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<h1>Source code for TermTk.TTkCore.signal</h1><div class="highlight"><pre>
<span></span><span class="c1"># MIT License</span>
<span class="c1">#</span>
<span class="c1"># Copyright (c) 2021 Eugenio Parodi &lt;ceccopierangiolieugenio AT googlemail DOT com&gt;</span>
<span class="c1">#</span>
<span class="c1"># Permission is hereby granted, free of charge, to any person obtaining a copy</span>
<span class="c1"># of this software and associated documentation files (the &quot;Software&quot;), to deal</span>
<span class="c1"># in the Software without restriction, including without limitation the rights</span>
<span class="c1"># to use, copy, modify, merge, publish, distribute, sublicense, and/or sell</span>
<span class="c1"># copies of the Software, and to permit persons to whom the Software is</span>
<span class="c1"># furnished to do so, subject to the following conditions:</span>
<span class="c1">#</span>
<span class="c1"># The above copyright notice and this permission notice shall be included in all</span>
<span class="c1"># copies or substantial portions of the Software.</span>
<span class="c1">#</span>
<span class="c1"># THE SOFTWARE IS PROVIDED &quot;AS IS&quot;, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR</span>
<span class="c1"># IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,</span>
<span class="c1"># FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE</span>
<span class="c1"># AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER</span>
<span class="c1"># LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,</span>
<span class="c1"># OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE</span>
<span class="c1"># SOFTWARE.</span>
<span class="c1"># ref: http://pyqt.sourceforge.net/Docs/PyQt5/signals_slots.html</span>
<span class="c1"># https://github.com/ceccopierangiolieugenio/pyCuT/blob/master/cupy/CuTCore/CuSignal.py</span>
<span class="sd">&#39;&#39;&#39;</span>
<span class="sd">Signals &amp; Slots [`Tutorial &lt;https://ceccopierangiolieugenio.github.io/pyTermTk/tutorial/003-signalslots.html&gt;`__]</span>
<span class="sd">=========================================================================================================================</span>
<span class="sd"> Signals and slots are used for communication between objects.</span>
<span class="sd">Intro</span>
<span class="sd">=====</span>
<span class="sd">| The :mod:`TermTk.TTkCore.signal` is more than heavily inspired by `Qt5 Signal&amp;Slots &lt;(https://www.riverbankcomputing.com/static/Docs/PyQt5/signals_slots.html&gt;`_</span>
<span class="sd">| https://doc.qt.io/qt-5/signalsandslots.html</span>
<span class="sd">| In GUI programming, when we change one widget, we often want another widget to be notified.</span>
<span class="sd">| More generally, we want objects of any kind to be able to communicate with one another.</span>
<span class="sd">| For example, if a user clicks a Close button, we probably want the window&#39;s close() function to be called.</span>
<span class="sd">Signal and Slots</span>
<span class="sd">================</span>
<span class="sd">| A signal is emitted when a particular event occurs.</span>
<span class="sd">| A slot is a function that is called in response to a particular signal.</span>
<span class="sd">| `TermTk &lt;https://github.com/ceccopierangiolieugenio/pyTermTk&gt;`_&#39;s :mod:`~TermTk.TTkWidgets` have many predefined signals/slots, but it is possible to subclass any :mod:`~TermTk.TTkWidgets` and add our own signals/slots to them.</span>
<span class="sd">.. image:: /../_images/Signal.Slots.001.svg</span>
<span class="sd">Methods</span>
<span class="sd">=======</span>
<span class="sd">.. autofunction:: TermTk.pyTTkSignal</span>
<span class="sd">.. autodecorator:: TermTk.pyTTkSlot</span>
<span class="sd">&#39;&#39;&#39;</span>
<span class="n">__all__</span> <span class="o">=</span> <span class="p">[</span><span class="s1">&#39;pyTTkSlot&#39;</span><span class="p">,</span> <span class="s1">&#39;pyTTkSignal&#39;</span><span class="p">]</span>
<span class="kn">from</span> <span class="nn">inspect</span> <span class="kn">import</span> <span class="n">getfullargspec</span>
<span class="kn">from</span> <span class="nn">types</span> <span class="kn">import</span> <span class="n">LambdaType</span>
<span class="kn">from</span> <span class="nn">threading</span> <span class="kn">import</span> <span class="n">Lock</span>
<div class="viewcode-block" id="pyTTkSlot"><a class="viewcode-back" href="../../../autogen.TermTk/TermTk.TTkCore.signal.html#TermTk.pyTTkSlot">[docs]</a><span class="k">def</span> <span class="nf">pyTTkSlot</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">pyTTkSlot_d</span><span class="p">(</span><span class="n">func</span><span class="p">):</span>
