android13/external/chromium-trace/catapult/third_party/polymer/components/paper-item

Demo and API docs

##<paper-item>

Material design: Lists

<paper-item> is an interactive list item. By default, it is a horizontal flexbox.

<paper-item>Item</paper-item>

Use this element with <paper-item-body> to make Material Design styled two-line and three-line items.

<paper-item>
  <paper-item-body two-line>
    <div>Show your status</div>
    <div secondary>Your status is visible to everyone</div>
  </paper-item-body>
  <iron-icon icon="warning"></iron-icon>
</paper-item>

To use paper-item as a link, wrap it in an anchor tag. Since paper-item will already receive focus, you may want to prevent the anchor tag from receiving focus as well by setting its tabindex to -1.

<a href="https://www.polymer-project.org/" tabindex="-1">
  <paper-item raised>Polymer Project</paper-item>
</a>

If you are concerned about performance and want to use paper-item in a paper-listbox with many items, you can just use a native button with the paper-item class applied (provided you have correctly included the shared styles):

<style is="custom-style" include="paper-item-shared-styles"></style>

<paper-listbox>
  <button class="paper-item" role="option">Inbox</button>
  <button class="paper-item" role="option">Starred</button>
  <button class="paper-item" role="option">Sent mail</button>
</paper-listbox>

Styling

The following custom properties and mixins are available for styling:

Custom property	Description	Default
--paper-item-min-height	Minimum height of the item	48px
--paper-item	Mixin applied to the item	{}
--paper-item-selected-weight	The font weight of a selected item	bold
--paper-item-selected	Mixin applied to selected paper-items	{}
--paper-item-disabled-color	The color for disabled paper-items	--disabled-text-color
--paper-item-disabled	Mixin applied to disabled paper-items	{}
--paper-item-focused	Mixin applied to focused paper-items	{}
--paper-item-focused-before	Mixin applied to :before focused paper-items	{}

Accessibility

This element has role="listitem" by default. Depending on usage, it may be more appropriate to set role="menuitem", role="menuitemcheckbox" or role="menuitemradio".

<paper-item role="menuitemcheckbox">
  <paper-item-body>
    Show your status
  </paper-item-body>
  <paper-checkbox></paper-checkbox>
</paper-item>

##<paper-icon-item>

<paper-icon-item> is a convenience element to make an item with icon. It is an interactive list item with a fixed-width icon area, according to Material Design. This is useful if the icons are of varying widths, but you want the item bodies to line up. Use this like a <paper-item>. The child node with the attribute item-icon is placed in the icon area.

<paper-icon-item>
  <iron-icon icon="favorite" item-icon></iron-icon>
  Favorite
</paper-icon-item>
<paper-icon-item>
  <div class="avatar" item-icon></div>
  Avatar
</paper-icon-item>

Styling

The following custom properties and mixins are available for styling:

Custom property	Description	Default
--paper-item-icon-width	Width of the icon area	56px
--paper-item-icon	Mixin applied to the icon area	{}
--paper-icon-item	Mixin applied to the item	{}
--paper-item-selected-weight	The font weight of a selected item	bold
--paper-item-selected	Mixin applied to selected paper-items	{}
--paper-item-disabled-color	The color for disabled paper-items	--disabled-text-color
--paper-item-disabled	Mixin applied to disabled paper-items	{}
--paper-item-focused	Mixin applied to focused paper-items	{}
--paper-item-focused-before	Mixin applied to :before focused paper-items	{}

##<paper-item-body>

Use <paper-item-body> in a <paper-item> or <paper-icon-item> to make two- or three- line items. It is a flex item that is a vertical flexbox.

<paper-item>
  <paper-item-body two-line>
    <div>Show your status</div>
    <div secondary>Your status is visible to everyone</div>
  </paper-item-body>
</paper-item>

The child elements with the secondary attribute is given secondary text styling.

Styling

The following custom properties and mixins are available for styling:

Custom property	Description	Default
--paper-item-body-two-line-min-height	Minimum height of a two-line item	72px
--paper-item-body-three-line-min-height	Minimum height of a three-line item	88px
--paper-item-body-secondary-color	Foreground color for the secondary area	--secondary-text-color
--paper-item-body-secondary	Mixin applied to the secondary area	{}