Show · Image

Image

Used to display and preview images.

Demos

How to import

import { Image, ImagePreview } from '@fibrous/semi-ui-solid';

Basic usage

You can get an image with preview function by specifying the image path through src, and specify the width and height of the image through width, height

Abstract colorful artwork
Code
import { Image } from '@fibrous/semi-ui-solid';

export default function ImageDemo() {
    return <Image width={360} height={200} alt="Abstract colorful artwork" src="/assets/root-web-sites/abstract.jpg" />;
}

Loading failed placeholder

fallback takes a string or a JSX element: a string is the URL of the image shown when loading fails, and a JSX element is shown as it is; without it, the default failure icon is shown

加载失败默认样式
加载失败的图片

自定义加载失败占位图
加载失败的图片
Code
import { IconUploadError } from '@fibrous/semi-icons-solid';
import { Image } from '@fibrous/semi-ui-solid';

export default function ImageDemo() {
    return (
        <div style={{ display: 'flex', 'align-items': 'center', 'flex-direction': 'column' }}>
            <span>加载失败默认样式</span>
            <Image width={200} height={200} src="https://load-error.jpeg" alt="加载失败的图片" />
            <br />
            <span>自定义加载失败占位图</span>
            <Image width={200} height={200} src="https://load-error.jpeg" alt="加载失败的图片" fallback={<IconUploadError style={{ 'font-size': '50px' }} />} />
        </div>
    );
}

Progressive loading

Large images can be progressively loaded through placeholder: the JSX element passed in is shown until the image has loaded

Abstract colorful artwork

Code
import { createSignal } from 'solid-js';
import { Button, Image } from '@fibrous/semi-ui-solid';

export default function ImageDemo() {
    const [timestamp, setTimestamp] = createSignal('');
    return (
        <>
            <Image width={300} height={200} alt="Abstract colorful artwork" src={`/assets/root-web-sites/abstract-big.png?${timestamp()}`} placeholder={<Image src="/assets/root-web-sites/abstract-small.jpeg" width={300} height={200} alt="" preview={false} />} />
            <br />
            <Button
                theme="solid"
                onClick={() => {
                    setTimestamp(String(Date.now()));
                }}
                style={{ 'margin-top': '10px' }}
            >
                Reload
            </Button>
        </>
    );
}

Customize the preview image

You can customize the preview image by setting the src of the Image component to be different from the src in the preview parameter

Abstract colorful artwork
Code
import { Image } from '@fibrous/semi-ui-solid';

export default function ImageDemo() {
    return (
        <Image
            width={300}
            height={200}
            alt="Abstract colorful artwork"
            src="/assets/root-web-sites/abstract-small.jpeg"
            preview={{
                src: '/assets/root-web-sites/abstract-big.png',
            }}
        />
    );
}

Multi-image preview

Use ImagePreview to wrap Image to achieve multi-image preview

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Code
import { Index } from 'solid-js';
import { Image, ImagePreview } from '@fibrous/semi-ui-solid';

const srcList = ['/assets/root-web-sites/abstract.jpg', '/assets/root-web-sites/sky.jpg', '/assets/root-web-sites/greenleaf.jpg', '/assets/root-web-sites/colorful.jpg'];

export default function ImageDemo() {
    return (
        <ImagePreview>
            <Index each={srcList}>{(src, index) => <Image src={src()} width={200} alt={`lamp${index + 1}`} style={{ 'margin-right': '5px' }} />}</Index>
        </ImagePreview>
    );
}

Use the preview component alone

The preview component ImagePreview can be used alone, through visible and onVisibleChange to control whether to preview, src to pass in the image that can be previewed, and previewTitle (a JSX element) to set the title at the top of the preview


Code
import { createSignal } from 'solid-js';
import { Button, ImagePreview } from '@fibrous/semi-ui-solid';

const srcList = ['/assets/root-web-sites/abstract.jpg', '/assets/root-web-sites/sky.jpg', '/assets/root-web-sites/greenleaf.jpg', '/assets/root-web-sites/colorful.jpg'];

export default function ImageDemo() {
    const [visible1, setVisible1] = createSignal(false);
    const [visible2, setVisible2] = createSignal(false);

    return (
        <>
            <Button onClick={() => setVisible1(true)}>Preview single Image</Button>
            <ImagePreview src="/assets/root-web-sites/sky.jpg" visible={visible1()} onVisibleChange={(visible) => setVisible1(visible)} />
            <br />
            <Button onClick={() => setVisible2(true)} style={{ 'margin-top': '20px' }}>
                Preview multiple Images
            </Button>
            <ImagePreview src={srcList} previewTitle="Scenery" visible={visible2()} onVisibleChange={(visible) => setVisible2(visible)} />
        </>
    );
}

Render in the specified container

You can specify the parent DOM of the preview component through getPopupContainer (you need to specify position: relative), and the image preview will be rendered into this DOM. This will change the DOM tree position, but not the view's rendering position.

