Qt-interest Archive, July 2007
Drag and Drop: Dropping onto a QAxWidget
Message 1 in thread
I have a form which contains a QAxWidget (that loads the Internet
Explorer control), how do I enable the widget which contains this
to handle drop events? Right now, drops on other parts of the
containing widget work, although over the QAxWidget I get the
'cannot drop' icon.
For example, in the webbrowser example in
Qt-3.3.7\extensions\activeqt\examples\webbrowser, the browser
loads any file that is dragged onto it. I'd like to have the
containing widget handle the drops.
I've tried,
browserControl->setProperty( "RegisterAsDropTarget",
QVariant( FALSE, 0 ) );
which disabled the browser from opening the file dropped on it,
but it didn't pass the event on to the form.
I also tried the above along with,
browserControl->setAcceptDrops( false );
but that didn't work either.
Is it possible to do this at all? Any help would be appreciated.
Thanks.
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Message 2 in thread
http://lists.trolltech.com/qt-interest/2005-10/msg01020.html
That thread may help. It seems subclassing ActiveX and overriding
mouse/drop events won't work. My only other idea (which may be
overkill), is to superimpose a transparent widget over the ActiveX
widget. By doing this, you can intercept the mouse/drop events and do
what you need to with them or delegate them to the ActiveX widget
itself. Haven't done this myself but it's an idea.
chris burke
phone: 617-621-0060 x195
email: cburke@xxxxxxx
skype: chris.burke0
Roshan Mathews wrote:
> I have a form which contains a QAxWidget (that loads the Internet
> Explorer control), how do I enable the widget which contains this
> to handle drop events? Right now, drops on other parts of the
> containing widget work, although over the QAxWidget I get the
> 'cannot drop' icon.
>
> For example, in the webbrowser example in
> Qt-3.3.7\extensions\activeqt\examples\webbrowser, the browser
> loads any file that is dragged onto it. I'd like to have the
> containing widget handle the drops.
>
> I've tried,
>
> browserControl->setProperty( "RegisterAsDropTarget",
> QVariant( FALSE, 0 ) );
>
> which disabled the browser from opening the file dropped on it,
> but it didn't pass the event on to the form.
>
> I also tried the above along with,
> browserControl->setAcceptDrops( false );
> but that didn't work either.
>
> Is it possible to do this at all? Any help would be appreciated.
>
> Thanks.
>
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Message 3 in thread
Chris Burke wrote:
> http://lists.trolltech.com/qt-interest/2005-10/msg01020.html
>
Thanks, I did come across that before I mailed. I'm not
subclassing QAxWidget anyway, it is a member of a larger form.
> That thread may help. It seems subclassing ActiveX and overriding
> mouse/drop events won't work. My only other idea (which may be
> overkill), is to superimpose a transparent widget over the ActiveX
> widget. By doing this, you can intercept the mouse/drop events and do
> what you need to with them or delegate them to the ActiveX widget
> itself. Haven't done this myself but it's an idea.
>
We had thought of this too. Correct me if I'm wrong, but only top
level widgets can be made transparent (with
QWidget::setWindowOpacity). So, I had a transparent QDialog which
I turned on/displayed whenever a drag enter was fired on the
containing form, but when it crosses the border into the QAxWidget
inside, a drag leave is called on the containing form, and I've
added code to remove the transparent widget at that point. So
that doesn't help. We can maybe check if the drag leave on the
main form is followed by a drag enter on the transparent widget,
but that seems kinda hackish, I just wanted to know if there is
another way to accomplish this.
Thanks again for your help.
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