Monday, 21 October 2013

Simple tooltip style

The helpful tooltip bubble is very useful to give user hints about button, or other GUI elements, function. Mr. Marco Anotiazzi wrote this style very easy to use: just use the help word in a style, followed by thetooltip string.
Here is an example:

win: layout [
area "another face" help "an area"
panel [across
button "test" help "the first button"
button "test2" help "the second button"
btn "test3" help "the third button" [probe face/feel]
button 120 "test4 without help"
]
]

view center-face win




Here is the source code:

REBOL [
    title: "Tooltip style example"
    file: %simple-tooltip-style.r
    author: "Marco Antoniazzi"
    email: [luce80 AT libero DOT it]
    date: 30-04-2011
    version: 0.9.3
    Purpose: {A quick way to add a simple tooltip to VID GUIs}
    comment: {You are strongly encouraged to post an enhanced version of this script}
    History: [
        0.0.1 [03-12-2010 "First version"]
        0.8.0 [08-01-2011 "Enhanced"]
        0.9.0 [16-01-2011 "Enhanced with function by Shadwolf, Boss, DideC, Volker and the tipped flag"]
        0.9.1 [08-02-2011 "Minor bug fixes and source retouches"]
        0.9.2 [19-02-2011 "Minor bug fix of offset/x"]
        0.9.3 [30-04-2011 "Minor source retouches"]
    ]
    Category: [util vid view]  
    license: 'BSD
]
tip: make face [
    color: yello + 30
    font: make font [size: 11]
    para: make para [wrap?: false]
    edge: make edge [size: 1x1 color: gray]
    ticks: 0
    start_tip: func [face] [
        if ticks <> 0 [exit]
        if not text: face/help [exit]
        size: 4x6 + size-text self
        rate: 0:0:0.500
        offset: - size ; hide it
        remove find get in find-window face 'pane self
        append get in find-window face 'pane self
        show find-window face
    ]
    open_tip: func [woffset /local wsize] [
        offset: woffset + 0x15
        wsize: get in find-window self 'size
        ; keep inside window
        if offset/y > (wsize/y - size/y) [offset/y: offset/y - size/y - 16]
        offset/x: max min wsize/x - size/x offset/x 0
        show self/parent-face
    ]
    close_tip: func [] [
        if size = 100x100 [exit] ; entering here before start_tip
        rate: none
        offset: - size
        ticks: 0
        show self/parent-face
    ]
    feel: make feel [
        engage: func [face action event][
            if action = 'time [
                if ticks = 1 [open_tip event/offset]
                if ticks = 6 [close_tip]
                ticks: ticks + 1
            ]
        ]
    ]
    over: func [face over? offset] [either all [over? not flag-face? face tipped] [start_tip face] [deflag-face face tipped close_tip]]
    engage: func [face action event] [if not flag-face? face tipped [flag-face face tipped close_tip]]
]
flag-face?: func [
    "Checks a flag in a VID face."
    face [object!] 'flag
] [all [in face 'flags face/flags find face/flags flag]] ; patched

; this function is taken from %toolt4vid.r (only a little modified)
Add-tooltip-2-style: func [{ Allow to add the   tooltip support to all widgets passed in parameter}
    style-lst [block! ] "Contains the listing of Vid widgets to patch"
    style-root "Countain the path of the root-styles to patch"
][
    foreach style style-lst [
        if find style-root style [     ; Teste si le style existe pour la compatibilit√É© avec les versions ant√É©rieures de view
            style-root/:style/feel: make style-root/:style/feel [
                over*: :over
                over: func [face action offset][
                    tip/over face action offset
                    over* face action offset ; call original
                ]
                engage*: :engage
                engage: func [face action event][
                    engage* face action event
                    tip/engage face action event
                ]
            ]
        ]
    ]
]
; here is the list of widget affected by the tooltip ability (does it make sense to patch also text?)
vid-styles: [image btn backtile box sensor key base-text vtext text body txt banner vh1 vh2 vh3 vh4
            title h1 h2 h3 h4 h5 tt code button check radio check-line radio-line led
            arrow toggle rotary choice drop-down icon field info area slider scroller progress
            anim btn-enter btn-cancel btn-help logo-bar tog]
Add-tooltip-2-style vid-styles system/view/vid/vid-styles

