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Introduction
------------

PDCurses for X11 uses the System V IPC shared memory facility, along 
with sockets, to share data between the curses program and the child 
process created to manage the X stuff.

When compiling your application, you need to include the <curses.h> or 
<xcurses.h> that comes with PDCurses. You also need to link your code 
with libXCurses. You may need to link with the following libraries under 
X11R5:
    Xaw Xmu Xt X11

or, under X11R6:
    Xaw Xmu Xt X11 SM ICE Xext

You can run "xcurses-config --libs" to show the link parameters for your 
system. If using dynamic linking, on some systems, "-lXCurses" suffices.

By calling Xinitscr() rather than initscr(), you can pass your program 
name and resource overrides to PDCurses. The program name is used as the 
title of the X window, and for defining X resources specific to your 
program.


Here be Dragons!
----------------

Be aware that curses programs that expect to have a normal tty 
underneath them will be very disappointed! Output directed to stdout 
after a call to system() (maybe even exec()) will go to the xterm that 
invoked the PDCurses application, or to the console if not invoked 
directly from an xterm. Similarly, stdin will expect its input from the 
same place as stdout.

This situation is not desirable, but I know of no simple way to get 
around this.


X Resources
-----------

PDCurses for X11 recognises the following resources:

    lines
    cols
    normalFont
    italicFont
    pointer
    pointerForeColor
    pointerBackColor
    cursorColor
    textCursor
    colorBlack
    colorRed
    colorGreen
    colorYellow
    colorBlue
    colorMagenta
    colorCyan
    colorWhite
    colorBoldBlack
    colorBoldRed
    colorBoldGreen
    colorBoldYellow
    colorBoldBlue
    colorBoldMagenta
    colorBoldCyan
    colorBoldWhite
    bitmap
    pixmap
    translations
    shmmin
    borderWidth
    borderColor
    clickPeriod
    doubleClickPeriod
    composeKey

lines:		   Specifies the number of lines the "screen" will have.
		   Directly equates to LINES.
		   There is no theoretical maximum.
		   The minimum value must be 2.
		   Default:	   24

cols:		   Specifies the number of columns the "screen" will have.
                   Directly equates to COLS.
                   There is no theoretical maximum.
                   The minimum value must be 2.
                   Default:	   80

normalFont:	   The name of a fixed width font.
		   Default:	   7x13

italicFont:	   The name of a fixed width font to be used for
		   characters with A_ITALIC attributes. Must have the 
		   same cell size as normalFont.
		   Default:	   7x13 (obviously not an italic font)

pointer:	   The name of a valid pointer cursor.
		   Default:	   xterm

pointerForeColor:  The foreground color of the pointer.
		   Default:	   black

pointerBackColor:  The background color of the pointer.
		   Default:	   white

textCursor:	   The alignment of the text cursor; horizontal or vertical.
		   Default:	   horizontal

colorBlack:	   The color of the COLOR_BLACK attribute.
		   Default:	   Black

colorRed:	   The color of the COLOR_RED attribute.
		   Default:	   red3

colorGreen:	   The color of the COLOR_GREEN attribute.
		   Default:	   green3

colorYellow:	   The color of the COLOR_YELLOW attribute.
		   Default:	   yellow3

colorBlue:	   The color of the COLOR_BLUE attribute.
		   Default:	   blue3

colorMagenta:	   The color of the COLOR_MAGENTA attribute.
		   Default:	   magenta3

colorCyan:	   The color of the COLOR_CYAN attribute.
		   Default:	   cyan3

colorWhite:	   The color of the COLOR_WHITE attribute.
		   Default:	   Grey

colorBoldBlack:    COLOR_BLACK combined with A_BOLD.
		   Default:	   grey40

colorBoldRed:	   COLOR_RED combined with A_BOLD.
		   Default:	   red1

colorBoldGreen:    COLOR_GREEN combined with A_BOLD.
		   Default:	   green1

colorBoldYellow:   COLOR_YELLOW combined with A_BOLD.
		   Default:	   yellow1

colorBoldBlue:	   COLOR_BLUE combined with A_BOLD.
		   Default:	   blue1

colorBoldMagenta:  COLOR_MAGENTA combined with A_BOLD.
		   Default:	   magenta1

colorBoldCyan:	   COLOR_CYAN combined with A_BOLD.
		   Default:	   cyan1

colorBoldWhite:    COLOR_WHITE combined with A_BOLD.
		   Default:	   White

bitmap:		   The name of a valid bitmap file of depth 1 (black and white)
		   used for the application's icon. The file is an X bitmap.
		   Default:        a 32x32 or 64x64 pixmap depending on the 
				   window manager

