In reference to this answer on adding a new tab button to QTabWidget, I am unsure where the QPushButton is added to the QTabBar. I assume the setParent method on the pushButton adds it to the tab bar. But when I try to implement it, the pushButton doesnt seem to appear anywhere on the tab bar even if I add hard values to the move operation.
Here is a minimum reproducible example,
from PyQt5 import QtGui, QtCore, QtWidgets
class TabBarPlus(QtWidgets.QTabBar):
"""Tab bar that has a plus button floating to the right of the tabs."""
plusClicked = QtCore.pyqtSignal()
def __init__(self):
super().__init__()
# Plus Button
self.plusButton = QtWidgets.QPushButton("+")
self.plusButton.setParent(self)
self.plusButton.setFixedSize(20, 20) # Small Fixed size
self.plusButton.clicked.connect(self.plusClicked.emit)
self.movePlusButton() # Move to the correct location
# end Constructor
def sizeHint(self):
"""Return the size of the TabBar with increased width for the plus button."""
sizeHint = QtWidgets.QTabBar.sizeHint(self)
width = sizeHint.width()
height = sizeHint.height()
return QtCore.QSize(width+25, height)
# end tabSizeHint
def resizeEvent(self, event):
"""Resize the widget and make sure the plus button is in the correct location."""
super().resizeEvent(event)
self.movePlusButton()
# end resizeEvent
def tabLayoutChange(self):
"""This virtual handler is called whenever the tab layout changes.
If anything changes make sure the plus button is in the correct location.
"""
super().tabLayoutChange()
self.movePlusButton()
# end tabLayoutChange
def movePlusButton(self):
"""Move the plus button to the correct location."""
# Find the width of all of the tabs
size = sum([self.tabRect(i).width() for i in range(self.count())])
# size = 0
# for i in range(self.count()):
# size += self.tabRect(i).width()
# Set the plus button location in a visible area
h = self.geometry().top()
w = self.width()
if size > w: # Show just to the left of the scroll buttons
self.plusButton.move(w-54, h)
else:
self.plusButton.move(size, h)
# end movePlusButton
# end class MyClass
class CustomTabWidget(QtWidgets.QTabWidget):
"""Tab Widget that that can have new tabs easily added to it."""
def __init__(self, parent=None):
super().__init__(parent)
# Tab Bar
self.tab = TabBarPlus()
self.setTabBar(self.tab)
# Properties
self.setMovable(True)
self.setTabsClosable(True)
# Signals
self.tab.plusClicked.connect(self.addTab)
# self.tab.tabMoved.connect(self.moveTab)
# self.tabCloseRequested.connect(self.removeTab)
# end Constructor
# end class CustomTabWidget
class AppDemo(QtWidgets.QMainWindow):
def __init__(self):
super(AppDemo, self).__init__()
self.centralwidget = QtWidgets.QWidget(self)
self.horizontalLayout = QtWidgets.QHBoxLayout(self.centralwidget)
self.horizontalLayout.setContentsMargins(0, -1, 0, -1)
self.playlist_manager = CustomTabWidget(self.centralwidget)
self.horizontalLayout.addWidget(self.playlist_manager)
blankWidget = QtWidgets.QWidget(self.playlist_manager)
self.playlist_manager.addTab(blankWidget, "New")
self.setCentralWidget(self.centralwidget)
self.show()
# end class AppDemo
def main():
import sys
app = QtWidgets.QApplication(sys.argv)
w = AppDemo()
w.setWindowTitle('AppDemo')
w.show()
sys.exit(app.exec_())
if __name__ == '__main__':
main()
Expected behvaiour is that a "+" button appears at the right of all the tabs, but no such button appears.
