[PyQt] Resize columns in QTreeViewv

Tue Nov 23 14:04:34 GMT 2010

Sorry for the redirection but I've had some problem with my mail 
clients, and I had disabled the list mails for a while...

Ooooopssss!!! the first parameter is the milliseconds!! I thought it was 
the seconds!! Now it is working correctly! ( I know I should have looked 
the docs...)
I'll attach the file browser class to this mail. The problem is at row 
34, the setFilter method. I want to display only regular files in left 
widget, but the filter displays all
the files and directory even the hidden ones!
If you comment out that line everything is working but you get files and 
folders in the left widget!
Thanks

Gionata Boccalini

Il 23/11/2010 14:46, Hans-Peter Jansen ha scritto:
> [Rebounce to list, no need to address me directly..]
>
> On Tuesday 23 November 2010, 14:11:17 Gionata Boccalini wrote:
>> Ok, I now I have
>>
>> QTimer.singleShot(4, self.resizeColumn)
>>
>> in the slot, where self.resizeColumn is a callable:
>>
>>    def resizeColumn(self):
>>           self.treeView.resizeColumnToContents(0)
>>           self.fileView.resizeColumnToContents(0)
>>
>> Is there some way to call directly the resizeColumnToContents from
>> the Qtimer without using a slot???
> You can use lambdas, but what's your problem with slots?
>
>> But this solution is working only sometimes, and if I set the wait to
>> be less than 4 seconds it works even worst... any idea??
> In fact, these are 4 milliseconds. Please explain "even worst".
>
>> And I also have another problem, that is not related to the resize
>> column I think: when I set the filter on the model to show only files
>> with
>>
>>    self.fileModel.setFilter(QDir.Files)
>>
>> the result is a list of files, dirs, even hidden files, without any
>> ordering...
>> Please be patient with me ;) I am still a beginner.... thanks!!
> This gives you even more reasons to provide a minimum runnable example
> demonstrating your issues.
>
> Note this this practice is the single most successful procedure to solve
> complex [PyQt] problems, even for advanced practitioners.
> Hence, in doing so, you are in good company.
>
> Pete
>
>> Gionata Boccalini
>>
>> On Monday 22 November 2010, 20:56:35 Gionata Boccalini wrote:
>>> /  Hi, I am doing a  small file browser with 2 QTreeView (treeView
>>> and
>> />/  fileView) linked with 2 different QFileSystemModel (dirModel and
>> />/  fileModel): when the user selects a folder on the left view I
>> want />/  the contents of that folder to be displayed in the right
>> view, (only />/  the files are shown in the right view while only
>> folder are shown in />/  the left view...).
>> />/  This is the constructor method, in short:
>> />/
>> />/  class FileBrowser(QWidget):
>> />/       def __init__(self, parent = None):
>> />/           super(FileBrowser, self).__init__(parent)
>> />/           self.treeView = QtGui.QTreeView()
>> />/           self.treeView.setSortingEnabled (True)
>> />/           self.dirModel = QtGui.QFileSystemModel()
>> />/           self.dirModel.setFilter(QDir.AllDirs |
>> QDir.NoDotAndDotDot) />/
>> self.treeView.setModel(self.dirModel)
>> />/
>> />/           # Path
>> />/           rootindex = self.dirModel.setRootPath(QDir.rootPath())
>> />/           homeindex = self.dirModel.index(QDir.homePath())
>> />/
>> />/           self.treeView.setRootIndex(rootindex)
>> />/           self.treeView.scrollTo(homeindex,
>> />/  QtGui.QAbstractItemView.PositionAtTop)
>> />/           self.treeView.expand(homeindex)
>> />/           self.treeView.resizeColumnToContents(0)
>> />/           self.treeView.sortByColumn(0, Qt.AscendingOrder)
>> />/
>> />/           sizePolicy = QSizePolicy(QSizePolicy.Expanding,
>> />/  QSizePolicy.Expanding)
>> />/           self.treeView.setSizePolicy(sizePolicy)
>> />/           self.treeView.setAlternatingRowColors(True)
>> />/           self.treeView.setAnimated(True)
>> />/           self.treeView.hideColumn(1)
>> />/           self.treeView.hideColumn(2)
>> />/
>> />/           ....
>> />/           self.fileModel = QtGui.QFileSystemModel()
>> />/           #self.fileModel.setFilter(QDir.Files)
>> />/           self.fileView = QtGui.QTreeView()
>> />/           self.fileView.setModel(self.fileModel)
>> />/           self.fileModel.setRootPath(QDir.rootPath())
>> />/           homeindex = self.fileModel.index(QDir.homePath())
>> />/
>> />/           .......
>> />/           ....
>> />/
>> />/           self.fileView.setRootIndex(homeindex)
>> />/           self.fileView.setSizePolicy(sizePolicy)
>> />/           self.fileView.setSortingEnabled (True)
>> />/           self.fileView.sortByColumn(2, Qt.AscendingOrder)
>> />/           self.fileView.setAlternatingRowColors(True)
>> />/           self.fileView.setAnimated(True)
>> />/
>> />/           # Signals
>> />/           self.treeView.clicked.connect(self.updateFiles)
>> />/           ...
>> />/           ...
>> />/
>> />/
>> />/
>> />/  The problem is the resizeColumnToContents(0) method of
>> QtreeView, />/  which is called in a slot on the "clicked" QTreeView
>> signal: when I />/  click on the folder in the left view the first
>> column is resized, but />/  the first column of the right view is
>> resized only on the second />/  click on the same folder (on the left
>> view.... quite tricky to />/  explain....)!!! This is the code I am
>> using in the slot for the />/  clicked() signal:
>> />/
>> />/    @QtCore.pyqtSlot('QModelIndex')
>> />/       def updateFiles(self,  index):
>> />/           path = self.dirModel.filePath(index)
>> />/           fileIndex = self.fileModel.index(path)
>> />/           self.fileView.setRootIndex(fileIndex)
>> />/
>> />/           self.treeView.resizeColumnToContents(0)
>> />/           self.fileView.resizeColumnToContents(0)
>> />/
>> />/
>> />/  The first column shrinks only on the second click, so on the
>> second />/  signal...
>> />/  If I comment out the line  self.fileView.setRootIndex(fileIndex)
>> the />/  resize goes as it should, but the treeView is not updated
>> with the />/  new files..
>> />/  Maybe there is a better way to do it all, but I haven't found a
>> good />/  example on the net, so I am trying to do that myself.
>> Anyway I hope />/  I've explained it well...
>> /
>>
>>> I remember having similar issues, that I was able to workaround with
>>> delaying the calls to resizeColumnToContents with
>>> QTimer.singleShot(0, ...)
>>>
>>> Might be worth a try..
>>>
>>> Pete
>
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