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Computing with ioLProgrammer's GuideLanguage Reference

＃ operator? operator@ operatorabs tagadd tagalign fieldand tagarray tagaudio tagbackgroundColor fieldbold fieldborder fieldborderBottom fieldborderColor fieldborderLeft fieldborderRight fieldborderStyle fieldborderTop fieldbottom fieldbox tagbutton tagcarat fieldcheckBox tagchoiceBox tagclass tagclear tagclientFrame tagcolor fieldconsole tagdialog tagdiv tagdo fieldeditable fieldellipse tagelse fieldeq tagfalse tagfocus fieldfocusOrder fieldfont fieldfor tagformat fieldge taggt tagheight fieldhotKey fieldif tagimg taginf taginline fieldinput taginvalid tagint tagitalic fieldjoin taglayer fieldle tagleft fieldlimit fieldline taglt tagmargin fieldmarginBottom fieldmarginLeft fieldmarginRight fieldmarginTop fieldmod tagmul tagne tagneg tagnot tagnull tagnum tagonClear fieldonClick fieldonContextClick fieldonExit fieldonFocus fieldonGet fieldonInput fieldonKeyDown fieldonSet fieldonKeyPress fieldonKeyUp fieldonMouseDown fieldonMouseIn fieldonMouseMove fieldonMouseOut fieldonMouseUp fieldonPull fieldonPush fieldonResize fieldonTimer fieldopenLink tagopacity fieldor tagpivot fieldplaying fieldput tagputError tagputLn tagrequestTransfer tagright fieldrotate fieldscalar tagscroll fieldscrollPos fieldselectable fieldsize fieldspacing fieldspacingBottom fieldspacingLeft fieldspacingRight fieldspacingTop fieldspan tagsplit tagsub tagtable tagtabRow tagthen fieldtimer tagtop fieldtransfer tagtransferAbility tagtransition fieldtrue tagunderline fieldvector tagvideo tagvisible fieldvoid tagwidth fieldwith fieldwrap fieldxor tag

layer field

Scalar field

When multiple presentation tags produce visual content that obscure or overlap each other in the same place, the layer field can be used to prioritise which tags should be rendered in front of (or behind) other tags.

Sample usage

<box inline=false top=20 left=20 width=150 height=80 backgroundColor={red} layer=2 {In front}>
<box inline=false top=50 left=80 width=150 height=80 backgroundColor={blue} layer=1 {Behind}>

Behaviour

Takes a number. When tags positioned with inline=false overlap, a tag with a higher layer value is drawn in front of a tag with a lower value, whichever was created first.

Normally, presentation tags are rendered inline and do not obscure one another, however the layer field becomes useful when presentation tags are created with inline=false and custom positioning is applied.

See also