amber/st/Canvas.st

Smalltalk current createPackage: 'Canvas'!
Object subclass: #HTMLCanvas
	instanceVariableNames: 'root'
	package: 'Canvas'!
!HTMLCanvas commentStamp!
I am a canvas for building HTML.

I provide the `#tag:` method to create a `TagBrush` (wrapping a DOM element) and convenience methods in the `tags` protocol.

## API

My instances are used as the argument of the `#renderOn:` method of `Widget` objects.

The `#with:` method is used to compose HTML, nesting tags. `#with:` can take a `TagBrush`, a `String`, a `BlockClosure` or a `Widget` as argument.

## Usage example:

    aCanvas a 
        with: [ aCanvas span with: 'click me' ];
        onClick: [ window alert: 'clicked!!' ]!

!HTMLCanvas methodsFor: 'accessing'!

root
	^root
!

root: aTagBrush
	root := aTagBrush
!

snippet: anElement
	"Adds clone of anElement, finds [data-snippet=""*""] subelement
	and returns TagBrush as if that subelement was just added.
	
	Rarely needed to use directly, use `html foo` dynamically installed method
	for a snippet named foo."
	
	| clone caret |
	
	clone := anElement asJQuery clone.
	self with: (TagBrush fromJQuery: clone canvas: self).
	caret := clone find: '[data-snippet="*"]'.
	caret toArray isEmpty ifTrue: [ caret := clone ].
	^TagBrush fromJQuery: (caret removeAttr: 'data-snippet') canvas: self
! !

!HTMLCanvas methodsFor: 'adding'!

entity: aString
	"Adds a character representing html entity, eg.
	html entity: 'copy'
	adds a copyright sign.
	If a name does not represent valid HTML entity, error is raised."
	| result |
	result := ('<span />' asJQuery html: '&', aString, ';') text.
	result size = 1 ifFalse: [ self error: 'Not an HTML entity: ', aString ].
	self with: result
!

with: anObject
	^self root with: anObject
! !

!HTMLCanvas methodsFor: 'initialization'!

initialize
	super initialize.
	root ifNil: [root := TagBrush fromString: 'div' canvas: self]
!

initializeFromJQuery: aJQuery
	root := TagBrush fromJQuery: aJQuery canvas: self
! !

!HTMLCanvas methodsFor: 'tags'!

a
	^self tag: 'a'
!

abbr
	^self tag: 'abbr'
!

address
	^self tag: 'address'
!

area
	^self tag: 'area'
!

article
	^self tag: 'article'
!

aside
	^self tag: 'aside'
!

audio
	^self tag: 'audio'
!

base
	^self tag: 'base'
!

blockquote
	^self tag: 'blockquote'
!

body
	^self tag: 'body'
!

br
	^self tag: 'br'
!

button
	^self tag: 'button'
!

canvas
	^self tag: 'canvas'
!

caption
	^self tag: 'caption'
!

cite
	^self tag: 'cite'
!

code
	^self tag: 'code'
!

col
	^self tag: 'col'
!

colgroup
	^self tag: 'colgroup'
!

command
	^self tag: 'command'
!

datalist
	^self tag: 'datalist'
!

dd
	^self tag: 'dd'
!

del
	^self tag: 'del'
!

details
	^self tag: 'details'
!

div
	^self tag: 'div'
!

div: aBlock
	^self div with: aBlock
!

dl
	^self tag: 'dl'
!

dt
	^self tag: 'dt'
!

em
	^self tag: 'em'
!

embed
	^self tag: 'embed'
!

fieldset
	^self tag: 'fieldset'
!

figcaption
	^self tag: 'figcaption'
!

figure
	^self tag: 'figure'
!

footer
	^self tag: 'footer'
!

form
	^self tag: 'form'
!

h1
	^self tag: 'h1'
!

h1: anObject
	^self h1 with: anObject
!

h2
	^self tag: 'h2'
!

h2: anObject
	^ self h2 with: anObject
!

h3
	^self tag: 'h3'
!

h3: anObject
	^self h3 with: anObject
!

h4
	^self tag: 'h4'
!

