c5169e0e
 Renato De Donato
a new hope
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<script>
(function() {
Polymer({
is: 'iron-doc-property',
properties: {
/**
* The [Hydrolysis](https://github.com/PolymerLabs/hydrolysis)-generated
* element descriptor to display details for.
*
* Alternatively, the element descriptor can be provided as JSON via the text content
* of this element.
*
* @type {hydrolysis.PropertyDescriptor}
*/
descriptor: {
type: Object,
observer: '_descriptorChanged',
},
/**
* Whether the property should show a one-liner, or full summary.
*
* Note that this property _is_ reflected as an attribute, but we perform
* the reflection manually. In order to support the CSS transitions, we
* must calculate the element height before setting the attribute.
*/
collapsed: {
type: Boolean,
value: false,
observer: '_collapsedChanged',
},
},
listeners: {
'transitionEnd': '_onTransitionEnd',
'webkitTransitionEnd': '_onTransitionEnd',
},
ready: function() {
this._isReady = true;
},
/**
* Resets any state that was set up for transitions.
*
* We are careful to reset our explicit heights after a transition
* completes, so that the property doesn't clip values if the user resizes
* their viewport.
*/
_onTransitionEnd: function(event) {
if (event.path[0] !== this.$.transitionMask) return;
this.$.transitionMask.style.height = '';
},
_descriptorChanged: function() {
this.toggleAttribute('private', this.descriptor.private);
this.toggleAttribute('configuration', this.descriptor.configuration);
this.toggleAttribute('function', this.descriptor.function);
this._paramText = (this.descriptor.params || []).map(function(param) {
return param.name;
}).join(', ');
},
/**
* Reflects `collapsed` as the `_collapsed` attribute.
*
* "Why not use `reflectToAttribute: true`?", you ask? A fine question!
*
* We avoid simple reflection purely because there is no purely declarative
* way of transitioning to/from `height: auto`. This callback manages
* setting explicit heights for the property so that CSS can interpolate it.
*
* @see #_onTransitionEnd
*/
_collapsedChanged: function() {
if (!this._isReady) {
this.toggleAttribute('_collapsed', this.collapsed);
return;
}
var container = this.$.transitionMask;
var collapsed = this.collapsed;
// Measure `height: auto`, which we will need regardless of transition
// direction. We assume that the collapsed state has an explicit height
// set via CSS rules; so we do not bother measuring that.
container.style.height = 'auto';
var fullHeight = container.offsetHeight;
// Then, we reset to the start state. Changing directions mid-transition
// is _not_ supported!
if (this.collapsed) {
container.style.height = fullHeight + 'px'; // Height 'auto'.
} else {
container.style.height = ''; // Height specified by CSS rule.
}
// We must wait a frame so that the transition engine has a chance to know
// that something actually changed.
requestAnimationFrame(function() {
this.toggleAttribute('_collapsed', collapsed);
if (this.collapsed) {
container.style.height = ''; // Height specified by CSS rule.
} else {
container.style.height = fullHeight + 'px'; // Height 'auto'.
}
}.bind(this));
},
// hidden if no type and no defaults
_computeHideMeta: function(descriptor) {
return descriptor.type === undefined && descriptor.default === undefined;
},
// hidden if no params, and no return value
_computeHideParams: function(descriptor,ret) {
return (!descriptor.params || descriptor.params.length === 0) && !ret;
},
_computeHideDefault: function(def) {
return def === undefined;
},
_computeDefaultDisplay: function(def) {
if (def === '')
return "''";
return def;
}
});
})();
</script>
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