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POQt: adapting signals / binding arguments to slots?
 

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  1. POQt: adapting signals / binding arguments to slots?
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    <p>Is there any way to bind arguments to slots ala <a href="http://www.boost.org/doc/libs/1_38_0/libs/bind/bind.html" rel="nofollow noreferrer" title="boost::bind">boost::bind</a>?</p> <p>Here's a for-instance. I have a window with a tree view, and I want to allow the user to hide a column from a context menu. I end up doing something like:</p> <pre><code>void MyWindow::contextMenuEvent (QContextMenuEvent* event) { m_column = view-&gt;columnAt (event-&gt;x()); QMenu menu; menu.addAction (tr ("Hide Column"), this, SLOT (hideColumn ())); // .. run the menu, etc } </code></pre> <p>I need to capture the index of the column over which the context menu was activated and store it in a member variable that is used by my window's <code>hideColumn</code> slot:</p> <pre><code>void MyWindow::hideColumn () { view-&gt;setColumnHidden (m_column, true); } </code></pre> <p>What I'd really like is to be able to bind the column number to my slot when I create the menu so I don't need this member variable. Basically the Qt equivalent of:</p> <pre><code>menu.addAction (tr ("Hide Column"), boost::bind (&amp;MyWindow::hideColumn, this, event-&gt;columnAt (event-&gt;x())); </code></pre> <p>Or even better yet adapting the <a href="http://doc.trolltech.com/4.3/qaction.html#triggered" rel="nofollow noreferrer">QAction::triggered</a> signal and attaching it to the <a href="http://doc.trolltech.com/4.3/qtreeview.html#hideColumn" rel="nofollow noreferrer">QTreeView::hideColumn</a> slot, which takes the column index as an argument:</p> <pre><code>menu.addAction (tr ("Hide Column"), boost::bind (&amp;QTreeView::hideColumn, view, event-&gt;columnAt (event-&gt;x()))); </code></pre> <p>Is any of this do-able?</p>
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    1. CONow that Qt 5 supports C++0x lambdas, all of this messiness can be disposed of. See http://qt-project.org/doc/qt-5.0/qtcore/qobject.html#connect-5
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