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C/C++ Source or Header  |  1996-03-18  |  5.3 KB  |  302 lines
  1. /*
  2. **    PickScreen.c
  3. **
  4. **    Simplified public screen selection routine
  5. **
  6. **    Copyright © 1990-1996 by Olaf `Olsen' Barthel
  7. **        All Rights Reserved
  8. */
  9.  
  10. #ifndef _GLOBAL_H
  11. #include "Global.h"
  12. #endif
  13.  
  14. enum    {    GAD_LIST=1,GAD_USE,GAD_CANCEL };
  15.  
  16.     /* BuildScreenList():
  17.      *
  18.      *    Build a private copy of the public screen list.
  19.      */
  20.  
  21. STATIC struct List *
  22. BuildScreenList(VOID)
  23. {
  24.     struct List *List,*PubScreenList;
  25.  
  26.         /* Get the list body. */
  27.  
  28.     if(List = (struct List *)AllocVecPooled(sizeof(struct List),MEMF_ANY))
  29.     {
  30.         NewList(List);
  31.  
  32.             /* Get access to the public screen list. */
  33.  
  34.         if(PubScreenList = LockPubScreenList())
  35.         {
  36.             struct Node *Next,*Node;
  37.  
  38.             Node = PubScreenList -> lh_Head;
  39.  
  40.                 /* Scan the list. */
  41.  
  42.             while(Next = Node -> ln_Succ)
  43.             {
  44.                     /* Don't include the current `term' public
  45.                      * screen name in it.
  46.                      */
  47.  
  48.                 if(strcmp(Node -> ln_Name,TermIDString))
  49.                 {
  50.                     struct Node *New = CreateNode(Node -> ln_Name);
  51.  
  52.                         /* Got a new node? */
  53.  
  54.                     if(New)
  55.                         AddTail(List,New);
  56.                 }
  57.  
  58.                 Node = Next;
  59.             }
  60.  
  61.             UnlockPubScreenList();
  62.         }
  63.  
  64.             /* In case the list happens to remain empty,
  65.              * include the Workbench screen in it.
  66.              */
  67.  
  68.         if(!List -> lh_Head -> ln_Succ)
  69.         {
  70.             struct Node *New = CreateNode("Workbench");
  71.  
  72.             if(New)
  73.                 AddTail(List,New);
  74.             else
  75.             {
  76.                 FreeVecPooled(List);
  77.  
  78.                 List = NULL;
  79.             }
  80.         }
  81.     }
  82.  
  83.     return(List);
  84. }
  85.  
  86.     /* PickScreen(STRPTR Name):
  87.      *
  88.      *    Your nice public screen selection routine.
  89.      */
  90.  
  91. BOOL
  92. PickScreen(struct Window *Window,STRPTR Name)
  93. {
  94.     struct List    *ScreenList;
  95.     BOOL         Result = FALSE;
  96.  
  97.     if(ScreenList = BuildScreenList())
  98.     {
  99.         struct LayoutHandle *Handle;
  100.  
  101.         if(Handle = LT_CreateHandleTags(Window -> WScreen,
  102.             LH_LocaleHook,    &LocaleHook,
  103.         TAG_DONE))
  104.         {
  105.             struct Window    *PanelWindow;
  106.             ULONG         Index = (ULONG)~0,i;
  107.             struct Node    *Node;
  108.             LONG         MaxWidth,MaxHeight,Len;
  109.  
  110.             MaxWidth = MaxHeight = 0;
  111.  
  112.             for(Node = ScreenList -> lh_Head, i = 0 ; Node -> ln_Succ ; Node = Node -> ln_Succ, i++)
  113.             {
  114.                 if(!Stricmp(Node -> ln_Name,Name))
  115.                     Index = i;
  116.  
  117.                 Len = strlen(Node -> ln_Name);
  118.  
  119.                 if(Len > MaxWidth)
  120.                     MaxWidth = Len;
  121.  
  122.                 MaxHeight++;
  123.             }
  124.  
  125.             if(MaxWidth < 30)
  126.                 MaxWidth = 30;
  127.  
  128.             if(MaxHeight < 5)
  129.                 MaxHeight = 5;
  130.             else
  131.             {
  132.                 if(MaxHeight > 20)
  133.                     MaxHeight = 20;
  134.             }
  135.  
  136.             LT_New(Handle,
  137.                 LA_Type,    VERTICAL_KIND,
  138.             TAG_DONE);
  139.             {
  140.                 LT_New(Handle,
  141.                     LA_Type,    VERTICAL_KIND,
  142.                 TAG_DONE);
  143.                 {
  144.                     LT_New(Handle,
  145.                         LA_Type,    LISTVIEW_KIND,
  146.                         LA_Chars,    30,
  147.                         LA_ID,        GAD_LIST,
  148.                         LA_Lines,    5,
  149.                         LALV_MaxGrowX,    MaxWidth,
  150.                         LALV_MaxGrowY,    MaxHeight,
  151.                         LALV_ResizeY,    TRUE,
  152.                         GTLV_Labels,    ScreenList,
  153.                         GTLV_Selected,    Index,
  154.                         LALV_Link,    NIL_LINK,
  155.                         LALV_CursorKey,    TRUE,
  156.                     TAG_DONE);
  157.  
  158.                     LT_EndGroup(Handle);
  159.                 }
  160.  
