Contributor: RICHARD HOWARD
{coolbox.pas}
{A note from the author:
I needed to do some spiffy things with the listboxes so I wrote this. If it already exists, then great, but I couldn't find it. With this small program, you can multi-select items from ListBox1 and drag them to ListBox2. No big deal, except that you
The really cool thing here is that you can select an item in ListBox2 and move it into a another spot within the list by using the arrows or by dragging and dropping. Again, I couldn't find any code that already did this. I hope you find this code us
Richard Howard 71553,2544
Mei Technology Corporation
26 August 1995}
unit CoolBox;
interface
uses
SysUtils, WinTypes, WinProcs, Messages, Classes, Graphics, Controls,
Forms, Dialogs, StdCtrls, Buttons, Spin;
type
TForm1 = class(TForm)
ListBox1: TListBox;
ListBox2: TListBox;
SpinButton1: TSpinButton; {for moving items in listbox2.}
procedure ListBox2DragOver(Sender, Source: TObject; X, Y: Integer;
State: TDragState; var Accept: Boolean);
procedure ListBox2DragDrop(Sender, Source: TObject; X, Y: Integer);
procedure ListBox2MouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
procedure ListBox1DragOver(Sender, Source: TObject; X, Y: Integer;
State: TDragState; var Accept: Boolean);
procedure FormCreate(Sender: TObject);
procedure MoveUp(Sender: TObject);
procedure MoveDown(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
MoveSelectedItem : Integer; {the item in ListBox2 being moved}
DnListBox1 : Boolean; {indicates which listbox to work with}
DnListBox2 : Boolean; {indicates which listbox to work with}
implementation
{$R *.DFM}
procedure TForm1.ListBox2DragOver(Sender, Source: TObject; X, Y: Integer;
State: TDragState; var Accept: Boolean);
begin
if (Source is TListBox) then Accept := True;
{because this is such a small program, 'ACCEPT := True' would work. But
larger programs need a little more control.}
end;
procedure TForm1.ListBox2DragDrop(Sender, Source: TObject; X, Y: Integer);
var
i : Integer; {serves two purposes: 1) a counting variable for ListBox1,
and 2) the item that the SELECTED item is being dropped on to
in ListBox 2}
begin {procedure}
{instructions for moving items from ListBox1 to ListBox2}
if DnListBox1 then
begin {if 1}
for i := 0 to ListBox1.Items.Count - 1 do {look at ALL items in ListBox1}
begin {for}
if ListBox1.Selected[i] then
ListBox2.Items.Insert(ListBox2.ItemAtPos(Point(X,Y), True), ListBox1.Items[i]);
ListBox1.Selected[i] := False; {after copying to LB2, UNselect it}
end; {for}
DnListBox1 := False;
end; {if 1}
{instructions for moving an item WITHIN ListBox2}
if DnListBox2 then
begin {if 2}
{i = the item UNDER the moving, selected item}
i := ListBox2.ItemAtPos(Point(X, Y), True);
ListBox2.Items.Move(MoveSelectedItem, i); {puts the moved item into place}
ListBox2.ItemIndex := i; {select (highlight) the item you moved}
if i = -1 then ListBox2.ItemIndex := ListBox2.Items.Count-1;
DnListBox2 := False;
end; {if 2}
end; {procedure}
procedure TForm1.ListBox2MouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
begin {procedure}
DnListBox1 := False;{tells the OnDragDrop procedure which instructions to use}
DnListBox2 := True;{tells the OnDragDrop procedure which instructions to use}
if Button = mbLeft then
if ListBox2.ItemAtPos(Point(X, Y), True)>= 0 then
MoveSelectedItem := ListBox2.ItemIndex;
end; {procedure}
procedure TForm1.ListBox1DragOver(Sender, Source: TObject; X, Y: Integer;
State: TDragState; var Accept: Boolean);
begin
DnListBox1 := True;
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
{I just threw these in here to look nice. They can be pretty handy.}
SendMessage(ListBox1.Handle, LB_SetHorizontalExtent, 1000, LongInt(0));
SendMessage(ListBox2.Handle, LB_SetHorizontalExtent, 1000, LongInt(0));
end;
procedure TForm1.MoveUp(Sender: TObject);
var
i : Integer;
begin {procedure}
if ListBox2.ItemIndex> 0 then
begin {if}
i := ListBox2.ItemIndex;
ListBox2.Items.Move(i, i-1);
ListBox2.ItemIndex := i-1;
end; {if}
end; {procedure}
procedure TForm1.MoveDown(Sender: TObject);
var
i : Integer;
begin {procedure}
if (ListBox2.ItemIndex < ListBox2.Items.Count-1) and (ListBox2.ItemIndex -1) then
begin {if}
i := ListBox2.ItemIndex;
ListBox2.Items.Move(i, i+1);
ListBox2.ItemIndex := i+1;
end; {if}
end; {procedure}
end.
{*********************}
{coolproj.dpr}
program Coolproj;
uses
Forms,
Coolbox in 'COOLBOX.PAS' {Form1};
{$R *.RES}
begin
Application.CreateForm(TForm1, Form1);
Application.Run;
end.
{*********************}
{Coolbox.dfm}
object Form1: TForm1
Left = 245
Top = 163
Width = 349
Height = 253
Caption = 'Form1'
Font.Color = clWindowText
Font.Height = -13
Font.Name = 'System'
Font.Style = []
PixelsPerInch = 96
OnCreate = FormCreate
TextHeight = 16
object ListBox1: TListBox
Left = 16
Top = 24
Width = 129
Height = 177
DragMode = dmAutomatic
ItemHeight = 16
Items.Strings = (
'List 1'
'List 2'
'List 3'
'List 4'
'List 5'
'List 6')
MultiSelect = True
TabOrder = 0
OnDragOver = ListBox1DragOver
end
object ListBox2: TListBox
Left = 168
Top = 24
Width = 129
Height = 177
DragMode = dmAutomatic
ItemHeight = 16
Items.Strings = (
'Test 1'
'Test 2'
'Test 3'
'Test 4')
TabOrder = 1
OnDragDrop = ListBox2DragDrop
OnDragOver = ListBox2DragOver
OnMouseDown = ListBox2MouseDown
end
object SpinButton1: TSpinButton
Left = 308
Top = 76
Width = 20
Height = 53
DownGlyph.Data = {
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TabOrder = 2
UpGlyph.Data = {
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OnDownClick = MoveDown
OnUpClick = MoveUp
end
end