Awesome

Click on the image above to start Visual Formatting :D

The Visual Format Editor allows you to parse and preview Apple's Visual Format Language. It is built using Cassowary.js, AutoLayout.js, famo.us and famous-flex.

Query arguments

The Visual Format Editor can be customized by specifying query-arguments:

Argument	Type	Description
`vfl`	`string`	The vfl definition to display.
`extended`	`0` / `1`	Enables or disables extended vfl mode (default: enabled).
`spacing`	`array`,`number`	Spacing to use (default: 8).
`mode`	`string`	Appearence mode: `default`, `compact`, `nolog`, `preview`.
`settings`	`0` / `1`	Shows or hides the settings pane (default: 1).

Example:

visualformat-editor/.../index.html?spacing=[20,10]&extended=0

Visual format meta info

Additional meta-info can be added in the form of comments. Using this meta-info, you can instruct the viewer to for instance use a specific aspect ratio or a specific color for a sub-view:

//viewport aspect-ratio:3/1 max-height:300
//colors red:#FF0000 green:#00FF00 blue:#0000FF
//shapes red:circle green:circle blue:circle
H:|-[row:[red(green,blue)]-[green]-[blue]]-|
V:|[row]|

View this example online

Meta-info is also processed by renderers. If you want to set the meta-info only for previewing purposes, then prefix it with a -. The following example sets the max-width and max-height for previewing a mobile layout. The actual layout renderer will ignore this meta-info.

//-viewport max-width:320 max-height:500
//heights header:44 footer:44
V:|[col:[header][content][footer]]|
H:|[col]|

Category	Property	Example
`viewport`	`aspect-ratio:{width}/{height}`	`//viewport aspect-ratio:16/9`
	`width:[{number}/intrinsic]`	`//viewport width:10`
	`height:[{number}/intrinsic]`	`//viewport height:intrinsic`
	`min-width:{number}`
	`max-width:{number}`
	`min-height:{number}`
	`max-height:{number}`
`spacing`	`[{number}/array]`	`//spacing:8` or `//spacing:[10, 20, 5]`
`widths`	`{view-name}:[{number}/intrinsic]`	`//widths subview1:100`
`heights`	`{view-name}:[{number}/intrinsic]`	`//heights subview1:intrinsic`
`colors`	`{view-name}:{color}`	`//colors redview:#FF0000 blueview:#00FF00`
`shapes`	`{view-name}:[circle/square]`	`//shapes avatar:circle`

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