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	<length> \|<percentage>⁵⁺	-	No	Component width. If this attribute is not set, the default value 0 is used.
height	<length> \|<percentage>⁵⁺	-	No	Component height. If this attribute is not set, the default value 0 is used.
padding	<length>	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]	<length>	0	No	Left, top, right, and bottom padding.
margin	<length> \|<percentage>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]	<length> \|<percentage>⁵⁺	0	No	Left, top, right, and bottom margins.
border-width	<length>	0	No	Shorthand attribute to set the margin for all sides.
border-color	<color>	black	No	Shorthand attribute to set the color for all borders.
border-radius	<length>	-	No	Radius of round-corner borders.
background-color	<color>	-	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]	<length> \|<percentage>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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