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Adding links to styling samples (#1534)

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Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>
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docs/extensions/capabilities/styling.md
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@ -104,38 +104,38 @@ A complete list of themable colors can be found in the [Color Reference](../colo
When the light theme is active, the `<body>` element gets a "theme-light" class, or: `<body class="theme-light">`. If the class isn't there, the theme defaults to dark. The active theme can be changed in the **Preferences** page:
![Color Theme](images/theme-selector.png)
Currently, there is no prescribed way of detecting changes to the theme in JavaScript. [This issue](https://github.com/lensapp/lens/issues/1336) has been raised to resolve this problem. In the meantime, you can use a [MutationObserver](https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver) in order to observe the `<body>` element's `class` attribute in order to see if the "theme-light" class gets added to it:
There is a way of detect active theme and its changes in JS. [MobX observer function/decorator](https://github.com/mobxjs/mobx-react#observercomponent) can be used for this purpose.
```javascript
...
useEffect(function () {
const observer = new MutationObserver(function (mutations: MutationRecord[]) {
mutations.forEach((mutation: MutationRecord) => {
if (mutation.type === 'attributes' && mutation.attributeName === 'class') {
if ((mutation.target as HTMLElement).classList.contains('theme-light')) {
// theme is LIGHT
} else {
// theme is DARK
}
}
});
});
```js
import React from "react"
import { observer } from "mobx-react"
import { App, Component, Theme } from "@k8slens/extensions";
observer.observe(document.body, {
attributes: true,
attributeFilter: ['class'],
});
return function () {
observer.disconnect();
};
}, []); // run once on mount
...
@observer
export class SupportPage extends React.Component {
render() {
return (
<div className="SupportPage">
<h1>Active theme is {Theme.getActiveTheme().name}</h1>
</div>
);
}
}
```
`Theme` entity from `@k8slens/extensions` provides active theme object and `@observer` decorator makes component reactive - so it will rerender each time any of the observables (active theme in our case) will be changed.
Working example provided in [Styling with Emotion](https://github.com/lensapp/lens-extension-samples/tree/master/styling-emotion-sample) sample extension.
## Injected Styles
Every extension is affected by the list of default global styles defined in [app.scss](https://github.com/lensapp/lens/blob/master/src/renderer/components/app.scss). These are basic browser resets and element styles, including setting the `box-sizing` property for every element, default text and background colors, default font sizes, basic heading formatting, and so on.
Every extension is affected by the list of default global styles defined in [app.scss](https://github.com/lensapp/lens/blob/master/src/renderer/components/app.scss). These are basic browser resets and element styles, including:
- setting the `box-sizing` property for every element
- default text and background colors
- default font sizes
- basic heading (h1, h2, etc) formatting
- custom scrollbar styling
Extensions may overwrite these defaults if needed. They have low CSS specificity, so overriding them should be fairly easy.
@ -148,3 +148,11 @@ const Container = styled.div(() => ({
backgroundColor: 'var(--mainBackground)'
}));
```
## Examples
You can explore samples for each styling technique that you can use for extensions:
- [Styling with Sass](https://github.com/lensapp/lens-extension-samples/tree/master/styling-sass-sample)
- [Styling with Emotion](https://github.com/lensapp/lens-extension-samples/tree/master/styling-emotion-sample)
- [Styling with CSS Modules](https://github.com/lensapp/lens-extension-samples/tree/master/styling-css-modules-sample)