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pyTermTk/tutorial/003-signalslots.md

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pyTermTk - Signal & Slots

Intro

The TermTk Signal&Slots and more than heavily inspired by Qt5 Signal&Slots https://doc.qt.io/qt-5/signalsandslots.html

Example 1 - basic signal slots

From example1.basic.signalslots.py

import TermTk as ttk

ttk.TTkLog.use_default_stdout_logging()

    # define 2 signals with different signatures
signal = ttk.pyTTkSignal()
otherSignal = ttk.pyTTkSignal(int)


    # Define a slot with no input as signature
@ttk.pyTTkSlot()
def slot():
    ttk.TTkLog.debug("Received a simple signal")

    # Define 2 slots with "int" as input signature
@ttk.pyTTkSlot(int)
def otherSlot(val):
    ttk.TTkLog.debug(f"[otherSlot] Received a valued signal, val:{val}")

@ttk.pyTTkSlot(int)
def anotherSlot(val):
    ttk.TTkLog.debug(f"[anootherSlot] Received a valued signal, val:{val}")


    # connect the signals to the proper slot
signal.connect(slot)
otherSignal.connect(otherSlot)
otherSignal.connect(anotherSlot)

    # Test the signals
ttk.TTkLog.debug("Emit a simple signal")
signal.emit()
ttk.TTkLog.debug("Emit a valued signal")
otherSignal.emit(123)

The above code produces the following output

 $  tutorial/signalslots/example1.basic.signalslots.py
DEBUG:(MainThread) tutorial/signalslots/example1.basic.signalslots.py:54 Emit a simple signal
DEBUG:(MainThread) tutorial/signalslots/example1.basic.signalslots.py:37 Received a simple signal
DEBUG:(MainThread) tutorial/signalslots/example1.basic.signalslots.py:56 Emit a valued signal
DEBUG:(MainThread) tutorial/signalslots/example1.basic.signalslots.py:42 [otherSlot] Received a valued signal, val:123
DEBUG:(MainThread) tutorial/signalslots/example1.basic.signalslots.py:45 [anootherSlot] Received a valued signal, val:123

Example 2 - Use widgets signals and slots

From example2.widgets.signalslots.py

import TermTk as ttk

root = ttk.TTk()

    # Create a window with a logviewer
logWin = ttk.TTkWindow(parent=root,pos = (10,2), size=(80,20), title="LogViewer Window", border=True, layout=ttk.TTkVBoxLayout())
ttk.TTkLogViewer(parent=logWin)

    # Create 2 buttons
btnShow = ttk.TTkButton(parent=root, text="Show", pos=(0,0), size=(10,3), border=True)
btnHide = ttk.TTkButton(parent=root, text="Hide", pos=(0,3), size=(10,3), border=True)

    # Connect the btnShow's "clicked" signal with the window's "show" slot
btnShow.clicked.connect(logWin.show)
    # Connect the btnHide's "clicked" signal with the window's "hide" slot
btnHide.clicked.connect(logWin.hide)

root.mainloop()

It is totally useless for this example but the above code produces the following output

┌────────┐
│  Show  │
╘════════╛╔══════════════════════════════════════════════════════════════════════════════╗
┌────────┐║ LogViewer Window                                                             ║
│  Hide  │╟──────────────────────────────────────────────────────────────────────────────╢
╘════════╛║                                                                              ║
          ║DEBUG: _/.venv/lib/python3.8/site-packages/TermTk/TTkCore/ttk.py:70 Starting M║
          ║DEBUG: _/.venv/lib/python3.8/site-packages/TermTk/TTkCore/ttk.py:80 Signal Eve║
          ║DEBUG: _/.venv/lib/python3.8/site-packages/TermTk/TTkCore/ttk.py:65 fps: 33   ║
          ║DEBUG: _/.venv/lib/python3.8/site-packages/TermTk/TTkCore/ttk.py:65 fps: 34   ║
          ║DEBUG: _/.venv/lib/python3.8/site-packages/TermTk/TTkCore/ttk.py:65 fps: 34   ║
          ║                                                                              ║
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