76 lines
2.4 KiB
JavaScript
76 lines
2.4 KiB
JavaScript
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/*
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* ShrinkVertically -- optional click-and-drag horizontal scrolling of the board.
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*
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* Like the Trello board canvas: press the empty board background and drag left/right
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* to scroll #board-container horizontally. The pan only starts on empty background --
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* pressing a task card, a drag handle, or any interactive control is ignored, so this
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* never interferes with Kanboard's own card and column drag-and-drop.
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*
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* Loaded only when the "Drag the board background to scroll" setting is enabled.
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*/
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(function () {
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"use strict";
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// Pressing any of these (or their descendants) must NOT start a background pan.
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var IGNORE = "a, button, input, textarea, select, label, " +
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".task-board, [data-task-id], .task-board-sort-handle, " +
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".draggable-row-handle, .dropdown, .ui-sortable-handle";
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function isIgnored(el) {
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return !!(el && el.closest && el.closest(IGNORE));
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}
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function init() {
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var container = document.getElementById("board-container");
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if (!container || container.getAttribute("data-sv-drag") === "1") {
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return;
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}
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container.setAttribute("data-sv-drag", "1");
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container.classList.add("sv-drag-scroll");
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var dragging = false;
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var startX = 0;
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var startScrollLeft = 0;
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container.addEventListener("mousedown", function (e) {
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// Left button only, and only on empty board background.
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if (e.button !== 0 || isIgnored(e.target)) {
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return;
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}
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dragging = true;
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startX = e.clientX;
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startScrollLeft = container.scrollLeft;
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container.classList.add("sv-grabbing");
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e.preventDefault();
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});
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document.addEventListener("mousemove", function (e) {
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if (!dragging) {
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return;
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}
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container.scrollLeft = startScrollLeft - (e.clientX - startX);
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e.preventDefault();
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});
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function stop() {
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if (!dragging) {
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return;
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}
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dragging = false;
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container.classList.remove("sv-grabbing");
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}
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document.addEventListener("mouseup", stop);
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document.addEventListener("mouseleave", stop);
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}
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if (document.readyState === "loading") {
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document.addEventListener("DOMContentLoaded", init);
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} else {
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init();
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}
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})();
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