LoadButton_Script.txt

string index="1";
integer listenHandle;
vector pos=ZERO_VECTOR;
vector foc=ZERO_VECTOR;
integer active= FALSE;
integer perm;

//Method to check permission
integer checkPerm() {
    perm = llGetPermissions();
    if(perm & PERMISSION_CONTROL_CAMERA && perm & PERMISSION_TRACK_CAMERA ) {
        return TRUE;
    } else {
        llOwnerSay("Camera permission not granted. Retrying to request permission.");
        llRequestPermissions(llGetOwner(), PERMISSION_CONTROL_CAMERA | PERMISSION_TRACK_CAMERA);
        return checkPerm();
    }
}

default
{
    state_entry()
    {
        llSetTexture(index, ALL_SIDES);  
        llRequestPermissions(llGetOwner(), PERMISSION_CONTROL_CAMERA | PERMISSION_TRACK_CAMERA);
        listenHandle = llListen(((integer) ("0x" + llGetSubString ((string) llGetOwner(), -8, -1)) | 0x80000000 ), "", "","");
    }

    touch_start(integer total_number)
    {
        //Check if pos saved or not
        if (pos==ZERO_VECTOR) {
            llOwnerSay("Position "+index+" not saved. Please save a position first.");
        } else {
            perm = llGetPermissions();
            if(checkPerm())
            {
                if(!active) {
                    llOwnerSay("Applying camera position "+index);
                    llClearCameraParams();
                    llSetCameraParams([12,1,17,foc,6,0.0,13,pos,5,0.0,21,1,22,1]);
                    //Notify other buttons that this button is active
                    llRegionSay(((integer) ("0x" + llGetSubString ((string) llGetOwner(), -8, -1)) | 0x80000000 ), "CtrlC");       
                    llSetTexture(index+"_red", ALL_SIDES);  
                    active=TRUE;
                } else {
                    llClearCameraParams();
                    llSetTexture(index, ALL_SIDES);  
                    active=FALSE;
                }
            }  
        } 
    }
    
    listen(integer channel, string name, key id, string message) {
        // Some other button is active
        if (~llSubStringIndex(message, "CtrlC")) {
            llSetTexture(index, ALL_SIDES);
            if (checkPerm()) {
                llClearCameraParams();
                llSetCameraParams([ CAMERA_ACTIVE, FALSE ]);
            }
            active=FALSE;    
        } else if (~llSubStringIndex(message, "SavC"+index)) {
            list vectors = llParseString2List(message,[""],["SavC"+index,"#"]);
            pos= (vector)llList2String(vectors,1);
            foc= (vector)llList2String(vectors,3);
        }
    }
    
    changed(integer change)
    {
        if (change & CHANGED_OWNER)
        {
            llResetScript();
        }
    }
    
    run_time_permissions (integer perms) {
        perm = llGetPermissions();
    }
     
    state_exit()
    {
        llListenRemove(listenHandle);
    }
}