spincycle
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A reactive message router and object manager that lets clients subscribe to object property changes on the server
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<!--
@license
Copyright (c) 2016 The Polymer Project Authors. All rights reserved.
This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
Code distributed by Google as part of the polymer project is also
subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
-->
<link rel="import" href="../polymer/polymer.html">
<link rel="import" href="../iron-a11y-keys-behavior/iron-a11y-keys-behavior.html">
<link rel="import" href="../iron-behaviors/iron-button-state.html">
<link rel="import" href="../iron-behaviors/iron-control-state.html">
<link rel="import" href="../iron-form-element-behavior/iron-form-element-behavior.html">
<link rel="import" href="../iron-icon/iron-icon.html">
<link rel="import" href="../iron-validatable-behavior/iron-validatable-behavior.html">
<link rel="import" href="../paper-behaviors/paper-ripple-behavior.html">
<link rel="import" href="../paper-menu-button/paper-menu-button.html">
<link rel="import" href="../paper-styles/default-theme.html">
<link rel="import" href="paper-dropdown-menu-icons.html">
<link rel="import" href="paper-dropdown-menu-shared-styles.html">
<!--
Material design: [Dropdown menus](https://www.google.com/design/spec/components/buttons.html#buttons-dropdown-buttons)
This is a faster, lighter version of `paper-dropdown-menu`, that does not
use a `<paper-input>` internally. Use this element if you're concerned about
the performance of this element, i.e., if you plan on using many dropdowns on
the same page. Note that this element has a slightly different styling API
than `paper-dropdown-menu`.
`paper-dropdown-menu-light` is similar to a native browser select element.
`paper-dropdown-menu-light` works with selectable content. The currently selected
item is displayed in the control. If no item is selected, the `label` is
displayed instead.
Example:
<paper-dropdown-menu-light label="Your favourite pastry">
<paper-listbox class="dropdown-content">
<paper-item>Croissant</paper-item>
<paper-item>Donut</paper-item>
<paper-item>Financier</paper-item>
<paper-item>Madeleine</paper-item>
</paper-listbox>
</paper-dropdown-menu-light>
This example renders a dropdown menu with 4 options.
The child element with the class `dropdown-content` is used as the dropdown
menu. This can be a [`paper-listbox`](paper-listbox), or any other or
element that acts like an [`iron-selector`](iron-selector).
Specifically, the menu child must fire an
[`iron-select`](iron-selector#event-iron-select) event when one of its
children is selected, and an [`iron-deselect`](iron-selector#event-iron-deselect)
event when a child is deselected. The selected or deselected item must
be passed as the event's `detail.item` property.
Applications can listen for the `iron-select` and `iron-deselect` events
to react when options are selected and deselected.
### Styling
The following custom properties and mixins are also available for styling:
Custom property | Description | Default
----------------|-------------|----------
`--paper-dropdown-menu` | A mixin that is applied to the element host | `{}`
`--paper-dropdown-menu-disabled` | A mixin that is applied to the element host when disabled | `{}`
`--paper-dropdown-menu-ripple` | A mixin that is applied to the internal ripple | `{}`
`--paper-dropdown-menu-button` | A mixin that is applied to the internal menu button | `{}`
`--paper-dropdown-menu-icon` | A mixin that is applied to the internal icon | `{}`
`--paper-dropdown-menu-disabled-opacity` | The opacity of the dropdown when disabled | `0.33`
`--paper-dropdown-menu-color` | The color of the input/label/underline when the dropdown is unfocused | `--primary-text-color`
`--paper-dropdown-menu-focus-color` | The color of the label/underline when the dropdown is focused | `--primary-color`
`--paper-dropdown-error-color` | The color of the label/underline when the dropdown is invalid | `--error-color`
`--paper-dropdown-menu-label` | Mixin applied to the label | `{}`
`--paper-dropdown-menu-input` | Mixin appled to the input | `{}`
Note that in this element, the underline is just the bottom border of the "input".
