X11
The X11 package contains some units which contain the translations of the X header files.
List of units
The most basic units are:
- X basic X routines.
- xcms Some color management.
- xlib Xlib toolkit.
- xrender X Render extension.
- xresource X resource management.
- xshm X shared memory extension.
- xutil X util lib.
Newer units:
- cursorfont
- xinerama
- xrandr
- keysym
- xf86dga.pp
- xkb
- xv
- xf86vmode
- xkblib
- xvlib
- xatom
- xi
All these units link to the various X libraries. These units interface to the documented client libraries, and are thus largely immune to the X11<->Xorg changes.
Examples
A window with a message
This is a very simple application which shows a window with a written message.
program xshowwindow;
{$mode objfpc}{$H+}
uses
xlib,
x,
ctypes;
procedure ModalShowX11Window(AMsg: string);
var
d: PDisplay;
w: TWindow;
e: TXEvent;
msg: PChar;
s: cint;
begin
msg := PChar(AMsg);
{ open connection with the server }
d := XOpenDisplay(nil);
if (d = nil) then
begin
WriteLn('[ModalShowX11Window] Cannot open display');
exit;
end;
s := DefaultScreen(d);
{ create window }
w := XCreateSimpleWindow(d, RootWindow(d, s), 10, 10, 200, 200, 1,
BlackPixel(d, s), WhitePixel(d, s));
{ select kind of events we are interested in }
XSelectInput(d, w, ExposureMask or KeyPressMask);
{ map (show) the window }
XMapWindow(d, w);
{ event loop }
while (True) do
begin
XNextEvent(d, @e);
{ draw or redraw the window }
if (e._type = Expose) then
begin
XFillRectangle(d, w, DefaultGC(d, s), 20, 20, 10, 10);
XDrawString(d, w, DefaultGC(d, s), 50, 50, msg, strlen(msg));
end;
{ exit on key press }
if (e._type = KeyPress) then Break;
end;
{ close connection to server }
XCloseDisplay(d);
end;
begin
ModalShowX11Window('My message');
end.See Also
From the Free Pascal wiki, page "X11", as it stood on 2019-12-21 after a change by Trev, out of the wiki's dump of 2024-05-26. Copyright stays with the author who wrote it, according to the old wiki's Licensing page. If you have concerns about this material, message the admin.
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