Ubuntu Manpage: XmTextField — The TextField class

Provided by: libmotif-dev_2.3.4-10_amd64

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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