h4: anObject
	^self h4 with: anObject
!

h5
	^self tag: 'h5'
!

h5: anObject
	^self h5 with: anObject
!

h6
	^self tag: 'h6'
!

h6: anObject
	^self h6 with: anObject
!

head
	^self tag: 'head'
!

header
	^self tag: 'header'
!

hgroup
	^self tag: 'hgroup'
!

hr
	^self tag: 'hr'
!

html
	^self tag: 'html'
!

iframe
	^self tag: 'iframe'
!

iframe: aString
	^self iframe src: aString
!

img
	^self tag: 'img'
!

img: aString
	^self img src: aString
!

input
	^self tag: 'input'
!

label
	^self tag: 'label'
!

legend
	^self tag: 'legend'
!

li
	^self tag: 'li'
!

li: anObject
	^self li with: anObject
!

link
	^self tag: 'link'
!

map
	^self tag: 'map'
!

mark
	^self tag: 'mark'
!

menu
	^self tag: 'menu'
!

meta
	^self tag: 'meta'
!

nav
	^self tag: 'nav'
!

newTag: aString
	^TagBrush fromString: aString canvas: self
!

noscript
	^self tag: 'noscript'
!

object
	^self tag: 'object'
!

ol
	^self tag: 'ol'
!

ol: anObject
	^self ol with: anObject
!

optgroup
	^self tag: 'optgroup'
!

option
	^self tag: 'option'
!

output
	^self tag: 'output'
!

p
	^self tag: 'p'
!

p: anObject
	^self p with: anObject
!

param
	^self tag: 'param'
!

pre
	^self tag: 'pre'
!

progress
	^self tag: 'progress'
!

script
	^self tag: 'script'
!

section
	^self tag: 'section'
!

select
	^self tag: 'select'
!

small
	^self tag: 'small'
!

source
	^self tag: 'source'
!

span
	^self tag: 'span'
!

span: anObject
	^self span with: anObject
!

strong
	^self tag: 'strong'
!

strong: anObject
	^self strong with: anObject
!

style
	^ root addBrush: (StyleTag canvas: self)
!

style: aString
	^ self style with: aString; yourself
!

sub
	^self tag: 'sub'
!

summary
	^self tag: 'summary'
!

sup
	^self tag: 'sup'
!

table
	^self tag: 'table'
!

tag: aString
	^root addBrush: (self newTag: aString)
!

tbody
	^self tag: 'tbody'
!

td
	^self tag: 'td'
!

textarea
	^self tag: 'textarea'
!

tfoot
	^self tag: 'tfoot'
!

th
	^self tag: 'th'
!

thead
	^self tag: 'thead'
!

time
	^self tag: 'time'
!

title
	^self tag: 'title'
!

tr
	^self tag: 'tr'
!

ul
	^self tag: 'ul'
!

ul: anObject
	^self ul with: anObject
!

video
	^self tag: 'video'
! !

!HTMLCanvas class methodsFor: 'instance creation'!

browserVersion
	^(jQuery at: #browser) version
!

isMSIE
	^((jQuery at: #browser) at: #msie) notNil
!

isMozilla
	^((jQuery at: #browser) at: #mozilla) notNil
!

isOpera
	^((jQuery at: #browser) at: #opera) notNil
!

isWebkit
	^((jQuery at: #browser) at: #webkit) notNil
!

onJQuery: aJQuery
	^self basicNew
		initializeFromJQuery: aJQuery;
		initialize;
		yourself
! !

Object subclass: #HTMLSnippet
	instanceVariableNames: 'snippets'
	package: 'Canvas'!
!HTMLSnippet commentStamp!
My sole instance is the registry of html snippets.
`HTMLSnippet current` is the public singleton instance.

On startup, it scans the document for any html elements
with `'data-snippet="foo"'` attribute and takes them off the document,
remembering them in the store under the specified name.
It also install method #foo into HTMLCanvas dynamically.

Every html snippet should mark a 'caret', a place where contents
can be inserted, by 'data-snippet="*"' (a special name for caret).
For example:

`<li data-snippet='menuelement' class='...'><a data-snippet='*'></a></li>`

defines a list element with a link inside; the link itself is marked as a caret.

