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compass で sprite を利用して画像置換をするときの mixin

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mixin

%base-properties-img-replacement-sprite{
    overflow: hidden;
    padding: 0;
    border: none;
    font: 0/0 a;
    text-shadow: none;
    text-decoration: none;
    color: transparent;
}
@mixin img-replacement-sprite($map: false, $bg-url: false, $name: false, $display: inline-block, $margin: false, $valign: false) {
    @extend %base-properties-img-replacement-sprite;
    @if $display == inline-block {
        @include inline-block;
    } @else if $display == block {
        display: block;
    } @else {
        @include inline-block;
    }
    @if $margin {
        margin: unquote($margin);
    }
    @if $bg-url {
        background-image: $bg-url;
        background-repeat: no-repeat;
    } @else {
        background-repeat: no-repeat;
    }
    @if $map and $name {
        background-position: sprite-position($map, $name);
        width: image-width( sprite-file($map, $name) );
        height: image-height( sprite-file($map, $name) );
    }
    @if $valign {
        vertical-align: $valign;
    }
    @if $legacy-support-for-ie6 or $legacy-support-for-ie7 {
        *text-indent: 0;
        *line-height: 9999px;
        *text-align: left;
        *word-wrap: normal;
    }
}

使うとき

@import "spr/icons/*.png";
$spr-icons: sprite-map("spr/icons/*.png");
$spr-url-icons: sprite-url($spr-icons);

i.new{
    @include img-replacement-sprite( $spr-icons, $spr-url-icons, new, false, false, middle );
}

とりあえずこれで困ってないけど、もっといい書き方あったら知りたい><

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