帮帮我 高分送上哦(200分)

请各位高手们帮帮我哦 我想做一在程序运行时就如同在程序设计时那样任意调整控件的位置，大小 多选中对齐
最好能有Demo参考
谢谢了！

那你直接就用Delphi的IDE不就行了？

想让用户可以爱自己的爱好调整界面
还有， 我的数据库表中字段用可以添加修 ,自然界面也需要调整哦

unit Unit1;

interface

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, ExtCtrls;

type
TAnalysisControl = class(TCustomControl)
public
procedure MouseDown(Button : TMouseButton; Shift : TShiftState; X,Y : integer); override;
procedure MouseMove(Shift : TShiftState; X,Y : Integer); override;
procedure Paint; override;
end;

TForm1 = class(TForm)
procedure FormCreate(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;

const
sizeBorder = 2;

sc_SizeLeft = $F001; { these are the variations on the }
sc_SizeRight = $F002; { SC_SIZE value }
sc_SizeTop = $F003;
sc_SizeTopLeft = $F004;
sc_SizeTopRight = $F005;
sc_SizeBottom = $F006;
sc_SizeBottomRight = $F008;
sc_SizeBottomLeft = $F007;
sc_DragMove = $F012;

implementation

uses Winprocs;
{$R *.dfm}

{ TAnalysisControl }

procedure TAnalysisControl.MouseDown(Button: TMouseButton;
Shift: TShiftState; X, Y: integer);
begin
if Button = mbLeft then
begin
ReleaseCapture;

if (X >= Width - sizeBorder) And NOT((Y <= sizeBorder) or (Y >= Height - sizeBorder)) then
Self.Perform(WM_SysCommand,sc_SizeRight,0)
else
if Not((X <= sizeBorder) or (X >= Width - sizeBorder)) And (Y <= sizeBorder) then
Self.Perform(WM_SysCommand,sc_SizeTop,0)
else
if (X <= sizeBorder) And (Y <= sizeBorder) then
Self.Perform(WM_SysCommand,sc_SizeTopLeft,0)
else
if (X >= Width - sizeBorder) and (Y <= sizeBorder) then
Self.Perform( WM_SysCommand, sc_SizeTopRight , 0 )
else
if Not((X <= sizeBorder) or (X >= Width - sizeBorder)) And (Y >= Height - sizeBorder) then
Self.Perform(WM_SysCommand,sc_SizeBottom,0)
else
if (Y >= Height - sizeBorder) And (X <= sizeBorder) then
Self.Perform(WM_SysCommand,sc_SizeBottomLeft,0)
else
if (Y >= Height - sizeBorder) and (X >= Width - sizeBorder) then
Self.Perform(WM_SysCommand, sc_SizeBottomRight, 0)
else
if Not((Y <= sizeBorder) or (Y >= Height - sizeBorder)) And (X <= sizeBorder) then
Self.Perform(WM_SysCommand,sc_SizeLeft,0)
else
begin
Self.Perform(WM_SysCommand,SC_DragMove,0);
end;

end;

end;

procedure TAnalysisControl.MouseMove(Shift: TShiftState; X, Y: Integer);
begin
if (X <= sizeBorder) or (X >= Width - sizeBorder) then
begin
if (Y >= Height - sizeBorder) then
begin
if (X >= Width - sizeBorder) then
Cursor := crSizeNWSE
else
Cursor := crSizeNESW;
end
else
if (Y <= sizeBorder) then
begin
if (X >= Width - sizeBorder) then
Cursor := crSizeNESW
else
Cursor := crSizeNWSE;
end
else
Cursor := crSizeWE;
end
else
if (Y <= sizeBorder) or (Y >= Height - sizeBorder) then
begin
Cursor := crSizeNS;
end
else
Cursor := crDefault;

end;

procedure TAnalysisControl.Paint;
var
Rect: TRect;
info: string;
begin
Info := '测试程序';
With Canvas do
begin
Brush.Color := clWhite;
Brush.Style := bsSolid;
Rect := Self.GetClientRect;
FillRect(Rect);
//如何绘制居中的文字
OffSetRect(Rect, 0, 4);
DrawText(GetDc(Self.Handle), PChar(Info), Length(Info), Rect, DT_Center);
end;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
With TAnalysisControl.Create(Self) do
begin
Parent := Self;
Left := 20;
Top := 20;
// Shape := stRectangle;
Height := 90;
Width := 90;
end;
end;

end.

