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Auto Width Height Rem

Auto Width Height Rem

libufan

| (0) | Free
Auto generate width/height in rem from background images
Installation
Launch VS Code Quick Open (Ctrl+P), paste the following command, and press enter.
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Auto Width Height Rem

自动从背景图片生成 width、height 和 background-size 的 VSCode 插件。


🎬 效果预览

Auto Width Height Rem Demo


✨ 功能特性

  • 🖼️ 自动检测图片尺寸 - 读取 background-image 中图片的宽度和高度
  • 📐 自动转换单位 - 将 px 转换为 rem(基于配置的 font-size)
  • 🎯 居中定位计算 - 自动生成 left/top: calc(50% - width/2)
  • 🖼️ Background-size - 支持生成 background-size 属性
  • ⚡ 高效触发 - 输入 wh 开头即触发补全
  • 🌐 多框架支持 - Vue3、React、Angular、Svelte 等

📦 安装

在 VSCode 扩展商店搜索 Auto Width Height Rem 并安装。


⚡ 快捷指令

尺寸指令(width / height)

指令 功能 单位 示例(750×300px, font-size=100)
whr width + height rem width: 7.5rem; height: 3rem;
whrw width only rem width: 7.5rem;
whrh height only rem height: 3rem;
whpx width + height px width: 750px; height: 300px;
whpxw width only px width: 750px;
whpxh height only px height: 300px;

居中定位指令

指令 功能 单位 示例
whlc left 居中 rem left: calc(50% - 3.75rem);
whtc top 居中 rem top: calc(50% - 1.5rem);
whcc 完全居中 rem left + top
whlcpx left 居中 px left: calc(50% - 375px);
whtcpx top 居中 px top: calc(50% - 150px);
whccpx 完全居中 px left + top

Background-size 指令

指令 功能 单位 示例
whbs background-size rem background-size: 7.5rem 3rem;
whbsw bg-size width rem background-size: 7.5rem auto;
whbsp background-size px background-size: 750px 300px;
whbspw bg-size width px background-size: 750px auto;
whbsc cover - background-size: cover;
whbct contain - background-size: contain;

组合指令

指令 功能 单位
whall width + height + background-size rem
whallpx width + height + background-size px

📝 使用方法

1. 添加背景图片

.banner {
  background-image: url('./images/banner.png');
}

2. 输入快捷指令

在背景图片属性下方输入快捷指令(如 whr),然后按 Tab 或 Space 触发补全。

3. 自动生成代码

.banner {
  background-image: url('./images/banner.png');
  width: 7.5rem;
  height: 3rem;
}

⚙️ 配置

设置 font-size

打开 VSCode 设置(Cmd + , 或 Ctrl + ,),搜索 autoWidthHeightRem,配置 font-size:

{
  "autoWidthHeightRem.fontSize": 100
}

font-size 说明

场景 fontSize 750px 转换结果
移动端适配(设计稿 750px) 100 7.5rem
移动端适配(设计稿 375px) 50 15rem
桌面端(浏览器默认) 16 46.875rem

计算公式: rem = px ÷ font-size


🌐 支持的语言

  • CSS
  • SCSS / Sass
  • Less
  • Vue(<style> 块)
  • React(CSS Modules)
  • Angular
  • Svelte

🖼️ 支持的图片格式

PNG, JPEG/JPG, GIF, WebP, BMP, ICO, TIFF 等


📖 示例

基础用法

.card {
  background-image: url('./images/card.png');
  /* 输入 whr 并按 Tab */
  width: 7.5rem;
  height: 3rem;
}

居中定位

.box {
  background-image: url('./images/box.png');
  /* 输入 whcc 并按 Tab */
  left: calc(50% - 3.75rem);
  top: calc(50% - 1.5rem);
}

Vue3 用法

<template>
  <div class="banner"></div>
</template>

<style lang="scss" scoped>
.banner {
  background-image: url('@/assets/banner.png');
  /* 输入 whr 并按 Tab */
  width: 7.5rem;
  height: 3rem;
}
</style>

❓ 常见问题

输入 whr 没有反应?

按 Ctrl + Space(Mac: Ctrl + Space)手动触发补全。

图片路径找不到?

确保使用相对路径(如 ./images/bg.png)或 @/ 别名(如 @/assets/bg.png)。

rem 计算不正确?

检查 autoWidthHeightRem.fontSize 设置是否正确。默认是 100,即 1rem = 100px。

被 GitHub Copilot / CodeGeex 等 AI 补全工具干扰?

AI 代码补全工具(如 GitHub Copilot、CodeGeex、Tabnine 等)会干扰本插件的提示:

  • 问题现象:输入 whr 后没有弹出补全列表,AI 直接建议补全内容
  • 原因:AI 工具优先级更高,一旦预测了代码,Ctrl + Space / Cmd + Space 手动触发也无效
  • 解决方法:编写样式时,建议暂时关掉 AI 代码补全工具

⚠️ 重要:AI 工具不知道图片的真实尺寸,生成的 width/height 值几乎都是错的。本插件会读取图片实际尺寸并精确计算,所以请务必使用本插件的补全结果。


📄 License

MIT



Auto Width Height Rem

VSCode extension that automatically generates width, height, and background-size from background images.


