@glimmer/runtime
Version:
Minimal runtime needed to render Glimmer templates
389 lines (307 loc) • 36.1 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = exports.OnModifierState = void 0;
var _destroyable = require("@glimmer/destroyable");
var _env = require("@glimmer/env");
var _manager = require("@glimmer/manager");
var _reference = require("@glimmer/reference");
var _runtime = require("@glimmer/runtime");
var _validator = require("@glimmer/validator");
var _util = require("@glimmer/util");
const untouchableContext = (0, _util.buildUntouchableThis)('`on` modifier');
/*
Internet Explorer 11 does not support `once` and also does not support
passing `eventOptions`. In some situations it then throws a weird script
error, like:
```
Could not complete the operation due to error 80020101
```
This flag determines, whether `{ once: true }` and thus also event options in
general are supported.
*/
const SUPPORTS_EVENT_OPTIONS = (() => {
try {
const div = document.createElement('div');
let counter = 0;
div.addEventListener('click', () => counter++, {
once: true
});
let event;
if (typeof Event === 'function') {
event = new Event('click');
} else {
event = document.createEvent('Event');
event.initEvent('click', true, true);
}
div.dispatchEvent(event);
div.dispatchEvent(event);
return counter === 1;
} catch (error) {
return false;
}
})();
class OnModifierState {
constructor(element, args) {
this.tag = (0, _validator.createUpdatableTag)();
this.shouldUpdate = true;
this.element = element;
this.args = args;
}
updateFromArgs() {
let {
args
} = this;
let {
once,
passive,
capture
} = (0, _runtime.reifyNamed)(args.named);
if (once !== this.once) {
this.once = once;
this.shouldUpdate = true;
}
if (passive !== this.passive) {
this.passive = passive;
this.shouldUpdate = true;
}
if (capture !== this.capture) {
this.capture = capture;
this.shouldUpdate = true;
}
let options; // we want to handle both `true` and `false` because both have a meaning:
// https://bugs.chromium.org/p/chromium/issues/detail?id=770208
if (once !== undefined || passive !== undefined || capture !== undefined) {
options = this.options = {
once,
passive,
capture
};
} else {
this.options = undefined;
}
if (_env.DEBUG && (args.positional[0] === undefined || typeof (0, _reference.valueForRef)(args.positional[0]) !== 'string')) {
throw new Error('You must pass a valid DOM event name as the first argument to the `on` modifier');
}
let eventName = (0, _reference.valueForRef)(args.positional[0]);
if (eventName !== this.eventName) {
this.eventName = eventName;
this.shouldUpdate = true;
}
let userProvidedCallbackReference = args.positional[1];
if (_env.DEBUG) {
if (args.positional[1] === undefined) {
throw new Error(`You must pass a function as the second argument to the \`on\` modifier.`);
}
let value = (0, _reference.valueForRef)(userProvidedCallbackReference);
if (typeof value !== 'function') {
throw new Error(`You must pass a function as the second argument to the \`on\` modifier; you passed ${value === null ? 'null' : typeof value}. While rendering:\n\n${userProvidedCallbackReference.debugLabel}`);
}
}
let userProvidedCallback = (0, _reference.valueForRef)(userProvidedCallbackReference);
if (userProvidedCallback !== this.userProvidedCallback) {
this.userProvidedCallback = userProvidedCallback;
this.shouldUpdate = true;
}
if (_env.DEBUG && args.positional.length !== 2) {
throw new Error(`You can only pass two positional arguments (event name and callback) to the \`on\` modifier, but you provided ${args.positional.length}. Consider using the \`fn\` helper to provide additional arguments to the \`on\` callback.`);
}
let needsCustomCallback = SUPPORTS_EVENT_OPTIONS === false && once ||
/* needs manual once implementation */
_env.DEBUG && passive;
/* needs passive enforcement */
if (this.shouldUpdate) {
if (needsCustomCallback) {
let callback = this.callback = function (event) {
if (_env.DEBUG && passive) {
event.preventDefault = () => {
throw new Error(`You marked this listener as 'passive', meaning that you must not call 'event.preventDefault()': \n\n${userProvidedCallback}`);
};
}
if (!SUPPORTS_EVENT_OPTIONS && once) {
removeEventListener(this, eventName, callback, options);
}
return userProvidedCallback.call(untouchableContext, event);
};
} else if (_env.DEBUG) {
// prevent the callback from being bound to the element
this.callback = userProvidedCallback.bind(untouchableContext);
} else {
this.callback = userProvidedCallback;
}
}
}
}
exports.OnModifierState = OnModifierState;
let adds = 0;
let removes = 0;