unit Handles;

interface

uses
SysUtils, WinTypes, WinProcs, Messages, Classes, Graphics, Controls,
Forms, Menus, StdCtrls, Dialogs;
{ miscellaneous type declarations }
type
TDragStyle = (dsMove, dsSizeTopLeft, dsSizeTopRight, dsSizeBottomLeft, dsSizeBottomRight,
dsSizeTop, dsSizeLeft, dsSizeBottom, dsSizeRight);
TForwardMessage = (fmMouseDown, fmMouseUp);
GridValues = 1..32;
EBadChild = class(Exception);
{ TStretchHandle component declaration }
type
TStretchHandle = class(TCustomControl)
private
FDragOffset: TPoint;
FDragStyle: TDragStyle;
FDragging: boolean;
FDragRect: TRect;
FLocked: boolean;
FPrimaryColor: TColor;
FSecondaryColor: TColor;
FGridX, FGridY: GridValues;
FChildList: TList;
procedure WMEraseBkgnd(var Message: TWMEraseBkgnd); message WM_ERASEBKGND;
procedure WMGetDLGCode(var Message: TMessage); message WM_GETDLGCODE;
procedure Rubberband(XPos, YPos: integer; ShowBox: boolean);
procedure ForwardMessage(FwdMsg: TForwardMessage; Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
procedure SetPrimaryColor(Color: TColor);
procedure SetSecondaryColor(Color: TColor);
procedure SetGridState(Value: boolean);
function GetGridState: boolean;
function GetChildCount: integer;
function GetChildControl(idx: integer): TControl;
function GetModifiedRect(XPos, YPos: integer): TRect;
function PointOverChild(P: TPoint): boolean;
function XGridAdjust(X: integer): integer;
function YGridAdjust(Y: integer): integer;
function IsAttached: boolean;
protected
procedure MouseDown(Button: TMouseButton; Shift: TShiftState; X, Y: Integer); override;
procedure MouseUp(Button: TMouseButton; Shift: TShiftState; X, Y: Integer); override;
procedure MouseMove(Shift: TShiftState; X, Y: Integer); override;
procedure KeyDown(var key: Word; Shift: TShiftState); override;
procedure CreateParams(var Params: TCreateParams); override;
procedure Paint; override;
property Canvas;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
procedure Attach(ChildControl: TControl);
procedure Detach;
procedure ReleaseChild(ChildControl: TControl);
procedure SetBounds(ALeft, ATop, AWidth, AHeight: Integer); override;
procedure BringToFront;
procedure SendToBack;
procedure SetColors(Color1, Color2: TColor);
function IndexOf(ChildControl: TControl): integer;
{ new run-time only properties }
property Attached: boolean read IsAttached;
property ChildCount: integer read GetChildCount;
property Children[idx: integer]: TControl read GetChildControl;
published
{ new properties }
property Color: TColor read FPrimaryColor write SetPrimaryColor default clBlack;
property SecondaryColor: TColor read FSecondaryColor write SetSecondaryColor default clGray;
property Locked: boolean read FLocked write FLocked default False;
property GridX: GridValues read FGridX write FGridX default 8;
property GridY: GridValues read FGridY write FGridY default 8;
property SnapToGrid: boolean read GetGridState write SetGridState default False;
{ inherited properties }
property DragCursor;
property Enabled;
property Hint;
property ParentShowHint;
property PopupMenu;
property ShowHint;
property Visible;
{ defined events }
property OnClick;
property OnDblClick;
property OnMouseDown;
property OnMouseMove;
property OnMouseUp;
property OnKeyDown;
property OnKeyUp;
property OnKeyPress;
end;

