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数据库人员手册之编辑VFP选单问题集锦

Jun 07, 2016 pm 03:17 PM
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欢迎进入Oracle社区论坛,与200万技术人员互动交流 >>进入 由于工作关系,笔者常常接触微软的数据库开发工具VFP,并用于开发一些常见的应用系统,其中,编制功能完善的选单栏是VFP应用开发中最常见的任务之一。 功能完善的选单栏是系统界面的重要组成部分,

欢迎进入Oracle社区论坛,与200万技术人员互动交流 >>进入

  由于工作关系,笔者常常接触微软的数据库开发工具VFP,并用于开发一些常见的应用系统,其中,编制功能完善的选单栏是VFP应用开发中最常见的任务之一。

  功能完善的选单栏是系统界面的重要组成部分,是应用程序设计是否友好的一个重要体现。

  编辑选单中常见的问题有:设置访问键、分隔符、快捷键、标记、失效状态等。

  下面笔者将介绍它们在VFP中的实现方法。

  1.给选单定义访问键

  访问键可使系统使用者用键盘操作选单中的命令。
  要想给选单添加访问键,在选单编辑过程中给选单名称后加“(<F)”就可以了,注意“F”是根据需要填写的。

  2.给选单命令定义快捷键及添加提示信息

  快捷键可完善选单的功能,提高系统操作时的速度。提示信息使得系统使用人员更快地了解选单功能。
  要想给选单项定义,可在选单编辑过程中,单击“选项”下的按钮,将弹出对话框,在提示处按下要定义的键就可以了。要添加提示信息则在其中的“信息(G):”右侧的框中填入要提示的信息并用字符串引号引起来即可。

  3.给选项打或去掉“√”标记

  mrkbar()是判断选单是否被打标记的一个函数,若已选返回值为真,否则为假。配合使用命令setmarkof可把选单项打上或去掉标记。
  例如下面一段命令加在选单过程里面就可给打上或去掉“√”标记:
  if!mrkbar("文件f",3)
  setmarkofbar2of文件fto.t.
  命令
  else
  setmarkofbar2of文件fto.f.
  命令
  endif


  4.给选单加分隔符

  分隔线可增强选单的可读性,要想实现加分隔线的效果,只要在选单编辑过程中给“选单名称”项中加入“-”符号即可。

5.让某一个选单标题或选项暂时失效并恢复

  在程序运行过程中有时需要让某一个选单暂时失效,失效后需要时还能恢复,实现方法有两种:

  (1)使用命令setskipof
  例如,使图1中“文件”选单标题暂时失效的命令为:
  setskipofpopup文件f.t.

  恢复命令为:
  setskipofpopup文件f.f.

  使图1中“文件”下的第二项暂时失效的命令为:
  setskipofbar2of文件f.t.
  恢复命令为:
  setskipofbar2of文件f.f.

  (2)使用命令releasepopup

数据库人员手册之编辑VFP选单问题集锦

图1.普通选单各部分名称

  例如,要使图1中“文件”选单暂时失效,可使用命令:
  releasepopup文件f

  想恢复失效的选单,再调用一次就可以了,例如选单文件名为cd1.mpx,使用命令:
  docd1.mpx

  6.给选单添加系统选单选项

数据库人员手册之编辑VFP选单问题集锦

图2.选单设计器

  在VFP6.0中有许多现成的系统选单选项供开发者选用,使用它们可丰富选单的功能,从而完善系统的功能。

数据库人员手册之编辑VFP选单问题集锦

图3.选单选项的快捷键设置

  添加方法是在选单编辑时单击“插入栏…”按钮,就会弹出图4所示的对话框,在其中选择需要的系统选单选项即可。

数据库人员手册之编辑VFP选单问题集锦

图4.系统选单选项

数据库人员手册之编辑VFP选单问题集锦

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