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Revert "[Light Switch] Switch desktop wallpapers with the Light/Dark mode" (#44588)

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This uses IVirtualDesktopManagerInternal*, which is an undocumented
Windows Shell internal API.
These interfaces are not stable and can change across Windows updates,
so using them in PowerToys carries some long-term risk
This commit is contained in:
Kai Tao
2026-01-08 10:14:43 +08:00
committed by GitHub
parent 08d4689ec5
commit 9c58574484
25 changed files with 310 additions and 1118 deletions
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106
src/modules/LightSwitch/LightSwitchModuleInterface/ThemeHelper.cpp Normal file
View File

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#include "pch.h"
#include <windows.h>
#include "ThemeHelper.h"
// Controls changing the themes.
static void ResetColorPrevalence()
{
HKEY hKey;
if (RegOpenKeyEx(HKEY_CURRENT_USER,
L"Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize",
0,
KEY_SET_VALUE,
&hKey) == ERROR_SUCCESS)
{
DWORD value = 0; // back to default value
RegSetValueEx(hKey, L"ColorPrevalence", 0, REG_DWORD, reinterpret_cast<const BYTE*>(&value), sizeof(value));
RegCloseKey(hKey);
SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, 0, reinterpret_cast<LPARAM>(L"ImmersiveColorSet"), SMTO_ABORTIFHUNG, 5000, nullptr);
SendMessageTimeout(HWND_BROADCAST, WM_THEMECHANGED, 0, 0, SMTO_ABORTIFHUNG, 5000, nullptr);
SendMessageTimeout(HWND_BROADCAST, WM_DWMCOLORIZATIONCOLORCHANGED, 0, 0, SMTO_ABORTIFHUNG, 5000, nullptr);
}
}
void SetAppsTheme(bool mode)
{
HKEY hKey;
if (RegOpenKeyEx(HKEY_CURRENT_USER,
L"Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize",
0,
KEY_SET_VALUE,
&hKey) == ERROR_SUCCESS)
{
DWORD value = mode;
RegSetValueEx(hKey, L"AppsUseLightTheme", 0, REG_DWORD, reinterpret_cast<const BYTE*>(&value), sizeof(value));
RegCloseKey(hKey);
SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, 0, reinterpret_cast<LPARAM>(L"ImmersiveColorSet"), SMTO_ABORTIFHUNG, 5000, nullptr);
SendMessageTimeout(HWND_BROADCAST, WM_THEMECHANGED, 0, 0, SMTO_ABORTIFHUNG, 5000, nullptr);
}
}
void SetSystemTheme(bool mode)
{
HKEY hKey;
if (RegOpenKeyEx(HKEY_CURRENT_USER,
L"Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize",
0,
KEY_SET_VALUE,
&hKey) == ERROR_SUCCESS)
{
DWORD value = mode;
RegSetValueEx(hKey, L"SystemUsesLightTheme", 0, REG_DWORD, reinterpret_cast<const BYTE*>(&value), sizeof(value));
RegCloseKey(hKey);
if (mode) // if are changing to light mode
{
ResetColorPrevalence();
}
SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, 0, reinterpret_cast<LPARAM>(L"ImmersiveColorSet"), SMTO_ABORTIFHUNG, 5000, nullptr);
SendMessageTimeout(HWND_BROADCAST, WM_THEMECHANGED, 0, 0, SMTO_ABORTIFHUNG, 5000, nullptr);
}
}
bool GetCurrentSystemTheme()
{
HKEY hKey;
DWORD value = 1; // default = light
DWORD size = sizeof(value);
if (RegOpenKeyEx(HKEY_CURRENT_USER,
L"Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize",
0,
KEY_READ,
&hKey) == ERROR_SUCCESS)
{
RegQueryValueEx(hKey, L"SystemUsesLightTheme", nullptr, nullptr, reinterpret_cast<LPBYTE>(&value), &size);
RegCloseKey(hKey);
}
return value == 1; // true = light, false = dark
}
bool GetCurrentAppsTheme()
{
HKEY hKey;
DWORD value = 1;
DWORD size = sizeof(value);
if (RegOpenKeyEx(HKEY_CURRENT_USER,
L"Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize",
0,
KEY_READ,
&hKey) == ERROR_SUCCESS)
{
RegQueryValueEx(hKey, L"AppsUseLightTheme", nullptr, nullptr, reinterpret_cast<LPBYTE>(&value), &size);
RegCloseKey(hKey);
}
return value == 1; // true = light, false = dark
}