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<div class="title">EWOL: Object message </div> </div>
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<div class="contents">
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<div class="toc"><h3>Table of Contents</h3>
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<ul><li class="level1"><a href="#ewol_tutorial_object_message_objectifs">Objectifs: </a></li>
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<li class="level1"><a href="#ewol_tutorial_object_message_system">Message system </a></li>
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<li class="level1"><a href="#ewol_tutorial_object_message_from_object">Receive signals from other object </a></li>
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<li class="level1"><a href="#ewol_tutorial_object_message_declare">Declare Signal: </a></li>
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<li class="level1"><a href="#ewol_tutorial_object_message_conclusion">Conclusion: </a></li>
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<div class="textblock"><p>Constructor MyObj() { // nothing to do.. } void <a class="elRef" doxygen="/home/heero/dev/perso/out/doc/release/etk.tag:http://atria-soft.github.io/etk/" href="http://atria-soft.github.io/etk/namespaceetk.html#aa87d94d7a27bd41c9982fe0ba83d6f88">init()</a> { ewol::Object::init(); m_button = <a class="el" href="message_8hpp.html#abc42ae0f5f36d369f8e81d14741c2a48" title="Create a simple pop-up message on the screen for application error. ">ewol::widget::Button::create()</a>; if (m_button == nullptr) { APPL_ERROR("Can not create button..."); return; } m_button->propertyToggle.set(true); // We connect signals here: (permanent connection) m_button->signalUp.connect(sharedFromThis(), &appl::MyObj::onCallbackUp); m_button->signalValue.connect(sharedFromThis(), &appl::MyObj::onCallbackValue); } public: //!</p>
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<h1><a class="anchor" id="ewol_tutorial_object_message_objectifs"></a>
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Objectifs: </h1>
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<ul>
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<li>Understand base of <a href="http://atria-soft.github.io/esignal">e-signal</a> Messaging system</li>
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<li>Create extern message and receive Object message</li>
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</ul>
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<h1><a class="anchor" id="ewol_tutorial_object_message_system"></a>
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Message system </h1>
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<p>esignal base his signal on landa functions</p>
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<p>It permit to an object to generate some **'signals'**</p>
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<p>All signal are synchronous *(asynchronous is not implemented yet)*</p>
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<h1><a class="anchor" id="ewol_tutorial_object_message_from_object"></a>
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Receive signals from other object </h1>
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<p>Register on the 'up' and 'value' signal of a button:</p>
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<p>Button header : </p><div class="fragment"><div class="line">...</div><div class="line">public:</div><div class="line"> esignal::Signal<> signalDown;</div><div class="line"> esignal::Signal<> signalUp;</div><div class="line"> ...</div><div class="line"> esignal::Signal<bool> signalValue;</div><div class="line">...</div></div><!-- fragment --><h2>simple signal connection: </h2>
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<div class="fragment"><div class="line"><span class="preprocessor">#include <<a class="code" href="_object_8hpp.html">ewol/object/Object.hpp</a>></span></div><div class="line"><span class="preprocessor">#include <<a class="code" href="_button_8hpp.html">ewol/widget/Button.hpp</a>></span></div><div class="line"><span class="keyword">namespace </span>appl {</div><div class="line"> <span class="keyword">class </span>MyObj : <span class="keyword">public</span> <a class="code" href="classewol_1_1_object.html">ewol::Object</a> {</div><div class="line"> <span class="keyword">private</span>:</div><div class="line"> <a class="codeRef" doxygen="/home/heero/dev/perso/out/doc/release/ememory.tag:http://atria-soft.github.io/ememory/" href="http://atria-soft.github.io/ememory/classememory_1_1_shared_ptr.html">ewol::widget::ButtonShared</a> m_button;</div><div class="line"> esignal::Connection