Angular
Flex
Layout
Sophisticated component layout engine for
Angular
Ekaterina Orlova
github.com/cheerypick
Frontend web dev /Accenture Norway
Co-organizer of Mobile Era Oslo
Angular trainer @ Netology Russia
@cheerypick
Flexbox CSS
+
mediaQuery
Browser support
Why
@angular/flex-layout?
Pure TypeScript layout engine
Independent of Angular Material
...but they work fine together
No external CSS stylesheets
Angular CLI Integration
Static API
Responsive API
npm install --save @angular/flex-layout@latest
import { FlexLayoutModule }
from '@angular/flex-layout';
...
@NgModule({
imports: [FlexLayoutModule],
...
})
export class AppModule { }
Import Angular Flex-Layout NgModule
Install Angular Flex-Layout
Static Layout API
CSS Flexbox Model
API for DOM containers
fxLayout |
|
---|---|
fxLayoutWrap |
|
fxLayoutGap |
|
fxLayoutAlign |
<div fxLayout="row"
fxLayout.xs="column"> </div>
<div fxLayoutWrap> </div>
<div fxLayoutGap="10px"> </div>
<div fxLayoutAlign="start stretch">
</div>
fxLayout API
<div fxLayout="row">
<div>One</div>
<div>Two</div>
<div>Three</div>
<div>Four</div>
</div>
<div fxLayout="column">
<div>One</div>
<div>Two</div>
<div>Three</div>
<div>Four</div>
</div>
fxLayout options
<div fxLayout="row-reverse">
...
</div>
Value | Equivalent CSS |
---|---|
default | {flex-direction: row} |
row | {flex-direction: row} |
row-reverse | {flex-direction: row-reverse} |
column | {flex-direction: column} |
column-reverse | {flex-direction: column-reverse} |
API for flex elements
fxFlex |
|
---|---|
fxFlexOrder |
|
fxFlexOffset |
|
fxFlexAlign |
|
fxFlexFill |
<div fxFlex="1 2
calc(15em + 20px)"></div>
<div fxFlexOrder="2"></div>
<div fxFlexOffset="20px"></div>
<div fxFlexAlign="center"></div>
<div fxFlexFill></div>
fxFlex API
-
flex-grow
-
flex-shrink
-
flex-basis
3 parameters:
flex-grow
Defines how much a flexbox item should grow ( proportional to the others) if there's space available.
flex-shrink
defines how much a flexbox item should shrink if there is not enough space available.
flex-basis
controls the default size of the element
fxFlex
<div fxLayout="row" fxLayoutAlign="center">
<div fxFlex="1 1 auto">One</div>
<div fxFlex="5 1 auto">Two</div>
<div fxFlex="1 1 auto">Three</div>
<div fxFlex="1 1 auto">Four</div>
</div>
fxFlex options
- fxFlex
- fxFlex="2 2 calc(10em + 10px)"
- fxFlex="102px"
- fxFlex="auto"
The flex-basis values can be pixels, percentages, calcs, em, vw, vh, or known aliases.
alias | Equivalent CSS |
---|---|
grow | {flex: 1 1 100%} |
initial | {flex: 0 1 auto} |
auto | {flex: <grow> <shrink> 100%} |
none | {flex: 0 0 auto} |
nogrow | {flex: 0 1 auto} |
noshrink | {flex: 1 0 auto} |
Runtime expressions
To use runtime expressions, developers should use the box-notation to specify 1-way DataBind (to an expression).
<div [fxFlex]="twoColumnSpan">...</div>
Responsive API
Material Design Breakpoints
Media Queries and Aliases
breakpoint | mediaQuery |
---|---|
xs | 'screen and (max-width: 599px)' |
sm | 'screen and (min-width: 600px) and (max-width: 959px)' |
md | 'screen and (min-width: 960px) and (max-width: 1279px)' |
lg | 'screen and (min-width: 1280px) and (max-width: 1919px)' |
xl | 'screen and (min-width: 1920px) and (max-width: 5000px)' |
lt-sm | 'screen and (max-width: 599px)' |
lt-md | 'screen and (max-width: 959px)' |
lt-lg | 'screen and (max-width: 1279px)' |
lt-xl | 'screen and (max-width: 1919px)' |
gt-xs | 'screen and (min-width: 600px)' |
gt-sm | 'screen and (min-width: 960px)' |
gt-md | 'screen and (min-width: 1280px)' |
gt-lg | 'screen and (min-width: 1920px)' |
Visibility example
<div fxShow fxHide.xs="false" fxHide.lg="true"></div>
- xl, then fallback to the default fxShow; so the div is shown
- lg, then the div is hidden (since the value === 'true')
- md, then fallback to the default fxShow; so the div is shown
- sm, then fallback to the default fxShow; so the div is shown
- xs, then the div is shown (since the value === 'false')
Sizing example
<div fxFlex="50%" fxFlex.gt-sm="100%"></div>
- xl, then fallback to 'gt-sm' so the div sizing is 100%
- lg, then fallback to 'gt-sm' so the div sizing is 100%
- md, then fallback to 'gt-sm' so the div sizing is 100%
- sm, then fallback to the default fxFlex="50%"; so the div is 50%
- xs, then fallback to the default fxFlex="50%"; so the div is 50%
Special Responsive Features
fxShow |
|
---|---|
fxHide |
|
ngClass |
|
ngStyle |
<div fxShow
[fxShow.xs]="isVisibleOnMobile()"></div>
<div fxHide
[fxHide.gt-sm]="isVisibleOnDesktop()"></div>
<div
[ngClass.sm]="{'fxClass-sm': hasStyle}"></div>
<div
[ngStyle.xs]="{color: 'blue'}"></div>
ngClass API
@angular/flex-layout ngClass directive is a subclass of the @angular/common ngClass directive
Classname assignments with selector (and its responsive versions) are destructive and will overwrite any existing classnames in use.