Friday, 18 October 2013

System tray

Do you ever dreamed to put an icon of you program in the system tray? Well, today we'll discover how to do this task with few lines of Rebol code.
System tray is that small zone in the monitor area, near the clock, where there are small icons:



to put the icon just use the ToSystemTray special function. This function was created by Izkata and we'll its code at the end of this post. ToSystemTray needs a block with a string for the tip bubble description, then string and action for every line you want to show with right mouse button; the first action is the default action with left mouse button. You can add any bar you need with the keyword bar. Let's see an example:


ToSystemTray [
{I am the little help-bubble that appears while the mouse hovers over the icon}
[
{Item 1 (Also done when icon left-clicked on)} [ alert {Example} ]
bar
{Item 2 - Remove from System Tray} [RemoveSystemTray]
bar
{Quit} [quit]
]
]


Here is the result:



Here is the source code of ToSystemTray:

REBOL [
  Author: {Izkata}
  Email: Izkata@Comcast.net
  File: %simple-system-tray.r
  Date: 5-Jul-2005
  Title: {Simple System Tray}
  Purpose: {
      After learning Rebol 1.3 could place itself in the System Tray on Windows,
      and after finding Graham's example, I decided to make a slightly simpler
      version of the System Tray dialect....
      Since it's based on Graham's example, it may well be missing stuff...
      Feel free to email me anything about it, I'll likely edit and repost it!   (^.-)
  }
]
MySysTray: make object! [
  Defines: none
  Tray: none
  Parse-Systray: func [Systray][
      Defines: copy []
      Tray: compose/deep [add main [help: (first Systray) menu: []]]
      parse second Systray [
        some [
            'bar (append Tray/3/4 'bar) |
            set Str string! set Blk block! (
              append Tray/3/4 compose [(to-word rejoin [{Defines} 1 + length? Defines {:}]) (Str)]
              append Defines compose/only [(to-word join copy {Defines} 1 + length? Defines) (Blk)]
            )
        ]
      ]
      return Tray
  ]
  set 'ToSystemTray func [
      {Send REBOL to the System Tray}
      Systray [block!]
      /return {Return immediately}
  ][
      Tray: Parse-Systray Systray
      system/ports/system: open [scheme: 'system]
      append system/ports/wait-list system/ports/system
      system/ports/system/awake: func [port /local Which][
        if all [
            r: pick port 1
            r/1 = 'tray
        ][
            if r/3 = 'menu [do select Defines r/4]
            if r/3 = 'activate [do second Defines]
        ]
        return false
      ]
      set-modes system/ports/system compose/only [tray: (load mold Tray)]
      if not return [do-events]
  ]
  set 'RemoveSystemTray func [{Remove REBOL from the System Tray}][
      remove find system/ports/wait-list system/ports/system
      close system/ports/system
      system/ports/system: open [scheme: 'system]
  ]
]

Wednesday, 16 October 2013

Simple menu style

Mr. Marco Antoniazzi wrote the following script to show a way to obtain nice menu style in few lines of code:



Here is the source code:

REBOL [
    title: "Menu style example"
    file: %simple-menu-style.r
    author: "Marco Antoniazzi directly derived from Nick Antonaccio"
    email: [luce80 AT libero DOT it]
    date: 30-10-2010
    version: 0.0.1
    Purpose: {A quick way to add a simple menu to VID GUIs}
    comment: {You are strongly encouraged to post an enhanced version of this script}
    Category: [util vid view]
]
menu-Options: [
    "Open File..." [attempt [a1/text: read request-file/only show a1]]
    "Copy to Clipboard" [do-face b1 1]
    "Paste from Clipboard" [a1/text: read clipboard:// show a1]
    "______________________^/" []
    "About..." [alert "This menu is just a choice button widget :)"]
    "______________________^/" []
    "Halt" [halt]
    "Quit" [quit]
]
menu-Help: [
    "About..." [alert "This menu is just a choice button widget :)"]
]
menu-color: 235.240.245
view center-face layout [
    size 440x250
    origin 0x0   space 0x0 backdrop 253.253.253 across
    ;box menu-color 8x20
    style menu-list choice left menu-color 1x20 with [
        para: [indent: 6x0 origin: 0x0 margin: 0x0]
        font: [style: none   shadow: none   colors: [black 5.5.255]]
        colors: reduce [menu-color menu-color - 20]
        edge: none
    ] feel [
        engage: func [face action event][
            if (action = 'down) or (action = 'up) [
                choose/style/window/offset extract face/menu 2 func [face parent][
                    parent/data: find parent/texts face/text
                    do-face parent parent/text: face/text
                ] face face/parent-face (face/offset + (face/size/y * 0x1))
            ]
        ]
    ][do select face/menu value   face/text: face/texts/1   show face]
    m1: menu-list "Options" 170 with [menu: menu-Options]
    pad (size-text m1) + 10 - m1/size * 1x0
    m2: menu-list "Help" 100 with [menu: menu-Help]
    box menu-color 2000x20
    origin 20x40   space 20x20   below
    a1: area wrap with [colors: [254.254.254 248.248.248]]
    b1: btn "Submit" [write clipboard:// a1/text alert "Copied"]
]