When the container is not document.body (including a getPopupContainer set only on ConfigProvider), the preview is non-modal: it does not output aria-modal, does not trap Tab and does not lock page scrolling. Returning document.body from getPopupContainer is the same as not passing it.

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Code
import { Index } from 'solid-js';
import { Image, ImagePreview } from '@fibrous/semi-ui-solid';

const srcList = ['/assets/root-web-sites/abstract.jpg', '/assets/root-web-sites/sky.jpg', '/assets/root-web-sites/greenleaf.jpg'];

export default function ImageDemo() {
    return (
        <div id="container" style={{ height: '400px', position: 'relative' }}>
            <ImagePreview
                getPopupContainer={() => {
                    const node = document.getElementById('container') as HTMLElement;
                    return node;
                }}
                style={{ height: '100%', display: 'flex', 'align-items': 'center', 'justify-content': 'center' }}
            >
                <Index each={srcList}>{(src, index) => <Image src={src()} width={200} alt={`lamp${index + 1}`} style={{ 'margin-right': '5px' }} />}</Index>
            </ImagePreview>
        </div>
    );
}

Customize the bottom operation area of the preview

renderPreviewMenu customizes the bottom action area of the preview; it receives the MenuProps values listed below and returns a JSX element. An Image wrapped by ImagePreview uses the renderPreviewMenu of ImagePreview; a standalone Image passes the same-named property through its preview object

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Code
import { Index } from 'solid-js';
import { IconChevronLeft, IconChevronRight, IconDownload, IconMinus, IconPlus, IconRealSizeStroked, IconRotate, IconWindowAdaptionStroked } from '@fibrous/semi-icons-solid';
import { Button, Image, ImagePreview, type ImagePreviewMenuProps } from '@fibrous/semi-ui-solid';

const srcList = ['/assets/root-web-sites/abstract.jpg', '/assets/root-web-sites/sky.jpg', '/assets/root-web-sites/greenleaf.jpg'];

// the preview calls the renderer once and the menu's fields are getters, so each JSX expression reads them live
function renderPreviewMenu(menu: ImagePreviewMenuProps) {
    return (
        <div style={{ background: 'grey', height: '40px', width: '280px', display: 'flex', 'align-items': 'center', 'justify-content': 'space-around', 'border-radius': '3px' }}>
            <Button aria-label="上一张" icon={<IconChevronLeft size="large" />} type="tertiary" onClick={menu.onPrev} disabled={menu.disabledPrev} />
            <Button aria-label="下一张" icon={<IconChevronRight size="large" />} type="tertiary" onClick={menu.onNext} disabled={menu.disabledNext} />
            <Button aria-label="缩小" icon={<IconMinus size="large" />} type="tertiary" onClick={menu.onZoomOut} disabled={menu.disabledZoomOut} />
            <Button aria-label="放大" icon={<IconPlus size="large" />} type="tertiary" onClick={menu.onZoomIn} disabled={menu.disabledZoomIn} />
            <Button aria-label={menu.ratio === 'adaptation' ? '原始尺寸' : '适应页面'} icon={menu.ratio === 'adaptation' ? <IconRealSizeStroked size="large" /> : <IconWindowAdaptionStroked size="large" />} type="tertiary" onClick={menu.onRatioClick} />
            <Button aria-label="旋转" icon={<IconRotate size="large" />} type="tertiary" onClick={menu.onRotateLeft} />
            <Button aria-label="下载" icon={<IconDownload size="large" />} type="tertiary" onClick={menu.onDownload} disabled={menu.disableDownload} />
        </div>
    );
}

export default function ImageDemo() {
    return (
        <ImagePreview renderPreviewMenu={renderPreviewMenu}>
            <Index each={srcList}>{(src, index) => <Image src={src()} width={200} alt={`lamp${index + 1}`} style={{ 'margin-right': '5px' }} />}</Index>
        </ImagePreview>
    );
}

To customize the bottom action area based on the default one, get the default JSX elements through the menuItems argument of renderPreviewMenu: an array in the order previous, page counter, next, zoom out, zoom slider, zoom in, original size / fit to page, rotate and download, which can be rendered in any position.

