Notes/src/public/app/widgets/tab_row.js

import BasicWidget from "./basic_widget.js";
import contextMenu from "../services/context_menu.js";
import utils from "../services/utils.js";
import keyboardActionService from "../services/keyboard_actions.js";
import appContext from "../services/app_context.js";
import froca from "../services/froca.js";

/*!
 * Draggabilly v2.3.0
 * Make that shiz draggable
 * https://draggabilly.desandro.com
 * MIT license
 */
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const Draggabilly = window.Draggabilly;

const TAB_CONTAINER_MIN_WIDTH = 24;
const TAB_CONTAINER_MAX_WIDTH = 240;
const NEW_TAB_WIDTH = 32;
const MIN_FILLER_WIDTH = 50;

const TAB_SIZE_SMALL = 84;
const TAB_SIZE_SMALLER = 60;
const TAB_SIZE_MINI = 48;

const TAB_TPL = `
<div class="note-tab">
  <div class="note-tab-wrapper">
    <div class="note-tab-icon"></div>
    <div class="note-tab-title"></div>
    <div class="note-tab-drag-handle"></div>
    <div class="note-tab-close" title="Close tab" data-trigger-command="closeActiveTab"><span>×</span></div>
  </div>
</div>`;

const NEW_TAB_BUTTON_TPL = `<div class="note-new-tab" data-trigger-command="openNewTab" title="Add new tab">+</div>`;
const FILLER_TPL = `<div class="tab-row-filler">
    <div class="tab-row-border"></div>
</div>`;

const TAB_ROW_TPL = `
<div class="note-tab-row">
    <style>
    .note-tab-row {
        box-sizing: border-box;
        position: relative;
        height: 36px;
        width: 100%;
        background: var(--main-background-color);
        overflow: hidden;
        margin-top: 2px;
    }
    
    .note-tab-row * {
        box-sizing: inherit;
        font: inherit;
    }
    
    .note-tab-row .note-tab-row-container {
        box-sizing: border-box;
        position: relative;
        width: 100%;
        height: 100%;
    }
    
    .note-tab-row .note-tab {
        position: absolute;
        left: 0;
        height: 33px;
        width: 240px;
        border: 0;
        margin: 0;
        z-index: 1;
        pointer-events: none;
    }
    
    .note-new-tab {
        position: absolute;
        left: 0;
        height: 33px;
        width: 32px;
        border: 0;
        margin: 0;
        z-index: 1;
        text-align: center;
        font-size: 24px;
        cursor: pointer;
        border-bottom: 1px solid var(--main-border-color);
        box-sizing: border-box;
    }
    
    .note-new-tab:hover {
        background-color: var(--accented-background-color);
        border-radius: 5px;
    }
    
    .tab-row-filler {
        box-sizing: border-box;
        -webkit-app-region: drag;
        position: absolute;
        left: 0;
        height: 36px;
    }
    
    .tab-row-filler .tab-row-border {
        background: linear-gradient(to right, var(--main-border-color), transparent);
        height: 1px;
        margin-top: 32px;
    }
    
    .note-tab-row .note-tab[active] {
        z-index: 5;
    }
    
    .note-tab-row .note-tab,
    .note-tab-row .note-tab * {
        user-select: none;
        cursor: default;
    }
    
    .note-tab-row .note-tab.note-tab-was-just-added {
        top: 10px;
        animation: note-tab-was-just-added 120ms forwards ease-in-out;
    }
    
    .note-tab-row .note-tab .note-tab-wrapper {
        position: absolute;
        display: flex;
        top: 0;
        bottom: 0;
        left: 0;
        right: 0;
        padding: 5px 8px;
        border-top-left-radius: 8px;
        border-top-right-radius: 8px;
        overflow: hidden;
        pointer-events: all;
        background-color: var(--accented-background-color);
        border-bottom: 1px solid var(--main-border-color);
    }
    
    .note-tab-row .note-tab[active] .note-tab-wrapper {
        background-color: var(--main-background-color);
        border: 1px solid var(--main-border-color);
        border-bottom: 0;
        font-weight: bold;
    }
    
    .note-tab-row .note-tab[is-mini] .note-tab-wrapper {
        padding-left: 2px;
        padding-right: 2px;
    }
    