To style it:
<style is=custom-style>
paper-dropdown-menu-light.custom {
--paper-dropdown-menu-input: {
border-bottom: 2px dashed lavender;
};
</style>
@group Paper Elements
@element paper-dropdown-menu-light
@hero hero.svg
@demo demo/index.html
-->
<dom-module id="paper-dropdown-menu-light">
<template>
<style include="paper-dropdown-menu-shared-styles">
:host(:focus) {
outline: none;
}
:host {
width: 200px; /* Default size of an <input> */
}
/**
* All of these styles below are for styling the fake-input display
*/
.dropdown-trigger {
box-sizing: border-box;
position: relative;
width: 100%;
padding: 16px 0 8px 0;
}
:host([disabled]) .dropdown-trigger {
pointer-events: none;
opacity: var(--paper-dropdown-menu-disabled-opacity, 0.33);
}
:host([no-label-float]) .dropdown-trigger {
padding-top: 8px; /* If there's no label, we need less space up top. */
}
#input {
@apply(--paper-font-subhead);
@apply(--paper-font-common-nowrap);
line-height: 1.5;
border-bottom: 1px solid var(--paper-dropdown-menu-color, --secondary-text-color);
color: var(--paper-dropdown-menu-color, --primary-text-color);
width: 100%;
box-sizing: border-box;
padding: 12px 20px 0 0; /* Right padding so that text doesn't overlap the icon */
outline: none;
@apply(--paper-dropdown-menu-input);
}
:host-context([dir="rtl"]) #input {
padding-right: 0px;
padding-left: 20px;
}
:host([disabled]) #input {
border-bottom: 1px dashed var(--paper-dropdown-menu-color, --secondary-text-color);
}
:host([invalid]) #input {
border-bottom: 2px solid var(--paper-dropdown-error-color, --error-color);
}
:host([no-label-float]) #input {
padding-top: 0; /* If there's no label, we need less space up top. */
}
label {
@apply(--paper-font-subhead);
@apply(--paper-font-common-nowrap);
display: block;
position: absolute;
bottom: 0;
left: 0;
right: 0;
/**
* The container has a 16px top padding, and there's 12px of padding
* between the input and the label (from the input's padding-top)
*/
top: 28px;
box-sizing: border-box;
width: 100%;
padding-right: 20px; /* Right padding so that text doesn't overlap the icon */
text-align: left;
transition-duration: .2s;
transition-timing-function: cubic-bezier(.4,0,.2,1);
color: var(--paper-dropdown-menu-color, --secondary-text-color);
@apply(--paper-dropdown-menu-label);
}
:host-context([dir="rtl"]) label {
padding-right: 0px;
padding-left: 20px;
}
:host([no-label-float]) label {
top: 8px;
/* Since the label doesn't need to float, remove the animation duration
which slows down visibility changes (i.e. when a selection is made) */
transition-duration: 0s;
}
label.label-is-floating {
font-size: 12px;
top: 8px;
}
label.label-is-hidden {
visibility: hidden;
}
:host([focused]) label.label-is-floating {
color: var(--paper-dropdown-menu-focus-color, --primary-color);
}
:host([invalid]) label.label-is-floating {
color: var(--paper-dropdown-error-color, --error-color);
}
/**
* Sets up the focused underline. It's initially hidden, and becomes
* visible when it's focused.
