bbs project statistics
  ------------------------
     31 c++ source files.
     27 c++ header files.
   4973 总计 lines code.

所有复杂可控图形元素继承自 Widget 接口
class Widget {
public:
    Widget();
    virtual int processEvent(Client&, Event);
    virtual ~Widget();
};


举例：
class Menu : public Widget {
private:
    std::vector<MenuItem> _menu_items;
    int _start_row;
    int _start_col;
    int _width;
    int _select;
    void draw(Client&, bool force);
public:
    Menu() : _start_row(-1), _start_col(-1), _width(0), _select(0) { }

    void setStartRow(int r) { _start_row = r; }
    void setStartCol(int c) { _start_col = c; }
    void setWidth(int w) { _width = w; }
    int getResult()  { return _select; }

    void addItem(int key, char shortCut, String label);

    int processEvent(Client&, Event);
};

另例：
class VI : public Widget {
private:
    Text m_text;
    int m_width, m_height, m_offset, m_row, m_col;

    void view_update_footer(Client& client, bool force);
    void view_update_body(Client& client, bool force);
    void model_update_col(Client& client);
    void on_key_right(Client& client);
    void on_key_left(Client& client);
    void on_key_up(Client& client);
    void on_key_down(Client& client);
    void on_key_home(Client& client);
    void on_key_end(Client& client);
    void on_key_del(Client& client);
public:
    VI();
    void setWidth(int);
    void setHeight(int);
    int processEvent(Client&, Event);
};

再例：
class Notepad : public Widget {
private:
    Text m_text;
    int m_width, m_height, m_offset, m_row, m_col;
    void view_update_footer(Client& client, bool force);
    void view_update_body(Client& client, bool force);
    void model_update_col(Client& client);
public:
    Notepad();
    void setWidth(int);
    void setHeight(int);
    int processEvent(Client&, Event);
};

app 层调用：
比如浏览text控件的接口设计和调用：
class TextViewer : public Widget {
private:
    Text m_text;
    int m_width, m_height, m_offset;
    void view_update_footer(Client& client, bool force);
    void view_update_body(Client& client, bool force);
public:
    TextViewer();
    void setWidth(int);
    void setHeight(int);
    int processEvent(Client&, Event);
    Text& text() {
        return m_text;
    }

};

void state_topic_content(Client& client, Event event)
{
    if (event.type == EV_INIT) {
        TextViewer *textViewer = new TextViewer;
        int topicid = client.getIntProperty("topicid");
        BBS::instance()->loadTopicContent(topicid, textViewer->text());
        client.setController(textViewer);
    }

    int response = client.processWidgetEvent(event);
    if (response == R_DONE) {
        client.backward();
    }
}

-----------------
目前设计单一状态单一控件
如果gui部分要求复杂，可以扩展为单状态多控件，每个控件可以用字符串指定id
或者用整形指定id，根据id设定focus顺序，生成如下界面


username: [__________] <-entry_field0
password: [__________] <-entry_field1
email:    [__________] <-entry_field2
..
[submit] [cancel]  <-button0 button1
..
根据操作在各个控件间转换阵地

可以使用类似frame或者form可容器控件管理


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