Add display manager and display event listeners to example

Author: lijy91

examples/window_example/main.cpp

@@ -2,21 +2,27 @@
 #include "nativeapi.h"
 
 using nativeapi::AppRunner;
+using nativeapi::Display;
+using nativeapi::DisplayAddedEvent;
+using nativeapi::DisplayManager;
+using nativeapi::DisplayRemovedEvent;
 using nativeapi::Tray;
 using nativeapi::TrayManager;
 using nativeapi::Window;
 using nativeapi::WindowManager;
 using nativeapi::WindowOptions;
 
 int main() {
+  DisplayManager display_manager = DisplayManager();
   TrayManager tray_manager = TrayManager();
   WindowManager window_manager = WindowManager();
 
   // Create a new window with options
-  WindowOptions options;
-  options.title = "My Window";
-  options.size.width = 800;
-  options.size.height = 600;
+  WindowOptions options = {.title = "Window Example",
+                           .size = {800, 600},
+                           .minimum_size = {400, 300},
+                           .maximum_size = {1920, 1080},
+                           .centered = true};
   std::shared_ptr<Window> window_ptr = window_manager.Create(options);
 
   std::shared_ptr<Tray> tray_ptr = tray_manager.Create();
@@ -29,6 +35,15 @@ int main() {
     std::cerr << "Failed to create tray." << std::endl;
   }
 
+  display_manager.AddListener<nativeapi::DisplayAddedEvent>(
+      [](const nativeapi::DisplayAddedEvent& event) {
+        std::cout << "Display added: " << event.GetDisplay().id << std::endl;
+      });
+  display_manager.AddListener<nativeapi::DisplayRemovedEvent>(
+      [](const nativeapi::DisplayRemovedEvent& event) {
+        std::cout << "Display removed: " << event.GetDisplay().id << std::endl;
+      });
+
   AppRunner runner;
   runner.Run(window_ptr);
 

src/app_runner.cpp

@@ -1,7 +1,3 @@
 #include "app_runner.h"
-#include <iostream>
 
-namespace nativeapi {
-
-
-}  // namespace nativeapi
+namespace nativeapi {}  // namespace nativeapi