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Code
import { Index } from 'solid-js';
import { IconInfoCircle } from '@fibrous/semi-icons-solid';
import { Divider, Image, ImagePreview, Tooltip, type ImagePreviewMenuProps } from '@fibrous/semi-ui-solid';

const srcList = ['/assets/root-web-sites/abstract.jpg', '/assets/root-web-sites/sky.jpg', '/assets/root-web-sites/greenleaf.jpg'];

// the preview calls the renderer once and the menu items stay live, so the JSX reads them directly
function renderPreviewMenu(menu: ImagePreviewMenuProps) {
    return (
        <div style={{ display: 'flex', 'background-color': 'rgba(0, 0, 0, 0.75)', 'align-items': 'center', padding: '5px 16px', 'border-radius': '4px' }}>
            {menu.menuItems?.slice(0, 3)}
            <Divider layout="vertical" />
            {menu.menuItems?.slice(3, 7)}
            <Divider layout="vertical" />
            {menu.menuItems?.slice(7)}
            <Divider layout="vertical" />
            <Tooltip content="我是一个自定义操作">
                <IconInfoCircle size="large" />
            </Tooltip>
        </div>
    );
}

export default function ImageDemo() {
    return (
        <ImagePreview renderPreviewMenu={renderPreviewMenu}>
            <Index each={srcList}>{(src, index) => <Image src={src()} width={200} alt={`lamp${index + 1}`} />}</Index>
        </ImagePreview>
    );
}

Customize the preview top display area

renderHeader customizes the top area of the preview; it receives the current title (a JSX element) and returns a new JSX element

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Code
import { Index } from 'solid-js';
import { Image, ImagePreview } from '@fibrous/semi-ui-solid';

const srcList = ['/assets/root-web-sites/abstract.jpg', '/assets/root-web-sites/sky.jpg'];

export default function ImageDemo() {
    return (
        <ImagePreview
            renderHeader={(title) => (
                <div style={{ width: '100%', height: '100%', display: 'flex', 'align-items': 'center', 'justify-content': 'center' }}>
                    <span style={{ background: 'black', padding: '0 10px' }}>自定义标题:{title}</span>
                </div>
            )}
        >
            <div>
                <Index each={srcList}>{(src, index) => <Image src={src()} width={200} alt={`lamp${index + 1}`} preview={{ previewTitle: `lamp${index + 1}` }} style={{ 'margin-right': '5px' }} />}</Index>
            </div>
        </ImagePreview>
    );
}

API reference

Image

Props

PropertyDescriptionTypeDefault
altImage description, also the accessible name of a previewable thumbnail.string-
crossOriginThe crossorigin attribute passed to the native img element.'anonymous' | 'use-credentials'-
fallbackContent shown when loading fails: a string is the fallback image URL, and a JSX element is shown as it is. Without it, the default failure icon is shown.JSX.Element-
heightDisplay height of the image; a number is in px.string | number-
imgClsCustom class name passed to the img element.string-
imgStyleCustom style passed to the img element, as a style object or a string.JSX.CSSProperties | string-
onErrorCalled when the image fails to load.TypeJSX.EventHandlerUnion<HTMLImageElement, Event>-
onLoadCalled when the image has loaded.TypeJSX.EventHandlerUnion<HTMLImageElement, Event>-
placeholderPlaceholder content shown until the image has loaded.JSX.Element-
previewPreview options; false disables preview. The object accepts the ImagePreview props except lazyLoad, lazyLoadMargin, children, class and style (use previewCls and previewStyle to style the preview).boolean | ImagePreviewPropstrue
setDownloadNameSets the download file name of the image.Type(src: string) => string-
srcImage source URL.string-
styleCustom style of the thumbnail root element, as a style object (kebab-case keys) or a string.JSX.CSSProperties | string-
widthDisplay width of the image; a number is in px.string | number-

class and style land on the thumbnail root element; ref, id, aria-* and native events (such as onClick) land on the inner img.

