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annotate src/sys/glib/dark_theme.cc @ 351:c844f8bb87ce

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gui/theme: add xsettings backend this also adds newly-necessary endianness methods in core/endian.h which just so happen to be constexpr as well
author Paper <paper@paper.us.eu.org>
date Sun, 14 Jul 2024 23:23:56 -0400
parents daa03aa2262d
children 99c961c91809
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1 #include "sys/glib/dark_theme.h"
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2
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3 #include <cstring>
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4 #include <gio/gio.h>
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5 #include <string_view>
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6 #include <memory>
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7 #include <array>
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8 #include <iostream>
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9
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10 namespace glib {
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11
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12 /* deleters */
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13 template<typename T>
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14 struct g_object_del {
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15 void operator()(T* p) const { ::g_object_unref(p); };
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16 };
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18 template<typename T>
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19 struct g_variant_del {
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20 void operator()(T* p) const { ::g_variant_unref(p); };
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21 };
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23 template<typename T>
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24 struct g_malloc_del {
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25 void operator()(T* p) const { ::g_free(p); };
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26 };
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28 template<typename T>
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29 using GObjectPtr = std::unique_ptr<T, g_object_del<T>>;
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31 template<typename T>
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32 using GVariantPtr = std::unique_ptr<T, g_variant_del<T>>;
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34 template<typename T>
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35 using GMallocPtr = std::unique_ptr<T, g_malloc_del<T>>;
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36
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37 /* not really "glib" but GNOME-related enough */
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38 bool IsGTKThemeDark(const std::string_view str) {
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39 /* if that doesn't exist, use the GTK theme and check for some known
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40 * suffixes. if one is found, return
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41 *
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42 * XXX probably better to use case folding here */
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43 static constexpr std::array<std::string_view, 3> suffixes = {
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44 "-dark", /* Adwaita-dark */
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45 "-Dark", /* Arc-Dark */
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46 "-Darker", /* Arc-Darker */
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47 };
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48
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49 for (const auto& suffix : suffixes) {
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50 if (str.size() < suffix.size())
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51 continue;
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52
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53 if (std::equal(str.data() + str.size() - suffix.length(), str.data() + str.size(), suffix.begin(), suffix.end()))
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54 return true;
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55 }
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56
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57 return false;
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58 }
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59
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60 bool IsInDarkTheme() {
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61 GObjectPtr<GSettings> settings(::g_settings_new("org.gnome.desktop.interface"));
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62 if (!settings)
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63 return false;
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65 {
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66 /* first attempt to get the colorscheme */
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67 GVariantPtr<GVariant> val(::g_settings_get_value(settings.get(), "color-scheme"));
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68 if (!val)
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69 return false;
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71 /* this is free'd upon deconstruction of the GVariantPtr */
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72 gsize size;
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73 const gchar* str = ::g_variant_get_string(val.get(), &size);
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74 if (!str)
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75 return false;
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76
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77 bool success = !std::strncmp(str, "prefer-dark", size);
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79 if (success)
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80 return true;
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81 }
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83 {
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84
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85 GVariantPtr<GVariant> gtk_theme(::g_settings_get_value(settings.get(), "gtk-theme"));
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86 if (!gtk_theme)
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87 return false;
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88
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89 gsize size;
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90 const gchar* str = ::g_variant_get_string(gtk_theme.get(), &size);
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91 if (!str)
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92 return false;
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93
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94 if (IsGTKThemeDark({str, size}))
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95 return true;
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96 }
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97
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98 /* welp, we tried */
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99 return false;
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100 }
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102 } // namespace glib