trilium/src/public/javascripts/services/tab_row.js

/*!
 * Draggabilly PACKAGED v2.2.0
 * Make that shiz draggable
 * https://draggabilly.desandro.com
 * MIT license
 */

import BasicWidget from "../widgets/basic_widget.js";
import contextMenuService from "./context_menu.js";

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const Draggabilly = window.Draggabilly;

const TAB_CONTENT_MIN_WIDTH = 24;
const TAB_CONTENT_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 tabTemplate = `
<div class="note-tab">
  <div class="note-tab-wrapper">
    <div class="note-tab-title"></div>
    <div class="note-tab-drag-handle"></div>
    <div class="note-tab-close"><span>×</span></div>
  </div>
</div>`;

const newTabButtonTemplate = `<div class="note-new-tab" title="Add new tab">+</div>`;
const fillerTemplate = `<div class="tab-row-filler">
    <div class="tab-row-border"></div>
</div>`;

const TPL = `
<div class="note-tab-row">
    <div class="note-tab-row-content"></div>
</div>`;

export default class TabRowWidget extends BasicWidget {
    async doRender($widget) {
        $widget.append($(TPL));

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

        this.el = $widget.find(".note-tab-row")[0];

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

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

            const tab = $(e.target).closest(".note-tab");

            contextMenuService.initContextMenu(e, {
                getContextMenuItems: () => {
                    return [
                        {title: "Close all tabs", cmd: "removeAllTabs", uiIcon: "empty"},
                        {title: "Close all tabs except for this", cmd: "removeAllTabsExceptForThis", uiIcon: "empty"}
                    ];
                },
                selectContextMenuItem: (e, cmd) => {
                    if (cmd === 'removeAllTabs') {
                        this.removeAllTabs();
                    } else if (cmd === 'removeAllTabsExceptForThis') {
                        this.removeAllTabsExceptForThis(tab[0]);
                    }
                }
            });
        })
    }

    setupStyleEl() {
        this.styleEl = document.createElement('style');
        this.el.appendChild(this.styleEl);
    }

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

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

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

    setVisibility() {
        this.el.style.display = "block";
    }

    get tabEls() {
        return Array.prototype.slice.call(this.el.querySelectorAll('.note-tab'));
    }

    get tabContentEl() {
        return this.el.querySelector('.note-tab-row-content');
    }

    get tabContentWidths() {
        const numberOfTabs = this.tabEls.length;
        const tabsContentWidth = this.tabContentEl.clientWidth - NEW_TAB_WIDTH - MIN_FILLER_WIDTH;
        const targetWidth = tabsContentWidth / numberOfTabs;
        const clampedTargetWidth = Math.max(TAB_CONTENT_MIN_WIDTH, Math.min(TAB_CONTENT_MAX_WIDTH, targetWidth));
        const flooredClampedTargetWidth = Math.floor(clampedTargetWidth);
        const totalTabsWidthUsingTarget = flooredClampedTargetWidth * numberOfTabs;
        const totalExtraWidthDueToFlooring = tabsContentWidth - totalTabsWidthUsingTarget;

        const widths = [];
        let extraWidthRemaining = totalExtraWidthDueToFlooring;

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

        if (this.fillerEl) {
            this.fillerEl.style.width = (extraWidthRemaining + MIN_FILLER_WIDTH) + "px";
        }

        return widths;
    }

    getTabPositions() {
        const tabPositions = [];
        const tabContentWidths = this.tabContentWidths;

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

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

        return {tabPositions, newTabPosition, fillerPosition};
    }

    layoutTabs() {
        const tabContentWidths = this.tabContentWidths;

        this.tabEls.forEach((tabEl, i) => {
            const width = tabContentWidths[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.styleEl.innerHTML = styleHTML;
    }

    addTab(tabId) {
        const div = document.createElement('div');
        div.innerHTML = tabTemplate;
        const tabEl = div.firstElementChild;
        tabEl.setAttribute('data-tab-id', tabId);

        tabEl.classList.add('note-tab-was-just-added');
        setTimeout(() => tabEl.classList.remove('note-tab-was-just-added'), 500);

        this.newTabEl.before(tabEl);
        this.setVisibility();
        this.setTabCloseEventListener(tabEl);
        this.updateTab(tabEl, {title: 'New tab'});
        this.cleanUpPreviouslyDraggedTabs();
        this.layoutTabs();
        this.setupDraggabilly();

        return tabEl;
    }

    setTabCloseEventListener(tabEl) {
        tabEl.querySelector('.note-tab-close').addEventListener('click', _ => this.removeTab(tabEl));

        tabEl.addEventListener('mousedown', e => {
            if (e.which === 2) {
                this.removeTab(tabEl);

