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frontend-bootcamp/step2-03/README.md
2019-02-19 14:14:34 -08:00

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# Step 2.3: Theming and Styling
Theming and Styling with UI Fabric. In this section, we will illustrate how to utilize some of the built-in theming and styling features right inside UI Fabric component library. UI Fabric exposes its own css-in-js library called `mergeStyles` that is very performant compared with other similar libraries.
# Exercises
## Themes - Using Predefined Theme
Apply some included and predefined themes from the UI Fabric package inside the `/step2-03/exercise/src/components/TodoApp.tsx`. Do this by replacing:
```ts
import { FluentCustomizations } from '@uifabric/fluent-theme';
```
with:
```ts
import { TeamsCustomizations } from '@uifabric/theme-samples';
```
## Themes - Customized Theme
Create your own theme and apply the color here: https://developer.microsoft.com/en-us/fabric#/styles/themegenerator
```ts
import { loadTheme } from 'office-ui-fabric-react';
loadTheme({
palette: {
themePrimary: '#0078d4',
themeLighterAlt: '#eff6fc',
themeLighter: '#deecf9',
themeLight: '#c7e0f4',
themeTertiary: '#71afe5',
themeSecondary: '#2b88d8',
themeDarkAlt: '#106ebe',
themeDark: '#005a9e',
themeDarker: '#004578',
neutralLighterAlt: '#f8f8f8',
neutralLighter: '#f4f4f4',
neutralLight: '#eaeaea',
neutralQuaternaryAlt: '#dadada',
neutralQuaternary: '#d0d0d0',
neutralTertiaryAlt: '#c8c8c8',
neutralTertiary: '#c2c2c2',
neutralSecondary: '#858585',
neutralPrimaryAlt: '#4b4b4b',
neutralPrimary: '#333333',
neutralDark: '#272727',
black: '#1d1d1d',
white: '#ffffff'
}
});
```
1. Delete the `Customizer` component
2. Paste in this code in the `TodoApp.tsx` before the `TodoApp` component definition
3. Play around with the values and use intellisense to discover the `ITheme` type within VS Code
## CSS in JS with MergeStyles
The styling library name is glamorous nor does it bring about emotion, but it is very quick and lightweight. `MergeStyles` turns CSS Rules into CSS class names to be applied to the components.
1. Try applying a merged style `className` as a prop inside any component that you would find.
```tsx
import { mergeStyles } from 'office-ui-fabric-react';
const className = mergeStyles({
backgroundColor: 'red',
selectors: {
':hover': {
backgroundColor: 'blue'
}
}
});
```
2. Try to give a few components extra padding