procedure Register;
function MinInt(a, b: integer): integer;
function MaxInt(a, b: integer): integer;

implementation

procedure Register;
begin
{ add the component to the 'Samples' tab }
RegisterComponents('Samples', [TStretchHandle]);

end;

constructor TStretchHandle.Create(AOwner: TComponent);
begin

inherited Create(AOwner);
{ create storage for child objects }
FChildList := TList.Create;
{ initialize default properties }
Width := 24;
Height := 24;
FPrimaryColor := clBlack;
FSecondaryColor := clGray;
{ a value of 1 is used to effectively disable the snap-to grid }
FGridX := 1;
FGridY := 1;
{ doesn't do anything until it is Attached to something else }
Enabled := False;
Visible := False;

end;

destructor TStretchHandle.Destroy;
begin
{ tidy up carefully }
FChildList.Free;
inherited Destroy;

end;

procedure TStretchHandle.CreateParams(var Params: TCreateParams);
begin
{ set default Params values }
inherited CreateParams(Params);
{ then add transparency; ensures correct repaint order }
Params.ExStyle := Params.ExStyle + WS_EX_TRANSPARENT;

end;

procedure TStretchHandle.WMGetDLGCode(var Message: TMessage);
begin
{ get arrow key press events }
Message.Result := DLGC_WANTARROWS;

end;

procedure TStretchHandle.WMEraseBkgnd(var Message: TWMEraseBkgnd);
begin
{ completely fake erase, don't call inherited, don't collect $200 }
Message.Result := 1;

end;

procedure TStretchHandle.Attach(ChildControl: TControl);
var
L, T, W, H: integer;
begin
{ definitely not allowed! }
if ChildControl is TForm then
raise EBadChild.Create('Handles can not be attached to a Form!');
{ add child component to unique list managed by TStretchHandle }
if (ChildControl <> nil) and (FChildList.IndexOf(TObject(ChildControl)) = -1) then
begin
{ make sure new child's Parent matches siblings }
if (FChildList.Count > 0) and (ChildControl.Parent <> Parent) then
Detach;
{ initialize when first child is attached }
if FChildList.Count = 0 then
begin
Parent := ChildControl.Parent;
{ only make it visible now, to avoid color flashing, & accept events }
FDragRect := Rect(0, 0, 0, 0);
Enabled := True;
Visible := True;
inherited SetBounds(ChildControl.Left - 2, ChildControl.Top - 2, ChildControl.Width + 5, ChildControl.Height + 5);

end
else
begin
{ set size to bound all children, plus room for handles }
L := MinInt(Left, ChildControl.Left - 2);
T := MinInt(Top, ChildControl.Top - 2);
W := Maxint(Left + Width - 3, ChildControl.Left + ChildControl.Width) - L + 3;
H := Maxint(Top + Height - 3, ChildControl.Top + ChildControl.Height) - T + 3;
inherited SetBounds(L, T, W, H);

end;
{ add to list of active Children }
FChildList.Add(TObject(ChildControl));
{ re-set DragStyle }
FDragStyle := dsMove;
{ use old BringToFront so as not to change Child's Z-order }
if not (csDesigning in ComponentState) then
begin
inherited BringToFront;
{ allow us to get Mouse events immediately! }
SetCapture(Handle);
{ get keyboard events }
if Visible and Enabled then
SetFocus;
end;

end;

end;

procedure TStretchHandle.Detach;
begin
{ remove all Child components from list }
if FChildList.Count > 0 then
with FChildList do
repeat
Delete(0);
until Count = 0;
{ disable & hide StretchHandle }
FLocked := False;
Width := 24;
Height := 24;
Enabled := False;
Visible := False;
Parent := nil;
FDragRect := Rect(0, 0, 0, 0);

end;