ImagePreview

Props

PropertyDescriptionTypeDefault
adaptiveTipTip of the fit-to-page button.string-
childrenThe Image components to preview.JSX.Element-
closableWhether to show the close button.booleantrue
closeOnEscWhether pressing Esc closes the preview.boolean-
crossOriginThe crossorigin attribute passed to the preview img element.'anonymous' | 'use-credentials'-
currentIndexControlled index of the current image.number-
defaultCurrentIndexIndex of the image shown initially.number-
defaultVisibleWhether the preview is open initially.boolean-
disableDownloadDisables downloads; the download button is also disabled when there is no current image (an empty src list).boolean-
downloadTipTip of the download button.string-
getPopupContainerParent DOM the preview renders into; returning document.body is the same as not passing it. A container other than document.body makes the preview non-modal, and a custom container needs position: relative.Type() => HTMLElement-
infiniteWhether switching wraps around infinitely.boolean-
initialZoomInitial zoom factor of an image, applied once when it first opens or is switched to, clamped by minZoom and maxZoom.number-
lazyLoadWhether to enable lazy loading, judged against the viewport; a scrolling ancestor with overflow still clips.booleantrue
lazyLoadMarginThe rootMargin passed to IntersectionObserver, computed against the viewport.string"0px 100px 100px 0px"
maskClosableWhether clicking the mask closes the preview.boolean-
maxZoomMaximum zoom factor of the preview image, such as 5 for 500%.number-
minZoomMinimum zoom factor of the preview image, such as 0.1 for 10%.number-
nextTipTip of the next-image button, also its accessible name; without it the locale text is used.string-
onChangeCalled when the image switches, with the new index.Type(index: number) => void-
onCloseCalled when the preview is closed with the close button or Esc; closing by the mask only calls onVisibleChange.Type() => void-
onDownloadCalled when an image is downloaded, with its URL and index.Type(src: string, index: number) => void-
onDownloadErrorCalled when a download fails, with the image URL.Type(src: string) => void-
onNextCalled when switching to the next image, with the new index.Type(index: number) => void-
onPrevCalled when switching to the previous image, with the new index.Type(index: number) => void-
onRatioChangeCalled when switching between original size and fit-to-page, with 'adaptation' or 'realSize'.Type(type: RatioType) => void-
onRotateLeftCalled when the image rotates counterclockwise, with the current rotation angle.Type(angle: number) => void-
onVisibleChangeCalled when the visibility changes, with whether the preview is visible.Type(visible: boolean) => void-
onZoomInCalled when the image zooms in, with the new zoom factor.Type(zoom: number) => void-
onZoomOutCalled when the image zooms out, with the new zoom factor.Type(zoom: number) => void-
originTipTip of the original-size button.string-
preLoadWhether to enable preloading.boolean-
preLoadGapStep size of preloading.number-
previewClsCustom class name of the preview layer.string-
previewStyleCustom style of the preview layer, as a style object (kebab-case keys) or a string.JSX.CSSProperties | string-
previewTitleTitle at the top of the preview, also the accessible name of the preview dialog; the preview.previewTitle of an image in a group takes precedence.JSX.Element-
prevTipTip of the previous-image button, also its accessible name; without it the locale text is used.string-
renderCloseIconCustom close icon: a JSX element, or a function that returns one.TypeJSX.Element | (() => JSX.Element)-
renderHeaderRenders the top area of the preview; it receives the current title and returns a JSX element.Type(title: JSX.Element) => JSX.Element-
renderLeftIconCustom previous-image icon: a JSX element, or a function that receives the current index and returns one.TypeJSX.Element | ((index: number) => JSX.Element)-
renderPreviewMenuRenders the bottom action area of the preview; it receives MenuProps and returns a JSX element.Type(props: MenuProps) => JSX.Element-
renderRightIconCustom next-image icon: a JSX element, or a function that receives the current index and returns one.TypeJSX.Element | ((index: number) => JSX.Element)-
rotateTipTip of the rotate button.string-
setDownloadNameSets the download file name: receives the image URL and returns the file name.Type(src: string) => string-
showTooltipWhether to show tooltips on the bottom action area.boolean-
srcImage URLs to preview. When wrapping Image components, it is merged with the preview images they register, with the src entries first.string | string[][]
viewerVisibleDelayIdle time in milliseconds before the preview action buttons hide.number-
visibleControlled visibility of the preview.boolean-
zIndexz-index of the preview layer.number-
zoomInTipTip of the zoom-in button.string-
zoomOutTipTip of the zoom-out button.string-
zoomStepZoom factor changed per zoom step, such as 0.1 for 10% per step.number-

class, style, ref and native attributes (such as aria-label and aria-labelledby) land on the group root div; with aria-label or aria-labelledby and no role, the root gets role="group". The preview dialog is rendered into getPopupContainer (document.body by default) and is named by previewTitle, or by the locale when there is no title.

