CODEWITHSUNDEEP
c++qt
Roy D. Porter
Roy D. Porter

Reputation: 159

Using connect method to connect to a slot

I'm building an application that requires a Qdialog, and a few buttons.

I am attempting to use the Command behavioural design pattern in my implementation. My project so far has 4 classes. (Please excuse the rough UML)

Command
+execute()

zoomInAndOut : Command
+execute()

MenuItem
-QPushButton
-command
+clicked()

Dialog

So within the dialog class, I create a menuItem (which has a QPushButton and Command member variable), and what I need to happen is that when the menuItems button has been clicked, it calls the menuItems "clicked" method (which in turn calls the commands execute method). I know that the "connect" function must be used, however after many, many attempts, I cannot get it to work correctly.

Within Dialog the code roughly looks like this

zoomInAndOut zoomCommand;
menuItem *zoom = new menuItem(new QPushButton("Zoom", this), QRect(QPoint(300, 0), QSize(100, 50)), &zoomCommand);
connect(zoom->getButton(), SIGNAL(clicked()), SLOT(zoom->clicked()));

As mentioned before the connect method is completely wrong, but you can see what I am attempting to achieve. How can I make this work?

Thank you in advance for any help.

Upvotes: 0

Views: 64

Answers (2)

Shtol Krakov
Shtol Krakov

Reputation: 1280

Change code

connect(zoom->getButton(), SIGNAL(clicked()), SLOT(zoom->clicked()));

to

connect(zoom->getButton(), SIGNAL(clicked()), zoom, SLOT(clicked()));

Upvotes: 2

Aaron
Aaron

Reputation: 1191

Make sure your menuItem class contains the Q_OBJECT macro the line after the opening {. And make sure the clicked() method is in the slots section of the class body.

Upvotes: 1

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