ngx-cbp-theme

Angular native artifacts for consuming CBP Theme for Angular 6.x applications.

Goals

Provides abstraction for CBP Theme so that other Angular CBP applications do not have to repeat this gap-bridging between CBP Theme and Angular Material.
Deliver styling from CBP Theme to other CBP Angular applications so that CBP Theme can evolve and styling changes are delivered with simple upgrade in most cases.
Provides for progression from Bootstrap to Material specifications as CBP Theme evolves. (This should cause shrinking of this library.)

Target Applications

Apps that must comply with US CBP Style Guide
Apps that are using Angular ~6
Apps that will use Angular Material Angular/Material
Apps that use SCSS.

Library Development Goals and Guidelines

Consumption of this library should require minimal setup i.e. most complexity and difficulties must be fought and absorbed in here keeping angular-cli spirit.
Must inherit certain (see styles below) styles from US-CBP/cbp-theme
Must not mix any other UI libraries than Angular/Material
Expose SCSS artifacts.
Provide angular native components only when styling overriding is not an option OR consuming a material component requires more effort to comply with CBP Style Guide.
Provide angular native component ony when Angular/Material does not have equivalent component.
Styles
- Styles should be prefixed with cbp and mat when overriding.
- Markups should not use any other namespaces than the ones specified.
- Must expose individual styles for further customization.

Getting Started - How To Use

Note: For Windows users we recommend git-bash shell. Also check the node engine version.

Use @angular/cli global install version matching the version inside package.json

Install angular-cli globally making sure we use same version as we have in @angular/cli inside package.json.

Quick Start

For Quick Start up you could just clone my-app and npm install however we recommend you to understand what is happening in here and follow the following steps.

Start From Scratch

For new apps follow angular-cli and create your application with styles = SCSS. Minimal e.g.
```
ng new my-app --style scss --skip-install
```
Ensure polyfills.ts is correct by following instructions in your src/polyfills.ts to enable all IE11 and web-animations-js polyfills.
Ensure that you have exact version matches as per package.json. This is because angular-cli has more relaxed versioning scheme which promotes early adoption which can be problematic with Material/RxJS/angular-flex combination.

Install Material, CDK, FlexLayout

$ npm install @angular/material@~6  @angular/cdk@^6 --save

Ensure that it builds and runs correctly i.e. ng start runs fine.
Stop any of running processes/scripts against your project and then run:
```
$ npm install ngx-cbp-theme --save
```

In your styles.scss add

@import '~ngx-cbp-theme/styles/ngx-cbp-theme';

Implement required services:

ngx-cbp-theme requires implementation of some services provided by the consuming application since those services are beyond the scope of theme.

Ideally these will be provided by other projects hosted in the enterprise. Please check common framework team or other Angular teams withing CBP.

However for the sake of this exercise we will provide implementation of some of these services (CBPUserService, CBPApplicationsService) before we start our application.

Since this is just a guide we will create my-user.service (to fake User) and my-applications.service (to fake basic set of applications for header menu).

Lets go ahead and create those using angular-cli.
```
ng g s my-user
ng g s my-applications
```
Modify MyUserService to implement CBPUserService from ngx-cbp-theme. Make sure we implement all the abstract methods.

Similarly MyApplicationsService must implement CBPApplicationsService and its methods.

Both class declaration signature looks as below (implementation omitted for brevity).
```
// inside my-user-service.ts
import {CBPUserService, CBPUser} from 'ngx-cbp-theme';
@Injectable()
export class MyUserService extends CBPUserService { 
...
}
// inside my-applications-service.ts

import {CBPApplicationsService} from 'ngx-cbp-theme';
@Injectable()
export class MyApplicationsService extends CBPApplicationsService { 
...
```

Import following minimal modules in your AppModule (app.module.ts):

import {
    CBPRootModule, 
    CBPHeaderModule, 
    CBPAppHeaderModule,     // this is optional 
    CBP_USER_SERVICE,           // must be provided to fetch CBP user logged in to display user name on CBP Header
    CBP_APPLICATIONS_SERVICE    // must be provided to get CBP applications (recent) for Applications menu on the CBP Header
} from 'ngx-cbp-theme' ;

Import in @NgModule

  imports: [
      BrowserModule,
      CBPRootModule,
      CBPAppHeaderModule
    ],

Provide implementation for these services like USER_SERVICE and APPLICATIONS_SERVICE by implementing respective interfaces and declare providers in AppModule's @NgModule as follows:-

  providers: [
    { provide: CBP_USER_SERVICE,          useClass: MyUserService },
    { provide: CBP_APPLICATIONS_SERVICE,  useClass: MyApplicationsService }
  ]

Full code is available here in another github repo my-app. Checkout the progression by loking at the commit history as these steps.

Markup Requirement

Your app.component.html should be changed to following minimal structure:-

<cbp-root layout="'fluid'">
  <cbp-header></cbp-header>
  <cbp-app-header>
    <cbp-app-title>
      <h1 class="app-title"> Product<small> create</small></h1>
    </cbp-app-title>
  </cbp-app-header>
  <div class="app-content">
    <p>My markup here...</p>
  </div>
</cbp-root>

Customizing

Customizable cbp-header:- e.g. shows cbpAppsMenuExclude is excluded, cbp-feedback-link has custom action, cbp-user-menu has additional menu item Preference.

     <cbp-header [cbpAppsMenuExclude]="true">
         <cbp-feedback-link (click)="myFeedbackAction()"></cbp-feedback-link>
         <cbp-user-menu>
             <div class="mat-menu-item" (click)="myPreferences()" cbp-user-menu-item>Preferences</div>
         </cbp-user-menu>
     </cbp-header>

Contributing

We welcome contributions, please see our Contribution Policy

To get started developing, see contributing readme here.

License

Please refer to CBP Open Source License

yogeshgadge/ngx-cbp-theme