pixmap:		   The name of a valid pixmap file of any depth 
		   supported by the window manager (color) for the 
		   application's icon, The file is an X11 pixmap. This 
		   resource is only available if the libXpm package has 
		   been installed (most systems have this by default). 
		   This resource overrides the "bitmap" resource.
                   Default:        none, uses default bitmap above

translations:      Translations enable the user to customise the action
		   that occurs when a key, combination of keys, or a
		   button is pressed.  The translations are similar to
		   those used by xterm.
		   Defaults:
			<Key>:		XCursesKeyPress()
			<KeyUp>:	XCursesKeyPress()
			<BtnDown>:	XCursesButton()
			<BtnUp>:	XCursesButton()
			<BtnMotion>:	XCursesButton()

		   The most useful action for KeyPress translations is 
		   string(). The argument to the string() action can be 
		   either a string or a hex representation of a 
		   character; e.g., string(0x1b) will send the ASCII
		   escape character to the application; string("[11~") 
		   will send [ 1 1 ~ , as separate keystokes.

shmmin:		   On most systems, there are two Unix kernel parameters
		   that determine the allowable size of a shared memory
		   segment. These parameters are usually something like 
		   SHMMIN and SHMMAX. To use shared memory, a program
		   must allocate a segment of shared memory that is
		   between these two values.  Usually these values are
		   like 1 for SHMMIN and some large number for SHMMAX. 
		   Sometimes the Unix kernel is configured to have a
		   value of SHMMIN that is bigger than the size of one
		   of the shared memory segments that libXCurses uses. 
		   On these systems an error message like:

		     Cannot allocate shared memory for SCREEN: Invalid argument

		   will result. To overcome this problem, this resource 
		   should be set to the kernel value for SHMMIN. This
		   ensures that a shared memory segment will always be
		   bigger than the kernel value for SHMMIN (and
		   hopefully less than SHMMAX!)

		   Default:	   0

borderColor:	   The color of the border around the screen.
		   Default:	   black

borderWidth:	   The width in pixels of the border around the screen.
		   Default:	   0

clickPeriod:	   The period (in milliseconds) between a button 
		   press and a button release that determines if a click
		   of a button has occurred.
		   Default:	   100

doubleClickPeriod: The period (in milliseconds) between two button
		   press events that determines if a double click
		   of a button has occurred.
		   Default:	   200

composeKey:	   The name of the X key that defines the "compose key"
		   which is used to enter characters in the Latin-1 
		   character set above 0xA0. Generally this key will be 
		   one of the X "modifier" keys, like Alt_L, Meta_R etc. 
		   but can be a "normal" key like F1.  While in 
		   "compose key" mode, the text cursor will appear as a 
		   hollow rectangle. See the file latin-1.man for 
		   details on compose key usage.
		   Default:	   Multi_key


Using Resources
---------------

All applications have a top-level class name of "XCurses". If Xinitscr() 
is used, it sets an application's top-level widget name. (Otherwise the 
name defaults to "PDCurses".)

Examples for app-defaults or .Xdefaults:

!
! resources for XCurses class of programs
!
XCurses*lines:  30
XCurses*cols:   80
XCurses*normalFont:     9x13
XCurses*bitmap: /tmp/xcurses.xbm
XCurses*pointer: top_left_arrow
!
! resources for testcurs - XCurses
!
testcurs.colorRed:      orange
testcurs.colorBlack:    midnightblue
testcurs.lines: 25
*testcurs.Translations: #override \n \
  <Key>F12:  string(0x1b) string("[11~") \n
!
! resources for THE - XCurses
!
! resources with the * wildcard can be overridden by a parameter passed
! to initscr()
!
the*normalFont: 9x15
the*lines:      40
the*cols:       86
the*pointer:    xterm
the*pointerForeColor: white
the*pointerBackColor: black
!
! resources with the . format can not be overridden by a parameter passed
! to Xinitscr()
!
the.bitmap:     /home/mark/the/the64.xbm
the.pixmap:     /home/mark/the/the64.xpm

Resources may also be passed as parameters to the Xinitscr() function. 
Parameters are strings in the form of switches; e.g., to set the color 
"red" to "indianred", and the number of lines to 30, the string passed 
to Xinitscr would be: "-colorRed indianred -lines 30"


Deprecated
----------

XCursesProgramName is no longer used. To set the program name, you must 
use Xinitscr(), or PDC_set_title() to set just the window title.

The XCursesExit() function is now called automatically via atexit(). 
(Multiple calls to it are OK, so you don't need to remove it if you've 
already added it for previous versions of PDCurses.)

It is no longer necessary to explicitly define XCURSES, except if 
building under Cygwin. (It's defined automatically.)

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