    .note-tab-row .note-tab .note-tab-title {
        flex: 1;
        vertical-align: top;
        overflow: hidden;
        white-space: nowrap;
        color: var(--muted-text-color);
    }
    
    .note-tab-row .note-tab .note-tab-icon {
        position: relative;
        top: -1px;
        padding-right: 3px;
    }
    
    .note-tab-row .note-tab[is-small] .note-tab-title {
        margin-left: 0;
    }
    
    .note-tab-row .note-tab[active] .note-tab-title {
        color: var(--main-text-color);
    }
    
    .note-tab-row .note-tab .note-tab-drag-handle {
        position: absolute;
        top: 0;
        bottom: 0;
        right: 0;
        left: 0;
        border-top-left-radius: 8px;
        border-top-right-radius: 8px;
    }
    
    .note-tab-row .note-tab .note-tab-close {
        flex-grow: 0;
        flex-shrink: 0;
        border-radius: 50%;
        z-index: 100;
        width: 24px;
        height: 24px;
        text-align: center;
    }
    
    .note-tab-row .note-tab .note-tab-close span {
        font-size: 24px;
        position: relative;
        top: -6px;
    }
    
    .note-tab-row .note-tab .note-tab-close:hover {
        background-color: var(--hover-item-background-color);
        color: var(--hover-item-text-color);
    }
    
    .note-tab-row .note-tab[is-smaller] .note-tab-close {
        margin-left: auto;
    }
    .note-tab-row .note-tab[is-mini]:not([active]) .note-tab-close {
        display: none;
    }
    .note-tab-row .note-tab[is-mini][active] .note-tab-close {
        margin-left: auto;
        margin-right: auto;
    }
    @-moz-keyframes note-tab-was-just-added {
        to {
            top: 0;
        }
    }
    @-webkit-keyframes note-tab-was-just-added {
        to {
            top: 0;
        }
    }
    @-o-keyframes note-tab-was-just-added {
        to {
            top: 0;
        }
    }
    @keyframes note-tab-was-just-added {
        to {
            top: 0;
        }
    }
    .note-tab-row.note-tab-row-is-sorting .note-tab:not(.note-tab-is-dragging),
    .note-tab-row:not(.note-tab-row-is-sorting) .note-tab.note-tab-was-just-dragged {
        transition: transform 120ms ease-in-out;
    }
    </style>

    <div class="note-tab-row-container"></div>
</div>`;

export default class TabRowWidget extends BasicWidget {
    doRender() {
        this.$widget = $(TAB_ROW_TPL);

        this.draggabillies = [];
        this.eventListeners = {};

        this.setupStyle();
        this.setupEvents();
        this.setupDraggabilly();
        this.setupNewButton();
        this.setupFiller();
        this.layoutTabs();
        this.setVisibility();

        this.$widget.on('contextmenu', '.note-tab', e => {
            e.preventDefault();

            const ntxId = $(e.target).closest(".note-tab").attr('data-tab-id');

            contextMenu.show({
                x: e.pageX,
                y: e.pageY,
                items: [
                    {title: "Move this tab to a new window", command: "moveTabToNewWindow", uiIcon: "window-open"},
                    {title: "Close all tabs", command: "removeAllTabs", uiIcon: "x"},
                    {title: "Close all tabs except for this", command: "removeAllTabsExceptForThis", uiIcon: "x"},
                ],
                selectMenuItemHandler: ({command}) => {
                    this.triggerCommand(command, {ntxId});
                }
            });
        });
    }

    setupStyle() {
        this.$style = $("<style>");
        this.$widget.append(this.$style);
    }

    setupEvents() {
        const resizeListener = _ => {
            this.cleanUpPreviouslyDraggedTabs();
            this.layoutTabs();
        };

        // ResizeObserver exists only in FF69
        if (typeof ResizeObserver !== "undefined") {
            new ResizeObserver(resizeListener).observe(this.$widget[0]);
        }
        else {
            // for older firefox
            window.addEventListener('resize', resizeListener);
        }

        this.tabEls.forEach((tabEl) => this.setTabCloseEvent(tabEl));
    }

    setVisibility() {
        this.$widget.show();
    }

    get tabEls() {
        return Array.prototype.slice.call(this.$widget.find('.note-tab'));
    }

    get $tabContainer() {
        return this.$widget.find('.note-tab-row-container');
    }

