node-red/packages/node_modules/@node-red/editor-client/src/js/ui/contextMenu.js

RED.contextMenu = (function () {

    let menu;

    function disposeMenu() {
        $(document).off("mousedown.red-ui-workspace-context-menu");
        if (menu) {
            menu.remove();
        }
        menu = null;
    }
    function show(options) {
        if (menu) {
            menu.remove()
        }
        let menuItems = []
        if (options.options) {
            menuItems = options.options
        } else if (options.type === 'workspace') {
            const selection = RED.view.selection()
            const noSelection = !selection || Object.keys(selection).length === 0
            const hasSelection = (selection.nodes && selection.nodes.length > 0);
            const hasMultipleSelection = hasSelection && selection.nodes.length > 1;
            const virtulLinks = (selection.links && selection.links.filter(e => !!e.link)) || [];
            const wireLinks = (selection.links && selection.links.filter(e => !e.link)) || [];
            const hasLinks = wireLinks.length > 0;
            const isSingleLink = !hasSelection && hasLinks && wireLinks.length === 1
            const isMultipleLinks = !hasSelection && hasLinks && wireLinks.length > 1
            const canDelete = hasSelection || hasLinks
            const isGroup = hasSelection && selection.nodes.length === 1 && selection.nodes[0].type === 'group'

            const canRemoveFromGroup = hasSelection && !!selection.nodes[0].g
            const offset = $("#red-ui-workspace-chart").offset()

            let addX = options.x - offset.left + $("#red-ui-workspace-chart").scrollLeft()
            let addY = options.y - offset.top + $("#red-ui-workspace-chart").scrollTop()

            if (RED.view.snapGrid) {
                const gridSize = RED.view.gridSize()
                addX = gridSize * Math.floor(addX / gridSize)
                addY = gridSize * Math.floor(addY / gridSize)
            }

            menuItems.push(
                { onselect: 'core:show-action-list', onpostselect: function () { } },
                {
                    label: RED._("contextMenu.insert"),
                    options: [
                        {
                            label: RED._("contextMenu.node"),
                            onselect: function () {
                                RED.view.showQuickAddDialog({
                                    position: [addX, addY],
                                    touchTrigger: true,
                                    splice: isSingleLink ? selection.links[0] : undefined,
                                    // spliceMultiple: isMultipleLinks
                                })
                            }
                        },
                        (hasLinks) ? { // has least 1 wire selected
                            label: RED._("contextMenu.junction"),
                            onselect: 'core:split-wires-with-junctions',
                            disabled: !hasLinks
                        } : {
                            label: RED._("contextMenu.junction"),
                            onselect: function () {
                                const nn = {
                                    _def: { defaults: {} },
                                    type: 'junction',
                                    z: RED.workspaces.active(),
                                    id: RED.nodes.id(),
                                    x: addX,
                                    y: addY,
                                    w: 0, h: 0,
                                    outputs: 1,
                                    inputs: 1,
                                    dirty: true
                                }
                                const historyEvent = {
                                    dirty: RED.nodes.dirty(),
                                    t: 'add',
                                    junctions: [nn]
                                }
                                RED.nodes.addJunction(nn);
                                RED.history.push(historyEvent);
                                RED.nodes.dirty(true);
                                RED.view.select({nodes: [nn] });
                                RED.view.redraw(true)
                            }
                        },
                        {
                            label: RED._("contextMenu.linkNodes"),
                            onselect: 'core:split-wire-with-link-nodes',
                            disabled: !hasLinks
                        }
                    ]



                }
            )

            menuItems.push(
                null,
                { onselect: 'core:undo', disabled: RED.history.list().length === 0 },
                { onselect: 'core:redo', disabled: RED.history.listRedo().length === 0 },
                null,
                { onselect: 'core:cut-selection-to-internal-clipboard', label: RED._("keyboard.cutNode"), disabled: !hasSelection },
                { onselect: 'core:copy-selection-to-internal-clipboard', label: RED._("keyboard.copyNode"), disabled: !hasSelection },
                { onselect: 'core:paste-from-internal-clipboard', label: RED._("keyboard.pasteNode"), disabled: !RED.view.clipboard() },
                { onselect: 'core:delete-selection', disabled: !canDelete },
                { onselect: 'core:show-export-dialog', label: RED._("menu.label.export") },
                { onselect: 'core:select-all-nodes' }
            )

            if (hasSelection) {
                menuItems.push(
                    null,
                    isGroup ?
                        { onselect: 'core:ungroup-selection', disabled: !isGroup }
                        : { onselect: 'core:group-selection', disabled: !hasSelection }
                )
                if (canRemoveFromGroup) {
                    menuItems.push({ onselect: 'core:remove-selection-from-group', label: RED._("menu.label.groupRemoveSelection") })
                }

            }
        }

        var direction = "right";
        var MENU_WIDTH = 500; // can not use menu width here
        if ((options.x -$(document).scrollLeft()) >
            ($(window).width() -MENU_WIDTH)) {
            direction = "left";
        }

        menu = RED.menu.init({
            direction: direction,
            onpreselect: function() {
                disposeMenu()
            },
            onpostselect: function () {
                RED.view.focus()
            },
            options: menuItems
        });

        menu.attr("id", "red-ui-workspace-context-menu");
        menu.css({
            position: "absolute"
        })
        menu.appendTo("body");

        // TODO: prevent the menu from overflowing the window.

        var top = options.y
        var left = options.x

        if (top + menu.height() - $(document).scrollTop() > $(window).height()) {
            top -= (top + menu.height()) - $(window).height() + 22;
        }
        if (left + menu.width() - $(document).scrollLeft() > $(window).width()) {
            left -= (left + menu.width()) - $(window).width() + 18;
        }
        menu.css({
            top: top + "px",
            left: left + "px"
        })
        $(".red-ui-menu.red-ui-menu-dropdown").hide();
        $(document).on("mousedown.red-ui-workspace-context-menu", function (evt) {
            if (menu && menu[0].contains(evt.target)) {
                return
            }
            disposeMenu()
        });
        menu.show();
        // set focus to first item so that pressing escape key closes the menu
        $("#red-ui-workspace-context-menu :first(ul) > a").trigger("focus")

    }
    // Allow escape key hook and other editor events to close context menu
    RED.keyboard.add("red-ui-workspace-context-menu", "escape", function () { RED.contextMenu.hide() })
    RED.events.on("editor:open", function () { RED.contextMenu.hide() });
    RED.events.on("search:open", function () { RED.contextMenu.hide() });
    RED.events.on("type-search:open", function () { RED.contextMenu.hide() });
    RED.events.on("actionList:open", function () { RED.contextMenu.hide() });
    RED.events.on("view:selection-changed", function () { RED.contextMenu.hide() });
    return {
        show: show,
        hide: disposeMenu
    }
})()