C++ Differentiating Key Press vs Key Release

Question

I'm currently listening to keyboard inputs through a getch() while loop and everything is working great. However, if I'm holding left and press up, then the left movement is stopped until I press it again. The only way I can think of solving this requires knowing if a key is being held / when it is released. I'm using ncurses which supposedly has this ability, but through all my searches I haven't found anything useful.

Tetris Code Snippet in Question:

int ch = getch();
while(ch != 'x') {
   // Handle arrow keys first
   if (ch == '\033') {
      getch(); // Get rid of slash
      switch (getch()) {
         case 'A': rotate();    redraw(); break; // Up
         case 'B': move(DOWN);  redraw(); break; // Down
         case 'C': move(RIGHT); redraw(); break; // Right
         case 'D': move(LEFT);  redraw(); break; // Left
      }
   } else {
      switch(ch) {
        // Stuff not relevant to this question
      }
   }
   ch = getch();
}

Answer 1

This problem is more complicated than you think. It's called keyboard ghosting. To make sure multiple keys work when pressed simultaneously,you may need to have a specialized keyboard that provides anti-ghosting feature, or you may have to remap the Keyboard as per this article. Read it here for more detailed information.