office-ui-fabric-react/lib/components/Layer/Layer.notification.js

Reusable React components for building experiences for Microsoft 365.

var _layersByHostId = {};
var _layerHostsById = {};
var _defaultHostSelector;
/**
 * Register a layer for a given host id
 * @param hostId - Id of the layer host
 * @param layer - Layer instance
 */
export function registerLayer(hostId, callback) {
    if (!_layersByHostId[hostId]) {
        _layersByHostId[hostId] = [];
    }
    _layersByHostId[hostId].push(callback);
    var layerHosts = _layerHostsById[hostId];
    if (layerHosts) {
        for (var _i = 0, layerHosts_1 = layerHosts; _i < layerHosts_1.length; _i++) {
            var layerHost = layerHosts_1[_i];
            layerHost.notifyLayersChanged();
        }
    }
}
/**
 * Unregister a layer for a given host id
 * @param hostId - Id of the layer host
 * @param layer - Layer instance
 */
export function unregisterLayer(hostId, callback) {
    var layers = _layersByHostId[hostId];
    if (layers) {
        var idx = layers.indexOf(callback);
        if (idx >= 0) {
            layers.splice(idx, 1);
            if (layers.length === 0) {
                delete _layersByHostId[hostId];
            }
        }
    }
    var layerHosts = _layerHostsById[hostId];
    if (layerHosts) {
        for (var _i = 0, layerHosts_2 = layerHosts; _i < layerHosts_2.length; _i++) {
            var layerHost = layerHosts_2[_i];
            layerHost.notifyLayersChanged();
        }
    }
}
/**
 * Gets the number of layers currently registered with a host id.
 * @param hostId - Id of the layer host.
 * @returns The number of layers currently registered with the host.
 */
export function getLayerCount(hostId) {
    var layers = _layerHostsById[hostId];
    return layers ? layers.length : 0;
}
/**
 * Gets the Layer Host instance associated with a hostId, if applicable.
 * @param hostId - Id of the layer host.
 * @returns A component ref for the associated layer host.
 */
export function getLayerHost(hostId) {
    var layerHosts = _layerHostsById[hostId];
    return (layerHosts && layerHosts[0]) || undefined;
}
/**
 * Registers a Layer Host with an associated hostId.
 * @param hostId - Id of the layer host
 * @param layerHost - layer host instance
 */
export function registerLayerHost(hostId, layerHost) {
    var layerHosts = _layerHostsById[hostId] || (_layerHostsById[hostId] = []);
    // Insert this at the start of an array to avoid race conditions between mount and unmount.
    // If a LayerHost is re-mounted, and mount of the new instance may occur before the unmount of the old one.
    // Putting the new instance at the start of this array ensures that calls to `getLayerHost` will immediately
    // get the new one even if the old one is around briefly.
    layerHosts.unshift(layerHost);
}
/**
 * Unregisters a Layer Host from the associated hostId.
 * @param hostId - Id of the layer host
 * @param layerHost - layer host instance
 */
export function unregisterLayerHost(hostId, layerHost) {
    var layerHosts = _layerHostsById[hostId];
    if (layerHosts) {
        var idx = layerHosts.indexOf(layerHost);
        if (idx >= 0) {
            layerHosts.splice(idx, 1);
        }
        if (layerHosts.length === 0) {
            delete _layerHostsById[hostId];
        }
    }
}
/**
 * Used for notifying applicable Layers that a host is available/unavailable and to re-evaluate Layers that
 * care about the specific host.
 */
export function notifyHostChanged(id) {
    if (_layersByHostId[id]) {
        _layersByHostId[id].forEach(function (callback) { return callback(); });
    }
}
/**
 * Sets the default target selector to use when determining the host in which
 * Layered content will be injected into. If not provided, an element will be
 * created at the end of the document body.
 *
 * Passing in a falsey value will clear the default target and reset back to
 * using a created element at the end of document body.
 */
export function setDefaultTarget(selector) {
    _defaultHostSelector = selector;
}
/**
 * Get the default target selector when determining a host
 */
export function getDefaultTarget() {
    return _defaultHostSelector;
}
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