You can later issue

`html menuelement href: '/foo'; with: 'A foo'`

to insert the whole snippet and directly manipulate the caret, so it renders:

`<li class='...'><a href='/foo'>A foo</a></li>`

For a self-careting tags (not very useful, but you do not need to fill class etc.
you can use

`<div class='lots of classes' attr1='one' attr2='two' data-snippet='*bar'></div>`

and in code later do:

`html bar with: [ xxx ]`

to render

`<div class='lots of classes' attr1='one' attr2='two'>...added by xxx...</div>`!

!HTMLSnippet methodsFor: 'accessing'!

snippetAt: aString
	^ self snippets at: aString
!

snippets
	^snippets ifNil: [ snippets := #{} ]
! !

!HTMLSnippet methodsFor: 'initialization'!

initializeFromJQuery: aJQuery
	"Finds and takes out all snippets out of aJQuery.
	Installs it into self."
	
	(self snippetsFromJQuery: aJQuery) do: [ :each |
		self installSnippetFromJQuery: each asJQuery ]
! !

!HTMLSnippet methodsFor: 'method generation'!

snippetAt: aString compile: anElement
	"Method generation for the snippet.
	The selector is aString, the method block uses anElement"
	
	ClassBuilder new
		installMethod: ([ :htmlReceiver | htmlReceiver snippet: anElement ]
			currySelf asCompiledMethod: aString)
		forClass: HTMLCanvas
		category: '**snippets'
! !

!HTMLSnippet methodsFor: 'private'!

snippetsFromJQuery: aJQuery
	^ (aJQuery find: '[data-snippet]') toArray
! !

!HTMLSnippet methodsFor: 'snippet installation'!

installSnippetFromJQuery: element
	| name |
	name := element attr: 'data-snippet'.
	name = '*' ifFalse: [
		('^\*' asRegexp test: name)
			ifTrue: [
				name := name allButFirst.
				element attr: 'data-snippet' put: '*' ]
			ifFalse: [
				element removeAttr: 'data-snippet' ].
		self snippetAt: name install: (element detach get: 0) ]
!

snippetAt: aString install: anElement
	self snippets at: aString put: anElement.
	self snippetAt: aString compile: anElement
! !

HTMLSnippet class instanceVariableNames: 'current'!

!HTMLSnippet class methodsFor: 'initialization'!

ensureCurrent
	current ifNil: [
		current := super new
			initializeFromJQuery: document asJQuery;
			yourself ]
!

initialize
	super initialize.
	self isDOMAvailable ifTrue: [
		self ensureCurrent ]
! !

!HTMLSnippet class methodsFor: 'instance creation'!

current
	^ current
!

isDOMAvailable
	< return typeof document !!== 'undefined' >
!

new
	self shouldNotImplement
! !

Object subclass: #TagBrush
	instanceVariableNames: 'canvas element'
	package: 'Canvas'!
!TagBrush commentStamp!
I am a brush for building a single DOM element (which I hold onto).

All tags but `<style>` are instances of me (see the `StyleBrush` class).

## API

1. Nesting

    Use `#with:` to nest tags. `#with:` can take aString, `TagBrush` instance, a `Widget` or block closure as parameter.

    Example: `aTag with: aString with: aCanvas div`

2. Events

    The `events` protocol contains all methods related to events (delegating event handling to jQuery).

    Example: `aTag onClick: [ window alert: 'clicked' ]`

3. Attributes

    The `attribute` protocol contains methods for attribute manipulation (delegating to jQuery too).

    Example: `aTag at: 'value' put: 'hello world'`

4. Raw access and jQuery

    The `#element` method can be used to access to JavaScript DOM element object.

    Example: `aTag element cssStyle`

    Use `#asJQuery` to access to the receiver converted into a jQuery object.

    Example: `aTag asJQuery css: 'color' value: 'red'`!

!TagBrush methodsFor: 'accessing'!

element
	^element
! !

