How to replace a Widget with another using Qt?

问题

I have an QHBoxLayout with a QTreeWidget on the left, a separator on the middle and a widget on the right.

When I click on the QTreeWidget, I want to change the widget on the right to modify the QTreeWidgetItem

I tried to do this with this code :

def new_rendez_vous(self):
    self.ui.horizontalLayout_4.removeWidget(self.ui.editionFormWidget)
    del self.ui.editionFormWidget
    self.ui.editionFormWidget = RendezVousManagerDialog(self.parent)
    self.ui.editionFormWidget.show()
    self.ui.horizontalLayout_4.addWidget(self.ui.editionFormWidget)
    self.connect(self.ui.editionFormWidget, QtCore.SIGNAL('saved'), self.scheduleTreeWidget.updateData)

def edit(self, category, rendez_vous):
    self.ui.horizontalLayout_4.removeWidget(self.ui.editionFormWidget)
    del self.ui.editionFormWidget
    self.ui.editionFormWidget = RendezVousManagerDialog(self.parent, category, rendez_vous)
    self.ui.editionFormWidget.show()
    self.ui.horizontalLayout_4.addWidget(self.ui.editionFormWidget)
    self.connect(self.ui.editionFormWidget, QtCore.SIGNAL('saved'), self.scheduleTreeWidget.updateData)

def edit_category(self, category):
    self.ui.horizontalLayout_4.removeWidget(self.ui.editionFormWidget)
    del self.ui.editionFormWidget
    self.ui.editionFormWidget = CategoryManagerDialog(self.parent, category)
    self.ui.editionFormWidget.show()
    self.ui.horizontalLayout_4.addWidget(self.ui.editionFormWidget)
    self.connect(self.ui.editionFormWidget, QtCore.SIGNAL('saved'), self.scheduleTreeWidget.updateData)

But it doesn't work and all the widgets are stacked up on each other :

_{(source: free.fr)}
.

Do you know how I can remove the old widget and next display the new one ?

回答1:

The most common solution is to use QStackedWidget and put all possible widgets into the stack. When selecting an item, just call setCurrentWidget to display the one you want.

回答2:

I have the same question as Natim.

The QStackedWidget is a solution for a preset layout. It acts like the flippy thing in an old diner for a music box. (X-amount of albums in the jukebox, flip through the installed albums).

However this does not solve the question.

For instance I have code I am prototyping with a UI layout, however I want to replace some of the widgets that are acting as place-holders with the proper widgets that are coded during the primary script execution, or is dynamically created.

I am sure there is a simple procedure or caveat as to how to properly remove/replace a widget.

The code I have has a basic textEdit widget in a grid layout. I want to code a custom version of this widget for drag and drops and then swap it out with the default textEdit.

Like Natim, the code seems logically sound, however the widgets are hap-hazardly piled in the layout like dumping a purse.

Hopefully can figure out the trick to this and repost the caveat.

SOLUTION:

Voilà!! Found something that definitely does the trick. CLOSE your widget

#  Remove, Create, Replace
    self.ui.gridLayout.removeWidget(self.ui.dragDataEdit)
    self.ui.dragDataEdit.close()
    self.ui.dragDataEdit = myDumpBox(self.ui.centralwidget)
    self.ui.gridLayout.addWidget(self.ui.dragDataEdit, 0, 0, 1, 1)
    self.ui.gridLayout.update()

I removed the widget from the layout, then closed the widget. At this time the variable I am using is open to create my custom/modified widget, and then re-insert it into the layout

Yes some more elegance is needed to deal with more complicated layouts, but the basic need of destroying a widget in order to replace it is in the .close() method

Cheers.. hope this helps. B

回答3:

Actually, as for Qt5 at least, there is a more compact alternative to B4adle7's solution utilizing QLayout's replaceWidget:

containing_layout = placeholder.parent().layout()
containing_layout.replaceWidget(placeholder, new_widget)

来源：https://stackoverflow.com/questions/4625102/how-to-replace-a-widget-with-another-using-qt

标签

python

pyqt