feat(segmented-button): Add new package for segmented button

[gschrag]

create segmented button component to let user manipulate toggle values of a group of related buttons

[abhiomkar]

nit: mdc-segmented-button.scss => styles.scss

go/material-sass-style#css-style-modules (See shared doc if you're not able to access).

[abhiomkar]

Can you remove "Closes PR number" line from PR description. GitHub will automatically closes issue when this PR is merged which is not what we wanted.

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[abhiomkar]

Add following Copyright lines to all Sass files instead of empty files.

//
// Copyright 2020 Google Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//

// TODO: Add styles.

[gschrag]

@abhiomkar do you know why adding the package.json "description" field in commit e76a6ad broke the dependency test?

[abhiomkar]

Test failure is expected. You'll need to edit CSS bundle factory to include new segmented styles. https://github.com/material-components/material-components-web/blob/master/scripts/webpack/css-bundle-factory.js

'mdc.segmented-button': getAbsolutePath('/packages/mdc-segmented-button/styles.scss'),

[gschrag]

I've noticed that all other mdc components have a '.scss' (e.g. 'mdc-button.scss') instead of a 'styles.scss'. I've also noticed that this style decision and others discussed in go/material-sass-style don't match how the sass files are actually implemented by mdc components. Is go/material-sass-style meant for a different repository?

[abhiomkar]

LGTM.