|
| 1 | +from webview.webview import Webview, Size, SizeHint |
| 2 | +from urllib.parse import quote |
| 3 | +import json |
| 4 | + |
| 5 | +# 创建Webview实例 |
| 6 | +webview = Webview(debug=True) |
| 7 | +webview.title = "Preact与Python交互示例" |
| 8 | +webview.size = Size(800, 600, SizeHint.NONE) |
| 9 | + |
| 10 | +# 初始计数器值 |
| 11 | +count = 0 |
| 12 | + |
| 13 | +# Python函数: 获取当前计数 |
| 14 | +def get_count(): |
| 15 | + return count |
| 16 | + |
| 17 | +# Python函数: 增加计数 |
| 18 | +def increment(): |
| 19 | + global count |
| 20 | + count += 1 |
| 21 | + return count |
| 22 | + |
| 23 | +# Python函数: 减少计数 |
| 24 | +def decrement(): |
| 25 | + global count |
| 26 | + count -= 1 |
| 27 | + return count |
| 28 | + |
| 29 | +# 绑定Python函数 |
| 30 | +webview.bind("getCount", get_count) |
| 31 | +webview.bind("increment", increment) |
| 32 | +webview.bind("decrement", decrement) |
| 33 | + |
| 34 | +# HTML内容 |
| 35 | +html = """ |
| 36 | +<!DOCTYPE html> |
| 37 | +<html lang="en"> |
| 38 | +<head> |
| 39 | + <meta charset="UTF-8"> |
| 40 | + <meta name="viewport" content="width=device-width, initial-scale=1.0"> |
| 41 | + <title>Preact与Python交互示例</title> |
| 42 | + <style> |
| 43 | + body { |
| 44 | + font-family: system-ui, sans-serif; |
| 45 | + max-width: 500px; |
| 46 | + margin: 0 auto; |
| 47 | + padding: 2rem; |
| 48 | + text-align: center; |
| 49 | + } |
| 50 | + button { |
| 51 | + margin: 0 0.5rem; |
| 52 | + padding: 0.5rem 1rem; |
| 53 | + font-size: 1rem; |
| 54 | + cursor: pointer; |
| 55 | + } |
| 56 | + .counter { |
| 57 | + font-size: 2rem; |
| 58 | + margin: 2rem 0; |
| 59 | + } |
| 60 | + .loading { |
| 61 | + opacity: 0.5; |
| 62 | + } |
| 63 | + .error { |
| 64 | + color: red; |
| 65 | + margin: 1rem 0; |
| 66 | + } |
| 67 | + </style> |
| 68 | +</head> |
| 69 | +<body> |
| 70 | + <div id="app"></div> |
| 71 | +
|
| 72 | + <script type="module"> |
| 73 | + import { h, render } from 'https://esm.sh/preact'; |
| 74 | + import { useState, useEffect } from 'https://esm.sh/preact/hooks'; |
| 75 | + import htm from 'https://esm.sh/htm'; |
| 76 | +
|
| 77 | + // 初始化htm与Preact |
| 78 | + const html = htm.bind(h); |
| 79 | +
|
| 80 | + function Counter() { |
| 81 | + const [count, setCount] = useState(null); |
| 82 | + const [loading, setLoading] = useState(true); |
| 83 | + const [updating, setUpdating] = useState(false); |
| 84 | + const [error, setError] = useState(null); |
| 85 | + |
| 86 | + // 从Python获取计数 |
| 87 | + const fetchCount = async () => { |
| 88 | + try { |
| 89 | + setLoading(true); |
| 90 | + setError(null); |
| 91 | + const result = await getCount(); |
| 92 | + setCount(result); |
| 93 | + } catch (err) { |
| 94 | + setError('获取计数失败: ' + err.message); |
| 95 | + console.error('获取计数错误:', err); |
| 96 | + } finally { |
| 97 | + setLoading(false); |
| 98 | + } |
| 99 | + }; |
| 100 | + |
| 101 | + // 初始加载 |
| 102 | + useEffect(() => { |
| 103 | + fetchCount(); |
| 104 | + }, []); |
| 105 | + |
| 106 | + // 增加计数 - 处理异步 |
| 107 | + const handleIncrement = async () => { |
| 108 | + try { |
| 109 | + setUpdating(true); |
| 110 | + setError(null); |
| 111 | + const newCount = await increment(); |
| 112 | + setCount(newCount); |
| 113 | + } catch (err) { |
| 114 | + setError('增加计数失败: ' + err.message); |
| 115 | + console.error('增加计数错误:', err); |
| 116 | + } finally { |
| 117 | + setUpdating(false); |
| 118 | + } |
| 119 | + }; |
| 120 | + |
| 121 | + // 减少计数 - 处理异步 |
| 122 | + const handleDecrement = async () => { |
| 123 | + try { |
| 124 | + setUpdating(true); |
| 125 | + setError(null); |
| 126 | + const newCount = await decrement(); |
| 127 | + setCount(newCount); |
| 128 | + } catch (err) { |
| 129 | + setError('减少计数失败: ' + err.message); |
| 130 | + console.error('减少计数错误:', err); |
| 131 | + } finally { |
| 132 | + setUpdating(false); |
| 133 | + } |
| 134 | + }; |
| 135 | + |
| 136 | + // 显示加载状态 |
| 137 | + if (loading) { |
| 138 | + return html`<div>加载中...</div>`; |
| 139 | + } |
| 140 | + |
| 141 | + return html` |
| 142 | + <div class=${updating ? 'loading' : ''}> |
| 143 | + <h1>Preact计数器示例</h1> |
| 144 | + <p>通过Python后端管理状态（异步通信）</p> |
| 145 | + |
| 146 | + <div class="counter">${count !== null ? count : '...'}</div> |
| 147 | + |
| 148 | + ${error && html`<div class="error">${error}</div>`} |
| 149 | + |
| 150 | + <div> |
| 151 | + <button |
| 152 | + onClick=${handleDecrement} |
| 153 | + disabled=${updating} |
| 154 | + > |
| 155 | + 减少 |
| 156 | + </button> |
| 157 | + <button |
| 158 | + onClick=${handleIncrement} |
| 159 | + disabled=${updating} |
| 160 | + > |
| 161 | + 增加 |
| 162 | + </button> |
| 163 | + </div> |
| 164 | + </div> |
| 165 | + `; |
| 166 | + } |
| 167 | + |
| 168 | + // 渲染应用 |
| 169 | + render(html`<${Counter} />`, document.getElementById('app')); |
| 170 | + </script> |
| 171 | +</body> |
| 172 | +</html> |
| 173 | +""" |
| 174 | + |
| 175 | +webview.navigate(f"data:text/html,{quote(html)}") |
| 176 | +webview.run() |
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