🎬 Demo

Auto Width Height Rem Demo


✨ Features

  • 🖼️ Auto-detect image size - Read width and height from background-image
  • 📐 Auto unit conversion - Convert px to rem (based on configured font-size)
  • 🎯 Center positioning - Auto-generate left/top: calc(50% - width/2)
  • 🖼️ Background-size - Generate background-size property
  • ⚡ Fast trigger - Start typing wh to trigger autocomplete
  • 🌐 Multi-framework support - Vue3, React, Angular, Svelte, etc.

📦 Installation

Search for Auto Width Height Rem in the VSCode extension marketplace and install.


⚡ Shortcuts

Size Commands (width / height)

Command Function Unit Example (750×300px, font-size=100)
whr width + height rem width: 7.5rem; height: 3rem;
whrw width only rem width: 7.5rem;
whrh height only rem height: 3rem;
whpx width + height px width: 750px; height: 300px;
whpxw width only px width: 750px;
whpxh height only px height: 300px;

Center Positioning Commands

Command Function Unit Example
whlc left center rem left: calc(50% - 3.75rem);
whtc top center rem top: calc(50% - 1.5rem);
whcc full center rem left + top
whlcpx left center px left: calc(50% - 375px);
whtcpx top center px top: calc(50% - 150px);
whccpx full center px left + top

Background-size Commands

Command Function Unit Example
whbs background-size rem background-size: 7.5rem 3rem;
whbsw bg-size width rem background-size: 7.5rem auto;
whbsp background-size px background-size: 750px 300px;
whbspw bg-size width px background-size: 750px auto;
whbsc cover - background-size: cover;
whbct contain - background-size: contain;

Combo Commands

Command Function Unit
whall width + height + background-size rem
whallpx width + height + background-size px

📝 Usage

1. Add a background image

.banner {
  background-image: url('./images/banner.png');
}

2. Type a shortcut

Type a shortcut (e.g., whr) below the background image property, then press Tab or Space to trigger autocomplete.

3. Code is generated

.banner {
  background-image: url('./images/banner.png');
  width: 7.5rem;
  height: 3rem;
}

⚙️ Configuration

Set font-size

Open VSCode settings (Cmd + , or Ctrl + ,), search for autoWidthHeightRem, and configure font-size:

{
  "autoWidthHeightRem.fontSize": 100
}

Font-size Guide

Scenario fontSize 750px Result
Mobile (design 750px) 100 7.5rem
Mobile (design 375px) 50 15rem
Desktop (browser default) 16 46.875rem

Formula: rem = px ÷ font-size


🌐 Supported Languages

  • CSS
  • SCSS / Sass
  • Less
  • Vue (<style> blocks)
  • React (CSS Modules)
  • Angular
  • Svelte

🖼️ Supported Image Formats

PNG, JPEG/JPG, GIF, WebP, BMP, ICO, TIFF, etc.


📖 Examples

Basic Usage

.card {
  background-image: url('./images/card.png');
  /* Type whr and press Tab */
  width: 7.5rem;
  height: 3rem;
}

Center Positioning

.box {
  background-image: url('./images/box.png');
  /* Type whcc and press Tab */
  left: calc(50% - 3.75rem);
  top: calc(50% - 1.5rem);
}

Vue3 Usage

<template>
  <div class="banner"></div>
</template>

<style lang="scss" scoped>
.banner {
  background-image: url('@/assets/banner.png');
  /* Type whr and press Tab */
  width: 7.5rem;
  height: 3rem;
}
</style>

❓ FAQ

whr doesn't trigger?

Press Ctrl + Space to manually trigger autocomplete.

Image path not found?

Make sure to use relative paths (e.g., ./images/bg.png) or @/ aliases (e.g., @/assets/bg.png).

Rem calculation incorrect?

Check if autoWidthHeightRem.fontSize is set correctly. Default is 100, meaning 1rem = 100px.

Interfered by GitHub Copilot / CodeGeex or other AI completion tools?

AI code completion tools (such as GitHub Copilot, CodeGeex, Tabnine, etc.) will interfere with this extension's suggestions:

  • Symptom: After typing whr, no completion list appears, AI directly suggests completion content
  • Cause: AI tools have higher priority. Once they predict code, Ctrl + Space / Cmd + Space manual trigger is also ineffective
  • Solution: Temporarily disable AI code completion tools when writing styles

⚠️ Important: AI tools don't know the actual image dimensions, so the generated width/height values are almost always wrong. This extension reads the actual image size and calculates precisely, so please make sure to use this extension's completion results.


📄 License

MIT

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