removed unnecessary begin statements. Added more documentation to gui code.

This commit is contained in:
Ibrahim Mkusa 2017-04-23 00:51:25 -04:00
parent ce93a60d0e
commit a9f7121695
2 changed files with 65 additions and 32 deletions

View File

@ -32,84 +32,108 @@
(get-height-from-list (car paint-listy)))
(do-more-stuff-paint (cdr paint-listy) paint-canvas paint-dc))))
; canvas for displaying messages with horizontal and vertical scrollbar.
; on an event it calls do-stuff-paint to redraw things on the screen
; properly
(define read-canvas (new canvas%
[parent main-frame]
[paint-callback do-stuff-paint]
[style '(hscroll vscroll)]
))
; "send" is rackets way of doing object-oriented programming. It calls an
; objects functions in this case "read-canvas" object's init-auto-scrollbars
(send read-canvas init-auto-scrollbars #f #f 0 0);Start with no scrollbars
;;text-field stuff
(define (text-feild-callback callback-type other-thing)
; editing area callback. Gets called when enter is pressed.
(define (text-field-callback callback-type other-thing)
(if (equal? 'text-field-enter (send other-thing get-event-type))
(button-do-stuff 'irrelevant 'not-used)
'()))
; creates the editing area as part of the parent "main-frame" define above.
; initially labelled "Username:"
; TODO make label setable
(define input (new text-field%
[parent main-frame]
[label "Username:"]
[callback text-feild-callback]
[callback text-field-callback]
))
;;button stuff
; It's a callback function activated when the send button is pressed in the
; GUI. It is also called manually when textfield receives an enter key
(define (button-do-stuff b e);b and e do nothing :/
(begin
(if (color-change-request? (send input get-value))
(set! my-color (get-color-from-input (send input get-value)))
(if (< 0 (string-length (send input get-value)))
(send-message (send input get-value) my-color);;
'()))
(send input set-value "")
))
)
; creates the send button
(define send-button (new button%
[parent main-frame]
[label "Send"]
[callback button-do-stuff]))
;;I forget what these do but don't move them
; get-dc retrieves the canvas' device context. From racket docs. A dc object
; is a drawing context for drawing graphics and text. It represents output
; devices in a generic way.
; Specifically the line below retrieves our canvas device context object.
(define dc (send read-canvas get-dc))
(send dc set-scale 1 1)
(send dc set-text-foreground "black")
(send dc set-scale 1 1) ; set scaling config of output display to 1 to 1
; no scalling
(send dc set-text-foreground "black") ; color of text that gets drawn on the
; canvas with "draw-text"
; (send dc set-smoothing 'aligned)
;;messaging stuff
(define (user-message-parse string start)
(begin
; could convert below to regexes
(define (user-message-parse string-i start)
(define (helper str index)
(if (eq? (string-ref str (+ start index)) #\~)
(if (eq? (string-ref str (+ start index)) #\~) ; regexes would allow us
; to avoid this #\~
(substring str start (+ start index))
(helper str (+ index 1))))
(helper string 0)))
(helper string-i 0))
(define (user-message onetrueinput)
(begin
(define username (user-message-parse onetrueinput 0))
(define input (user-message-parse onetrueinput (+ 1(string-length username))))
(define color (substring onetrueinput (+ 2 (string-length username) (string-length input))))
(send dc set-text-foreground color)
;; draws a user input to the screen
(define (user-message user-input)
(define username (user-message-parse user-input 0))
(define input (user-message-parse user-input (+ 1 (string-length username))))
(define color (substring user-input (+ 2 (string-length username) (string-length input))))
(send dc set-text-foreground color) ; set dc's text color to user
; provided
(send dc draw-text (string-append username ":" input) 0 height)
(set! listy (appendlist listy (list username input color height)))
(set! height (+ height 15))
; redraw overly long text on gui
(set! min-v-size (+ min-v-size 15))
(if (> (* 20 (string-length input)) min-h-size)
(set! min-h-size (* 20 (string-length input)))
'())
(send read-canvas init-auto-scrollbars min-h-size min-v-size 0 1)
))
;;Add a function that parces input from a string and extracts elements
)
;;Add a function that parces input from a string-i and extracts elements
;;This probably won't change...
; actually gets called to send input to the screen. user-message is in effect
; its helper. It uses "~" to delimit the different components of message
(define (send-message input color)
(user-message (string-append name "~" input "~" color)))
;;Although re-draw is kind of misleading, it is just print the whole
;;list of strings to the screen
;; draws messages to the screen canvas as text
(define (re-draw-message username input color in-height)
(begin
(send dc set-text-foreground color)
(send dc draw-text (string-append username ":" input) 0 in-height)
))
; used when redrawing the screen along with its helper.
(define (update given-list)
(begin (set! listy '())
(set! listy '())
(set! height 0)
(update-helper given-list)))
(update-helper given-list))
(define (update-helper given-list)
(if (null? given-list)
@ -126,9 +150,12 @@
(define name "Me")
(define min-h-size 80)
(define min-v-size 30)
(define listy (list (list "Server" "Connected" "Red" 0)))
(define my-color "black")
(define height 15)
(define listy (list (list "Server" "Connected" "Red" 0))) ; initializes
; listy with first message to be drawn on screen
(define my-color "black") ; default color of the text messages if none
; specified
(define height 15) ; height between messages drawn on the screen
;;dispatch goes below that
(define (dispatch command)
(cond ((eq? command 'show) (send main-frame show #t))
@ -160,7 +187,9 @@
;the username the message they said and the color they used
;The the height the message should display at
; listoflist is listy here, and add-to-end is what gets appended to the end
; really expensive operation but its important for Doug to showcase some opl
; concepts
(define (appendlist listoflist add-to-end)
(if (null? listoflist)
(cons add-to-end '())
@ -180,7 +209,7 @@
;this one is a crap version of justpressing the enter key
; did user request for color change /
(define (color-change-request? given-string)
(if (> (string-length given-string) 7)
(if (equal? (substring given-string 0 6) "/color")
@ -188,6 +217,7 @@
#f)
#f))
; we should use regexes for this.
(define (get-color-from-input given-string)
(substring given-string 7))
;(define thing1 (make-gui))

View File

@ -37,6 +37,9 @@
; store username to a file for later retrieval along with relevent
; info used for authentication with server
; TODO
; semaphore for gui object
; could display a bubble and prompt for username in GUI object
(displayln "What's your name?")
(define username (read-line))