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Thread: How to select a row in QTreeView

  1. #1
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    Question How to select a row in QTreeView

    Hi,

    I have a QTreeView derived from QAbstractItemModel.
    I want to make the selection to the topmost node(root node) of the tree when the UI launches.

    Below is my code, but no selection happening.

    QModelIndex rootIndex = TreeView->rootIndex();
    QModelIndex rootChildIndex = TreeModel->index(0, 0, rootIndex);

    if (rootChildIndex.isValid())
    {
    TreeView->selectionModel()->select(rootChildIndex , QItemSelectionModel::Select);
    }

  2. #2
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    Default Re: How to select a row in QTreeView

    Add the QItemSelectionModel::Rows flag to the second argument if you want the whole row (all columns) selected.

    Cheers,
    _

  3. #3
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    Default Re: How to select a row in QTreeView

    Not working!

    TreeView->selectionModel()->select(rootChildIndex , QItemSelectionModel::Rows);

  4. #4
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    Default Re: How to select a row in QTreeView

    Hi, you need to add QItemSelectionModel::Select, otherwise nothing will be changed.
    Qt Code:
    1. TreeView->selectionModel()->select(rootChildIndex , QItemSelectionModel::Rows | QItemSelectionModel::Select);
    To copy to clipboard, switch view to plain text mode 

    Ginsengelf

  5. The following user says thank you to Ginsengelf for this useful post:

    chithara (4th June 2019)

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