How to Instantiate a TouchGFX object dynamically?

[amirparto]

Hi, I use TouchGFX in my HMI project, I want to create an instance of an object (ig. a button) in runtime (dynamically), so I could destroy it later and free it's allocation memory.

I tried create it in a method but it seems to have runtime error:

void Screen1View::create_button()
{
	touchgfx::Button button1;
	button1.setXY(0, 0);
	button1.setBitmaps(touchgfx::Bitmap(BITMAP_BLUE_BUTTONS_ROUND_EDGE_SMALL_ID), 
        touchgfx::Bitmap(BITMAP_BLUE_BUTTONS_ROUND_EDGE_SMALL_PRESSED_ID));
 
	add(button1);
 
	button1.invalidate();
}

 

Does anyone have any solution?

[scottSD · Accepted solution]

To my knowledge it can't be done. I asked about this a while back and i believe the answer has something to do with the way TouchGFX is configured.

You will need to place the declaration of that button in your class header file and it should work fine.

Here is @Martin KJELDSEN​  's explanation on this in the following thread:

https://community.st.com/s/question/0D50X0000AVS2tcSQD/is-it-possible-to-dynamically-add-guiobjects

[scottSD]

Another thread on it:

https://community.st.com/s/question/0D53W00000NAV3YSAX/i-want-to-add-a-box-dynamically-on-a-button-click-in-the-buttoncallbackhandler-function

[amirparto]

Thanks. It helped a lot.