Wednesday, 2 October 2013

RSS reader

RSS is a link containing usually all website updates, now you can read your favorite RSSes with Rebol:



Here is the sourcecode:

REBOL [
    Title: "RSS feed reader"
    Purpose: "Live Bookmarks"
    Date: 2007-07-20
    Version: 2.0.6
    Author: "Piotr Gapinski"
    Email: {news [at] rowery! olsztyn.pl}
    File: %rss.r
    Url: http://rowery.olsztyn.pl/narg/rebol/rss
    Copyright: "Olsztynska Strona Rowerowa http://www.rowery.olsztyn.pl"
    License: "GNU General Public License (Version II)"
    Library: [
        level: 'intermediate
        platform: 'all
        type: [tool]
        domain: [web]
        tested-under: [
            view 1.3.1   on [Linux]
            view 1.3.2   on [Linux WinXP]
        ]
        support: none
        license: 'GPL
    ]
    Zmiany: {
        2.0.6 2007-07-20
        - funkcja iconv umozliwia pelna obsluge UTF-8; nieznane znaki sa zamieniane na "."
        - standardem docelowym nie moze byc UTF-8, zrodlowym nie moze byc ASCII
        - local-charset jest inicjalizowany tylko raz na poczatku dzialania skryptu
        2.0.5 2007-07-12
        - znaki UTF-8 skladajace sie z trzech oktetow sa usuwane
        - path-thru potrafi obslugiwac url bez nazwy pliku
        2.0.4 2007-04-03
        - wybieranie rss za pomoca klawiatury powoduje aktualizacje listy kanalow
        2.0.3 2007-03-22
        - read-thru potrafi zapisywac w cache pliki zawierajace znaki specejalne;
          mozliwe dzieki podmianie funkcji path-thru
        2.0.2 2007-03-12
        - ctx-rss-xml/escape-html domyslnie usuwa nieznane entity html
        - zamienione kody znakow zet i ziet dla utf-8; zobacz standards/utf-8
        - docelowe kodowanie znakow jest uzaleznione od systemu operacyjnego;
            zobacz ctx-rss-xml/to-local-charset
        2.0.1 2007-03-09
        - obsluga polskich znakow w standardzie UTF-8; zobacz ctx-rss-xml/iconv
        - obsluga znacznikow ldquo, rdquo oraz rsquo; zobacz ctx-rss-xml/escape-html
    }
]
if system/version < 1.3.1 [to error! "RSS feed reader requires Rebol/View 1.3.1 or greater"]
secure allow
if error? err: try [
ctx-rss-hosts: context [
    hosts: [
        ; [site "nazwa serwisu" url url!-pliku-rss refresh time!-do-odswiezenia]
        ; Linux
        [site "Linuxnews.pl" url http://linuxnews.pl/feed/ refresh 1:00]
        [site "jakilinux.org" url http://jakilinux.org/feed/]
        [site "7th Guard"     url http://rss.7thguard.net/7thguard.xml]
        [site "Linux.com"     url http://www.linux.com/index.rss]
       
        ; Slackware
        [site "Slackware Changelog" url http://riexc.r1g.edu.lv/stuff/slachrss.php]
        [site "Slackware SSA" url http://dev.slackware.it/rss/slackware-security.xml]
        [site "Develia.org"   url http://www.develia.org/news.rss20.en.xml]
       
