;
} Xm18RowInfo;
values This is an array of strings of length numColumns which
represents the strings displayed in each column of this
row. The data is allocated and maintained by the client.
If firstColumnPixmaps is True, then value[0] is never
referenced.
pixmap This is the pixmap displayed to the left of this row. If
firstColumnPixmaps is True then this value is never ref‐
erenced and mayn remain unset. If no pixmap is desired
for this row, even though firstColumnPixmaps is True,
set the value of pixmap to None. Color pixmaps may be
used.
sort_id This is provided for the convenience of the client and
is expected to be used as a sort index for this row. One
value should be specified for each column of the row.
See "sortFunctions" below for details.
data This is provided for the convenience of the client and
may be used for any purpose. It is intended to be used
as an identifier for the object pointed to by this row
selected This value is True if this row is selected; may be set
by the application.
Neither sort_id nor data are used by the Extended List widget; they
exist solely for the convenience of the programmer.
Translations and Actions
The following are the default translation bindings used by the icon
button:
~Ctrl ~Shift <Btn1Down>: ButtonDown()
Ctrl ~Shift <Btn1Down>: ButtonDown(Toggle)
~Ctrl Shift <Btn1Down>: ButtonDown(Extend)
Button1 <Motion>: Motion()
<Btn1Up>: ButtonUpOrLeave()
The following actions are supported by the icon button:
ButtonDown(type)
Processes a button press action that may begin with either a select or
a double click. The type argument can be either Toggle or Extend. These
values determine which mode of an extended select will be initiated on
this button event. Consult the OSF/Motif Style Guide for details.
Motion()
Processes motion events to allow the selection region to be modified
when in extended selection mode. It is assumed that this action is
called between a ButtonDown() and ButtonUpOrLeave() action.
ButtonUpOrLeave()
Cleans up after ButtonDown() and Motion().
Callback Routines
All procedures on the Extended List's singleSelectionCallback and dou‐
bleClickCallback lists will have a pointer to a Xm18RowInfo structure
passed to them in the call_data field. This structure is defined above.
Note: if a single SelectionCallback is registered on an extended list
in extended_se- lect_mode, the value of call_data is undefined.
void (callback)(Widget w, XtPointer client_data, XtPointer call_data)
w the Extended List widget
client_data the client data specified by the application
call_data a pointer to an Xm18RowInfo structure corrsponding the
the row selected
Sort Function
typedef int (Xm18SortFunction) (short column, Xm18RowInfo * row1,
Xm18RowInfo * row2);
column the column currently being sorted
row1, row2 the two rows being compared. The return value must be an
integer less than, equal to, or greater than 0, depend‐
ing on whether the first argument is less than, equal
to, or greater than the second.
Convenience RoutinesXmExt18ListGetSelectedRows
Xm18RowInfo ** XmExt18ListGetSelectedRows (Widget w)
w extended list widget
Use the XmExt18ListGetSelectedRows function to find the rows that cur‐
rently are selected in an extended list. The Xm18RowInfo ** returned by
this function contains a NULL terminated array of Xm18RowInfo pointers.
The calling routine is responsible for freeing the returned pointer
with XtFree(). The function will return NULL if no elements are
selected.
XmCreateExtended18List
Widget XmCreateExtended18List(Widget parent, String name,
ArgList args, Cardinal num_args)
parent parent of the extended list widget to be
created
name name of the extended list widget to be
created
args arguments to pass to XtCreateWidget for the
extended list
num_args number of arguments passed
This convenience routine simply takes the passed parameters and calls
XtCreateWidget, returning the widget created.
XmExt18ListUnselectAllItems
void XmExt18ListUnselectAllItems( Widget w )
w the extended list widget to be modified
Unselects all rows of the passed extended list widget and returns noth‐
ing.
XmExt18ListUnselectItem
void XmExt18ListUnselectItem(Widget w, Xm18RowInfo *row_info)
w extended list widget
row_info pointer to the row which is to be unse‐
lected.
Unselects the row designated by row_info of the passed extended list
widget w
COPYRIGHT
Copyright (c) 1992 by Integrated Computer Solutions, Inc.
XxExt18LIst(3x)