function removeEventListener(element, eventName, callback, options) {
removes++;
if (SUPPORTS_EVENT_OPTIONS) {
// when options are supported, use them across the board
element.removeEventListener(eventName, callback, options);
} else if (options !== undefined && options.capture) {
// used only in the following case:
//
// `{ once: true | false, passive: true | false, capture: true }
//
// `once` is handled via a custom callback that removes after first
// invocation so we only care about capture here as a boolean
element.removeEventListener(eventName, callback, true);
} else {
// used only in the following cases:
//
// * where there is no options
// * `{ once: true | false, passive: true | false, capture: false }
element.removeEventListener(eventName, callback);
}
}
function addEventListener(element, eventName, callback, options) {
adds++;
if (SUPPORTS_EVENT_OPTIONS) {
// when options are supported, use them across the board
element.addEventListener(eventName, callback, options);
} else if (options !== undefined && options.capture) {
// used only in the following case:
//
// `{ once: true | false, passive: true | false, capture: true }
//
// `once` is handled via a custom callback that removes after first
// invocation so we only care about capture here as a boolean
element.addEventListener(eventName, callback, true);
} else {
// used only in the following cases:
//
// * where there is no options
// * `{ once: true | false, passive: true | false, capture: false }
element.addEventListener(eventName, callback);
}
}
/**
The `{{on}}` modifier lets you easily add event listeners (it uses
[EventTarget.addEventListener](https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener)
internally).
For example, if you'd like to run a function on your component when a `<button>`
in the components template is clicked you might do something like:
```app/components/like-post.hbs
<button {{on 'click' this.saveLike}}>Like this post!</button>
```
```app/components/like-post.js
import Component from '@glimmer/component';
import { action } from '@ember/object';
export default class LikePostComponent extends Component {
saveLike = () => {
// someone likes your post!
// better send a request off to your server...
}
}
```
### Arguments
`{{on}}` accepts two positional arguments, and a few named arguments.
The positional arguments are:
- `event` -- the name to use when calling `addEventListener`
- `callback` -- the function to be passed to `addEventListener`
The named arguments are:
- capture -- a `true` value indicates that events of this type will be dispatched
to the registered listener before being dispatched to any EventTarget beneath it
in the DOM tree.
- once -- indicates that the listener should be invoked at most once after being
added. If true, the listener would be automatically removed when invoked.
- passive -- if `true`, indicates that the function specified by listener will never
call preventDefault(). If a passive listener does call preventDefault(), the user
agent will do nothing other than generate a console warning. See
[Improving scrolling performance with passive listeners](https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener#Improving_scrolling_performance_with_passive_listeners)
to learn more.
The callback function passed to `{{on}}` will receive any arguments that are passed
to the event handler. Most commonly this would be the `event` itself.
If you would like to pass additional arguments to the function you should use
the `{{fn}}` helper.
For example, in our example case above if you'd like to pass in the post that
was being liked when the button is clicked you could do something like:
```app/components/like-post.hbs
<button {{on 'click' (fn this.saveLike @post)}}>Like this post!</button>
```
In this case, the `saveLike` function will receive two arguments: the click event
and the value of `@post`.
### Function Context
In the example above, we used an arrow function to ensure that `likePost` is
properly bound to the `items-list`, but let's explore what happens if we
left out the arrow function:
```app/components/like-post.js
import Component from '@glimmer/component';
export default class LikePostComponent extends Component {
saveLike() {
// ...snip...
}
}
```
In this example, when the button is clicked `saveLike` will be invoked,
it will **not** have access to the component instance. In other
words, it will have no `this` context, so please make sure your functions
are bound (via an arrow function or other means) before passing into `on`!
