We are excited to announce that the alpha version of the LeptonX theme has been released! As stated in this blog post, LeptonX comes in different shapes. For this release, we introduce only ABP based projects with the Angular UI. So, if you are already using the ABP Framework and Angular as the frontend choice, you can integrate these packages into your project today.

The theme has been deployed with two versions: LeptonX-lite (free) and LeptonX (commercial).

Note that this theme currently only works for the Angular UI. Please keep waiting for other UI options.

Open-Source

This section shows how to replace the basic theme (that comes with open source ABP Framework startup template) with the new LeptonX-lite theme.

To add LeptonX-lite into your project,

• Install @abp/ng.theme.lepton-x NPM package

npm install @abp/ng.theme.lepton-x@preview or

yarn add @abp/ng.theme.lepton-x@preview

• Then, we need to edit the styles array in angular.json to replace the existing style with the new one.

Replace the following style

{
  "input": "node_modules/bootstrap/dist/css/bootstrap.min.css",
  "inject": true,
  "bundleName": "bootstrap-ltr.min"
},

with

"node_modules/@volo/ngx-lepton-x.lite/styles/sidemenu-layout.min.css",
"node_modules/bootstrap-icons/font/bootstrap-icons.css",

• Finally, remove ThemeBasicModule from app.module.ts and shared.module.ts, and import the related modules in app.module.ts

import { ThemeLeptonXModule } from '@abp/ng.theme.lepton-x';
import { SideMenuLayoutModule } from '@abp/ng.theme.lepton-x/layouts';

@NgModule({
  imports: [
    // ...
    ThemeLeptonXModule.forRoot(),
    SideMenuLayoutModule.forRoot(),
  ],
  // ...
})
export class AppModule {}

Note: If you employ Resource Owner Password Flow for authorization, you should import the following module as well:

import { AccountLayoutModule } from '@abp/ng.theme.lepton-x/account';

@NgModule({
  // ...
  imports: [
    // ...
    AccountLayoutModule.forRoot(),
    // ...
  ],
  // ...
})
export class AppModule {}

To change the logos and brand color of the LeptonX, simply add the following CSS to the styles.scss

:root {
  --lpx-logo: url('/assets/images/logo.png');
  --lpx-logo-icon: url('/assets/images/logo-icon.png');
  --lpx-brand: #edae53;
}

• --lpx-logo is used to place the logo in the menu.
• --lpx-logo-icon is a square icon used when the menu is collapsed.
• --lpx-brand is a color used throughout the application, especially on active elements.

ABP Commercial

This section shows how to replace the lepton theme (that comes with the ABP Commercial startup template) with the new LeptonX theme.

To add LeptonX into your existing projects,

• Firstly, install @volosoft/abp.ng.theme.lepton-x NPM package

npm install @volosoft/abp.ng.theme.lepton-x@preview or

yarn add @volosoft/abp.ng.theme.lepton-x@preview

• Then, edit angular.json as follows:

Remove the following config from the styles array since LeptonX provides bootstrap as embedded in its CSS.

{
  "input": "node_modules/bootstrap/dist/css/bootstrap.min.css",
  "inject": true,
  "bundleName": "bootstrap-ltr.min"
},

Add the following ones into the styles array

{
  "input": "node_modules/@volosoft/ngx-lepton-x/styles/themes/dark.css",
  "inject": false,
  "bundleName": "lepton-x.dark"
},
{
  "input": "node_modules/@volosoft/ngx-lepton-x/styles/themes/dim.css",
  "inject": false,
  "bundleName": "lepton-x.dim"
},
{
  "input": "node_modules/@volosoft/ngx-lepton-x/styles/themes/light.css",
  "inject": false,
  "bundleName": "lepton-x.light"
},
"node_modules/@volosoft/ngx-lepton-x/styles/css/sidemenu-layout.min.css",
"node_modules/bootstrap-icons/font/bootstrap-icons.css",

Three of them are related to the theming and will be loaded during runtime. That's why they are not injected into the head as a style. Hence, the "inject": false

The fourth one depends on which layout you want to use. For now, there is only sidemenu-layout available. In the future, there will be many layouts to choose from.

The last one is bootstrap-icons which are being used throughout the components.

• At last, remove ThemeLeptonModule from app.module.ts and shared.module.ts, and import the following modules in app.module.ts

import { ThemeLeptonXModule } from '@volosoft/abp.ng.theme.lepton-x';
import { AbpSideMenuLayoutModule } from '@volosoft/abp.ng.theme.lepton-x/layouts';

@NgModule({
  // ...
  imports: [
    // ...
    ThemeLeptonXModule.forRoot(),
    AbpSideMenuLayoutModule.forRoot(), // depends on which layout you choose
    // ...
  ],
  // ...
})
export class AppModule {}

Note: If you employ Resource Owner Password Flow for authorization, you should import the following module as well:

import { AccountLayoutModule } from '@volosoft/abp.ng.theme.lepton-x/account';

@NgModule({
  // ...
  imports: [
    // ...
    AccountLayoutModule.forRoot({
      layout: {
        authLayoutImg: '/assets/images/login-bg.jpg',
      },
    }),
    // ...
  ],
  // ...
})
export class AppModule {}

authLayoutImg: (Optional) If not given, a default image will be placed on the authentication pages.

• At this point, LeptonX theme should be up and running within your application. However, you may need to overwrite some css variables based your needs for every theme available as follows:

:root {
  .lpx-theme-dark {
    --lpx-logo: url('/assets/images/logo/logo-light.svg');
    --lpx-logo-icon: url('/assets/images/logo/logo-light-icon.svg');
    --lpx-brand: #edae53;
  }

  .lpx-theme-dim {
    --lpx-logo: url('/assets/images/logo/logo-light.svg');
    --lpx-logo-icon: url('/assets/images/logo/logo-light-icon.svg');
    --lpx-brand: #f15835;
  }

  .lpx-theme-light {
    --lpx-logo: url('/assets/images/logo/logo-dark.svg');
    --lpx-logo-icon: url('/assets/images/logo/logo-dark-icon.svg');
    --lpx-brand: #69aada;
  }
}

When the user selects a theme, the corresponding CSS class is added to the body, so you can write specific CSS rules to each theme.

Conclusion

In this blog post, I've explained how to use the alpha version of the new LeptonX theme for ABP-based solutions. Please, keep in mind that this is an alpha version, and we will continue to work on the LeptonX theme. The APIs are bound to change and breaking changes may be introduced in future versions.

We would like you to try it out with the latest version of the ABP Framework and give us feedback at lepton@volosoft.com or open an issue on this repository: https://github.com/volosoft/lepton-theme