QWidget.setFocus() does not work

nst0022

I have a treeview and a textedit widget:

self.treeview1 = QTreeView()
self.textedit1 = MyTextEdit()

where MyTextEdit has only two overridden methods:

class MyTextEdit(QTreeView):
  def focusInEvent(self, event): 
    ...
  def focusOutEvent(self, event):
    ...

Both widgets reside in a splitter:

  self.splitview1 = QSplitter()

  self.splitview1.addWidget(self.treeview1)
  self.splitview1.addWidget(self.textedit1)

So far, so good.

When I have finished editing the text in QTextEdit, I press a toolbar butten, where I process the modified text and then want to move the focus from QTextEdit to QTreeView:

self.treeview1.setFocus(Qt.OtherFocusReason)

Nothing happens, no error is indicated, the focus remains in QTextEdit.

I tried all other focus reasons as well, to no avail.

I know that setFocus() is a slot and I have not yet fully understood the slot concept.

So, should this work at all?

jsulm

@nst0022 said in QWidget.setFocus() does not work:

class MyTreeView(QTreeView)

I'm confused: don't you mean MyTextEdit here?
Are you sure self.treeview1.setFocus(Qt.OtherFocusReason) is called (you do not show relevant code)?

nst0022

@jsulm Yes, sorry, I have updated the original post.

Yes, the code is executed, I had added a print() statement, and I also tried instead sending a keypress event (Shift-Tab) to treeview1:

keypress = QKeyEvent(QKeyEvent.KeyPress,          
                     Qt.Key_Tab,                  
                     Qt.ShiftModifier)            
                                                   
QGuiApplication.sendEvent(self.treeview1, keypress)

Same result, focus remained in QTextEdit.

nst0022

I guess that @jsulm had answered my questen, whether it should work at all, with a Yes.

So, I have created a minimum python script:

2021-06-29_10.45.58.png

where setFocus() does indeed work.

So, somewhere in my 1900 lines Python script I mess something up, which I have to find now.

JonB

@nst0022 said in QWidget.setFocus() does not work:

So, somewhere in my 1900 lines Python script I mess something up, which I have to find now.

Can you use an eventFilter somewhere to detect a focus change event, to help you track it down?

nst0022

Got it.

In my specific logic, I had set

self.treeview1.setEnabled(False)

but not the corresponding

self.treeview1.setEnabled(True)

At the time I tried to set the focus, the widget was simply disabled.

Now it works.

Detecting this error was hampered by a style sheet I used, that had no entry for QTreeView:!active, so, enabled or not, it always looked the same.