!TagBrush methodsFor: 'adding'!

addBrush: aTagBrush
	self appendChild: aTagBrush element.
	^aTagBrush
!

append: anObject
	anObject appendToBrush: self
!

appendBlock: aBlock
	| root |
	root := canvas root.
	canvas root: self.
	aBlock value: canvas.
	canvas root: root
!

appendChild: anElement
	"In IE7 and IE8 appendChild fails on several node types. So we need to check"
	<var element=self['@element'];
	if (null == element.canHaveChildren || element.canHaveChildren) {
		element.appendChild(anElement);
	} else {
		element.text = String(element.text) + anElement.innerHTML;
	} >
!

appendString: aString
	self appendChild: (self createTextNodeFor: aString)
!

appendToBrush: aTagBrush
	aTagBrush addBrush: self
!

contents: anObject
	self
	empty;
	append: anObject
!

empty
	self asJQuery empty
!

with: anObject
	self append: anObject
! !

!TagBrush methodsFor: 'attributes'!

accesskey: aString
	self at: 'accesskey' put: aString
!

action: aString
	self at: 'action' put: aString
!

align: aString
	self at: 'align' put: aString
!

alt: aString
	self at: 'alt' put: aString
!

at: aString put: aValue
	<self['@element'].setAttribute(aString, aValue)>
!

class: aString
	<self['@element'].className = aString>
!

cols: aString
	self at: 'cols' put: aString
!

contenteditable: aString
	self at: 'contenteditable' put: aString
!

contextmenu: aString
	self at: 'contextmenu' put: aString
!

draggable: aString
	self at: 'draggable' put: aString
!

for: aString
	self at: 'for' put: aString
!

height: aString
	self at: 'height' put: aString
!

hidden
	self at: 'hidden' put: 'hidden'
!

href: aString
	self at: 'href' put: aString
!

id: aString
	self at: 'id' put: aString
!

media: aString
	self at: 'media' put: aString
!

method: aString
	self at: 'method' put: aString
!

name: aString
	self at: 'name' put: aString
!

placeholder: aString
	self at: 'placeholder' put: aString
!

rel: aString
	self at: 'rel' put: aString
!

removeAt: aString
	<self['@element'].removeAttribute(aString)>
!

rows: aString
	self at: 'rows' put: aString
!

src: aString
	self at: 'src' put: aString
!

style: aString
	self at: 'style' put: aString
!

tabindex: aNumber
	self at: 'tabindex' put: aNumber
!

target: aString
	self at: 'target' put: aString
!

title: aString
	self at: 'title' put: aString
!

type: aString
	self at: 'type' put: aString
!

valign: aString
	self at: 'valign' put: aString
!

value: aString
	self at: 'value' put: aString
!

width: aString
	self at: 'width' put: aString
! !

!TagBrush methodsFor: 'converting'!

asJQuery
	^window jQuery: self element
! !

!TagBrush methodsFor: 'events'!

onBlur: aBlock
	self asJQuery bind: 'blur' do: aBlock
!

onChange: aBlock
	self asJQuery bind: 'change' do: aBlock
!

onClick: aBlock
	self asJQuery bind: 'click' do: aBlock
!

onDblClick: aBlock
	self asJQuery bind: 'dblclick' do: aBlock
!

onFocus: aBlock
	self asJQuery bind: 'focus' do: aBlock
!

onFocusIn: aBlock
	self asJQuery bind: 'focusin' do: aBlock
!

onFocusOut: aBlock
	self asJQuery bind: 'focusout' do: aBlock
!

onHover: aBlock
	self asJQuery bind: 'hover' do: aBlock
!

onKeyDown: aBlock
	self asJQuery bind: 'keydown' do: aBlock
!

onKeyPress: aBlock
	self asJQuery bind: 'keypress' do: aBlock
!

onKeyUp: aBlock
	self asJQuery bind: 'keyup' do: aBlock
!

onMouseDown: aBlock
	self asJQuery bind: 'mousedown' do: aBlock
!

onMouseEnter: aBlock
	self asJQuery bind: 'mouseenter' do: aBlock
!

