Working Log – Zaiko Kanri

• Modifying from recognizing “Enter” key (‘\r’) is not as simple as thought
  2025.04.15 (Tue), 2025.04.15 (Wed)
  • The currently used approach for recognizing the “Enter” key
    • overriding eventFilter
      eventFilter(elf, object, event):
      • event.type() == QEvent.KeyPress
      • event.text() == u’\r’
    • apparently there’s an “installEventFilter() to enable this eventFilter() ?
      • e.g.
        self.tblZaikoKanrihyou.installEventFilter(self)
        self.txtSuuryou.installEventFilter(self)
    • PROBLEM:
      • TAB key is not captured/included in KeyPress event !!!
      • solution in the internet that includes example that uses event.key()
      • this event.key() is not existed in PySide, only in PyQt
  • Search attempt: Key_Tab
    • event.key() is only in PyQt, not available in PySide (will results error)
      https://qiita.com/Tadataka_Takahashi/items/483c85a2190ea080289a
  • Related Documentation
    • PySide 1.0.7 QEvent https://srinikom.github.io/pyside-docs/PySide/QtCore/QEvent.html
      • there is function type(), but not key()
    • PySide2 QEvent https://doc.qt.io/qtforpython-5/PySide2/QtCore/QEvent.html
      • basically same with PySide 1,
        looking at the synopsis, there’s type() function, but not key()
      • compatible with Python 2.7 too
      • there’s key() in QKeyEvent, but no example.. so.. maybe not the one we’re looking for
        https://doc.qt.io/qtforpython-5/PySide2/QtGui/QKeyEvent.html
      • example event.key() in PySide2
        https://code.tiblab.net/python/pyside/event_key
        using keyPressEvent –> good enough as reference
        but not sure if TAB key is captured here
      • there’s Qt.Key_Tab in PySide2
        https://doc.qt.io/qtforpython-5/PySide2/QtCore/Qt.html#more
        but not sure how to catch it in an event
      • rethinking, reconsidering… the sample code here
        https://stackoverflow.com/questions/54174878/only-key-tab-shiftmodifier-doest-work-well-with-pyside
        using keyPressEvent in PySide
        with later:
        if event.key() == QtCore.Qt.Key_Tab:
      • SEEMS PROSPECTIVE
        search keyword: qtablewidget keypress event python
        https://stackoverflow.com/questions/60954886/how-can-i-set-custom-key-board-key-press-event-in-qtablewidget-python
  • Failed attempt
    • Approach 1
      eventFilter(self, object, event)
      • if object == self.tblDeetabeesu
        • if event.type() == QEvent.FocusOut
    • Why it failed during execution
      • works quite normal & as expected UNTIL isnumeric() detection
        self.tblDeetabeesu.item(dbRow, previousColumn).text().isnumeric()
      • then it should be coming back to
        self.tblDeetabeesu.edit(self.tblDeetabeesu.currentIndex())
      • but it doesn’t
      • the editing mode is suddenly off
    • LET’S TRY OTHER APPROACH
    • Approach 2
      tblDeetabeesu_cellChanged(self)
    • Why it failed during execution
      • works well enough
      • failed when user keep giving the same input, e.g.,
        1st trial: ‘a’
        2nd trial: ‘a’
      • the cellChanged doesn’t recognize it as change (which is true)
    • LET’S TRY OTHER APPROACH
    • Approach 3
      tblDeetabeesu_itemSelectionChanged(self)
    • Problem:
      • at the last cell
      • when tab clicked, it moves to other cell, then start to process everything
    • CURRENT CONCLUSION
      • ENTER : eventFilter
        • current cell is still in the edited cell (?)
        • the first dbCol = 0
      • TAB : cellChanged
        • happens when the cell is already moved to the next cell
        • the first dbCol = 0
      • TAB : itemSelectionChanged
        • happens when the cell is already moved
        • the first column = 1!!!
  • Can’t print header table UTF+8 (unreadable) to console/python console
    • https://stackoverflow.com/questions/38651993/print-utf-8-character-in-python-2-7
    • https://www.joelonsoftware.com/2003/10/08/the-absolute-minimum-every-software-developer-absolutely-positively-must-know-about-unicode-and-character-sets-no-excuses/