@method on
@public
*/
class OnModifierManager {
constructor() {
this.SUPPORTS_EVENT_OPTIONS = SUPPORTS_EVENT_OPTIONS;
}
getDebugName() {
return 'on';
}
get counters() {
return {
adds,
removes
};
}
create(_owner, element, _state, args) {
return new OnModifierState(element, args);
}
getTag(state) {
if (state === null) {
return null;
}
return state.tag;
}
install(state) {
if (state === null) {
return;
}
state.updateFromArgs();
let {
element,
eventName,
callback,
options
} = state;
addEventListener(element, eventName, callback, options);
(0, _destroyable.registerDestructor)(state, () => removeEventListener(element, eventName, callback, options));
state.shouldUpdate = false;
}
update(state) {
if (state === null) {
return;
} // stash prior state for el.removeEventListener
let {
element,
eventName,
callback,
options
} = state;
state.updateFromArgs();
if (!state.shouldUpdate) {
return;
} // use prior state values for removal
removeEventListener(element, eventName, callback, options); // read updated values from the state object
addEventListener(state.element, state.eventName, state.callback, state.options);
state.shouldUpdate = false;
}
getDestroyable(state) {
return state;
}
}
var _default = (0, _manager.setInternalModifierManager)(new OnModifierManager(), {});
exports.default = _default;
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{ registerDestructor } from '@glimmer/destroyable';\nimport { DEBUG } from '@glimmer/env';\nimport { CapturedArguments, InternalModifierManager, Owner } from '@glimmer/interfaces';\nimport { setInternalModifierManager } from '@glimmer/manager';\nimport { valueForRef } from '@glimmer/reference';\nimport { reifyNamed } from '@glimmer/runtime';\nimport { createUpdatableTag, UpdatableTag } from '@glimmer/validator';\nimport { SimpleElement } from '@simple-dom/interface';\nimport { buildUntouchableThis } from '@glimmer/util';\n\nconst untouchableContext = buildUntouchableThis('`on` modifier');\n\n/*\n  Internet Explorer 11 does not support `once` and also does not support\n  passing `eventOptions`. In some situations it then throws a weird script\n  error, like:\n\n  ```\n  Could not complete the operation due to error 80020101\n  ```\n\n  This flag determines, whether `{ once: true }` and thus also event options in\n  general are supported.\n*/\nconst SUPPORTS_EVENT_OPTIONS = (() => {\n  try {\n    const div = document.createElement('div');\n    let counter = 0;\n    div.addEventListener('click', () => counter++, { once: true });\n\n    let event;\n    if (typeof Event === 'function') {\n      event = new Event('click');\n    } else {\n      event = document.createEvent('Event');\n      event.initEvent('click', true, true);\n    }\n\n    div.dispatchEvent(event);\n    div.dispatchEvent(event);\n\n    return counter === 1;\n  } catch (error) {\n    return false;\n  }\n})();\n\nexport class OnModifierState {\n  public tag = createUpdatableTag();\n  public element: Element;\n  public args: CapturedArguments;\n  public eventName!: string;\n  public callback!: EventListener;\n  private userProvidedCallback!: EventListener;\n  public once?: boolean;\n  public passive?: boolean;\n  public capture?: boolean;\n  public options?: AddEventListenerOptions;\n  public shouldUpdate = true;\n\n  constructor(element: Element, args: CapturedArguments) {\n    this.element = element;\n    this.args = args;\n  }\n\n  updateFromArgs(): void {\n    let { args } = this;\n\n    let { once, passive, capture }: AddEventListenerOptions = reifyNamed(args.named);\n    if (once !== this.once) {\n      this.once = once;\n      this.shouldUpdate = true;\n    }\n\n    if (passive !== this.passive) {\n      this.passive = passive;\n      this.shouldUpdate = true;\n    }\n\n    if (capture !== this.capture) {\n      this.capture = capture;\n      this.shouldUpdate = true;\n    }\n\n    let options: AddEventListenerOptions;\n    // we want to handle both `true` and `false` because both have a meaning:\n    // https://bugs.chromium.org/p/chromium/issues/detail?id=770208\n    if (once !== undefined || passive !== undefined || capture !== undefined) {\n      options = this.options = { once, passive, capture };\n    } else {\n      this.options = undefined;\n    }\n\n    if (\n      DEBUG &&\n      (args.positional[0] === undefined || typeof valueForRef(args.positional[0]) !== 'string')\n    ) {\n      throw new Error(\n        'You must pass a valid DOM event name as the first argument to the `on` modifier'\n      );\n    }\n\n    let eventName = valueForRef(args.positional[0]) as string;\n    if (eventName !