procedure TStretchHandle.ReleaseChild(ChildControl: TControl);
var
idx, L, T, W, H: integer;
AControl: TControl;
begin
{ delete the Child if it exists in the list }
idx := FChildList.IndexOf(TObject(ChildControl));
if (ChildControl <> nil) and (idx >= 0) then
FChildList.Delete(idx);
{ disable & hide StretchHandle if no more children }
if FChildList.Count = 0 then
begin
FLocked := False;
Enabled := False;
Visible := False;
Parent := nil;
FDragRect := Rect(0, 0, 0, 0);
end
else
begin
{ set size to bound remaining children, plus room for handles }
L := TControl(FChildList.Items[0]).Left - 2;
T := TControl(FChildList.Items[0]).Top - 2;
W := TControl(FChildList.Items[0]).Width + 3;
H := TControl(FChildList.Items[0]).Height + 3;

for idx := 0 to FChildList.Count - 1 do
begin
AControl := TControl(FChildList.Items[idx]);
L := MinInt(L, AControl.Left - 2);
T := MinInt(T, AControl.Top - 2);
W := Maxint(L + W - 3, AControl.Left + AControl.Width) - L + 3;
H := Maxint(T + H - 3, AControl.Top + AControl.Height) - T + 3;
end;

inherited SetBounds(L, T, W, H);

end;

end;

function TStretchHandle.IndexOf(ChildControl: TControl): integer;
begin
{ simply pass on the result... }
Result := FChildList.IndexOf(TObject(ChildControl));

end;

procedure TStretchHandle.BringToFront;
var
i: integer;
begin
{ do nothing if not Attached }
if Attached and not Locked then
begin
{ take care of Children first, in Attach order }
for i := 0 to FChildList.Count - 1 do
begin
TControl(FChildList).BringToFront;
end;
{ make sure keyboard focus is restored }
inherited BringToFront;
if Visible and Enabled then
SetFocus;
end;

end;

procedure TStretchHandle.SendToBack;
var
i: integer;
begin
{ do nothing if not Attached }
if Attached and not Locked then
begin
{ take care of Children first, in Attach order }
for i := 0 to FChildList.Count - 1 do
begin
TControl(FChildList).SendToBack;
end;
{ Handles stay in front of everything, always }
inherited BringToFront;
if Visible and Enabled then
SetFocus;
end;

end;

procedure TStretchHandle.MouseDown(Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
begin
{ only process MouseDown if it is over a Child, else forward }
if PointOverChild(Point(Left + X, Top + Y)) then
begin
if (Button = mbLeft) and not FLocked then
begin
FDragOffset := Point(X, Y);
FDragging := True;
end;
inherited MouseDown(Button, Shift, X, Y);
end
else
begin
Cursor := crDefault;
SetCursor(Screen.Cursors[Cursor]);
ForwardMessage(fmMouseDown, Button, Shift, Left + X, Top + Y);
end;

end;

procedure TStretchHandle.MouseUp(Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
var
ARect: TRect;
begin
{ resize, reposition if anything changed }
if FDragging and (Button = mbLeft) then
begin
{ disallow drop off Parent }
if (Left + X) < 0 then
X := -Left;
if (Top + Y) < 0 then
Y := -Top;
if (Left + X) > Parent.Width then
X := Parent.Width - Left;
if (Top + Y) > Parent.Height then
Y := Parent.Height - Top;
{ force Paint when size doesn't change but position does }
if (X <> FDragOffset.X) or (Y <> FDragOffset.Y) then
begin
Invalidate;
ARect := GetModifiedRect(X, Y);
SetBounds(ARect.Left, ARect.Top, ARect.Right, ARect.Bottom);
end;
{ clear drag outline }
RubberBand(0, 0, False);
{ seem to need this for keyboard events }
if Visible and Enabled then
SetFocus;

