mirror of
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510 lines
13 KiB
HTML
510 lines
13 KiB
HTML
<!--
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@license
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Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
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This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
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The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
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The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
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Code distributed by Google as part of the polymer project is also
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subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
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-->
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<link rel="import" href="../polymer/polymer.html">
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<link rel="import" href="../paper-styles/paper-styles.html">
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<link rel="import" href="../paper-progress/paper-progress.html">
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<link rel="import" href="../paper-input/paper-input.html">
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<link rel="import" href="../paper-behaviors/paper-inky-focus-behavior.html">
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<link rel="import" href="../paper-ripple/paper-ripple.html">
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<link rel="import" href="../iron-a11y-keys-behavior/iron-a11y-keys-behavior.html">
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<link rel="import" href="../iron-range-behavior/iron-range-behavior.html">
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<link rel="import" href="../iron-form-element-behavior/iron-form-element-behavior.html">
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<!--
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`paper-slider` allows user to select a value from a range of values by
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moving the slider thumb. The interactive nature of the slider makes it a
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great choice for settings that reflect intensity levels, such as volume,
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brightness, or color saturation.
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Example:
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<paper-slider></paper-slider>
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Use `min` and `max` to specify the slider range. Default is 0 to 100.
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Example:
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<paper-slider min="10" max="200" value="110"></paper-slider>
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### Styling
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The following custom properties and mixins are available for styling:
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Custom property | Description | Default
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----------------|-------------|----------
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`--paper-slider-bar-color` | The background color of the slider | `transparent`
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`--paper-slider-active-color` | The progress bar color | `--google-blue-700`
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`--paper-slider-secondary-color` | The secondary progress bar color | `--google-blue-300`
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`--paper-slider-knob-color` | The knob color | `--google-blue-700`
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`--paper-slider-disabled-knob-color` | The disabled knob color | `--google-grey-500`
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`--paper-slider-pin-color` | The pin color | `--google-blue-700`
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`--paper-slider-font-color` | The pin's text color | `#fff`
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`--paper-slider-disabled-active-color` | The disabled progress bar color | `--google-grey-500`
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`--paper-slider-disabled-secondary-color` | The disabled secondary progress bar color | `--google-grey-300`
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`--paper-slider-knob-start-color` | The fill color of the knob at the far left | `transparent`
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`--paper-slider-knob-start-border-color` | The border color of the knob at the far left | `#c8c8c8`
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`--paper-slider-pin-start-color` | The color of the pin at the far left | `#c8c8c8`
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@group Paper Elements
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@element paper-slider
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@demo demo/index.html
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@hero hero.svg
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-->
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<dom-module id="paper-slider">
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<link rel="import" type="css" href="paper-slider.css">
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<template>
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<div id="sliderContainer"
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class$="[[_getClassNames(disabled, pin, snaps, immediateValue, min, expand, dragging, transiting, editable)]]">
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<div class="bar-container">
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<paper-progress
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class$="[[_getProgressClass(transiting)]]"
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id="sliderBar"
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aria-hidden="true"
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min="[[min]]"
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max="[[max]]"
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step="[[step]]"
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value="[[immediateValue]]"
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secondary-progress="[[secondaryProgress]]"
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on-down="_bardown"
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on-up="_resetKnob"
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on-track="_onTrack">
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</paper-progress>
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</div>
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<template is="dom-if" if="[[snaps]]">
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<div class="slider-markers horizontal layout">
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<template is="dom-repeat" items="[[markers]]">
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<div class="slider-marker flex"></div>
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</template>
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</div>
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</template>
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<div id="sliderKnob"
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class="center-justified center horizontal layout"
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on-down="_knobdown"
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on-up="_resetKnob"
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on-track="_onTrack"
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on-transitionend="_knobTransitionEnd">
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<paper-ripple
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center
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id="ink"
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class="circle"
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hidden$="[[!receivedFocusFromKeyboard]]">
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</paper-ripple>
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<div id="sliderKnobInner" value$="[[pinValue]]"></div>
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</div>
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</div>
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<template is="dom-if" if="[[editable]]">
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<paper-input
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id="input"
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class="slider-input"
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disabled$="[[disabled]]"
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on-change="_inputChange"
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value="[[_fixForInput(immediateValue)]]"
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>
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</paper-input>
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</template>
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</template>
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</dom-module>
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<script>
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Polymer({
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is: 'paper-slider',
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behaviors: [
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Polymer.IronFormElementBehavior,
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Polymer.PaperInkyFocusBehavior,
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Polymer.IronRangeBehavior
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],
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properties: {
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/**
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* If true, the slider thumb snaps to tick marks evenly spaced based
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* on the `step` property value.
