Databases
StackOverflow2013
Postsdbo
POPython decorator to aggregate PyQt signals
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POPython decorator to aggregate PyQt signals
    primarykey
    data
    text
    <p>I often have many signals that would ideally be processed all at once. For example, the signal that triggers an update to an OpenGL window can be aggregated into a single signal. Another example is the signal that dirties a row in a table.</p> <p>Ideally, I'd like the decorator to generate code something like what's below (between START and END):</p> <pre><code>#!/usr/bin/env python from PyQt4.QtCore import * from PyQt4.QtGui import * from functools import wraps import signal import sys signal.signal(signal.SIGINT, signal.SIG_DFL) class AggregateManager: def __init__(self): self.clear() def clear(self): self.sent = False self.value = 0 def aggregate(self, other): send = not self.sent self.sent = True self.value += other return send class A(QObject): def __init__(self): super().__init__() # START self.generated_signal.connect(self.slot, Qt.QueuedConnection) self.slot_manager = AggregateManager() @pyqtSlot(int) def decorated_slot(self, *args): me = self.slot_manager if me.aggregate(*args): print("Sending") self.generated_signal.emit() generated_signal = pyqtSignal() @pyqtSlot() def slot(self): me = self.slot_manager print("Received", me.value) me.clear() # END class B(QObject): signal = pyqtSignal(int) a = A() b = B() b.signal.connect(a.decorated_slot) for i in range(10): b.signal.emit(i) app = QApplication(sys.argv) sys.exit(app.exec_()) </code></pre> <p>This way, a single call to <code>slot</code> is made for many signals sent to decorated_slot. How do I use Python decorators to replace everything between START and END?</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USNeil G
    1. USNeil G
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POPython decorator to aggregate PyQt signals
      1. This table or related slice is empty.
      1. VTUpMod
    1. COhow do you decide when you're done populating the sent list (and thus, when to call the combined slot() method)?
      singulars
      1. POPython decorator to aggregate PyQt signals
      1. USlunixbochs
    2. COBecause the `generated_signal` is connected with a QueuedConnection, the generated_signal is sent immediately on the event loop, but all of the calls to `signal` that happen before that are aggregated.
      singulars
      1. POPython decorator to aggregate PyQt signals
      1. USNeil G
    3. CORecently I made a system for binding to wxPython events using decorators, maybe you can get some hints from it. http://bitbucket.org/raz/wxeventbinder
      singulars
      1. POPython decorator to aggregate PyQt signals
      1. USToni Ruža
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload