import defined from '../../Core/defined.js';
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import destroyObject from '../../Core/destroyObject.js';
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import DeveloperError from '../../Core/DeveloperError.js';
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import EventHelper from '../../Core/EventHelper.js';
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import OrthographicFrustum from '../../Core/OrthographicFrustum.js';
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import SceneMode from '../../Scene/SceneMode.js';
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import knockout from '../../ThirdParty/knockout.js';
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import createCommand from '../createCommand.js';
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/**
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* The view model for {@link ProjectionPicker}.
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* @alias ProjectionPickerViewModel
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* @constructor
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*
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* @param {Scene} scene The Scene to switch projections.
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*/
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function ProjectionPickerViewModel(scene) {
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//>>includeStart('debug', pragmas.debug);
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if (!defined(scene)) {
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throw new DeveloperError('scene is required.');
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}
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//>>includeEnd('debug');
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this._scene = scene;
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this._orthographic = scene.camera.frustum instanceof OrthographicFrustum;
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this._flightInProgress = false;
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/**
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* Gets or sets whether the button drop-down is currently visible. This property is observable.
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* @type {Boolean}
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* @default false
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*/
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this.dropDownVisible = false;
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/**
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* Gets or sets the perspective projection tooltip. This property is observable.
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* @type {String}
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* @default 'Perspective Projection'
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*/
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this.tooltipPerspective = 'Perspective Projection';
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/**
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* Gets or sets the orthographic projection tooltip. This property is observable.
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* @type {String}
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* @default 'Orthographic Projection'
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*/
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this.tooltipOrthographic = 'Orthographic Projection';
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/**
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* Gets the currently active tooltip. This property is observable.
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* @type {String}
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*/
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this.selectedTooltip = undefined;
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/**
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* Gets or sets the current SceneMode. This property is observable.
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* @type {SceneMode}
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*/
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this.sceneMode = scene.mode;
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knockout.track(this, ['_orthographic', '_flightInProgress', 'sceneMode', 'dropDownVisible', 'tooltipPerspective', 'tooltipOrthographic']);
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var that = this;
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knockout.defineProperty(this, 'selectedTooltip', function() {
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if (that._orthographic) {
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return that.tooltipOrthographic;
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}
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return that.tooltipPerspective;
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});
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this._toggleDropDown = createCommand(function() {
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if (that.sceneMode === SceneMode.SCENE2D || that._flightInProgress) {
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return;
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}
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that.dropDownVisible = !that.dropDownVisible;
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});
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this._eventHelper = new EventHelper();
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this._eventHelper.add(scene.morphComplete, function(transitioner, oldMode, newMode, isMorphing) {
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that.sceneMode = newMode;
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that._orthographic = newMode === SceneMode.SCENE2D || that._scene.camera.frustum instanceof OrthographicFrustum;
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});
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this._eventHelper.add(scene.preRender, function() {
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that._flightInProgress = defined(scene.camera._currentFlight);
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});
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this._switchToPerspective = createCommand(function() {
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if (that.sceneMode === SceneMode.SCENE2D) {
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return;
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}
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that._scene.camera.switchToPerspectiveFrustum();
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that._orthographic = false;
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that.dropDownVisible = false;
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});
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this._switchToOrthographic = createCommand(function() {
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if (that.sceneMode === SceneMode.SCENE2D) {
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return;
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}
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that._scene.camera.switchToOrthographicFrustum();
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that._orthographic = true;
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that.dropDownVisible = false;
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});
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//Used by knockout
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this._sceneMode = SceneMode;
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}
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Object.defineProperties(ProjectionPickerViewModel.prototype, {
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/**
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* Gets the scene
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* @memberof ProjectionPickerViewModel.prototype
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* @type {Scene}
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*/
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scene : {
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get : function() {
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return this._scene;
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}
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},
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/**
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* Gets the command to toggle the drop down box.
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* @memberof ProjectionPickerViewModel.prototype
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*
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* @type {Command}
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*/
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toggleDropDown : {
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get : function() {
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return this._toggleDropDown;
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}
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},
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/**
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* Gets the command to switch to a perspective projection.
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* @memberof ProjectionPickerViewModel.prototype
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*
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* @type {Command}
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*/
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switchToPerspective : {
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get : function() {
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return this._switchToPerspective;
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}
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},
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/**
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* Gets the command to switch to orthographic projection.
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* @memberof ProjectionPickerViewModel.prototype
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*
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* @type {Command}
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*/
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switchToOrthographic : {
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get : function() {
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return this._switchToOrthographic;
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}
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},
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/**
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* Gets whether the scene is currently using an orthographic projection.
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* @memberof ProjectionPickerViewModel.prototype
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*
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* @type {Command}
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*/
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isOrthographicProjection : {
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get : function() {
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return this._orthographic;
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}
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}
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});
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/**
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* @returns {Boolean} true if the object has been destroyed, false otherwise.
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*/
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ProjectionPickerViewModel.prototype.isDestroyed = function() {
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return false;
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};
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/**
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* Destroys the view model.
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*/
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ProjectionPickerViewModel.prototype.destroy = function() {
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this._eventHelper.removeAll();
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destroyObject(this);
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};
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export default ProjectionPickerViewModel;
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