annotate src/sys/win32/dark_theme.cc @ 105:6d8da6e64d61

theme: add dark stylesheet, make it actually usable win32: make the titlebar black where available
author Paper <mrpapersonic@gmail.com>
date Sun, 05 Nov 2023 03:54:26 -0500
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children c8c72278f6fd
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1 #include "sys/win32/dark_theme.h"
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2 #include <QApplication>
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3 #include <QDebug>
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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 #include <iostream>
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8 #include <dwmapi.h>
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10 /* let's make a class wrapper around HINSTANCE,
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11 so we don't fuck anything up :). */
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12 class Library {
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13 public:
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14 Library() {}
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15 ~Library() {
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16 Unload();
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17 }
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18 void Unload() {
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19 if (hInstance)
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20 FreeLibrary(hInstance);
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21 loaded = false;
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22 }
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23 void Load(LPCWSTR name) {
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24 if (loaded)
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25 Unload();
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26 hInstance = LoadLibraryW(name);
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27 if (hInstance)
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28 loaded = true;
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29 }
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30 HINSTANCE GetInstance() {
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31 return hInstance;
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32 }
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33 bool IsLoaded() {
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34 return loaded;
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35 }
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36 private:
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37 HINSTANCE hInstance = nullptr;
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38 bool loaded = false;
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39 };
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40
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41 Library dwmapi;
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42
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43 namespace win32 {
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44
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45 #define GET_FUNCTION(f, i) \
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46 reinterpret_cast<decltype(::f)*>(GetProcAddress(i, #f))
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47
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48 static HRESULT SetWindowAttribute(HWND hWnd, DWORD key, LPCVOID data, DWORD sz_data) {
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49 if (!dwmapi.IsLoaded()) {
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50 dwmapi.Load(L"dwmapi.dll");
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51 if (!dwmapi.IsLoaded())
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52 return false;
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53 }
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54
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55 HINSTANCE hInstance = dwmapi.GetInstance();
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56 if (!hInstance)
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57 return false;
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58
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59 auto set_wind_attrib = GET_FUNCTION(DwmSetWindowAttribute, hInstance);
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60 if (!set_wind_attrib)
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61 return false;
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62
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63 return set_wind_attrib(hWnd, key, data, sz_data);
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64 }
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65
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66 /* Ok, so this doesn't work. Woohoo! :) */
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67 bool SetTitleBarToBlack(QWidget* win, bool enabled) {
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68 BOOL b = enabled;
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69
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70 /* MAGIC NUMBERS: 19 and 20 are both DWMWA_USE_IMMERSIVE_DARK_MODE.
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71 clarification: it's 20 on newer versions of windows (i.e. win11 and late win10),
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72 but it's 19 on very old versions of win10 nobody ought to be using. */
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73 {
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74 HRESULT result = SetWindowAttribute(reinterpret_cast<HWND>(win->winId()), 20, &b, sizeof(b));
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75 if (result == S_OK)
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76 return b;
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77 }
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78
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79 {
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80 /* It's 19 in older Windows 10 versions. Yeah, stupid. */
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81 HRESULT result = SetWindowAttribute(reinterpret_cast<HWND>(win->winId()), 19, &b, sizeof(b));
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82 if (result == S_OK)
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83 return b;
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84 }
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85
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86 return b;
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87 }
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88
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89 void SetTitleBarsToBlack(bool enabled) {
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90 for (QWidget* widget : qApp->topLevelWidgets()) {
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91 SetTitleBarToBlack(widget, enabled);
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92 }
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93 }
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94
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95 bool DarkThemeAvailable() {
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96 const auto& ver = QOperatingSystemVersion::current();
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97 return (ver.majorVersion() > 10) ? true : (ver.majorVersion() == 10 && ver.microVersion() >= 17763);
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98 }
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99
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100 bool IsInDarkTheme() {
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101 QSettings settings("HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize",
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102 QSettings::NativeFormat);
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103 return settings.value("AppsUseLightTheme", 1).toInt() == 0;
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104 }
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106 } // namespace win32