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*/
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snaps: {
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type: Boolean,
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value: false,
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notify: true
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},
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/**
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* If true, a pin with numeric value label is shown when the slider thumb
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* is pressed. Use for settings for which users need to know the exact
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* value of the setting.
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*/
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pin: {
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type: Boolean,
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value: false,
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notify: true
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},
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/**
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* The number that represents the current secondary progress.
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*/
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secondaryProgress: {
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type: Number,
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value: 0,
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notify: true,
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observer: '_secondaryProgressChanged'
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},
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/**
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* If true, an input is shown and user can use it to set the slider value.
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*/
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editable: {
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type: Boolean,
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value: false
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},
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/**
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* The immediate value of the slider. This value is updated while the user
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* is dragging the slider.
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*/
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immediateValue: {
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type: Number,
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value: 0,
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readOnly: true
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},
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/**
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* The maximum number of markers
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*/
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maxMarkers: {
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type: Number,
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value: 0,
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notify: true,
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observer: '_maxMarkersChanged'
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},
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/**
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* If true, the knob is expanded
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*/
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expand: {
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type: Boolean,
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value: false,
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readOnly: true
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},
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/**
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* True when the user is dragging the slider.
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*/
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dragging: {
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type: Boolean,
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value: false,
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readOnly: true
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},
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transiting: {
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type: Boolean,
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value: false,
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readOnly: true
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},
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markers: {
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type: Array,
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readOnly: true,
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value: []
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},
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},
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observers: [
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'_updateKnob(value, min, max, snaps, step)',
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'_minChanged(min)',
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'_maxChanged(max)',
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'_valueChanged(value)',
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'_immediateValueChanged(immediateValue)'
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],
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hostAttributes: {
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role: 'slider',
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tabindex: 0
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},
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keyBindings: {
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'left down pagedown home': '_decrementKey',
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'right up pageup end': '_incrementKey'
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},
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ready: function() {
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// issue polymer/polymer#1305
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this.async(function() {
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this._updateKnob(this.value);
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}, 1);
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},
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/**
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* Increases value by `step` but not above `max`.
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* @method increment
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*/
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increment: function() {
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this.value = this._clampValue(this.value + this.step);
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},
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/**
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* Decreases value by `step` but not below `min`.
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* @method decrement
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*/
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decrement: function() {
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this.value = this._clampValue(this.value - this.step);
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},
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_updateKnob: function(value) {
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this._positionKnob(this._calcRatio(value));
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},
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_minChanged: function() {
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this.setAttribute('aria-valuemin', this.min);
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},
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_maxChanged: function() {
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this.setAttribute('aria-valuemax', this.max);
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},
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_valueChanged: function() {
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this.setAttribute('aria-valuenow', this.value);
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this.fire('value-change');
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},
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_immediateValueChanged: function() {
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if (this.dragging) {
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this.fire('immediate-value-change');
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} else {
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this.value = this.immediateValue;
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}
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},
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_secondaryProgressChanged: function() {
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this.secondaryProgress = this._clampValue(this.secondaryProgress);
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},
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_fixForInput: function(immediateValue) {
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// paper-input/issues/114
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return this.immediateValue.toString();
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},
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_expandKnob: function() {
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this._setExpand(true);
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},
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_resetKnob: function() {
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this.cancelDebouncer('expandKnob');
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this._setExpand(false);
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},
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_positionKnob: function(ratio) {
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this._setImmediateValue(this._calcStep(this._calcKnobPosition(ratio)));
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this._setPinValue(this.immediateValue);
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this._setRatio(this._calcRatio(this.immediateValue));
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this.$.sliderKnob.style.left = (this.ratio * 100) + '%';
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},
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_inputChange: function() {
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this.value = this.$$('#input').value;
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this.fire('change');
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},
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_calcKnobPosition: function(ratio) {
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return (this.max - this.min) * ratio + this.min;
