[Qt-interest] Book: C++ GUI Programming with Qt 4 (2nd ed.) online+free+legal

[Mark Summerfield]

On 2009-11-16, Johannes Kleimola wrote:
> Hi!
> 
> So there is a small error in the printed book and downloadable example
> source code after all. And I seem to have come up with the same solution
> as you had locally. Should the error be stated on the mailing list as
> well, to not confuse other readers?

Yes, of course!

So for the diagram example, in diagramwindow.cpp the
DiagramWindow::updateActions() method should be:


    void DiagramWindow::updateActions()
    {
	bool hasSelection = !scene->selectedItems().isEmpty();
	bool isNode = (selectedNode() != 0);
	bool isNodePair = (selectedNodePair() != NodePair());
	bool isLink = (selectedLink() != 0);

	cutAction->setEnabled(isNode);
	copyAction->setEnabled(isNode);
	addLinkAction->setEnabled(isNodePair);
	deleteAction->setEnabled(hasSelection);
	bringToFrontAction->setEnabled(isNode);
	sendToBackAction->setEnabled(isNode);
	propertiesAction->setEnabled(isNode || isLink);

	foreach (QAction *action, view->actions())
	    view->removeAction(action);

	foreach (QAction *action, editMenu->actions()) {
	    if (action->isEnabled())
		view->addAction(action);
	}
    }

Thanks again for pointing it out:-)

-- 
Mark Summerfield, Qtrac Ltd, www.qtrac.eu
    C++, Python, Qt, PyQt - training and consultancy
	"Advanced Qt Programming" - ISBN 0321635906