    get tabWidths() {
        const numberOfTabs = this.tabEls.length;
        const tabsContainerWidth = this.$tabContainer[0].clientWidth - NEW_TAB_WIDTH - MIN_FILLER_WIDTH;
        const targetWidth = tabsContainerWidth / numberOfTabs;
        const clampedTargetWidth = Math.max(TAB_CONTAINER_MIN_WIDTH, Math.min(TAB_CONTAINER_MAX_WIDTH, targetWidth));
        const flooredClampedTargetWidth = Math.floor(clampedTargetWidth);
        const totalTabsWidthUsingTarget = flooredClampedTargetWidth * numberOfTabs;
        const totalExtraWidthDueToFlooring = tabsContainerWidth - totalTabsWidthUsingTarget;

        const widths = [];
        let extraWidthRemaining = totalExtraWidthDueToFlooring;

        for (let i = 0; i < numberOfTabs; i += 1) {
            const extraWidth = flooredClampedTargetWidth < TAB_CONTAINER_MAX_WIDTH && extraWidthRemaining > 0 ? 1 : 0;
            widths.push(flooredClampedTargetWidth + extraWidth);
            if (extraWidthRemaining > 0) extraWidthRemaining -= 1;
        }

        if (this.$filler) {
            this.$filler.css("width", (extraWidthRemaining + MIN_FILLER_WIDTH) + "px");
        }

        return widths;
    }

    getTabPositions() {
        const tabPositions = [];

        let position = 0;
        this.tabWidths.forEach(width => {
            tabPositions.push(position);
            position += width;
        });

        const newTabPosition = position;
        const fillerPosition = position + 32;

        return {tabPositions, newTabPosition, fillerPosition};
    }

    layoutTabs() {
        const tabContainerWidths = this.tabWidths;

        this.tabEls.forEach((tabEl, i) => {
            const width = tabContainerWidths[i];

            tabEl.style.width = width + 'px';
            tabEl.removeAttribute('is-small');
            tabEl.removeAttribute('is-smaller');
            tabEl.removeAttribute('is-mini');

            if (width < TAB_SIZE_SMALL) tabEl.setAttribute('is-small', '');
            if (width < TAB_SIZE_SMALLER) tabEl.setAttribute('is-smaller', '');
            if (width < TAB_SIZE_MINI) tabEl.setAttribute('is-mini', '');
        });

        let styleHTML = '';

        const {tabPositions, newTabPosition, fillerPosition} = this.getTabPositions();

        tabPositions.forEach((position, i) => {
            styleHTML += `.note-tab:nth-child(${ i + 1 }) { transform: translate3d(${ position }px, 0, 0)} `;
        });

        styleHTML += `.note-new-tab { transform: translate3d(${ newTabPosition }px, 0, 0) } `;
        styleHTML += `.tab-row-filler { transform: translate3d(${ fillerPosition }px, 0, 0) } `;

        this.$style.html(styleHTML);
    }

    addTab(ntxId) {
        const $tab = $(TAB_TPL).attr('data-tab-id', ntxId);

        keyboardActionService.updateDisplayedShortcuts($tab);

        $tab.addClass('note-tab-was-just-added');

        setTimeout(() => $tab.removeClass('note-tab-was-just-added'), 500);

        this.$newTab.before($tab);
        this.setVisibility();
        this.setTabCloseEvent($tab);
        this.updateTitle($tab, 'New tab');
        this.cleanUpPreviouslyDraggedTabs();
        this.layoutTabs();
        this.setupDraggabilly();
    }

    closeActiveTabCommand({$el}) {
        const ntxId = $el.closest(".note-tab").attr('data-tab-id');

        appContext.tabManager.removeNoteContext(ntxId);
    }

    setTabCloseEvent($tab) {
        $tab.on('mousedown', e => {
            if (e.which === 2) {
                appContext.tabManager.removeNoteContext($tab.attr('data-tab-id'));

                return true; // event has been handled
            }
        });
    }

    get activeTabEl() {
        return this.$widget.find('.note-tab[active]')[0];
    }

    activeContextChangedEvent() {
        let activeNoteContext = appContext.tabManager.getActiveContext();

        if (!activeNoteContext) {
            return;
        }

        if (activeNoteContext.mainNtxId) {
            activeNoteContext = appContext.tabManager.getNoteContextById(activeNoteContext.mainNtxId);
        }

