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paper-header-panel.js
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paper-header-panel.js
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/**
@license
Copyright (c) 2015 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
*/
import '@polymer/polymer/polymer-legacy.js';
import '@polymer/iron-flex-layout/iron-flex-layout.js';
import {Polymer} from '@polymer/polymer/lib/legacy/polymer-fn.js';
import {dom} from '@polymer/polymer/lib/legacy/polymer.dom.js';
import {html} from '@polymer/polymer/lib/utils/html-tag.js';
var SHADOW_WHEN_SCROLLING = 1;
var SHADOW_ALWAYS = 2;
var MODE_CONFIGS = {
outerScroll: {'scroll': true},
shadowMode: {
'standard': SHADOW_ALWAYS,
'waterfall': SHADOW_WHEN_SCROLLING,
'waterfall-tall': SHADOW_WHEN_SCROLLING
},
tallMode: {'waterfall-tall': true}
};
/**
**This element has been deprecated in favor of
[app-layout](https://github.com/PolymerElements/app-layout).**
`paper-header-panel` contains a header section and a content panel section.
__Important:__ The `paper-header-panel` will not display if its parent does not
have a height.
Using layout classes, you can make the `paper-header-panel` fill the screen
<body class="fullbleed layout vertical">
<paper-header-panel class="flex">
<paper-toolbar slot="header">
<div>Hello World!</div>
</paper-toolbar>
</paper-header-panel>
</body>
Special support is provided for scrolling modes when one uses a paper-toolbar or
equivalent for the header section.
Example:
<paper-header-panel>
<paper-toolbar slot="header">Header</paper-toolbar>
<div>Content goes here...</div>
</paper-header-panel>
To have the content fit to the main area, use the `fit` class.
Example:
<paper-header-panel>
<div slot="header">standard</div>
<div class="fit">content fits 100% below the header</div>
</paper-header-panel>
### Modes
Controls header and scrolling behavior. Options are `standard`, `seamed`,
`waterfall`, `waterfall-tall`, `scroll` and `cover`. Default is `standard`.
Mode | Description
----------------|-------------
`standard` | The header is a step above the panel. The header will consume the panel at the point of entry, preventing it from passing through to the opposite side.
`seamed` | The header is presented as seamed with the panel.
`waterfall` | Similar to standard mode, but header is initially presented as seamed with panel, but then separates to form the step.
`waterfall-tall` | The header is initially taller (`tall` class is added to the header). As the user scrolls, the header separates (forming an edge) while condensing (`tall` class is removed from the header).
`scroll` | The header keeps its seam with the panel, and is pushed off screen.
`cover` | The panel covers the whole `paper-header-panel` including the header. This allows user to style the panel in such a way that the panel is partially covering the header.
### Styling
To change the shadow that shows up underneath the header:
paper-header-panel {
--paper-header-panel-shadow: {
height: 6px;
bottom: -6px;
box-shadow: inset 0px 5px 6px -3px rgba(0, 0, 0, 0.4);
};
}
To change the panel container:
paper-header-panel {
--paper-header-panel-container: {
border: 1px solid gray;
};
To change the panel container in different modes:
paper-header-panel {
--paper-header-panel-standard-container: {
border: 1px solid gray;
};
--paper-header-panel-seamed-container: {
border: 1px solid gray;
};
--paper-header-panel-waterfall-container: {
border: 1px solid gray;
};
--paper-header-panel-waterfall-tall-container: {
border: 1px solid gray;
};
--paper-header-panel-scroll-container: {
border: 1px solid gray;
};
--paper-header-panel-cover-container: {
border: 1px solid gray;
};
}
The following custom properties and mixins are available for styling:
Custom property | Description | Default
----------------|-------------|----------
`--paper-header-panel` | Mixin applied to the element | `{}`
`--paper-header-panel-body` | Mixin applied to the element's body (i.e. everything below the toolbar) | `{}`
`--paper-header-panel-container` | Mixin applied to the container in any mode | `{}`
