Re: [PyQt] Composite widgets?
Hi Peter, I find that a lot of my use with PyQt is composing compound widget subclasses that combine other widgets in a particular arrangement and behaviour that I need. You can easily design the way they behave in terms of signals emitted, and you can capture mouse and keyboard events simply by overriding particular methods from the base QWidget class. Not sure if there are many pre-existing libraries of these (that I know). Perhaps because it's easy to do once you get the hang of it. For example, to make a combined label and line edit: class myTextField(QWidget): def __init__(self,label=My Text Field, parent=None): super(myTextField,self).__init__(parent) layout = QHBoxLayout() self.label = QLabel(label) layout.addWidget( self.label ) self.lineEdit = QLineEdit() layout.addWidget( self.lineEdit ) self.setLayout( layout ) You can get much more sophisticated than this, but just a quick example really. Hope this helps. Dan On 6 September 2010 02:13, Peter Milliken peter.milli...@gmail.com wrote: Prior to embarking on learning PyQt, I wrote my GUI applications using Tkinter and Pmw. The Pmw widget set is quite nice and provides a library of composite classes using the Tkinter widgets. My question is: Is there any (similar) composite widgets in PyQt? i.e. Pmw has the EntryField widget, which combines the (commonly used case) of a Label and a LineEdit into the one class - much more convenient than always having to specify the two entities separately, which seems to be the case with PyQt? The EntryField widget offers far more than just conveniently creating a Label and a LineEdit in the one class, it also allows definition of entry validation as well, so you can see that the composite classes provide quite a high level of functional behaviour to the user. Pmw defines other composite widgets like: RadioSelect - which groups radio buttons (well, you have the choice of defining it to handle radio buttons, check buttons or normal buttons). Of course in PyQt I have found the QGroupBox class, but this only performs a (small) part of what the Pmw RadioSelect widget does. Do such composite widgets exist? am I missing something in the PyQt documentation? Thanks Peter ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
Re: [PyQt] Composite widgets?
On having a quick look at pmw, I can definitely say that a lot of that functionality is available as PyQt native widgets (plus much much more) and the few exceptions would be able to be made with code not much more complex than the example I gave. It may seem overwhelming at first, but it would be a good way to learn PyQt and python as well I reckon ;-) Cheers Dan On 6 September 2010 11:18, Peter Milliken peter.milli...@gmail.com wrote: Thanks Dan, but I was really looking for something much more elaborate :-) The structure of the Pmw library/widgets is difficult to describe, but I found it an amazingly powerful library that allow some pretty nice (and easy) extensions once you understood how it worked. Whilst I have never delved into the inner workings, I might try some form of a basic port of the code to PyQt (assuming there is nothing else available) - I'll have to look into it, because I suspect it might be a pretty big job! It will certainly stretch my knowledge of Python! :-) Thanks anyway, Peter On Mon, Sep 6, 2010 at 5:16 PM, Dan Kripac dankri...@gmail.com wrote: Hi Peter, I find that a lot of my use with PyQt is composing compound widget subclasses that combine other widgets in a particular arrangement and behaviour that I need. You can easily design the way they behave in terms of signals emitted, and you can capture mouse and keyboard events simply by overriding particular methods from the base QWidget class. Not sure if there are many pre-existing libraries of these (that I know). Perhaps because it's easy to do once you get the hang of it. For example, to make a combined label and line edit: class myTextField(QWidget): def __init__(self,label=My Text Field, parent=None): super(myTextField,self).__init__(parent) layout = QHBoxLayout() self.label = QLabel(label) layout.addWidget( self.label ) self.lineEdit = QLineEdit() layout.addWidget( self.lineEdit ) self.setLayout( layout ) You can get much more sophisticated than this, but just a quick example really. Hope this helps. Dan On 6 September 2010 02:13, Peter Milliken peter.milli...@gmail.comwrote: Prior to embarking on learning PyQt, I wrote my GUI applications using Tkinter and Pmw. The Pmw widget set is quite nice and provides a library of composite classes using the Tkinter widgets. My question is: Is there any (similar) composite widgets in PyQt? i.e. Pmw has the EntryField widget, which combines the (commonly used case) of a Label and a LineEdit into the one class - much more convenient than always having to specify the two entities separately, which seems to be the case with PyQt? The EntryField widget offers far more than just conveniently creating a Label and a LineEdit in the one class, it also allows definition of entry validation as well, so you can see that the composite classes provide quite a high level of functional behaviour to the user. Pmw defines other composite widgets like: RadioSelect - which groups radio buttons (well, you have the choice of defining it to handle radio buttons, check buttons or normal buttons). Of course in PyQt I have found the QGroupBox class, but this only performs a (small) part of what the Pmw RadioSelect widget does. Do such composite widgets exist? am I missing something in the PyQt documentation? Thanks Peter ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
