Widget on corner QTabBar is not in corner

Question

I have a pushbutton to add a tab in a QTabWidget. But when I change the button's size, it's not in the corner anymore. So how can I bring it to the corner like in the first picture?

Not change size:

Change size:

Here is my code:

from PyQt4 import QtGui, QtCore


class PlaylistTable(QtGui.QWidget):
    def __init__(self):
        super(PlaylistTable, self).__init__()
        self.playlistTable = QtGui.QTableWidget(self)
        self.playlistTable.setFrameShape(QtGui.QFrame.NoFrame)
        self.playlistTable.setFrameShadow(QtGui.QFrame.Sunken)
        self.playlistTable.setLineWidth(0)
        self.playlistTable.setEditTriggers(QtGui.QAbstractItemView.NoEditTriggers)
        self.playlistTable.setVerticalScrollMode(QtGui.QAbstractItemView.ScrollPerPixel)
        self.playlistTable.setHorizontalScrollMode(QtGui.QAbstractItemView.ScrollPerPixel)
        self.playlistTable.setShowGrid(True)
        self.playlistTable.setGridStyle(QtCore.Qt.SolidLine)
        self.playlistTable.setWordWrap(True)
        self.playlistTable.setCornerButtonEnabled(True)
        self.playlistTable.verticalHeader().setVisible(False)


class CustomTabWidget(QtGui.QTabWidget):
    """Tab Widget that that can have new tabs easily added to it."""

    def __init__(self, parent=None):
        super(CustomTabWidget, self).__init__(parent)
        # QtGui.QTabWidget.__init__(self, parent)

        # Tab Bar
        self.tab = QtGui.QTabBar()
        self.setTabBar(self.tab)

        # Properties
        self.setMovable(True)
        self.setTabsClosable(True)

        self.plusButton = QtGui.QPushButton("+")
        self.plusButton.setFixedSize(QtCore.QSize(22, 22))
        self.setCornerWidget(self.plusButton)

        # Signals
        self.connect(self.plusButton, QtCore.SIGNAL('clicked()'), self.addTab)
        # self.tab.plusClicked.connect(self.addTab)
        self.tab.tabMoved.connect(self.tab.moveTab)
        self.tabCloseRequested.connect(self.removeTab)

    def addTab(self):
        string = QtCore.QString.fromUtf8("Playlist")
        tab = PlaylistTable()
        super(CustomTabWidget, self).addTab(tab, string)


class AppDemo(QtGui.QMainWindow):
    def __init__(self):
        super(AppDemo, self).__init__()
        self.centralwidget = QtGui.QWidget(self)
        self.horizontalLayout = QtGui.QHBoxLayout(self.centralwidget)
        self.horizontalLayout.setContentsMargins(0, -1, 0, -1)

        self.playlist_manager = CustomTabWidget(self.centralwidget)

        self.horizontalLayout.addWidget(self.playlist_manager)

        self.playlist_manager.addTab()
        self.setCentralWidget(self.centralwidget)

        self.show()
# end class AppDemo


def main():
    import sys
    app = QtGui.QApplication(sys.argv)

    w = AppDemo()
    w.setWindowTitle('AppDemo')
    w.show()

    sys.exit(app.exec_())

if __name__ == '__main__':
    main()

score 2 · Accepted Answer · answered Nov 13 '15 at 20:13

I'm guessing the reason is this, from QTabWidget Documentation:

The geometry of the widget is determined based on the widget's sizeHint() and the style().

If you print the sizeHint() of the QPushButton you will see that width never goes below a certain value.

I've found an alternative is to use a QToolButton which can do everything (even more) a QPushButton does.

self.plusButton = QtGui.QToolButton(self)
self.plusButton.setText("+")

Widget on corner QTabBar is not in corner

1 Answers1