57 lines
3.0 KiB
Markdown
57 lines
3.0 KiB
Markdown
<!--docs:
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title: "RTL"
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layout: detail
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section: components
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excerpt: "Right-to-left and bi-directional text layout via SCSS helpers."
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path: /catalog/rtl/
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-->
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# RTL
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UIs for languages that are read from right-to-left (RTL), such as Arabic and Hebrew, should be mirrored to ensure content is easy to understand.
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## Design & API Documentation
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<ul class="icon-list">
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<li class="icon-list-item icon-list-item--spec">
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<a href="https://material.io/go/design-bidirectionality">Material Design guidelines: Bidirectionality</a>
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</li>
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</ul>
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## Installation
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```
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npm install @material/rtl
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```
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## Usage
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### Sass Mixins
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`rtl` is the most flexible mixin, because it can work with multiple CSS properties. All other RTL mixins logic could be engineered by only using `rtl`, but we provide these mixins for convenience.
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Both `reflexive-property` and `reflexive-box` work with one base box-model property, e.g. margin, border, padding. But `reflexive-property` is more flexible because it accepts different left and right values. `reflexive-box` assumes the left and right values are the same, and therefore that the box-model is symmetrical.
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`reflexive-position` is the least flexible mixin. It only works with one horizontal position property, "left" or "right". It also assumes the left and right values are the same.
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| Mixin | Description |
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| ----------------------------------------------- | - |
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| `rtl($root-selector)` | Creates a rule that is applied when the root element is within an RTL context |
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| `reflexive-box($base-property, $default-direction, $value, $root-selector)` | Applies the value to the `#{$base-property}-#{$default-direction}` property in a LTR context, and flips the direction in an RTL context. **This mixin zeros out the original value in an RTL context.** |
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| `reflexive-property($base-property, $left-value, $right-value, $root-selector)` | Emits rules that assign `#{$base-property}`-left to `#{left-value}` and `#{base-property}`-right to `#{right-value}` in a LTR context, and vice versa in a RTL context. **Basically it flips values between a LTR and RTL context.** |
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| `reflexive-position($position-property, $value, $root-selector)` | Applies the value to the specified position in a LTR context, and flips the direction in an RTL context. `$position-property` is a horizontal position, either "left" or "right". |
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| `reflexive($left-property, $left-value, $right-property, $right-value, $root-selector)` | Applies the pair of property values to the specified position in a LTR context, and flips the direction in an RTL context. |
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**A note about [dir="rtl"]**: `rtl($root-selector)` checks for `[dir="rtl"]` on the ancestor element. This works in most cases, it will sometimes lead to false negatives for more complex layouts, e.g.
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```html
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<html dir="rtl">
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<!-- ... -->
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<div dir="ltr">
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<div class="mdc-foo">Styled incorrectly as RTL!</div>
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</div>
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</html>
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```
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Unfortunately, we've found that this is the best we can do for now. In the future, selectors such as [:dir](http://mdn.io/:dir) will help us mitigate this.
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