Add style change functionality to the Linux test app

Makes the life of people using Linux as development environment way
easier.

Just press 's' to cycle through 3 different styles.

3 files changed, 43 insertions, 0 deletions

diff --git a/platform/default/default_styles.cpp b/platform/default/default_styles.cpp
new file mode 100644
index 0000000000..727636b3c4
--- /dev/null
+++ b/platform/default/default_styles.cpp
@@ -0,0 +1,18 @@
+#include "default_styles.hpp"
+
+namespace mbgl {
+namespace util {
+
+const std::vector<std::pair<std::string, std::string>> defaultStyles = {
+    { "asset://styles/mapbox-streets-v7.json", "Mapbox Streets" },
+    { "asset://styles/emerald-v7.json", "Emerald" },
+    { "asset://styles/light-v7.json", "Light" },
+    { "asset://styles/dark-v7.json", "Dark" },
+    { "asset://styles/bright-v7.json", "Bright" },
+    { "asset://styles/basic-v7.json", "Basic" },
+    { "asset://styles/outdoors-v7.json", "Outdoors" },
+    { "asset://styles/satellite-v7.json", "Satellite" },
+};
+
+} // end namespace util
+} // end namespace mbgl
diff --git a/platform/default/default_styles.hpp b/platform/default/default_styles.hpp
new file mode 100644
index 0000000000..dc10009305
--- /dev/null
+++ b/platform/default/default_styles.hpp
@@ -0,0 +1,17 @@
+#ifndef MBGL_PLATFORM_DEFAULT_STYLES
+#define MBGL_PLATFORM_DEFAULT_STYLES
+
+#include <vector>
+#include <string>
+
+namespace mbgl {
+namespace util {
+
+// A list of default styles, with the first string being the URL
+// and the second being the user-visible name.
+extern const std::vector<std::pair<std::string, std::string>> defaultStyles;
+
+} // end namespace util
+} // end namespace mbgl
+
+#endif
diff --git a/platform/default/glfw_view.cpp b/platform/default/glfw_view.cpp
index 56aeaf30a3..bfe1882608 100644
--- a/platform/default/glfw_view.cpp
+++ b/platform/default/glfw_view.cpp
@@ -179,6 +179,10 @@ void GLFWView::onKey(GLFWwindow *window, int key, int /*scancode*/, int action,
             if (!mods)
                 view->map->resetPosition();
             break;
+        case GLFW_KEY_S:
+            if (view->changeStyleCallback)
+                view->changeStyleCallback();
+            break;
         case GLFW_KEY_R:
             if (!mods) {
                 view->map->setDefaultTransitionDuration(std::chrono::milliseconds(300));
@@ -306,6 +310,10 @@ void GLFWView::fps() {
     }
 }
 
+void GLFWView::setChangeStyleCallback(std::function<void()> callback) {
+    changeStyleCallback = callback;
+}
+
 namespace mbgl {
 namespace platform {