        const tabEl = this.getTabById(activeNoteContext.ntxId)[0];
        const activeTabEl = this.activeTabEl;
        if (activeTabEl === tabEl) return;
        if (activeTabEl) activeTabEl.removeAttribute('active');
        if (tabEl) tabEl.setAttribute('active', '');
    }

    newNoteContextCreatedEvent({noteContext}) {
        if (!noteContext.mainNtxId) {
            this.addTab(noteContext.ntxId);
        }
    }

    removeTab(ntxId) {
        const tabEl = this.getTabById(ntxId)[0];

        if (tabEl) {
            tabEl.parentNode.removeChild(tabEl);
            this.cleanUpPreviouslyDraggedTabs();
            this.layoutTabs();
            this.setupDraggabilly();
            this.setVisibility();
        }
    }

    getTabIdsInOrder() {
        return this.tabEls.map(el => el.getAttribute('data-tab-id'));
    }

    updateTitle($tab, title) {
        $tab.find('.note-tab-title').text(title);
    }

    getTabById(ntxId) {
        return this.$widget.find(`[data-tab-id='${ntxId}']`);
    }

    getTabId($tab) {
        return $tab.attr('data-tab-id');
    }

    noteContextRemovedEvent({ntxIds}) {
        for (const ntxId of ntxIds) {
            this.removeTab(ntxId);
        }
    }

    cleanUpPreviouslyDraggedTabs() {
        this.tabEls.forEach((tabEl) => tabEl.classList.remove('note-tab-was-just-dragged'));
    }

    setupDraggabilly() {
        const tabEls = this.tabEls;
        const {tabPositions} = this.getTabPositions();

        if (this.isDragging) {
            this.isDragging = false;
            this.$widget.removeClass('note-tab-row-is-sorting');
            this.draggabillyDragging.element.classList.remove('note-tab-is-dragging');
            this.draggabillyDragging.element.style.transform = '';
            this.draggabillyDragging.dragEnd();
            this.draggabillyDragging.isDragging = false;
            this.draggabillyDragging.positionDrag = _ => {}; // Prevent Draggabilly from updating tabEl.style.transform in later frames
            this.draggabillyDragging.destroy();
            this.draggabillyDragging = null;
        }

        this.draggabillies.forEach(d => d.destroy());

        tabEls.forEach((tabEl, originalIndex) => {
            const originalTabPositionX = tabPositions[originalIndex];
            const draggabilly = new Draggabilly(tabEl, {
                axis: 'x',
                handle: '.note-tab-drag-handle',
                containment: this.$tabContainer[0]
            });

            this.draggabillies.push(draggabilly);

            draggabilly.on('pointerDown', _ => {
                appContext.tabManager.activateNoteContext(tabEl.getAttribute('data-tab-id'));
            });

            draggabilly.on('dragStart', _ => {
                this.isDragging = true;
                this.draggabillyDragging = draggabilly;
                tabEl.classList.add('note-tab-is-dragging');
                this.$widget.addClass('note-tab-row-is-sorting');
            });

            draggabilly.on('dragEnd', _ => {
                this.isDragging = false;
                const finalTranslateX = parseFloat(tabEl.style.left, 10);
                tabEl.style.transform = `translate3d(0, 0, 0)`;

                // Animate dragged tab back into its place
                requestAnimationFrame(_ => {
                    tabEl.style.left = '0';
                    tabEl.style.transform = `translate3d(${ finalTranslateX }px, 0, 0)`;

                    requestAnimationFrame(_ => {
                        tabEl.classList.remove('note-tab-is-dragging');
                        this.$widget.removeClass('note-tab-row-is-sorting');

                        tabEl.classList.add('note-tab-was-just-dragged');

                        requestAnimationFrame(_ => {
                            tabEl.style.transform = '';