onMouseLeave: aBlock
	self asJQuery bind: 'mouseleave' do: aBlock
!

onMouseMove: aBlock
	self asJQuery bind: 'mousemove' do: aBlock
!

onMouseOut: aBlock
	self asJQuery bind: 'mouseout' do: aBlock
!

onMouseOver: aBlock
	self asJQuery bind: 'mouseover' do: aBlock
!

onMouseUp: aBlock
	self asJQuery bind: 'mouseup' do: aBlock
!

onSelect: aBlock
	self asJQuery bind: 'select' do: aBlock
!

onSubmit: aBlock
	self asJQuery bind: 'submit' do: aBlock
!

onUnload: aBlock
	self asJQuery bind: 'unload' do: aBlock
! !

!TagBrush methodsFor: 'initialization'!

initializeFromJQuery: aJQuery canvas: aCanvas
	element := aJQuery get: 0.
	canvas := aCanvas
!

initializeFromString: aString canvas: aCanvas
	element := self createElementFor: aString.
	canvas := aCanvas
! !

!TagBrush methodsFor: 'private'!

createElementFor: aString
	<return document.createElement(String(aString))>
!

createTextNodeFor: aString
	<return document.createTextNode(String(aString))>
! !

!TagBrush class methodsFor: 'instance creation'!

fromJQuery: aJQuery canvas: aCanvas
	^self new
	initializeFromJQuery: aJQuery canvas: aCanvas;
	yourself
!

fromString: aString canvas: aCanvas
	^self new
	initializeFromString: aString canvas: aCanvas;
	yourself
! !

TagBrush subclass: #StyleTag
	instanceVariableNames: 'canvas element'
	package: 'Canvas'!
!StyleTag commentStamp!
I'm a `<style>` tag use to inline CSS or load a stylesheet.

## Motivation

The need for a specific class comes from Internet Explorer compatibility issues.!

!StyleTag methodsFor: 'adding'!

with: aString
	HTMLCanvas isMSIE
		ifTrue: [self element styleSheet cssText: aString ]
		ifFalse: [super with: aString ].
! !

!StyleTag class methodsFor: 'instance creation'!

canvas: aCanvas
	^self new
	initializeFromString: 'style' canvas: aCanvas;
	yourself
! !

Object subclass: #Widget
	instanceVariableNames: ''
	package: 'Canvas'!
!Widget commentStamp!
I am a presenter building HTML. Subclasses are typically reusable components.

## API

Use `#renderContentOn:` to build HTML. (See `HTMLCanvas` and `TagBrush` classes for more about building HTML).

To add a widget to the page, the convenience method `#appendToJQuery:` is very useful.

Exemple: 

    Counter new appendToJQuery: 'body' asJQuery!

!Widget methodsFor: 'adding'!

appendToBrush: aTagBrush
	self appendToJQuery: aTagBrush asJQuery
!

appendToJQuery: aJQuery
	self renderOn: (HTMLCanvas onJQuery: aJQuery)
! !

!Widget methodsFor: 'rendering'!

renderOn: html
	self
! !

!Widget class methodsFor: 'helios'!

heliosClass
	^ 'widget'
! !

!Object methodsFor: '*Canvas'!

appendToBrush: aTagBrush
	aTagBrush append: self asString
!

appendToJQuery: aJQuery
	aJQuery append: self asString
! !

!BlockClosure methodsFor: '*Canvas'!

appendToBrush: aTagBrush
	aTagBrush appendBlock: self
!

appendToJQuery: aJQuery
	self value: (HTMLCanvas onJQuery: aJQuery)
! !

!CharacterArray methodsFor: '*Canvas'!

asSnippet
	^ HTMLSnippet current snippetAt: self asString
! !

!String methodsFor: '*Canvas'!

appendToBrush: aTagBrush
	aTagBrush appendString: self
!

appendToJQuery: aJQuery
	aJQuery append: self
!

asJQuery
	<return jQuery(String(self))>
! !

!JSObjectProxy methodsFor: '*Canvas'!

asJQuery
	<return jQuery(self['@jsObject'])>
! !