Hello:
Sorry. A boring old desktop widget problem...
I have a QTableView.
I use a QStyledItemDelegate on each cell.
The delegate opens a custom, modal editor on double click.
The editor is based on a QDialog and contains a number of widgets,
one of which is a QComboBox.
When I press in the
If you are installing onto RHEL 6 as indicated in the case settings then this
is not supported
which would explain why it is having this problem, Qt was built on RHEL 7.4 for
Qt 5.12 as indicated here:
https://doc.qt.io/qt-5/supported-platforms.html
so you will need to upgrade in order
Hello:
My newer, Qt based drawing program takes orders of magnitude longer to draw
lines
than my good old plain X-Windows based drawing program.
The Qt call stack, as revealed by VTune, is:
QPainterPath::draw
QPaintEngineEx::draw
QRasterPaintEngine::stroke
QPaintEngineEx::stroke
Hello:
I have several users which are experiencing a problem
using my app, which uses QSettings.
It appears that sometimes the underlying settings configuration
file is does not appear to exist and the QSettings system resets
back to the beginning of time, loosing all settings.
All of my users
Hello:
I have been using Qt-5.7 for a while.
I needed a little help and knew it was no longer "supported"
so I initiated the process of upgrading to 5.10.1
(Yes, it is a process.)
With 5.10.1, one of my apps was crashing and down in a Qt source file.
I knew it could be my fault but, just to
get
Hello:
... on to the next problem...
For a while now I have been building on Windows
using the the Qt Visual Studio plug-in to import my .pro file.
Now, for some reason, I am getting this...
Does anyone know what might be wrong.
VS: 2015
Qt: 5.7.0
Thanks
Bill
Hello (No, this is not spam):
For me, the following:
QString a = "XXX";
QString b = "";
QString c = "";
QString d = "1";
qDebug() << QString("A: %1%2%3%4") .arg(a) .arg(b) .arg(c) .arg(d);
qDebug() << QString("B: %4%1%2%3") .arg(b) .arg(c) .arg(d) .arg(a);
prints this:
"A: XXX1"
I do this all of the time and it works fine.
QModelIndex index = createIndex(row,col);
emit dataChanged(index,index);
Have you tried it under 5.8.0RC?
It was working under 5.7.1 and before.
What value for column are you using?
For AbstractListModel, I was using 0 (zero)
I am
Hello:
I am porting my app to Qt 5.7
When I run it, it appears on the screen,
but there is a long pause (~10 secs.) before it is responsive.
I ran it with strace and there is a point where it makes
100K calls to the poll() function, which accounts for the long pause.
I tried running it in a
Hello:
I am trying to port two of my apps from Qt 4.8.6 to Qt 5.7.0
(I am also moving from RHEL5 to RHEL6 at the same time.)
I can build them and one appears to run properly, I just get a
little noise on start-up...
App #1:
XXX-lx01:app: App: *W*, failed to get the current screen resources
?
Is this intentional?
Am I doing something wrong?
I am still on 4.8.6, so excuse me if this is
a bug that has been fixed in 5.*
Thanks.
Bill
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Bill Crocker
Work: (781) 937-1382 (WILM 6500)
Home: (978) 686-3277
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I am trying to port my Qt project to a cmake based build so
I can use CLion for debugging.
Why is CLion preferable for you to do Qt debugging, opposed to
e.g. using Qt Creator?
Because CLion works out of the box and I am assuming
that I can use it to debug my app once I get it to build
Hello:
I am trying to port my Qt project to a cmake based build so
I can use CLion for debugging.
I am almost there, but when it links there are symbols undefined.
From my experience the symbols I am seeing are typical of missing moc files.
I know I have all of my #include "abc.moc" statements
Gang:
The doc for QAbstractItemModel::layoutAboutToBeChanged() says...
This signal is emitted just before the layout of a model is changed.
Components connected to this signal use it to adapt to changes in the
model's layout.
What is the "layout of a model" and how does that differ
Gang:
The doc shows this code as part of inserting a custom object into a
QTextDocument.
QTextCursor cursor = textEdit->textCursor();
cursor.insertText(QString(QChar::ObjectReplacementCharacter),
svgCharFormat);
textEdit->setTextCursor(cursor);
But, svgCharFormat now becomes
Hello:
Could someone please show me the few lines of code required
to add a list *of three elements* to a QTextDocument using low
level (i.e QTextBlock, QTextCursor, QTextList, etc.) classes.
Thanks.
--
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Hello:
I am working on a WYSIWYG editor.
