Question

事情就是这样：我有一个管理用户门票的应用程序。我有2个基本类：票证和用户。使用GXT我有一些像这样的ColumnConfig类：

ColumnConfig<TicketProxy, String> dateColumn = new ColumnConfig<TicketProxy, String>(
        new ValueProvider<TicketProxy, String>() {
            public String getValue(TicketProxy object) {
                Date initialDate = object.getInitialDate();
                String date = "";
                if (initialDate != null) {
                    date = dtFormat.format(initialDate);
                }
                return date;
            }

            public void setValue(TicketProxy object, String initialDate) {
                if (object instanceof TicketProxy) {
                    object.setInitialDate(dtFormat.parse(initialDate));
                }
            }

            public String getPath() {
                return "initialDate";
            }
        }, 70, "Date");
columnsChamado.add(dateColumn);

但是我想从UserProxy类中获取一些数据，有些像这样：

ColumnConfig<UserProxy, String> userRoomColumn = new ColumnConfig<UserProxy, String>(
                new ValueProvider<UserProxy, String>() {
                    public String getValue(UserProxy object) {
                        String userRoom = object.getUserRoom();
                        String room = "";
                        if (userRoom != null) {
                            room = userRoom;
                        }
                        return room;
                    }

                    public void setValue(UserProxy object, String userRoom) {
                        if (object instanceof UserProxy) {
                            object.setUserRoom(userRoom);
                        }
                    }

                    public String getPath() {
                        return "userRoom";
                    }
                }, 70, "User's Room");
        columnsChamado.add(userRoomColumn);

但GWT不允许我将“Proxy”参数更改为同一ColumnConfig中的另一个类。

如何在此ColumnConfig中从其他Proxy类获取数据？

我使用GXT 3.0（Sencha）+ Hibernate。

代理类： BaseEntityProxy：

package com.acme.ccc.shared;

import com.acme.ccc.server.locator.CCCLocator;
import com.acme.db.base.DatabaseObject;

import com.google.web.bindery.requestfactory.shared.EntityProxy;
import com.google.web.bindery.requestfactory.shared.ProxyFor;
import com.google.web.bindery.requestfactory.shared.SkipInterfaceValidation;

@SkipInterfaceValidation
@ProxyFor(value = DatabaseObject.class, locator = CCCLocator.class)
public interface BaseEntityProxy extends EntityProxy {
    Long getId();
    Long getVersion();
    void setId(Long id);
    void setVersion(Long version);
}

TicketProxy：

package com.acme.ccc.shared.entityproxy;

import java.util.Date;
import java.util.List;

import com.acme.ccc.db.Ticket;
import com.acme.ccc.server.locator.CCCLocator;
import com.acme.ccc.shared.BaseEntityProxy;

import com.google.web.bindery.requestfactory.shared.ProxyFor;


@ProxyFor(value = Ticket.class, locator = CCCLocator.class)
public interface TicketProxy extends BaseEntityProxy {
    Date getPrazo();
    void setPrazo(Date prazo);

    TicketTipoProxy getTicketTipo();
    void setTicketTipo(TicketTipoProxy chamadoTipo);

    CanalOrigemProxy getCanalOrigem();
    void setCanalOrigem(CanalOrigemProxy canalOrigem);

    UserProxy getUser();
    void setUser(UserProxy user);

    CategoriaProxy getPedidoTipo();
    void setPedidoTipo(CategoriaProxy pedidoTipo);

    Date getInitialDate();
    void setInitialDate(Date dt);

    Long getTotal();
    void setTotal(Long total);

}

的userProxy：

package com.acme.ccc.shared.entityproxy;

import java.util.List;

import com.acme.ccc.db.User;
import com.acme.ccc.server.locator.CCCLocator;
import com.acme.ccc.shared.BaseEntityProxy;

import com.google.web.bindery.requestfactory.shared.ProxyFor;

@ProxyFor(value = User.class, locator = CCCLocator.class)
public interface UserProxy extends BaseEntityProxy {
    String getName();
    String getUserRoom();
    Long getTotal();

    void setName(String name);
    void setUserRoom(Sting room)
    void setTotal(Long total);
}

Answer 1

如果您有TicketProxy列，您可以从TicketProxy获取UserProxy吗？

ColumnConfig<TicketProxy, String> userRoomColumn = new ColumnConfig<TicketProxy, String>(
     new ValueProvider<TicketProxy, String>() {
          public String getValue(TicketProxy object) {
              String userRoom = object.getUser().getUserRoom();
              String room = "";
              if (userRoom != null) {
                  room = userRoom;
              }
              return room;
          }

          public void setValue(TicketProxy object, String userRoom) {
              object.getUser().setUserRoom(userRoom);
          }

          public String getPath() {
              return "user.userRoom";
          }
     }, 70, "User's Room");
columnsChamado.add(userRoomColumn);

