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POCan I define a LESS mixin to generate a transition-property with a variable number of parameters?
 

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  1. POCan I define a LESS mixin to generate a transition-property with a variable number of parameters?
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    <p>I'm introducing LESS to a large web app project to simplify my CSS. I've got a few CSS rules which apply transitions to a varying number of properties, for example:</p> <pre><code>.movable { transition-property: top, left; transition-duration: 0.2s; transition-timing-function: ease; } .fadeAndStretchable { transition-property: opacity, width, height, margin; transition-duration: 1.5s; transition-timing-function: ease-out; } </code></pre> <p>(Note: I've omitted <code>-webkit</code>, <code>-moz</code> and <code>-o</code> properties here for brevity: in reality each of these rules is 12 lines long rather than 3.)</p> <p>Note that the values for <code>transition-property</code> are comma-separated. This is unusual in CSS: multiple values are usually space-separated (as in <code>border: 1px solid #f00</code>). LESS mixins can use the special <code>@arguments</code> value to <a href="http://lesscss.org/#-parametric-mixins" rel="nofollow noreferrer">produce a space-separated list of all the mixin arguments</a> - but is it possible to define a LESS mixin that takes a variable number of parameters and turns them into a comma-separated value list, suitable for <code>transition-property</code>?</p> <p>If necessary, I'm happy with a solution that requires two mixins: one for <code>transition-property</code> and another for <code>transition-duration</code> and <code>transition-timing-function</code>. Here's what I've tried so far:</p> <h3>Attempt 1: using @arguments with unnamed parameters</h3> <pre><code>.transition-property() { -webkit-transition-property: @arguments; -moz-transition-property: @arguments; -o-transition-property: @arguments; transition-property: @arguments; } .movable { .transition-property(top, left); } </code></pre> <p>Result: LESS error ("No matching definition was found for '.transition-property(top, left)'")</p> <h3>Attempt 2: using @arguments with named parameters</h3> <pre><code>.transition-property(@p1, @p2, @p3, @p4, @p5) { -webkit-transition-property: @arguments; -moz-transition-property: @arguments; -o-transition-property: @arguments; transition-property: @arguments; } .movable { .transition-property(top, left); } </code></pre> <p>Result: LESS error ("No matching definition was found for '.transition-property(top, left)'")</p> <h3>Attempt 3: using named parameters with dummy default values</h3> <pre><code>.transition-property(@p1:p1, @p2:p2, @p3:p3, @p4:p4, @p5:p5) { -webkit-transition-property: @p1, @p2, @p3, @p4, @p5; -moz-transition-property: @p1, @p2, @p3, @p4, @p5; -o-transition-property: @p1, @p2, @p3, @p4, @p5; transition-property: @p1, @p2, @p3, @p4, @p5; } .movable { .transition-property(top, left); } </code></pre> <p>Result: No LESS error but it generates a CSS rule <code>-webkit-transition-property: top, left, p3, p4, p5</code> that the browser ignores because of the unrecognised properties.</p> <p>I've tried various other approaches (e.g. passing the property as a string <code>'top,left'</code>) but all result in the same thing: either a LESS error or invalid CSS.</p> <p><strong>Is there any way round this?</strong> Or do I have to bite the bullet and define a set of mixins overloaded on arity, e.g.</p> <pre><code>.transition-property(@p1) {...} .transition-property(@p1, @p2) {...} .transition-property(@p1, @p2, @p3) {...} .transition-property(@p1, @p2, @p3, @p4) {...} etc. </code></pre>
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