Qt-interest Archive, March 2002
Dialog problems (Qt 2.3.1, X11)
Message 1 in thread
Hi!
I am trying to write my own QProgressDialog replacement for the case
when I do not know the total amount of things that I need to count in
advance, showing a text label that would count upwards. However, I
cannot get it to work, the dialog simply will not display at all. This
is my class:
class ProgressText : public QSemiModal
{
Q_OBJECT
protected:
QLabel *progress;
public:
ProgressText(QWidget *parent, const char *name, const QString &title);
void setProgress(int number) { progress->setNum(number); }
};
with this constructor:
ProgressText::ProgressText(QWidget *parent, const char *name,
const QString &title)
: QSemiModal(parent, name, true)
{
QBoxLayout *vlayout = new QVBoxLayout(this);
QLabel *t = new QLabel(title, this);
vlayout->addWidget(t);
QBoxLayout *hlayout = new QHBoxLayout(vlayout);
progress = new QLabel("0", this);
hlayout->addWidget(progress);
QLabel *l = new QLabel(tr("message(s) read"), this);
hlayout->addWidget(l);
}
And here is where I create it:
progresstext = new ProgressText(this, "progress2", tr("Reading messages"));
progresstext->setCaption("apptitle");
progresstext->setEnabled(true);
progresstext->show();
progresstext->setFocus();
Everything seems to be created properly (no errors are reported when I
step through the constructor), but I never see the dialog on-screen. I
have fiddled around a bit with the different calls, of the last three
calls I originally only did call show(), adding setEnabled() and
setFocus() did not change anything.
Can anyone spot what I am doing wrong? I have been battling with this
for several hours now without being able to get it to work. I even
checked the sources for QProgressDialog to see if I did something very
much different, but it just seems to call show() to display itself.
I also first tried to have this as a subclass of QDialog, but that
didn't work either.
Any help would be greatly appreciated!
(Oh, yeah, and all this code is GPL'd)
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[ signature omitted ]
Message 2 in thread
Isn't the parent widget of ProgressText an object of
QWorkspace?
If an object of QDialog (or its subclass) is created with a
QWorkspace object as its parent, and the QWorkspace object
has been already shown, the dialog somehow never can be
visible.
For example:
MyMainWindow::MyMainWindow ()
{
QVBox* viewBack = new QVBox (this);
m_ws = new QWorkspace (viewBack);
setCentralWidget (viewBack);
QDialog* dlgA = new QDialog (ws, false);
dlgA->show ();
....
}
It makes dlgA visible, but,
void MyMainWindow::slotHoge ()
{
QDialog* dlgB = new QDialog (m_ws, false);
dlgB->show ();
....
}
dlgB never becomes visible.
You can make dlgB visible by calling dlgB->parentWidget
()->show (), but I think it would be a BUG of Qt.
Naoyuki
On 2002 March 14 Thursday 05:25, peter karlsson wrote:
> Hi!
>
> I am trying to write my own QProgressDialog replacement
> for the case when I do not know the total amount of
> things that I need to count in advance, showing a text
> label that would count upwards. However, I cannot get it
> to work, the dialog simply will not display at all. This
> is my class:
>
> class ProgressText : public QSemiModal
> {
> Q_OBJECT
> protected:
> QLabel *progress;
> public:
> ProgressText(QWidget *parent, const char *name,
> const QString &title); void setProgress(int number) {
> progress->setNum(number); } };
>
> with this constructor:
>
> ProgressText::ProgressText(QWidget *parent, const char
> *name, const QString &title)
>
> : QSemiModal(parent, name, true)
>
> {
> QBoxLayout *vlayout = new QVBoxLayout(this);
> QLabel *t = new QLabel(title, this);
> vlayout->addWidget(t);
> QBoxLayout *hlayout = new QHBoxLayout(vlayout);
> progress = new QLabel("0", this);
> hlayout->addWidget(progress);
> QLabel *l = new QLabel(tr("message(s) read"),
> this); hlayout->addWidget(l);
> }
>
> And here is where I create it:
>
> progresstext = new ProgressText(this, "progress2",
> tr("Reading messages"));
> progresstext->setCaption("apptitle");
> progresstext->setEnabled(true);
> progresstext->show();
> progresstext->setFocus();
>
> Everything seems to be created properly (no errors are
> reported when I step through the constructor), but I
> never see the dialog on-screen. I have fiddled around a
> bit with the different calls, of the last three calls I
> originally only did call show(), adding setEnabled() and
> setFocus() did not change anything.
>
> Can anyone spot what I am doing wrong? I have been
> battling with this for several hours now without being
> able to get it to work. I even checked the sources for
> QProgressDialog to see if I did something very much
> different, but it just seems to call show() to display
> itself.
>
> I also first tried to have this as a subclass of QDialog,
> but that didn't work either.
>
> Any help would be greatly appreciated!
>
> (Oh, yeah, and all this code is GPL'd)
Message 3 in thread
IKEGAMI Naoyuki:
> Isn't the parent widget of ProgressText an object of QWorkspace?
My parent widget is a subclass of QMainWindow.
> You can make dlgB visible by calling dlgB->parentWidget
> ()->show (), but I think it would be a BUG of Qt.
That looks like a weird solution. I'll have a look if it helps later.
Anyway, I have put a alpha version of the program up at
http://www.softwolves.pp.se/tmp/turqstat_2.3-alpha.tar.gz
The code in question is in qtprogress.cpp and qtprogress.h, and the dialog
is created from qtgui.cpp in InfoWindow::getProgressText()
To try the code out one needs to try opening something like a local news
spool (File | Open message base).
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