134 lines
3.1 KiB
Clojure
134 lines
3.1 KiB
Clojure
|
|
=== Objectif ===
|
|
:** Understand base of [lib[esignal]] Messaging system
|
|
:** Create extern message and receive Object message
|
|
|
|
== Message system ==
|
|
|
|
esignal base his signal on landa functions
|
|
|
|
It permit to an object to generate some [b]'signals'[/b].
|
|
|
|
All signal are synchronous [i](asynchronous is not implemented yet)[/i]
|
|
|
|
|
|
== Receive signals from other object ==
|
|
|
|
Register on the 'up' and 'value' signal of a button:
|
|
|
|
Button header :
|
|
[code style=c++]
|
|
...
|
|
public:
|
|
esignal::ISignal<> signalDown;
|
|
esignal::ISignal<> signalUp;
|
|
...
|
|
esignal::ISignal<bool> signalValue;
|
|
...
|
|
[/code]
|
|
|
|
=== simple signal connection: ===
|
|
|
|
[code style=c++]
|
|
#include <ewol/object/Object.h>
|
|
#include <ewol/widget/Button.h>
|
|
namespace appl {
|
|
class MyObj : public ewol::Object {
|
|
private:
|
|
ewol::widget::ButtonShared m_button;
|
|
esignal::Connection m_connect;
|
|
protected:
|
|
//! @brief Constructor
|
|
MyObj() {
|
|
// nothing to do..
|
|
}
|
|
void init() {
|
|
ewol::Object::init();
|
|
m_button = ewol::widget::Button::Create();
|
|
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(shared_from_this(), &appl::MyObj::onCallbackUp);
|
|
m_button->signalValue.connect(shared_from_this(), &appl::MyObj::onCallbackValue);
|
|
}
|
|
public:
|
|
//! @brief Destructor
|
|
virtual ~MyObj() { }
|
|
DECLARE_FACTORY(MyObj);
|
|
private:
|
|
void onCallbackUp() {
|
|
APPL_INFO("button pressed: UP");
|
|
}
|
|
void onCallbackDown() {
|
|
APPL_INFO("button pressed: DOWN");
|
|
}
|
|
void onCallbackValue(const bool& _value) {
|
|
APPL_INFO("button value: " << _value);
|
|
if (_value == true) {
|
|
// We connect signals here: (removable connection)
|
|
m_connect = m_button->signalDown.connect(this, &appl::MyObj::onCallbackDown);
|
|
} else {
|
|
// we disconnect the previous connection
|
|
m_connect.disconnect();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
[/code]
|
|
|
|
[note]
|
|
The connection with SharedPtr are static. they keep in internal a WeakPtr to remove connection if the object is removed.
|
|
[/note]
|
|
|
|
[note]
|
|
The connection that return a [class[esignal::Connection]] are volatil, if you don't keep the connection handle, the connection is automaticly removed.
|
|
[/note]
|
|
|
|
== Declare Signal ==
|
|
|
|
=== source ===
|
|
|
|
[code style=c++]
|
|
#include <ewol/object/Object.h>
|
|
#include <ewol/widget/Button.h>
|
|
namespace appl {
|
|
class MyObj : public ewol::Object {
|
|
public:
|
|
ewol::object::Signal<> signalEmpty;
|
|
ewol::object::Signal<bool> signalBoolean;
|
|
ewol::object::Signal<std::string> signalString;
|
|
protected:
|
|
//! @brief Constructor
|
|
MyObj() :
|
|
signalEmpty(this, "empty"),
|
|
signalBoolean(this, "boolean"),
|
|
signalString(this, "string") {
|
|
// nothing to do..
|
|
}
|
|
public:
|
|
//! @brief Destructor
|
|
virtual ~MyObj() { }
|
|
DECLARE_FACTORY(MyObj);
|
|
private:
|
|
void process() {
|
|
signalEmpty.emit();
|
|
signalBoolean.emit(false);
|
|
signalString.emit("plop... plop");
|
|
}
|
|
}
|
|
}
|
|
[/code]
|
|
|
|
== Conclusion ==
|
|
|
|
You will now able to reise signals between objects...
|
|
|
|
For more information see [lib[esignal]]
|
|
|
|
|
|
|
|
|