feat: 添加双屏控制功能，支持在第二块屏幕上全屏展示内容；更新相关 UI 和逻辑以适应新功能

src-tauri/capabilities/default.json

@@ -2,7 +2,7 @@
   "$schema": "../gen/schemas/desktop-schema.json",
   "identifier": "default",
   "description": "Capability for the main window",
-  "windows": ["main"],
+  "windows": ["main", "secondary"],
   "permissions": [
     "core:default",
     "core:window:default",

src-tauri/src/lib.rs

@@ -4,7 +4,49 @@
 
 use std::fs;
 use std::path::PathBuf;
-use tauri::{AppHandle, Manager};
+use tauri::{AppHandle, Manager, WebviewUrl, WebviewWindowBuilder};
+
+/// 双屏控制：on=true 在第二块屏幕上新建一个全屏窗口（加载前端首页），on=false 关闭它。
+/// 用于 admin 端「启动双屏」，让展播内容同时投到电脑的另一块显示器。
+#[tauri::command]
+fn set_dual_screen(app: AppHandle, on: bool) -> Result<String, String> {
+    if !on {
+        if let Some(w) = app.get_webview_window("secondary") {
+            let _ = w.close();
+        }
+        return Ok("off".into());
+    }
+    // 已存在则直接显示/全屏/聚焦
+    if let Some(w) = app.get_webview_window("secondary") {
+        let _ = w.show();
+        let _ = w.unminimize();
+        let _ = w.set_fullscreen(true);
+        let _ = w.set_focus();
+        return Ok("on".into());
+    }
+    let mut builder = WebviewWindowBuilder::new(&app, "secondary", WebviewUrl::App("/".into()))
+        .title("OPC 运营中心 · 双屏");
+    // 定位到第二块屏（非主屏；无第二屏则用第一块）
+    if let Ok(monitors) = app.available_monitors() {
+        let primary_pos = app
+            .primary_monitor()
+            .ok()
+            .flatten()
+            .map(|pm| { let p = pm.position(); (p.x, p.y) });
+        let target = monitors
+            .iter()
+            .find(|m| { let p = m.position(); Some((p.x, p.y)) != primary_pos })
+            .or_else(|| monitors.first());
+        if let Some(mon) = target {
+            let p = mon.position();
+            let s = mon.size();
+            builder = builder.position(p.x as f64, p.y as f64).inner_size(s.width as f64, s.height as f64);
+        }
+    }
+    let win = builder.build().map_err(|e| e.to_string())?;
+    let _ = win.set_fullscreen(true);
+    Ok("on".into())
+}
 
 /// 读取运行时配置（部署用，免重新打包）：
 ///   1) exe 同目录 config.json / dpm.config.json（最高优先）
@@ -47,11 +89,14 @@ pub fn run() {
             tauri_plugin_autostart::MacosLauncher::LaunchAgent,
             Some(vec![]),
         ))
-        .invoke_handler(tauri::generate_handler![read_runtime_config])
+        .invoke_handler(tauri::generate_handler![read_runtime_config, set_dual_screen])
         .on_window_event(|window, event| {
             if let tauri::WindowEvent::CloseRequested { api, .. } = event {
-                api.prevent_close();
-                let _ = window.minimize();
+                // 仅主窗口关闭=最小化（进程常驻）；双屏副窗口可正常关闭
+                if window.label() == "main" {
+                    api.prevent_close();
+                    let _ = window.minimize();
+                }
             }
         })
         .run(tauri::generate_context!())