Monday, 7 April 2014

VID usage

Every rebol user should read this script, it's a guide that cover the most important aspect of rebol: VID. Clicking on the examples, activate them.



Here is the source code:

REBOL [
    File: %vid-usage.r
    Date: 09-Jan-2004  
    Title: "VID Usage"
    Purpose: "VID Usage Tutorial with Runnable Examples"
    Version: 1.2
    Author: "Cybarite"
    Source: {
        Based on %easy-vid.r by Carl Sassenrath.
        Clips from various sites including email that are attributed in the section
        }
    library: [
        level: 'intermediate
        platform: 'all
        type: [tutorial]
        domain: [gui]
        tested-under: [view 1.2.8.3.1 on W2K]
        support: none
        license: none
        see-also: none
    ]
   
]

flash "Fetching image..."
read-thru/to http://www.rebol.com/view/demos/palms.jpg %palms.jpg
read-thru/to http://www.rebol.com/graphics/reb-logo.gif %rebo-logo.gif
read-thru/to http://www.rebol.com/view/bay.jpg %bay.jpg
pic: %palms.jpg
unview
customer: make object! [; this sets a default customer object in case the user does not push the samples in order
        name: "Rosetta Stone"
        date-of-birth: 14-March-1959        
]
stylize/master [text-note: txt maroon bold]         ; this sets a default for users who run the samples out of order
; polished is an image that is embedded in this script file
; so that no outside files need to be loaded.
; This technique is used in many of the REBOL samples

polished: load #{      
89504E470D0A1A0A0000000D49484452000000670000003808020000006FFB71
8C0000001374455874536F667477617265005245424F4C2F566965778FD91678
0000039B49444154789CCD9BD14E2B310C44F3FFFF521E2AC1C395E00589EF02
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EE1BDCA216275C1CCFBD0A07F35A40A6CC05A1357E6BF512D26DC470BAC927A3
B0078A42DD22E10000000049454E44AE426082
}

content: {VID Usage - REBOL Visual Interfaces
===Updates
---09-Jan-2004
* Fixed slider initialize.
* Focus section was not parsed out. --- fixed
* Fixed some text errors for the parsing of ===
---07-Jan-2004
* Revived vid-usage.r
* added more examples from the script library
* manage source as vid-usage.leo an outliner file
---12-August-2001
Added supply examples. See:
!List/Supply
!List With Supplied Data
!Supply List With Scroll
---13-August-2001
!Add Subpanel example ported by Anton
===Caveats
---Work In Progress
This is a work in progress. Whether the progress will continue depends on the feedback.
---All Rights Reserved
The work is based on the documentation of REBOL View provided by REBOL Technology and its mailing list.
All rights to this documentation remain the property of REBOL Technology.
---Plagiarized Examples
Things are shamelessly plagiarized.   There are many experts on the mailing list whose work is included here; most notably the examples from the REBOL documentation.
---Approach
The approach that this document uses is to use REBOL/View/VID to demonstrate its abilities and give a visual tutorial. To enable this some changes have been made to the core %easyvid.r program from Carl Sassenrath. A scoll bar was added to the right pane because it was just too difficult to constrain the examples to the screen real estate that was available.
---Order Order
The order of the items needs some work. The easyvid presentation approach today does not allow for the drilling down and expansion of an outline tree which is needed for a large amount of documentation.
The preferred approach is to put a multi-level tree for navigation purposes and then allow navigation up and down the tree.
===To Do
* make this a true outline tree
* re-organize it better
* update as requested and as possible by suggestions on AltME's REBOL world under group EasyVID
* correct numerous flaws
* better scrolling implementation using the updates that have been used in other examples such as Didier's %delete-email.r
* allow clipping to clipboard like AltME does on a row for the source examples
===Introduction to VID
With REBOL/View it's easy and quick to create your own user
interfaces. The purpose of this tutorial is to teach you the
basic concepts or REBOL/View interfaces in about 20 minutes.
VID is REBOL's Visual Interface Dialect.   A dialect is an
extension of the REBOL language that makes it easier to express
or describe information, actions, or interfaces.   VID is a
dialect that provides a powerful method of describing user
interfaces.
VID is simple to learn and provides a smooth learning curve from
basic user interfaces to sophisticated distributed computing
applications.
---Creating VID Interfaces
VID interfaces are written in plain text. You can use any text
editor to create and edit your VID script. Save your script
as a text file, and run it with REBOL/View.
!Note: Using a word processor like Word or Wordpad is not
recommended because files are not normally saved as text.
If you use a word processor, be sure to save the output
file as text, not as a document (.doc) file.
Recommendation: Look at TextPad from http://www.textpad.com
===Minimal VID Example
Here is a minimal VID example.   It creates a window that
displays a short text message.   Only one line of code
is required:
    view layout [text "Hello REBOL World!"]
You can type this line at the REBOL console prompt, or save
it in a text file and run it with REBOL.   If you save it
as a file, the script will also need a REBOL header. The
header tells REBOL that the file contains a script. Here
is an example of the script file with a header:
    REBOL [Title: "Example VID Script"]
    view layout [text "VID Example!"]
You can also add buttons and other gadgets to the script. The
example below displays a text, list of files, and a button:
    view layout [
        h2 "File List:"
        text-list data read %.
        button "Great!"
    ]
!Click on the examples above to see how they will appear on your
screen.   Click on their close box to remove them.   All of the
examples that follow can be viewed this way.
===Window Management
The code that displays the examples also shows how to manage the number of windows that are open.
Look at the show-example block in the code near the end of this script.
The location of the example window is also managed here by keeping track of the co-ordinates for the sample. After the sample window is moved, the next use will open at the same location.
===Pre-loaded Images
For this script, the image which represented a Portable Network Graphic
definition of an image is held in the script and loaded.
For a small number of graphics, this can achieve some packaging and
performance benefits.
The image "polished" is used through the script to achieve the polished steel
look that is one the outer frame.
    backtile polished orange
    button 200x50 "Polished Steel Look" polished
===Two Basic Functions
Two functions are used to create graphical user interfaces
in REBOL: VIEW and LAYOUT.
The LAYOUT function creates a set of graphical objects.   These
objects are called faces.   You describe faces with words and
values that are put into a block and passed to the LAYOUT function.
The VIEW function displays faces that were previously created by
LAYOUT. The example below shows how the result of
the LAYOUT function is passed to the VIEW function, and the
interface is displayed.
    view layout [
        text "Layout passes its result to View for display."
        button "Ok"
    ]
Click on the above example to view it.
!Note: the block provided to a layout is not normal REBOL code,
it is a dialect of REBOL.   Using a dialect makes it much easier
to express user interfaces.
===Styles
Styles describe faces.   The examples above use the text and
button styles to specify a text line and a button. REBOL has
40 predefined face styles. You can also create your own custom
styles.   Here are a few example styles:
    view layout [
        h1 "Style Examples"
        box brick 240x2
        vtext bold "There are 40 styles built into REBOL."
        button "Great"
        toggle "Press" "Down"
        rotary "Click" "Several" "Times"
        choice "Choose" "Multiple" "Items"
        text-list 120x80 "this is" "a list" "of text"
        across
        check
        radio radio
        led
        arrow
        below
        field "Text Entry"
    ]
The words like backdrop, banner, box, text, and button are styles.
===Facets
Facets let you modify a style.   For instance, you can change the
color, size, text, font, image, edge, background, special
effects, and many other facets of a style.
Facets follow the style name.   Here is an example that shows
how you modify the text style to be bold and navy blue:
    view layout [txt bold navy "Facets are easy to use."]
The words bold and navy are not styles.   They are facets that
modify a style. Facets can appear in any order so you don't
have to remember which goes first.   For example, the line
above could be written as:
    view layout [txt "Facets are easy to use." navy bold]
Many facets that can be specified.   Here is an example that
creates bold red text centered in a black box.
    view layout [txt 300 bold red black center "Red Text"]
You can create facets that produce special effects, such
as a gradient colored backdrop behind the text:
    view layout [
        vtext bold "Wild Thing" effect [gradient 200.0.0 0.0.200]
    ]
===Custom Styles
Custom styles are shortcuts that save time.   When you define a
custom style, the facets you need go into the new style.   This
reduces what you need to specify each time you use the style,
and it allows you to modify the look of your interface by
changing the style definitions.
For example, here is a layout that defines a style for red
buttons.   The style word defines the new style, followed by
the old style name and its facets.
    view layout [
        style red-btn button red
        text "Testing red button style:"
        red-btn "Test"
        red-btn "Red"
    ]
So, if you wanted to create a text style for big, bold,
underlined, yellow, typewriter text:
    view layout [
        style yell tt 220 bold underline yellow font-size 16
        yell "Hello"
        yell "This is big old text."
        yell "Goodbye"
    ]
===Master Stylesheet
REBOL holds its styles in a master stylesheet. When you are
sure that you want to share them without having to add the
style sheet line then do it as follows:
First add the style to the master sheet:
    button 200x50 "Define text-note as maroon bold text" [stylize/master [
        text-note: txt maroon bold      
    ]]
    button 200x50 "Define text-note as white italic text" [stylize/master [
        text-note: txt white italic    
    ]]
Then invoke it:
    view layout [
        across
        size 200x200
        return text-note "This shows a master stylesheet style in use."
        return text-note "This shows another usage of the same style."
        return text-note "If you want to see the other style displayed, click the Add Style section again and then use the other button"
    ]
   
