TFlowPanel alike in D5 - delphi

Question

I am looking for an implementation of TFlowPanel (or similar) that will work with D5.
Basically I need the TFlowPanel to work inside a TScrollBox (with Vertical scroll bar), so the controls will wrap based on the Width of that TScrollBox.
The images basically show what I need:
After resizing the controls are automatically repositioned:
With Vertical scroll bar:

Answer 1

Just a concept. No various FlowTypes, and no possibility to change the order of the controls. You could still move them around by changing the order in the DFM, I think, or by resetting the parent.
The panel sizes vertically to fit all controls. This means, that when you put it inside a scrollbox it will automatically work.
unit uAlignPanel;
interface
uses
Windows, SysUtils, Classes, Controls, ExtCtrls;
type
TAlignPanel = class(TPanel)
protected
procedure SetChildOrder(Child: TComponent; Order: Integer); overload; override;
procedure SetZOrder(TopMost: Boolean); override;
public
procedure AlignControls(AControl: TControl; var Rect: TRect); override;
procedure Insert(AControl: TControl);
procedure Append(AControl: TControl);
function GetChildOrder(Child: TControl): Integer;
procedure SetChildOrder(Child: TControl; Order: Integer); reintroduce; overload; virtual;
procedure MoveChildBefore(Child: TControl; Sibling: TControl); virtual;
end;
procedure Register;
implementation
procedure Register;
begin
RegisterComponents('StackOverflow', [TAlignPanel]);
end;
{ TAlignPanel }
procedure TAlignPanel.AlignControls(AControl: TControl; var Rect: TRect);
var
i: Integer;
x, y: Integer;
LineHeight: Integer;
begin
x := 0; y := 0;
LineHeight := 0;
for i := 0 to ControlCount - 1 do
begin
if x + Controls[i].Width > ClientWidth then
begin
x := 0;
y := y + LineHeight;
LineHeight := 0;
end;
Controls[i].Top := y;
Controls[i].Left := x;
x := x + Controls[i].Width;
if Controls[i].Height > LineHeight then
LineHeight := Controls[i].Height;
end;
// Height + 1. Not only looks nices, but also prevents a small redrawing
// problem of the bottom line of the panel when adding controls.
ClientHeight := y + LineHeight + 1;
end;
procedure TAlignPanel.Append(AControl: TControl);
begin
AControl.Parent := Self;
AControl.BringToFront;
Realign;
end;
function TAlignPanel.GetChildOrder(Child: TControl): Integer;
begin
for Result := 0 to ControlCount - 1 do
if Controls[Result] = Child then
Exit;
Result := -1;
end;
procedure TAlignPanel.Insert(AControl: TControl);
begin
AControl.Parent := Self;
AControl.SendToBack;
Realign;
end;
procedure TAlignPanel.MoveChildBefore(Child, Sibling: TControl);
var
CurrentIndex: Integer;
NewIndex: Integer;
begin
if Child = Sibling then
raise Exception.Create('Child and sibling cannot be the same');
CurrentIndex := GetChildOrder(Child);
if CurrentIndex = -1 then
raise Exception.CreateFmt( 'Control ''%s'' is not a child of panel ''%s''',
[Sibling.Name, Name]);
if Sibling <> nil then
begin
NewIndex := GetChildOrder(Sibling);
if NewIndex = -1 then
raise Exception.CreateFmt( 'Sibling ''%s'' is not a child of panel ''%s''',
[Sibling.Name, Name]);
if CurrentIndex < NewIndex then
Dec(NewIndex);
end
else
NewIndex := ControlCount;
SetChildOrder(Child, NewIndex);
end;
procedure TAlignPanel.SetChildOrder(Child: TComponent; Order: Integer);
begin
inherited;
Realign;
end;
procedure TAlignPanel.SetChildOrder(Child: TControl; Order: Integer);
begin
SetChildOrder(TComponent(Child), Order);
end;
procedure TAlignPanel.SetZOrder(TopMost: Boolean);
begin
inherited;
Realign;
end;
end.