Signals And Slots Pyqt5
Signals And Slots Pyqt
Pyqt New Style Signals And Slots Wins
Signal Slot Pyqt
Pyqt5 Slots And Signals

While working on ape I had a problem with figuring out how to properly connect a signal to a slot, where the signal is emitted by a QTreeView widget. As this is not my first app with python and pyqt, I was doing something like (this is, btw, the “old style”):

Signals And Slots Pyqt5

The 'new-style' signal-slot connection mechanism is much better. Here's how the button click connection is done: thebutton.clicked.connect (self.onhello) This mechanism is supported by PyQt since version 4.5, and provides a safer and much more convenient way to connect signals and slots. Playtika uses cookies to store information on your computer. Some are essential to make this site Pyqt5 New Style Signals And Slots work; others help us improve your experience. You consent to the placement of these cookies. New-style PyQt Signals and Slots I was to lazy to take a look at the new-style signal and slot support which was introduced in PyQt 4.5 until yesterday. I did know that there were something called new-style signals and slots but that was the end of the story. PyQt5 signals and slots Graphical applications (GUI) are event-driven, unlike console or terminal applications. A users action like clicks a button or selecting an item in a list is called an event. If an event takes place, each PyQt5 widget can emit a signal.

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but it simply didn’t work. Nothing happened. I was trying all different of connect/signal/slot combinations but everything was just dead silent. Google gave only pretty much old posts talking about QT3. Then I figured that, because the QTreeView is “sitting” inside a QDockWidget, maybe that dock widget thingy is somehow intercepting/taking over the signals. Nope. Wth? Wtf is going on? Current pyqt version is (on my machine) 4.6. Last time I used pyqt it was something like 4.2 or 4.3. Something must’ve been changed in the mean time. Off to the pyqt docs I go (btw, I use the official QT docs, the C++ version, there isn’t really a big difference from pyqt): PyQt reference, chapter 7 - 'New-style Signal and Slot Support'. A-ha! They changed it! Here is an example of the “new style”:

Signals And Slots Pyqt

Oh my, isn’t that just beautiful?! Much more readable and simpler, for me at least. And it works! Yay! The QTreeView signals are happily connected to slots, thus, I’m happy too.

Pyqt New Style Signals And Slots Wins

A few paragraphs later, turns out that the “old style” isn’t thrown out, it should still work. Why it didn’t work for me escapes me at the moment, but honestly, I don’t really care as long as the new style is working.

Signal Slot Pyqt

Pyqt5 Slots And Signals

Happy hackin’!

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