   
===Note About Examples
!From this point forward, all examples will assume that
the view and layout functions are provided.   Only the layout
block contents will be shown.   To use these examples in your
scripts, you will need to put them in a layout block, as was
shown earlier.
For example, code that is written as:
    view layout [button red "Test it"]
will now appear as:
    button red "Test it"
===Face Sizes
The size of a face depends on its style.   Most styles, such as
buttons, toggles, boxes, checks, text-lists, and fields, have a
convenient default size.   Here are some examples.
    button "Button"
    toggle "Toggle"
    box blue
    field
    text-list
If no size is given, text will automatically compute its size,
and images will use whatever their source size is:
    text "Short text line"
    text "This is a much longer line of text than that above."
    image %palms.jpg
You can change the size of any face by providing a size facet.
The size can be an integer or a pair.   An integer specifies
the width of the face.   A pair specifies both width and height.
Images will be stretched to fit the size.
    button 200 "Big Button"
    button 200x100 "Huge Button"
    image %palms.jpg 50x50
    image %palms.jpg 150x50
===Color Facets
Most styles have a default color.   For example the body of
buttons will default to a teal color.   To modify the color of
a face, provide a color facet:
    button blue "Blue Button"
    h2 red "Red Heading"
    image %palms.jpg orange
Colors can also be specifed as tuples. Each tuple contains three
numbers: the red, green, and blue components of the color. Each
component can range from 0 to 255. For example:
    button 200.0.200 "Red + Blue = Magenta" 200
    image %palms.jpg 0.200.200 "Green + Blue"
Some face styles also allow more than one color.   The effect of
the color depends on the style.   For text styles the first color
will be used for the text and the second color for the background
of the text:
    txt "Yellow on red background" yellow red
    banner "White on Navy Blue" white navy
For other styles, the body of the face is the first color, and
the second color will be used as its alternate.
    button "Multicolor" olive red
    toggle "Multicolor" blue orange
===Layout Commands
To drop user interface elements on the canvas according to VIDs
directional layout controls
---Across
You are placing elements in a row orientation
   
    across
    return button "A" button "B" button "C"
    return button "D" button "E" button "F"
   
---Below
You are placing elements in a column orientation
    below
    return button "A" button "B" button "C"
    return button "D" button "E" button "F"
---Mix
You can mix the directional controls
    across
    return button "A" button "B"
    below button "C"
    across button "D" button "E" button "F"
---Padding
The pad keyword creates extra padding between styles. It uses a pair or integer value. When it is an integer, spacing is created either horizontally (across) or vertically (below). When it is a pair, the spacing will be created both horizontal and vertically. The following example illustrates both uses. First, the buttons "one" and "two" are padded with an integer representing 40 pixels in one direction. Then the buttons "three" and "four" are padded with a pair representing 40x40 pixels.
    across
    button "one" pad 40 button "two" return
    button "three" pad 40x40 button "four"
Padding can be negative.
   
        backtile polished orange
        pad 200x200 button "A"
        pad -100x-100 button "B"
       
---Guide
A guide is a virtual alignment control
      title "Buttons Without A Guide"
    button "one"   button "two"   return
    button "three" button "four" return
    button" five" button "six"
With an implicit guide location
    title "Buttons With An Implicit Guide Location"
    guide
    button "one"   button "two"   return
    button "three" button "four" return
    button" five" button "six"
With an explicit guide location
    across title "Buttons With An Explicit Guide Location"
    guide 55x100
    button "one"   button "two"   return
    button "three" button "four" return
    button" five" button "six"
   
===Tabstops
Tabs can be used for alignment.
---Across
    tabs 200 ; sets tabs every 200 pixels  
    across button 20 "A" tab button 20 "B" tab button 20 "C"
    tabs 100 ; sets tabs every 100 pixels  
    return button 20 "D" tab button 20 "E" tab button 20 "F"
   
---Below
    tabs 200 ; sets tabs every 200 pixels  
    below button 20 "A" tab button 20 "B" tab button 20 "C"
    tabs 100 ; sets tabs every 100 pixels  
    return button 20 "D" tab button 20 "E" tab button 20 "F"
---Explicit Settings
Tabstops can be set at explicit values
    tabs [100 124   166 212 300]
    across tab button 20 "A" tab button 20 "B" tab button 20 "C" tab button 20 "D"
   
===Color Facets
Most styles have a default color.   For example the body of
buttons will default to a teal color.   To modify the color of
a face, provide a color facet:
    button 200 blue "Blue Button"
    h2 red "Red Heading"
    image polished orange
Colors can also be specifed as tuples. Each tuple contains three
numbers: the red, green, and blue components of the color. Each
component can range from 0 to 255. For example:
    button 200.0.200 "Red + Blue = Magenta" 200
    image polished 0.200.200 "Green + Blue"
Some face styles also allow more than one color.   The effect of the color depends on the style.   For text styles the first color will be used for the text and the second color for the background of the text:
    txt "Yellow on red background" yellow red
    title "White on Navy Blue" white navy
For other styles, the body of the face is the first color, and the second color will be used as its alternate.
    button 200 "Multicolor" olive red
    toggle 200 "Multicolor" blue orange
From the mailing list, there was a problem reported in changing button color:
    view layout [
        b: button "New color" [
            b/color: random 255.255.255
            show b
        ]
    ]
   
And the answer was that the gradient of the color was preventing this change from working:
    style color-changing-button button 0.0.0         ; new style overwrites gradient effect
    b: color-changing-button "New color" [
        b/color: random 255.255.255
        show b
    ]
===Text Facets
Most faces will accept text to be displayed.   Even graphical faces can display text.   For example, the box and image faces will display text if it is provided:
    box blue "Box Face"
    image polished "Image Face"
Most button faces will accept more than one text string. The strings will be shown as alternates as the face is selected.
    button 200 "Up" "Down"
    toggle 200 "Off" "On"
    rotary 200 "Red" "Green" "Blue" "Yellow"
    choice 200 "Monday" "Tuesday" "Wednesday" "Thursday" "Friday"
    text-list 200 "Monday" "Tuesday" "Wednesday" "Thursday" "Friday"
When other datatypes need to be displayed as text, use the form function to convert them first:
    button 250 form now
    field form first read %.
   
===Normal Text Style
Normal text is light on dark and can include a number of facets to set the font, style, color, shadow, spacing, tabbing, and other attributes.
    text "Normal"
    text "Bold" bold
    text "Italic" italic
    text "Underline" underline
    text "Bold italic underline" bold italic underline
    text "Big" font-size 32
    text "Serif style text" font-name font-serif
    text "Spaced text" font [space: 5x0]
Text also includes these predefined styles:
    title "Title" 200
    vh1 "vh1"
    vh2 "vh2"
    vh3 "vh3"
    vh4 "vh4"
    label "Label"
   
   
===Document Text Style
Document text is dark on light and can also include a number of facets to set the font, style, color, shadow, spacing, tabbing, and other attributes.
    txt "Normal"
    txt "Bold" bold
    txt "Italic" italic
    txt "Underline" underline
    txt "Bold italic underline" bold italic underline
    txt "Big" font-size 32
    txt "Serif style text" font-name font-serif
    txt "Spaced text" font [space: 5x0]
Document text also includes these predefined styles:
    title "Centered title" 200
    h1 "Heading 1"
    h2 "Heading 2"
    h3 "Heading 3"
    h4 "Heading 4"
    tt "Typewriter text"
===Text Entry Fields
Text input fields accept text until the enter or tab key is pressed.   A text input field can be created with:
    field
To make the field larger or smaller, provide a width:
    field 30
    field 300
Fields will scroll when necessary.
Larger amounts of text can be entered in an area.   Areas also accept an enter key and will break lines.
    area
You can also specify the area size:
    area 160x200
To force the text in an area to wrap rather than scroll horizontally, provide the wrap option:
    area wrap
===Text Setting
To set the value of a text field under program control, use /text: e.g.
    across backtile polished
    return t1: txt       200 "This is some original text"
    return f1: field     200 "Some field text"  
    return a1: area   {Some original area text.} wrap 200x80
    return button 200 "Change Text" [
        t1/text: "Some different text"
        f1/text: "Some new field text"
        a1/text: {Some wrapping text in the^/ area field to^/ show that this^/ is supported}
        show [t1 f1 a1]
    ]
   
===Text Lists
Text lists are easy to create.   Here is an example.
    text-list "Eureka" "Ukiah" "Mendocino"
You can also provide it as a block:
    text-list data ["Eureka" "Ukiah" "Mendocino"]
Almost any type of block can be provided. Here is a list of all the files in your current directory:
    text-list data read %.
Here is a list of all the words REBOL has scanned:
    text-list data first system/words
===Scrolling Text List
A style to allow maintenance of lists from Brett Handley on the REBOL list:
        style updatable-text-list text-list
        with [
            update-slider: does [
                sld/redrag lc / max 1 length? head lines
            ]
        ]
        tl: updatable-text-list 300x100 data copy system/locale/months
        button   300x20 "Delete first entry on the list" [remove tl/data tl/update-slider show tl ]
        button 300x20 "Append the 'now' timestamp to list" [append tl/data mold now tl/update-slider show tl ]
===Text List Picked Values
    list-of-letters: text-list "a" "b" "c" "d" "e"
    button 200   "Pick Item 3" [
        clear list-of-letters/picked
        append list-of-letters/picked pick list-of-letters/data 3
        show list-of-letters
    ]
===Images
By default an image will be scaled to fit within a face.
    image 60x60 polished
    image polished red
Images can be framed in a number of ways:
    image 100x100 polished frame blue 5x5
    image 100x100 polished bevel
    image 100x100 polished ibevel 6x6
Most other faces can accept an image as well as text:
    box 100x100 polished
    button "Button" polished purple
    toggle "Toggle" polished blue red
    field bold   "This is a field." polished effect [emboss tile]
    field bold "This is another field." polished effect [brighten 100]
The image can be provided as a filename, URL, or image data.
===Backdrops
A backdrop can be a color, an effect, an image, or a combination
of the three.   For example a backdrop color would be written as:
    backdrop navy
    title "Color Backdrop" gold
To create a backdrop effect provide it on the line:
    backdrop effect [gradient 1x1 0.0.100 100.0.0]
    title "Gradient Backdrop" gold
A backdrop image can be a file, URL, or image data:
    backdrop polished
    title "Image Backdrop" red
The backdrop image can be colorized:
    size 400x500
    backdrop polished blue
    title "Blue Image Backdrop"
The image can include an effect:
    backdrop polished effect [fit gradcol 1x1 100.0.0 0.0.250]
    title "Gradient Image Backdrop"
   