<span class="c1"># Add signature attributes to the function</span>
<span class="n">func</span><span class="o">.</span><span class="n">_TTkslot_attr</span> <span class="o">=</span> <span class="n">args</span>
<span class="k">return</span> <span class="n">func</span>
<span class="k">return</span> <span class="n">pyTTkSlot_d</span></div>
<div class="viewcode-block" id="pyTTkSignal"><a class="viewcode-back" href="../../../autogen.TermTk/TermTk.TTkCore.signal.html#TermTk.pyTTkSignal">[docs]</a><span class="k">def</span> <span class="nf">pyTTkSignal</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="k">return</span> <span class="n">_pyTTkSignal_obj</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span></div>
<span class="k">class</span> <span class="nc">_pyTTkSignal_obj</span><span class="p">():</span>
<span class="n">_signals</span> <span class="o">=</span> <span class="p">[]</span>
<span class="vm">__slots__</span> <span class="o">=</span> <span class="p">(</span><span class="s1">&#39;_types&#39;</span><span class="p">,</span> <span class="s1">&#39;_name&#39;</span><span class="p">,</span> <span class="s1">&#39;_revision&#39;</span><span class="p">,</span> <span class="s1">&#39;_connected_slots&#39;</span><span class="p">,</span> <span class="s1">&#39;_mutex&#39;</span><span class="p">)</span>
<span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="c1"># ref: http://pyqt.sourceforge.net/Docs/PyQt5/signals_slots.html#PyQt5.QtCore.pyqtSignal</span>
<span class="c1"># PyQt5.QtCore.pyqtSignal(types[, name[, revision=0[, arguments=[]]]])</span>
<span class="c1"># Create one or more overloaded unbound signals as a class attribute.</span>
<span class="c1"># Parameters:</span>
<span class="c1"># types - the types that define the C++ signature of the signal. Each type may be a Python type object or a string that is the name of a C++ type. Alternatively each may be a sequence of type arguments. In this case each sequence defines the signature of a different signal overload. The first overload will be the default.</span>
<span class="c1"># name - the name of the signal. If it is omitted then the name of the class attribute is used. This may only be given as a keyword argument.</span>
<span class="c1"># revision - the revision of the signal that is exported to QML. This may only be given as a keyword argument.</span>
<span class="c1"># arguments - the sequence of the names of the signal&#39;s arguments that is exported to QML. This may only be given as a keyword argument.</span>
<span class="c1"># Return type:</span>
<span class="c1"># an unbound signal</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_types</span> <span class="o">=</span> <span class="n">args</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_name</span> <span class="o">=</span> <span class="n">kwargs</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;name&#39;</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_revision</span> <span class="o">=</span> <span class="n">kwargs</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;revision&#39;</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_connected_slots</span> <span class="o">=</span> <span class="p">{}</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_mutex</span> <span class="o">=</span> <span class="n">Lock</span><span class="p">()</span>
<span class="n">_pyTTkSignal_obj</span><span class="o">.</span><span class="n">_signals</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">connect</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">slot</span><span class="p">):</span>
<span class="c1"># ref: http://pyqt.sourceforge.net/Docs/PyQt5/signals_slots.html#connect</span>
<span class="c1"># connect(slot[, type=PyQt5.QtCore.Qt.AutoConnection[, no_receiver_check=False]]) -&gt; PyQt5.QtCore.QMetaObject.Connection</span>
<span class="c1"># Connect a signal to a slot. An exception will be raised if the connection failed.</span>
<span class="c1"># Parameters:</span>
<span class="c1"># slot - the slot to connect to, either a Python callable or another bound signal.</span>
<span class="c1"># type - the type of the connection to make.</span>
<span class="c1"># no_receiver_check - suppress the check that the underlying C++ receiver instance still exists and deliver the signal anyway.</span>
<span class="c1"># Returns:</span>
<span class="c1"># a Connection object which can be passed to disconnect(). This is the only way to disconnect a connection to a lambda function.</span>
