visual foxpro 7.txt

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Visual FoxPro 5.0表单清屏特技

    在使用Visual FoxPro 5.0编制应用程序时，‘表单’大概是最常用的组成部份，然而，时间一久，自然会有点厌了它那个一闪即现、转眼即逝的风格。笔者于是试着改变表单的启动和关闭的方式，效果还算不错，有兴趣的读者不妨一试。

    首先要进入Visual FoxPro 5.0系统环境中，建立一个新的表单（Form1），然后再在表单上建立一个‘计时器’控件（Timer1），设置Timer1的InterVal属性为100ms。接下来的工作就是为表单和计时器控件加入事件响应的代码：

启动表单 
由左至右展开表单。 
Form1的Load方法：

Public F_wid,I

F_WID = Thisform.Width

Thisform.Width = 0

I = 104

Timer1的Timer方法：

If I > F_wid

Thisform.Timer1.Enabled = .F.

Return

Endif

Thisform.Width = I

I = I + 10

由右至左展开表单。 
Form1的Load方法：

Public F_wid,I

F_wid = Thisform.Width

Thisform.Left = Thisform.Left + F_wid - 104

Thisform.Width = 0

I = 104

Timer1的Timer方法：

If I >= F_wid

Thisform.Timer1.Enabled = .F.

Return

Endif

Thisform.Left = Thisform.Left - 10

Thisform.Width = I

I = I + 10

由上至下展开表单。 
Form1的Load方法：

Public F_hei,I

F_hei = Thisform.Height

Thisform.Height = 0

I = 0

Timer1的Timer方法：

If I >= F_hei

Thisform.Timer1.Enabled = .F.

Return

Endif

Thisform.Height = I

I = I + 10

由下至上展开表单。 
Form1的Load方法：

Public F_hei,I

F_hei = Thisform.Height

Thisform.Height = 0

Thisform.Top = Thisform.Top + F_hei

I = 0

Timer1的Timer方法：

If I >= F_hei

Thisform.Timer1.Enabled = .F.

Return

Endif

Thisform.Top = Thisform.Top - 10

Thisform.Height = I

I = I + 10

由左上角向右下角展开表单。 
Form1的Load方法：

Public F_hei,F_wid,I

F_hei = Thisform.Height

F_wid = Thisform.Width

Thisform.Height = 0

Thisform.Width = 0

I = 0

Timer1的Timer方法：

If I >= F_hei

Thisform.Timer1.Enabled = .F.

Return

Endif

Thisform.Height = I

Thisform.Width = I * F_wid / F_hei

I = I + 10

由左下角向右上角展开表单。 
Form1的Load方法：

Public F_hei,F_wid,I

F_hei = Thisform.Height

F_wid = Thisform.Width

Thisform.Height = 0

Thisform.Width = 0

Thisform.Top = Thisform.Height + F_hei

I = 0

Timer1的Timer方法：

If I >= F_hei

Thisform.Timer1.Enabled = .F.

Return

Endif

Thisform.Top = Thisform.Top - 10

Thisform.Height = I

Thisform.Width = I * F_wid / F_hei

I = I + 10

二、关闭表单

1、由左至右关闭表单。

Form1的Load方法：

Public F_wid,F_left

F_wid = Thisform.Width

F_left = Thisform.Left

Timer1的Timer方法：

If F_wid <= 100

Thisform.Timer1.Enabled = .F.

Thisform.Release

Endif

Thisform.Width = F_wid

Thisform.Left = F_left

F_wid = F_wid - 10

F_left = F_left + 10

2、由右至左关闭表单。

Form1的Load方法：

Public F_wid

F_wid = Thisform.Width

Timer1的Timer方法：

If F_wid <= 104

Thisform.Timer1.Enabled = .F.

Thisform.Release

Endif

Thisform.Width = F_wid

F_wid = F_wid - 10

由下至上关闭表单。 
Form1的Load方法：

Public F_hei

F_hei = Thisform.Height

Timer1的Timer方法：

If F_hei <= 10

Thisform.Timer1.Enabled = .F.

Thisform.Release

Endif

Thisform.Height = F_hei - 10

F_hei = F_hei - 10

4、由上至下关闭表单。

Form1的Load方法：

Public F_hei

F_hei = Thisform.Height

Timer1的Timer方法：

If F_hei <= 10

Thisform.Timer1.Enabled = .F.

Thisform.Release

Endif

Thisform.Top = Thisform.Top + 10

Thisform.Height = F_hei

F_hei = F_hei - 10

5、由右上角向左下角关闭表单。

Form1的Load方法：

Public F_hei,F_wid,I

F_hei = Thisform.Height

F_wid = Thisform.Width

I = F_hei

Timer1的Timer方法：

If F_hei <= 10

Thisform.Timer1.Enabled = .F.

Thisform.Release

Endif

Thisform.Top = Thisform.Top + 10

Thisform.Height = F_hei

Thisform.Width = F_hei * F_wid / I

F_hei = F_hei - 10

由右下角向左上角关闭表单。 
Form1的Load方法：

Public F_hei,F_wid,I

F_hei = Thisform.Height

F_wid = Thisform.Width

I = F_hei

Timer1的Timer方法：

If F_hei <= 10

Thisform.Timer1.Enabled = .F.

Thisform.Release

Endif

Thisform.Height = F_hei

Thisform.Width = F_hei * F_wid / I

F_hei = F_hei - 10

    以上程序在Windows 95和Visual FoxPro 5.0中运行通过。

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