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/ NeXTSTEP 3.1 (Developer) [x86] / NeXT Step 3.1 Intel dev.cdr.dmg / NextDeveloper / Examples / AppKit / Draw / graphicsUndo.subproj / DeleteGraphicsChange.m < prev    next >
Text File  |  1992-02-09  |  2KB  |  79 lines
  1. #import "drawundo.h"
  2.  
  3. @interface DeleteGraphicsChange(PrivateMethods)
  4.  
  5. - undoDetails;
  6. - redoDetails;
  7.  
  8. @end
  9.  
  10. @implementation DeleteGraphicsChange
  11.  
  12. - free
  13. {
  14.     if ([self hasBeenDone])
  15.         [graphics freeObjects];
  16.     return [super free];
  17. }
  18.  
  19. - (const char *)changeName
  20. {
  21.     return DELETE_OPERATION;
  22. }
  23.  
  24. - saveBeforeChange
  25. {
  26.     [super saveBeforeChange];
  27.     [changeDetails makeObjectsPerform:@selector(recordGraphicPositionIn:) with:[graphicView graphics]];
  28.  
  29.     return self;
  30. }
  31.  
  32. - undoDetails
  33. {
  34.     int count, i;
  35.     id detail, graphic;
  36.     List *allGraphics;
  37.  
  38.     count = [changeDetails count];
  39.     allGraphics = [graphicView graphics];
  40.     for (i = 0; i < count; i++) {
  41.     detail = [changeDetails objectAt:i];
  42.     graphic = [detail graphic];
  43.         [allGraphics insertObject:graphic at:[detail graphicPosition]];
  44.     [graphic wasAddedTo:graphicView];
  45.     }
  46.     [graphicView getSelection];
  47.     
  48.     return self;
  49. }
  50.  
  51. - redoDetails
  52. {
  53.     int count, i;
  54.     id detail, graphic;
  55.     List *selectedGraphics;
  56.     List *allGraphics;
  57.  
  58.     selectedGraphics = [graphicView selectedGraphics];
  59.     allGraphics = [graphicView graphics];
  60.     count = [changeDetails count];
  61.     for (i = 0; i < count; i++) {
  62.     detail = [changeDetails objectAt:i];
  63.     graphic = [detail graphic];
  64.         [selectedGraphics removeObject:graphic];
  65.         [allGraphics removeObject:graphic];
  66.     [graphic wasRemovedFrom:graphicView];
  67.     }
  68.     [graphicView resetGroupInSlist];
  69.  
  70.     return self;
  71. }
  72.  
  73. - changeDetailClass
  74. {
  75.     return [OrderChangeDetail class];
  76. }
  77.  
  78. @end
  79.