[Qt-interest] QProgressBar kind of functionality withQProgressDialog (Size of file being copied not known)

[Chandru...]

why cant we try setting range instead of value of QProgressDialog ...
Set the range to (0,0) in the first place (before calling setValue).........

On Fri, May 29, 2009 at 3:39 PM, Usman Ajmal <uzmanajmal at gmail.com> wrote:

> Ahaan...thanks Chandru
>
>
> On Fri, May 29, 2009 at 3:08 PM, Chandru... <sekarwagmare at gmail.com>wrote:
>
>> event loop is the basic of qt .. this will be very important for u ....
>> when u are donig heavy projects ..
>>     study this
>>  http://doc.trolltech.com/qq/qq27-responsive-guis.html
>>
>> the best guide from mr. wysota ...
>>
>>
>>
>>
>>
>> On Fri, May 29, 2009 at 3:31 PM, Usman Ajmal <uzmanajmal at gmail.com>wrote:
>>
>>> Many thanks Ben.
>>>
>>> Frankly i din get any help from those posts :)
>>> Could not understand how do i use event loops. Anyways i am looking into
>>> it. lets see.
>>>   On Thu, May 28, 2009 at 11:09 PM, Ben Swerts <benswerts at telenet.be>wrote:
>>>
>>>>
>>>> HI Usman,
>>>>
>>>> I hope you understood from the other posts that you need to let the
>>>> eventloop spin (e.g. QApplication::processEvents) such that the
>>>> QProgressDialog can be shown. There are, however, a few other caveats
>>>> you
>>>> should be aware of:
>>>>
>>>> - QProgressDialog is only shown after the specified minimumDuration().
>>>> The
>>>> default value is 4 seconds, but as you mentioned that the process runs
>>>> for a
>>>> few minutes you don't have to worry about that.
>>>>
>>>> - The progress bar can be made moving by setting the same minimum and
>>>> maximum value. I had to perform a workaround (Qt 4.3.3) to actually get
>>>> it
>>>> to move in the QProgressDialog:
>>>>
>>>>  progressDialog->setRange(0, 1);
>>>>  progressDialog->setValue(0);
>>>>  progressDialog->setRange(0, 0);
>>>>
>>>> I don't know whether this fix is still needed with the latest version of
>>>> Qt.
>>>>
>>>> Hope it helps.
>>>> Greets,
>>>>
>>>>
>>>>        Ben
>>>>
>>>> > Let me rephrase my question:
>>>> >
>>>> > Can i show the progress of my operation with the help of a blue fluid
>>>> > moving to and from in the bar of QProgressDialog?
>>>> >
>>>> > I want such functionality because i don't know the size of the
>>>> operation.
>>>> >
>>>> > I went through QProgressDialog class reference but invain. Kindly
>>>> suggest
>>>> > something.
>>>> >
>>>> > Thanks
>>>> >
>>>> >
>>>> > On Mon, May 25, 2009 at 12:33 PM, Usman Ajmal <uzmanajmal at gmail.com>
>>>> > wrote:
>>>> >
>>>> >
>>>> >       Hi,
>>>> >       I set setMaximum() and setMinimum(), of QProgressBar, equal to
>>>> zero
>>>> > which gave be the ability to show a kinda progress without showing the
>>>> > percentage of the operation completed. It only showed a blue fluid
>>>> moving
>>>> > to and from in the bar which showed that something is being copied.
>>>> >
>>>> >       Now i want to have the same kind of progress presentation with
>>>> > QProgressDialog but i could not see anything showing up when i start
>>>> the
>>>> > operation. I don't see even the dialog.
>>>> >
>>>> >       Following z the snippet from my code: In following code 'line'
>>>> is
>>>> > QString and 'image' is QTextStream.
>>>> >
>>>> >       QProgressDialog progress("Copying files...", "Abort Copy", 0, 0,
>>>> > this);
>>>> >       while (!line.isNull())
>>>> >                   {
>>>> >                       if (progress.wasCanceled())
>>>> >                            break;
>>>> >                       line = in.readLine();
>>>> >                       image<<line<<endl;
>>>> >
>>>> >                   }
>>>> >
>>>> >       What else do i need to add here?
>>>> >
>>>> >       Thanks.
>>>> >
>>>> >       --
>>>> >       Usman
>>>> >
>>>> >
>>>>
>>>>
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>>>>
>>>
>>>
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>>>
>>
>>
>> --
>> WAGMARE
>>
>>
>>
>


-- 
WAGMARE
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