Using while to wait after a button is clicked crashes the ui

[JPabl.1]

Hi there Touchgfx team!

I have this UI requirement to pop up a progress bar after the "read" button is clicked 

The progress bar will appear and go from 0 to 100 in 10 seconds. What I would like to do is that after the "read" button is clicked, I want to wait 10 seconds before continuing with the rest of the code. I tried a while but it crashes the UI. Here's my code: 

void calibrateView::read_calibration_step_flex_button_is_clicked()
{
    if (test_selected == QGA)
    {
        /* 1. send calibration read step to backend to get the value, This step can be triggered several times*/
        int calibration_rlu_atp1_value = presenter->notify_backend_read_calibration_step();

        // start_rlu_progress_bar_animation = true;
        customProgressBar.setVisible(true);
        customProgressBar.invalidate();
        start_rlu_progress_bar_animation = true;

this is where I want to wait the 10 seconds

        Unicode::UnicodeChar tempBuffer[20];
        Unicode::snprintf(tempBuffer, 20, "%d", calibration_rlu_atp1_value);
        update_text_buffer(rlu_atp_value_textBuffer, tempBuffer, RLU_ATP_VALUE_TEXT_SIZE, rlu_atp_value_text);

        //  Swap the X and Y positions of the two buttons
        update_button_position(read_calibration_step_flex_button, upper_button_x, upper_button_y);
        update_button_position(proceed_flex_button, bottom_button_x, bottom_button_y);

        update_button_state(proceed_flex_button, true, true);
        update_button_state(read_calibration_step_flex_button, false, true);
    }
}

Thanks a lot in advance

[GaetanGodart · Accepted solution]

Hello @JPabl.1 ,

You should not use wait() when you want to delay or use timing in TouchGFX.
Instead, use the function HandleTickEvent() that get's called every tick (60 ticks per second by default).

Please find attached an example of what you seems to want to achieve.
When clicking on the button, a progress bar appears and slowly goes from 0% to 100% over 10 seconds.

I hope this  helps! :smiling_face_with_smiling_eyes:
If this comment answers your question, I invite you to select it as "best answer".

Regards,