<span class="n">spec</span> <span class="o">=</span> <span class="n">getfullargspec</span><span class="p">(</span><span class="n">slot</span><span class="p">)</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">slot</span><span class="p">,</span> <span class="n">LambdaType</span><span class="p">)</span> <span class="ow">and</span> <span class="n">slot</span><span class="o">.</span><span class="vm">__name__</span> <span class="o">==</span> <span class="s2">&quot;&lt;lambda&gt;&quot;</span><span class="p">:</span>
<span class="n">nargs</span> <span class="o">=</span> <span class="nb">len</span><span class="p">(</span><span class="n">spec</span><span class="o">.</span><span class="n">args</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">spec</span><span class="o">.</span><span class="n">varargs</span><span class="p">:</span>
<span class="n">nargs</span> <span class="o">=</span> <span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_types</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">nargs</span> <span class="o">=</span> <span class="nb">len</span><span class="p">(</span><span class="n">spec</span><span class="o">.</span><span class="n">args</span><span class="p">)</span> <span class="o">-</span> <span class="p">(</span><span class="mi">1</span> <span class="k">if</span> <span class="p">(</span><span class="nb">hasattr</span><span class="p">(</span><span class="n">slot</span><span class="p">,</span> <span class="s1">&#39;__self__&#39;</span><span class="p">))</span> <span class="k">else</span> <span class="mi">0</span><span class="p">)</span>
<span class="n">ndef</span> <span class="o">=</span> <span class="mi">0</span> <span class="k">if</span> <span class="ow">not</span> <span class="n">spec</span><span class="o">.</span><span class="n">defaults</span> <span class="k">else</span> <span class="nb">len</span><span class="p">(</span><span class="n">spec</span><span class="o">.</span><span class="n">defaults</span><span class="p">)</span>
<span class="k">if</span> <span class="n">nargs</span><span class="o">-</span><span class="n">ndef</span> <span class="o">&gt;</span> <span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_types</span><span class="p">):</span>
<span class="n">error</span> <span class="o">=</span> <span class="sa">f</span><span class="s2">&quot;Decorated slot has no signature compatible: </span><span class="si">{</span><span class="n">slot</span><span class="o">.</span><span class="vm">__name__</span><span class="si">}</span><span class="s2"> </span><span class="si">{</span><span class="n">spec</span><span class="si">}</span><span class="s2"> != signal</span><span class="si">{</span><span class="bp">self</span><span class="o">.</span><span class="n">_types</span><span class="si">}</span><span class="s2">&quot;</span>
<span class="k">raise</span> <span class="ne">TypeError</span><span class="p">(</span><span class="n">error</span><span class="p">)</span>
<span class="k">if</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">slot</span><span class="p">,</span> <span class="s1">&#39;_TTkslot_attr&#39;</span><span class="p">):</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">slot</span><span class="o">.</span><span class="n">_TTkslot_attr</span><span class="p">)</span> <span class="o">&gt;</span> <span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_types</span><span class="p">):</span>
<span class="n">error</span> <span class="o">=</span> <span class="s2">&quot;Decorated slot has no signature compatible: &quot;</span><span class="o">+</span><span class="n">slot</span><span class="o">.</span><span class="vm">__name__</span><span class="o">+</span><span class="nb">str</span><span class="p">(</span><span class="n">slot</span><span class="o">.</span><span class="n">_TTkslot_attr</span><span class="p">)</span><span class="o">+</span><span class="s2">&quot; != signal&quot;</span><span class="o">+</span><span class="nb">str</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_types</span><span class="p">)</span>
<span class="k">raise</span> <span class="ne">TypeError</span><span class="p">(</span><span class="n">error</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">for</span> <span class="n">a</span><span class="p">,</span><span class="n">b</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">(</span><span class="n">slot</span><span class="o">.</span><span class="n">_TTkslot_attr</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_types</span><span class="p">):</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">issubclass</span><span class="p">(</span><span class="n">a</span><span class="p">,</span><span class="n">b</span><span class="p">):</span>
