Adding button functionalities to costum keyboard TOUCHGFX

[Giovanni Cambareri]

Hi, I've created a custom keyboard and so far all works good. I've just a problem: I want to use an OK button on the keyboard to copy the text edited to a text area in an other screen. I'm able to go to the other screen but when i do the second part of my goal, I've got errors. I think the problem is in the function getBuffer.

-This is the part in customkeyboard.cpp

void CustomKeyboard::okPressedHandler()

{

getBuffer(); // function to save the actual entered text

application().gotoScreen01ScreenNoTransition(); // if i use only this line the code work to change screeen

}

-Part in customkeyboard.hpp

virtual void getBuffer()

{

// implemented in screen02_00View.cpp

}

-Part in the screen where the keyboard is defined

extern Unicode::UnicodeChar keyboardBuffer[10];

void Screen02_00View::getBuffer() // added to manage the entered text from temperature keyboard

{

Unicode::UnicodeChar* buff = keyboard.getBuffer();

Unicode::strncpy(keyboardBuffer, buff, Unicode::strlen(buff) + 1);

} 

-Part in screen.hpp

virtual void getBuffer(); //added to manage the keyboard entered text

-Part in the screen where I want to go when i pressed ok button and where i want to save the text edited

Unicode::UnicodeChar keyboardBuffer[10]; // at the beginning of the code

void Screen01View::updateScreen() // I've defined updateScreen from touchGFX

{

if(Unicode::strlen(keyboardBuffer) > 0)

{

memset(&BakeText3Buffer, 0, BAKETEXT3_SIZE);

Unicode::strncpy(BakeText3Buffer, keyboardBuffer, BAKETEXT3_SIZE - 1);

BakeText3Buffer[BAKETEXT3_SIZE-1] = '\0'; // make sure last index is null

BakeText3.invalidate();

}

}

Part in the screen01.hpp

virtual void updateScreen();

Could you please help me?

Thank you

This is my keyboard:

[MM..1]

I see more as one bad idea in your code.

Unicode::UnicodeChar* buff = keyboard.getBuffer(); this try return pointer from void function and too empty function ???

void CustomKeyboard::okPressedHandler()

{

getBuffer(); this call member empty not screen func

[Alexandre RENOUX]

Hello GCamb2,

Could you provide the errors you got ? This would be helpful to assess the issue.

In the future, I believe it is good practice to include the errors to your post in order for the community to be able to support you the best we can.

/Alexandre

[Giovanni Cambareri]

Yes sure, these are the first time I use the community so any advice can be useful.

The error is the following:

TouchGFX/build/STM32F746-DISCO/TouchGFX/gui/src/screen02_00_screen/Screen02_00View.o: In function `Screen02_00View::getBuffer()':

   /TouchGFX/gui/src/screen02_00_screen/Screen02_00View.cpp:28: undefined reference to `CustomKeyboard::getBuffer()'

    collect2.exe: error: ld returned 1 exit status

    make[2]: *** [TouchGFX/build/bin/target.elf] Error 1

    gcc/Makefile:289: recipe for target 'TouchGFX/build/bin/target.elf' failed

    gcc/Makefile:285: recipe for target 'generate_assets' failed

    make[1]: *** [generate_assets] Error 2

    ../gcc/Makefile:47: recipe for target 'all' failed

    make: *** [all] Error 2

    Failed

  Failed

Thanks

[Alexandre RENOUX · Accepted solution]

As the error mentions, CustomKeyboard::getBuffer() is undefined. It is because CustomKeyboard does not have the getBuffer() function. It's the Keyboard class that has it, not CustomKeyboard 😉 CustomKeyboard does not inherit from the Keyboard class but only has a Keyboard object as an attribute.

So you need to define a getBuffer() function in your CustomKeyboard class to be able to call it from your ScreenView.

Something like :

Unicode::UnicodeChar* CustomKeyboard::getBuffer()
{
  return keyboard.getBuffer();
}

Don't forget to declare it in the .hpp file as well.

The fact that both your CustomKeyboard and Keyboard variable have the same name is misleading. I suggest you to change your CustomKeyboard variable name to customKeyboard to avoid mixing them.

When your question is answered, please close this topic by choosing Select as Best.

/Alexandre

[MM..1]

Or maybe you can on invoke keyboard assign directly BakeText3Buffer to keyboard. Then only need in ok click use if empty and invalíidate text...

Noone of getBuffer chaos.