== this.eventName) {\n      this.eventName = eventName;\n      this.shouldUpdate = true;\n    }\n\n    let userProvidedCallbackReference = args.positional[1];\n\n    if (DEBUG) {\n      if (args.positional[1] === undefined) {\n        throw new Error(`You must pass a function as the second argument to the \\`on\\` modifier.`);\n      }\n\n      let value = valueForRef(userProvidedCallbackReference);\n\n      if (typeof value !== 'function') {\n        throw new Error(\n          `You must pass a function as the second argument to the \\`on\\` modifier; you passed ${\n            value === null ? 'null' : typeof value\n          }. While rendering:\\n\\n${userProvidedCallbackReference.debugLabel}`\n        );\n      }\n    }\n\n    let userProvidedCallback = valueForRef(userProvidedCallbackReference) as EventListener;\n    if (userProvidedCallback !== this.userProvidedCallback) {\n      this.userProvidedCallback = userProvidedCallback;\n      this.shouldUpdate = true;\n    }\n\n    if (DEBUG && args.positional.length !== 2) {\n      throw new Error(\n        `You can only pass two positional arguments (event name and callback) to the \\`on\\` modifier, but you provided ${args.positional.length}. Consider using the \\`fn\\` helper to provide additional arguments to the \\`on\\` callback.`\n      );\n    }\n\n    let needsCustomCallback =\n      (SUPPORTS_EVENT_OPTIONS === false && once) /* needs manual once implementation */ ||\n      (DEBUG && passive); /* needs passive enforcement */\n\n    if (this.shouldUpdate) {\n      if (needsCustomCallback) {\n        let callback = (this.callback = function (this: Element, event) {\n          if (DEBUG && passive) {\n            event.preventDefault = () => {\n              throw new Error(\n                `You marked this listener as 'passive', meaning that you must not call 'event.preventDefault()': \\n\\n${userProvidedCallback}`\n              );\n            };\n          }\n\n          if (!SUPPORTS_EVENT_OPTIONS && once) {\n            removeEventListener(this, eventName, callback, options);\n          }\n          return userProvidedCallback.call(untouchableContext, event);\n        });\n      } else if (DEBUG) {\n        // prevent the callback from being bound to the element\n        this.callback = userProvidedCallback.bind(untouchableContext);\n      } else {\n        this.callback = userProvidedCallback;\n      }\n    }\n  }\n}\n\nlet adds = 0;\nlet removes = 0;\n\nfunction removeEventListener(\n  element: Element,\n  eventName: string,\n  callback: EventListener,\n  options?: AddEventListenerOptions\n): void {\n  removes++;\n\n  if (SUPPORTS_EVENT_OPTIONS) {\n    // when options are supported, use them across the board\n    element.removeEventListener(eventName, callback, options);\n  } else if (options !== undefined && options.capture) {\n    // used only in the following case:\n    //\n    // `{ once: true | false, passive: true | false, capture: true }\n    //\n    // `once` is handled via a custom callback that removes after first\n    // invocation so we only care about capture here as a boolean\n    element.removeEventListener(eventName, callback, true);\n  } else {\n    // used only in the following cases:\n    //\n    // * where there is no options\n    // * `{ once: true | false, passive: true | false, capture: false }\n    element.removeEventListener(eventName, callback);\n  }\n}\n\nfunction addEventListener(\n  element: Element,\n  eventName: string,\n  callback: EventListener,\n  options?: AddEventListenerOptions\n): void {\n  adds++;\n\n  if (SUPPORTS_EVENT_OPTIONS) {\n    // when options are supported, use them across the board\n    element.addEventListener(eventName, callback, options);\n  } else if (options !== undefined && options.capture) {\n    // used only in the following case:\n    //\n    // `{ once: true | false, passive: true | false, capture: true }\n    //\n    // `once` is handled via a custom callback that removes after first\n    // invocation so we only care about capture here as a boolean\n    element.addEventListener(eventName, callback, true);\n  } else {\n    // used only in the following cases:\n    //\n    // * where there is no options\n    // * `{ once: true | false, passive: true | false, capture: false }\n    element.addEventListener(eventName, callback);\n  }\n}\n\n/**\n  The `{{on}}` modifier lets you easily add event listeners (it uses\n  [EventTarget.addEventListener](https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener)\n  internally).\n\n  For example, if you'd like to run a function on your component when a `<button>`\n  in the components template is clicked you might do something like:\n\n  ```app/components/like-post.hbs\n  <button {{on 'click' this.saveLike}}>Like this post!