        ; Software
        [site "KDE-Apps.org" url http://www.kde.org/dot/kde-apps-content.rdf]
        [site "Freshmeat"     url http://freshmeat.net/backend/fm-releases.rdf]
        [site "Google: CakePHP" url http://groups.google.com/group/cake-php/feed/rss_v2_0_msgs.xml]
        [site "Rails Trac"   url http://dev.rubyonrails.org/timeline?milestone=on&ticket=on&ticket_details=on&changeset=on&max=30&daysback=7&format=rss]
        [site "Google: RubyOnRails" url http://groups.google.com/group/rubyonrails/feed/rss_v2_0_msgs.xml]
        [site "Joel on Software" url http://www.joelonsoftware.com/rss.xml]
        ; Programming Languages
        [site "REBOLution"   url http://www.rebol.net/blog/carl-rss.xml]
        [site "Rebol3 Front Line" url http://www.rebol.net/r3blogs/rebol3-rss.xml]
        [site "Rebol.org"     url http://www.rebol.org/cgi-bin/cgiwrap/rebol/rss-get-feed.r]
        [site "PHP Home"     url http://www.php.net/news.rss]
        [site "Ruby Home"     url http://www.ruby-lang.org/en/index.rdf]
        [site "Mono Project" url http://www.mono-project.com/news/index.rss2]
       
        ; DB
        [site "MySQL"         url http://dev.mysql.com/mysql.rss]
        [site "PostgreeSQL"   url http://www.postgresql.org/news.rss]
        [site "OTN Headlines" url http://www.oracle.com/technology/syndication/rss_otn_news.xml]
        ; Amiga
        [site "Polski Portal Amigowy" url http://www.ppa.pl/newsy/b2rss.xml]
        [site "EXEC.pl" url http://www.exec.pl/news.rss]
        ; Inne
        [site "Rowery!Olsztyn" url http://www.rowery.olsztyn.pl/wiki/feed.php refresh 2:00]
        [site "DCResource"   url http://www.dcresource.com/newsfeed/news.rdf]
    ]
    def-refresh: 1:00
    set 'rss-site has [site] [
        ; zwraca liste nazw serwisow rss
        site: copy []
        foreach rss hosts [append site rss/site]
        return site
    ]
    set 'load-rss func [
        "Wczytuje RSS serwera okreslonego pozycja w liscie serwerow; Zwraca string! lub none!"
        num [integer!] "numer sajtu"
        /force "wymusza aktualizacje danych"
        /local url dat] [
        attempt [
            url: to-url hosts/:num/url
            dat: either any [not (valid-rss num) force] [read-thru/update url] [read-thru url]
            to-string dat
        ]
    ]
    set 'valid-rss func [
        "Sprawdza czy dane w cache sa aktulne; Zwraca wartosc logic!"
        num [integer!] "numer sajtu"
        /local max-age] [
        if not attempt [exists? path-thru hosts/:num/url] [return false]
        max-age: any [
            attempt [to-time hosts/:num/refresh]
            def-refresh
        ]
        ((rss-datetime num) + max-age) > now
    ]
    set 'rss-datetime func [
        "Pobiera date pobrania danych do cache; Zwraca wartosc date!"
        num [integer!] "numer sajtu"] [
        any [
            attempt [modified? path-thru hosts/:num/url]
            now
        ]
    ]
]
ctx-rss-xml: context [
    standards: [
        ; tabela standardow zamiany 18 polskich znakow (duze/male)
        windows-1250 [165 198 202 163 209 211 140 143 175 185 230 234 179 241 243 156 159 191]
        iso-8859-2 [161 198 202 163 209 211 166 172 175 177 230 234 179 241 243 182 188 191]
        utf-8 [260 262 280 321 323 211 346 377 379 261 263 281 322 324 243 347 378 380]
        ascii [065 067 069 076 078 079 083 090 090 097 099 101 108 110 111 115 122 122]
    ]
    local-charset: select standards any [select [4 ascii 3 windows-1250] (fourth system/version) 'ascii]
   
