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evrone/postcss-px-to-viewport: A plugin for PostCSS that generates viewport units (vw, vh, vmin, vmax) from pixel units. The best choice to create a scalable interface on different displays by one design size.

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A plugin for PostCSS that generates viewport units (vw, vh, vmin, vmax) from pixel units.

If your project involves a fixed width, this script will help to convert pixels into viewport units.

.class {
  margin: -10px .5vh;
  padding: 5vmin 9.5px 1px;
  border: 3px solid black;
  border-bottom-width: 1px;
  font-size: 14px;
  line-height: 20px;
}

.class2 {
  padding-top: 10px; /* px-to-viewport-ignore */
  /* px-to-viewport-ignore-next */
  padding-bottom: 10px;
  /* Any other comment */
  border: 1px solid black;
  margin-bottom: 1px;
  font-size: 20px;
  line-height: 30px;
}

@media (min-width: 750px) {
  .class3 {
    font-size: 16px;
    line-height: 22px;
  }
}

.class {
  margin: -3.125vw .5vh;
  padding: 5vmin 2.96875vw 1px;
  border: 0.9375vw solid black;
  border-bottom-width: 1px;
  font-size: 4.375vw;
  line-height: 6.25vw;
}

.class2 {
  padding-top: 10px;
  padding-bottom: 10px;
  /* Any other comment */
  border: 1px solid black;
  margin-bottom: 1px;
  font-size: 6.25vw;
  line-height: 9.375vw;
}

@media (min-width: 750px) {
  .class3 {
    font-size: 16px;
    line-height: 22px;
  }
}

Add via npm

$ npm install postcss-px-to-viewport --save-dev

or yarn

$ yarn add -D postcss-px-to-viewport

Default Options:

{
  unitToConvert: 'px',
  viewportWidth: 320,
  unitPrecision: 5,
  propList: ['*'],
  viewportUnit: 'vw',
  fontViewportUnit: 'vw',
  selectorBlackList: [],
  minPixelValue: 1,
  mediaQuery: false,
  replace: true,
  exclude: undefined,
  include: undefined,
  landscape: false,
  landscapeUnit: 'vw',
  landscapeWidth: 568
}

• unitToConvert (String) unit to convert, by default, it is px.
• viewportWidth (Number) The width of the viewport.
• unitPrecision (Number) The decimal numbers to allow the vw units to grow to.
• propList (Array) The properties that can change from px to vw.
  • Values need to be exact matches.
  • Use wildcard * to enable all properties. Example: ['*']
  • Use * at the start or end of a word. (['position'] will match background-position-y)
  • Use ! to not match a property. Example: ['*', '!letter-spacing']
  • Combine the "not" prefix with the other prefixes. Example: ['', '!font']
• viewportUnit (String) Expected units.
• fontViewportUnit (String) Expected units for font.
• selectorBlackList (Array) The selectors to ignore and leave as px.
  • If value is string, it checks to see if selector contains the string.
    • ['body'] will match .body-class
  • If value is regexp, it checks to see if the selector matches the regexp.
    • [/^body$/] will match body but not .body
• minPixelValue (Number) Set the minimum pixel value to replace.
• mediaQuery (Boolean) Allow px to be converted in media queries.
• replace (Boolean) replaces rules containing vw instead of adding fallbacks.
• exclude (Regexp or Array of Regexp) Ignore some files like 'node_modules'
  • If value is regexp, will ignore the matches files.
  • If value is array, the elements of the array are regexp.
• include (Regexp or Array of Regexp) If include is set, only matching files will be converted, for example, only files under src/mobile/ (include: /\/src\/mobile\//)
  • If the value is regexp, the matching file will be included, otherwise it will be excluded.
  • If value is array, the elements of the array are regexp.
• landscape (Boolean) Adds @media (orientation: landscape) with values converted via landscapeWidth.
• landscapeUnit (String) Expected unit for landscape option
• landscapeWidth (Number) Viewport width for landscape orientation.

exclude and include can be set together, and the intersection of the two rules will be taken.

You can use special comments for ignore conversion of single lines:

• /* px-to-viewport-ignore-next */ — on a separate line, prevents conversion on the next line.
• /* px-to-viewport-ignore */ — after the property on the right, prevents conversion on the same line.

Example:

/* example input: */
.class {
  /* px-to-viewport-ignore-next */
  width: 10px;
  padding: 10px;
  height: 10px; /* px-to-viewport-ignore */
  border: solid 2px #000; /* px-to-viewport-ignore */
}

/* example output: */
.class {
  width: 10px;
  padding: 3.125vw;
  height: 10px;
  border: solid 2px #000;
}

There are several more reasons why your pixels may not convert, the following options may affect this: propList, selectorBlackList, minPixelValue, mediaQuery, exclude, include.

add to your postcss.config.js

module.exports = {
  plugins: {
    // ...
    'postcss-px-to-viewport': {
      // options
    }
  }
}

add to your gulpfile.js:

var gulp = require('gulp');
var postcss = require('gulp-postcss');
var pxtoviewport = require('postcss-px-to-viewport');

gulp.task('css', function () {

    var processors = [
        pxtoviewport({
            viewportWidth: 320,
            viewportUnit: 'vmin'
        })
    ];

    return gulp.src(['build/css/**/*.css'])
        .pipe(postcss(processors))
        .pipe(gulp.dest('build/css'));
});

Please read Code of Conduct and Contributing Guidelines for submitting pull requests to us.

In order to run tests, you need to install dev-packages:

Then run the tests via npm script:

The changelog is here.

We use SemVer for versioning. For the versions available, see the tags on this repository.

• Dmitry Karpunin - Initial work
• Ivan Bunin

See also the list of contributors who participated in this project.

This project is licensed under the MIT License.

Visit Evrone website to get more information about the projects build.

• Hat tip to https://github.com/cuth/postcss-pxtorem/ for inspiring us for this project.

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