Route prepared file saves through platform services

src/app_events.cpp

@@ -31,11 +31,6 @@ namespace {
 
 }
 
-#ifdef __WEB__
-void webgl_pick_file_save(const std::string& path, 
-    const std::string& name, std::function<void(bool)> callback);
-#endif
-
 namespace {
 
 [[nodiscard]] pp::platform::PlatformServices& active_platform_services()
@@ -187,10 +182,7 @@ void App::pick_file_save(const std::string& type, const std::string& default_nam
     std::string path = tmp_path + "/" + default_name + ext;
     std::thread([=]{
         writer(path);
-        dispatch_async(dispatch_get_main_queue(), ^{
-            [ios_view pick_file_save:path];
-        });
-        callback(path, true);
+        save_prepared_file(path, default_name + ext, callback);
     }).detach();
 }
 #elif __WEB__
@@ -201,7 +193,7 @@ void App::pick_file_save(const std::string& type, const std::string& default_nam
     auto path = data_path + "/" + default_name + "." + type;
     LOG("App::pick_file_save %s", path.c_str());
     writer(path);
-    webgl_pick_file_save(path, default_name + "." + type, callback);
+    save_prepared_file(path, default_name + "." + type, std::move(callback));
 }
 #else
 void App::pick_file_save(std::vector<std::string> types, std::function<void(std::string)> callback)
@@ -236,6 +228,19 @@ void App::share_file(std::string path)
     active_platform_services().share_file(path);
 }
 
+void App::save_prepared_file(
+    std::string path,
+    std::string suggested_name,
+    std::function<void(const std::string& path, bool saved)> callback)
+{
+    active_platform_services().save_prepared_file(
+        path,
+        suggested_name,
+        [callback = std::move(callback)](std::string saved_path, bool saved) {
+            callback(saved_path, saved);
+        });
+}
+
 bool App::mouse_down(int button, float x, float y, float pressure, kEventSource source, bool eraser)
 {
     redraw = true;