    to-local-charset: func [
        "Zmienia standard polskich znakow; Zwraca string! po konwersji"
        str [string!] "tekst do konwersji"
        encoding [string! none!] "standard zrodlowy"] [
        encoding: attempt [to-word to-string encoding]
        iconv str any [(select standards encoding) standards/utf-8] local-charset
    ]
    iconv: func [
        "Konwertuje polskie znaki w tekscie; Zwraca string! po konwersji"
        str [string!] "tekst do konwersji"
        inp [block!] "tablica konwersji (wejsciowa)"
        out [block!]   "tablica konwersji (wyjsciowa)"
        /local i j c here] [
        ; standardem docelowym nie moze byc UTF-8, zrodlowym nie moze byc ASCII
        if any [
            same? inp out
            same? inp standards/ascii
            out/1 > 255 ; foreach code out [if code > 255 [break/return true]]
        ][return str ]
       
        parse/all str [
            any [
                here: skip (
                    c: first here
                    if all [(inp/1 < 255) (c > 127)] [
                        ; znaki narodowe maja kod > 127
                        any [
                            none? i: attempt [index? find inp to-integer c]
                            change here to-char out/:i
                        ]
                    ]
                    if all [(inp/1 > 255) (c > 127)] [
                        ; UTF-8
                        ; znaki < 128 sa przepuszczane bez zmian
                        either all [(c > 191) (c < 224)] [
                            ; dwa okrety
                            i: ((to-integer c) and 31) * to-integer (power 2 6)
                            i: i or (to-integer (second here) and 63)
                            remove/part here 2
                        ][
                            ; trzy oktety
                            i: ((to-integer c) and 15) * to-integer (power 2 12)
                            i: i or ((to-integer (second here) and 63) * to-integer (power 2 6))
                            i: i or (to-integer (third here) and 63)
                            remove/part here 3
                        ]
                        insert here any [
                            if none? j: attempt [index? find inp i] ["."]
                            to-char out/:j
                        ]
                    ]
                ) :here
                skip
            ]
        ]
        head here
    ]
    tokens: ["amp" {&} "lt" {<} "gt" {>} "nbsp" { } "apos" {'} "quot" {"} "raquo" {-} "ldquo" {"} "rdquo" {"} "rsquo" {'}]
    escape-html: func [
        "Zamienia encje HTML na tekst; Zwraca string! po konwersji"
        text [string!] "tekst do konwersji"
        /local here there entity] [
        entity: complement charset { :;<>&#}
        parse/all text [
            any [
                here:
                end break
                | "&"
                    [
                    "#" copy item to ";" skip there: (
                        remove/part here there
                        attempt [insert here form to-char to-integer item]
                    )
                    :here
                    | copy item some entity ";" there: (
                        remove/part here there
                        any [
                            none? code: select tokens item
                            insert here code
                        ]
                    )
                    :here
                    ]
                | ["<![" "CDATA[" | "]]>"] there: (remove/part here there) :here
                | skip
            ]
        ]
        head here
    ]
    strip-html: func [
        "Usuwa znaczniki HTML z tekstu; Zwraca string! po konwersji"
        text [string!] "tekst do konwersji"
        /local page] [
        remove-each tag page: load/markup escape-html (trim/lines/tail text) [tag? tag]
        form page
    ]
    rss: copy [] ; miejsce na wynikowa tablice informacji
    ctx: copy [] ; kontekst znalezionego znacznika

    emit: func ['scope desc] [
        desc: any [desc ""]
        repend ctx [scope (strip-html desc)]
    ]
    parts: [
        ["<channel" thru ">" (append rss 'channel ctx: copy [])] | </channel> |
        ["<image" thru ">" (repend rss [ctx 'image] ctx: copy [])] | </image> |
        ["<items" thru ">"] | </items> |
        ["<poll" thru ">" (repend rss [ctx 'poll] ctx: copy [])] | </poll> |
        ["<textinput" thru ">" (repend rss [ctx 'textinput] ctx: copy [])] | </textinput> |
        ["<item" thru ">" (repend rss [ctx 'item] ctx: copy [])] | </item> |
        [<title> copy title to </title> (emit 'title title)] |
        [<link> copy link to </link> (emit 'link link)] |
        [<url> copy url to </url> (emit 'url url)] |
        [<description> copy desc to </description> (emit 'description desc)] |
        [<pubdate> copy pubdate to </pubdate> (emit 'pubdate pubdate)] |
        [<dc:date> copy pubdate to </dc:date> (emit 'pubdate pubdate)] |
        [<dc:pubdate> copy pubdate to </dc:pubdate> (emit 'pubdate pubdate)] |
        skip
    ]
    rules: [
        some parts
        to end (repend rss [ctx])
    ]
    set 'parse-rss func [
        "Zamienia RSS XML na blok danych rebol; Zwraca wartosc logic!"
        scope [word!] "zakres danych (channel|image|item|poll|...)"
        dat [string!] "dane xml"
        f [any-function!] "funkcja callback; otrzymuje parametry scope jako argument (block!)"
        /local rc encoding] [
        rc: true
        ; pobieranie poszczegolnych newsow (item) oznacza koniecznosc odwiezenia calego rss
        if any [(empty? rss) (scope = 'item)] [
       
