change the window title to indicate the current style

include/mbgl/platform/default/glfw_view.hpp

@@ -31,6 +31,8 @@ public:
 
     void setShouldClose();
 
+    void setWindowTitle(const std::string&);
+
     void run();
     void fps();
 

linux/main.cpp

@@ -87,6 +87,7 @@ int main(int argc, char *argv[]) {
 
         const auto& newStyle = mbgl::util::defaultStyles[currentStyleIndex];
         map.setStyleURL(newStyle.first);
+        view->setWindowTitle(newStyle.second);
 
         mbgl::Log::Info(mbgl::Event::Setup, std::string("Changed style to: ") + newStyle.first);
     });
@@ -101,7 +102,9 @@ int main(int argc, char *argv[]) {
 
     // Load style
     if (style.empty()) {
-        style = mbgl::util::defaultStyles.front().first;
+        const auto& newStyle = mbgl::util::defaultStyles.front();
+        style = newStyle.first;
+        view->setWindowTitle(newStyle.second);
     }
 
     map.setStyleURL(style);

macosx/main.mm

@@ -126,7 +126,7 @@ int main() {
     map.setBearing(settings.bearing);
     map.setDebug(settings.debug);
 
-    view.setChangeStyleCallback([&map] () {
+    view.setChangeStyleCallback([&map, &view] () {
         static uint8_t currentStyleIndex;
 
         if (++currentStyleIndex == mbgl::util::defaultStyles.size()) {
@@ -135,6 +135,7 @@ int main() {
 
         const auto& newStyle = mbgl::util::defaultStyles[currentStyleIndex];
         map.setStyleURL(newStyle.first);
+        view.setWindowTitle(newStyle.second);
 
         mbgl::Log::Info(mbgl::Event::Setup, std::string("Changed style to: ") + newStyle.first);
     });
@@ -147,6 +148,7 @@ int main() {
     // Load style
     const auto& newStyle = mbgl::util::defaultStyles.front();
     map.setStyleURL(newStyle.first);
+    view.setWindowTitle(newStyle.second);
 
     view.run();
 

platform/default/glfw_view.cpp

@@ -319,6 +319,10 @@ void GLFWView::setShouldClose() {
     glfwPostEmptyEvent();
 }
 
+void GLFWView::setWindowTitle(const std::string& title) {
+    glfwSetWindowTitle(window, (std::string { "Mapbox GL: " } + title).c_str());
+}
+
 namespace mbgl {
 namespace platform {