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| ///////////////////////////////////////////////////////////////////////////
// //
// Copyright (c) 2015 by Charta Software B.V. //
// All rights reserved //
// //
// Version: 1.7.0.83525 //
// Web site: https://pascal.chartasoftware.com/ //
// //
// This code and information are provided "as is" without warranty of //
// any kind. Dissemination of this information or reproduction of //
// this material is strictly forbidden unless prior written permission //
// is obtained from Charta Software B.V.. //
// //
///////////////////////////////////////////////////////////////////////////
unit Table.Row.Ordering.Column;
interface
{$SCOPEDENUMS ON}
uses
Boolean,
Collection.List,
Dom.Element,
Integer._32,
Text;
type
TSortOrder = (Ascending, Descending);
TSortColumn = class(TObject)
public
Column: TInteger32;
SortOrder: TSortOrder;
function Copy(): TSortColumn;
end;
TSortColumns = class(TObject)
protected
FSortColumns: TList<TSortColumn>;
function GetColumns(Index: TInteger32): TSortColumn;
function IndexOfColumn(ColumnIndex: TInteger32): TInteger32;
function NegateSortOrder(SortOrder: TSortOrder): TSortOrder;
function SortOrderToText(const Value: TSortOrder): TText;
function TextToSortOrder(const Value: TText): TSortOrder;
function CreateDomElementFromColumn(Column: TSortColumn): TDomElement;
function CreateColumnFromDomElement(Element: TDomElement): TSortColumn;
public
constructor Create(); virtual;
destructor Destroy(); override;
procedure SetSort(Index: TInteger32; SortOrder: TSortOrder);
procedure ToggleSort(Index: TInteger32);
procedure Clear();
function Count(): TInteger32;
function IndexOf(Column: TInteger32): TInteger32;
function IsFirstInSortOrder(Column: TInteger32): TBoolean;
procedure AssignFrom(Source: TSortColumns);
function Copy(): TSortColumns;
procedure ReadFromXml(Element: TDomElement);
procedure WriteToXml(Element: TDomElement);
property Columns[Index: TInteger32]: TSortColumn read GetColumns; default;
end;
implementation
uses
Exception.Enumeration,
Iterator,
Object_.List;
{ TSortColumns }
procedure TSortColumns.SetSort(Index: TInteger32; SortOrder: TSortOrder);
var
ColumnIndex: TInteger32;
SortColumn: TSortColumn;
begin
ColumnIndex := IndexOfColumn(Index);
if ColumnIndex = 0 then
Columns[0].SortOrder := SortOrder
else if ColumnIndex > 0 then
begin
SortColumn := Columns[ColumnIndex];
SortColumn.SortOrder := SortOrder;
FSortColumns.ExtractAt(ColumnIndex);
FSortColumns.AddAt(0, SortColumn);
end
else
begin
SortColumn := TSortColumn.Create();
SortColumn.Column := Index;
SortColumn.SortOrder := SortOrder;
FSortColumns.AddAt(0, SortColumn);
end;
end;
function TSortColumns.SortOrderToText(const Value: TSortOrder): TText;
begin
case Value of
TSortOrder.Ascending:
Result := 'ascending';
TSortOrder.Descending:
Result := 'descending';
else
raise EUnknownEnumerationValue.Create('Unknown order');
end;
end;
function TSortColumns.TextToSortOrder(const Value: TText): TSortOrder;
begin
if Value = 'ascending' then
Result := TSortOrder.Ascending
else if Value = 'descending' then
Result := TSortOrder.Descending
else
raise EUnknownEnumerationValue.Create('Unknown sort order: ' + Value);
end;
procedure TSortColumns.ToggleSort(Index: TInteger32);
var
ColumnIndex: TInteger32;
SortColumn: TSortColumn;
begin
ColumnIndex := IndexOfColumn(Index);