FDragging := False;
Cursor := crDefault;
ReleaseCapture;
{ perform default processing }
{ inherited MouseUp(Button, Shift, X, Y); Remove By Tom Lee }

end
else
ForwardMessage(fmMouseUp, Button, Shift, Left + X, Top + Y);

inherited MouseUp(Button, Shift, X, Y); { Modify By Tom Lee }
end;

procedure TStretchHandle.MouseMove(Shift: TShiftState; X, Y: Integer);
var
ARect: TRect;
DragStyle: TDragStyle;
begin
{ this may be a move immediately on Attach instead of MouseDown }
if (ssLeft in Shift) and not FDragging and not FLocked then
begin
FDragOffset := Point(X, Y);
FDragging := True;
end
{ only recognize move after simulated MouseDown }
else
begin
{ let's not hog mouse events unnecessarily }
if not (ssLeft in Shift) then
ReleaseCapture;
{ default to drag cursor only when dragging }
DragStyle := dsMove;
Cursor := crDefault;
{ disallow resize if multiple children }
if FChildList.Count = 1 then
begin

ARect := GetClientRect;
{ so I don't like long nested if statements... }
if ((Abs(X - ARect.Left) < 5) and (Abs(Y - ARect.Top) < 5)) then
begin
DragStyle := dsSizeTopLeft;
Cursor := crSizeNWSE;
end;

if ((Abs(X - ARect.Right) < 5) and (Abs(Y - ARect.Bottom) < 5)) then
begin
DragStyle := dsSizeBottomRight;
Cursor := crSizeNWSE;
end;

if ((Abs(X - ARect.Right) < 5) and (Abs(Y - ARect.Top) < 5)) then
begin
DragStyle := dsSizeTopRight;
Cursor := crSizeNESW;
end;

if ((Abs(X - ARect.Left) < 5) and (Abs(Y - ARect.Bottom) < 5)) then
begin
DragStyle := dsSizeBottomLeft;
Cursor := crSizeNESW;
end;

if ((Abs(X - trunc(ARect.Right - ARect.Left) / 2) < 3) and (Abs(Y - ARect.Top) < 5)) then
begin
DragStyle := dsSizeTop;
Cursor := crSizeNS;
end;

if ((Abs(X - trunc(ARect.Right - ARect.Left) / 2) < 3) and (Abs(Y - ARect.Bottom) < 5)) then
begin
DragStyle := dsSizeBottom;
Cursor := crSizeNS;
end;

if ((Abs(Y - trunc(ARect.Bottom - ARect.Top) / 2) < 3) and (Abs(X - ARect.Left) < 5)) then
begin
DragStyle := dsSizeLeft;
Cursor := crSizeWE;
end;

if ((Abs(Y - trunc(ARect.Bottom - ARect.Top) / 2) < 3) and (Abs(X - ARect.Right) < 5)) then
begin
DragStyle := dsSizeRight;
Cursor := crSizeWE;
end;

end;
{ if position-locked, override cursor change }
if FLocked then
Cursor := crNoDrop;

if FDragging then
begin
{ disallow drag off Parent }
if (Left + X) < 0 then
X := -Left;
if (Top + Y) < 0 then
Y := -Top;
if (Left + X) > Parent.Width then
X := Parent.Width - Left;
if (Top + Y) > Parent.Height then
Y := Parent.Height - Top;
{ display cursor & drag outline }
if FDragStyle = dsMove then
Cursor := DragCursor;
SetCursor(Screen.Cursors[Cursor]);
RubberBand(X, Y, True);

end
else
FDragStyle := DragStyle;

end;
{ perform default processing }
inherited MouseMove(Shift, X, Y);

end;

procedure TStretchHandle.ForwardMessage(FwdMsg: TForwardMessage; Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
var
i: integer;
Found: boolean;
Msg: Word;
ARect: TRect;
AControl: TControl;
AMessage: TMessage;
begin
{ construct the message to be sent }
case FwdMsg of
fmMouseDown:
case Button of
mbLeft:
Msg := WM_LBUTTONDOWN;
mbMiddle:
Msg := WM_MBUTTONDOWN;
mbRight:
Msg := WM_RBUTTONDOWN;
end;
fmMouseUp:
case Button of
mbLeft:
Msg := WM_LBUTTONUP;
mbMiddle:
Msg := WM_MBUTTONUP;
mbRight:
Msg := WM_RBUTTONUP;
end;
end;

