Add existing to tracked

node_modules/@cesium/widgets/Source/NavigationHelpButton/NavigationHelpButtonViewModel.js

@@ -0,0 +1,77 @@
+import knockout from "../ThirdParty/knockout.js";
+import createCommand from "../createCommand.js";
+
+/**
+ * The view model for {@link NavigationHelpButton}.
+ * @alias NavigationHelpButtonViewModel
+ * @constructor
+ */
+function NavigationHelpButtonViewModel() {
+  /**
+   * Gets or sets whether the instructions are currently shown.  This property is observable.
+   * @type {boolean}
+   * @default false
+   */
+  this.showInstructions = false;
+
+  const that = this;
+  this._command = createCommand(function () {
+    that.showInstructions = !that.showInstructions;
+  });
+  this._showClick = createCommand(function () {
+    that._touch = false;
+  });
+  this._showTouch = createCommand(function () {
+    that._touch = true;
+  });
+
+  this._touch = false;
+
+  /**
+   * Gets or sets the tooltip.  This property is observable.
+   *
+   * @type {string}
+   */
+  this.tooltip = "Navigation Instructions";
+
+  knockout.track(this, ["tooltip", "showInstructions", "_touch"]);
+}
+
+Object.defineProperties(NavigationHelpButtonViewModel.prototype, {
+  /**
+   * Gets the Command that is executed when the button is clicked.
+   * @memberof NavigationHelpButtonViewModel.prototype
+   *
+   * @type {Command}
+   */
+  command: {
+    get: function () {
+      return this._command;
+    },
+  },
+
+  /**
+   * Gets the Command that is executed when the mouse instructions should be shown.
+   * @memberof NavigationHelpButtonViewModel.prototype
+   *
+   * @type {Command}
+   */
+  showClick: {
+    get: function () {
+      return this._showClick;
+    },
+  },
+
+  /**
+   * Gets the Command that is executed when the touch instructions should be shown.
+   * @memberof NavigationHelpButtonViewModel.prototype
+   *
+   * @type {Command}
+   */
+  showTouch: {
+    get: function () {
+      return this._showTouch;
+    },
+  },
+});
+export default NavigationHelpButtonViewModel;