angular2/src/directives/switch.map

Angular 2 - a web framework for modern web apps

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{Decorator, Viewport} from 'angular2/src/core/annotations/annotations';\nimport {ViewContainer} from 'angular2/src/core/compiler/view_container';\nimport {isPresent, isBlank, normalizeBlank} from 'angular2/src/facade/lang';\nimport {ListWrapper, List, MapWrapper, Map} from 'angular2/src/facade/collection';\nimport {Parent} from 'angular2/src/core/annotations/visibility';\n\n/**\n * The `Switch` directive is used to conditionally swap DOM structure on your template based on a\n * scope expression.\n * Elements within `Switch` but without `SwitchWhen` or `SwitchDefault` directives will be\n * preserved at the location as specified in the template.\n *\n * `Switch` simply chooses nested elements and makes them visible based on which element matches\n * the value obtained from the evaluated expression. In other words, you define a container element\n * (where you place the directive), place an expression on the **`[switch]=\"...\"` attribute**),\n * define any inner elements inside of the directive and place a `[switch-when]` attribute per\n * element.\n * The when attribute is used to inform Switch which element to display when the expression is\n * evaluated. If a matching expression is not found via a when attribute then an element with the\n * default attribute is displayed.\n *\n * # Example:\n *\n * ```\n * <ANY [switch]=\"expression\">\n *   <template [switch-when]=\"whenExpression1\">...</template>\n *   <template [switch-when]=\"whenExpression1\">...</template>\n *   <template [switch-default]>...</template>\n * </ANY>\n * ```\n *\n * @exportedAs angular2/directives\n */\n@Decorator({\n  selector: '[switch]',\n  properties: {\n    'value': 'switch'\n  }\n})\nexport class Switch {\n  _switchValue: any;\n  _useDefault: boolean;\n  _valueViewContainers: Map;\n  _activeViewContainers: List<ViewContainer>;\n\n  constructor() {\n    this._valueViewContainers = MapWrapper.create();\n    this._activeViewContainers = ListWrapper.create();\n    this._useDefault = false;\n  }\n\n  set value(value) {\n    // Empty the currently active ViewContainers\n    this._emptyAllActiveViewContainers();\n\n    // Add the ViewContainers matching the value (with a fallback to default)\n    this._useDefault = false;\n    var containers = MapWrapper.get(this._valueViewContainers, value);\n    if (isBlank(containers)) {\n      this._useDefault = true;\n      containers = normalizeBlank(MapWrapper.get(this._valueViewContainers, _whenDefault));\n    }\n    this._activateViewContainers(containers);\n\n    this._switchValue = value;\n  }\n\n  _onWhenValueChanged(oldWhen, newWhen, viewContainer: ViewContainer) {\n    this._deregisterViewContainer(oldWhen, viewContainer);\n    this._registerViewContainer(newWhen, viewContainer);\n\n    if (oldWhen === this._switchValue) {\n      viewContainer.remove();\n      ListWrapper.remove(this._activeViewContainers, viewContainer);\n    } else if (newWhen === this._switchValue) {\n      if (this._useDefault) {\n        this._useDefault = false;\n        this._emptyAllActiveViewContainers();\n      }\n      viewContainer.create();\n      ListWrapper.push(this._activeViewContainers, viewContainer);\n    }\n\n    // Switch to default when there is no more active ViewContainers\n    if (this._activeViewContainers.length === 0 && !this._useDefault) {\n      this._useDefault = true;\n      this._activateViewContainers(MapWrapper.get(this._valueViewContainers, _whenDefault));\n    }\n  }\n\n  _emptyAllActiveViewContainers() {\n    var activeContainers = this._activeViewContainers;\n    for (var i = 0; i < activeContainers.length; i++) {\n      activeContainers[i].remove();\n    }\n    this._activeViewContainers = ListWrapper.create();\n  }\n\n  _activateViewContainers(containers: List<ViewContainer>) {\n    // TODO(vicb): assert(this._activeViewContainers.length === 0);\n    if (isPresent(containers)) {\n      for (var i = 0; i < containers.length; i++) {\n        containers[i].create();\n      }\n      this._activeViewContainers = containers;\n    }\n  }\n\n  _registerViewContainer(value, container: ViewContainer) {\n    var containers = MapWrapper.get(this._valueViewContainers, value);\n    if (isBlank(containers)) {\n      containers = ListWrapper.create();\n      MapWrapper.set(this._valueViewContainers, value, containers);\n    }\n    ListWrapper.push(containers, container);\n  }\n\n  _deregisterViewContainer(value, container: ViewContainer) {\n    // `_whenDefault` is used a marker for non-registered whens\n    if (value == _whenDefault) return;\n    var containers = MapWrapper.get(this._valueViewContainers, value);\n    if (containers.length == 1) {\n      MapWrapper.delete(this._valueViewContainers, value);\n    } else {\n      ListWrapper.remove(containers, container);\n    }\n  }\n}\n\n/**\n * Defines a case statement as an expression.\n *\n * If multiple `SwitchWhen` match the `Switch` value, all of them are displayed.\n *\n * Example:\n *\n * ```\n * // match against a context variable\n * <template [switch-when]=\"contextVariable\">...</template>\n *\n * // match against a constant string\n * <template [switch-when]=\"'stringValue'\">...</template>\n * ```\n *\n * @exportedAs angular2/directives\n */\n@Viewport({\n  selector: '[switch-when]',\n  properties: {\n    'when' : 'switch-when'\n  }\n})\nexport class SwitchWhen {\n  _value: any;\n  _switch: Switch;\n  _viewContainer: ViewContainer;\n\n  constructor(viewContainer: ViewContainer, @Parent() sswitch: Switch) {\n    // `_whenDefault` is used as a marker for a not yet initialized value\n    this._value = _whenDefault;\n    this._switch = sswitch;\n    this._viewContainer = viewContainer;\n  }\n\n  set when(value) {\n    this._switch._onWhenValueChanged(this._value, value, this._viewContainer);\n    this._value = value;\n  }\n}\n\n\n/**\n * Defines a default case statement.\n *\n * Default case statements are displayed when no `SwitchWhen` match the `switch` value.\n *\n * Example:\n *\n * ```\n * <template [switch-default]>...</template>\n * ```\n *\n * @exportedAs angular2/directives\n */\n@Viewport({\n  selector: '[switch-default]'\n})\nexport class SwitchDefault {\n  constructor(viewContainer: ViewContainer, @Parent() sswitch: Switch) {\n    sswitch._registerViewContainer(_whenDefault, viewContainer);\n  }\n}\n\nvar _whenDefault = new Object();\n"]}