yomichan/ext/bg/js/search.js

/*
 * Copyright (C) 2016-2017  Alex Yatskov <alex@foosoft.net>
 * Author: Alex Yatskov <alex@foosoft.net>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */


class DisplaySearch extends Display {
    constructor() {
        super(document.querySelector('#spinner'), document.querySelector('#content'));

        this.optionsContext = {
            depth: 0,
            url: window.location.href
        };

        this.search = document.querySelector('#search');
        this.query = document.querySelector('#query');
        this.intro = document.querySelector('#intro');
        this.introVisible = true;
        this.introAnimationTimer = null;

        this.dependencies = Object.assign({}, this.dependencies, {docRangeFromPoint, docSentenceExtract});

        if (this.search !== null) {
            this.search.addEventListener('click', (e) => this.onSearch(e), false);
        }
        if (this.query !== null) {
            this.query.addEventListener('input', () => this.onSearchInput(), false);

            const query = DisplaySearch.getSearchQueryFromLocation(window.location.href);
            if (query !== null) {
                this.query.value = window.wanakana.toKana(query);
                this.onSearchQueryUpdated(query, false);
            }

            window.wanakana.bind(this.query);
        }

        this.updateSearchButton();
    }

    onError(error) {
        window.alert(`Error: ${error.toString ? error.toString() : error}`);
    }

    onSearchClear() {
        if (this.query === null) {
            return;
        }

        this.query.focus();
        this.query.select();
    }

    onSearchInput() {
        this.updateSearchButton();
    }

    onSearch(e) {
        if (this.query === null) {
            return;
        }

        e.preventDefault();

        const query = this.query.value;
        const queryString = query.length > 0 ? `?query=${encodeURIComponent(query)}` : '';
        window.history.replaceState(null, '', `${window.location.pathname}${queryString}`);
        this.onSearchQueryUpdated(query, true);
    }

    async onSearchQueryUpdated(query, animate) {
        try {
            const valid = (query.length > 0);
            this.setIntroVisible(!valid, animate);
            this.updateSearchButton();
            if (valid) {
                const {definitions} = await apiTermsFind(query, this.optionsContext);
                this.termsShow(definitions, await apiOptionsGet(this.optionsContext));
            } else {
                this.container.textContent = '';
            }
        } catch (e) {
            this.onError(e);
        }
    }

    setIntroVisible(visible, animate) {
        if (this.introVisible === visible) {
            return;
        }

        this.introVisible = visible;

        if (this.intro === null) {
            return;
        }

        if (this.introAnimationTimer !== null) {
            clearTimeout(this.introAnimationTimer);
            this.introAnimationTimer = null;
        }

        if (visible) {
            this.showIntro(animate);
        } else {
            this.hideIntro(animate);
        }
    }

    showIntro(animate) {
        if (animate) {
            const duration = 0.4;
            this.intro.style.transition = '';
            this.intro.style.height = '';
            const size = this.intro.getBoundingClientRect();
            this.intro.style.height = `0px`;
            this.intro.style.transition = `height ${duration}s ease-in-out 0s`;
            window.getComputedStyle(this.intro).getPropertyValue('height'); // Commits height so next line can start animation
            this.intro.style.height = `${size.height}px`;
            this.introAnimationTimer = setTimeout(() => {
                this.intro.style.height = '';
                this.introAnimationTimer = null;
            }, duration * 1000);
        } else {
            this.intro.style.transition = '';
            this.intro.style.height = '';
        }
    }

    hideIntro(animate) {
        if (animate) {
            const duration = 0.4;
            const size = this.intro.getBoundingClientRect();
            this.intro.style.height = `${size.height}px`;
            this.intro.style.transition = `height ${duration}s ease-in-out 0s`;
            window.getComputedStyle(this.intro).getPropertyValue('height'); // Commits height so next line can start animation
        } else {
            this.intro.style.transition = '';
        }
        this.intro.style.height = '0';
    }

    updateSearchButton() {
        this.search.disabled = this.introVisible && (this.query === null || this.query.value.length === 0);
    }

    static getSearchQueryFromLocation(url) {
        let match = /^[^\?#]*\?(?:[^&#]*&)?query=([^&#]*)/.exec(url);
        return match !== null ? decodeURIComponent(match[1]) : null;
    }
}

window.yomichan_search = new DisplaySearch();