min, max, step and zoom are percentages (a min of 10 means 10%, a step of 10 means 10% per step), unlike minZoom, maxZoom, zoomStep and initialZoom of ImagePreview, which are factors (such as 0.1 and 5).

PropertiesInstructionsType
curPageCurrent image page subscriptnumber
disabledPrevWhether to disable the left toggle buttonboolean
disabledNextWhether to disable the right toggle buttonboolean
disabledZoomInWhether the zoom is at its maximum (the zoom-in button is disabled)boolean
disabledZoomOutWhether the zoom is at its minimum (the zoom-out button is disabled)boolean
disableDownloadWhether to disable the download buttonboolean
maxThe maximum zoom of the image (percentage)number
minThe minimum zoom of the image (percentage)number
onDownloadCall function when the image is downloaded() => void
onZoomInCall function when the image is zoomed in() => void
onZoomOutCall function when the image is zoomed out() => void
onRatioClickCall function to switch between the original size and fit to page() => void
onPrevCall function to switch the picture forward() => void
onNextCall function to switch the picture backward() => void
onRotateLeftCall function to rotate the image counterclockwise() => void
onRotateRightCall function to rotate the image clockwise() => void
ratioOriginal size or Fit to page button state"adaptation" | "realSize"
stepStep size of zooming (percentage)number
totalNumThe total number of images that can be previewednumber
zoomCurrent zoom of the image (percentage)number
menuItemsThe default bottom operation area items as a JSX element array, which can be rendered as they areJSX.Element[]

The fields are read live: read menu.disabledPrev and the other fields directly in JSX expressions instead of destructuring the menu argument.

Accessibility

ARIA

  • When rendered into document.body (the default), the preview is a modal dialog with role="dialog" and aria-modal="true"; rendered into a custom container (getPopupContainer returns another element, including a container set on ConfigProvider) it is a non-modal dialog and does not output aria-modal. It is named by its title (previewTitle, or preview.previewTitle of an image in a group) when there is one, otherwise by "Preview" from the locale
  • Close, the left and right arrows, and the footer's previous, next, zoom out, zoom in, original size / adapt to the page, rotate and download controls are native button elements. Their accessible names come from the matching prevTip, nextTip and other tip props, or from the locale when those are not set. The zoom slider is named "Zoom" from the locale, with the current percentage as its aria-valuetext
  • At the first or last image, or at a zoom limit, the matching footer button gets aria-disabled="true" and stays focusable, so focus is not lost. The download button is also disabled when there is no current image (an empty src list)
  • The footer page counter has aria-live="polite", so screen readers announce the new position when the image changes
  • With the preview enabled and the image loaded, the root of an Image thumbnail is a focusable button (role="button", tabindex="0", aria-haspopup="dialog") named by the alt of the image; with preview set to false, or before the image has loaded, it is not focusable. Closing the preview returns focus to the thumbnail. A thumbnail inside an ImagePreview group that opens with the mouse also opens with the keyboard: while loading or after a load error it still has the button role and is focusable, and Enter or Space opens the group preview
  • The alt of the preview image is the alt of the thumbnail it shows (an ImagePreview src array has no alt, so it is an empty string)

Keyboard interaction

  • With focus on a thumbnail, Enter or Space opens the preview
  • Opening the preview moves focus into it. In a modal preview, Tab and Shift + Tab cycle through its controls and closing it returns focus to the element focused before; a non-modal preview rendered into a custom container does not trap Tab, and on close focus returns to the element focused before only if it is still inside the preview or on body, and stays where it is when it has moved elsewhere on the page
  • Enter or Space presses the focused button
  • ← and → switch to the previous and next image, swapped in RTL (ConfigProvider direction="rtl"). At the first or last image they behave like the buttons: they wrap around when infinite is true and do nothing otherwise
  • ← and → do not switch images while focus is in an input, textarea, select or editable element (such as an input in a custom footer), or while Alt, Ctrl, Meta or Shift is held; on the focused zoom slider they change the zoom
  • Esc closes the preview (unless closeOnEsc is false)
  • After the controls hide because of viewerVisibleDelay, a key press or focus on a control shows them again; they stay shown while focus is on one of them

