css - LESScss converting rgba to hex? how to nest color variables into a mixin? -

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does lesscss convert rgba colors hex values?

i trying create mixin, say, .color, allows pass in color variable defined, , want in rgba.

this doesn't work, here's idea:

.bgcolor(@colorvariable,@alpha) {      background-color: @colorvariable + rgba(0, 0, 0, @alpha);      }

where @colorvariable be, @blue: rgb(17,55,76); or @green: rgb(125,188,83); etc.

i want define bunch of these variables, , able pass them in .bgcolor or .color mixin , change alpha transparency on fly.

i feel should possible, missing something. -right now, code ever outputs hex color value, no matter input.- if pass in @alpha value of 1, outputs hex color value. @alpha values less 1 force browser show me rgba value. that's solved.

now--how pass in rgb , parts separately predefined variable?

turns out, less has hsla functions built in (see less color functions). help, here's discovered:

    @dkblue: #11374c;     .colorize_bg(@color: @white, @alpha: 1) {            background: hsla(hue(@color), saturation(@color), lightness(@color), @alpha);}

then use mixin:

section {.colorize_bg(@dkblue,1);}

so pass in color variable @dkblue , less' functions hue(@color) take @dkblue , pull out hue, saturation, , lightness values. can pass in alpha define in mixin.

then can use in other ways, define transparent borders. adding background-clip: padding-box; .colorize_bg ensure borders show outside of bg box color (isn't css3 magical?) can redefine mixin work border color:

    .colorize_border(@color: @white, @alpha: 1) {border-color: hsla(hue(@color), saturation(@color), lightness(@color), @alpha);}

and give section border width, style, , define color via mixin:

section {border-width: 0 10px; border-style: solid; .colorize_border(@dkblue, .5);

and you'll magical, shiny transparent borders, so: http://i.stack.imgur.com/4jskr.png


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