calling method of a webcontainer from thread

Databases
#1

Hi,

I have a Webcontainer which has Weblistview control on it, and a REFRESH Method to get fetch the data from the database.

Since fetching record from database is tedious specially for large record count, I want to implement THREAD to show PROGRESS WHEEL in front.

My question is:

How can I call the REFRESH method resided at the Webcontainer within the THREAD.RUN (I want to show the progress wheel where fetching records) ?

Anybody who already implemented this scenario? Please share.

1 Like
#2

Use a timer to refresh the progress bar. This is actually a very simple thing to do with the new framework. Have a method called ProgressBarUpdate or whatever you want to call it. Set it up like this:

Sub ProgressBarUpdate(value as Auto)
   Dim mValue as Integer = value
   ProgressBar1.value = value
End Sub

Now from your thread you execute this call whenever you want to update the progress bar:

dim mValue as Auto = SomeIntegerVariableOrProperty   

Xojo.Core.Timer.Calllater(0, AddressOf ProgressBarUpdate, mValue)

Now the timer will fire on the main thread and update your progress bar accordingly.

#3

Thanks for the reply.

But I prefer Progresswheel in a modal dialog.

Can I still use your sample above?

#4

Sure. But a progress wheel is always spinning and doesn’t need updates. So start the progress wheel when you start the thread. Then stop the progress wheel when the thread finishes.

#5

Thanks Jon,

So how can I do that in code? Can you please provide me sample?

"I have a Webcontainer which has Weblistview control on it, and a REFRESH Method to get fetch the data from the database.

Since fetching record from database is tedious specially for large record count, I want to implement THREAD to show PROGRESS WHEEL in front."

#6

So in your code BEFORE you start the thread (in fact put this the line before you call the run method of the thread) put:

ProgressWheel1.visible = True

When the thread finishes have a method that is called HideProgressWheel:

Sub HideProgressWheel
   ProgressWheel1.visible = False
End Sub

Now from the last line in the thread call:

Xojo.Core.Timer.CallLater(0, AddressOf HideProgressWheel)

There are no updates needed as the progress wheel is just a spinning thing.

#7

Hi Jon,

My progresswheel is at the dialogbox (modal).

Does this mean that my code should be.

thread eventhandler-

dim dlg as dlgPleaseWait
dlg.show

run()

Is this correct?

#8

Make sure your thread is a subclass of WebThread so it’ll be aware of the session it was started from.

#9

Yes, as long as you have any UI calls before the thread, I think your code should work just fine.

#10

Hi Guys,

I really really very thank full if you could provide me sample xojo project that works with tread+progress wheel+ webcontainer.

I cant make my experiment work.

Please???

#11

Hi Guys,

Anybody can provide me sample on how to use PROGRESS WHEEL while loading data to Weblistbox?

Please.

#12