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Common.md

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Common Input Events

InputEventType::ENABLED

Fired after an input is enabled.

InputEventType::DISABLED

Fired after an input is disabled.

InputEventType::IDLE

Fired after no event has been fired for the specified idle duration unless the input is disabled. By default this is 10 seconds.

Common Methods

The following methods are available in all input classes.

Setup

Setup methods are typically called from within setup() function but can be updated at runtime.

Setting a Callback for Free Functions

void setCallback(CallbackFunction func)

Sets the function to be called on the event being fired and takes a single argument of your function name.

Your function signature must match the input class. Eg for an EventButton:

  void onButtonEvent(InputEventType et, EventButton & eb) {
    ...
  }

and set the callback function as: myButton.setCallback(onButtonEvent);

Setting a Callback for Class Methods

Important: This method will be available only to boards that allow the use of std::function (ie #include <functional>) - you will additionally be offered an override of setCallback to easily set a class instance & method as the callback:

void setCallback(T* instance, void (T::*method))

As with the free function above, your method signature must match the input class. Eg for an EventButton:

  void Foo::onButtonEvent(InputEventType et, EventButton & eb) {
    ...
  }

and set the callback as: myButton.setCallback(&foo, &Foo::onButtonEvent);

Note: you can still pass a lambda to the free function setCallback if that is you preferred style: myButton.setCallback([&](EventButton &btn) { foo.onButtonEvent(btn); });

void unsetCallback()

Clear a callback that has been set. If using a class method, this must be called before the class instance is destroyed.

bool isCallbackSet()

Returns true if the callback has been set. Note: This does not guarantee the callback is still valid.

void enable(bool e = true);

Enable or disable a function. Default is to enable, pass false to disable.

void setIdleTimeout(unsigned int timeoutMs);

Set the idle timeout in ms. Default is 10000 (10 seconds).

void setInputId(uint8_t id);

Set the input identifier (not unique, default=0, not used internally). Used when multiple inputs share a common callback function such as a HAL.

void setInputValue(uint8_t val);

Set the input value (not unique, default=0, not used internally). This is intended to store an enum, be used to identify the purpose of a multi-function button.

void blockEvent(InputEventType et)

By default, all event types are fired, but this allows you to block an event to stop it from firing.

void allowEvent(InputEventType et)

Allow an event to fire that has previously been blocked.

void blockAllEvents()

Stop all events from firing - usually used in conjunction with allowEvent()

void allowAllEvents()

Clear all excluded event types (ie allow all events to fire).

bool isEventAllowed(InputEventType et)

Returns true if the event is not excluded.

Loop

void update()

Each input must have its update() method called within loop(). This reads the state of the input & pin(s) and fires the appropriate event type.

Status

bool isEnabled();

Returns true or false.

bool isIdle();

Returns true if no activity for longer than setIdleTimeout() or false if not - irrespective of whether the idle event type has been fired.

unsigned long msSinceLastEvent();

Returns the number of ms since any event was fired for this input.

uint8_t getInputId();

Get the button identifier. If not set will return 0.

uint8_t getInputValue();

Get the input value.