hvirtual/cinelerra/undostack.C

   1 #include "stringfile.h"
   2 #include "undostack.h"
   3 #include <string.h>
   4
   5 UndoStack::UndoStack() : List<UndoStackItem>()
   6 {
   7         current = 0;
   8 }
   9
  10 UndoStack::~UndoStack()
  11 {
  12 }
  13
  14 UndoStackItem* UndoStack::push()
  15 {
  16 // current is only 0 if before first undo
  17         if(current)
  18                 current = insert_after(current);
  19         else
  20                 current = insert_before(first);
  21
  22 // delete future undos if necessary
  23         if(current && current->next)
  24         {
  25                 while(current->next) remove(last);
  26         }
  27
  28 // delete oldest undo if necessary
  29         if(total() > UNDOLEVELS) remove(first);
  30
  31         return current;
  32 }
  33
  34 int UndoStack::pull()
  35 {
  36         if(current) current = PREVIOUS;
  37 }
  38
  39 UndoStackItem* UndoStack::pull_next()
  40 {
  41 // use first entry if none
  42         if(!current) current = first;
  43         else
  44 // use next entry if there is a next entry
  45         if(current->next)
  46                 current = NEXT;
  47 // don't change current if there is no next entry
  48         else
  49                 return 0;
  50
  51         return current;
  52 }
  53
  54
  55
  56
  57
  58
  59
  60 UndoStackItem::UndoStackItem() : ListItem<UndoStackItem>()
  61 {
  62         description = type = data_after = data_before = 0;
  63 }
  64
  65 UndoStackItem::~UndoStackItem()
  66 {
  67         if(description) delete [] description;
  68         if(type) delete [] type;
  69         if(data_after) delete [] data_after;
  70         if(data_before) delete [] data_before;
  71 }
  72
  73 int UndoStackItem::set_description(char *description)
  74 {
  75         this->description = new char[strlen(description) + 1];
  76         strcpy(this->description, description);
  77 }
  78
  79 int UndoStackItem::set_type(char *type)
  80 {
  81         this->type = new char[strlen(type) + 1];
  82         strcpy(this->type, type);
  83 }
  84
  85 int UndoStackItem::set_data_before(char *data)
  86 {
  87         this->data_before = new char[strlen(data) + 1];
  88         strcpy(this->data_before, data);
  89 }
  90
  91 int UndoStackItem::set_data_after(char *data)
  92 {
  93         this->data_after = new char[strlen(data) + 1];
  94         strcpy(this->data_after, data);
  95 }