class
<div class="default" class.xs="responsive"></div>
This div has either default or responsive class assigned!
ngClass API
The Flex-Layout ngClass adds responsive features to add/remove CSS classes for activated breakpoints
<some-element ngClass="first second"
[ngClass.xs]="{'first':false, 'third':true}">
</some-element>
for xs:
- remove the class='first'
- keep the class='second'
- add the class='third'
Adaptive layouts
- different components for different breakpoints
- alter animations based on viewport size
JavaScript API (Imperative)
Programmatic features
ObservableMedia |
|
---|---|
BREAKPOINTS |
|
BaseFxDirectiveAdapter |
constructor(public
media:ObservableMedia ) {}
providers: [{provide: BREAKPOINTS,
useValue: MY_CUSTOM_BREAKPOINTS }]
export class ClassDirective
extends NgClass {}
ObservableMedia
injectable ObservableMedia service provides mediaQuery activations notifications for all registered breakpoints
ObservableMedia:
API summary
- subscribe(): Subscription
- asObservable(): Observable<MediaChange>
- isActive(query: string): boolean
ObservableMedia::subscribe()
subscribe(
next?: (value: MediaChange) => void,
error?: (error: any) => void,
complete?: () => void
): Subscription;
Subscribe to mediaQuery activations
import {Subscription} from "rxjs/Subscription";
import {MediaChange, ObservableMedia}
from "@angular/flex-layout";
constructor(media: ObservableMedia) {
this.watcher = media.subscribe(
(change: MediaChange) => {
if ( change.mqAlias == 'xs') {
this.loadMobileContent();
}
});
}
ObservableMedia::asObservable()
import {Subscription} from "rxjs/Subscription";
import 'rxjs/add/operator/filter';
import {MediaChange, ObservableMedia}
from "@angular/flex-layout";
export class MyDemo {
constructor(media: ObservableMedia) {
media.asObservable()
.filter((change: MediaChange) =>
change.mqAlias == 'xs')
.subscribe(() => this.loadMobileContent() );
}
}
ObservableMedia::isActive()
import {MediaChange, ObservableMedia}
from "@angular/flex-layout";
const PRINT_MOBILE = 'print and (max-width: 600px)';
@Component({
selector : 'responsive-component',
template: `
<div class="ad-content" *ngIf="media.isActive('xs')">
Only shown if on mobile viewport sizes
</div>
`
})
export class MyDemo implements OnInit {
constructor(public media: ObservableMedia) { }
ngOnInit() {
if (this.media.isActive('xs') && !this.media.isActive(PRINT_MOBILE)) {
this.loadMobileContent();
}
}
}
Custom breakpoints
-
Developers can easily override the default breakpoints used within Flex-Layout
-
Build custom providers to override the default BreakPointRegistry provider
Customising breakpoints
import { NgModule } from '@angular/core';
import { DEFAULT_BREAKPOINTS, BreakPoint } from '@angular/flex-layout'
import { validateSuffixes } from '@angular/flex-layout/utils';
/**
* For mobile and tablet, reset ranges
*/
function updateBreakpoints((it:BreakPoint) => {
switch(it.alias) {
case 'xs' : it.mediaQuery = '(max-width: 470px)'; break;
case 'sm' : it.mediaQuery = '(min-width: 471px) and (max-width: 820px)'; break;
}
return it;
})
@NgModule({
providers: [
// register a Custom BREAKPOINT Provider
{
provide : BREAKPOINTS,
useFactory : function customizeBreakPoints() {
return validateSuffixes(RAW_DEFAULTS.map( updateBreakpoints ));
}
}
]
})
export class MyBreakPointsModule { }
"Holy Grail" of layouts
<div>
<header>header</header>
<div>
<nav>nav</nav>
<article>article</article>
<aside>aside</aside>
</div>
<footer>footer</footer>
</div>
<div fxLayout="column">
<header>header</header>
<div fxLayout="row" fxFlex>
<nav fxFlex="1 6 20%">nav</nav>
<article fxFlex="3 1 60%">article</article>
<aside fxFlex="1 6 20%">aside</aside>
</div>
<footer>footer</footer>
</div>
<div fxLayout="column">
<header>header</header>
<div fxLayout="row" fxLayout.xs="column"
fxFlex="1 1 auto">
<nav fxFlex="1 6 20%" fxFlexOrder
fxFlexOrder.xs="2">nav</nav>
<article fxFlex="3 1 60%" fxFlexOrder
fxFlexOrder.xs="1">article</article>
<aside fxFlex="1 6 20%" fxFlexOrder
fxFlexOrder.xs="3">aside</aside>
</div>
<footer>footer</footer>
</div>
Resources
Angular Flex-Layout
https://github.com/angular/flex-layout
Visual guide to Flex
http://cssreference.io/flexbox/
Slides
http://slides.com/cherrypick/deck-9
Demo
https://github.com/cheerypick/flex-app
Gitter Chat
https://gitter.im/angular/flex-layout
Quiz time!
Join at kahoot.it
with Game PIN:
121761
Thank you!
Ekaterina Orlova
@cheerypick
github.com/
twitter.com/
Angular Summit: Angular Flex Layout
By cherrypick
Angular Summit: Angular Flex Layout
Angular Flex Layout slides for Angular Summit 2017
- 4,526