OpenGL GLUT left mouse click overrides holding right mouse - c++

Question

I'm adapting some skeleton code to learn how OpenGL works and have in SphericalCameraManipulator.cpp which allows me to pan and tilt the camera while I hold down right mouse:
void SphericalCameraManipulator::handleMouseMotion(int x, int y)
{
//Motion
float xMotion = (float)x - previousMousePosition[0];
float yMotion = (float)y - previousMousePosition[1];
if(reset)
{
xMotion = yMotion = 0.0;
reset = false;
}
this->previousMousePosition[0] = (float)x;
this->previousMousePosition[1] = (float)y;
//Right Button Action
if(this->currentButton == GLUT_RIGHT_BUTTON && this->currentState == GLUT_DOWN)
{
this->pan -= xMotion*this->panTiltMouseStep ;
this->tilt += yMotion*this->panTiltMouseStep ;
}
//Enforce Ranges
this->enforceRanges();
}
I deleted the left mouse action as I don't want it to control the camera, and it now actions a command in the main code body.
//Left Button Action
if(button == GLUT_LEFT_BUTTON && state == GLUT_DOWN)
{
... //game action
}
My problem is that when I click the left mouse, the press of the right mouse is cancelled, and I must release and repress the right mouse to continue controlling the camera.
Is there a way to prevent this from happening? It interrupts the flow of the game. I'm using GLUT

Answer 1

Rabbid76's comment saying there is no mouse hold event set me on the right path.
I wrote a small function that simply recorded the last state of mouse button 2 (the 'camera look around' button):
void SphericalCameraManipulator::handleMouse(int button, int state)
{
this->currentButton = button;
this->currentState = state;
//to enable mouse look around
if (this->currentButton == 2) //right mouse
this->lastLookState = this->currentState;
if(this->currentState == GLUT_UP)
{
reset = true;
}
}
This mean even when the current state was regarding the left mouse button (game action) it was still possiblew to look around since a 'mouse two button up' event had not occured:
this->currentButton = 2;
this->currentState = 1;