AMessage.WParam := 0;
{ determine whether X, Y is over any other windowed control }
Found := False;
for i := 0 to Parent.ControlCount - 1 do
begin
AControl := TControl(Parent.Controls);
if (AControl is TWinControl) and not (AControl is TStretchHandle) then
begin
ARect := Rect(AControl.Left,
AControl.Top,
AControl.Left + AControl.Width,
AControl.Top + AControl.Height);
{ X, Y are relative to Parent }
if PtInRect(ARect, Point(X, Y)) then
begin
Found := True;
break;
end;
end;
end;
{ forward the message to the control if found, else to the Parent }
if Found then
begin
AMessage.LParamLo := X - AControl.Left;
AMessage.LParamHi := Y - AControl.Top;
SendMessage(TWinControl(AControl).Handle, Msg, AMessage.WParam, AMessage.LParam);
end
else
begin
AMessage.LParamLo := X;
AMessage.LParamHi := Y;
SendMessage(Parent.Handle, Msg, AMessage.WParam, AMessage.LParam);
end;

end;

procedure TStretchHandle.KeyDown(var Key: Word; Shift: TShiftState);
begin
{ process arrow keys to move/resize Handles & Child, also move siblings }
case Key of
VK_UP:
begin
Invalidate;
SetBounds(Left, Top - 1, Width, Height);
end;
VK_DOWN:
begin
Invalidate;
SetBounds(Left, Top + 1, Width, Height);
end;
VK_LEFT:
begin
Invalidate;
SetBounds(Left - 1, Top, Width, Height);
end;
VK_RIGHT:
begin
Invalidate;
SetBounds(Left + 1, Top, Width, Height);
end;
end;

inherited KeyDown(Key, Shift);

end;

function TStretchHandle.GetModifiedRect(XPos, YPos: integer): TRect;
var
ARect: TRect;
begin
{ compute new position/size, depending on FDragStyle}
case FDragStyle of

dsSizeTopLeft:
begin
ARect.Left := XGridAdjust(Left + (XPos - FDragOffset.X)) - 2;
ARect.Top := YGridAdjust(Top + (YPos - FDragOffset.Y)) - 2;
ARect.Right := Width - (ARect.Left - Left);
ARect.Bottom := Height - (ARect.Top - Top);
end;

dsSizeTopRight:
begin
ARect.Left := Left;
ARect.Top := YGridAdjust(Top + (YPos - FDragOffset.Y)) - 2;
ARect.Right := XGridAdjust(Width + (XPos - FDragOffset.X)) - 3;
ARect.Bottom := Height - (ARect.Top - Top);
end;

dsSizeBottomLeft:
begin
ARect.Left := XGridAdjust(Left + (XPos - FDragOffset.X)) - 2;
ARect.Top := Top;
ARect.Right := Width - (ARect.Left - Left);
ARect.Bottom := YGridAdjust(Height + (YPos - FDragOffset.Y)) - 3;
end;

dsSizeBottomRight:
begin
ARect.Left := Left;
ARect.Top := Top;
ARect.Right := XGridAdjust(Width + (XPos - FDragOffset.X)) - 3;
ARect.Bottom := YGridAdjust(Height + (YPos - FDragOffset.Y)) - 3;
end;

dsSizeTop:
begin
ARect.Left := Left;
ARect.Top := YGridAdjust(Top + (YPos - FDragOffset.Y)) - 2;
ARect.Right := Width;
ARect.Bottom := Height - (ARect.Top - Top);
end;

dsSizeBottom:
begin
ARect.Left := Left;
ARect.Top := Top;
ARect.Right := Width;
ARect.Bottom := YGridAdjust(Height + (YPos - FDragOffset.Y)) - 3;
end;

dsSizeLeft:
begin
ARect.Left := XGridAdjust(Left + (XPos - FDragOffset.X)) - 2;
ARect.Top := Top;
ARect.Right := Width - (ARect.Left - Left);
ARect.Bottom := Height;
end;