===Backtile
To make a backdrop use a tile effect there are two options:
    backdrop polished effect [tile]
    banner "This shows a backdrop with a tile effect"
   
or
    backtile polished
    banner "This demonstrates backtile"
Note the difference between:
    size 400x500
    backdrop polished
    banner "Here one image is stretched to cover the canvas"
and
    size 400x500
    backtile polished
    banner "Here one image is repeated to cover the canvas"
   
===Effect Facets
A range of effects are supported for faces.   All of these effects are performed directly on the face when it is rendered. Here are examples of a few possible effects in top to bottom then left to right order:
    style polished-steel image 80x60 polished
    polished-steel effect [flip 1x1]
    polished-steel effect [rotate 90]
    polished-steel effect [reflect 1x1]
    polished-steel effect [crop 0x50 120x60 fit]
    polished-steel effect [grayscale]
    polished-steel effect [invert]
    polished-steel effect [difference 200.0.0]
    polished-steel effect [tint 80]
    return
    polished-steel effect [contrast 50]
    polished-steel effect [brighten 50]
    polished-steel effect [sharpen]
    polished-steel effect [blur]
    polished-steel effect [colorize 204.0.0]
    polished-steel effect [gradcol 1x1 150.0.0 0.0.150]
    polished-steel effect [gradmul 0x1 0.100.0]
    polished-steel effect [grayscale emboss]
Effects can be used in combination to create other interesting results.   However, keep in mind that the computations are performed in real time.   If complex combinations are required, a temporary image should be created with the to-image function.
===Actions
An action can be associated with almost any face. To do so, follow the face style with a block:
    button "Test" [alert "test"]
The block is used as the body of a function that is passed the face and the current value (if the face has one).   For example:
    toggle "Toggle" [alert form value]
    rotary "A" "B" "C" [alert form value]
    text "Click Here" [alert   face/text]
If a second block is provide, it is used for the alternate
actions (right key):
    button "Click Here" [view/new layout [txt "action"]] [view/new layout [txt "alt-action"]]
Use variables to modify the contents or state of other faces. For example, the slider will update the progress bar:
    slider 200x16 [p1/data: value show p1]
    p1: progress
!More action on actions needed...
===Show
After the state is changed for a user interface element, it must be re-drawn to be reflected on the user interface canvas.
Accomplish this with the show message.
    backtile polished
    across
    toggle "Toggle State"  
            [cybernetics?/data: not cybernetics?/data
                show cybernetics?]  
    return   label "Are you interested in cybernetics?" cybernetics?: check
One show command can be used for multiple user interface elements
        backtile polished orange
        across
        b1: check label "Red" return
        b2: check label "Green" return
        button 200 "Change State But No Refresh" [b1/data: not b1/data b2/data: not b2/data] return
        button "Show" [show [b1 b2]]
===Hide
A user interface element can also be hidden.
        backtile polished orange
        across
        c1: check
        hide-button: button "Hide" [hide c1] return
        show-button: button "Show" [show [c1 d2]]
The show-button action tries to show a user interface element 'd2' that does not exist.
REBOL/View ignores these.
===Invisible Faces
To make a button invisible when the view is opened, you can define an invisible button style
This approach sets the show? value to false when the user interface element is initialized.
    across
    style invisible-button button with [append init [show?: false]]
    late-shower: invisible-button "I'm Here" return
    return button 200 "Show Invisible Button" [show late-shower]
   
This works for the other visible user interface element.
===Focus
A user interface element can programmatically be given the focus.
    across backtile polished
    button 200 "Set focus to Phone Field" [focus f2]
    return label "Name: "   f1: field 100
    return label "Phone: " f2: field 100
    return button 200 "Remove focus from Phone Field" [unfocus f2]
    return button 200 "Hide the Phone Field" [hide f2] return
---Focus Defect
!Note that the tab function shows a hidden field. I have assumed that this is a defect. If a field is hidden, the tab button should not make it visible. This has been previously sent to feedback.
===Radio Buttons
A radio button is used to make a choice between mutually exclusive values. Your preferred programming language is REBOL or C++ or PL/1 or APL but it is only one of those.
            across backtile polished
            radio of 'programming-language pad 0x-4 label "REBOL" return
            radio of 'programming-language pad 0x-4 label "C++" return
            radio of 'programming-language pad 0x-4 label "PL/1" return
            radio of 'programming-language pad 0x-4 label "APL" return
To mix two groups of radio buttons on one screen, associate them with their groups using the "of 'word". In the above, the grouping is 'programming-language.
            across backtile polished
            radio of 'programming-language pad 0x-4 label "Language: REBOL" return
            radio of 'programming-language pad 0x-4 label "Language: C++" return
            radio of 'editor pad 0x-4 label "Editor: TextPad" return
            radio of 'editor pad 0x-4 label "Editor: Notepad" return
The padding in the above is needed to keep the label aligned with the radio button.
            across backtile polished orange
            radio of 'programming-language pad 0x-4 label "REBOL" return
            radio of 'programming-language           label "APL" return
           
           
           
           
===Radio Button Settings
A radio button is not very useful unless you can find out what its setting is and change that setting under program control.
            across backtile polished orange
            rebol-radio:     radio of 'programming-language   [programming-language: 'rebol] pad 0x-4 label "REBOL" return
            apl-radio:       radio of 'programming-language   [programming-language: 'apl]         label "APL" return
            button 200 "Toggle radio button" [
                    apl-radio/data: not rebol-radio/data: not rebol-radio/data
                    show [rebol-radio apl-radio]
            ]
           
===Check Box
---Purpose
A check box is used to allow user interface choices where the choices are not mutually exclusive.
        across backtile polished orange
        c1: check label "Likes animals" return
        c2: check label "Like Monkees" return
        c3: check label "Like The Animals"
       
---State
A check box is not much good if you can't get and set its state (on or off).
        across backtile polished orange
        c1: check label "Likes animals" return
        c2: check label "Like Monkees" return
       
    button "Set State" [
        c1/data: true
        show c1
        c2/data: false
        show c2
    ]


===Sensor
---Purpose
A sensor is an invisible user interface element. Using a sensor only makes sense in a few instances.
If you want a keycode action where there is no visible user interface element to link the action to then a sensor can be used.
This sensor code adds an Escape or Back or Enter action that will close the window.
    sensor 1x1 keycode [#"^M" #" " #"^(back)" #"^(ESC)"] [unview]
Or if you want to make portions of an image 'hot' instead of putting buttons on top of the image, then a sensor will achieve this.
        across backtile polished orange
        txt "Click on the upper left section of the gray image to invoke the sensor action"
        return animage: image 100x100 polished       ; here the image is just the polished area
        at animage/offset sensor 50x50 [alert "You pushed over the sensor"]
       
===Displaying Script Values
If the script has a standard format headings, including custom ones, these can be used in the application by picking them from the system/script/header.
        backtile polished
        across banner "About"
        return text font-size 16     rejoin ["Title: "           form system/script/header/title]
        return text font-size 16   rejoin ["Originator: "     form system/script/header/author]      
        return text font-size 16   rejoin ["Modifier: "       form system/script/header/modifier]
        return text font-size 16   rejoin ["Version: "       form system/script/header/version]
        return text font-size 16   rejoin ["Updated: "       form system/script/header/date]
        return button "OK" [unview]
===Toggle
A toggle button represents boolean state - either on or off. The button stays down until toggled again.
Colors and text can be paired for "on" and "off" state.
    toggle "Up" "Down" red blue
To set the state via program control, use:
        across backtile polished
        return t1: toggle "Up" "Down" red blue
        return button polished 204.0.0 100 "Toggle State" [
            t1/state: not t1/state
            show t1
        ]
===Rotary Buttons
Rotary buttons are a different sort of user interface device. They can cause some challenges because the state is what's showing so you have to blindly "toggle" to get to a state that you want.   But for quick and easy uses where the user is familiar with the options, they can be handy.   If you plan to use them for a long list of items such as shown   below, they might give you some usability concerns.
---Example
        across backtile polished
        rotary data ["First" "Second" "Third"]
---Setting State
        across backtile polished
        return r1: rotary data (my-options: ["First" "Second" "Third"])
        return button 200 "Change Rotary State" [
            r1/data: next r1/data
            if tail? r1/data [r1/data: head r1/data]
            show r1
        ]
---Example - Usability For Unfamiliar List Contents
The rotary button demonstrated here contains some information unfamiliar to most (Saturn's satellites). Use it to to set the state so that "Calypso" is set. Doable but without knowing the order each re-paint has to be checked to ensure that it is not "Calypso" before clicking again.   If you do click past the choice that you want, there is no back function so you have to cycle through again.
        return rotary data ["Pan" "Atlas" "Prometheus" "Pandora" "Epimetheus" "Janus" "Mimas" "Enceladus" "Tethys" "Telesto" "Calypso" "Dione" "Helene" "Rhea" "Titan" "Hyperion" "Iapetus" "Phoebe" ]
===Arrows
REBOL/View supports arrows as simple user interface elements. Actions can be associated with them.
---Arrowheads And Actions
By default, the arrow is 20x20
    across size 200x100
    backtile polished
    at 50x50 arrow left
        [alert "You pressed the left arrow"]
        [alert "You pushed the alternate button on the left arrow"]
    at 70x30 arrow up
    at 90x50 arrow right [alert "You pressed the right arrow"]
    at 70x70 arrow down
   
