TouchGFX: How handle instructions on pressed/unpressed button

Question

How can I handle a button in TouchGFX that allows me to switch on a LED when it is pressed, and switch off it when I release the button? The following code works but it switches the LED on/off every time you touch/untouch the screen...

void Screen1View::handleClickEvent(const ClickEvent& event)
{
  if((event.getType() == ClickEvent::PRESSED))
  {

    HAL_GPIO_WritePin(LD1_GPIO_Port, LD1_Pin, GPIO_PIN_SET);
    HAL_Delay(50);
  }
 if((event.getType() == ClickEvent::RELEASED))
  {
     HAL_GPIO_WritePin(LD1_GPIO_Port, LD1_Pin, GPIO_PIN_RESET);
  }
}

If I use "flexButtonCallbackHandler(const touchgfx::AbstractButtonContainer& event)" function I can detect if button1, button2, etc were pressed, but I cannot detect if a button was released ... Any suggest?

score 0 · Answer 1 · answered Mar 27 '21 at 00:35

The standard Button class in TouchGFX only triggers on clicked. You can check the source code for AbstractButton::handleClickEvent() to see how the code works. Button inherits from this class and adds functionality like clicked/released images.

In order to do what you want, you have to create a new class that implements the behavior you want. Checking the source code for AbstractButton this should be straight forward to issue a callback for both clicked and released events.

TouchGFX: How handle instructions on pressed/unpressed button

1 Answers1