Design Token

These are the component's internal Sass variables and cannot be overridden. To customize styles, override the --semi-* CSS variables (see the Design Token page) or write unlayered CSS rules.
Sass variableValueUsage
$transform_rotate-image_preview_spinnervar(--semi-transform_rotate-clockwise360deg)预览图像加载spin旋转角度
$transform_scale3d-image_preview_image_img1, 1, 1预览图片放大
$transform_rotate-image_preview_image_imgvar(--semi-transform_rotate-none)预览图片旋转角度
$transition_duration-image_preview500ms预览图片透明度变化动画时间
$transform_rotate-image_preview_icon_rtlvar(--semi-transform_rotate-clockwise180deg)rtl模式下向前/向后切换图片按钮旋转角度
$spacing-image_preview_icon-x24px图像预览中部左右调节icon与页面距离
$spacing-image_preview_header-paddingY0图像预览header部分上下内边距
$spacing-image_preview_header-paddingX24px图像预览header部分左右内边距
$spacing-image_preview_footer-paddingY0图像预览footer操作区部分上下内边距
$spacing-image_preview_footer-paddingX16px图像预览footer操作区部分左右内边距
$spacing-image_preview_footer_page-marginY0图像预览footer操作区图像页数据上下内边距
$spacing-image_preview_footer_page-marginX12px图像预览footer操作区图像页数据左右内边距
$spacing-image_preview_footer_slider-paddingY0图像预览footer操作区slider上下内边距
$spacing-image_preview_footer_slider-paddingX16px图像预览footer操作区slider左右内边距
$spacing-image_preview_footer_slider_handle-marginTop8px图像预览footer操作区slider的滑块上外边距
$spacing-image_preview_footer_divider-marginY0图像预览footer操作区slider的分割线上下外边距
$spacing-image_preview_footer_divider-marginX16px图像预览footer操作区slider的分割线左右外边距
$spacing-image_preview_footer_gap-marginLeft16px图像预览footer操作区icon的左外边距
$width-image_preview_footer_slider132px图像预览footer操作区slider宽度
$width-image_preview_footer_slider_handle16px图像预览footer操作区滑块宽度
$width-image_preview_icon40px图像预览footer操作区icon宽度
$width-image_preview_header_close30px图像预览header部分的关闭热区宽度
$height-image_preview_header60px图像预览header部分高度
$height-image_preview_footer48px图像预览footer部分高度
$height-image_preview_footer_slider2px图像预览footer中slider高度
$height-image_preview_footer_slider_handle16px图像预览footer中slider的滑块高度
$height-image_preview_icon40px图像预览footer操作区icon高度
$height-image_preview_header_close30px图像预览header部分的关闭热区高度
$radius-imagevar(--semi-border-radius-small)图像圆角
$radius-image_preview_footervar(--semi-border-radius-medium)图像预览footer操作区圆角
$color-image_status-bgvar(--semi-color-fill-0)图像加载失败背景颜色
$color-image_statusvar(--semi-color-disabled-text)图像状态加载失败 icon 颜色
$color-image_preview_iconvar(--semi-color-white)图像预览中部左右icon背景色
$color-image_preview_headervar(--semi-color-white)图像预览header文字颜色
$color-image_preview_footer_iconvar(--semi-color-white)图像预览footer中icon颜色
$color-image_preview_footer_slider_railvar(--semi-color-white)图像预览footer中slider滑轨颜色
$color-image_preview_disabledrgba(249, 249, 249, 0.35)图像预览禁用颜色
$color-image_preview_icon-bgrgba(0, 0, 0, 0.75)图像预览中部icon背景色
$color-image_header_close-bgrgba(0, 0, 0, 0.75)图像预览header的关闭icon的hover背景色
$color-image_preview_footer-bgrgba(0, 0, 0, 0.75)图像预览footer部分背景色
$color-image-preview_divider-bgrgba(255, 255, 255, 0.5)图像预览footer中的分割线背景色
$color-image_preview_image_spin#ccc图像预览的加载状态颜色