dsSizeRight:
begin
ARect.Left := Left;
ARect.Top := Top;
ARect.Right := XGridAdjust(Width + (XPos - FDragOffset.X)) - 3;
ARect.Bottom := Height;
end;

else
{ keep size, move to new position }
ARect.Left := XGridAdjust(Left + (XPos - FDragOffset.X)) - 2;
ARect.Top := YGridAdjust(Top + (YPos - FDragOffset.Y)) - 2;
ARect.Right := Width;
ARect.Bottom := Height;

end;
{ impose a minimum size for sanity }
if ARect.Right < 5 then
ARect.Right := 5;
if ARect.Bottom < 5 then
ARect.Bottom := 5;

Result := ARect;

end;

procedure TStretchHandle.Rubberband(XPos, YPos: integer; ShowBox: boolean);
var
NewRect: TRect;
PtA, PtB: TPoint;
ScreenDC: HDC;
begin
{ outline is drawn over all windows }
ScreenDC := GetDC(0);
{ erase previous rectangle, if any, & adjust for handle's position }
if (FDragRect.Left <> 0) or (FDragRect.Top <> 0) or (FDragRect.Right <> 0) or (FDragRect.Bottom <> 0) then
begin
PtA := Parent.ClientToScreen(Point(FDragRect.Left + 2, FDragRect.Top + 2));
PtB := Parent.ClientToScreen(Point(FDragRect.Left + FDragRect.Right - 3, FDragRect.Top + FDragRect.Bottom - 3));
DrawFocusRect(ScreenDC, Rect(PtA.X, PtA.Y, PtB.X, PtB.Y));
FDragRect := Rect(0, 0, 0, 0);
end;
{ draw new rectangle unless this is a final erase }
if ShowBox then
begin
NewRect := GetModifiedRect(XPos, YPos);
PtA := Parent.ClientToScreen(Point(NewRect.Left + 2, NewRect.Top + 2));
PtB := Parent.ClientToScreen(Point(NewRect.Left + NewRect.Right - 3, NewRect.Top + NewRect.Bottom - 3));
DrawFocusRect(ScreenDC, Rect(PtA.X, PtA.Y, PtB.X, PtB.Y));
FDragRect := NewRect;
end
else
begin
Parent.Repaint;
Repaint;
end;

ReleaseDC(0, ScreenDC);

end;

procedure TStretchHandle.SetBounds(ALeft, ATop, AWidth, AHeight: Integer);
var
WasVisible: boolean;
i: integer;
AControl: TControl;
begin
{ hide & preserve fixed size in design mode }
WasVisible := Visible;
if csDesigning in ComponentState then
begin
Visible := False;
inherited SetBounds(ALeft, ATop, 24, 24);
end
else { move child also, if any (but only if not locked) }
if not FLocked then
begin
for i := 0 to FChildList.Count - 1 do
begin
AControl := FChildList;
AControl.SetBounds(AControl.Left - Left + ALeft,
AControl.Top - Top + ATop,
AControl.Width - Width + AWidth,
AControl.Height - Height + AHeight);
end;
inherited SetBounds(ALeft, ATop, AWidth, AHeight);
end;
{ restore visibility }
if Visible = False then
Visible := WasVisible;

end;

procedure TStretchHandle.Paint;
var
AControl: TControl;
ARect, BoxRect: TRect;
i: integer;
begin

inherited Paint;
{ do it differently at design time... }
if csDesigning in ComponentState then
begin
Canvas.Brush.Color := FPrimaryColor;
BoxRect := Rect(0, 0, 5, 5);
Canvas.FillRect(BoxRect);
BoxRect := Rect(19, 0, 24, 5);
Canvas.FillRect(BoxRect);
BoxRect := Rect(19, 19, 24, 24);
Canvas.FillRect(BoxRect);
BoxRect := Rect(0, 19, 5, 24);
Canvas.FillRect(BoxRect);
end
else
begin
{ set color to primary if only one child, else secondary }
if FChildList.Count = 1 then
Canvas.Brush.Color := FPrimaryColor
else
Canvas.Brush.Color := FSecondaryColor;
{ draw resize handles for each child }
for i := 0 to FChildList.Count - 1 do
begin