            ; konwertuj wykryty standard (domyslnie UTF-8)
            any [
                parse/all detab dat [
                    to "<?xml" thru "encoding" 2 skip
                    copy encoding to {"}
                    thru {?>} to end
                ]
                encoding: none
            ]
            dat: to-local-charset dat encoding
            clear rss
            clear ctx
            rc: parse/all detab dat rules
        ]
        if rc [
            ; dla kazdego elementu zakresu (scope) wywolaj funkcje callback
            ; parametrem funkcji callback jest blok danych zwiazany z danym zakresem
            ; na wszelki wypadek jest sprawdzane czy zakres (scope) jest typu word! co
            ; zapobiega przekazywaniu do callback przypadkowych danych
            foreach [item item-data] rss [if all [(word? item) (item = scope)] [f item-data]]
        ]
        return rc
    ]
]
ctx-rss-display: context [
    def-offset: 4x1 ; odleglosc XY od gornej ramki do pierwszego elementu listy newsow
    def-list-separator: on
    def-list-date: on
    def-list-desc: on
   
    pos-offset: def-offset
    browse-url: none
    list-box: none
    list-pane: none
    last-rss-num: 0
    ; funkcje przesuwajace liste newsow (scroll-list) oraz scrollera (scroller-value)
    ; przesuniecie slidera powoduje aktualizacje pozycji listy newsow
    scroll-list: func [value [number!]] [
        list-box/offset/y: negate value * (list-box/size/y - gui-news-list/size/y)
        show list-box
    ]
    scroller-value: func [distance [number!]] [
        delta-y: gui-news-slider/data + (distance * 20 / pos-offset/y)
        if delta-y < 0 [delta-y: 0]
        if delta-y > 1 [delta-y: 1]
        scroll-list gui-news-slider/data: delta-y
        show gui-news-slider
    ]
    ; funkcje wybierajace z listy nastepny (next-host) lub poprzedni (prev-host) serwis rss w liscie
    ; lista serwisow jest pobierana bezposredniu z VID gui-hosts-list
    next-host: has [data] [
        data: skip gui-hosts-list/data 1
        if not empty? data [gui-hosts-list/data: data]
        index? gui-hosts-list/data
    ]
    prev-host: does [index? gui-hosts-list/data: skip gui-hosts-list/data -1]
    clear-display: does [
        ; inicjalizuje zmienne gui; funkcja musi byc wywolana przed dostepem do list-pane i list-box
        ; odswiezenie gui nastepuje w funkcji display-rss
        pos-offset: def-offset
        list-box: make-face/size 'box as-pair gui-news-list/size/x 1
        gui-news-list/pane: list-box
        list-pane: list-box/pane: copy []
    ]
    display-error: func [
        "Wyswietla informacje o bledzie; Odswiezenie gui nastepuje w funkcji display-rss"
        text [string!] "naglowek bledu"
        desc [string! none!] "opis bledu"] [
        clear-display
        hide gui-browse-button
        append-news text none desc none
    ]
    parse-rss-items: func [
        "Callback funkcji parse-rss; Dodaje do listy koleny news"
        news [block!] "block danych przekazany przez parse-rss"
        /local link desc date] [
        desc: attempt [news/description]
        link: attempt [news/link]
        date: any [
            attempt [form to-date skip news/pubdate 5]
            attempt [form to-date replace copy news/pubdate "T" " "]
            attempt [news/pubdate]
        ]
        attempt [append-news (form news/title) link desc date]
    ]
    parse-rss-channel: func [
        "Callback funkcji parse-rss; Pobiera channel/link url do zmiennej globalnej browse-url"
        channel [block!] "block! danych przekazany przez parse-rss"] [
        browse-url: none
        any [
            attempt [
                browse-url: to-url channel/link
                show gui-browse-button
            ]
            hide gui-browse-button
        ]
    ]
    set 'display-rss func [
        "Wyswietla rss serwera okreslonego pozycja w liscie serwerow; Zwraca wartosc logic!"
        num [integer!] "numer sajtu"
        /force "wymusza aktualizacje danych"
        /local desc link nf error list-lay tl][
        either all [(valid-rss num) (not force)][
            ; jezeli nie bylo zmiany rss - nie odswiezaj listy
            if (last-rss-num = num) [return true]
            nf: false
            dat: load-rss num
        ][
            nf: flash/with "Please Wait..." main-window
            dat: load-rss/force num
        ]
        last-rss-num: num
        ; upewnij sie ze gui-hosts-list zawiera poprawne dane o wybranym serwerze rss
        gui-hosts-list/data: skip gui-hosts-list/list-data (num - 1)
        gui-hosts-list/text: first gui-hosts-list/data
        attempt [
            ; hack! niestety wymaga by drop-down by wczesniej chociaz raz otwarty
            if list-lay: gui-hosts-list/list-lay [
                tl: first list-lay/pane
                ; zmien podswietlony element w liscie drop-down zgodnie z wyborem usera
                clear tl/picked
                append tl/picked gui-hosts-list/text
                ; przesun liste tak by nowy element byl widoczny
                tl/sld/data: (index? gui-hosts-list/data) / (length? gui-hosts-list/texts)
                do-face tl/sld tl/sld/data
            ]
        ]
        either not none? dat [
