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DUALLIST.PAS
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Pascal/Delphi Source File
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1999-08-11
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3KB
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129 lines
unit DualList;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Forms, Dialogs, Controls, StdCtrls,
Buttons;
type
TDualListDlg = class(TForm)
OKBtn: TButton;
CancelBtn: TButton;
HelpBtn: TButton;
SrcList: TListBox;
DstList: TListBox;
SrcLabel: TLabel;
DstLabel: TLabel;
IncludeBtn: TSpeedButton;
IncAllBtn: TSpeedButton;
ExcludeBtn: TSpeedButton;
ExAllBtn: TSpeedButton;
procedure IncludeBtnClick(Sender: TObject);
procedure ExcludeBtnClick(Sender: TObject);
procedure IncAllBtnClick(Sender: TObject);
procedure ExcAllBtnClick(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
procedure MoveSelected(List: TCustomListBox; Items: TStrings);
procedure SetItem(List: TListBox; Index: Integer);
function GetFirstSelection(List: TCustomListBox): Integer;
procedure SetButtons;
end;
var
DualListDlg: TDualListDlg;
implementation
{$R *.DFM}
procedure TDualListDlg.IncludeBtnClick(Sender: TObject);
var
Index: Integer;
begin
Index := GetFirstSelection(SrcList);
MoveSelected(SrcList, DstList.Items);
SetItem(SrcList, Index);
end;
procedure TDualListDlg.ExcludeBtnClick(Sender: TObject);
var
Index: Integer;
begin
Index := GetFirstSelection(DstList);
MoveSelected(DstList, SrcList.Items);
SetItem(DstList, Index);
end;
procedure TDualListDlg.IncAllBtnClick(Sender: TObject);
var
I: Integer;
begin
for I := 0 to SrcList.Items.Count - 1 do
DstList.Items.AddObject(SrcList.Items[I],
SrcList.Items.Objects[I]);
SrcList.Items.Clear;
SetItem(SrcList, 0);
end;
procedure TDualListDlg.ExcAllBtnClick(Sender: TObject);
var
I: Integer;
begin
for I := 0 to DstList.Items.Count - 1 do
SrcList.Items.AddObject(DstList.Items[I], DstList.Items.Objects[I]);
DstList.Items.Clear;
SetItem(DstList, 0);
end;
procedure TDualListDlg.MoveSelected(List: TCustomListBox; Items: TStrings);
var
I: Integer;
begin
for I := List.Items.Count - 1 downto 0 do
if List.Selected[I] then
begin
Items.AddObject(List.Items[I], List.Items.Objects[I]);
List.Items.Delete(I);
end;
end;
procedure TDualListDlg.SetButtons;
var
SrcEmpty, DstEmpty: Boolean;
begin
SrcEmpty := SrcList.Items.Count = 0;
DstEmpty := DstList.Items.Count = 0;
IncludeBtn.Enabled := not SrcEmpty;
IncAllBtn.Enabled := not SrcEmpty;
ExcludeBtn.Enabled := not DstEmpty;
ExAllBtn.Enabled := not DstEmpty;
end;
function TDualListDlg.GetFirstSelection(List: TCustomListBox): Integer;
begin
for Result := 0 to List.Items.Count - 1 do
if List.Selected[Result] then Exit;
Result := LB_ERR;
end;
procedure TDualListDlg.SetItem(List: TListBox; Index: Integer);
var
MaxIndex: Integer;
begin
with List do
begin
SetFocus;
MaxIndex := List.Items.Count - 1;
if Index = LB_ERR then Index := 0
else if Index > MaxIndex then Index := MaxIndex;
Selected[Index] := True;
end;
SetButtons;
end;
end.