---Very Sharp Arrows
And with a little work the arrows and boxes can be merged to look sharper. Here is a "sharp at both ends" arrow from the block diagram script by Carl:
    origin 0
    backcolor white
    at 0x0 box 40x40 white effect [arrow rotate 270]
    at 110x0 box 40x40 white effect [arrow rotate 90]
    at 24x10 box black 100x20
   
---Arrow Blend
So that shows you how to make an arrow blend into your background
    size 100x100
    across backdrop gray
    at 50x50 box 40x40 gray effect [arrow rotate 90]
    at 40x67 box 25x5 black
   
===LED
LEDs would be used to display state (on or off).  
Clicking the LED toggles its state and changes its color.
LEDs do not support alternate mouse button actions.
    across banner "Light Emitting Diode"
    return
    l1: led 10x10 [alert "LED left mouse action"] label "Alert status"
    l2: led 10x10 [alert "LED left mouse action"] label "Network status"
    return button "Change state" [
        l1/data: not l1/data
        l2/data: not l2/data
        show [l1 l2]        
    ]
   
===Box
---Boxing
Draw boxes of any heigth and width with the box style
    box "Large Box" 200x400 polished orange
   
---Boxes As Lines
If you make the box narrow enough or short enough it is a line (or a dot).
    across size 300x300 backtile polished
    at 50x0 box 3x100 gold
    at 0x50 b1: box 100x3 gold
    at 10x10 box 5x5 red
   
---Boxes Can Grow
    across size 300x300 backtile polished
    at 150x0 b1: box 100x3 gold
    return pad 0x100 button "Grow Down" [
        for i 3 300 1 [
            b1/size/y: 1 + b1/size/y
            wait 00:00:00.01
            show b1
        ]
    ]
    return pad 0x100 button "Back Up" [
        for i 300 3 -1 [
            b1/size/y: b1/size/y - 1
            wait 00:00:00.01
            show b1
        ]
    ]
You might even find a use for it.
---Grid Effect
Not sure of the use for this yet but here is what you can do:
return box "Grid Lock" with [effect: [grid 20x20 8x8 4x3]] white 300x200

return box "Grid Lock" with [effect: [grid 20x20 5x5 3x3]] white - 80 300x200

===Frame
Earlier versions of REBOL VID supported frames in layouts such as
view layout [frame "This is the Bay" %bay.jpg]
These are no longer valid.
But frames can be put around some user interface devices:
    image 100x100 polished frame red
   
===List
A list is an iterated sub layout and takes a layout block that uses the Visual Interface Dialect. The styles in the layout will be repeated until there is no more room to fit them within the list dimensions.
---Why
A face can be iterated to create a number of virtual faces. For instance, when displaying a list of ten buttons, each of the buttons does not need to be created as a separate object. If the buttons only differ by a few facets (such as position, text, and action taken on selection), a model face can be created and iterated for its other position. This is useful when creating scrolling lists of files and other data sets that share the same appearance.
---Supply
Supply provides the data to the list for an iterated face.
    do [cnt: 0
        list-collection: [aqua sky water]    
    ]
    backtile polished orange
    across
    list-displayed: list 100x72 [
        origin 0 space 0x0 across
        color-field: txt bold 80x24
    ] supply [
            if none? one-color: pick list-collection count [exit]
            face/text: do pick [one-color] index
    ]
    return txt gold 180 "OK ... but not too useful"
---Supply Columns
Maybe adding some more columns would be better.
Here I'll add a column of buttons that display the color name
and a column of text strings in italic.
    do [
        cnt: 0
        list-collection: [aqua sky water gold silver coffee]    
    ]
    backtile polished orange
        across
        list-displayed: list 300x200 [
            origin 0 space 0x0 across
            color-field: txt bold 80x24
            color-button: button 80x24
            pad 5x1
            txt 100 italic
        ] supply [
                if none? one-color: pick list-collection count [exit]
                face/text: do pick [
                    [one-color]
                    [to-string one-color]
                    [rejoin ["   " to-string one-color]]
                    ] index
    ]
   
    return txt gold 300 {A bit more interesting but the last row repeats to fill the list size. Some of the other VID components will automatically stretch to fit the size needed (such as this txt field) but the list does not behave that way.   You have to make the list size fit its data or make it smaller and add a vertical scroll capability. That is shown a little later on.}
===List With Supplied Data
This example is to show adding action to the list
and adds a horizontal line between the rows.
    do [
        cnt: 0
        list-collection: [aqua sky water gold silver coffee]    
    ]
    backtile polished orange
        across
        list-displayed: list water edge [size: 6x6 color: silver]   350x96 [
            origin 0 space 0x0 across
            color-field: txt 60 [alert rejoin ["You pressed the " face/text " text field"]]
            pad 45x0            
            color-button: button 80 [alert rejoin ["You pressed the " face/text " button"]]
            pad 5x0
            txt 120 italic
            return box 350x1 white       ; this causes a horizontal line to appear between each row
        ] supply [
                if none? one-color: pick list-collection count [exit]
                face/text: do pick [
                    [one-color]
                    [to-string one-color]
                    [rejoin ["   " to-string one-color]]
                    ] index
    ]
===Supply List With Scroll
This example shows a supplied list with a scroll capability.
More colors are added to demonstrate scrolling.
Note that this is a verbose list of code where I added comments
for my understanding of how the scroll was linked to the list.
The same effect can be accomplished with fewer lines of code.
   
    do [; first this do block creates the data definitions needed.
        slider-position-clicked:   0
        count: 0    
        x: 450
        y: 300
        row-y: 16           ; the row height includes the data plus any separator lines
        list-size: to-pair reduce [x y]     ; this is the size of the display list  
        separator-size: to-pair reduce [x 1]
        slider-size: to-pair reduce [24 y ]
        list-collection: [
            aqua           bar-color   base-color     beige         black           blue           brick           brown      
        button-color   coal         coffee         crimson       cyan           forest         gold           gray      
        green           ivory       khaki           leaf           linen           magenta         main-color     maroon    
        mint           navy         oldrab         olive         orange         over-color     papaya         pewter        
            pink           purple       rebolor         red           sienna         silver         sky             snow
        tan             teal         violet         water         wheat           white           yellow        
        ]    
       
        supply-style: stylize [
                button-fixed: button left coal to-pair reduce [80 row-y]         ; these keep the row elements the same height
                text-fixed: txt to-pair reduce [160 row-y]          
        ]
       
        data-size: length? list-collection  
    ]
   
    backtile polished orange                         ; this section layouts out the list
       
        across
        list-position: at                                   ; the position is captured here in order to later put the slider beside it
        list-displayed: list linen
            edge [size: 6x6 color: tan]   list-size [
            origin 0 space 0x0 across
            styles supply-style
            text-fixed [alert rejoin ["You pressed the " face/text " text field"]]
            button-fixed [alert rejoin ["You pressed the " face/text " button"]]
            pad 5x0
            text-fixed 80 italic [alert rejoin ["You pressed the italic " face/text " text field"]]
            return box separator-size gray       ; this causes a horizontal line to appear between each row
        ] supply [
                count: count + slider-position-clicked  
                if none? one-color: pick list-collection count [exit]
        face/text:
            either count > (1 + data-size)
            [""]
            [
                            do pick [
                                    [one-color]                                                             ; this is supplied to the first txt field (text-fixed)
                                    [to-string one-color]                                           ; this is supplied to the button (button-fixed)
                                    [rejoin ["   " to-string one-color " "]]     ; this value is supplied to the last text-fixed field
                            ] index
                    ]
        ]
        ; now add a slider to the side of the list
        at list-position + (list-size * 1x0)                                 ; this finds the top right border of the list widget
        vertical-slider: slider slider-size to-integer y / row-y
        [
                    slider-position-clicked: vertical-slider/data   ; the slider has to be bound to the size of the list                
                        * ((1 + data-size) - ((y / (1 + row-y))))       ; including the row height
                    if slider-position-clicked <> count [
                        count: slider-position-clicked
                        show list-displayed
                    ]
                ]
===Slider
A slider is interactive user interface element. The data of a slider varies from 0 to 1.
    backtile polished   orange across
    slider-1: slider 200x40
    return button 200 "Move first slider to 50%" [
        slider-1/data: .5
        show slider-1
    ]
    return txt 200 "The second slider in this example is initialized to the 80% mark."  
    return slider 200x40 with [append init [data: .8]]
   
===Progress Indicator
The progress-1 face in this example is a progress indicator. Because it is only displaying information, it is non-interactive i.e. you can not change its value by dragging its edges.   The alternate button is not supported on a progress indicator.
    backtile polished   orange across
    slider 200x40 [
        progress-1/data: value
        field-1/text: join (to-integer (100 * value)) " %"
        show [progress-1 field-1]
    ]
    return progress-1: progress
    return field-1: field
===Panels
Panels are used to create sub-panes that can be more easily managed by grouping
the user interface devices on a panel. The first example below shows how to use panels for layout alignment. By creating a panel definition, all of the components defined within it are aligned relative to its origin.
    across backtile polished brick
    tabs 50
    return panel-1: panel 250x120 [
        backtile polished
        across
        return button water 200 "Button A"
        return button aqua   200 "Button B"
        return button sky   200 "Button C"
    ]
    at panel-1/offset + panel-1/size panel 60x90 [; start at the bottom right corner of panel-1
        backtile polished
        across
        return button tan       20 "1"
        return button coffee     20 "2"
    ]
   