            clear-display
            gui-timer/text: form rss-datetime num
            error: not all [
                parse-rss 'item dat :parse-rss-items
                parse-rss 'channel dat :parse-rss-channel
                not empty? list-pane ; list-pane jest pusty gdy gui-news-list nie zawiera newsow
            ]
        ][
            ; dane nie zostaly zaladowane
            error: true
        ]
        if error [display-error {Error reading news feed!} {please check internet connection; press "refresh" button to try again}]
        if nf [unview/only nf]
        ; przesun scroller w polozenie wyjsciowe i przelicz pozycje suwaka
        gui-news-slider/data: 0
        gui-news-slider/redrag (gui-news-list/size/y / list-box/size/y)
        show [
            gui-news-slider
            gui-timer
            gui-news-list
            gui-hosts-list
        ]
        recycle
        return not none? dat
    ]
    make-header: func [
        "Tworzy naglowek wiadomosci wykorzystujac VID button; Zwraca object! VID BUTTON"
        hdr-text [string! none!] hdr-url [url! string! none!] hdr-size [pair!] hdr-offset [pair!]] [
        make get-style 'button [
            size: hdr-size
            offset: hdr-offset
            text: trim/lines/head/tail hdr-text
            edge: make edge [size: 0x0]
            font: make font [align: 'left size: 13]
            user-data: either none? hdr-url [none] [copy hdr-url]
            action: make function! [] [any [(none? user-data) (browse/only user-data)]]
        ]
    ]
    make-line: func [
        "Tworzy linie oddzielajaca naglowek wiadomosci od jej tresci; Zwraca object! VID BOX"
        line-size [pair!] line-offset [pair!]] [
        make get-style 'box [
            size: line-size ; minimalna wysokosc 'box wynosi 3pix
            offset: line-offset
            edge: make edge [color: coal size: 1x1]
        ]
    ]
    make-description: func [
        "Tworzy opis wiadomosci wykorzystujac VID txt; Zwraca object! VID TXT"
        desc-text [string! none!] desc-size [pair!] desc-offset [pair!]] [
        make get-style 'txt [
            size: desc-size
            offset: desc-offset
            text: trim/lines/head/tail desc-text
            font: make font [align: 'left color: black]
        ]
    ]
    make-pubdate: func [
        "Tworzy informcje o dacie publikacji wykorzystujac VID text; Zwraca object! VID TEXT"
        pubdate-text [string! none!] pubdate-size [pair!] pubdate-offset [pair!]] [
        make get-style 'text [
            size: pubdate-size
            offset: pubdate-offset
            text: trim/lines/head/tail pubdate-text
            font: make font [align: 'left color: black name: "arial" size: 11]
        ]
    ]
    append-news: func [
        "Dodaje pozycje do listy wyswietlanych newsow (list-box); Nie zwraca wartosci"
        text [string!] "tekst do wyswietlenia"
        link [string! none!] "link powiazany z tekstem do wyswietlania lub none!"
        desc [string! none!] "dodatkowe informacje do wyswietlenia lub none!"
        date [string! none!] "data publikacji"
        /local btn btn-size wh] [
        btn-size: as-pair (gui-news-list/size/x - pos-offset/x - 8) (16)
        jobs: [
            ; [check this] [do that]
            [true] [make-header text link btn-size pos-offset]
            [def-list-separator] [make-line (as-pair btn-size/x 3) pos-offset]
            [all [def-list-date date]] [make-pubdate date btn-size pos-offset]
            [all [def-list-desc desc]] [make-description desc btn-size pos-offset]
        ]
        foreach [check job] jobs [
            if do check [
                btn: do job
                ; jezeli tekst nie miesci sie w jednej linijce to zmien wysokosc przycisku (Y)
                if not zero? (wh: size-text btn) [btn/size/y: wh/y + 4]
                append list-pane btn
                list-box/size/y: list-box/size/y + btn/size/y
                pos-offset: as-pair (pos-offset/x) (pos-offset/y + btn/size/y)
            ]
        ]
        ; dodaj odstep miedzy poszczegolnymi newsami
        list-box/size/y: list-box/size/y + 4
        pos-offset/y: pos-offset/y + 4
    ]
    set 'look-and-feel stylize [
        cycle-list: drop-down 180 rows 8 texts rss-site black [
            ; self/data musi zawierac index? do pozycji elementu w liscie self/list-data
            ; z indexu korzystaja wszystkie funkcje gui
            gui-hosts-list/data: find gui-hosts-list/list-data gui-hosts-list/data
            display-rss index? gui-hosts-list/data
        ]
        refresh-btn: btn #"r" "Refresh" [display-rss/force index? gui-hosts-list/data]
        browse-btn: btn #"b" "Browse Site" [if not none? browse-url [browse/only browse-url]]
        about-btn: btn-help [browse http://www.rebol.org/cgi-bin/cgiwrap/rebol/view-script.r?script=rss.r]
        news-list: box 336x260 edge [size: 1x1 color: black]
        news-slider: scroller 16x260 edge [size: 1x1 color: black] [scroll-list value]
        refresh-time: info 200 middle form now edge [size: 0x0]
            feel [engage: func [face action event] [if action = 'time [do-face face none]]]
            [display-rss index? gui-hosts-list/data]
    ]
       
