Help with Hotkey device coding.

Projects Programming
1

Hi everyone,
I have a fairly basic level in Arduino programming.
I'm trying to build a device to send hotkeys to my pc with an Arduino Pro Micro, in particular the commands that I often use with some softwares.

For some commands like "undo" (ctrl + z) I was able to easily execute them through simple buttons and the switch...case function.

Here's my question:
in the software I use, to access the 'cut' function faster, I hold down the ctrl key and then use the mouse to choose the point where to cut.
In the code attached here, I can't tell arduino to send and hold ctrl function while the button is pressed and to release the "key" when the button is released.
In the code I wrote, the ctrl key is pressed and never released. Maybe the switch...case is the wrong way?

#include <Keyboard.h>


int keys[] = {2, 3, 4, 5, 6,};

void setup() {
 Keyboard.begin(); // setup keyboard
 pinMode(2, INPUT_PULLUP);
 pinMode(3, INPUT_PULLUP);
 pinMode(4, INPUT_PULLUP);
 pinMode(5, INPUT_PULLUP);
 pinMode(6, INPUT_PULLUP);
 }


void loop() {
 for (int i = 2; i < 7; ++i) {
 // check buttons
 if(readButton(i)) {
 doAction(i); 
 }
 }
}

boolean readButton(int pin) {
 // check and debounce buttons
 if (digitalRead(pin) == LOW) {
 delay(10);
 if (digitalRead(pin) == LOW) {
 return true;
 }
 }
 return false;
}

void doAction(int pin) {
 switch (pin) {
  
//Redo
 case 2:
 Keyboard.press(KEY_LEFT_GUI);
 Keyboard.press(KEY_LEFT_SHIFT);
 Keyboard.press('z');
 delay(100);
 Keyboard.releaseAll();
 break;

//Undo
 case 3:
 Keyboard.press(KEY_LEFT_GUI);
 Keyboard.press('z');
 delay(100);
 Keyboard.releaseAll();
 break;

//zoom out
 case 4:
 Keyboard.press('t');
 delay(200);
 Keyboard.releaseAll();
 break;

//zoom in
 case 5:
 Keyboard.press('r');
 delay(200);
 Keyboard.releaseAll();
 break;

// here's where I need the "Hold cmd" function.
//In this case the hold function is performed but the key is never released.
 case 6:
 Keyboard.press(KEY_LEFT_GUI);
 delay(10);
 break;
 }

 }

Surely there is a very simple way of solving the problem, but at the moment I don't see it.

Thanks in advance to anyone who will help me.

Ettore.