`--paper-header-panel-scroll-container` | Mixin applied to the container when in scroll mode | `{}`
`--paper-header-panel-cover-container` | Mixin applied to the container when in cover mode | `{}`
`--paper-header-panel-standard-container` | Mixin applied to the container when in standard mode | `{}`
`--paper-header-panel-seamed-container` | Mixin applied to the container when in seamed mode | `{}`
`--paper-header-panel-waterfall-container` | Mixin applied to the container when in waterfall mode | `{}`
`--paper-header-panel-waterfall-tall-container` | Mixin applied to the container when in tall waterfall mode | `{}`
`--paper-header-panel-shadow` | Mixin applied to the waterfall shadow | `{}`
@element paper-header-panel
@demo demo/index.html
*/
Polymer({
/** @override */
_template: html`
<style>
:host {
@apply --layout-vertical;
position: relative;
height: 100%;
@apply --paper-header-panel;
}
#mainContainer {
@apply --layout-flex;
position: relative;
overflow-y: auto;
overflow-x: hidden;
-webkit-overflow-scrolling: touch;
}
#mainPanel {
@apply --layout-vertical;
@apply --layout-flex;
position: relative;
min-height: 0;
@apply --paper-header-panel-body;
}
#mainContainer {
@apply --paper-header-panel-container;
}
/*
* mode: scroll
*/
:host([mode=scroll]) #mainContainer {
@apply --paper-header-panel-scroll-container;
overflow: visible;
}
:host([mode=scroll]) {
overflow-y: auto;
overflow-x: hidden;
-webkit-overflow-scrolling: touch;
}
/*
* mode: cover
*/
:host([mode=cover]) #mainContainer {
@apply --paper-header-panel-cover-container;
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
}
:host([mode=cover]) #mainPanel {
position: static;
}
/*
* mode: standard
*/
:host([mode=standard]) #mainContainer {
@apply --paper-header-panel-standard-container;
}
/*
* mode: seamed
*/
:host([mode=seamed]) #mainContainer {
@apply --paper-header-panel-seamed-container;
}
/*
* mode: waterfall
*/
:host([mode=waterfall]) #mainContainer {
@apply --paper-header-panel-waterfall-container;
}
/*
* mode: waterfall-tall
*/
:host([mode=waterfall-tall]) #mainContainer {
@apply --paper-header-panel-waterfall-tall-container;
}
#dropShadow {
transition: opacity 0.5s;
height: 6px;
box-shadow: inset 0px 5px 6px -3px rgba(0, 0, 0, 0.4);
@apply --paper-header-panel-shadow;
position: absolute;
top: 0;
left: 0;
right: 0;
opacity: 0;
pointer-events: none;
}
#dropShadow.has-shadow {
opacity: 1;
}
#mainContainer > ::slotted(.fit) {
@apply --layout-fit;
}
</style>
<slot id="headerSlot" name="header"></slot>
<div id="mainPanel">
<div id="mainContainer" class$="[[_computeMainContainerClass(mode)]]">
<slot></slot>
</div>
<div id="dropShadow"></div>
</div>
`,
is: 'paper-header-panel',
/**
* Fired when the content has been scrolled. `event.detail.target` returns
* the scrollable element which you can use to access scroll info such as
* `scrollTop`.
*
* <paper-header-panel on-content-scroll="scrollHandler">
* ...
* </paper-header-panel>
*
*
* scrollHandler: function(event) {
* var scroller = event.detail.target;
* console.log(scroller.scrollTop);
* }
*
* @event content-scroll
*/
properties: {
/**
* Controls header and scrolling behavior. Options are
* `standard`, `seamed`, `waterfall`, `waterfall-tall`, `scroll` and
* `cover`. Default is `standard`.
*
* `standard`: The header is a step above the panel. The header will consume
* the panel at the point of entry, preventing it from passing through to
* the opposite side.
*
* `seamed`: The header is presented as seamed with the panel.
*
* `waterfall`: Similar to standard mode, but header is initially presented
* as seamed with panel, but then separates to form the step.
*
* `waterfall-tall`: The header is initially taller (`tall` class is added
* to the header). As the user scrolls, the header separates (forming an
* edge) while condensing (`tall` class is removed from the header).
*
* `scroll`: The header keeps its seam with the panel, and is pushed off
* screen.
*
* `cover`: The panel covers the whole `paper-header-panel` including the
* header. This allows user to style the panel in such a way that the panel
* is partially covering the header.
