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annotate src/sys/win32/dark_theme.cc @ 378:5912dafc6e28

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author Paper <paper@tflc.us>
date Wed, 05 Nov 2025 12:50:35 -0500
parents 862d0d8619f6
children 5eaafed6c10b
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1 #include "sys/win32/dark_theme.h"
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2
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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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7
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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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12
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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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17
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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() {
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23 /* load functions */
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24 library.reset(::LoadLibraryW(L"dwmapi.dll"));
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25 set_wind_attrib = reinterpret_cast<decltype(::DwmSetWindowAttribute)*>(
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26 GetProcAddress(library.get(), "DwmSetWindowAttribute"));
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27 }
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28
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29 HRESULT SetWindowAttribute(HWND hWnd, DWORD key, LPCVOID data, DWORD sz_data) {
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30 if (!library.get())
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31 return E_POINTER;
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32
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33 /* GCC throws a fit here because C++ lacks a "generic" function pointer type.
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34 * Ignore. */
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35 if (!set_wind_attrib)
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36 return E_POINTER;
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37
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38 return set_wind_attrib(hWnd, key, data, sz_data);
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39 }
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41 protected:
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42 Library library = nullptr;
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43 decltype(::DwmSetWindowAttribute)* set_wind_attrib;
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44 };
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46 Dwmapi dwmapi;
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48 namespace win32 {
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49
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50 bool SetTitleBarToBlack(QWidget* win, bool enabled) {
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51 /* 19 and 20 are *both* DWMWA_USE_IMMERSIVE_DARK_MODE.
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52 *
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53 * It's 20 on newer versions of windows (i.e. win11 and late win10),
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54 * but it's 19 on very old versions of win10 nobody ought to be using anymore.
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55 */
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56 static constexpr DWORD DWMWA_USE_IMMERSIVE_DARK_MODE_OLD = 19;
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57 static constexpr DWORD DWMWA_USE_IMMERSIVE_DARK_MODE = 20;
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58
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59 BOOL b = enabled;
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61 {
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62 HRESULT result = dwmapi.SetWindowAttribute(reinterpret_cast<HWND>(win->winId()), DWMWA_USE_IMMERSIVE_DARK_MODE,
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63 &b, sizeof(b));
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64 if (result == S_OK)
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65 return b;
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66 }
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68 {
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69 HRESULT result = dwmapi.SetWindowAttribute(reinterpret_cast<HWND>(win->winId()),
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70 DWMWA_USE_IMMERSIVE_DARK_MODE_OLD, &b, sizeof(b));
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71 if (result == S_OK)
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72 return b;
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73 }
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75 return b;
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76 }
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78 void SetTitleBarsToBlack(bool enabled) {
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79 for (QWidget* widget : qApp->topLevelWidgets()) {
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80 SetTitleBarToBlack(widget, enabled);
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81 }
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82 }
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83
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84 bool DarkThemeAvailable() {
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85 const auto& ver = QOperatingSystemVersion::current();
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86 return (ver.majorVersion() > 10) ? true : (ver.majorVersion() == 10 && ver.microVersion() >= 17763);
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87 }
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88
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89 bool IsInDarkTheme() {
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90 QSettings settings("HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize",
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91 QSettings::NativeFormat);
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92 return settings.value("AppsUseLightTheme", 1).toInt() == 0;
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93 }
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95 } // namespace win32