Answer 2

gxt网格只能显示一种数据类型的数据。如果您放置一个TicketProxy行，您希望如何访问用户对象？

如果要独立显示故障单和用户（因此行是故障单或用户），则必须在网格中使用BaseEntityProxy：Grid<BaseEntityProxy>。然后，您可以将列定义为ColumnConfig<BaseEntityProxy, ?>并检查getter和setter中的类型：

List<ColumnConfig<BaseEntityProxy, ?>> columnsChamado = new ArrayList<ColumnConfig<BaseEntityProxy, ?>>();
ColumnConfig<BaseEntityProxy, String> dateColumn = new ColumnConfig<BaseEntityProxy, String>(
        new ValueProvider<BaseEntityProxy, String>() {

            private final DateTimeFormat dtFormat = DateTimeFormat.getFormat(DateTimeFormat.PredefinedFormat.DATE_FULL);

            public String getValue(BaseEntityProxy object) {
                Date initialDate =  ((TicketProxy) object).getInitialDate();
                String date = "";
                if (initialDate != null) {
                    date = dtFormat.format(initialDate);
                }
                return date;
            }

            public void setValue(BaseEntityProxy object, String initialDate) {
                if (object instanceof TicketProxy) {
                    ((TicketProxy) object).setInitialDate(dtFormat.parse(initialDate));
                }
            }

            public String getPath() {
                return "initialDate";
            }
        }, 70, "Date");

columnsChamado.add(dateColumn);

ColumnConfig<BaseEntityProxy, String> userRoomColumn = new ColumnConfig<BaseEntityProxy, String>(
        new ValueProvider<BaseEntityProxy, String>() {
            public String getValue(BaseEntityProxy object) {
                String userRoom = ((UserProxy)object).getUserRoom();
                String room = "";
                if (userRoom != null) {
                    room = userRoom;
                }
                return room;
            }

            public void setValue(BaseEntityProxy object, String userRoom) {
                if (object instanceof UserProxy) {
                    ((UserProxy)object).setUserRoom(userRoom);
                }
            }

            public String getPath() {
                return "userRoom";
            }
        }, 70, "User's Room");
columnsChamado.add(userRoomColumn);

ColumnModel<BaseEntityProxy> cm = new ColumnModel<BaseEntityProxy>(columnsChamado);

另一方面，如果您希望一个网格行显示用户和票证，则必须使用包装类：

class TicketWithUserProxy extends BaseEntityProxy{

    private UserProxy userProxy;
    private TicketProxy ticketProxy;

    public UserProxy getUserProxy() {
        return userProxy;
    }

    public void setUserProxy(UserProxy userProxy) {
        this.userProxy = userProxy;
    }

    public TicketProxy getTicketProxy() {
        return ticketProxy;
    }

    public void setTicketProxy(TicketProxy ticketProxy) {
        this.ticketProxy = ticketProxy;
    }
}

并相应地设置您的网格（Grid<TicketWithUserProxy>）：

List<ColumnConfig<TicketWithUserProxy, ?>> columnsChamado = new ArrayList<ColumnConfig<TicketWithUserProxy, ?>>();

ColumnConfig<TicketWithUserProxy, String> dateColumn = new ColumnConfig<TicketWithUserProxy, String>(
        new ValueProvider<TicketWithUserProxy, String>() {

            private final DateTimeFormat dtFormat = DateTimeFormat.getFormat(DateTimeFormat.PredefinedFormat.DATE_FULL);

            public String getValue(TicketWithUserProxy object) {
                Date initialDate =  object.getTicketProxy().getInitialDate();
                String date = "";
                if (initialDate != null) {
                    date = dtFormat.format(initialDate);
                }
                return date;
            }

            public void setValue(TicketWithUserProxy object, String initialDate) {
                object.getTicketProxy().setInitialDate(dtFormat.parse(initialDate));
            }

            public String getPath() {
                return "initialDate";
            }
        }, 70, "Date");

columnsChamado.add(dateColumn);

ColumnConfig<TicketWithUserProxy, String> userRoomColumn = new ColumnConfig<TicketWithUserProxy, String>(
        new ValueProvider<TicketWithUserProxy, String>() {
            public String getValue(TicketWithUserProxy object) {
                String userRoom = object.getUserProxy().getUserRoom();
                String room = "";
                if (userRoom != null) {
                    room = userRoom;
                }
                return room;
            }

            public void setValue(TicketWithUserProxy object, String userRoom) {
                object.getUserProxy().setUserRoom(userRoom);
            }

            public String getPath() {
                return "userRoom";
            }
        }, 70, "User's Room");
columnsChamado.add(userRoomColumn);
ColumnModel<TicketWithUserProxy> cm = new ColumnModel<TicketWithUserProxy>(columnsChamado);

如何从GXT ColumnConfig中的另一个EntityProxy获取数据？

2 个答案: