How to set QTableWidget upper left corner using a background image？

Question

How to set QTableWidget upper left corner using a background image? Now it is white. (Pointed in the image below)

Answer 1

For me, using PyQt4.13 on Windows, setting a background-color on the QTableWidget QTableCornerButton element in the Qt stylesheet has an effect but setting background-image has not. However, you can make the background-color transparent (rgba(0,0,0,0)) and then you see the background image of the widget shining through. The border should be set again to make it look nice.

Code:

from PyQt4 import QtGui

app = QtGui.QApplication([])

# app.setStyleSheet('QWidget { background-color: #aa8888; } QHeaderView::section { background-color: #88aa88; } QTableWidget QTableCornerButton::section {background-color: #8888aa; }')
# app.setStyleSheet('QWidget { background-image: url(bg.png); } QHeaderView::section { background-image: url(bg.png); } QTableWidget QTableCornerButton::section {background-image: url(bg.png); }')
app.setStyleSheet('QWidget { background-image: url(bg.png); } QHeaderView::section { background-color: rgba(0,0,0,0); } QTableWidget QTableCornerButton::section {background-color: rgba(0,0,0,0); }')

w = QtGui.QTableWidget(2, 2)
w.show()

app.exec_()

Results in (depending on which stylesheet line you use):

Left image: set widget, headerview and tablecornerbutton background color works

Center image: set widget background image, try to set headerview and tablecornerbutton background image but without effect

Right image: set widget background image, set headerview and tablecornerbutton background color to transparent. Borders have to be set again probably.

Answer 2

You will have to use a custom row-headers column:

• disable the builtin row headers column,
• add a column to hold row numbers,
• define slots to update row ID when rows are added/removed and to select row, change its font etc,
• and finally set the widget to be used in column=0 column header.