src/apps/haikudepot/edits_generic/CompoundEdit.cpp

   1 /*
   2  * Copyright 2006-2112, Stephan Aßmus <superstippi@gmx.de>
   3  * Distributed under the terms of the MIT License.
   4  */
   5
   6 #include "CompoundEdit.h"
   7
   8 #include <stdio.h>
   9
  10
  11 CompoundEdit::CompoundEdit(const char* name)
  12         : UndoableEdit()
  13         , fEdits()
  14         , fName(name)
  15 {
  16 }
  17
  18
  19 CompoundEdit::~CompoundEdit()
  20 {
  21 }
  22
  23
  24 status_t
  25 CompoundEdit::InitCheck()
  26 {
  27         return B_OK;
  28 }
  29
  30
  31 status_t
  32 CompoundEdit::Perform(EditContext& context)
  33 {
  34         status_t status = B_OK;
  35
  36         int32 count = fEdits.CountItems();
  37         int32 i = 0;
  38         for (; i < count; i++) {
  39                 status = fEdits.ItemAtFast(i)->Perform(context);
  40                 if (status != B_OK)
  41                         break;
  42         }
  43
  44         if (status != B_OK) {
  45                 // roll back
  46                 i--;
  47                 for (; i >= 0; i--) {
  48                         fEdits.ItemAtFast(i)->Undo(context);
  49                 }
  50         }
  51
  52         return status;
  53 }
  54
  55
  56 status_t
  57 CompoundEdit::Undo(EditContext& context)
  58 {
  59         status_t status = B_OK;
  60
  61         int32 count = fEdits.CountItems();
  62         int32 i = count - 1;
  63         for (; i >= 0; i--) {
  64                 status = fEdits.ItemAtFast(i)->Undo(context);
  65                 if (status != B_OK)
  66                         break;
  67         }
  68
  69         if (status != B_OK) {
  70                 // roll back
  71                 i++;
  72                 for (; i < count; i++) {
  73                         fEdits.ItemAtFast(i)->Redo(context);
  74                 }
  75         }
  76
  77         return status;
  78 }
  79
  80
  81 status_t
  82 CompoundEdit::Redo(EditContext& context)
  83 {
  84         status_t status = B_OK;
  85
  86         int32 count = fEdits.CountItems();
  87         int32 i = 0;
  88         for (; i < count; i++) {
  89                 status = fEdits.ItemAtFast(i)->Redo(context);
  90                 if (status != B_OK)
  91                         break;
  92         }
  93
  94         if (status != B_OK) {
  95                 // roll back
  96                 i--;
  97                 for (; i >= 0; i--) {
  98                         fEdits.ItemAtFast(i)->Undo(context);
  99                 }
 100         }
 101
 102         return status;
 103 }
 104
 105
 106 void
 107 CompoundEdit::GetName(BString& name)
 108 {
 109         name << fName;
 110 }
 111
 112
 113 bool
 114 CompoundEdit::AppendEdit(const UndoableEditRef& edit)
 115 {
 116         return fEdits.Add(edit);
 117 }