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< div class = "title" > EWOL: Object message < / div > < / div >
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< div class = "toc" > < h3 > Table of Contents< / h3 >
< ul > < li class = "level1" > < a href = "#ewol_tutorial_object_message_objectifs" > Objectifs: < / a > < / li >
< li class = "level1" > < a href = "#ewol_tutorial_object_message_system" > Message system < / a > < / li >
< li class = "level1" > < a href = "#ewol_tutorial_object_message_from_object" > Receive signals from other object < / a > < / li >
< li class = "level1" > < a href = "#ewol_tutorial_object_message_declare" > Declare Signal: < / a > < / li >
< 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 >
< h1 > < a class = "anchor" id = "ewol_tutorial_object_message_objectifs" > < / a >
Objectifs: < / h1 >
< ul >
< li > Understand base of < a href = "http://atria-soft.github.io/esignal" > e-signal< / a > Messaging system< / li >
< li > Create extern message and receive Object message< / li >
< / ul >
< h1 > < a class = "anchor" id = "ewol_tutorial_object_message_system" > < / a >
Message system < / h1 >
< p > esignal base his signal on landa functions< / p >
< p > It permit to an object to generate some **'signals'**< / p >
< p > All signal are synchronous *(asynchronous is not implemented yet)*< / p >
< h1 > < a class = "anchor" id = "ewol_tutorial_object_message_from_object" > < / a >
Receive signals from other object < / h1 >
< p > Register on the 'up' and 'value' signal of a button:< / p >
< 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 >
< 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 >
< 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 >
< 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 >
Declare Signal: < / h1 >
< h2 > source < / h2 >
< 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 >
Conclusion: < / h1 >
< p > You will now able to reise signals between objects...< / p >
< p > For more information see < a href = "http://atria-soft.github.io/esignal" > e-signal< / a > < / p >
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