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added ability to change language of all app-localize-behavior instances #44

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b6ab880
added ability to change language of all app-localize-behavior instances
mvolkmann Jul 25, 2016
9035757
made several changes suggested by @notwaldorf on 8/29/16
mvolkmann Sep 4, 2016
7547150
changed an event name
mvolkmann Sep 29, 2016
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28 changes: 27 additions & 1 deletion app-localize-behavior.html
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Original file line number Diff line number Diff line change
Expand Up @@ -110,12 +110,30 @@
* @event app-resources-error
*/

/**
* This event is fired when each instance of app-localize-behavior
* is created. It is useful for collecting the instances so that
* later a method can be called on each of them. For an example,
* see demo/app-localize-behavior-mgr.html.
*
* @event app-localize-behavior-ready
*/

/**
* This event is fired every time the language is changed.
* For an example of how this might be used,
* see demo/app-localize-behavior-mgr.html.
*
* @event app-language-changed
*/

properties: {
/**
* The language used for translation.
*/
language: {
type: String
type: String,
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@notwaldorf notwaldorf Sep 6, 2016

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Ah, sorry I missed this the first time around: I don't think you need an observer. You can just add notify: true, and this will fire language-changed

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@mvolkmann mvolkmann Oct 22, 2016

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I tried making that change, but it stops working. I suspect it is because notify is only notifying the parent and this.fire is notifying all ancestors. In my case the event must go beyond the immediate parent.

observer: '__languageChanged'
},

/**
Expand Down Expand Up @@ -194,6 +212,10 @@
}
},

ready() {
this.fire('app-localize-behavior-ready', this);
},

/**
* Returns a computed `localize` method, based on the current `language`.
*/
Expand Down Expand Up @@ -227,6 +249,10 @@
};
},

__languageChanged: function() {
this.fire('app-language-changed', this.language);
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@notwaldorf notwaldorf Aug 29, 2016

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this one too

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@mvolkmann mvolkmann Sep 4, 2016

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Done. Feel free to improve the wording if you feel there is a better description.

},

__onRequestResponse: function(event) {
this.resources = event.response;
this.fire('app-resources-loaded');
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44 changes: 44 additions & 0 deletions demo/app-localize-behavior-mgr.html
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@@ -0,0 +1,44 @@
<link rel="import" href="../../polymer/polymer.html">

<dom-module id="app-localize-behavior-mgr">
<template>
<content></content>
</template>

<script>
Polymer({
is: "app-localize-behavior-mgr",
properties: {
_instances: {
type: Array,
value: function () {
return [];
}
},
_lastLanguage: String
},

listeners: {
'app-localize-behavior-ready': '__addInstance',
'app-language-changed': '__changeLanguage'
},

__addInstance(event) {
this.push('_instances', event.detail);
},

__changeLanguage(event) {
var language = event.detail;
if (language === this._lastLanguage) {
return;
}

this._lastLanguage = language;

this._instances.forEach(function (instance) {
instance.language = language;
});
}
});
</script>
</dom-module>
7 changes: 5 additions & 2 deletions demo/index.html
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Expand Up @@ -20,14 +20,17 @@
<link rel="import" href="../../paper-styles/typography.html">
<link rel="import" href="x-translate.html">
<link rel="import" href="x-local-translate.html">
<link rel="import" href="app-localize-behavior-mgr.html">

<!-- Intl polyfill -->
<script src="../../intl/dist/Intl.min.js"></script>
<script src="../../intl/locale-data/jsonp/en.js"></script>
</head>

<body unresolved>
<x-translate></x-translate>
<x-local-translate></x-local-translate>
<app-localize-behavior-mgr>
<x-translate></x-translate>
<x-local-translate></x-local-translate>
</app-localize-behavior-mgr>
</body>
</html>
7 changes: 6 additions & 1 deletion demo/x-local-translate.html
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Expand Up @@ -47,7 +47,8 @@ <h4>This demo's resources are loaded statically, not from an external file.</h4>
/* Overriden from AppLocalizeBehavior */
language: {
value: 'en',
type: String
type: String,
observer: '_changeLanguage'
},

/* Overriden from AppLocalizeBehavior */
Expand Down Expand Up @@ -76,6 +77,10 @@ <h4>This demo's resources are loaded statically, not from an external file.</h4>
}
},

_changeLanguage() {
this.$.switch.checked = this.language === 'fr';
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@notwaldorf notwaldorf Aug 29, 2016 •
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Isn't this a bit circular? When you flick the toggle, it calls _toggle, which sets this.language, which fires this observer, which re-updates the switch to the same thing? It doesn't look like this is needed.

(same question for x-translate)

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@mvolkmann mvolkmann Sep 4, 2016

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I think this is working as expected. What I am seeing is that manually changing the toggle from the UI triggers a call to _toggle which changes this.language. That triggers the language to be changed in all instances of app-localize-behavior which triggers a call to _changeLanguage in the two demo components. _changeLanguage sets the state of the toggle to match the current language. The key seems to be that doing this does not trigger another call to _toggle, so there is no infinite recursion.

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@notwaldorf notwaldorf Sep 6, 2016

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Got it

},

_toggle: function() {
this.language = this.$.switch.checked ? 'fr' : 'en';
}
Expand Down
7 changes: 6 additions & 1 deletion demo/x-translate.html
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Expand Up @@ -70,7 +70,8 @@ <h4>{{localize('header_2')}}</h4>
/* Overriden from AppLocalizeBehavior */
language: {
value: 'en',
type: String
type: String,
observer: '_changeLanguage'
},

/* Overriden from AppLocalizeBehavior */
Expand All @@ -88,6 +89,10 @@ <h4>{{localize('header_2')}}</h4>
this.loadResources(this.resolveUrl('locales.json'));
},

_changeLanguage() {
this.$.switch.checked = this.language === 'fr';
},

_toggle: function() {
this.language = this.$.switch.checked ? 'fr' : 'en';
}
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2 changes: 0 additions & 2 deletions index.html
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Expand Up @@ -23,8 +23,6 @@

</head>
<body>

<iron-component-page></iron-component-page>

</body>
</html>