    insert-event-func [
        switch event/type [
            ; obsluga kolka w myszce (przesuwanie listy newsow)
            scroll-line [scroller-value event/offset/y]
            ; obslga klawiszy kursora
            key [
                switch event/key [
                    up [scroller-value -3]
                    down [scroller-value 3]
                    left [display-rss prev-host]
                    right [display-rss next-host]
                ]
            ]
        ]
        event
    ]
]
if get-env "KDEDIR" [
    attempt [
        unprotect 'browse
        browse: func [value [any-string!] /only][call reform ["konqueror" rejoin [{"} value {"}]]]
    ]
]
attempt [
    unprotect 'path-thru
    path-thru: func [
        "Return a path relative to the disk cache."
        url /local purl path
    ][
        if file? url [return url]
        if not all [purl: decode-url url purl/host] [return none]
        path: rejoin [view-root/public slash purl/host slash any [purl/path ""] any [purl/target ""]]
        any [(suffix? path) append path "index.txt"]
        foreach ch [{?} {*} {"} {<} {>} {|}] [replace/all path ch "_"]
    ]
]
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main-window: center-face layout [
    backdrop img effect [tile-view]
    key (escape) [unview quit]
    styles look-and-feel
    origin 2x2 space 2x2 across
    gui-hosts-list: cycle-list pad 08x0 refresh-btn
    gui-browse-button: browse-btn about-btn return
    gui-news-list: news-list
    gui-news-slider: news-slider return
    gui-timer: refresh-time rate 00:15:00
]
display-rss 1
view/title main-window "Live Bookmarks"
][
    alert rejoin [{We apologize, an unexpected error occurred (} get in disarm err 'id { error)}]
]
quit