---Multiple SubPanels example
This example from the REBOL html documentation shows how to easily hide and show sections of a user interface by displaying them on the face area of a box.  
        do [; define two panels
            panel1: layout [
                    origin 8x8
                    h2 "Panel 1"
                    field "Field 1"
                    field "Field 2"
                    button "The Answer" [alert "I know nothing."]
            ]
            panel2: layout [
                origin 8x8
                    h2 "Panel 2"
                    across
                    txt "X:"
                    slider 150x16
                    return
                    txt "Y:"
                    slider 150x16
                    return
                    check [panel2/color: maroon   show panel2]
                    txt "Don't click this"
                    return
                    check [panel2/color: silver   show panel2]
                    txt "Click this"
                    return
                ]
                panel1/offset: 0x0
                panel2/offset: 0x0
        ]
        vh2 "Subpanel Examples"     ; now demonstrate panel use
        guide
        pad 20
        button "Panel 1" [panels/pane: panel1   show panels]
        button "Panel 2" [panels/pane: panel2   show panels]
        button "Quit" [unview]
        return
        box 2x140 maroon
        return
        panels: box 220x140
        do [panels/pane: panel1]
       
===Simple Default Style Override
The style's default look can be overriden easily with one line of code.
For example, to make the default button size 200x200 with a water color, use
    style button button 200x200 water
    button "Big Blue Button" [unview]
To make the toggle some different default colors:
    style toggle toggle crimson sky
    toggle "Up" "Down"
Note that these stay in effect until they are overridden so if you use the default values, exercise some care unless you meant to do that.
===Image Maker
An option used by Carl in some of his programs is to let View create specific icons so that you have portability and more control of look of the image then if you referenced an external file such as gif that was a bullet display. Here's how to do that:
    do [
        make-image: func [xy wh eff] [
            eff: layout [
                size 20x20 at xy
                box wh effect eff
            ]
        eff/color: rebolor
        to-image eff
        ]
        dot: make-image 6x5 9x9 [gradient 1x1 255.0.0 0.0.0 oval key 0.0.0]
        dot-big: make-image 8x7 12x12 [gradient 1x1 255.0.0 0.0.0 oval key 0.0.0]
        arr: make-image 3x3 14x14 [arrow 0.0.127 rotate 90]
        ard: make-image 3x3 14x14 [arrow 0.0.127 rotate 180]    
    ]   ; end of "do" - it is needed here because easyvid approach is expecting vid dialect commands
    banner "Presentation Points"
    size 400x300 across
    style label label gold     ; make a label's text be a different color than the default
    return image dot label "This is bullet point number 1"
    return image dot label "This is bullet point number 2"
    return image arr label "This is arrow point number 1"
    return image ard label "This is an arrow making a different point"
    return image dot-big pad 0x4 area 300x80 wrap "And because these arrows and dots are images, action can be added to them to make them 'hot' with mouse actions including 'over'."
   
===Needs Some Work
!More to come.   These still need to be covered in this
tutorial:
    text-list data [icon ]
   
===Digital Clock
    origin 0
    banner "00:00:00" rate 1 effect [gradient 0x1 0.0.150 0.0.50]
        feel [engage: func [face act evt] [face/text: now/time   show face]]

===REBOL Logo
image %rebo-logo.gif [unview]
===Paint Drops
REBOL one liner by Vincent Ecuyer
b: box rate 9 effect[draw[pen(random snow)circle(random 99x99)2]blur]box 1x1 rate 9 effect[draw[(b/image: to-image b)]]

===eMailer
One line emailer by Doc Kimbel
Assumes you have set up your email in set-user
e: field "Email" s: field "Subject" m: area "Body" btn "Send"[send/subject to-email e/text m/text s/text alert "ok"]

===Hello World
text "Hello World!" button "Close" [unview]
===Three Buttons
button "Yes" button "Maybe" button "No"
===View Web Text
text 800x600 read http://www.rebol.com

===View Image
image %palms.jpg

===View Image and File Name
Here a do block is used to initialize the file variable within the layout code.
do [file: %palms.jpg]
image file   text form file


===View Image behind File Name
Here a do block is used to initialize the file variable within the layout code.
do [file: %palms.jpg]
image file form file


===Buttons From Images
    backdrop 40.70.140
    stat: text bold "Click a Button" 100x20 240.140.40 center
    button "Bay Test"   %bay.jpg 100x100 [
        stat/text: "Upper"
        show stat
    ]
    button "Blue Test" %bay.jpg 100x100 10.30.180 [
        stat/text: "Lower"
        show stat
    ]
===View List
list blue 320x200 [across text white 200 text white 100] data [
    ["John" 100]
    ["Joe" 200]
    ["Martin" 300]
]
===Movie Credits
    backdrop %bay.jpg effect [fit]
    text center bold 240x30 "REBOL, The Movie" yellow font [size: 16]
    credits: text {
Edit This File
To Add Your Own Credits

It is very simple to do.
Only takes a minute.
Only REBOL Makes It Possible...
} white bold center 240x180 rate 30 para [origin: 0x+100]
        feel [engage: func [f a e] [
            if a = 'time [f/para/origin: f/para/origin - 0x1 show f]
        ]
    ]
===Fire Demo
    box 150x150 with [
        edge: none
        img: image: make image! 150x150
        rate: 20
        text: "FIREBOLEK"
        font: make font [size: 24 color: 255.125.0]
        basic: [draw [image make pair! reduce [(random 3)   - 2 -1] img]]
        effects: reduce [
            append copy basic [blur luma -10]
            append copy basic [sharpen luma -10 blur]
            append copy basic [contrast 10 blur luma -5]        
        ]
        effect: first effects
        feel: make feel [
            engage: func [f a e][
                switch a [
                    down [f/effects: next f/effects if tail? f/effects [f/effects: head f/effects] f/effect: first f/effects show f]
                    time [show f repeat i f/size/x - 4 [poke f/image (f/size/x * f/size/y) - i - 2 (random 255.0.0 + random 0.127.0) * 3] f/img: to-image f]        
                ]      
            ]
        ]
    ]
    text 150 {classical fire demo for REBOL^/
press on fire to see other effects.^/  
Written by ReBolek, 2001 in 15 mins.^/
We need new category on Assembly:^/
less-than-kb-demo ;-)} with [font: make font   [size: 9]]
===Bezier
Oldes Bezier Line Demo
See script library for %bezier-curve.r
Uses functions and data initialized at script startup
The end points are draggable to change the curve!!!!
Here a do block is used to allow executable lines for initialization purposes.
do [
    draw-beziere-curve: has [result pp x0 x1 x2 x3 y0 y1 y2 y3 cx bx ax cy by ay t tx ty s] [
    result: make block! 120
    pp: p0/size/x / 2
    x0: p0/offset/x + pp
    y0: p0/offset/y + pp
    x1: p1/offset/x + pp
    y1: p1/offset/y + pp
    x2: p2/offset/x + pp
    y2: p2/offset/y + pp
    x3: p3/offset/x + pp
    y3: p3/offset/y + pp
    insert result compose [
        pen 155.0.0
        line (p0/offset + pp) (p1/offset + pp)
        line (p2/offset + pp) (p3/offset + pp)
        pen 255.255.255 line (p0/offset + pp)
    ]    
    cx: 3 * (x1 - x0)
    bx: 3 * (x2 - x1) - cx
    ax: x3 - x0 - cx - bx
    cy: 3 * (y1 - y0)
    by: 3 * (y2 - y1) - cy
    ay: y3 - y0 - cy - by
   
    t: s: 0.01 ;this value sets quality of the curve
   
    while [t <= 1][
        tx: to integer! (
                (ax * (t * t * t)) + (bx * (t * t)) + (cx * t) + .5
            ) + x0
        ty: to integer! (
                (ay * (t * t * t)) + (by * (t * t)) + (cy * t) + .5
            ) + y0
        t: t + s
        insert tail result to pair! reduce [tx ty]
    ]
    return result
]
click?: false
mouse-pos: 0x0
]
    origin 0
    bkg: box black 400x400 with [effect: reduce ['draw make block! 120]]
    style point box 10x10 with [
        effect: [draw [pen 0.255.0 fill-pen 0.200.0 circle 4x4 4]]
        changes: [offset]
        feel: make feel [
            engage: func [f a e][
                if a = 'down [click?: on mouse-pos: e/offset]
                if a = 'up   [click?: off]
                if find [over away] a [
                    if click? [
                        f/offset: f/offset + e/offset - mouse-pos
                        bkg/effect/2: draw-beziere-curve
                        show [bkg f]
                    ]
                ]
            ]
        ]
    ]
    at 300x200 p0: point
    at 200x100 p1: point
    at 200x300 p2: point
    at 100x200 p3: point
    do [bkg/effect/2: draw-beziere-curve]
                 
