Customise the controls of fabric.js

Implementation of a way of changing the icon / cursor / action of the fabric.js corner controls.

Install

bower install fabric-customise-controls --save

Live Demo Page

http://pixolith.github.io/fabricjs-customise-controls-extension/example/index.html

What is this?

This is an extension which overwrites certain functions in the fabric.js core to enable you to customise the controls through easy settings in your fabric.js project preserving the opportunity to update the fabric.js libary in the future.

Why would you want this?

Well, i have felt the need to adapt the fabric.js UI to the project is is put in. Especially special actions and icons for the controls were needed. Since you can't do that without massively hacking the core, it seemed cleaner to create this for future use.

How to use

Add customiseControls.js (or its minified version) to your fabric.js project and reference in your html:

<script defer src="../path-to/fabric.min.js"></script>
<script defer src="../path-to/customiseControls.js"></script>

Customising the Controls:

fabric.Canvas.prototype.customiseControls({
    tl: {
        action: 'rotate',
        cursor: 'cow.png'
    },
    tr: {
        action: 'scale'
    },
    bl: {
        action: 'remove',
        cursor: 'pointer'
    },
    br: {
        action: 'moveUp',
        cursor: 'pointer'
    },
    mb: {
        action: 'moveDown',
        cursor: 'pointer'
    },
    mt: {
        action: {
            'rotateByDegrees': 45
        }
    }
});

This will overwrite the actions and cursor handler for adding custom actions.

tl: object

top-left corner passing an object consisting of corner action (see Actions) and cursor (see Cursors)

Actions:

currently the following actions are possible:

drag
scale
scaleX
scaleY
rotate
remove (custom)
moveUp (z-index, custom) since 0.0.3
moveDown (z-index, custom) since 0.0.3
rotateByDegrees: int (custom) since 0.0.4 (pls note that the objects originX and originY need to be set to center)

Default action is: 'scale'

Cursors:

currently the native cursors are possible as well as a custom cursor url.

Depending on what you set the javascript will detect if you have set an image which needs to be loaded or a native cursor.

Default is: resize direction cursor

Customising the Corner Icons

fabric.Object.prototype.customiseCornerIcons({
    settings: {
        borderColor: 'black',
        cornerSize: 25,
        cornerShape: 'rect',
        cornerBackgroundColor: 'black',
        cornerPadding: 10
    },
    tl: {
        icon: 'icons/rotate.svg'
    },
    tr: {
        icon: 'icons/resize.svg'
    },
    bl: {
        icon: 'icons/remove.svg'
    },
    br: {
        icon: 'icons/up.svg'
    },
    mb: {
        icon: 'icons/down.svg'
    }
});

This will overwrite the controls handler (for all Objects) for adding custom icons and corresponding background-shapes and colors (since 0.0.3).

cornerSize: int

size in pixels of the corner control box

cornerShape: string ('rect', 'circle')

shape of the corner control box

borderColor: string (color)

color of the bounding box border

cornerBackgroundColor: string (color)

color of the background shape

cornerPadding: int

inner Padding between icon image and background shape

tl: object

corner-type passing an object with the desired icon url

You can also set these settings Object specific using inheritance of this prototype (since 0.0.3):

yourFabricObject.customiseCornerIcons({
    settings: {
        borderColor: 'black',
        cornerSize: 25,
        cornerShape: 'rect',
        cornerBackgroundColor: 'black',
        cornerPadding: 10
    },
    tl: {
        icon: 'icons/rotate.svg'
    },
    tr: {
        icon: 'icons/resize.svg'
    },
    bl: {
        icon: 'icons/remove.svg'
    },
    br: {
        icon: 'icons/up.svg'
    },
    mb: {
        icon: 'icons/down.svg'
    }
});

Default is: currently not drawing anything but displaying a warning that your image might be corrupt unless cornerShape is set. Then it will draw the Shape and display a console warn about the image url.

You can set the size of the control icons or the border color with the standard setter too if you like to, yet it is also included in the function above.

fabric.Object.prototype.set( {
    borderColor: '#000000',
    cornerSize: 34,
    } );

That should be it, feel free to contact me concerning bugs or improvements.

Note

American english can be used too, so calling:

fabric.Object.prototype.customizeCornerIcons
fabric.Canvas.prototype.customizeControls

works too.

Example Implementation

There is an example implementation in the example folder, just open the index file and check out how the custom handles look like when applied to the test images. The source for that is also provided in the example.js.

Usage

Licensed under the MIT license.

b3nl / fabricjs-customise-controls-extension