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},
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_onTrack: function(event) {
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event.stopPropagation();
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switch (event.detail.state) {
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case 'start':
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this._trackStart(event);
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break;
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case 'track':
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this._trackX(event);
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break;
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case 'end':
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this._trackEnd();
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break;
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}
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},
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_trackStart: function(event) {
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this._w = this.$.sliderBar.offsetWidth;
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this._x = this.ratio * this._w;
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this._startx = this._x || 0;
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this._minx = - this._startx;
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this._maxx = this._w - this._startx;
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this.$.sliderKnob.classList.add('dragging');
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this._setDragging(true);
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},
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_trackX: function(e) {
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if (!this.dragging) {
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this._trackStart(e);
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}
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var dx = Math.min(this._maxx, Math.max(this._minx, e.detail.dx));
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this._x = this._startx + dx;
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var immediateValue = this._calcStep(this._calcKnobPosition(this._x / this._w));
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this._setImmediateValue(immediateValue);
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// update knob's position
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var translateX = ((this._calcRatio(immediateValue) * this._w) - this._startx);
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this.translate3d(translateX + 'px', 0, 0, this.$.sliderKnob);
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this._setPinValue(immediateValue);
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},
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_trackEnd: function() {
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var s = this.$.sliderKnob.style;
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this.$.sliderKnob.classList.remove('dragging');
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this._setDragging(false);
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this._resetKnob();
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this.value = this.immediateValue;
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s.transform = s.webkitTransform = '';
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this.fire('change');
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},
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_knobdown: function(event) {
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this._expandKnob();
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// cancel selection
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event.preventDefault();
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// set the focus manually because we will called prevent default
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this.focus();
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},
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_bardown: function(event) {
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this._w = this.$.sliderBar.offsetWidth;
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var rect = this.$.sliderBar.getBoundingClientRect();
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var ratio = (event.detail.x - rect.left) / this._w;
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var prevRatio = this.ratio;
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this._setTransiting(true);
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this._positionKnob(ratio);
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this.debounce('expandKnob', this._expandKnob, 60);
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// if the ratio doesn't change, sliderKnob's animation won't start
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// and `_knobTransitionEnd` won't be called
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// Therefore, we need to manually update the `transiting` state
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if (prevRatio === this.ratio) {
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this._setTransiting(false);
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}
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this.async(function() {
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this.fire('change');
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});
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// cancel selection
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event.preventDefault();
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},
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_knobTransitionEnd: function(event) {
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if (event.target === this.$.sliderKnob) {
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this._setTransiting(false);
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}
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},
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_maxMarkersChanged: function(maxMarkers) {
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var l = (this.max - this.min) / this.step;
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if (!this.snaps && l > maxMarkers) {
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this._setMarkers([]);
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} else {
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this._setMarkers(new Array(l));
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}
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},
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_mergeClasses: function(classes) {
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return Object.keys(classes).filter(
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function(className) {
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return classes[className];
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}).join(' ');
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},
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_getClassNames: function() {
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var classes = {};
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classes.disabled = this.disabled;
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classes.pin = this.pin;
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classes.snaps = this.snaps;
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classes.ring = this.immediateValue <= this.min;
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classes.expand = this.expand;
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classes.dragging = this.dragging;
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classes.transiting = this.transiting;
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classes.editable = this.editable;
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return this._mergeClasses(classes);
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},
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_getProgressClass: function() {
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return this._mergeClasses({
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transiting: this.transiting
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});
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},
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_incrementKey: function(event) {
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if (event.detail.key === 'end') {
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this.value = this.max;
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} else {
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this.increment();
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}
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this.fire('change');
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},
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_decrementKey: function(event) {
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if (event.detail.key === 'home') {
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this.value = this.min;
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} else {
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this.decrement();
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}
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this.fire('change');
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},
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_setPinValue: function (value) {
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this.pinValue = value;
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}
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});
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/**
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* Fired when the slider's value changes.
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*
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* @event value-change
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*/
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/**
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* Fired when the slider's immediateValue changes.
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*
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* @event immediate-value-change
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*/
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/**
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* Fired when the slider's value changes due to user interaction.
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*
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* Changes to the slider's value due to changes in an underlying
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* bound variable will not trigger this event.
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*
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* @event change
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*/
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</script>
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