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

    get activeTabEl() {
        return this.el.querySelector('.note-tab[active]');
    }

    get previousTabEl() {
        const tabEls = this.tabEls;

        if (tabEls.length <= 1) {
            return null;
        }

        let prev = tabEls[tabEls.length - 1];

        for (const tabEl of tabEls) {
            if (tabEl.hasAttribute("active")) {
                return prev;
            }

            prev = tabEl;
        }

        return null;
    }

    get nextTabEl() {
        const tabEls = this.tabEls;

        if (tabEls.length <= 1) {
            return null;
        }

        let prev = tabEls[tabEls.length - 1];

        for (const tabEl of tabEls) {
            if (prev.hasAttribute("active")) {
                return tabEl;
            }

            prev = tabEl;
        }

        return null;
    }

    hasActiveTab() {
        return !!this.activeTabEl;
    }

    async activateTab(tabEl) {
        const activeTabEl = this.activeTabEl;
        if (activeTabEl === tabEl) return;
        if (activeTabEl) activeTabEl.removeAttribute('active');
        tabEl.setAttribute('active', '');
        await this.trigger('activeTabChanged', { tabEl });
    }

    async removeTab(tabEl) {
        if (tabEl === this.activeTabEl) {
            if (tabEl.nextElementSibling && tabEl.nextElementSibling.classList.contains("note-tab")) {
                await this.activateTab(tabEl.nextElementSibling)
            } else if (tabEl.previousElementSibling && tabEl.previousElementSibling.classList.contains("note-tab")) {
                await this.activateTab(tabEl.previousElementSibling)
            }
        }
        tabEl.parentNode.removeChild(tabEl);
        await this.trigger('tabRemove', { tabEl });
        this.cleanUpPreviouslyDraggedTabs();
        this.layoutTabs();
        this.setupDraggabilly();
        this.setVisibility();
    }

    async removeAllTabs() {
        for (const tabEl of this.tabEls) {
            await this.removeTab(tabEl);
        }
    }

    async removeAllTabsExceptForThis(remainingTabEl) {
        for (const tabEl of this.tabEls) {
            if (remainingTabEl !== tabEl) {
                await this.removeTab(tabEl);
            }
        }
    }

    updateTab(tabEl, tabProperties) {
        tabEl.querySelector('.note-tab-title').textContent = tabProperties.title;
    }

    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.el.classList.remove('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.tabContentEl
            });

            this.draggabillies.push(draggabilly);

            draggabilly.on('pointerDown', _ => {
                this.activateTab(tabEl)
            });

            draggabilly.on('dragStart', _ => {
                this.isDragging = true;
                this.draggabillyDragging = draggabilly;
                tabEl.classList.add('note-tab-is-dragging');
                this.el.classList.add('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.el.classList.remove('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);
                }
            })
        })
    }

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

            tabEl.parentNode.insertBefore(tabEl, beforeEl);
        }
        await this.trigger('tabReorder', { tabEl, originIndex, destinationIndex });
        this.layoutTabs();
    }

    setupNewButton() {
        const div = document.createElement('div');
        div.innerHTML = newTabButtonTemplate;
        this.newTabEl = div.firstElementChild;

        this.tabContentEl.appendChild(this.newTabEl);

        this.newTabEl.addEventListener('click', _ => this.trigger('newTab'));
    }

    setupFiller() {
        const div = document.createElement('div');
        div.innerHTML = fillerTemplate;
        this.fillerEl = div.firstElementChild;

        this.tabContentEl.appendChild(this.fillerEl);
    }

    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;
    };
}