hide and show FORMS without time delay

[Peter D.]

I created a MIDI-Form with a child forms.

When I click the command button (command1) on the currently shown Child form, in the background there are some calculations which take about 6 seconds. During this periode I want to hide the Child form and show an Form that indicates " Calculation please wait" So I placed the commands as followed:


Sub command1_click()

Form1.hide

Form2.shown (Form with label "Calculation please wait"


Different Iterations

......

Form2.hide

Form1.show

end sub


But instead of hiding the Form1 it is still visible

And of Form2 only the frame is visible.

What do I have to do to get the required result ????


Instead of hiding the FORM1 it would also be o.k. if the Form2 is visible on the top of Form1. Do you have any idea how to arrange the sequence of the forms

(bring to front, bring to back?????)


Thanks Peter

[Ravi Kiran]

Hi,


There are lot of ways to do this. Basically what is happening is this:

VB can paint forms/controls etc only when *it* gets the chance to do it!.

In your click event, you are saying - Form2.show , but by the time the form is shown the long loop of processing ( ~6sec) has already started, and the processor is busy doing it.

Simplest solution would be to give back the control to VB , and then start processing.


Put a couple of 'DoEvents' and if it still doesn't work, put a .Refresh command

i.e


Form1.hide

DoEvents

DoEvents

Form2.show

Form2.Refresh

DoEvents


.. and then the processing logic. It should do the trick


Or have a timer and do your calcs on the timer event. Set timers interval small enough not to be noticeble.

Form1.hide

Form2.show

Form2.ZOrder VbBringtofront '' if you want to to be visible for sure!

' put a timer in Form1, set the Enabled to False

timer1.interval = 100 ' - 100ms

timer1.enabled = true

' By the time timer starts VB gets good chance to do house keeping!

In form 1's timer1_event do the calcs. and after finishing unload Form2

private sub timer1_timer()

' do calcs. On end

unload form2

timer1.enabled = false '' IMP line, otherwise it will run multiple times!

end sub


Note : For this kind of processing the programing style has to change a little :

in the sense that you dont know when the cals are over etc.


Ravi

[Peter D.]

thanks Ravi for your explanations. I sounds verry good I will try it in the afternoon

[Peter D.]

It works exactly how you explained

thanks a lot Peter !