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copied!<p>I think you can use two different approaches here: make the <code>A</code> and <code>B</code> classes tightly coupled, or using the main-window as mediator.</p> <p>In the first case you will have to "let <code>A</code> know <code>B</code>", meaning that <code>A</code> has a reference to <code>B</code>. In this case you don't even have to do signals & slots at all but you can simply call <code>B</code>'s methods directly.</p> <p>The other approach is to let <code>A</code> emit a signal <em>with an argument</em> containing the data that should be received by <code>B</code>, the main-window catches this signal and calls <code>B</code> with the data. Alternatively you can put the data in an <code>A</code>'s attribute and let the main-window take it from here directly, without passing it as signal's argument.</p> <p>The latter method allows you to write a bit more freely <code>A</code> and <code>B</code> since <code>A</code> does not have to know how to call <code>B</code>.</p> <p>Explained in code it should looks like this:</p> <pre><code>class A(QWidget): the_signal = Signal(...) def mouseReleaseEvent(self, event): self.a_function() self.the_data = self.produce_data() self.the_signal.emit() class B(QWidget): def process_data(self, data): pass class MainWindow(QMainWindow): def __init__(self): self.a_widget = A() self.b_widget = B() self.a_widget.the_signal.connect(self.do_process) # if the signal has the data as argument: # self.a_widget.the_signal.connect(self.b_widget.process_data) def do_process(self): self.b_widget.process_data(self.a_widget.the_data) </code></pre>

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