[求救]关于Delphi中控件的拖放（初次使用Delphi，望高人指点）

各位高人，感谢百忙之中浏览这个帖子。

小弟目前从事J2EE的开发，但是最近主管给了一个任务，需要使用Delphi完成，本人以前没有学Delphi。

我现在要做一个小Demo，但是其中有一个技术难点，希望高人指点，小弟不甚感激。时间比较紧，下个星期

一就要交Demo。

主要技术难点是：有没有一个控件，能显示从数据库里抓出来的数据（分行显示），又能被随意拖放。被放置

                                的地方要不要有一个什么控件，接收它？（我的环境是Delphi8）感谢您的不吝赐教。

需求如下：

1.  Define tables as follows:

    Table   WorkOrder

    PK   Work Order No.

         Item No.

         Expected Starting Date

         Work Order Qty

         Required Material Availability ("All" / "Partial" / "None")

    Table   Item Master

    PK   Item No.

         Item Category

         Production Capacity Per Day

2.  Graphical Display

    Select: Date range of Expected Starting Date. e.g. 2005/07/28 to 2005/08/15 

            Showing a table with columns of each day. e.g. 2005/07/28, 2005/07/29,

            2005/07/30, ... , 2005/08/15

            Grouping related work orders by the Item Category, and the expected

            starting date 

            For each Item Category, show the production capacity per day and

            the summed loading below the day    e.g. sum of Work Order Qty

            for work orders with Expected Starting Date = 2005/07/28,

            (which can be zero if no work order to be started on 2005/07/28)

            Below each Item Category/Item, show relevant work orders as movable

            rectangle box with text of work order no., the work order qty.

3.  Scroll control

    The graphical display shall allow user scrolling to different day horizontally

    or different item category and item no. vertically very easily. (whereas the

    date and the category/item shall always be visible).

4.  Drag and Drop of work order for production planning

    User may drag and drop the rectangle box from a day to the other.  Then, the

    graphical display shall be refreshed accordingly showing the newly summed

    loading.

5.  Saving the produciton planning

    When user click a [Save] button, the revised Expected Starting Date of work

    orders shall be updated accordingly.  Before that, user's work is only a

    worksheet draft copy.  If user is going to exit the program without saving,

    user shall be prompt if he wants to save it or not.

The concept is illustrated in the attahed Excel file

    

            (which can be zero if no work order to be started on 2005/07/28)

            Below each Item Category/Item, show relevant work orders as movable

            rectangle box with text of work order no., the work order qty.

3.  Scroll control

    The graphical display shall allow user scrolling to different day horizontally

    or different item category and item no. vertically very easily. (whereas the

    date and the category/item shall always be visible).

4.  Drag and Drop of work order for production planning

    User may drag and drop the rectangle box from a day to the other.  Then, the

    graphical display shall be refreshed accordingly showing the newly summed

    loading.

5.  Saving the produciton planning

    When user click a [Save] button, the revised Expected Starting Date of work

    orders shall be updated accordingly.  Before that, user's work is only a

    worksheet draft copy.  If user is going to exit the program without saving,

    user shall be prompt if he wants to save it or not.

The concept is illustrated in the attahed Excel file

    

            for work orders with Expected Starting Date = 2005/07/28,

            (which can be zero if no work order to be started on 2005/07/28)

            Below each Item Category/Item, show relevant work orders as movable

            rectangle box with text of work order no., the work order qty.

3.  Scroll control

    The graphical display shall allow user scrolling to different day horizontally

    or different item category and item no. vertically very easily. (whereas the

    date and the category/item shall always be visible).

4.  Drag and Drop of work order for production planning

    User may drag and drop the rectangle box from a day to the other.  Then, the

    graphical display shall be refreshed accordingly showing the newly summed

    loading.

5.  Saving the produciton planning

    When user click a [Save] button, the revised Expected Starting Date of work

    orders shall be updated accordingly.  Before that, user's work is only a

    worksheet draft copy.  If user is going to exit the program without saving,

    user shall be prompt if he wants to save it or not.

The concept is illustrated in the attahed Excel file

    

            (which can be zero if no work order to be started on 2005/07/28)

            Below each Item Category/Item, show relevant work orders as movable

            rectangle box with text of work order no., the work order qty.

3.  Scroll control

    The graphical display shall allow user scrolling to different day horizontally

    or different item category and item no. vertically very easily. (whereas the

    date and the category/item shall always be visible).

4.  Drag and Drop of work order for production planning

    User may drag and drop the rectangle box from a day to the other.  Then, the

    graphical display shall be refreshed accordingly showing the newly summed

    loading.

5.  Saving the produciton planning

    When user click a [Save] button, the revised Expected Starting Date of work

    orders shall be updated accordingly.  Before that, user's work is only a

    worksheet draft copy.  If user is going to exit the program without saving,

    user shall be prompt if he wants to save it or not.

The concept is illustrated in the attahed Excel file