Re: [PyQt] qsqltablemodel - ordering results
Hey Tom (hey - don't I work with you? ;-), Have you tried looking at making a QAbstractProxyModelhttp://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qabstractproxymodel.html subclass or even better a QSortFilterProxyModelhttp://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qsortfilterproxymodel.html class and putting it between your QSqlTableModel and your QTableView? You can override the MapFromSource and MapToSource methods and perhaps do your column swapping in there? Or maybe you could do it all in the sort filter model? Cheers Dan On 2 September 2010 17:08, Tom Proctor t...@dneg.com wrote: I would like to use a subclassed QSqlTableModel to fill a QTableView, but I'd like the order of the columns in the table to be different from the order of my fields in the database. I thought there must be some way to modify the query in .select() but I haven't gotten that to work. Using setQuery only seems to prevent queries from returning values. I also tried simply changing horizontalHeader().moveSection() on the table, but this is ugly as it needs to be reset each time I filter or select again. Any ideas? Thank you, Tom ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
Re: [PyQt] Threads, events, signals and slots...
Hi Peter,
When I have done this in my PyQt apps I simply send a signal straight from
the QThread to a function that updates the QProgressBar i.e:
inside QThread.run:
self.emit( SIGNAL('updateProgress(int,int)'), currentTask, numTasks )
then on your window class:
def updateProgressBar( self, currentTask, numTasks ):
self.progress_bar.setValue( int(float(currentTask)/numTasks * 100) )
Seems to work nicely without any Qt warnings.
Cheers
Dan
On 25 August 2010 01:51, Peter Milliken peter.milli...@gmail.com wrote:
Slowly working my way to learning this stuff but have a question regarding
how to update GUI elements when threads are running.
The situation is:
1. I have some radiobuttons that I use for input and output: input by the
user and then for output to display progress during an operation (the
operation is a task that runs in a QThread instance). The radiobuttons are
grouped into a QGroupBox are there are 3 of them to indicate 3 phases of a
total operation. The user selects a start phase and then instigates a
process (via a QCommandLinkButton), as the process progresses from the start
phase to the final phase the phase buttons must be updated.
2. I have a QProgressBar to indicate the progress (0 - 100%) within each
phase (indicated by the previously mentioned phase buttons). So each phase
progresses through 0 - 100% completion before advancing to the next phase.
So basically the user selects which phase they want to start at (0, 1 or 2)
and then press a button to instigate a QThread that performs the actions.
The progress is communicated back from the thread via messages in a pipe. To
receive the messages and update the GUI elements I start another QThread -
this is one of the methods of the application GUI class and goes into a
while loop, receiving messages from the thread that is doing the job and
directly making calls to GUI elements like:
self.phase_0.setChecked(True) and
self.progress_bar.setValue(X)
At the end of the while loop I do a time.sleep() command to allow the Qt
event loop to run and presumably update any GUI elements that need
updating. So the code looks like this (mix of pseudo code and real code
:-)):
while True:
if pipe.poll():
msg = pipe.rcv()
if msg is phase 0:
self.phase_0.setChecked(True)
elif msg = progress:
self.progress_bar.setValue(X)
elif msg = stop
break
time.sleep(0.05)
This seems to work quite well, however, every now and again, when switching
between Windows applications etc while the process that I have tasked is
running, I get an error/warning message:
QWidget::repaint: Recursive repaint detected
Should I be using signals/slots to update the GUI elements from within the
2nd task? If so, what would it look like (please use an example that would
see one of the phase radiobuttons updated).
Thanks for reading this and providing any help you can :-)
Peter
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