*/
label:after {
background-color: var(--paper-dropdown-menu-focus-color, --primary-color);
bottom: 7px; /* The container has an 8px bottom padding */
content: '';
height: 2px;
left: 45%;
position: absolute;
transition-duration: .2s;
transition-timing-function: cubic-bezier(.4,0,.2,1);
visibility: hidden;
width: 8px;
z-index: 10;
}
:host([invalid]) label:after {
background-color: var(--paper-dropdown-error-color, --error-color);
}
:host([no-label-float]) label:after {
bottom: 7px; /* The container has a 8px bottom padding */
}
:host([focused]:not([disabled])) label:after {
left: 0;
visibility: visible;
width: 100%;
}
iron-icon {
position: absolute;
right: 0px;
bottom: 8px; /* The container has an 8px bottom padding */
@apply(--paper-font-subhead);
color: var(--disabled-text-color);
@apply(--paper-dropdown-menu-icon);
}
:host-context([dir="rtl"]) iron-icon {
left: 0;
right: auto;
}
:host([no-label-float]) iron-icon {
margin-top: 0px;
}
.error {
display: inline-block;
visibility: hidden;
color: var(--paper-dropdown-error-color, --error-color);
@apply(--paper-font-caption);
position: absolute;
left:0;
right:0;
bottom: -12px;
}
:host([invalid]) .error {
visibility: visible;
}
</style>
<!-- this div fulfills an a11y requirement for combobox, do not remove -->
<span role="button"></span>
<paper-menu-button
id="menuButton"
vertical-align="[[verticalAlign]]"
horizontal-align="[[horizontalAlign]]"
vertical-offset="[[_computeMenuVerticalOffset(noLabelFloat)]]"
disabled="[[disabled]]"
no-animations="[[noAnimations]]"
on-iron-select="_onIronSelect"
on-iron-deselect="_onIronDeselect"
opened="{{opened}}"
close-on-activate
allow-outside-scroll="[[allowOutsideScroll]]">
<div class="dropdown-trigger">
<label class$="[[_computeLabelClass(noLabelFloat,alwaysFloatLabel,hasContent)]]">
[[label]]
</label>
<div id="input" tabindex="-1"> </div>
<iron-icon icon="paper-dropdown-menu:arrow-drop-down"></iron-icon>
<span class="error">[[errorMessage]]</span>
</div>
<content id="content" select=".dropdown-content"></content>
</paper-menu-button>
</template>
<script>
(function() {
'use strict';
Polymer({
is: 'paper-dropdown-menu-light',
behaviors: [
Polymer.IronButtonState,
Polymer.IronControlState,
Polymer.PaperRippleBehavior,
Polymer.IronFormElementBehavior,
Polymer.IronValidatableBehavior
],
properties: {
/**
* The derived "label" of the currently selected item. This value
* is the `label` property on the selected item if set, or else the
* trimmed text content of the selected item.
*/
selectedItemLabel: {
type: String,
notify: true,
readOnly: true
},
/**
* The last selected item. An item is selected if the dropdown menu has
* a child with class `dropdown-content`, and that child triggers an
* `iron-select` event with the selected `item` in the `detail`.
*
* @type {?Object}
*/
selectedItem: {
type: Object,
notify: true,
readOnly: true
},
/**
* The value for this element that will be used when submitting in
* a form. It is read only, and will always have the same value
* as `selectedItemLabel`.
*/
value: {
type: String,
notify: true,
readOnly: true,
observer: '_valueChanged',
},
/**
* The label for the dropdown.
*/
label: {
type: String
},
/**
* The placeholder for the dropdown.
*/
placeholder: {
type: String
},
/**
* True if the dropdown is open. Otherwise, false.
*/
opened: {
type: Boolean,
notify: true,
value: false,
observer: '_openedChanged'
},
/**
* By default, the dropdown will constrain scrolling on the page
* to itself when opened.
* Set to true in order to prevent scroll from being constrained
* to the dropdown when it opens.
*/
allowOutsideScroll: {
type: Boolean,
value: false
},
/**
* Set to true to disable the floating label. Bind this to the
* `<paper-input-container>`'s `noLabelFloat` property.
*/
noLabelFloat: {
type: Boolean,
value: false,
reflectToAttribute: true
},
/**
* Set to true to always float the label. Bind this to the
* `<paper-input-container>`'s `alwaysFloatLabel` property.
*/
alwaysFloatLabel: {
type: Boolean,
value: false
},
/**
* Set to true to disable animations when opening and closing the
* dropdown.
*/
noAnimations: {
type: Boolean,
value: false
},
/**
* The orientation against which to align the menu dropdown
* horizontally relative to the dropdown trigger.
