diff options
| -rw-r--r-- | Hermes/Hermes_Gui1.3.rkt | 99 | ||||
| -rw-r--r-- | Hermes/client.rkt | 3 |
2 files changed, 67 insertions, 35 deletions
diff --git a/Hermes/Hermes_Gui1.3.rkt b/Hermes/Hermes_Gui1.3.rkt index ba239c3..67597e4 100644 --- a/Hermes/Hermes_Gui1.3.rkt +++ b/Hermes/Hermes_Gui1.3.rkt @@ -12,8 +12,7 @@ (provide make-gui) (define (make-gui) - (begin - ;;Create the frame + ;;Create the frame/window with title "Example5", width 500 and height 700 (define main-frame (new frame% [label "Example5"] [width 500] @@ -33,84 +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! height 0) - (update-helper given-list))) + (set! listy '()) + (set! height 0) + (update-helper given-list)) (define (update-helper given-list) (if (null? given-list) @@ -127,9 +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)) @@ -144,7 +170,7 @@ (else (error "Invalid Request" command)) )) ;;dispatch goes below that - dispatch)) + dispatch) ;This one displays information @@ -161,7 +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 '()) @@ -181,7 +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") @@ -189,6 +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)) diff --git a/Hermes/client.rkt b/Hermes/client.rkt index 9b4e658..91c22de 100644 --- a/Hermes/client.rkt +++ b/Hermes/client.rkt @@ -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)) |