trilium/libraries/chrome-tabs/chrome-tabs.js

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

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(function(){
  const Draggabilly = window.Draggabilly;

  const TAB_CONTENT_MARGIN = 0;
  const TAB_CONTENT_OVERLAP_DISTANCE = 1;

  const TAB_CONTENT_MIN_WIDTH = 24;
  const TAB_CONTENT_MAX_WIDTH = 240;

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

  const noop = _ => {};

  const 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;
  };

  const tabTemplate = `
    <div class="chrome-tab">
      <div class="chrome-tab-content">
        <div class="chrome-tab-title"></div>
        <div class="chrome-tab-drag-handle"></div>
        <div class="chrome-tab-close"><span>×</span></div>
      </div>
    </div>
  `;

  const defaultTapProperties = {
    title: 'New tab'
  };

  let instanceId = 0;

  class ChromeTabs {
    constructor() {
      this.draggabillies = []
    }

    init(el) {
      this.el = el;

      this.instanceId = instanceId;
      this.el.setAttribute('data-chrome-tabs-instance-id', this.instanceId);
      instanceId += 1;

      this.setupCustomProperties();
      this.setupStyleEl();
      this.setupEvents();
      this.layoutTabs();
      this.setupDraggabilly();
      this.setVisibility();
    }

    emit(eventName, data) {
      this.el.dispatchEvent(new CustomEvent(eventName, { detail: data }));
    }

    setupCustomProperties() {
      this.el.style.setProperty('--tab-content-margin', `${ TAB_CONTENT_MARGIN }px`);
    }

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

    setupEvents() {
      window.addEventListener('resize', _ => {
        this.cleanUpPreviouslyDraggedTabs();
        this.layoutTabs();
      });

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

    setVisibility() {
      this.el.style.display = this.tabEls.length > 1 ? "block" : "none";
    }

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

    get tabContentEl() {
      return this.el.querySelector('.chrome-tabs-content');
    }

    get tabContentWidths() {
      const numberOfTabs = this.tabEls.length;
      const tabsContentWidth = this.tabContentEl.clientWidth;
      const tabsCumulativeOverlappedWidth = (numberOfTabs - 1) * TAB_CONTENT_OVERLAP_DISTANCE;
      const targetWidth = (tabsContentWidth - (2 * TAB_CONTENT_MARGIN) + tabsCumulativeOverlappedWidth) / 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) + (2 * TAB_CONTENT_MARGIN) - tabsCumulativeOverlappedWidth;
      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;
      }

      return widths
    }

    get tabContentPositions() {
      const positions = [];
      const tabContentWidths = this.tabContentWidths;

      let position = TAB_CONTENT_MARGIN;
      tabContentWidths.forEach((width, i) => {
        const offset = i * TAB_CONTENT_OVERLAP_DISTANCE;
        positions.push(position - offset);
        position += width;
      });

      return positions;
    }

    get tabPositions() {
      const positions = [];

      this.tabContentPositions.forEach((contentPosition) => {
        positions.push(contentPosition - TAB_CONTENT_MARGIN);
      });

      return positions;
    }

    layoutTabs() {
      const tabContentWidths = this.tabContentWidths;

      this.tabEls.forEach((tabEl, i) => {
        const contentWidth = tabContentWidths[i];
        const width = contentWidth + (2 * TAB_CONTENT_MARGIN);

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

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

      let styleHTML = '';
      this.tabPositions.forEach((position, i) => {
        styleHTML += `
          .chrome-tabs[data-chrome-tabs-instance-id="${ this.instanceId }"] .chrome-tab:nth-child(${ i + 1 }) {
            transform: translate3d(${ position }px, 0, 0)
          }
        `
      });

      this.styleEl.innerHTML = styleHTML;
    }

    addTab(tabProperties, { animate = true, background = false } = {}) {
      const div = document.createElement('div');
      div.innerHTML = tabTemplate;
      const tabEl = div.firstElementChild;

      if (animate) {
        tabEl.classList.add('chrome-tab-was-just-added');
        setTimeout(() => tabEl.classList.remove('chrome-tab-was-just-added'), 500);
      }

      tabProperties = Object.assign({}, defaultTapProperties, tabProperties);
      this.tabContentEl.appendChild(tabEl);
      this.setVisibility();
      this.setTabCloseEventListener(tabEl);
      this.updateTab(tabEl, tabProperties);
      this.emit('tabAdd', { tabEl });
      if (!background) this.setCurrentTab(tabEl);
      this.cleanUpPreviouslyDraggedTabs();
      this.layoutTabs();
      this.setupDraggabilly();

      return tabEl;
    }

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

    get activeTabEl() {
      return this.el.querySelector('.chrome-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;
    }

    setCurrentTab(tabEl) {
      const activeTabEl = this.activeTabEl;
      if (activeTabEl === tabEl) return;
      if (activeTabEl) activeTabEl.removeAttribute('active');
      tabEl.setAttribute('active', '');
      this.emit('activeTabChange', { tabEl });
    }

    removeTab(tabEl) {
      if (tabEl === this.activeTabEl) {
        if (tabEl.nextElementSibling) {
          this.setCurrentTab(tabEl.nextElementSibling)
        } else if (tabEl.previousElementSibling) {
          this.setCurrentTab(tabEl.previousElementSibling)
        }
      }
      tabEl.parentNode.removeChild(tabEl);
      this.emit('tabRemove', { tabEl });
      this.cleanUpPreviouslyDraggedTabs();
      this.layoutTabs();
      this.setupDraggabilly();
      this.setVisibility();
    }

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

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

      if (tabProperties.id) {
        tabEl.setAttribute('data-tab-id', tabProperties.id);
      }
    }

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

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

      if (this.isDragging) {
        this.isDragging = false;
        this.el.classList.remove('chrome-tabs-is-sorting');
        this.draggabillyDragging.element.classList.remove('chrome-tab-is-dragging');
        this.draggabillyDragging.element.style.transform = '';
        this.draggabillyDragging.dragEnd();
        this.draggabillyDragging.isDragging = false;
        this.draggabillyDragging.positionDrag = noop; // 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: '.chrome-tab-drag-handle',
          containment: this.tabContentEl
        });

        this.draggabillies.push(draggabilly);

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

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

              tabEl.classList.add('chrome-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 = closest(currentTabPositionX, tabPositions);
          const destinationIndex = Math.max(0, Math.min(tabEls.length, destinationIndexTarget));

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

    animateTabMove(tabEl, originIndex, destinationIndex) {
      if (destinationIndex < originIndex) {
        tabEl.parentNode.insertBefore(tabEl, this.tabEls[destinationIndex]);
      } else {
        tabEl.parentNode.insertBefore(tabEl, this.tabEls[destinationIndex + 1]);
      }
      this.emit('tabReorder', { tabEl, originIndex, destinationIndex });
      this.layoutTabs();
    }
  }

  window.ChromeTabs = ChromeTabs;
})();