Support for Windows dark mode and force option WIP

Use the new experimental wxWidgets API for dark mode on Windows. Also
add an option to force dark mode on all platforms.

Signed-off-by: Rafael Kitover <rkitover@gmail.com>

src/wx/config/internal/option-internal.cpp

@@ -348,6 +348,7 @@ std::array<Option, kNbOptions>& Option::All() {
         Option(OptionID::kUIAllowJoystickBackgroundInput, &g_owned_opts.allow_joystick_background_input),
         Option(OptionID::kUIHideMenuBar, &gopts.hide_menu_bar),
         Option(OptionID::kUISuspendScreenSaver, &gopts.suspend_screensaver),
+        Option(OptionID::kUIForceDarkMode, &gopts.force_dark_mode),
 
         /// Sound
         Option(OptionID::kSoundAudioAPI, &gopts.audio_api),

src/wx/config/option-id.h

@@ -116,6 +116,7 @@ enum class OptionID {
     kUIAllowJoystickBackgroundInput,
     kUIHideMenuBar,
     kUISuspendScreenSaver,
+    kUIForceDarkMode,
 
     /// Sound
     kSoundAudioAPI,

src/wx/config/option-proxy.h

@@ -120,6 +120,7 @@ static constexpr std::array<Option::Type, kNbOptions> kOptionsTypes = {
     /*kUIAllowJoystickBackgroundInput*/ Option::Type::kBool,
     /*kUIHideMenuBar*/ Option::Type::kBool,
     /*kUISuspendScreenSaver*/ Option::Type::kBool,
+    /*kUIForceDarkMode*/ Option::Type::kBool,
 
     /// Sound
     /*kSoundAudioAPI*/ Option::Type::kAudioApi,

src/wx/guiinit.cpp

@@ -2622,6 +2622,7 @@ bool MainFrame::BindControls()
                     cb->Hide();
 #endif // !HAVE_XSS
         }
+        { getcbb("ForceDarkMode", gopts.force_dark_mode); }
         wxFilePickerCtrl* fp;
 #define getfp(n, o, l)                                     \
     do {                                                   \

src/wx/opts.h

@@ -72,6 +72,7 @@ extern struct opts_t {
     /// UI Config
     bool hide_menu_bar = true;
     bool suspend_screensaver = false;
+    bool force_dark_mode = false;
 
     /// wxWindows
     // wxWidgets-generated options (opaque)

src/wx/wxvbam.cpp

@@ -434,6 +434,11 @@ bool wxvbamApp::OnInit() {
     }
 #endif
 
+#if defined(__WXMSW__) && wxCHECK_VERSION(3, 2, 3)
+    if (wxSystemAppearance::IsSystemDark())
+        MSWEnableDarkMode();
+#endif
+
     // process command-line options
     for (size_t i = 0; i < pending_optset.size(); i++) {
         auto parts = strutils::split(pending_optset[i], wxT('='));

src/wx/xrc/UIConfig.xrc

@@ -18,6 +18,13 @@
         <flag>wxALL</flag>
         <border>5</border>
       </object>
+      <object class="sizeritem">
+        <object class="wxCheckBox" name="ForceDarkMode">
+          <label>Force Dark Mode (requires restart)</label>
+        </object>
+        <flag>wxALL</flag>
+        <border>5</border>
+      </object>
       <object class="sizeritem">
         <flag>wxALL|wxEXPAND</flag>
         <border>5</border>