< Previous PageNext Page >

Xdialog Sample Application

Overview

Xdialog is a general utility placed on the BlackDog device that provides an X user interface (X11 dialog window) for interacting with a user. An Xdialog application displays dialog boxes from shell scripts to:

• Present information and messages in a text box or window.
• Ask questions and solicit information through UI elements (such as text fields or checkboxes) in a dialog box. Xdialog can then pass user-supplied information to another application or client.

Xdialog Sample Applications

Two Xdialog sample applications are provided:

• Information window application, which launches an Xdialog box that displays a text file in a text box.
• Remote desktop application, which launches an Xdialog box that solicits user information, which is then passed to a remote desktop client. The sample Xdialog box contains a field for entry of an IP address (or a fully qualified URL), with Submit and Cancel command buttons.

Running Xdialog Sample Applications

To run the Information Xdialog sample application, execute usr/bin/Xdialog.

To run the Remote Desktop Xdialog sample application, execute the shell script at usr/bin/rdesk.sh.

Xdialog Command Syntax

Synopsis
Xdialog --clear
Xdialog --create-rc file
Xdialog [ --title title ] [ --clear ] [ --hline line ] [ --hfile file ]
box-options

Options
--clear The screen will be cleared to the screen attribute on exit.
--create-rc file Since Xdialog supports run-time configuration, this can be used to dump a sample configuration file to the file specified by file.
--title title Specifies a title string to be displayed at the top of the dialog box.
--hline line Specifies a line string to be displayed at the bottom of the dialog box.
--hfile file Specifies a file to be displayed by pressing ? or F1.

Box Options

--yesno text height width

A yes/no dialog box of size height rows by width columns will be displayed. The string specified by text is displayed inside the dialog box. If this string is too long to fit in one line, it will be automatically divided into multiple lines at the appropriate points. The text string may also contain the sub-string "\n" or newline characters `\n´ to control line breaking explicitly. This dialog box is useful for asking questions that require the user to answer either yes or no. The dialog box has a Yes button and a No button, in which the user can switch between by pressing the TAB key.

--msgbox text height width

A message box is very similar to a yes/no box. The only difference between a message box and a yes/no box is that a message box has only a single OK button. You can use this dialog box to display any message you like. After reading the message, the user can click OK or press the ENTER key so that Xdialog will exit and the calling shell script can continue its operation.

--infobox text height width

An info box is basically a message box. However, in this case, Xdialog will exit immediately after displaying the message to the user. The screen is not cleared when Xdialog exits, so that the message will remain on the screen until the calling shell script clears it. This is useful when you want to inform the user that some operations are carrying on that may require some time to finish.

--inputbox text height width

An input box is useful when you want to ask questions that require the user to input a string as the answer. When inputting the string, the BACKSPACE key can be used to correct typing errors. If the input string is longer than can be contained in the dialog box, the input field will be scrolled. On exit, the input string will be printed on stderr.

--textbox file height width

A text box lets you display the contents of a text file in a dialog box. It is like a simple text file viewer. The user can move through the file by using the UP/DOWN, PGUP/PGDN and HOME/END keys available on most keyboards. If the lines are too long to be displayed in the box, the LEFT/RIGHT keys can be used to scroll the text region horizontally. For more convenience, forward and backward searching functions are also provided.

--menu text height width menu-height [ tag item ] ...

As its name suggests, a menu box is a dialog box that can be used to present a list of choices in the form of a menu for the user to choose. Each menu entry consists of a tag string and an item string.

• The tag gives the entry a name to distinguish it from the other entries in the menu.
• The item is a short description of the option that the entry represents.

The user can move between the menu entries by pressing the UP/DOWN keys, the first letter of the tag as a hot-key, or the number keys 1-9. There are menu-height entries displayed in the menu at one time, but the menu will be scrolled if there are more entries than that. When Xdialog exits, the tag of the chosen menu entry will be printed on stderr.

--prgbox command height width

A program box lets you display output of command in dialog box.

--checklist text height width list-height [ tag item status ] ...

A checklist box is similar to a menu box in that there are multiple entries presented in the form of a menu. Instead of choosing one entry among the entries, each entry can be turned on or off by the user. The initial on/off state of each entry is specified by status. On exit, a list of the tag strings of those entries that are turned on will be printed on stderr.

--ftree file FS text height width menu-height

ftree box is a dialog box showing the tree described by the data from the file file. The data in the file should look like find(1) output. For the find output, the field separator FS will be ´/´. If height and width are positive numbers, they set the absolute size of the whole ftree box. If height and width are negative numbers, the size of the ftree box will be selected automatically. menu-height sets the height of the tree subwindow inside the ftree box and must be set. text is shown inside the ftree box above the tree subwindow and can contain newline characters '\n´ to split lines. You can navigate in the tree by pressing UP/DOWN or ´+´/´-´, PG_UP/PG_DOWN or ´b´/SPACE and HOME/END or ´g´/´G´. A leaf of the tree is selected by pressing TAB or LEFT/RIGHT the OK button and pressing ENTER. The selected leaf (to be more exact, the full path to it from the root of the tree) is printed to stderr. If Cancel and then ENTER is pressed, nothing is printed to stderr. file may contain data like find(1) output, as well as like the output of find(1) with -d option. Some of the transient paths to the leaves of the tree may be absent. Such data is corrected when fed from file.

--tree FS text height width menu-height [ item ] ...

tree box is like ftree box with some exceptions. First, the data is not entered from a file, but from the command line as item item ... Second, the data thus entered is not corrected in any way. Therefore, the data like the output of find(1) with -d option will not be correctly formatted.

For additional information on the Xdialog command, please refer to the FreeBSD Hypertext Man page for Dialog.

For information on how to launch an Xdialog application from the Launcher menu, refer to the Launcher Sample Application.

Deploying an Updated Xdialog Application

After you make configuration changes to a Xdialog sample application (customized for your site), you need to deploy the updated Xdialog application to BlackDog devices. You must update the Xdialog file in the Xdialog Sample application debian package source tree, build a new package, and deploy directly to the BlackDog device.

	< Previous PageNext Page >

		Copyright © Realm Systems, Inc. 2003-2005. All rights reserved.