*/
horizontalAlign: {
type: String,
value: 'right'
},
/**
* The orientation against which to align the menu dropdown
* vertically relative to the dropdown trigger.
*/
verticalAlign: {
type: String,
value: 'top'
},
hasContent: {
type: Boolean,
readOnly: true
}
},
listeners: {
'tap': '_onTap'
},
keyBindings: {
'up down': 'open',
'esc': 'close'
},
hostAttributes: {
tabindex: 0,
role: 'combobox',
'aria-autocomplete': 'none',
'aria-haspopup': 'true'
},
observers: [
'_selectedItemChanged(selectedItem)'
],
attached: function() {
// NOTE(cdata): Due to timing, a preselected value in a `IronSelectable`
// child will cause an `iron-select` event to fire while the element is
// still in a `DocumentFragment`. This has the effect of causing
// handlers not to fire. So, we double check this value on attached:
var contentElement = this.contentElement;
if (contentElement && contentElement.selectedItem) {
this._setSelectedItem(contentElement.selectedItem);
}
},
/**
* The content element that is contained by the dropdown menu, if any.
*/
get contentElement() {
return Polymer.dom(this.$.content).getDistributedNodes()[0];
},
/**
* Show the dropdown content.
*/
open: function() {
this.$.menuButton.open();
},
/**
* Hide the dropdown content.
*/
close: function() {
this.$.menuButton.close();
},
/**
* A handler that is called when `iron-select` is fired.
*
* @param {CustomEvent} event An `iron-select` event.
*/
_onIronSelect: function(event) {
this._setSelectedItem(event.detail.item);
},
/**
* A handler that is called when `iron-deselect` is fired.
*
* @param {CustomEvent} event An `iron-deselect` event.
*/
_onIronDeselect: function(event) {
this._setSelectedItem(null);
},
/**
* A handler that is called when the dropdown is tapped.
*
* @param {CustomEvent} event A tap event.
*/
_onTap: function(event) {
if (Polymer.Gestures.findOriginalTarget(event) === this) {
this.open();
}
},
/**
* Compute the label for the dropdown given a selected item.
*
* @param {Element} selectedItem A selected Element item, with an
* optional `label` property.
*/
_selectedItemChanged: function(selectedItem) {
var value = '';
if (!selectedItem) {
value = '';
} else {
value = selectedItem.label || selectedItem.getAttribute('label') || selectedItem.textContent.trim();
}
this._setValue(value);
this._setSelectedItemLabel(value);
},
/**
* Compute the vertical offset of the menu based on the value of
* `noLabelFloat`.
*
* @param {boolean} noLabelFloat True if the label should not float
* above the input, otherwise false.
*/
_computeMenuVerticalOffset: function(noLabelFloat) {
// NOTE(cdata): These numbers are somewhat magical because they are
// derived from the metrics of elements internal to `paper-input`'s
// template. The metrics will change depending on whether or not the
// input has a floating label.
return noLabelFloat ? -4 : 8;
},
/**
* Returns false if the element is required and does not have a selection,
* and true otherwise.
* @param {*=} _value Ignored.
* @return {boolean} true if `required` is false, or if `required` is true
* and the element has a valid selection.
*/
_getValidity: function(_value) {
return this.disabled || !this.required || (this.required && !!this.value);
},
_openedChanged: function() {
var openState = this.opened ? 'true' : 'false';
var e = this.contentElement;
if (e) {
e.setAttribute('aria-expanded', openState);
}
},
_computeLabelClass: function(noLabelFloat, alwaysFloatLabel, hasContent) {
var cls = '';
if (noLabelFloat === true) {
return hasContent ? 'label-is-hidden' : '';
}
if (hasContent || alwaysFloatLabel === true) {
cls += ' label-is-floating';
}
return cls;
},
_valueChanged: function() {
// Only update if it's actually different.
if (this.$.input && this.$.input.textContent !== this.value) {
this.$.input.textContent = this.value;
}
this._setHasContent(!!this.value);
},
});
})();
</script>
</dom-module>