feat: add a new awesome feature

src/MessageBox.cpp

@@ -0,0 +1,32 @@
+#include "MessageBox.h"
+
+namespace StellarX
+{
+	MessageBoxResult MessageBox::ShowModal(Window& wnd,const std::string& text,const std::string& caption,
+		MessageBoxType type)
+	{
+		Dialog dlg(wnd, caption, text, type, true); // 模态
+		dlg.Show();
+		return dlg.GetResult();
+	}
+
+	void MessageBox::ShowAsync(Window& wnd,const std::string& text,const std::string& caption,MessageBoxType type,
+		std::function<void(MessageBoxResult)> onResult)
+	{
+		//去重，如果窗口内已有相同的对话框被触发，则不再创建
+		if (wnd.hasNonModalDialogWithCaption(caption))
+		{
+			std::cout << "\a" << std::endl; 
+			return;
+		}
+		auto dlg = std::make_unique<Dialog>(wnd, caption, text, type, false); // 非模态
+		Dialog* dlgPtr = dlg.get();
+
+		// 设置回调
+		if (onResult)
+			dlgPtr->SetResultCallback(std::move(onResult));
+		// 交给 Window 管理生命周期
+		wnd.addDialog(std::move(dlg));
+		dlgPtr->Show();
+	}
+}