init commit

archive/design pattern/command.cpp

@@ -0,0 +1,106 @@
+#include <iostream>
+#include <unordered_map>
+using namespace std;
+
+class Operate
+{
+public:
+    void Open()
+    {
+        cout << "打开" << endl;
+    }
+    void Create()
+    {
+        cout << "创建\n";
+    }
+    void Edit()
+    {
+        cout << "编辑\n";
+    }
+};
+
+class Command
+{
+public:
+    virtual void execute() = 0;
+};
+
+class OpenCommand : public Command
+{
+    Operate oper;
+
+public:
+    void execute()
+    {
+        oper.Open();
+    }
+};
+
+class EditCommand : public Command
+{
+    Operate oper;
+
+public:
+    void execute()
+    {
+        oper.Edit();
+    }
+};
+
+class CreateCommand : public Command
+{
+    Operate oper;
+
+public:
+    void execute()
+    {
+        oper.Create();
+    }
+};
+
+class MenuItem
+{
+    Command *command;
+
+public:
+    void setCommand(Command *command)
+    {
+        this->command = command;
+    }
+    void click()
+    {
+        command->execute();
+    }
+};
+
+class Menu
+{
+    unordered_map<string, MenuItem *> items;
+
+public:
+    void add(string name, MenuItem *m)
+    {
+        items[name] = m;
+    }
+    void click(string name)
+    {
+        items[name]->click();
+    }
+};
+
+int main()
+{
+    Menu *menu = new Menu();
+    MenuItem *open = new MenuItem(), *create = new MenuItem(), *edit = new MenuItem();
+    open->setCommand(new OpenCommand());
+    menu->add("open", open);
+    create->setCommand(new CreateCommand());
+    menu->add("create", create);
+    edit->setCommand(new EditCommand());
+    menu->add("edit", edit);
+
+    menu->click("open");
+    menu->click("create");
+    menu->click("edit");
+    return 0;
+}