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;;; -*- Mode:Lisp; Syntax: Common-lisp; Package:XLIB; Base:10; Lowercase: Yes -*-
(in-package :xlib)
(defun hello-world (host &rest args &key (string "Hello World") (font "fixed"))
;; CLX demo, says STRING using FONT in its own window on HOST
(let ((display nil)
(abort t))
(unwind-protect
(progn
(setq display (open-display host))
(multiple-value-prog1
(let* ((screen (display-default-screen display))
(black (screen-black-pixel screen))
(white (screen-white-pixel screen))
(font (open-font display font))
(border 1) ; Minimum margin around the text
(width (+ (text-width font string) (* 2 border)))
(height (+ (max-char-ascent font) (max-char-descent font) (* 2 border)))
(x (truncate (- (screen-width screen) width) 2))
(y (truncate (- (screen-height screen) height) 2))
(window (create-window :parent (screen-root screen)
:x x :y y :width width :height height
:background black
:border white
:border-width 1
:colormap (screen-default-colormap screen)
:bit-gravity :center
:event-mask '(:exposure :button-press)))
(gcontext (create-gcontext :drawable window
:background black
:foreground white
:font font)))
;; Set window manager hints
(set-wm-properties window
:name 'hello-world
:icon-name string
:resource-name string
:resource-class 'hello-world
:command (list* 'hello-world host args)
:x x :y y :width width :height height
:min-width width :min-height height
:input :off :initial-state :normal)
(map-window window) ; Map the window
;; Handle events
(event-case (display :discard-p t :force-output-p t)
(exposure ;; Come here on exposure events
(window count)
(when (zerop count) ;; Ignore all but the last exposure event
(with-state (window)
(let ((x (truncate (- (drawable-width window) width) 2))
(y (truncate (- (+ (drawable-height window)
(max-char-ascent font))
(max-char-descent font))
2)))
;; Draw text centered in widnow
(clear-area window)
(draw-glyphs window gcontext x y string)))
;; Returning non-nil causes event-case to exit
nil))
(button-press () t))) ;; Pressing any mouse-button exits
(setq abort nil)))
;; Ensure display is closed when done
(when display
(close-display display :abort abort)))))
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