Method enter

modules/modes/DrawLineMode.js:79–152

* enter * Enters the mode. * Draw a new line, or optionally continue an existing line. * @param {Object?} options - Optional `Object` of options passed to the new mode * @param {Object} options.continueNodeID - an OSM node to continue from * @param {Object} options.continueWay

(options = {})

   * @return {boolean}  `true` if the mode can be entered, `false` if not
   */
  enter(options = {}) {
    const context = this.context;
    const editor = context.systems.editor;
    const graph = editor.staging.graph;

    const continueNodeID = options.continueNodeID;
    const continueWayID = options.continueWayID;
    const continueNode = continueNodeID && graph.hasEntity(continueNodeID);
    const continueWay = continueWayID && graph.hasEntity(continueWayID);

    // If either parameter is present, make sure they are both valid
    if (continueNode || continueWay) {
      if (!(continueNode instanceof osmNode)) return false;
      if (!(continueWay instanceof osmWay)) return false;

      if (DEBUG) {
        console.log(`DrawLineMode: entering, continuing line ${continueWay.id}`);  // eslint-disable-line no-console
      }

    } else {    // Start a new line
      if (DEBUG) {
        console.log('DrawLineMode: entering');  // eslint-disable-line no-console
      }
    }

    this._active = true;

    this.drawWayID = null;
    this.drawNodeID = null;
    this.lastNodeID = null;
    this.firstNodeID = null;
    this._insertIndex = undefined;
    this._lastPoint = null;
    this._selectedData.clear();

    const eventManager = context.systems.gfx.events;
    eventManager.setCursor('crosshair');

    context.enableBehaviors(['hover', 'draw', 'mapInteraction', 'mapNudge']);

    context.behaviors.hover
      .on('hoverchange', this._hover);

    context.behaviors.draw
      .on('move', this._move)
      .on('click', this._click)
      .on('finish', this._finish)
      .on('cancel', this._cancel);

    context.behaviors.mapNudge
      .on('nudge', this._nudge);

    editor
      .on('historyjump', this._restoreSnapshot);

    context.behaviors.mapInteraction.doubleClickEnabled = false;

    editor.setCheckpoint('beginDraw');