Volume 6A: Motif Programming Manual

The output of the program is shown in the figure.

Output of file_browser.c

We use the convenience routine XmCreateScrolledText() to create a ScrolledText area. We specify that the

Text widget displays 12 lines by 70 columns of text by setting the XmNrows and XmNcolumns resources. These

settings are used only at initialization. Once the application is up and running, the user can resize the window and

effectively change those dimensions.

The XmNeditable resource is set to False to prevent the user from editing the contents of the Text widget. Since

we do not provide a way to write changes back to the file, we don't want to mislead the user into thinking that the file

is editable. Since a noneditable Text widget should not display an insertion cursor, we remove it by setting

XmNcursorPositionVisible to False.

The FileSelectionDialog is created and managed when the user selects the Open button from the File menu. The user

can exit the program by selecting the Exit button from this menu. The read_file() routine is activated when the

user presses the OK button in the FileSelectionDialog or enters RETURN in the TextField widget. This function gets

the specified file and checks its type. If the file chosen is not a regular file (e.g., if it is a directory, device, tty, etc.) or

if it cannot be opened, an error is reported and the function simply returns. If you are unfamiliar with the use of the