Qt-interest Archive, April 2007
Drag resize problem when QMainWindow hosts a QAxWidget.
Message 1 in thread
I create a host window by subclassing QMainWindow, and create a
QAxWidget object as a central widget.
activeX = new QAxWidget(this);
activeX->setControl( classID());
this->setCentralWidget(activeX);
The QAxWidget is shown very well in the host window.
Problem is the host window, then, can only be dragged larger and larger,
but cannot be dragged smaller.
Does anyone know why, and how to fix it?
BTW, the QAxWidget itself is never given any minimum size hint
explicitly, and if itself shown in main() it is free to resize anyway.
Thanks,
Lingfa
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[ signature omitted ]
Message 2 in thread
Hi,
Lingfa Yang wrote:
> I create a host window by subclassing QMainWindow, and create a
> QAxWidget object as a central widget.
>
> activeX = new QAxWidget(this);
> activeX->setControl( classID());
> this->setCentralWidget(activeX);
>
> The QAxWidget is shown very well in the host window.
> Problem is the host window, then, can only be dragged larger and larger,
> but cannot be dragged smaller.
>
> Does anyone know why, and how to fix it?
>
> BTW, the QAxWidget itself is never given any minimum size hint
> explicitly, and if itself shown in main() it is free to resize anyway.
It sounds like one of two things is happening:
* The QAxWidget changes it's minimumSizeHint() to match it's size, or
* it changes it's sizeHint() and has a Fixed sized policy.
Could you check the results of these two functions after you resize the
QMainWindow?
Best regards,
Jacek
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[ signature omitted ]
Message 3 in thread
Jacek Surazski wrote:
>Hi,
>
>Lingfa Yang wrote:
>
>
>
>>I create a host window by subclassing QMainWindow, and create a
>>QAxWidget object as a central widget.
>>
>> activeX = new QAxWidget(this);
>> activeX->setControl( classID());
>> this->setCentralWidget(activeX);
>>
>>The QAxWidget is shown very well in the host window.
>>Problem is the host window, then, can only be dragged larger and larger,
>>but cannot be dragged smaller.
>>
>>Does anyone know why, and how to fix it?
>>
>>BTW, the QAxWidget itself is never given any minimum size hint
>>explicitly, and if itself shown in main() it is free to resize anyway.
>>
>>
>
>It sounds like one of two things is happening:
>* The QAxWidget changes it's minimumSizeHint() to match it's size, or
>* it changes it's sizeHint() and has a Fixed sized policy.
>
>Could you check the results of these two functions after you resize the
>QMainWindow?
>
>Best regards,
>
>Jacek
>
Jacek, you are right.
The minimumSizeHint keeps changing during resizing.
But it behaves different in horizontal and vertical resizing ---
In horizontal, drag-stretch, minimumSizeHint.width() increases, but NO
drag-shrink;
while in vertical, both drag-stretch and -shrink work, which make
minimumSizeHint.height() increases/decreases.
If I, explicitly, set a small minimum size, problem solved --- free to
resize (increase/decrease) in both horizontal and vertical.
void HostWin::resizeEvent ( QResizeEvent * event )
{
activeX->setMinimumSize(QSize(10,10));
}
Thanks,
Lingfa
--
[ signature omitted ]
Message 4 in thread
"Lingfa Yang" <lingfa@xxxxxxx> wrote in message
news:463106C1.4090000@xxxxxxxxxx
>I create a host window by subclassing QMainWindow, and create a QAxWidget
>object as a central widget.
>
> activeX = new QAxWidget(this);
> activeX->setControl( classID());
> this->setCentralWidget(activeX);
>
> The QAxWidget is shown very well in the host window.
> Problem is the host window, then, can only be dragged larger and larger,
> but cannot be dragged smaller.
>
> Does anyone know why, and how to fix it?
>
> BTW, the QAxWidget itself is never given any minimum size hint
> explicitly, and if itself shown in main() it is free to resize anyway.
>
> Thanks,
> Lingfa
Hi Lingfa,
We have seen that when using a QAxServer based control in QAxWidget, which
is a highly suboptimal setup anyway (why use ActiveX here?).
Can you confirm that this is the case for you as well? The respective
issue should be solved in 4.3.
Volker
--
[ signature omitted ]
Message 5 in thread
Volker Hilsheimer wrote:
>"Lingfa Yang" <lingfa@xxxxxxx> wrote in message
>news:463106C1.4090000@xxxxxxxxxx
>
>
>>I create a host window by subclassing QMainWindow, and create a QAxWidget
>>object as a central widget.
>>
>> activeX = new QAxWidget(this);
>> activeX->setControl( classID());
>> this->setCentralWidget(activeX);
>>
>>The QAxWidget is shown very well in the host window.
>>Problem is the host window, then, can only be dragged larger and larger,
>>but cannot be dragged smaller.
>>
>>Does anyone know why, and how to fix it?
>>
>>BTW, the QAxWidget itself is never given any minimum size hint
>>explicitly, and if itself shown in main() it is free to resize anyway.
>>
>>Thanks,
>>Lingfa
>>
>>
>
>Hi Lingfa,
>
>We have seen that when using a QAxServer based control in QAxWidget, which
>is a highly suboptimal setup anyway (why use ActiveX here?).
>
>Can you confirm that this is the case for you as well? The respective
>issue should be solved in 4.3.
>
>
>Volker
>
>
>
Hi, Volker,
Thanks for your reply
First, your writing “using a QAxServer based control in QAxWidget” is
not clear to me.
I am using a QAxServer based control, which is a QAxWidget, in QMainWindow.
(The resizeing problem has been solved with the help from Jacek Surazsk)
This is just a test case of the ActiveX control. The goal of developing
ActiveX controls, in my practice at least, is for automating/programming
MS Office, for examples, insert them into PowerPoint to enhance/extend
features of presentations; create template PowerPoint.
The attached figure explains the work flows:
Path 1: QWidget to QApplication (normal cases: you develop ur widgets,
and you use them in your application.)
Path 2: QWidget + QAxBindable => ActiveX, then, use ActiveX to build an
application (test case of ActiveX, not target on any real application)
Path 3: QWidget + QAxBindable => ActiveX, use ActiveX in MS office
(program Office, make interactive presentation, smart document, . . . by
VBA, MFC, VSTO ... why not Qt? I welcome any progress in ActiveQt
Framework along this direction.)
Thanks,
Lingfa