The user needs to be able to enter macros which render
specially on the screen. For the purpose of this conversation,
pretend they enter "$DATE" which displays as "8-JAN" on the screen.
They are not allowed to edit the "8-JAN" directly. If they act to
rewrite.
See also: update, invalidate, and updateGeometry.
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Work: (781) 937-1382 (WILM 6500)
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Hello:
My very first Qt app is large and a little sloppy in
that the QWidget::update() function is being called
*someplace* where it should not, This is causing
unnecessary repaints.
Is there one place I can put a break to find the calls
which actually cause a repaint (and not the calls
which
Fellow Qt Enthusiasts:
It is happening again.
I have a client server/app which uses Qt for the socket communication.
Occasionally it gets sick. When it is sick:
1 - It takes multiple attempts for a client to connect to the server.
The connection attempts fail with: *ERROR*, server
Hello Gang:
I use a QTextDocument to format HTML
for display in a QGraphicsTextItem.
Text can be over-lined with:
ABC
Is there any way to control the width
and vertical position of the over-line
line segment?
It looks like the line thickness comes from
font_engine->lineThickness().
Can I
Hello:
I am having a text rendering problem.
The following code creates a QLabel and QGraphicsTextItem.
The QLabel text is 60 pt. The QGraphicsTextItem text size is 6 pt,
but then the view is scaled up by 10x. So, in the end both
pieces of text are the same size on the screen.
For me the QLabel
Dear Qt enthusiasts:
I am having a problem with my large,
distributed QT based client/server app.
It periodically appears as if the
server machine is under a SYN flood attack.
netstat -ts | grep -i syn
7563748 invalid SYN cookies received
75 resets received for embryonic SYN_RECV
Sure enough, If I Turn on ClearType
Start-ControlPane-Display-
AdjustClearTypeText/TurnOnClearType
The fonts are rendered anti-aliased.
But, I think I told Qt to override this with
painter.setRenderHint(QPainter::TextAntialiasing,true);
Also, I don't think a Display
Hello:
This is somewhat off topic, but I figured
you could all use a break from the non-stop QML channel. :-)
I have an app written with Qt which creates images.
I want to import these images into MS Word and then
be able to click on them in Word and have my app
appear to edit the image. Then,
Hello:
I have a multi-threaded, server application
which has been crashing in QProcess::waitForFinished(int)
The frequency is low compared to the work the
application does, but it *is* happening.
A back trace shows all other threads waiting
for something to do. Running with debug is not
an
how it works
and if I don't know how it works, I can't tailor it to my application.
In my case I want to simplify:
1 - Remove the component selection page.
2 - Remove the use of the Start Menu.
3 - Remove all of the options from the
uninstall page.
Thanks.
Bill
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Work: (781
Hello:
I have a server application that crashed 8 times
over the (long U.S.) weekend.
Back-traces from all core files showed the
same location (below).
This is a multi-threaded app, but traces of all other threads
showed them waiting either for a mutex, on a condition
or in a call to select.
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Work: (781) 937-1382 (WILM 6500)
Home: (978) 686-3277
List:
I am upgrading a project from Qt 4.7.1 to Qt 4.8.6
When I build this project on Windows, I now see this:
c:\qt\4.8.6\include\qtcore\../../src/corelib/global/qconfig.h(46) :
warning C4005: 'QT_LARGEFILE_SUPPORT' : macro redefinition
command-line arguments : see
Gang:
I have created my own item model by sub-classing QAbstractItemModel.
Functions like rowCount take a parent index so the model
knows for which index it is being asked to return the count.
This is good.
My model is hierarchical and different points in the hierarchy
have a different number
Hello:
Summary: I create a QGraphicsScene with a piece of text and a bounding
rectangle. I render to SVG, but the scene when viewed in Inkscape
and Firefox does not match what I saw on the screen.
I create the text item with a font
which is known to Inkscape and Firefox.
Qt Enthusiasts:
I have written a server app with Qt (4.7.1) and the image size grows over time.
Valgrind found this.
Are we missing a call to freeaddrinfo somewhere?
Bill
-
==30933== 595 (196 direct, 399 indirect) bytes in 7 blocks are definitely lost
in loss
Dear Qt Enthusiasts:
I am running my Qt app with a virtual X server on a compute farm as part of
regression testing.
Those instances still appear to want to work with the session manager on my
login host.
This fails and the following messages appear.
_IceTransSocketUNIXConnect: Cannot connect
On 04/22/2013 07:19 AM, Bo Thorsen wrote:
Hi Bill,
Den 22-04-2013 12:27, Bill Crocker skrev:
I am running my Qt app with a virtual X server on a compute farm as part of
regression testing.
