Qt-interest Archive, June 2007
Press Alt-PrintScreen for a MDI child snapshot?
Message 1 in thread
H All,
For a focused top widget window, press Alt-PrintScreen gives a snapshot
of the window itself. But this does not apply for a MDI child, where
Alt-PrintScreen always gives the whole MDI, not its child’s snapshot.
Then, I have to use a software to cut off, boring:(
Is there a way to get precise snapshot of a MDI child?
(I'm in WindowsXP, and the MDI can be QWorkspace/QMdiArea in a QMainWindow)
Thanks,
Lingfa
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Message 2 in thread
Hi Lingfa,
> Is there a way to get precise snapshot of a MDI child?
Yes it is. QWidget::render -- the swiss army render tool -- is very
handy in this case.
Something like this should do the trick:
...
QPixmap pixmap(subWindow->size());
subWindow->render(&pixmap);
pixmap.save("snapshot.png");
...
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Message 3 in thread
> Yes it is. QWidget::render -- the swiss army render tool -- is very
> handy in this case.
>
> Something like this should do the trick:
>
> ...
> QPixmap pixmap(subWindow->size());
> subWindow->render(&pixmap);
> pixmap.save("snapshot.png");
> ...
>
Bjoern Erik Nilsen,
Great! I get it. I put a slot to receive the trigger signal, and save
the snapshot as you suggested.
void MainWindow::snapshot()
{
QWidget *child = workspace->activeWindow();
if(!child) return;
QPixmap pixmap(child->size());
child->render(&pixmap);
pixmap.save("snapshot.png");
}
Very helpful! Thanks,
Lingfa
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Message 4 in thread
This mostly works. If your object is derived from QWidget, it works great.
However, if it is derived from QFrame (one example) the right and bottom
edges get clipped, and the image is offset by the frame edge. I am still
experimenting with how to get the QFrame part to render completely within
the QPixmap.
Keith
**Please do not reply to me, reply to the list.**
On 06-26-2007 11:03 AM, "Bjoern Erik Nilsen" wrote:
> Hi Lingfa,
>
>> Is there a way to get precise snapshot of a MDI child?
>
> Yes it is. QWidget::render -- the swiss army render tool -- is very
> handy in this case.
>
> Something like this should do the trick:
>
> ...
> QPixmap pixmap(subWindow->size());
> subWindow->render(&pixmap);
> pixmap.save("snapshot.png");
> ...
>
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Message 5 in thread
Keith Esau wrote:
>This mostly works. If your object is derived from QWidget, it works great.
>However, if it is derived from QFrame (one example) the right and bottom
>edges get clipped, and the image is offset by the frame edge.
>
Hi Keith Esau,
As I checked QFrame as a MDI child, there is no such a drawback as you
mentioned.
But I do find it does not work with QGLWidget at all. It gives a gray
empty rectangle.
Lingfa
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