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Thread: QTextEdit restore cursor position

  1. #1
    Join Date
    May 2008
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    Default QTextEdit restore cursor position

    Hi.

    I have problem with saving/restoring cursor position after closing/opening my application.
    I use textCursor().position() to save position in QSettings and textCursor().setPosition() to restore it, but cursor always is on on position 0. Saving work's ok, if I look in settings file position looks correct.

    How to fix this ?

    Code (rest of code is based on Qt MDI example) :
    Qt Code:
    1. void MdiChild::setMdiWindowProperites(_editor_properites opt)
    2. {
    3. mdiWindowProperites = opt;
    4. setReadOnly(mdiWindowProperites.readOnly);
    5. setFont(QFont(mdiWindowProperites.fontName, mdiWindowProperites.fontSize, QFont::Normal));
    6. //editorOpt.lastDir = opt.lastDir;
    7.  
    8.  
    9. if(mdiWindowProperites.syntaxH)
    10. {
    11. if(highlighter <= 0)
    12. highlighter = new Highlighter(document(), mdiWindowProperites.syntaxHColors);
    13. if(highlighter > 0)
    14. highlighter->rehighlight();
    15. }
    16. else
    17. {
    18. if(highlighter > 0)
    19. delete(highlighter);
    20. highlighter = 0;
    21. };
    22.  
    23. textCursor().setPosition(mdiWindowProperites.cursorPosX);
    24. ensureCursorVisible();
    25. }
    To copy to clipboard, switch view to plain text mode 

    I use QT4.4.0 on openSUSE 10.3 KDE3.

    Artur

    PS.
    Sorry for my bad English.
    Last edited by jpn; 25th May 2008 at 14:09. Reason: missing [code] tags

  2. #2
    Join Date
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    Default Re: QTextEdit restore cursor position

    QTextEdit::textCursor() returns a copy. Try to do it like this:
    Qt Code:
    1. QTextCursor cursor = textCursor();
    2. cursor.setPosition(mdiWindowProperites.cursorPosX);
    3. setCursor(cursor);
    To copy to clipboard, switch view to plain text mode 
    J-P Nurmi

  3. The following user says thank you to jpn for this useful post:

    artur231 (25th May 2008)

  4. #3
    Join Date
    May 2008
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    Qt products
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    Default Re: QTextEdit restore cursor position

    Thanks.
    Now works great.

    setCursor(cursor);
    Must be :
    setTextCursor(cursor);


    Artur

  5. #4
    Join Date
    Aug 2008
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    Qt products
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    Unix/X11 Windows

    Default Re: QTextEdit restore cursor position

    Does anyone knows why this solution works?

    Have this somewhere in your code..
    // save cursor
    int cur_position = win.textCursor().position();
    One cannot use xxx.setPosition(cur_position) this on the object (QTextEdit) itself, but if one copy it to a local variable, change the local variable, and then write it it back, i can confirm this does work, but don't know why.

    /** ---------------------------------------------------------------------------
    * @brief display_gui::restore_cursor
    * @param win Reference to a QTextEdit object
    * @param cur_position The last known curser position
    */
    void display_gui::restore_cursor (QTextEdit & win, int cur_position)
    {
    #ifdef DEBUG_CURSOR_RESTORE
    fprintf (stderr,"..... b.NewPos %6d",win.textCursor().position());
    #endif

    //win.textCursor().setPosition(cur_position, QTextCursor::KeepAnchor); //QTextCursor::MoveAnchor);
    //win.textCursor().movePosition(QTextCursor::End, QTextCursor::KeepAnchor); //QTextCursor::MoveAnchor);
    // after many many hours .. this seem to be working !!!
    // for some UNKNOWN REASON you cannot do this to the original, but you can copy it, change
    // what you want , and write it back, then it works
    QTextCursor my_cur = win.textCursor();

    my_cur.setPosition(cur_position);
    win.setTextCursor(my_cur);

    #ifdef DEBUG_CURSOR_RESTORE
    fprintf (stderr,"..... b.Restore %6d", cur_position);
    #endif
    }
    What is also strange is that I tried to save the cursor in a QTextCursor variable, and restoring it, it does change the cursor position, but then one loose properties like underline and textcolor ??.

    Thanks

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