Add test actions for C++ theme detection.

.github/workflows/theme.yml

@@ -25,3 +25,26 @@ jobs:
     - name: Checking our Python imports.
       run: |
         scripts/theme.sh
+
+  theme-cpp:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest]  # TODO: Restore macos-latest
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v4
+    - name: Checking our Python imports.
+      shell: bash
+      run: |
+        mkdir -p dist
+        cd dist
+        if [[ "${RUNNER_OS}" == "Windows" ]]; then
+          cl ../scripts/test_theme.cpp /std:c++17 /EHsc /link Advapi32.lib OleAut32.lib
+          ./test_theme
+        elif [[ "${RUNNER_OS}" == "macOS" ]]; then
+          clang++ ../scripts/test_theme.cpp -o test_theme -std=c++17
+          ./test_theme
+        else
+          g++ ../scripts/test_theme.cpp -o test_theme -std=c++17
+          ./test_theme
+        fi

.github/workflows/ui.yml

@@ -1,6 +1,6 @@
 name: Ui
 
-on: [push]
+on: [workflow_dispatch]
 
 jobs:
   ui:

example/breeze_theme.hpp

@@ -6,7 +6,7 @@
  *
  *  This code has been minimally tested but should be useful on most platforms.
  *  This makes extensive use of C++17 features. On Windows, this requires adding
- *  `OleAut32.lib` to the linker.
+ *  `OleAut32.lib` and `Advapi32.lib` to the linker.
  *
  *  This currently supports:
  *  - Windows

scripts/headless.sh

@@ -48,6 +48,8 @@ for script in example/*.py; do
 done
 
 # now we need to run our tests
+# NOTE: We run each test separately just because it simplifies the logic.
+# Some tests don't work in headless mode so we skip them.
 widgets=$(${PYTHON} -c "import os; os.chdir('test'); import ui; print(' '.join([i[5:] for i in dir(ui) if i.startswith('test_')]))")
 for widget in ${widgets[@]}; do
     for framework in "${frameworks[@]}"; do

scripts/test_theme.cpp

@@ -0,0 +1,15 @@
+/**
+ *  Example to test our theme detection works at the C++ level.
+*/
+
+#include <iostream>
+#include "../example/breeze_theme.hpp"
+
+int main()
+{
+    std::cout << "Theme: " << static_cast<int>(breeze_stylesheets::get_theme()) << std::endl;
+    std::cout << "Is Dark: " << breeze_stylesheets::is_dark() << std::endl;
+    std::cout << "Is Light: " << breeze_stylesheets::is_light() << std::endl;
+
+    return 0;
+}