Presenter with Timer

/*

• Copyright (c) 2013 contributors (see below)
• Released under the GNU GPL v3
• -------------------------------------------
• This program is free software: you can redistribute it and/or modify
• it under the terms of the GNU General Public License as published by
• the Free Software Foundation, either version 3 of the License, or
• (at your option) any later version.
• This program is distributed in the hope that it will be useful,
• but WITHOUT ANY WARRANTY; without even the implied warranty of
• MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
• GNU General Public License for more details.
• You should have received a copy of the GNU General Public License
• along with this program. If not, see <http://www.gnu.org/licenses/>.
• All scripts must maintain this copyrite information, including the contributer information listed
• As mentioned, this script has been licensed under GPL 3.0
• Basically, that means, you are free to use the script, commercially etc, but if you include
• it in your objects, you must make the source viewable to the person you are distributuing it to -
• ie: it can not be closed source - GPL 3.0 means - you must make it open!
• This is so that others can modify it and contribute back to the community.
• Enjoy!
• This script can be found on git hub: https://github.com/firecentaur/lsl-scripts
• Contributors:
• Paul Preibisch (fire@b3dmultitech.com)
• DESCRIPTION
• Hi everyone, I hope this script helps you for your Virtual World Presentations!
• To use, simply place this script into an Opensim Primitive Object, along with your textures.
• Once clicked, you will get a menu that allows you to:
• RESET - resets the scripts
• Set Timer - Set a timer (in seconds) and start the timer to automatically advance the slides
• Start Timer - Start the timer if it is stopped
• Stop Timer - Stop the timer if it is currently started
• Next - advance to next slide
• Previous - go to previous slide
• lock/unlock - lock/unlock the presenter so only the owner can use
• Messages on / Messags off - turn messages on or off to give textual feedback to all users when moving to a new slide etc
• /

list textures; integer total_items; integer random_integer ( integer min , integer max ){

   return min + (integer )( llFrand( max - min + 1 ) );

} integer MENU_CHANNEL; integer TEXT_BOX_CHANNEL; integer LOCK=TRUE; string timer_status="off"; integer SLIDE_DELAY=10; integer SILENT=TRUE; integer current_slide=0; integer slide_timer_counter=0; vector RED =<1.00000, 0.00000, 0.00000>; vector ORANGE=<1.00000, 0.43763, 0.02414>; vector YELLOW=<1.00000, 1.00000, 0.00000>; vector GREEN=<0.00000, 1.00000, 0.00000>; vector BLUE=<0.00000, 0.00000, 1.00000>; vector BABYBLUE=<0.00000, 1.00000, 1.00000>; vector PINK=<1.00000, 0.00000, 1.00000>; vector PURPLE=<0.57338, 0.25486, 1.00000>; vector BLACK= <0.00000, 0.00000, 0.00000>; vector WHITE= <1.00000, 1.00000, 1.00000>;

update_inventory(){

   integer index=0;
   total_items = llGetInventoryNumber(INVENTORY_TEXTURE);
   while (index < total_items){
               string item_name= llGetInventoryName(INVENTORY_TEXTURE, index);
              
                textures+=item_name;
                llInstantMessage(llGetOwner(), "Adding "+item_name+" to the presentation.");
               ++index;
           }
           if (total_items!=0){
               llSetTexture(llList2String(textures, current_slide), ALL_SIDES);
           }

} menu(key user_key){

           if (user_key==llGetOwner()){
               list timer_option;
               list menu_options;
               list lock_option;
               list silent_option;
               if (timer_status=="on"){
                   timer_option=["Stop Timer"];
               }else{
                   timer_option=["Start Timer"];
               }
               if (LOCK==FALSE){
                   lock_option=["lock"];    
               }else{
                   lock_option=["unlock"];
               }
               if (SILENT==FALSE){
                   silent_option=["Messages on"];    
               }else{
                   silent_option=["Messages off"];
               }
               menu_options = ["Reset","Set Timer"]+ timer_option+ ["Next", "Previous"]+lock_option+silent_option;
               llDialog(user_key, "Slide "+(string)(current_slide+1)+" of "+(string)llGetListLength(textures)+". Please select an option", menu_options,MENU_CHANNEL);
           }
           else{
               if (LOCK==FALSE){
                   llDialog(user_key, "Please select an option", ["Next","Previous"],MENU_CHANNEL);
               }else{
                   llDialog(user_key, "Sorry, only "+(string)llKey2Name(llGetOwner())+" is allowed to control this presenter", ["Ok"],MENU_CHANNEL);
               }
           }

} next_slide(key user_key){

       current_slide++;
       if (current_slide>llGetListLength(textures)-1){                
           current_slide=0;
       }
       if (SILENT==FALSE){
           //say to all users
           llSay(0,"Advancing to slide "+(string)(current_slide+1));
       }else{
           //say only to user who pressed
           if (user_key!=NULL_KEY){
               llInstantMessage(user_key, "Going to slide "+(string)(current_slide+1));
           }
       }
       llSetTexture(llList2String(textures, current_slide), ALL_SIDES);

