first commit

Browser/WebViewBridge.cs

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+using Microsoft.Web.WebView2.Core;
+using Microsoft.Web.WebView2.WinForms;
+using System.Text.Json;
+
+namespace anjianjingling.Browser
+{
+    /// <summary>
+    /// 内嵌 WebView2 命令桥：把脚本命令同步封送到 UI 线程执行。
+    /// 脚本引擎在后台线程，WebView2 必须在 UI 线程访问。
+    /// </summary>
+    public sealed class WebViewBridge
+    {
+        private readonly WebView2 _web;
+        private const int DefaultTimeoutMs = 30000;
+
+        public WebViewBridge(WebView2 web) { _web = web; }
+
+        private T Invoke<T>(Func<Task<T>> func, int timeoutMs = DefaultTimeoutMs)
+        {
+            var tcs = new TaskCompletionSource<T>();
+            _web.BeginInvoke(async () =>
+            {
+                try { tcs.TrySetResult(await func()); }
+                catch (Exception ex) { tcs.TrySetException(ex); }
+            });
+            if (!tcs.Task.Wait(timeoutMs))
+                throw new TimeoutException("浏览器操作超时");
+            return tcs.Task.Result;
+        }
+
+        private void InvokeAction(Func<Task> func, int timeoutMs = DefaultTimeoutMs)
+        {
+            Invoke(async () => { await func(); return true; }, timeoutMs);
+        }
+
+        /// <summary>ExecuteScriptAsync 返回的是 JSON 字符串，解码为可读文本。</summary>
+        private static string DecodeJsResult(string json)
+        {
+            if (json == "null" || string.IsNullOrEmpty(json)) return "";
+            try
+            {
+                var el = JsonSerializer.Deserialize<JsonElement>(json);
+                return el.ValueKind == JsonValueKind.String
+                    ? el.GetString() ?? ""
+                    : el.GetRawText();
+            }
+            catch { return json; }
+        }
+
+        private static string Js(string code) => JsonSerializer.Serialize(code);
+
+        // ===================== 命令 =====================
+
+        public void Open(string url)
+        {
+            Invoke(async () =>
+            {
+                var nav = new TaskCompletionSource<bool>();
+                void Handler(object? s, CoreWebView2NavigationCompletedEventArgs e)
+                {
+                    _web.NavigationCompleted -= Handler;
+                    nav.TrySetResult(e.IsSuccess);
+                }
+                _web.NavigationCompleted += Handler;
+                _web.CoreWebView2.Navigate(url);
+                bool ok = await nav.Task;
+                return ok;
+            });
+        }
+
+        public string ExecJs(string js)
+            => DecodeJsResult(Invoke(() => _web.CoreWebView2.ExecuteScriptAsync(js)));
+
+        public bool Click(string selector)
+        {
+            string js = $$"""
+(()=>{
+  const el=document.querySelector({{Js(selector)}});
+  if(!el) return false;
+  el.scrollIntoView({block:'center'});
+  el.dispatchEvent(new MouseEvent('mousedown',{bubbles:true}));
+  el.dispatchEvent(new MouseEvent('mouseup',{bubbles:true}));
+  el.click();
+  return true;
+})()
+""";
+            return ExecJs(js) == "True";
+        }
+
+        public bool Type(string selector, string text)
+        {
+            string js = $$"""
+(()=>{
+  const el=document.querySelector({{Js(selector)}});
+  if(!el) return false;
+  const proto = el.tagName==='TEXTAREA' ? HTMLTextAreaElement.prototype : HTMLInputElement.prototype;
+  const setter = Object.getOwnPropertyDescriptor(proto,'value').set;
+  setter.call(el, {{Js(text)}});
+  el.dispatchEvent(new Event('input',{bubbles:true}));
+  el.dispatchEvent(new Event('change',{bubbles:true}));
+  return true;
+})()
+""";
+            return ExecJs(js) == "True";
+        }
+
+        private bool Exists(string selector)
+            => ExecJs($"!!document.querySelector({Js(selector)})") == "True";
+
+        public bool WaitFor(string selector, int timeoutMs)
+        {
+            var tcs = new TaskCompletionSource<bool>();
+            Task.Run(async () =>
+            {
+                var sw = System.Diagnostics.Stopwatch.StartNew();
+                while (sw.ElapsedMilliseconds < timeoutMs)
+                {
+                    try { if (Exists(selector)) { tcs.TrySetResult(true); return; } }
+                    catch { }
+                    await Task.Delay(200);
+                }
+                tcs.TrySetResult(false);
+            });
+            return tcs.Task.Wait(timeoutMs + 5000) && tcs.Task.Result;
+        }
+
+        public string GetText(string selector)
+        {
+            string js = $$"""
+(()=>{
+  const el=document.querySelector({{Js(selector)}});
+  if(!el) return null;
+  return el.value!==undefined ? el.value : (el.innerText||el.textContent);
+})()
+""";
+            return ExecJs(js);
+        }
+
+        public void Shot(string path)
+        {
+            InvokeAction(async () =>
+            {
+                Directory.CreateDirectory(Path.GetDirectoryName(Path.GetFullPath(path))!);
+                await using var fs = new FileStream(path, FileMode.Create);
+                await _web.CoreWebView2.CapturePreviewAsync(
+                    CoreWebView2CapturePreviewImageFormat.Png, fs);
+            });
+        }
+    }
+}