Delphi中的非字母排序 [英] Non alphabetic sort in Delphi

问题描述

我正在尝试按特定的顺序对TStringList进行排序.

I'm trying to sort a TStringList in an especific order.

而不是A，B，C.我正尝试在B，C，A中订购它.

Instead of A,B,C.. I'm trying to order it in B,C,A.

我已经按照需要的顺序声明了一个const数组.

I've declarated a const array with the order that I need.

我已经尝试过使用CustomSorte，但是我不明白如何编写该函数.

I've tried with CustomSorte, but I can't understand how to write the function.

我现在正在尝试for循环，但这真的很难而且令人困惑！

I'm trying with for loops now, but it is going really hard and confusing!

我不是Delphi专家...

I'm not a Delphi Expert...

谢谢你们！

推荐答案

从有关TStringListSortCompare函数类型的帮助中:

From the help about the TStringListSortCompare function type:

Index1和Index2是要比较的List中项目的索引. 回调返回:

Index1 and Index2 are indexes of the items in List to compare. The callback returns:

• 如果Index1标识的字符串位于Index2标识的字符串之前，则该值小于0
• 如果两个字符串相等，则为0
• 如果带有Index1的字符串位于由Index2标识的字符串之后，则该值大于0.

• a value less than 0 if the string identified by Index1 comes before the string identified by Index2
• 0 if the two strings are equivalent
• a value greater than 0 if the string with Index1 comes after the string identified by Index2.

因此，如果您从第一个商品的自定义订单中减去第二个商品的自定义订单，那么这些商品将按照您的意愿进行排序.

So if you subtract your custom order of the second item from the custom order of the first one, then the items will be sorted like you want.

const
  Order: array[0..6] of String = ('B', 'C', 'A', 'D', 'G', 'F', 'E');

function GetStringOrder(const S: String; CaseSensitive: Boolean): Integer;
begin
  for Result := 0 to Length(Order) - 1 do
    if (CaseSensitive and (CompareStr(Order[Result], S) = 0)) or
        (not CaseSensitive and (CompareText(Order[Result], S) = 0)) then
      Exit;
  Result := Length(Order);
end;

function MyCompareStrings(List: TStringList; Index1, Index2: Integer): Integer;
begin
  Result := GetStringOrder(List[Index1], List.CaseSensitive) -
    GetStringOrder(List[Index2], List.CaseSensitive);
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  List: TStringList;
begin
  List := TStringList.Create;
  try
    List.CommaText := 'A,G,a,C,B,b,F,a,B,C,c,D,d,E,D,F,G,C,A,G,d,e,f,g';
    List.CaseSensitive := True;
    List.CustomSort(MyCompareStrings);
    ListBox1.Items.Assign(List);
  finally
    List.Free;
  end;
end;

这篇关于Delphi中的非字母排序的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！