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NeXTSTEP 3.0
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AppKit
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Draw
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graphicsUndo.subproj
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MoveGraphicsChange.m
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1992-02-09
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#import "drawundo.h"
@interface MoveGraphicsChange(PrivateMethods)
- (BOOL)subsumeIdenticalChange:change;
@end
@implementation MoveGraphicsChange
- initGraphicView:aGraphicView vector:(const NXPoint *)aVector
{
[super initGraphicView:aGraphicView];
redoVector.x = aVector->x;
redoVector.y = aVector->y;
undoVector.x = -redoVector.x;
undoVector.y = -redoVector.y;
return self;
}
- (const char *)changeName
{
return NXLocalStringFromTable("Operations", "Move", NULL, "The operation of moving a graphical entity.");
}
- changeDetailClass
{
return [MoveChangeDetail class];
}
- (const NXPoint *)undoVector
{
return &undoVector;
}
- (const NXPoint *)redoVector
{
return &redoVector;
}
- (BOOL)subsumeIdenticalChange:change
{
MoveGraphicsChange *moveChange;
moveChange = (MoveGraphicsChange *)change;
undoVector.x += moveChange->undoVector.x;
undoVector.y += moveChange->undoVector.y;
redoVector.x += moveChange->redoVector.x;
redoVector.y += moveChange->redoVector.y;
return YES;
}
@end