if ColumnIndex = 0 then
Columns[0].SortOrder := NegateSortOrder(Columns[0].SortOrder)
else if ColumnIndex > 0 then
begin
SortColumn := Columns[ColumnIndex];
FSortColumns.ExtractAt(ColumnIndex);
FSortColumns.AddAt(0, SortColumn);
end
else
begin
SortColumn := TSortColumn.Create();
SortColumn.Column := Index;
SortColumn.SortOrder := TSortOrder.Ascending;
FSortColumns.AddAt(0, SortColumn);
end;
end;
procedure TSortColumns.WriteToXml(Element: TDomElement);
var
i: TInteger32;
begin
for i := 0 to Count - 1 do
Element.Nodes.Add(CreateDomElementFromColumn(Columns[i]));
end;
procedure TSortColumns.AssignFrom(Source: TSortColumns);
var
i: TInteger32;
begin
FSortColumns.Clear();
for i := 0 to Source.Count - 1 do
FSortColumns.Add(Source[i].Copy());
end;
procedure TSortColumns.Clear();
begin
FSortColumns.Clear();
end;
function TSortColumns.Copy(): TSortColumns;
begin
Result := TSortColumns.Create();
Result.AssignFrom(Self);
end;
function TSortColumns.Count(): TInteger32;
begin
Result := FSortColumns.Count;
end;
constructor TSortColumns.Create();
begin
inherited Create();
FSortColumns := TObjectList<TSortColumn>.Create();
end;
function TSortColumns.CreateDomElementFromColumn(Column: TSortColumn): TDomElement;
begin
Result := TDomElement.Create('Column');
Result.Attributes.Add('Index', Column.Column);
Result.Attributes.Add('Order', SortOrderToText(Column.SortOrder));
end;
function TSortColumns.CreateColumnFromDomElement(Element: TDomElement): TSortColumn;
begin
Result := TSortColumn.Create();
Result.Column := Element.Attributes.Get('Index').AsInteger();
Result.SortOrder := TextToSortOrder(Element.Attributes.Get('Order').AsText());
end;
destructor TSortColumns.Destroy();
begin
FSortColumns.Free();
inherited Destroy();
end;
function TSortColumns.GetColumns(Index: TInteger32): TSortColumn;
begin
Result := FSortColumns[Index];
end;
function TSortColumns.IndexOf(Column: TInteger32): TInteger32;
var
Index: TInteger32;
begin
Result := -1;
Index := 0;
while (Result = -1) and (Index < Count) do
if Columns[Index].Column = Column then
Result := Index
else
Inc(Index);
end;
function TSortColumns.IndexOfColumn(ColumnIndex: TInteger32): TInteger32;
var
Index: TInteger32;
SortColumn: TSortColumn;
begin
Result := -1;
Index := 0;
while (Result = -1) and (Index < Count) do
begin
SortColumn := Columns[Index];
if SortColumn.Column = ColumnIndex then
Result := Index
else
Inc(Index);
end;
end;
function TSortColumns.IsFirstInSortOrder(Column: TInteger32): TBoolean;
begin
Result := (Count > 0) and (Self[0].Column = Column);
end;
function TSortColumns.NegateSortOrder(SortOrder: TSortOrder): TSortOrder;
begin
case SortOrder of
TSortOrder.Ascending:
Result := TSortOrder.Descending;
TSortOrder.Descending:
Result := TSortOrder.Ascending;
else
raise EUnknownEnumerationValue.Create('Unknown sort order');
end;
end;
procedure TSortColumns.ReadFromXml(Element: TDomElement);
var
Iterator: TIterator<TDomElement>;
begin
FSortColumns.Clear();
Iterator := Element.CreateElementWithNameIterator('Column');
while Iterator.IsValid() do
begin
FSortColumns.Add(CreateColumnFromDomElement(Iterator.Current));
Iterator.GotoNext();
end;
Iterator.Free();
end;
{ TSortColumn }
function TSortColumn.Copy(): TSortColumn;
begin
Result := TSortColumn.Create();
Result.Column := Column;
Result.SortOrder := SortOrder;
end;
end.
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