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File: external-widget.info,  Node: Top,  Next: Using an External Client Widget,  Up: (dir)

   An "external client widget" is a widget that is part of another
program but functions as an Emacs frame.  This is intended to be a more
powerful replacement for standard text widgets.

* Menu:

* Using an External Client Widget::
* External Client Widget Resource Settings::
* Motif-Specific Info About the External Client Widget::


File: external-widget.info,  Node: Using an External Client Widget,  Next: External Client Widget Resource Settings,  Prev: Top,  Up: Top

Using an External Client Widget
*******************************

   There are three different implementations of the external client
widget.  One is designed for use in Motif applications and is linked
with the option `-lextcli_Xm'.  Another is designed for non-Motif
applications that still use the X toolkit; it is linked with the option
`-lextcli_Xt'.  The third is designed for applications that do not use
the X toolkit; it is linked with the option `-lextcli_Xlib'.  In order
to use an external client widget in a client program that uses the X
toolkit (i.e. either of the first two options described above), simply
create an instance of widget type ExternalClient and link your program
with the appropriate library.  The corresponding header file is called
`ExternalClient.h'.

   Documentation still needs to be provided for using the raw Xlib
version of the external client widget.

   The external client widget will not do anything until an instance of
Emacs is told about this particular widget.  To do that, call the
function `make-frame', specifying a value for the frame parameter
`window-id'.  This value should be a string containing the decimal
representation of the widget's X window ID number (this can be obtained
by the Xt function `XtWindow()').  In order for the client program to
communicate this information to Emacs, a method such as sending a
ToolTalk message needs to be used.

   Once `make-frame' has been called, Emacs will create a frame that
occupies the client widget's window.  This frame can be used just like
any other frame in Emacs.


File: external-widget.info,  Node: External Client Widget Resource Settings,  Next: Motif-Specific Info About the External Client Widget,  Prev: Using an External Client Widget,  Up: Top

External Client Widget Resource Settings
****************************************

   The external client widget is a subclass of the Motif widget
XmPrimitive and thus inherits all its resources.  In addition, the
following new resources are defined:

`deadShell (class DeadShell)'
     A boolean resource indicating whether the last request to the
     ExternalShell widget that contains the frame corresponding to this
     widget timed out.  If true, no further requests will be made (all
     requests will automatically fail) until a response to the last
     request is received.  This resource should normally not be set by
     the user.

`shellTimeout (class ShellTimeout)'
     A value specifying how long (in milliseconds) the client should
     wait for a response when making a request to the corresponding
     ExternalShell widget.  If this timeout is exceeded, the client
     will assume that the shell is dead and will fail the request and
     all subsequent requests until a response to the request is
     received.  Default value is 5000, or 5 seconds.

   The shell that contains the frame corresponding to an external client
widget is of type ExternalShell, as opposed to standard frames, whose
shell is of type TopLevelShell.  The ExternalShell widget is a direct
subclass of Shell and thus inherits its resources.  In addition, the
following new resources are defined:

`window (class Window)'
     The X window ID of the widget to use for this Emacs frame.  This is
     normally set by the call to `x-create-frame' and should not be
     modified by the user.

`deadClient (class DeadClient)'
     A boolean resource indicating whether the last request to the
     corresponding ExternalClient widget timed out.  If true, no further
     requests will be made (all requests will automatically fail) until
     a response to the last request is received.  This resource should
     normally not be set by the user.

`ClientTimeout (class ClientTimeout)'
     A value specifying how long (in milliseconds) the shell should wait
     for a response when making a request to the corresponding
     ExternalClient widget.  If this timeout is exceeded, the shell
     will assume that the client is dead and will fail the request and
     all subsequent requests until a response to the request is
     received.  Default value is 5000, or 5 seconds.

   Note that the requests that are made between the client and the shell
are primarily for handling query-geometry and geometry-manager requests
made by parent or child widgets.


File: external-widget.info,  Node: Motif-Specific Info About the External Client Widget,  Prev: External Client Widget Resource Settings,  Up: Top

Motif-Specific Info About the External Client Widget
****************************************************

   By default, the external client widget has navigation type
`XmTAB_GROUP'.

   The widget traversal keystrokes are modified slightly from the
standard XmPrimitive keystrokes.  In particular, `<TAB>' alone does not
traverse to the next widget (`Ctrl-<TAB>' must be used instead), but
functions like a normal <TAB> in Emacs.  This follows the semantics of
the Motif text widget.  The traversal keystrokes `Ctrl-<TAB>' and
`Shift-<TAB>' are silently filtered by the external client widget and
are not seen by Emacs.



Tag Table:
Node: Top99
Node: Using an External Client Widget529
Node: External Client Widget Resource Settings2244
Node: Motif-Specific Info About the External Client Widget4987

End Tag Table