===Buttons Galore
Buttons galore from the library script %buttons.r
Here a do block is used to execute the initialization needed within the layout block.
    do [
        group: ["rotary" "test" "button"]
    ]
    origin 20x10
    backdrop effect [gradient 0x1 100.20.0]
    vh1 "52 Button Click-up - Each with a different click effect..."
    vtext bold "Here is a small sampling of the thousands of button effects you can create. (This is 78 lines of code.)"
    at 20x80 guide
    button "simple"
    button form now/date
    button "colored" 100.0.0
    button "text colored" font [colors: [255.80.80 80.200.80]]
    button with [texts: ["up text" "down text"]]
    button "bi-colored" colors [0.150.100 150.20.20]
    button with [texts: ["up color" "down color"] colors: [0.150.100 150.20.20]]
    button "image" pic
    button "color image" pic 200.100.50
    button "flip color" pic with [effects: [[fit colorize 50.50.200][fit colorize 200.50.50]]]
    button "blink" with [rate: 2 colors: [160.40.40 40.160.40]]
    return
    button "multiply" pic with [effects: [[fit][fit multiply 128.80.60]]]
    button "brighten" pic with [effects: [[fit][fit luma 80]]]
    button "contrast" pic with [effects: [[fit][fit contrast 80]]]
    button "horiz flip" pic with [effects: [[fit][fit flip 1x0]]]
    button "vert reflect" pic with [effects: [[fit][fit reflect 0x1]]]
    button "invert" pic with [effects: [[fit][fit invert]]]
    button "vert grad" with [effects: [[gradient 0x1 0.0.0 0.200.0] [gradient 0x1 0.200.0 0.0.0]]]
    button "horiz grad" with [effects: [[gradient 1x0 200.0.0 200.200.200][gradient 1x0 200.200.200 200.0.0]]]
    button "both grad" with [effects: [[gradient 1x0 140.0.0 40.40.200] [gradient 0x1 40.40.200 140.0.0]]]
    button "blink grad" with [rate: 4 effects: [[gradient 1x0 0.0.0 0.0.200] [gradient 1x0 0.0.200 0.0.0]]]
    button "blink flip" pic with [rate: 8 effects: [[fit][fit flip 0x1]]]
    return
    button "big dull button with several lines" 100x80 0.0.100
    button "dual color" pic 50.50.100 100.50.50 100x80 with [edge: [color: 80.80.80]]
    button "big edge" pic 100x80 with [edge: [size: 5x5 color: 80.80.80] effects: [[fit colorize 50.100.50][fit]]]
    button "oval reflect" pic 50.100.50 100x80 with [effect: [fit reflect 1x0 oval]]
    return
    button "text on top" pic 100x80 with [font: [valign: 'top] effects: [[fit gradcol 1x1 200.0.0 0.0.200] [fit gradcol -1x-1 200.0.0 0.0.200]]]
    button "text on bottom" pic 100x80 50.50.100 with [font: [valign: 'bottom] effects: [[fit][fit invert]]]
    button "big text font" pic 100x80 with [font: [size: 24] effects: [[fit multiply 50.100.200][fit]]]
    button "cross flip" pic 50.100.50 100x80 with [effect: [fit flip 0x1 reflect 0x1 cross]]
    return
    toggle "toggle"
    toggle "toggle red" 100.0.0
    toggle "toggle up" "toggle down"
    toggle "toggle colored" 0.150.100 150.20.20
    toggle "up color" "down color" 0.150.100 150.20.20
    toggle "toggle multiply" pic with [effects: [[fit][fit multiply 128.80.60]]]
    toggle "toggle contrast" pic with [effects: [[fit][fit contrast 80]]]
    toggle "toggle cross" pic with [effects: [[fit][fit cross]]]
    toggle "toggle v-grad" with [effects: [[gradient 0x1 0.0.0 0.200.0] [gradient 0x1 0.200.0 0.0.0]]]
    toggle "toggle h-grad" with [effects: [[gradient 1x0 200.0.0 200.200.200][gradient 1x0 200.200.200 200.0.0]]]
    toggle "toggle both" with [effects: [[gradient 1x0 140.0.0 40.40.200] [gradient 0x1 40.40.200 140.0.0]]]
    return
    rotary data group
    rotary data reduce [now/date now/time]
    rotary data group 100.0.0 0.100.0 0.0.100
    rotary data group with [font: [colors: [255.80.80 80.200.80]]]
    rotary data group with [colors: [0.150.100 150.20.20]]
    rotary data group pic
    rotary data group pic 200.100.50
    rotary data group pic with [effects: [[fit colorize 50.50.200][fit colorize 200.50.50]]]
    rotary data group with [effects: [[gradient 0x1 0.0.0 0.200.0] [gradient 0x1 0.200.0 0.0.0]]]
    rotary data group with [effects: [[gradient 1x0 200.0.0 200.200.200][gradient 1x0 200.200.200 200.0.0]]]
    rotary data group with [effects: [[gradient 1x0 140.0.0 40.40.200] [gradient 0x1 40.40.200 140.0.0]]]
===Paint Program
This section is a clip of the layout portion of Frank Sievertsen's remarkable paint program. Open this example to enable a quick link to the real source:
button "Browse Source" [browse http://www.reboltech.com/library/html/paint.html]
button "Close" [unview]
In the example below, a DO block is used to execute initialize code.
do [
    color: fill-color: start: draw-image: draw-pos: tmp: none
    type: 'box
    undos: [] redos: []
    draw: func [offset /local tmp] [
        compose [
            pen (color/color) fill-pen (fill-color/color)
            (type) (start) (either type = 'circle [
                tmp: offset - start
                to-integer square-root add tmp/x ** 2 tmp/y ** 2
            ] [offset])
        ]
    ]
]

        backdrop effect compose [gradient 1x1 (sky) (water)]
        across
        draw-image: image white 300x300 effect [draw []]
        feel [engage: func [face action event] [
            if all [type start] [
                if find [over away] action [
                    append clear draw-pos draw event/offset
                    show face
                ]
                if action = 'up [
                    append/only undos draw-pos
                    draw-pos: tail draw-pos
                    start: none
                ]
            ]
            if all [type action = 'down] [start: event/offset ]
        ]]
        do [draw-pos: draw-image/effect/draw]
        guide
        style text text [
            tmp: first back find face/parent-face/pane face
            tmp/feel/engage tmp 'down none
            tmp/feel/engage tmp 'up none
        ]
        label "Tool:" return
        radio [type: 'line] text "Line"
        return
        radio [type: 'box] on text "Box"
        return
        radio [type: 'circle] text "Circle"
        return
        style color-box box 15x15 [
            face/color: either face/color [request-color/color face/color] [request-color]
        ] ibevel
        color: color-box 0.0.0 text "Pen"
        return
        fill-color: color-box text "Fill-pen"
        return
        button "Undo" [if not empty? undos [
            append/only redos copy last undos
            draw-pos: clear last undos
            remove back tail undos
            show draw-image
        ]]
        return
        button "Redo" [if not empty? redos [
            append/only undos draw-pos
            draw-pos: insert draw-pos last redos
            remove back tail redos
            show draw-image
        ]]
===Font Lab
Carl's Font lab
Here a do block is used to initialize some values needed in the layout
do [
    change-styles: func [style start facet subfacet value /local v][
    start: find style/pane start
    foreach f start [
        f: in f facet
        if subfacet <> 'none [f: in get f subfacet]
        either block? value [
            if not block? get f [set f either none? get f [copy []][reduce [get f]]]
            either v: find get f value [remove v][head insert get f value]
        ][set f value]
    ]
    show style
]
chg: func ['facet 'subfacet value] [change-styles external-view norm-start facet subfacet value ]
shad: does [chg font shadow sdir * to-integer sl2/data * 16]
sdir: 1x1
sz: 180x40
sx2: sz/x / 2
]
    style tgl toggle 60
    style lab vtext bold
    backcolor rebolor
    space 0x5
    across
    p: choice 180 "Sans-Serif Style" "Serif Style" "Fixed Width Style"
        [chg font name pick reduce [font-sans-serif font-serif font-fixed] index? p/data]
        return
    tgl "Bold" [chg font style [bold]]
    tgl "Italic" italic [chg font style [italic]]
    tgl "Lined" underline [chg font style [underline]]
    return
    tgl "Left" of 'tg1 [chg font align 'left]
    tgl "Center" of 'tg1 [chg font align 'center]
    tgl "Right" of 'tg1 [chg font align 'right]
    return
    tgl "Top" of 'tg2 [chg font valign 'top]
    tgl "Middle" of 'tg2 [chg font valign 'middle]
    tgl "Bottom" of 'tg2 [chg font valign 'bottom]
    return
    lab "Size:" 60x20 font []
    sl: slider 120x20 [chg font size max 8 to-integer sl/data * 40]
    with [append init [data: .5]]
   
    return
    lab "Space:" 60x20 font []
    sl1: slider 120x20 [chg font space (1x0 * to-integer sl1/data * 20) - 5x0]
    return
    lab "Shadow:" 60x20 font []
    sl2: slider 120x20 [shad]   with [append init [data: .5]]
    return
    lab "Shad Dir:" 60x20
    arrow left   [sdir: sdir * 0x1 + -1x0 shad] pad 6
    arrow right [sdir: sdir * 0x1 + 1x0 shad]   pad 6
    arrow up     [sdir: sdir * 1x0 + 0x-1 shad] pad 6
    arrow down   [sdir: sdir * 1x0 + 0x1 shad]   pad 6
    return
    button sx2 "Text Color" [chg font color request-color]
    button sx2 "Area Color" [chg color none request-color]
    return
    button sx2 "Help" [alert "Click the controls on the left to change text on the right."]
    button sx2 "Close" #"^Q" [unview]
    below
    at p/offset + (p/size * 1x0) + 10x0
    norm-start:
    Title "Title" sz
    h1 "Heading 1" sz
    h2 "Heading 2" sz
    h3 "Heading 3" sz
    h4 "Heading 4" sz
    h5 "Heading 5" sz
    at norm-start/offset + (norm-start/size * 1x0) + 10x0
    banner "Banner" sz
    vh1 "Video Heading 1" sz
    vh2 "Video Heading 2" sz
    vh3 "Video Heading 3" sz
    vtext "Video Text" sz
    text "Document Text" sz
   
