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win32/dark: use existing STL classes for dwmapi
author Paper <mrpapersonic@gmail.com>
date Mon, 04 Dec 2023 11:51:30 -0500
parents c8c72278f6fd
children f0ff06a45c42
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1 #include "sys/win32/dark_theme.h"
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3 #include <QApplication>
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4 #include <QOperatingSystemVersion>
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5 #include <QSettings>
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6 #include <QWidget>
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8 #include <iostream>
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9 #include <memory>
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11 #include <dwmapi.h>
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13 struct LibraryDeconstructor {
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14 using pointer = HINSTANCE;
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15 void operator()(pointer t) const { ::FreeLibrary(t); };
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16 };
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18 using Library = std::unique_ptr<HINSTANCE, LibraryDeconstructor>;
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19
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20 class Dwmapi {
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21 public:
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22 Dwmapi() { library.reset( ::LoadLibraryW(L"dwmapi.dll")); }
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24 HRESULT SetWindowAttribute(HWND hWnd, DWORD key, LPCVOID data, DWORD sz_data) {
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25 if (!library.get())
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26 return E_POINTER;
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27
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28 /* GCC throws a fit here because C/C++ lacks a "generic" function pointer type.
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29 Ignore. */
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30 auto set_wind_attrib = reinterpret_cast<decltype(::DwmSetWindowAttribute)*>(GetProcAddress(library.get(), "DwmSetWindowAttribute"));
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31 if (!set_wind_attrib)
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32 return E_POINTER;
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33
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34 return set_wind_attrib(hWnd, key, data, sz_data);
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35 }
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37 protected:
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38 Library library = nullptr;
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39 };
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40
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41 Dwmapi dwmapi;
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43 namespace win32 {
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44
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45 /* NOTE: explicit conversion from builtin `bool` and win32 `BOOL` IS allowed. */
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46 bool SetTitleBarToBlack(QWidget* win, bool enabled) {
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47 BOOL b = enabled;
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48
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49 /* MAGIC NUMBERS: 19 and 20 are both DWMWA_USE_IMMERSIVE_DARK_MODE.
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50 For clarification: it's 20 on newer versions of windows (i.e. win11 and late win10),
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51 but it's 19 on very old versions of win10 nobody ought to be using anymore. */
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52 {
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53 HRESULT result = dwmapi.SetWindowAttribute(reinterpret_cast<HWND>(win->winId()), 20, &b, sizeof(b));
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54 if (result == S_OK)
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55 return b;
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56 }
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58 {
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59 HRESULT result = dwmapi.SetWindowAttribute(reinterpret_cast<HWND>(win->winId()), 19, &b, sizeof(b));
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60 if (result == S_OK)
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61 return b;
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62 }
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64 return b;
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65 }
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67 void SetTitleBarsToBlack(bool enabled) {
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68 for (QWidget* widget : qApp->topLevelWidgets()) {
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69 SetTitleBarToBlack(widget, enabled);
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70 }
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71 }
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72
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73 bool DarkThemeAvailable() {
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74 const auto& ver = QOperatingSystemVersion::current();
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75 return (ver.majorVersion() > 10) ? true : (ver.majorVersion() == 10 && ver.microVersion() >= 17763);
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76 }
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77
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78 bool IsInDarkTheme() {
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79 QSettings settings("HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize",
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80 QSettings::NativeFormat);
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81 return settings.value("AppsUseLightTheme", 1).toInt() == 0;
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82 }
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84 } // namespace win32