Ghost/ghost/admin/app/controllers/settings/design/change-theme.js

import Controller from '@ember/controller';
import {action} from '@ember/object';
import {inject as service} from '@ember/service';
import {tracked} from '@glimmer/tracking';

export default class ChangeThemeController extends Controller {
    @service router;
    @service store;
    @service themeManagement;

    @tracked showAdvanced = false;

    themes = this.store.peekAll('theme');

    officialThemes = [{
        name: 'Casper',
        category: 'Blog',
        previewUrl: 'https://demo.ghost.io/',
        ref: 'default',
        image: 'assets/img/themes/Casper.jpg'
    }, {
        name: 'Headline',
        category: 'News',
        url: 'https://github.com/TryGhost/Headline',
        previewUrl: 'https://headline.ghost.io',
        ref: 'TryGhost/Headline',
        image: 'assets/img/themes/Headline.jpg'
    }, {
        name: 'Edition',
        category: 'Newsletter',
        url: 'https://github.com/TryGhost/Edition',
        previewUrl: 'https://edition.ghost.io/',
        ref: 'TryGhost/Edition',
        image: 'assets/img/themes/Edition.png'
    }, {
        name: 'Solo',
        category: 'Blog',
        url: 'https://github.com/TryGhost/Solo',
        previewUrl: 'https://solo.ghost.io',
        ref: 'TryGhost/Solo',
        image: 'assets/img/themes/Solo.png'
    }, {
        name: 'Digest',
        category: 'Newsletter',
        url: 'https://github.com/TryGhost/Digest',
        previewUrl: 'https://digest.ghost.io/',
        ref: 'TryGhost/Digest',
        image: 'assets/img/themes/Digest.png'
    }, {
        name: 'Bulletin',
        category: 'Newsletter',
        url: 'https://github.com/TryGhost/Bulletin',
        previewUrl: 'https://bulletin.ghost.io/',
        ref: 'TryGhost/Bulletin',
        image: 'assets/img/themes/Bulletin.png'
    }, {
        name: 'Alto',
        category: 'Blog',
        url: 'https://github.com/TryGhost/Alto',
        previewUrl: 'https://alto.ghost.io',
        ref: 'TryGhost/Alto',
        image: 'assets/img/themes/Alto.png'
    }, {
        name: 'Dope',
        category: 'Magazine',
        url: 'https://github.com/TryGhost/Dope',
        previewUrl: 'https://dope.ghost.io',
        ref: 'TryGhost/Dope',
        image: 'assets/img/themes/Dope.png'
    }, {
        name: 'Wave',
        category: 'Podcast',
        url: 'https://github.com/TryGhost/Wave',
        previewUrl: 'https://wave.ghost.io',
        ref: 'TryGhost/Wave',
        image: 'assets/img/themes/Wave.png'
    }, {
        name: 'Edge',
        category: 'Photography',
        url: 'https://github.com/TryGhost/Edge',
        previewUrl: 'https://edge.ghost.io',
        ref: 'TryGhost/Edge',
        image: 'assets/img/themes/Edge.png'
    }, {
        name: 'Dawn',
        category: 'Newsletter',
        url: 'https://github.com/TryGhost/Dawn',
        previewUrl: 'https://dawn.ghost.io/',
        ref: 'TryGhost/Dawn',
        image: 'assets/img/themes/Dawn.png'
    }, {
        name: 'Ease',
        category: 'Documentation',
        url: 'https://github.com/TryGhost/Ease',
        previewUrl: 'https://ease.ghost.io',
        ref: 'TryGhost/Ease',
        image: 'assets/img/themes/Ease.png'
    }, {
        name: 'Ruby',
        category: 'Magazine',
        url: 'https://github.com/TryGhost/Ruby',
        previewUrl: 'https://ruby.ghost.io',
        ref: 'TryGhost/Ruby',
        image: 'assets/img/themes/Ruby.png'
    }, {
        name: 'London',
        category: 'Photography',
        url: 'https://github.com/TryGhost/London',
        previewUrl: 'https://london.ghost.io',
        ref: 'TryGhost/London',
        image: 'assets/img/themes/London.jpg'
    }, {
        name: 'Journal',
        category: 'Newsletter',
        url: 'https://github.com/TryGhost/Journal',
        previewUrl: 'https://journal.ghost.io/',
        ref: 'TryGhost/Journal',
        image: 'assets/img/themes/Journal.png'
    }];

    get themesList() {
        const activeTheme = this.themes.findBy('active', true);

        // decorate themes based on current usage
        let themesList = this.officialThemes.map((theme) => {
            const decoratedTheme = Object.assign({}, theme);

            if (theme.ref === 'default') {
                decoratedTheme.isDefault = true;
            }

            if (theme.name.toLowerCase() === activeTheme.name) {
                decoratedTheme.isActive = true;
            }

            return decoratedTheme;
        });

        // move default themes to the beginning of the list
        themesList.sort((a, b) => {
            if (b.isDefault) {
                return 1;
            }

            return 0;
        });

        // ensure active theme is always first
        const activeThemeInList = themesList.find(theme => theme.isActive);
        const activeThemeIndex = themesList.indexOf(activeThemeInList);
        if (activeThemeIndex > 0) {
            themesList.splice(activeThemeIndex, 1);
            themesList.unshift(activeThemeInList);
        }

        return themesList;
    }

    @action
    startThemeUpload(event) {
        event?.preventDefault();

        this.themeManagement.upload({
            onActivationSuccess: () => {
                this.router.transitionTo('settings.design');
            }
        });
    }

    @action
    toggleAdvanced(event) {
        this.showAdvanced = !this.showAdvanced;

        if (this.showAdvanced) {
            const mainContainer = event?.target.closest('.gh-main');

            if (mainContainer) {
                mainContainer.scrollTop = 0;
            }
        }
    }

    reset() {
        this.showAdvanced = false;
    }
}