Those instances still appear to want to work with the session manager on my
login host.
This fails
On 04/22/2013 07:43 AM, Bill Crocker wrote:
On 04/22/2013 07:19 AM, Bo Thorsen wrote:
Hi Bill,
Den 22-04-2013 12:27, Bill Crocker skrev:
I am running my Qt app with a virtual X server on a compute farm as part of
regression testing.
Those instances still appear to want to work
Wow. A non QML posting. How refreshing.
Did you remember to add /images/console.png etc. to
your resources file?
Also, QIcon is light weight, so you should use
QIcon and not Pointer-To-QIcon for things like
your consoleIcon_.
Bill
On 03/11/2013 04:55 AM, Sensei wrote:
Hi all,
I am adding to
On 03/11/2013 10:06 AM, Sensei wrote:
On 3/11/13 12:47 PM, Bill Crocker wrote:
Wow. A non QML posting. How refreshing.
Did you remember to add /images/console.png etc. to
your resources file?
Ah yes.
I use a QActionGroup when I need this behavior.
- Create QActionGroup.
- Set all actions
On 02/23/2013 04:40 PM, Joshua Grauman wrote:
Hello all,
I have a QTableWidget that uses a custom delegate. When I double click on
a cell, the editor comes up fine. But then I want to be able to pull up a
helper widget/window to enter data into the persistent editor. The problem
is, when I
Looks like you need a two plans of action:
1) figure out why it is taking 2 seconds loading: profile the loading and
propose patches to Qt.
2) implement the kdeinit / booster trick. I'm not sure there's a good
reference online, but here's a very, very summarised summary:
- all
On 11/06/2012 04:55 AM, Diego Iastrubni wrote:
On Wed, Oct 31, 2012 at 7:07 PM, Bill Crocker william.croc...@analog.com
mailto:william.croc...@analog.com wrote:
I am adding spell checking to my application.
I have the spell checking engine.
I can see how to use
Hello:
I am adding spell checking to my application.
I have the spell checking engine.
I can see how to use the QSyntaxHighlighter to
to underline words that are spelled incorrectly
in a QTextEdit.
I understand that I can configure a QTextEdit
to behave as a single line widget for use in
place
I could subclass QLineEdit and then override
the paint event, but I looked at the existing paint event
code and got scared. :-)
Alex
On Wed, Oct 31, 2012 at 10:07 AM, Bill Crocker
william.croc...@analog.com wrote:
Hello:
I am adding spell checking to my application.
I have the spell
Hello:
What did I do?
In my app, when I click in a section of the horizontal header a table view,
all items in the corresponding column are selected.
Is this a default behavior?
Must I have done something to enable this behavior?
How do I turn off this behavior?
Thanks.
Bill
On 08/07/2012 12:36 PM, BRM wrote:
I'm working on a QGraphicsWidget version of something I already have a
QWidget version of; namely because I need to add some features where I need
to overlay items, lines, and text in a way that QWidget does not support
You can also overlay your existing
On 07/21/2012 12:27 PM, Stephen Chu wrote:
I am working on a dynamically generated form. One thing I'd like to do
is to reflow the layout into multi-column when the widgets fill the
preset window height.
Hack alert...
Some Window Managers will let you bring a window up
off screen where it
On 06/27/2012 05:02 PM, Carl Schumann wrote:
Qt community.
I would like to allow the user to edit tab names in my application,
e.g., by right-clicking and then being given a text field to enter the
new name. How would this best be done please? Thanks for any help.
What have you tried?
On 05/23/2012 10:51 AM, Sensei wrote:
On 5/23/12 4:12pm, Konstantin Tokarev wrote:
Are your icons large enough for your size? They won't be scaled up.
Actually, I'm trying to use smaller icons.
This works for me:
void
MyApp::setAllIconSizes( QSize sz ) {
foreach( QWidget *wp,
On 03/29/2012 10:59 AM, Jason H wrote:
I hate to ask this, but have you rebooted?
Along that vein. There is a great sitcom called The IT Crowd
that came out of Great Britain. You can find it on Netflix.
The line Have you tried turning it off and on. is used
constantly. Must see.
Bill
And I'd
On 03/17/2012 03:09 PM, Joshua Grauman wrote:
Hello all,
Imagine a horizontal layout with 4 QLabels in it. The various QLabels have
different amounts of text that can vary quite a bit and can be changed
dynamically. I've been unable to get the horizontal layout/size policies
to size the
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