===Windows Clipboard
---Cut or Copy to Clipboard
Normal Windows cut and copy commands are supported e.g. on a field, contents can be copied to the clipboard. Programmatic access is also supported for text contents.
    across
    label "Entry field: "
    return input-field: field 200 "Enter your text here"
    return button 200 "Copy Entry field data to clipboard" [write clipboard:// input-field/text]
    return button 200 "Show Clipboard Contents" [alert read clipboard://]
---Clearing The Clipboard
    across
    button 200 "Clear The Clipboard" [write clipboard:// ""]
    return button 200 "Show Clipboard Contents" [alert read clipboard://]
---Paste from Clipboard
Normal Windows paste commands are supported e.g. on a field, contents can be pasted. Programmatic access is also supported for text contents.
    across
    button 200 "Show Clipboard Contents" [alert read clipboard://]
===Requesters
REBOL View supports an assortment of requesters.
The results of the request-* code are returned as its value e.g. chosen-date: request-date
---Request Yes | No | Cancel
Provides the user the capability to pick from choices "Yes" | "No" | "Cancel"
The result is "True" | "False" | none
    do [user-response: none]
    button "Simple Request" 200 [user-response: request "Do you want to abandon your input so far?"]
    button "View User Response" 200 [alert form user-response]
   
---Pick A Color
    do [chosen-color: gold]
    button "Pick Color" 200 [chosen-color: request-color]
    button "View Chosen Color" 200 [alert form chosen-color]
---Pick An Answer
The request allows a descriptive value then 1, 2, or 3 options.
    button "Format" 100 [request ["Your message goes here. It will wrap if it is very very long." "Choice 1" "Choice 2" "Choice 3"]]
   
    button "Example 1" 100 [request ["Pick The Color of Your New Model T" "Black"]]
   
    button "Example 2" 100 [request ["Pick one country" "England" "France"]]
    button "Example 3" 100 [request ["Run Extract Script?" "Yes" "No" "Cancel"]]
---Pick A Date
    do [chosen-date: 01-Jun-1990]
    button "Pick Date" 200 [chosen-date: request-date]
    button "See Chosen Date" 200 [alert form chosen-date]
---Get A LogonID and Password
    do [credentials: none]
    button "Get Credentials" 200 [credentials: request-pass]
    button "View Credentials" 200 [
        view/new layout [
            size 200x200 backtile polished orange
            across banner "Credentials"
            return label "LogonID:   " txt pick credentials 1
            return label "Password: " txt pick credentials 2
        ]
    ]
---Pick A File
Format: REQUEST-FILE /title title-line button-text /file name /filter filt /keep    
        do [filter-block: ["*.gif" "*.jpg" "*.png" "*.bmp"]]
        button "Pick Any File" 300 [request-file "Select"]      
        button "Pick With A Title" 300 [request-file/title "Pick The Data File to Process" "OK"]
        button "Change the Action Button Name" 300 [request-file/title "Pick The Data File to Process" "OK"]        
        button "Keep Results" 300 [request-file/title/keep "Previous Select On This Button Is Kept" "OK"]
        button "Filter Files" 300 [request-file/title/filter "Pick An Image File" "OK" filter-block]    
---Request Text Input
Format: REQUEST-TEXT /offset xy /title title-text /default str
   
    button "Request Text Input - all default parameters" 300 [request-text]
    button "Request Text Input - with offset to window" 300 [request-text/offset 40x40]
    button "Request Text Input - with title" 300 [request-text/title "Input your question"]
    button "Request Text Input - with default" 300 [request-text/default "Key your question here"]
    button "Request Text Input - with all parameters" 300 [request-text/offset/title/default 100x100 "Input your question" "Key your question here"]
---Request Download from Net
Request a file download from the net. Show progress. Return none on error.
Format: REQUEST-DOWNLOAD url /to local-file
    backtile polished orange    
    button "Request File Download To local REBOL Cache" 300 [request-download http://www.rebol.com/index.html]
    button "Request File Download To This Directory" 300 [request-download/to http://www.rebol.com/index.html none]
    button "Request File Download To Specific File" 300 [request-download/to http://www.rebol.com/index.html %/c/temp.html]
===Message Box
    button "Format" 100 [request ["Your message goes here. It will wrap if it is very very long and tedious." "Close"]]
    button "Example" 100 [request ["You done good!" "OK"]]
---Confirmation
    button "Exit" 100 [
        request/confirm "Do you want to quit without saving?" []
    ]
   
===Calling the Editor
The REBOL editor is now callable with the editor function
    backtile polished
    button 300 "Create a test file and edit it" [
        write %temp.txt "This is a test file"
        editor %temp.txt
    ] frame 204.0.0
   
===Calling Windows
With View/Pro the calling of executables is supported.
Here are two simple examples that will work if you have View/Pro on a platform where a notepad and calc are avaiable.
    across backtile size 200x200
    return button "Notepad" [call ["notepad.exe"]]
    return button "Calculator" [call ["calc.exe"]]
===Window Options
Note that these are options which are ignored by the easyvid.r code that displays them in this tutorial.
Copy the code out and run it standalone in REBOL/View.
---Block Options: No Border and No Title
    view/options layout [
        size 200x200
        banner "Window Options"
        button "Close" [unview]
        ] [
            no-border
            no-title
        ]
---Word Option: No Title
Note that the results of this are surprising if you run it from within a script that has a title option. It is displayed near location 0x0 of the resulting window instead of in the window frame that has been suppressed.
    view/options layout [
        size 200x200
        banner "Window Options"
        button "Close" [unview]
        ] 'no-title
===REBOL/View Notifiers
REBOL/View supports simple notifiers to send messages to a user interface
---Alert
    button 220 polished "Send alert message" [alert "This causes a dialogue box to popup" ]
---Flash
Flash is provided to provide a message and keep on processing.
    across size 200x200
    return button 150 "Create Flash Message" [flash "Testing"]
    return button 150 "Unview Flash" [unview]
---Inform
    inform layout   [
        backtile polished sky
        across text font-size 16 bold underline red "Action complete!"
        return button "OK"   [unview]]
---Popup
REBOL supports popups   (see note below before running!)
        across size 200x200
        button "Show Popup" [
            show-popup popup-layout: layout [
                    across size 200x200
                    backtile polished
                    banner "The Popup Worked"
                    return button "Unview" [unview]
                ]
        ]
        return button "Hide Popup" [unview/only popup-layout]
I have had some difficulties (process lockup) when using
these popups so just use view layout [...] and skip the popup part.
===Diagram Example
Carl has created some diagrams in REBOL using styles to make an architecture diagram.
This is a slightly modified version.
Here again a DO block precedes the layout code for non-layout initiatiation ... here the definition of a function.
Why make a diagram this way?
1. One reason is that it can be interactive ... the sections are all "hot" with a few lines of code.   Here they pop up REBOL Dialogs but they could do anything that can be coded even something as simple as launching a browser on a different URL for each diagram component.   The "Compositor" box demonstrates this by launching your browser on the REBOL.com site.
2. Very small footprint size compared to other presentation source formats.
do [
        information: func [info [string!]][
        request/ok reform [ info]
    ]
]
    style bx box 255.255.255 0.0.0 font-size 11 font [color: 0.0.0 shadow: 0x0] edge [size: 5x2]
        [request/ok reform ["No information on" face/text]]
    style bb box bold left top para [origin: 6x10] edge [size: 2x2]
        [request/ok reform ["No information on" face/text]]
    backcolor silver + 30
    at 15x15 h1 486 left "Arch Structure"
    at 15x50     bb "Client" 506x436 160.80.80 [
        information "Any client machine e.g. branch or Call Centre"]
    at 25x252   bb "Mid-Tier" 486x68 effect [gradient 1x1 169.91.155 80.45.75]
    at 25x152   bb "UI" 486x96     effect [gradient 1x1 38.156.82 19.78.41]
    at 25x324   bb "Servers" 486x151   effect [gradient 1x1 103.96.200 50.45.100] [information "Mid-tiers servers with XYZ relational database server" ]
    at 130x216   bx "Compositor" 182x24 bold [browse http://www.rebol.com]
    at 130x60   bx "Browser" 120x24 [information "Branch standard browser"]
    at 130x188   bx "Sound" 182x24 bold [information "Sound services"]
    at 255x60   bx "Win32" 120x24 [information "Win32 App"]
===Column Images
Creates a layout looking (a little) like columns. It uses a gradient effect going from darker to lighter
do [
    column: make image! layout [
            backdrop effect [gradient 1x0 20.20.20 250.240.230 luma 60]
        ]
    column-size: 50x420
    area-size: 400x420   ; height should be the same as column-size
]
backtile polished tan
  across
  image column-size   column
  pad -10x0         ; this brings the default VID spacing back
  area wrap area-size  
  edge none         ; take the edge off of area so that it more closely blends
  shadow 2x2
  pad -10x0 image column-size column   ; if you want a right column
===Tree View of Directory
This is Didier's tree view %request-dir.r
In this sample, you must be online because the code is accessed on the Rebol script server
do [do http://www.rebol.org/library/scripts/request-dir.r
    request-dir
]
Note that:
* the script is read from the script library but runs locally
* it is showing the files in your directories
===The emailer Function
The function for emailing has appeared in Jan-2004 on the rebol list.
It is a simple idea ... to create a standard emailer by invoking a function emailer. This window will show the source:
  text wrap 400x300 mold get 'emailer
And it is simple to run:
    across size 200x200
    return button 150 "Run emailer" [emailer]
But on my machine there is again a problem - the emailer locks up REBOL/View.
Recommendation:
* if it works use it if you like
* use Doc Kimbel's one liner (works for me). Assumes you have set up your email in set-user
e: field "Email" s: field "Subject" m: area "Body" btn "Send"[send/subject to-email e/text m/text s/text alert "ok"]
* better yet, make your own... if the code for the basic is 1 line, then a custom version is not far away. Here's an example that allows selection of your frequent contacts (entered in the names-addresses series) and keeps a journal of email that you have sent (using this code) in file email-journal.txt.   Assumes you have setup your user profile correctly to allow sending of email.
do [
  names-addresses: [
    "Contact 1"         contact1@no-such-address.com
    "Contact 2"         contact2@no-such-address.com
    "Contact 3"         contact3@no-such-address.com
  ]
  names: copy []
  foreach [name address] names-addresses [append names name]
  journal?: false   ; set to true if want to journalize sent email
]
    e: rotary 200 data sort names
    s: field "Subject"
    m: area 500x400 wrap "Body"
    btn "Send"[
        send/subject who-to: select names-addresses e/text m/text s/text
        alert join "Sent email to: " form who-to
       