                            this.layoutTabs();
                            this.setupDraggabilly();
                        })
                    })
                })
            });

            draggabilly.on('dragMove', (event, pointer, moveVector) => {
                // Current index be computed within the event since it can change during the dragMove
                const tabEls = this.tabEls;
                const currentIndex = tabEls.indexOf(tabEl);

                const currentTabPositionX = originalTabPositionX + moveVector.x;
                const destinationIndexTarget = this.closest(currentTabPositionX, tabPositions);
                const destinationIndex = Math.max(0, Math.min(tabEls.length, destinationIndexTarget));

                if (currentIndex !== destinationIndex) {
                    this.animateTabMove(tabEl, currentIndex, destinationIndex);
                }

                if (Math.abs(moveVector.y) > 100) {
                    this.triggerCommand('moveTabToNewWindow', {ntxId: this.getTabId($(tabEl))});
                }
            });
        });
    }

    animateTabMove(tabEl, originIndex, destinationIndex) {
        if (destinationIndex < originIndex) {
            tabEl.parentNode.insertBefore(tabEl, this.tabEls[destinationIndex]);
        } else {
            const beforeEl = this.tabEls[destinationIndex + 1] || this.$newTab[0];

            tabEl.parentNode.insertBefore(tabEl, beforeEl);
        }
        this.triggerEvent('tabReorder', {ntxIdsInOrder: this.getTabIdsInOrder()});
        this.layoutTabs();
    }

    setupNewButton() {
        this.$newTab = $(NEW_TAB_BUTTON_TPL);

        this.$tabContainer.append(this.$newTab);
    }

    setupFiller() {
        this.$filler = $(FILLER_TPL);

        this.$tabContainer.append(this.$filler);
    }

    closest(value, array) {
        let closest = Infinity;
        let closestIndex = -1;

        array.forEach((v, i) => {
            if (Math.abs(value - v) < closest) {
                closest = Math.abs(value - v);
                closestIndex = i;
            }
        });

        return closestIndex;
    };

    noteSwitchedAndActivatedEvent({noteContext}) {
        this.activeContextChangedEvent();

        this.updateTabById(noteContext.mainNtxId || noteContext.ntxId);
    }

    noteSwitchedEvent({noteContext}) {
        this.updateTabById(noteContext.mainNtxId || noteContext.ntxId);
    }

    updateTabById(ntxId) {
        const $tab = this.getTabById(ntxId);

        const {note} = appContext.tabManager.getNoteContextById(ntxId);

        this.updateTab($tab, note);
    }

    updateTab($tab, note) {
        if (!$tab.length) {
            return;
        }

        for (const clazz of Array.from($tab[0].classList)) { // create copy to safely iterate over while removing classes
            if (clazz !== 'note-tab') {
                $tab.removeClass(clazz);
            }
        }

        const noteContext = appContext.tabManager.getNoteContextById(this.getTabId($tab));

        if (noteContext) {
            const hoistedNote = froca.getNoteFromCache(noteContext.hoistedNoteId);

            if (hoistedNote) {
                $tab.find('.note-tab-icon')
                    .removeClass()
                    .addClass("note-tab-icon")
                    .addClass(hoistedNote.getWorkspaceIconClass());

                $tab.find('.note-tab-wrapper').css("background", hoistedNote.getWorkspaceTabBackgroundColor());
            }
            else {
                $tab.find('.note-tab-wrapper').removeAttr("style");
            }
        }

        if (!note) {
            this.updateTitle($tab, 'New tab');
            return;
        }

        this.updateTitle($tab, note.title);

        $tab.addClass(note.getCssClass());
        $tab.addClass(utils.getNoteTypeClass(note.type));
        $tab.addClass(utils.getMimeTypeClass(note.mime));
    }

    async entitiesReloadedEvent({loadResults}) {
        for (const noteContext of appContext.tabManager.noteContexts) {
            if (!noteContext.noteId) {
                continue;
            }

            if (loadResults.isNoteReloaded(noteContext.noteId) ||
                loadResults.getAttributes().find(attr =>
                    ['workspace', 'workspaceIconClass', 'workspaceTabBackgroundColor'].includes(attr.name)
                    && attr.isAffecting(noteContext.note))
            ) {
                const $tab = this.getTabById(noteContext.ntxId);

                this.updateTab($tab, noteContext.note);
            }
        }
    }

    frocaReloadedEvent() {
        for (const noteContext of appContext.tabManager.noteContexts) {
            const $tab = this.getTabById(noteContext.ntxId);

            this.updateTab($tab, noteContext.note);
        }
    }

    hoistedNoteChangedEvent({ntxId}) {
        const $tab = this.getTabById(ntxId);

        if ($tab) {
            const noteContext = appContext.tabManager.getNoteContextById(ntxId);

            this.updateTab($tab, noteContext.note);
        }
    }
}