*
* <paper-header-panel mode="cover">
* <paper-toolbar slot="header" class="tall">
* <paper-icon-button icon="menu"></paper-icon-button>
* </paper-toolbar>
* <div></div>
* </paper-header-panel>
*/
mode: {
type: String,
value: 'standard',
observer: '_modeChanged',
reflectToAttribute: true
},
/**
* If true, the drop-shadow is always shown no matter what mode is set to.
*/
shadow: {type: Boolean, value: false},
/**
* The class used in waterfall-tall mode. Change this if the header
* accepts a different class for toggling height, e.g. "medium-tall"
*/
tallClass: {type: String, value: 'tall'},
/**
* If true, the scroller is at the top
*/
atTop: {
type: Boolean,
value: true,
notify: true,
readOnly: true,
reflectToAttribute: true
}
},
observers: ['_computeDropShadowHidden(atTop, mode, shadow)'],
/** @override */
attached: function() {
this._addListener();
// Run `scroll` logic once to initialize class names, etc.
this._keepScrollingState();
},
/** @override */
detached: function() {
this._removeListener();
},
/** @override */
ready: function() {
this.scrollHandler = this._scroll.bind(this);
console.warn(this.is, 'is deprecated. Please use app-layout instead!');
},
/**
* Returns the header element
* @return {!Element|undefined}
*/
get header() {
var header = dom(this.$.headerSlot).getDistributedNodes()[0];
if (!header) {
return undefined;
}
return /** @type {!Element}*/ (header);
},
/**
* Returns the scrollable element.
* @return {!HTMLElement}
*/
get scroller() {
return this._getScrollerForMode(this.mode);
},
/**
* Returns true if the scroller has a visible shadow.
* @return {boolean}
*/
get visibleShadow() {
return this.$.dropShadow.classList.contains('has-shadow');
},
_computeDropShadowHidden: function(atTop, mode, shadow) {
var shadowMode = MODE_CONFIGS.shadowMode[mode];
if (this.shadow) {
this.toggleClass('has-shadow', true, this.$.dropShadow);
} else if (shadowMode === SHADOW_ALWAYS) {
this.toggleClass('has-shadow', true, this.$.dropShadow);
} else if (shadowMode === SHADOW_WHEN_SCROLLING && !atTop) {
this.toggleClass('has-shadow', true, this.$.dropShadow);
} else {
this.toggleClass('has-shadow', false, this.$.dropShadow);
}
},
_computeMainContainerClass: function(mode) {
// TODO: It will be useful to have a utility for classes
// e.g. Polymer.Utils.classes({ foo: true });
var classes = {};
classes['flex'] = mode !== 'cover';
return Object.keys(classes)
.filter(function(className) {
return classes[className];
})
.join(' ');
},
_addListener: function() {
this.scroller.addEventListener('scroll', this.scrollHandler);
},
_removeListener: function() {
this.scroller.removeEventListener('scroll', this.scrollHandler);
},
_modeChanged: function(newMode, oldMode) {
var configs = MODE_CONFIGS;
var header = this.header;
var animateDuration = 200;
if (header) {
// in tallMode it may add tallClass to the header; so do the cleanup
// when mode is changed from tallMode to not tallMode
if (configs.tallMode[oldMode] && !configs.tallMode[newMode]) {
header.classList.remove(this.tallClass);
this.async(function() {
header.classList.remove('animate');
}, animateDuration);
} else {
this.toggleClass('animate', configs.tallMode[newMode], header);
}
}
this._keepScrollingState();
},
_keepScrollingState: function() {
var main = this.scroller;
var header = this.header;
this._setAtTop(main.scrollTop === 0);
if (header && this.tallClass && MODE_CONFIGS.tallMode[this.mode]) {
this.toggleClass(
this.tallClass,
this.atTop ||
header.classList.contains(this.tallClass) &&
main.scrollHeight < this.offsetHeight,
header);
}
},
_scroll: function() {
this._keepScrollingState();
this.fire('content-scroll', {target: this.scroller}, {bubbles: false});
},
_getScrollerForMode: function(mode) {
return MODE_CONFIGS.outerScroll[mode] ? this : this.$.mainContainer;
}
});