<span class="n">error</span> <span class="o">=</span> <span class="s2">&quot;Decorated slot has no signature compatible: &quot;</span><span class="o">+</span><span class="n">slot</span><span class="o">.</span><span class="vm">__name__</span><span class="o">+</span><span class="nb">str</span><span class="p">(</span><span class="n">slot</span><span class="o">.</span><span class="n">_TTkslot_attr</span><span class="p">)</span><span class="o">+</span><span class="s2">&quot; != signal&quot;</span><span class="o">+</span><span class="nb">str</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_types</span><span class="p">)</span>
<span class="k">raise</span> <span class="ne">TypeError</span><span class="p">(</span><span class="n">error</span><span class="p">)</span>
<span class="k">if</span> <span class="n">slot</span> <span class="ow">not</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_connected_slots</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_connected_slots</span><span class="p">[</span><span class="n">slot</span><span class="p">]</span><span class="o">=</span><span class="nb">slice</span><span class="p">(</span><span class="n">nargs</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">disconnect</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="k">for</span> <span class="n">slot</span> <span class="ow">in</span> <span class="n">args</span><span class="p">:</span>
<span class="k">if</span> <span class="n">slot</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_connected_slots</span><span class="p">:</span>
<span class="k">del</span> <span class="bp">self</span><span class="o">.</span><span class="n">_connected_slots</span><span class="p">[</span><span class="n">slot</span><span class="p">]</span>
<span class="k">def</span> <span class="nf">emit</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">_mutex</span><span class="o">.</span><span class="n">acquire</span><span class="p">(</span><span class="kc">False</span><span class="p">):</span> <span class="k">return</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">args</span><span class="p">)</span> <span class="o">!=</span> <span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_types</span><span class="p">):</span>
<span class="n">error</span> <span class="o">=</span> <span class="s2">&quot;func&quot;</span><span class="o">+</span><span class="nb">str</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_types</span><span class="p">)</span><span class="o">+</span><span class="s2">&quot; signal has &quot;</span><span class="o">+</span><span class="nb">str</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_types</span><span class="p">))</span><span class="o">+</span><span class="s2">&quot; argument(s) but &quot;</span><span class="o">+</span><span class="nb">str</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">args</span><span class="p">))</span><span class="o">+</span><span class="s2">&quot; provided&quot;</span>
<span class="k">raise</span> <span class="ne">TypeError</span><span class="p">(</span><span class="n">error</span><span class="p">)</span>
<span class="k">for</span> <span class="n">slot</span><span class="p">,</span><span class="n">sl</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_connected_slots</span><span class="o">.</span><span class="n">copy</span><span class="p">()</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
<span class="n">slot</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">[</span><span class="n">sl</span><span class="p">],</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_mutex</span><span class="o">.</span><span class="n">release</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">clear</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_connected_slots</span> <span class="o">=</span> <span class="p">{}</span>
<span class="nd">@staticmethod</span>
<span class="k">def</span> <span class="nf">clearAll</span><span class="p">():</span>
<span class="k">for</span> <span class="n">s</span> <span class="ow">in</span> <span class="n">_pyTTkSignal_obj</span><span class="o">.</span><span class="n">_signals</span><span class="p">:</span>
<span class="n">s</span><span class="o">.</span><span class="n">clear</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">forward</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">_ret</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">emit</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
<span class="k">return</span> <span class="n">_ret</span>
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