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Thread: QTableWidget move row?

  1. #1
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    Question QTableWidget move row?

    Hi,

    i have a QTablewidget with "SingleSelection". How can i move the rows up and down?

    Thanks in advance,

    Whitefurrows

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    Default Re: QTableWidget move row?

    There isn't any single API method for doing that. Use QTableWidget::takeItem() to temporarily remove both "source" and "destination" items from the table without deleting them, and then use QTableWidget::setItem() to set them back in a reverse order.
    J-P Nurmi

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

    whitefurrows (23rd August 2006)

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    Question Re: QTableWidget move row?

    Hi,

    the problem is i have many items in a row. I try this to remove the row.

    Qt Code:
    1. QModelIndexList idxList = tableWidget->selectionModel()->selectedIndexes();
    2.  
    3. QListIterator<QModelIndex> idxIt(indexList);
    4. idxIt.toBack();
    5.  
    6. while(idxIt.hasPrevious()){
    7. QModelIndex idx = idxIt.previous();
    8. if(index.column() == 0){
    9. tableWidget->removeRow(idx.row());
    10. }
    11. }
    To copy to clipboard, switch view to plain text mode 

    but im not sure how can i paste it to move up and down. Can you help me please?

    Thanks in advance,

    Whitefurrows

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    Default Re: QTableWidget move row?

    Qt Code:
    1. void TableWidget::move(bool up)
    2. {
    3. Q_ASSERT(selectedItems().count() > 0);
    4. const int sourceRow = row(selectedItems().at(0));
    5. const int destRow = (up ? sourceRow-1 : sourceRow+1);
    6. Q_ASSERT(destRow >= 0 && destRow < rowCount());
    7.  
    8. // take whole rows
    9. QList<QTableWidgetItem*> sourceItems = takeRow(sourceRow);
    10. QList<QTableWidgetItem*> destItems = takeRow(destRow);
    11.  
    12. // set back in reverse order
    13. setRow(sourceRow, destItems);
    14. setRow(destRow, sourceItems);
    15. }
    16.  
    17. // takes and returns the whole row
    18. QList<QTableWidgetItem*> TableWidget::takeRow(int row)
    19. {
    20. QList<QTableWidgetItem*> rowItems;
    21. for (int col = 0; col < columnCount(); ++col)
    22. {
    23. rowItems << takeItem(row, col);
    24. }
    25. return rowItems;
    26. }
    27.  
    28. // sets the whole row
    29. void TableWidget::setRow(int row, const QList<QTableWidgetItem*>& rowItems)
    30. {
    31. for (int col = 0; col < columnCount(); ++col)
    32. {
    33. setItem(row, col, rowItems.at(col));
    34. }
    35. }
    To copy to clipboard, switch view to plain text mode 
    J-P Nurmi

  6. The following 2 users say thank you to jpn for this useful post:

    vycke (28th April 2008), whitefurrows (23rd August 2006)

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    Thumbs up Re: QTableWidget move row?

    Hi,

    thank you for that great example, that's work fine.

    Greetings,

    Whitefurrows

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    Question Re: QTableWidget move row?

    I have the same problem, but what i need to swap are the cell widgets, and getting the items don't work, the items get changed, but the cell widgets keep the same.

    Is there any way of doing this?

    Qt Code:
    1. QTableWidgetItem *item1 = colorizerTable->takeItem(row1, 0);
    2. QTableWidgetItem *item2 = colorizerTable->takeItem(row2, 0);
    3. colorizerTable->setItem(row1, 0, item2);
    4. colorizerTable->setItem(row2, 0, item1);
    To copy to clipboard, switch view to plain text mode 

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    Default Re: QTableWidget move row?

    Apparently QTableWidget::setCellWidget() maps the widget to the specific cell, not to the specific item. So you will have swap the cell widget by hand, too.
    J-P Nurmi

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

    deasterbrook (5th January 2007)

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    Default Re: QTableWidget move row?

    The problem is that, when i set a widget for a specific cell, it deletes the previous one, so I cannot

    The only way I've found is to have a Clone function in the widget's class

  12. #9
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    Default it is only can moveup or movedown.cant move two or more rows.

    Quote Originally Posted by jpn View Post
    Qt Code:
    1. void TableWidget::move(bool up)
    2. {
    3. Q_ASSERT(selectedItems().count() > 0);
    4. const int sourceRow = row(selectedItems().at(0));
    5. const int destRow = (up ? sourceRow-1 : sourceRow+1);
    6. Q_ASSERT(destRow >= 0 && destRow < rowCount());
    7.  
    8. // take whole rows
    9. QList<QTableWidgetItem*> sourceItems = takeRow(sourceRow);
    10. QList<QTableWidgetItem*> destItems = takeRow(destRow);
    11.  
    12. // set back in reverse order
    13. setRow(sourceRow, destItems);
    14. setRow(destRow, sourceItems);
    15. }
    16.  
    17. // takes and returns the whole row
    18. QList<QTableWidgetItem*> TableWidget::takeRow(int row)
    19. {
    20. QList<QTableWidgetItem*> rowItems;
    21. for (int col = 0; col < columnCount(); ++col)
    22. {
    23. rowItems << takeItem(row, col);
    24. }
    25. return rowItems;
    26. }
    27.  
    28. // sets the whole row
    29. void TableWidget::setRow(int row, const QList<QTableWidgetItem*>& rowItems)
    30. {
    31. for (int col = 0; col < columnCount(); ++col)
    32. {
    33. setItem(row, col, rowItems.at(col));
    34. }
    35. }
    To copy to clipboard, switch view to plain text mode 
    it is only can moveup or movedown.cant move tow or more rows.actually,it is called swap two rows seemed more reasonable.

  13. #10
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    Default Re: QTableWidget move row?

    You can move row using method "moveSection" in table->verticalHeader()

  14. #11
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    Default Re: QTableWidget move row?

    Hi,
    "moveSection" will move the section of the header and its contents (<- the row including QWidgets set with "setCellWidget"). But what if i want to move only the contents of the row without changing the header? More specifically, what should i do if want to swap two cells containing each of them a QWidget?

    jpn

    Re: QTableWidget move row?
    Apparently QTableWidget::setCellWidget() maps the widget to the specific cell, not to the specific item. So you will have swap the cell widget by hand, too.
    How can i swap the cell widget by hand?
    Thanx in advance

  15. #12
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    Default Re: QTableWidget move row?

    Till now, i've manage to swap two cells with QWidgets but with a very ugly trick!
    First, i get the pointers of the two QWidgets by calling "cellWidget" (let's say wid1 and wid2). Then, i call "editorDestroyed(wid1)" and "editorDestroyed(wid2)". This protected slot releases QWidget's pointer from the internal map but does NOT delete the widget! Finally, i call setCellWidget to set the QWidgets where i want to.

    I know that this method is not cute, but it's the only i've got till now

  16. #13
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    Default Re: QTableWidget move row?

    Damn !
    the function 'editorDestroyed' is protected and not accessible

  17. #14
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    Default Re: QTableWidget move row?

    the function 'editorDestroyed' is protected and not accessible
    Then all you have to do is derive your own table widget class from QTableWidget and you have access to all of the protected methods of QTableWidget and its base classes. This is basic C++.
    <=== The Great Pumpkin says ===>
    Please use CODE tags when posting source code so it is more readable. Click "Go Advanced" and then the "#" icon to insert the tags. Paste your code between them.

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