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if not Assigned(AOwner) then
raise Exception.Create(''''AOwner is nil In TYuNode.Create'''');
FOwner := AOwner;
FUpLeft := nil;
FUpRight := nil;
FDownLeft := nil;
FDownRight := nil;
FDeleting := False;
FIsRootOfDeleted := False;
end;
destructor TYuNode.Destroy;
var
SubNode, WillDeleteNode: TYuNode;
begin
FDeleting := True;
if FIsRootOfDeleted then //维护指针
CutFromTree;
SubNode := GetFirstChild;
while SubNode <> nil do
begin
WillDeleteNode := SubNode;
SubNode := SubNode.GetNextBrother;
WillDeleteNode.Free;
end;
inherited;
end;
function TYuNode.GetFirstChild: TYuNode;
begin
Result := FDownLeft;
end;
function TYuNode.GetFirstBrother: TYuNode;
begin
Result := Self;
while Result.GetPrevBrother <> nil do
Result := Result.GetPrevBrother;
end;
function TYuNode.GetLastBrother: TYuNode;
begin
Result := Self;
while Result.GetNextBrother <> nil do
Result := Result.GetNextBrother;
end;
function TYuNode.GetLastChild: TYuNode;
begin
Result := FDownLeft;
if Result = nil then Exit;
while Result.FDownRight <> nil do
Result := Result.FDownRight;
end;
function TYuNode.GetLevel: Integer;
var
Node: TYuNode;
begin
Node := Self;
Result := -1;
repeat
Node := Node.Parent;
Inc(Result);
until Node = nil;
end;
function TYuNode.GetNext: TYuNode;
var
Node: TYuNode;
begin
//1.查看第一个子结点
Result := GetFirstChild;
//2.如果第1步不成功，查看下一个兄弟
if Result = nil then
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