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NAME

       XmTextField — The TextField class

SYNOPSIS

       #include <Xm/Xm.h>

DESCRIPTION

       The  TextField  widget  provides  a  single line text editor for customizing both user and
       programmatic interfaces. It is used for single-line string entry,  and  forms  entry  with
       verification  procedures.  It provides an application with a consistent editing system for
       textual data.

       TextField provides separate callback lists  to  verify  movement  of  the  insert  cursor,
       modification of the text, and changes in input focus. Each of these callbacks provides the
       verification function with the widget instance, the event that caused the callback, and  a
       data  structure specific to the verification type. From this information, the function can
       verify if the application considers this to be a legitimate state change  and  can  signal
       the widget whether to continue with the action.

       The  user  interface  tailors  a new set of actions.  The key bindings have been added for
       insert cursor movement, deletion, insertion, and selection of text.

       TextField allows the user to select regions of text.  Selection  is  based  on  the  model
       specified  in  the  Inter-Client  Communication  Conventions  Manual  (ICCCM).   TextField
       supports primary and secondary selection.

       TextField uses the XmQTnavigator, XmQTspecifyRenderTable, and XmQTscrollFrame traits,  and
       holds the XmQTaccessTextual XmQTtransfer traits.

       If  an  application  or  widget calls the setValue trait method of XmQTaccessTextual, then
       XmTextField will call XmTextFieldSetString to set the string value.

   Data Transfer Behavior
       TextField supports transfer of  the  primary,  secondary,  and  clipboard  selections  and
       dragging  of selected text from the widget.  TextField can also be the destination for the
       primary, secondary, and clipboard selections, and  it  supports  dropping  of  data  being
       dragged onto the widget.

       When  the  XmNconvertCallback  procedures  are  called,  the  location_data  member of the
       XmConvertCallbackStruct member is NULL if the selected text is being transferred.  If  the
       entire  text, not the selected text, is being transferred, the value of this member is the
       widget ID of the TextField widget.

       As a source of data, TextField supports the following targets and  associated  conversions
       of data to these targets:

       UTF8_STRING
                 The widget transfers the selected text as type UTF8_STRING.

       locale    If  the  locale  target  matches  the  widget's locale, the widget transfers the
                 selected text in the encoding of the locale.

       COMPOUND_TEXT
                 The widget transfers the selected text as type COMPOUND_TEXT.

       STRING    The widget transfers the selected text as type STRING.

       TEXT      If the selected text is fully convertible to the encoding  of  the  locale,  the
                 widget  transfers  the  selected text in the encoding of the locale.  Otherwise,
                 the widget transfers the selected text as type COMPOUND_TEXT.

       DELETE    The widget deletes the selected text.

       _MOTIF_CLIPBOARD_TARGETS
                 The widget transfers, as type ATOM, a list of the targets to  which  the  widget
                 can  convert  data to be placed on the clipboard immediately.  These include the
                 following targets:

                    ·  UTF8_STRING

                    ·  COMPOUND_TEXT

                    ·  The encoding of the locale, if the selected text is fully  convertible  to
                       the encoding of the locale

                    ·  STRING, if the selected text is fully convertible to STRING

       _MOTIF_EXPORT_TARGETS
                 The  widget  transfers,  as  type  ATOM, a list of the targets to be used as the
                 value of the DragContext's XmNexportTargets in a drag-and-drop transfer.   These
                 include  COMPOUND_TEXT,  the  encoding of the locale, STRING, TEXT, UTF8_STRING,
                 BACKGROUND, and FOREGROUND.

       _MOTIF_LOSE_SELECTION
                 The widget takes the following actions:

                    ·  When losing the PRIMARY selection, it unhighlights the selected  text  and
                       calls the XmNlosePrimaryCallback procedures.

                    ·  When  losing  the  SECONDARY selection, it removes the secondary selection
                       highlight.

                    ·  When losing the _MOTIF_DESTINATION selection, if the widget does not  have
                       focus  it  changes the cursor to indicate that the widget is no longer the
                       destination.

       As a source of data, TextField also supports the following standard Motif targets:

       BACKGROUND
                 The widget transfers XmNbackground as type PIXEL.

       CLASS     The widget finds the first shell in the widget hierarchy  that  has  a  WM_CLASS
                 property and transfers the contents as text in the current locale.

       CLIENT_WINDOW
                 The  widget  finds  the  first  shell  in the widget hierarchy and transfers its
                 window as type WINDOW.

       COLORMAP  The widget transfers XmNcolormap as type COLORMAP.

       FOREGROUND
                 The widget transfers XmNforeground as type PIXEL.

       NAME      The widget finds the first shell in the widget  hierarchy  that  has  a  WM_NAME
                 property and transfers the contents as text in the current locale.

       TARGETS   The  widget  transfers,  as type ATOM, a list of the targets it supports.  These
                 include the standard targets in this list.  These  also  include  COMPOUND_TEXT,
                 the encoding of the locale, STRING, TEXT and UTF8_STRING.

       TIMESTAMP The  widget  transfers  the  timestamp  used  to  acquire  the selection as type
                 INTEGER.

       _MOTIF_RENDER_TABLE
                 The widget transfers XmNrenderTable if it  exists,  or  else  the  default  text
                 render table, as type STRING.

       _MOTIF_ENCODING_REGISTRY
                 The  widget transfers its encoding registry as type STRING.  The value is a list
                 of NULL separated items  in  the  form  of  tag  encoding  pairs.   This  target
                 symbolizes the transfer target for the Motif Segment Encoding Registry.  Widgets
                 and applications can use this Registry to register  text  encoding  formats  for
                 specified  render  table  tags.   Applications  access  this Registry by calling
                 XmRegisterSegmentEncoding and XmMapSegmentEncoding.

       As a destination for data, TextField chooses a  target  and  requests  conversion  of  the
       selection  to  that  target.   If  the  encoding  of  the locale is present in the list of
       available targets, TextField chooses a requested target from the available targets in  the
       following order of preference:

          1. TEXT

          1. UTF8_STRING

          2. COMPOUND_TEXT

          3. The encoding of the locale

          4. STRING

       If  the  encoding of the locale is not present in the list of available targets, TextField
       chooses a  requested  target  from  the  available  targets  in  the  following  order  of
       preference:

          1. UTF8_STRING

          1. COMPOUND_TEXT

          2. STRING

   Classes
       TextField widget inherits behavior, resources, and traits from Core and Primitive.

       The class pointer is xmTextFieldWidgetClass.

       The class name is XmTextField.

   New Resources
       The  following  table  defines a set of widget resources used by the programmer to specify
       data. The programmer can also set the resource values for the  inherited  classes  to  set
       attributes  for  this  widget. To reference a resource by name or by class in a .Xdefaults
       file, remove the XmN or XmC prefix and use the remaining letters. To specify  one  of  the
       defined  values  for  a  resource  in  a .Xdefaults file, remove the Xm prefix and use the
       remaining letters (in either lower case or upper case, but include any underscores between
       words).   The  codes  in  the  access  column indicate if the given resource can be set at
       creation time (C), set by using XtSetValues (S), retrieved by using XtGetValues (G), or is
       not applicable (N/A).

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