} prev_slide(key user_key){

       current_slide--;
       if (current_slide<0){                
           current_slide=llGetListLength(textures)-1;
       }
       if (SILENT==FALSE){
                   //say to all users 
                   llInstantMessage(user_key, "Going to slide "+(string)(current_slide+1));
       }else
           //say only to user who pressed
           if (user_key!=NULL_KEY){
               llInstantMessage(user_key, "Going to slide "+(string)(current_slide+1));
           }
       
       llSetTexture(llList2String(textures, current_slide), ALL_SIDES);

} default {

   state_entry() {
       llSetText("", RED, 1);
       MENU_CHANNEL=random_integer(-900000-30,000);
       TEXT_BOX_CHANNEL=random_integer(-1900000,-900000);
       llListen(MENU_CHANNEL, "", "", ""); 
       llListen(TEXT_BOX_CHANNEL, "", "", "");
       update_inventory();
       
       
   }
   touch_start(integer num_detected) {
       integer n;
       
       for (n=0;n<num_detected;n++){
           menu(llDetectedKey(n));
           
       }
   }
   listen(integer channel, string name, key user_key, string command) {
       
       if (channel==MENU_CHANNEL){
           if (command=="Reset"){
               llShout(0,"Reseting Presenter"); 
               llResetScript();
           }else
           if (command=="lock"){
               if (user_key!=llGetOwner()){
                   llSay(0,"Sorry, only "+llKey2Name(llGetOwner())+" is allowed to lock the presenter.");
                   return;
               }//only allow owner to control if presenter is locked
               LOCK = TRUE;
               llInstantMessage(user_key, "Presenter locked.");
           }else
           if (command=="unlock"){
               if (user_key!=llGetOwner()){
                   llSay(0,"Sorry, only "+llKey2Name(llGetOwner())+" is allowed to lock the presenter.");
                   return;
               }//only allow owner to control if presenter is locked
               LOCK = FALSE;
               llInstantMessage(user_key, "Presenter unlocked.");
           }else
           if (command=="Messages off"){
               if (user_key!=llGetOwner()){
                   llSay(0,"Sorry, only "+llKey2Name(llGetOwner())+" is allowed to turn messages off.");
                   return;
               }//only allow owner to control if presenter is locked
               SILENT = TRUE;
               llInstantMessage(user_key, "Messages off.");
           }else
           if (command=="lock"){
                   if (user_key!=llGetOwner()){
                   llSay(0,"Sorry, only "+llKey2Name(llGetOwner())+" is allowed to turn messages on.");
                   return;
               }//only allow owner to control if presenter is locked
               SILENT = FALSE;
               llInstantMessage(user_key, "Messages on.");
           }else
           if (command=="Set Timer"){
               if (user_key!=llGetOwner()){return;}//only allow owner to control
               //http://wiki.secondlife.com/wiki/LlTextBox
               llTextBox( user_key, "Please enter the time in seconds", TEXT_BOX_CHANNEL);
           }else
           if (command=="Start Timer"){
               if (user_key!=llGetOwner()&&LOCK==TRUE){return;}//only allow owner to control if presenter is locked
               llSetTimerEvent(1);
               timer_status="on";
               llInstantMessage(user_key, "Time started");
           }else
           if (command=="Stop Timer"){
               if (user_key!=llGetOwner()&&LOCK==TRUE){return;}//only allow owner to control if presenter is locked
               llSetTimerEvent(0);
               timer_status="off";
               llInstantMessage(user_key, "Timer stopped");
           }else
           if (command=="Previous"){
               
               if (user_key!=llGetOwner()&&LOCK==TRUE){//only allow owner to control if presenter is locked
                   llSay(0,"Sorry, only "+llKey2Name(llGetOwner())+" is allowed to change the slides.");
                   return;
               }
               prev_slide(user_key);
           }else
           if (command=="Next"){
               if (user_key!=llGetOwner()&&LOCK==TRUE){
                   llSay(0,"Sorry, only "+llKey2Name(llGetOwner())+" is allowed to change the slides.");
               return;
               }
               next_slide(user_key);
               
           }
       }else if (channel==TEXT_BOX_CHANNEL){
           if (user_key!=llGetOwner()){
               llInstantMessage(user_key,"Sorry, only "+llKey2Name(llGetOwner())+" change the timer.");
               return;
           }
           SLIDE_DELAY=(integer)command;
           if (SLIDE_DELAY==0){
               llSetTimerEvent(0);
               timer_status="off";
               llInstantMessage(user_key,"Slideshow stopped");
               llSetText("", RED, 1);
           }else{
               llInstantMessage(user_key,"Slide delay set to "+(string)SLIDE_DELAY);
               timer_status="on";
               llSetTimerEvent(1);
           }
       }
           menu(user_key);
   }
   timer() {
       
       slide_timer_counter++;
       if ((SLIDE_DELAY-slide_timer_counter)<0){
           slide_timer_counter=0;
           next_slide(NULL_KEY);
       }
        llSetText("Time before next slide: "+(string)(SLIDE_DELAY-slide_timer_counter), RED, 1);
       
   }
    changed(integer change)
   {
       // Was it an inventory change?
       if ((change & CHANGED_INVENTORY) == CHANGED_INVENTORY) {
           update_inventory();
       }
   }

}