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Embed the blue SyncWarden shield icon in the panel binary and set it as the window icon via Win32 SendMessage/WM_SETICON on startup. Uses the syncing (blue) variant as the status-independent panel icon. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
86 lines
1.9 KiB
Go
86 lines
1.9 KiB
Go
//go:build windows
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package main
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import (
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"bytes"
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_ "embed"
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"encoding/binary"
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"os"
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"path/filepath"
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"syscall"
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"unsafe"
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)
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//go:embed panel_icon.png
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var panelIconPNG []byte
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func setWindowIcon(windowPtr unsafe.Pointer) {
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hwnd := uintptr(windowPtr)
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if hwnd == 0 {
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return
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}
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// Write a temp ICO file (Windows LoadImage needs a file path)
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icoData := wrapPNG(panelIconPNG, 64, 64)
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icoPath := filepath.Join(os.TempDir(), "syncwarden-panel.ico")
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if err := os.WriteFile(icoPath, icoData, 0644); err != nil {
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return
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}
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user32 := syscall.NewLazyDLL("user32.dll")
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loadImage := user32.NewProc("LoadImageW")
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sendMessage := user32.NewProc("SendMessageW")
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pathW, _ := syscall.UTF16PtrFromString(icoPath)
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const (
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imageIcon = 1
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lrLoadFromFile = 0x0010
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wmSetIcon = 0x0080
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iconBig = 1
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iconSmall = 0
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)
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hBig, _, _ := loadImage.Call(0, uintptr(unsafe.Pointer(pathW)), imageIcon, 32, 32, lrLoadFromFile)
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if hBig != 0 {
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sendMessage.Call(hwnd, wmSetIcon, iconBig, hBig)
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}
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hSmall, _, _ := loadImage.Call(0, uintptr(unsafe.Pointer(pathW)), imageIcon, 16, 16, lrLoadFromFile)
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if hSmall != 0 {
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sendMessage.Call(hwnd, wmSetIcon, iconSmall, hSmall)
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}
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}
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func wrapPNG(pngData []byte, width, height int) []byte {
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const headerSize = 6
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const entrySize = 16
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imageOffset := headerSize + entrySize
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buf := new(bytes.Buffer)
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binary.Write(buf, binary.LittleEndian, uint16(0))
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binary.Write(buf, binary.LittleEndian, uint16(1))
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binary.Write(buf, binary.LittleEndian, uint16(1))
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w := byte(width)
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if width >= 256 {
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w = 0
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}
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h := byte(height)
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if height >= 256 {
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h = 0
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}
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buf.WriteByte(w)
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buf.WriteByte(h)
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buf.WriteByte(0)
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buf.WriteByte(0)
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binary.Write(buf, binary.LittleEndian, uint16(1))
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binary.Write(buf, binary.LittleEndian, uint16(32))
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binary.Write(buf, binary.LittleEndian, uint32(len(pngData)))
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binary.Write(buf, binary.LittleEndian, uint32(imageOffset))
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buf.Write(pngData)
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return buf.Bytes()
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}
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