m_connect;</div><div class="line"> <span class="keyword">protected</span>:</div><div class="line"> <span class="keyword">virtual</span> ~MyObj() { }</div><div class="line"> DECLARE_FACTORY(MyObj);</div><div class="line"> <span class="keyword">private</span>:</div><div class="line"> <span class="keywordtype">void</span> onCallbackUp() {</div><div class="line"> APPL_INFO(<span class="stringliteral">"button pressed: UP"</span>);</div><div class="line"> }</div><div class="line"> <span class="keywordtype">void</span> onCallbackDown() {</div><div class="line"> APPL_INFO(<span class="stringliteral">"button pressed: DOWN"</span>);</div><div class="line"> }</div><div class="line"> <span class="keywordtype">void</span> onCallbackValue(<span class="keyword">const</span> <span class="keywordtype">bool</span>& _value) {</div><div class="line"> APPL_INFO(<span class="stringliteral">"button value: "</span> << _value);</div><div class="line"> <span class="keywordflow">if</span> (_value == <span class="keyword">true</span>) {</div><div class="line"> <span class="comment">// We connect signals here: (removable connection)</span></div><div class="line"> m_connect = m_button->signalDown.connect(<span class="keyword">this</span>, &appl::MyObj::onCallbackDown);</div><div class="line"> } <span class="keywordflow">else</span> {</div><div class="line"> <span class="comment">// we disconnect the previous connection</span></div><div class="line"> m_connect.disconnect();</div><div class="line"> }</div><div class="line"> }</div><div class="line"> }</div><div class="line">}</div></div><!-- fragment --><p><b>Note:</b></p>
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<div class="fragment"><div class="line">The connection with SharedPtr are static. they keep in internal a WeakPtr to remove connection if the object is removed.</div></div><!-- fragment --><p><b>Note:</b></p>
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<div class="fragment"><div class="line">The connection that return a esignal::Connection are volatil, if you don't keep the connection handle, the connection is automaticly removed.</div></div><!-- fragment --><h1><a class="anchor" id="ewol_tutorial_object_message_declare"></a>
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Declare Signal: </h1>
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<h2>source </h2>
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<div class="fragment"><div class="line"><span class="preprocessor">#include <<a class="code" href="_object_8hpp.html">ewol/object/Object.hpp</a>></span></div><div class="line"><span class="preprocessor">#include <<a class="code" href="_button_8hpp.html">ewol/widget/Button.hpp</a>></span></div><div class="line"><span class="keyword">namespace </span>appl {</div><div class="line"> <span class="keyword">class </span>MyObj : <span class="keyword">public</span> <a class="code" href="classewol_1_1_object.html">ewol::Object</a> {</div><div class="line"> <span class="keyword">public</span>:</div><div class="line"> ewol::object::Signal<> signalEmpty;</div><div class="line"> ewol::object::Signal<bool> signalBoolean;</div><div class="line"> ewol::object::Signal<std::string> signalString;</div><div class="line"> <span class="keyword">protected</span>:</div><div class="line"> MyObj() :</div><div class="line"> signalEmpty(this, <span class="stringliteral">"empty"</span>),</div><div class="line"> signalBoolean(this, <span class="stringliteral">"boolean"</span>),</div><div class="line"> signalString(this, <span class="stringliteral">"string"</span>) {</div><div class="line"> <span class="comment">// nothing to do..</span></div><div class="line"> }</div><div class="line"> <span class="keyword">public</span>:</div><div class="line"> <span class="keyword">virtual</span> ~MyObj() { }</div><div class="line"> DECLARE_FACTORY(MyObj);</div><div class="line"> <span class="keyword">private</span>:</div><div class="line"> <span class="keywordtype">void</span> process() {</div><div class="line"> signalEmpty.emit();</div><div class="line"> signalBoolean.emit(<span class="keyword">false</span>);</div><div class="line"> signalString.emit(<span class="stringliteral">"plop... plop"</span>);</div><div class="line"> }</div><div class="line"> }</div><div class="line">}</div></div><!-- fragment --><h1><a class="anchor" id="ewol_tutorial_object_message_conclusion"></a>
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Conclusion: </h1>
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<p>You will now able to reise signals between objects...</p>
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<p>For more information see <a href="http://atria-soft.github.io/esignal">e-signal</a> </p>
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