</button>\n  ```\n\n  ```app/components/like-post.js\n  import Component from '@glimmer/component';\n  import { action } from '@ember/object';\n\n  export default class LikePostComponent extends Component {\n    saveLike = () => {\n      // someone likes your post!\n      // better send a request off to your server...\n    }\n  }\n  ```\n\n  ### Arguments\n\n  `{{on}}` accepts two positional arguments, and a few named arguments.\n\n  The positional arguments are:\n\n  - `event` -- the name to use when calling `addEventListener`\n  - `callback` -- the function to be passed to `addEventListener`\n\n  The named arguments are:\n\n  - capture -- a `true` value indicates that events of this type will be dispatched\n    to the registered listener before being dispatched to any EventTarget beneath it\n    in the DOM tree.\n  - once -- indicates that the listener should be invoked at most once after being\n    added. If true, the listener would be automatically removed when invoked.\n  - passive -- if `true`, indicates that the function specified by listener will never\n    call preventDefault(). If a passive listener does call preventDefault(), the user\n    agent will do nothing other than generate a console warning. See\n    [Improving scrolling performance with passive listeners](https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener#Improving_scrolling_performance_with_passive_listeners)\n    to learn more.\n\n  The callback function passed to `{{on}}` will receive any arguments that are passed\n  to the event handler. Most commonly this would be the `event` itself.\n\n  If you would like to pass additional arguments to the function you should use\n  the `{{fn}}` helper.\n\n  For example, in our example case above if you'd like to pass in the post that\n  was being liked when the button is clicked you could do something like:\n\n  ```app/components/like-post.hbs\n  <button {{on 'click' (fn this.saveLike @post)}}>Like this post!</button>\n  ```\n\n  In this case, the `saveLike` function will receive two arguments: the click event\n  and the value of `@post`.\n\n  ### Function Context\n\n  In the example above, we used an arrow function to ensure that `likePost` is\n  properly bound to the `items-list`, but let's explore what happens if we\n  left out the arrow function:\n\n  ```app/components/like-post.js\n  import Component from '@glimmer/component';\n\n  export default class LikePostComponent extends Component {\n    saveLike() {\n      // ...snip...\n    }\n  }\n  ```\n\n  In this example, when the button is clicked `saveLike` will be invoked,\n  it will **not** have access to the component instance. In other\n  words, it will have no `this` context, so please make sure your functions\n  are bound (via an arrow function or other means) before passing into `on`!\n\n  @method on\n  @public\n*/\nclass OnModifierManager implements InternalModifierManager<OnModifierState | null, object> {\n  public SUPPORTS_EVENT_OPTIONS: boolean = SUPPORTS_EVENT_OPTIONS;\n\n  getDebugName(): string {\n    return 'on';\n  }\n\n  get counters(): { adds: number; removes: number } {\n    return { adds, removes };\n  }\n\n  create(\n    _owner: Owner,\n    element: SimpleElement | Element,\n    _state: object,\n    args: CapturedArguments\n  ): OnModifierState | null {\n    return new OnModifierState(element as Element, args);\n  }\n\n  getTag(state: OnModifierState | null): UpdatableTag | null {\n    if (state === null) {\n      return null;\n    }\n\n    return state.tag;\n  }\n\n  install(state: OnModifierState | null): void {\n    if (state === null) {\n      return;\n    }\n\n    state.updateFromArgs();\n\n    let { element, eventName, callback, options } = state;\n\n    addEventListener(element, eventName, callback, options);\n\n    registerDestructor(state, () => removeEventListener(element, eventName, callback, options));\n\n    state.shouldUpdate = false;\n  }\n\n  update(state: OnModifierState | null): void {\n    if (state === null) {\n      return;\n    }\n\n    // stash prior state for el.removeEventListener\n    let { element, eventName, callback, options } = state;\n\n    state.updateFromArgs();\n\n    if (!state.shouldUpdate) {\n      return;\n    }\n\n    // use prior state values for removal\n    removeEventListener(element, eventName, callback, options);\n\n    // read updated values from the state object\n    addEventListener(state.element, state.eventName, state.callback, state.options);\n\n    state.shouldUpdate = false;\n  }\n\n  getDestroyable(state: OnModifierState | null): OnModifierState | null {\n    return state;\n  }\n}\n\nexport default setInternalModifierManager(new OnModifierManager(), {});\n"],"sourceRoot":""}