harmony 鸿蒙stack

  • 2023-06-24
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stack

The <stack> component provides a stack container where child components are successively stacked and the latter one overwrites the previous one.

NOTE

This component is supported since API version 4. Updates will be marked with a superscript to indicate their earliest API version.

Child Components

Supported.

Attributes

Name Type Default Value Mandatory Description
id string - No Unique ID of the component.
style string - No Style declaration of the component.
class string - No Style class of the component, which is used to refer to a style table.
ref string - No Reference information of child elements, which is registered with the parent component on $refs.

Events

Name Parameter Description
click - Triggered when the component is clicked.
longpress - Triggered when the component is long pressed.
swipe5+ SwipeEvent Triggered when a user quickly swipes on the component.

Styles

Name Type Default Value Mandatory Description
width &lt;length&gt; |&lt;percentage&gt;5+ - No Component width.

If this attribute is not set, the default value 0 is used.
height &lt;length&gt; |&lt;percentage&gt;5+ - No Component height.

If this attribute is not set, the default value 0 is used.
padding &lt;length&gt; 0 No Shorthand attribute to set the padding for all sides.
The attribute can have one to four values:
- If you set only one value, it specifies the padding for all the four sides.
- If you set two values, the first value specifies the top and bottom padding, and the second value specifies the left and right padding.
- If you set three values, the first value specifies the top padding, the second value specifies the left and right padding, and the third value specifies the bottom padding.
- If you set four values, they respectively specify the padding for top, right, bottom, and left sides (in clockwise order).
padding-[left|top|right|bottom] &lt;length&gt; 0 No Left, top, right, and bottom padding.
margin &lt;length&gt; |&lt;percentage&gt;5+ 0 No Shorthand attribute to set the margin for all sides. The attribute can have one to four values:
- If you set only one value, it specifies the margin for all the four sides.
- If you set two values, the first value specifies the top and bottom margins, and the second value specifies the left and right margins.
- If you set three values, the first value specifies the top margin, the second value specifies the left and right margins, and the third value specifies the bottom margin.
- If you set four values, they respectively specify the margin for top, right, bottom, and left sides (in clockwise order).
margin-[left|top|right|bottom] &lt;length&gt; |&lt;percentage&gt;5+ 0 No Left, top, right, and bottom margins.
border-width &lt;length&gt; 0 No Shorthand attribute to set the margin for all sides.
border-color &lt;color&gt; black No Shorthand attribute to set the color for all borders.
border-radius &lt;length&gt; - No Radius of round-corner borders.
background-color &lt;color&gt; - No Background color.
opacity5+ number 1 No Opacity of an element. The value ranges from 0 to 1. The value 1 means opaque, and 0 means completely transparent.
display string flex No How and whether to display the box containing an element. Available values are as follows:
- flex: flexible layout
- none: not rendered
[left|top] &lt;length&gt; |&lt;percentage&gt;6+ - No Edge of the element.
- left: left edge position of the element. This attribute defines the offset between the left edge of the margin area of a positioned element and left edge of its containing block.
- top: top edge position of the element. This attribute defines the offset between the top edge of a positioned element and that of a block included in the element.

NOTE

The absolute positioning does not support a percentage. Therefore, margin cannot be set for the child components of the <stack> component.

Example

<!-- xxx.hml -->
<stack class="stack-parent">
  <div class="back-child bd-radius"></div>
  <div class="positioned-child bd-radius"></div>
  <div class="front-child bd-radius"></div>
</stack>
/* xxx.css */
.stack-parent {
  width: 400px;
  height: 400px;
  background-color: #ffffff;
  border-width: 1px;
  border-style: solid;
}
.back-child {
  width: 300px;
  height: 300px;
  background-color: #3f56ea;
}
.front-child {
  width: 100px;
  height: 100px;
  background-color: #00bfc9;
}
.positioned-child {
  width: 100px;
  height: 100px;
  left: 50px;
  top: 50px;
  background-color: #47cc47;
}
.bd-radius {
  border-radius: 16px;
}

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