重构: 拆分main.go为5个文件 + 壁纸HTML移至web目录

- main.go: 入口+单实例互斥锁
- win32.go: Win32 API/embed/evalJS/全局变量
- config.go: 配置读写+图标生成
- weather.go: 天气API/定位/天气循环
- systray.go: 托盘菜单/WebView/全屏监控
- wallpaper.html → web/wallpaper.html

win32.go

@@ -0,0 +1,84 @@
+package main
+
+import (
+	"embed"
+	"log"
+	"unsafe"
+
+	"github.com/jchv/go-webview2"
+	"golang.org/x/sys/windows"
+)
+
+//go:embed web/wallpaper.html
+var fs embed.FS
+
+var (
+	user32                  = windows.NewLazySystemDLL("user32.dll")
+	procFindWindowW         = user32.NewProc("FindWindowW")
+	procFindWindowExW       = user32.NewProc("FindWindowExW")
+	procSendMessageTimeoutW = user32.NewProc("SendMessageTimeoutW")
+	procSetParent           = user32.NewProc("SetParent")
+	procGetForegroundWindow = user32.NewProc("GetForegroundWindow")
+	procGetWindowRect       = user32.NewProc("GetWindowRect")
+	procGetSystemMetrics    = user32.NewProc("GetSystemMetrics")
+	procMoveWindow          = user32.NewProc("MoveWindow")
+	procShowWindow          = user32.NewProc("ShowWindow")
+	procSetProcessDPIAware  = user32.NewProc("SetProcessDPIAware")
+	procSetWindowLongPtrW   = user32.NewProc("SetWindowLongPtrW")
+	procGetMessageW         = user32.NewProc("GetMessageW")
+	procPostMessageW        = user32.NewProc("PostMessageW")
+	procTranslateMessage    = user32.NewProc("TranslateMessage")
+	procDispatchMessageW    = user32.NewProc("DispatchMessageW")
+)
+
+var wv webview2.WebView
+var wvHwnd uintptr
+var jsQueue = make(chan string, 64)
+var paused int32
+
+const wmEvalJS = 0x0401
+
+func evalJS(js string) {
+	select {
+	case jsQueue <- js:
+		log.Println("evalJS queued:", js[:min(len(js), 60)])
+	default:
+		log.Println("jsQueue full, dropping eval")
+	}
+	if wvHwnd != 0 {
+		procPostMessageW.Call(wvHwnd, wmEvalJS, 0, 0)
+	}
+}
+
+func min(a, b int) int {
+	if a < b {
+		return a
+	}
+	return b
+}
+
+func findWorkerW() uintptr {
+	progman, _, _ := procFindWindowW.Call(
+		uintptr(unsafe.Pointer(windows.StringToUTF16Ptr("Progman"))), 0)
+	if progman == 0 {
+		return 0
+	}
+	var result uintptr
+	procSendMessageTimeoutW.Call(progman, 0x052C, 0, 0, 0x0000, 1000, uintptr(unsafe.Pointer(&result)))
+	shellDefView, _, _ := procFindWindowExW.Call(progman, 0,
+		uintptr(unsafe.Pointer(windows.StringToUTF16Ptr("SHELLDLL_DefView"))), 0)
+	workerwAfterShell, _, _ := procFindWindowExW.Call(progman, shellDefView,
+		uintptr(unsafe.Pointer(windows.StringToUTF16Ptr("WorkerW"))), 0)
+	if workerwAfterShell != 0 {
+		return workerwAfterShell
+	}
+	ww, _, _ := procFindWindowExW.Call(progman, 0,
+		uintptr(unsafe.Pointer(windows.StringToUTF16Ptr("WorkerW"))), 0)
+	return ww
+}
+
+func getScreenSize() (int32, int32) {
+	w, _, _ := procGetSystemMetrics.Call(0)
+	h, _, _ := procGetSystemMetrics.Call(1)
+	return int32(w), int32(h)
+}