        if journal? [
            write/append %email-journal.txt rejoin [
                "[ When-sent: " now/precise
                " To: " who-to
                " Subject: {" s/text
                "} Message: {" m/text "} ] "
                newline
            ]
        ]
    ]
    btn "Quit" [unview]
It won't take much to change this from the rotary used to a text list allowing multiple selections.
===Some More email
Earlier there have been a few examples of sending email. Here are a few more that often appear in the mailing list
---Simple Send
This is not a runnable version because you don't need anything but REBOL/Core to run it. It has been wrapped in a DO block so it does not send errors to the console.
---Quick Send Short Message
do [send address@isp.com "My Message" ]

---Send Longer Message  
Now a more complex message where there is a body to the message:
do [
    send address@isp.com {Sample Message
             
    This is the body of the message
    }
]
---Send with One Attachment
Here, so that the sample does not fail, test file(s) are created by the code before attempting the send.
do [
    test-file: %file-attachment.txt
    write test-file {Just some test data to create a file}
    send/attach address@isp.com {Sample Message
             
    This is the body of the message
    } test-file
]

---Send with Attachments
And a message with multiple attachments.
Here, so that the sample does not fail, test file(s) are created by the code before attempting the send.
do [
    files: [%file-attachment.txt %second-attachment.txt]
    foreach file files [write file {Just some test data to create a file}]
    send/attach address@isp.com {Sample Message
             
    This is the body of the message
    } files
]

---Send to Multiple Addresses
Here, so that the sample does not fail, test file(s) are created by the code before attempting the send.
do [
    files: [%file-attachment.txt %second-attachment.txt]
    foreach file files [write file {Just some test data to create a file}]
    send/attach [address@isp.com asecondAddress@isp.com] {Sample Message
             
    This is the body of the message
    } files
]

---Send/only
Same send only just provide the SMTP server with one copy:
Here, so that the sample does not fail, test file(s) are created by the code before attempting the send.
  do [
    files: [%file-attachment.txt %second-attachment.txt]
    foreach file files [write file {Just some test data to create a file}]
    send/only/attach [address@isp.com asecondAddress@isp.com] {Sample Message
             
    This is the body of the message
    } files
]

---Send With Header
This example uses a Do block to wrap the code. If you execute the email should be sent.
But it is unlikely to be delivered.
The addresses for me and you should be changed in your use as well as the
* Subject
* Organization
* Content
do [
  me: myaddress@isp.com
  you: youraddress@isp.com
  header-object: make system/standard/email [
            From: me
            Reply-To: me
            Subject: "Some Stuff"
            Organization: "Cyberia"
            MIME-Version: 1.0
            Content-Type: "text/plain"
    ]
send/header you {Test Message
    This is the message body.
    }                
    header-object
]
---Send with CC
This adds a copy value in the header-object
do [
  me: myaddress@isp.com
  you: youraddress@isp.com
  header-object: make system/standard/email [
            From: me
            Reply-To: me
            Subject: "Some Stuff"
            Organization: "Cyberia"
            MIME-Version: 1.0
            Content-Type: "text/plain"
        cc: another-address@isp.com
    ]
send/header you {Test Message
    This is the message body.
    }                
    header-object
]
 
---Doctored Code
Again Doc Kimbel's one liner that does not waste a character
e: field "Email" s: field "Subject" m: area "Body" btn "Send"[send/subject to-email e/text m/text s/text alert "ok"]
===Sharp Styles
I really like the style that Didier has put around his email previewer
do [
   
    ss-light: stylize [
        text: text feel none
        vtext: vtext feel none
        col-hdg: text black 255.255.204 bold middle effect []
        col-txt: text edge [size: 1x0 color: gray effect: 'bevel]
        ban: vh3 left to-pair reduce [
            50 logo.gif/size/y] edge [
                color: 0.0.0 size: 0x1] feel none with [color: black]
        lab: label para [origin: 2x3 margin: 0x2]
        labe: lab edge [size: 1x1 color: water effect: 'ibevel]
        inf: info 100 font-color yellow
        bkg: backdrop water - 10.10.10
        txt-big: vtext 300 font-size 18 font-color yellow center
        rti: vtext font-size 14 bold
        txt-ch: rti font-color white 170x22 para [
            origin: 2x3] with [font: make font [
                    color: white] colors: [55.95.155 235.170.55]]
        btnb: btn 70.70.70 font-color white
        men: rti 264 edge [size: 1x1 color: water effect: 'bevel] para [origin: 20x2 margin: 1x4]
            with [color: water - 40.40.40 effect: first effects: [
                [draw [pen white fill-pen white polygon 5x2 13x10 5x18]] [draw [pen white fill-pen white polygon 2x5 10x13 18x5]]
            ] feel: none]   ;system/view/vid/vid-feel/hot]
        cbox: box 60x20 edge [size: 1x1 color: water effect: 'bevel] [
            if temp: request-color/color first face/data [face/color: temp change face/data temp show face]
        ] with [append init [color: first data]]
    ]
    stylesheet: ss-heavy: stylize/styles [
        col-hdg: col-hdg effect [gradcol 0x1 200.200.160 155.155.104]
        ban: ban effect [merge gradcol 150.180.200 0.0.0] with [color: none]
        bkg: backdrop effect [gradient 1x1 65.125.175 45.75.115 grid 2000x4 1999x4 70.130.190 blur]
        txt-big: vtext 300 font-size 18 font-color yellow center
        rti: vtext font-size 14 bold
        txt-ch: txt-ch effect [gradcol -1x1 105.105.105 151.151.151]
        men: men effect [gradcol -1x0 black water]
    ] ss-light
   
]

    styles stylesheet
    space 4x4 origin 4x4 across
           
    bkg
    pad 15 ban 235 :title para [origin: 32x0]
    pad -254
    image 30x30 %palms.jpg effect [fit key 255.0.255]
   
   
   
}

code: text: layo: external-view: none
sections: []
layouts: []
space: charset " ^-"
chars: complement charset " ^-^/"
rules: [title some parts]
title: [text-line (title-line: text)]
parts: [
      newline
    | "===" section
    | "---" subsect
    | "!" note
    | example
    | paragraph
]
text-line: [copy text to newline newline]
indented:   [some space thru newline]
paragraph: [copy para some [chars thru newline] (emit txt para)]
note: [copy para some [chars thru newline] (emit-note para)]
example: [
    copy code some [indented | some newline indented]
    (emit-code code)
]
section: [
    text-line (
        append sections text
        append/only layouts layo: copy page-template
        emit h1 text
    ) newline
]
subsect: [text-line (emit h2 text)]
emit: func ['style data] [repend layo [style data]]
emit-code: func [code] [
    remove back tail code
    repend layo ['code 460x-1 trim/auto code 'show-example]
]
emit-note: func [code] [
    remove back tail code
    repend layo ['tnt 460x-1 code]
]
show-example: [
    if external-view [xy: external-view/offset   unview/only external-view]
    xcode: load/all face/text
    if not block? xcode [xcode: reduce [xcode]] ;!!! fix load/all
    if here: select xcode 'layout [xcode: here]
    external-view: view/new/offset layout xcode xy
]
page-template: [
    size 500x480 origin 8x8
    backdrop white - 80
    style code tt snow navy bold as-is para [origin: margin: 12x8]
    style tnt txt maroon bold
]
parse/all detab content rules
show-page: func [i /local blk last-face][
    i: max 1 min length? sections i
    append clear tl/picked pick sections i
    if blk: pick layouts this-page: i [
        f-box/pane: layout/offset blk 0x0
        last-face: last f-box/pane/pane     ; bh slider
    f-box/pane/pane/1/size: f-box/pane/size: max 500x480 add 20x20 add last-face/offset last-face/size ; bh slider
    update-slider ; bh slider
        show f-box
    ]
    show tl     ; changed to after slider update ; was not refreshing the index display
]
update-slider: does [
    sld/data: 0
    either object? f-box/pane [
        sld/redrag min 1.0 divide sld/size/2 f-box/pane/size/2
        sld/action: func[face event] compose [
            f-box/pane/offset/2: multiply face/data (subtract 480 f-box/pane/size/2)
            show f-box
        ]
    ][
        sld/redrag 1.0 show sld
        sld/action: none
    ]
    show sld
]
main: layout [
    backtile polished
    across
    vh2 title-line return
    tl: text-list 160x480 bold black white data sections [
        show-page index? find sections value
    ]
    h: at
    f-box: box 500x480
  at h + 500x0 sld: slider 24x480                 ; add brett's slider
    at h + 456x-24
    across space 4
    arrow left   keycode [up left] [show-page this-page - 1]
    arrow right keycode [down right] [show-page this-page + 1]
    pad -150
    txt white italic font-size 16 form system/script/header/date/date
]
show-page 1
xy: main/offset + either system/view/screen-face/size/x > 900 [
    main/size * 1x0 + 8x0][300x300]
view main

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