Drew Weymouth
67623366f5
* MacOS: match window chrome to app light/dark mode when app setting is different from OS * match window border to app theme on Windows
58 lines
1.4 KiB
Go
58 lines
1.4 KiB
Go
//go:build windows
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package controller
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import (
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"runtime"
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"syscall"
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"unsafe"
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"fyne.io/fyne/v2"
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"golang.org/x/sys/windows/registry"
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)
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var (
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dwm = syscall.NewLazyDLL("dwmapi.dll")
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setAtt = dwm.NewProc("DwmSetWindowAttribute")
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)
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func setWindowDarkTheme(hwnd uintptr, mode int) {
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if runtime.GOOS != "windows" {
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return
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}
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arg := 0
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switch mode {
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case 0: /*auto*/
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if isDark() {
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arg = 1
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}
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case 1: /*dark*/
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arg = 1
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}
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// copied from Fyne internals
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ret, _, err := setAtt.Call(uintptr(unsafe.Pointer(hwnd)), // window handle
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20, // DWMWA_USE_IMMERSIVE_DARK_MODE
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uintptr(unsafe.Pointer(&arg)), // on or off
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4) // sizeof(bool for windows))
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if ret != 0 && ret != 0x80070057 { // err is always non-nil, we check return value (except erroneous code)
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fyne.LogError("Failed to set dark mode", err)
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}
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}
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// copied from Fyne internals
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func isDark() bool {
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k, err := registry.OpenKey(registry.CURRENT_USER, `SOFTWARE\Microsoft\Windows\CurrentVersion\Themes\Personalize`, registry.QUERY_VALUE)
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if err != nil { // older version of Windows will not have this key
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return false
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}
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defer k.Close()
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useLight, _, err := k.GetIntegerValue("AppsUseLightTheme")
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if err != nil { // older version of Windows will not have this value
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return false
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}
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return useLight == 0
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}
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