<![CDATA[Does it have to call QTableWidget::setItem for every cell?]]>Not quite clear about the usage about QTableWidget. (not in view/model mode)
After setColumnCount and setColumnCount, run the program, what confuse me is:

  1. The table widget works (click to edit, saved to UI after editing), but QTableWidget::item returns null for a existing cell, so the properties of the cell can't be modified
  2. Does it have to call QTableWidget::setItem for every cell?
]]>https://forum.qt.io/topic/80159/does-it-have-to-call-qtablewidget-setitem-for-every-cellRSS for NodeTue, 22 Sep 2026 18:27:31 GMTSat, 10 Jun 2017 07:13:19 GMT60<![CDATA[Reply to Does it have to call QTableWidget::setItem for every cell? on Sat, 10 Jun 2017 08:44:25 GMT]]>Remember that we're not talking about abstract things. Items take memory. If you have an empty 10000x10000 table that just holds the width and the height - it costs almost nothing, but fill it up with items and you've got yourself a real memory hog.
Only insert the items you actually need.

]]>https://forum.qt.io/post/398628https://forum.qt.io/post/398628Sat, 10 Jun 2017 08:44:25 GMT<![CDATA[Reply to Does it have to call QTableWidget::setItem for every cell? on Sat, 10 Jun 2017 07:24:07 GMT]]>Hi
setRowCount();
setColumnCount();

That only sets how many to expect. You must insert as many items as you specify.

https://wiki.qt.io/How_to_Use_QTableWidget

]]>https://forum.qt.io/post/398623https://forum.qt.io/post/398623Sat, 10 Jun 2017 07:24:07 GMT