  161.                 LT_New(Handle,
  162.                     LA_Type,VERTICAL_KIND,
  163.                 TAG_DONE);
  164.                 {
  165.                     LT_New(Handle,
  166.                         LA_Type,    XBAR_KIND,
  167.                         LAXB_FullSize,    TRUE,
  168.                     TAG_DONE);
  169.  
  170.                     LT_EndGroup(Handle);
  171.                 }
  172.  
  173.                 LT_New(Handle,LA_Type,HORIZONTAL_KIND,
  174.                     LAGR_SameSize,    TRUE,
  175.                     LAGR_Spread,    TRUE,
  176.                 TAG_DONE);
  177.                 {
  178.                     LT_New(Handle,
  179.                         LA_Type,    BUTTON_KIND,
  180.                         LA_LabelID,    MSG_GLOBAL_USE_GAD,
  181.                         LA_ID,        GAD_USE,
  182.                         LABT_ReturnKey,    TRUE,
  183.                         LABT_ExtraFat,    TRUE,
  184.                     TAG_DONE);
  185.  
  186.                     LT_New(Handle,
  187.                         LA_Type,    BUTTON_KIND,
  188.                         LA_LabelID,    MSG_GLOBAL_CANCEL_GAD,
  189.                         LA_ID,        GAD_CANCEL,
  190.                         LABT_EscKey,    TRUE,
  191.                         LABT_ExtraFat,    TRUE,
  192.                     TAG_DONE);
  193.  
  194.                     LT_EndGroup(Handle);
  195.                 }
  196.  
  197.                 LT_EndGroup(Handle);
  198.             }
  199.  
  200.             if(PanelWindow = LT_Build(Handle,
  201.                 LAWN_TitleID,        MSG_TERMPICKSCREEN_SCREENS_TXT,
  202.                 LAWN_IDCMP,        IDCMP_CLOSEWINDOW,
  203.                 LAWN_HelpHook,        &GuideHook,
  204.                 LAWN_Parent,        Window,
  205.                 WA_DepthGadget,        TRUE,
  206.                 WA_CloseGadget,        TRUE,
  207.                 WA_DragBar,        TRUE,
  208.                 WA_RMBTrap,        TRUE,
  209.                 WA_Activate,        TRUE,
  210.                 WA_SimpleRefresh,    TRUE,
  211.             TAG_DONE))
  212.             {
  213.                 struct IntuiMessage    *Message;
  214.                 BOOL             Done = FALSE;
  215.                 ULONG             MsgClass;
  216.                 UWORD             MsgCode;
  217.                 struct Gadget        *MsgGadget;
  218.  
  219.                 LT_ShowWindow(Handle,TRUE);
  220.  
  221.                 PushWindow(PanelWindow);
  222.  
  223.                 do
  224.                 {
  225.                     if(Wait(PORTMASK(PanelWindow -> UserPort) | SIG_BREAK) & SIG_BREAK)
  226.                         break;
  227.  
  228.                     while(Message = (struct IntuiMessage *)LT_GetIMsg(Handle))
  229.                     {
  230.                         MsgClass    = Message -> Class;
  231.                         MsgCode        = Message -> Code;
  232.                         MsgGadget    = (struct Gadget *)Message -> IAddress;
  233.  
  234.                         LT_ReplyIMsg(Message);
  235.  
  236.                         if(MsgClass == IDCMP_CLOSEWINDOW)
  237.                             Done = TRUE;
  238.  
  239.                         if(MsgClass == IDCMP_GADGETUP)
  240.                         {
  241.                             switch(MsgGadget -> GadgetID)
  242.                             {
  243.                                 case GAD_USE:
  244.  
  245.                                     if(Index != (ULONG)~0)
  246.                                     {
  247.                                         struct Node *Node = GetListNode(Index,ScreenList);
  248.  
  249.                                         if(Node)
  250.                                         {
  251.                                             strcpy(Name,Node -> ln_Name);
  252.  
  253.                                             Result = TRUE;
  254.                                         }
  255.                                     }
  256.  
  257.                                     Done = TRUE;
  258.                                     break;
  259.  
  260.                                 case GAD_CANCEL:
  261.  
  262.                                     Done = TRUE;
  263.                                     break;
  264.  
  265.                                 case GAD_LIST:
  266.  
  267.                                     Index = MsgCode;
  268.                                     break;
  269.                             }
  270.                         }
  271.  
  272.                         if(MsgClass == IDCMP_IDCMPUPDATE)
  273.                         {
  274.                             struct Node *Node = GetListNode(Index = MsgCode,ScreenList);
  275.  
  276.                             if(Node)
  277.                             {
  278.                                 strcpy(Name,Node -> ln_Name);
  279.  
  280.                                 Done = Result = TRUE;
  281.  
  282.                                 LT_PressButton(Handle,GAD_USE);
  283.                             }
  284.                         }
  285.                     }
  286.                 }
  287.                 while(!Done);
  288.  
  289.                 PopWindow();
  290.             }
  291.  
  292.             LT_DeleteHandle(Handle);
  293.         }
  294.  
  295.         DeleteList(ScreenList);
  296.     }
  297.     else
  298.         DisplayBeep(Window -> WScreen);
  299.  
  300.     return(Result);
  301. }
  302.