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POTrouble getting `QWidget* editor` for a `QModelIndex`
 

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  1. POTrouble getting `QWidget* editor` for a `QModelIndex`
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    <p>I am having trouble augmenting the default edit behavior of <a href="http://qt-project.org/doc/qt-4.8/qtableview.html" rel="nofollow"><code>QTableView</code></a>. I want the following behavior when the Enter key is pressed:</p> <ol> <li>Start editing the current cell if it is not already being edited.</li> <li>If the cell is being edited, <ul> <li>2a. commit the data and close the editor. Then,</li> <li>2b. make the cell below, if present, the current cell.</li> </ul></li> </ol> <p>2a is the default behavior, and 2b can likely be achieved by using <a href="http://qt-project.org/doc/qt-4.8/qabstractitemview.html#setCurrentIndex" rel="nofollow"><code>QAbstractItemView::setCurrentIndex()</code></a> in a re-implementation of <a href="http://qt-project.org/doc/qt-4.8/qitemdelegate.html#eventFilter" rel="nofollow"><code>QItemDelegate::eventFilter()</code></a> (as suggested <a href="http://qt-project.org/faq/answer/how_can_i_make_the_focus_go_from_one_cell_to_the_next_when_hitting_enter" rel="nofollow">here</a> in a similar context).</p> <p>The problem is in achieving 1. I list below the approaches I have tried till now.</p> <ul> <li><strong>Reconfigure the "platform edit key"</strong> By default, "Editing starts when the platform edit key has been pressed over an item." (<a href="http://qt-project.org/doc/qt-4.8/qabstractitemview.html#EditTrigger-enum" rel="nofollow"><code>QAbstractItemView::EditKeyPressed</code></a>) This key is F2 on my platform (Ubuntu 12.04). I could reconfigure the platform edit key to Enter but <ul> <li>Altering platform defaults seems like a bad idea.</li> <li>I could not find out how to do it.</li> </ul></li> <li><p><strong>Capture the Enter key press</strong> I use <a href="http://qt-project.org/doc/qt-4.8/qshortcut.html" rel="nofollow"><code>QShortCut</code></a> to do this as follows:</p> <pre><code>class CourseTable : public QTableView { /* ... */ }; /* ... */ CourseTable::CourseTable(/* ... */) { /* ... */ QShortcut* shortcut = new QShortcut(QKeySequence(Qt::Key_Return), this); connect(shortcut, SIGNAL(activated()), this, SLOT(handleEnter_())); /* ... */ } /* ... */ void CourseTable::handleEnter_() { QModelIndex idx = this-&gt;currentIndex(); if (this-&gt;state() != QAbstractItemView::EditingState) this-&gt;edit(idx); /* else // see below */ } </code></pre> <p>This does capture the Enter key-press and accomplishes 1 (from above) but now 2 is broken. So, I need to look into the <code>else</code> clause in <code>CourseTable::handleEnter_()</code> above, possibly calling <a href="http://qt-project.org/doc/qt-4.8/qabstractitemview.html#commitData" rel="nofollow"><code>QAbstractItemView::commitData()</code></a> and <a href="http://qt-project.org/doc/qt-4.8/qabstractitemview.html#closeEditor" rel="nofollow"><code>QAbstractItemView::closeEditor</code></a> in it. The problem is that both these functions require a <code>QWidget *editor</code> argument which I just cannot figure out how to get. I could subclass <a href="http://qt-project.org/doc/qt-4.8/qabstractitemdelegate.html" rel="nofollow"><code>QAbstractItemDelegate</code></a>, add a <code>getEditor()</code> method to the derived class, and modify existing code to pass instances of the derived delegate class to <code>CourseTable::setItemDelegate*()</code> functions. But that sounds like too much work.</p></li> </ul> <p>So, any ideas how I can cleanly accomplish both 1 and 2 without having to rewrite my code?</p>
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    1. COSo then, `QWidget* QItemDelegate::createEditor()` turns out to be a `const` function, so I cannot even save a pointer to the created editor in a member variable.
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