AControl := TControl(FChildList.Items);
ARect := Rect(AControl.Left - Left - 2,
AControl.Top - Top - 2,
AControl.Left - Left + AControl.Width + 2,
AControl.Top - Top + AControl.Height + 2);

with Canvas do
begin
{ draw corner boxes (assuming Canvas is minimum 5x5) }
BoxRect := Rect(ARect.Left, ARect.Top, ARect.Left + 5, ARect.Top + 5);
FillRect(BoxRect);
BoxRect := Rect(ARect.Right - 5, ARect.Top, ARect.Right, ARect.Top + 5);
FillRect(BoxRect);
BoxRect := Rect(ARect.Right - 5, ARect.Bottom - 5, ARect.Right, ARect.Bottom);
FillRect(BoxRect);
BoxRect := Rect(ARect.Left, ARect.Bottom - 5, ARect.Left + 5, ARect.Bottom);
FillRect(BoxRect);
{ only for single Children, draw center boxes }
if FChildList.Count = 1 then
begin
BoxRect := Rect(ARect.Left + trunc((ARect.Right - ARect.Left) / 2) - 2,
ARect.Top,
ARect.Left + trunc((ARect.Right - ARect.Left) / 2) + 3,
ARect.Top + 5);
FillRect(BoxRect);
BoxRect := Rect(ARect.Left + trunc((ARect.Right - ARect.Left) / 2) - 2,
ARect.Bottom - 5,
ARect.Left + trunc((ARect.Right - ARect.Left) / 2) + 3,
ARect.Bottom);
FillRect(BoxRect);
BoxRect := Rect(ARect.Left,
ARect.Top + trunc((ARect.Bottom - ARect.Top) / 2) - 2,
ARect.Left + 5,
ARect.Top + trunc((ARect.Bottom - ARect.Top) / 2) + 3);
FillRect(BoxRect);
BoxRect := Rect(ARect.Right - 5,
ARect.Top + trunc((ARect.Bottom - ARect.Top) / 2) - 2,
ARect.Right,
ARect.Top + trunc((ARect.Bottom - ARect.Top) / 2) + 3);
FillRect(BoxRect);
end;

end;

end;

end;

end;

procedure TStretchHandle.SetPrimaryColor(Color: TColor);
begin
{ set single select color, repaint immediately }
FPrimaryColor := Color;
Repaint;

end;

procedure TStretchHandle.SetSecondaryColor(Color: TColor);
begin
{ set multiple select color, repaint immediately }
FSecondaryColor := Color;
Repaint;

end;

procedure TStretchHandle.SetColors(Color1, Color2: TColor);
begin
{ set single/multiple select colors, repaint }
FPrimaryColor := Color1;
FSecondaryColor := Color2;
Repaint;

end;

procedure TStretchHandle.SetGridState(Value: boolean);
begin
{ a value of 1 effectively disables a grid axis }
if Value then
begin
FGridX := 8;
FGridY := 8;
end
else
begin
FGridX := 1;
FGridY := 1;
end;

end;

function TStretchHandle.GetGridState: boolean;
begin

if (FGridX > 1) or (FGridY > 1) then
Result := True
else
Result := False;

end;

function TStretchHandle.GetChildCount: integer;
begin
Result := FChildList.Count;
end;

function TStretchHandle.GetChildControl(idx: integer): TControl;
begin

if (FChildList.Count > 0) and (idx >= 0) then
Result := FChildList[idx]
else
Result := nil;

end;

function TStretchHandle.IsAttached: boolean;
begin

if FChildList.Count > 0 then
Result := True
else
Result := False;

end;

function TStretchHandle.PointOverChild(P: TPoint): boolean;
var
i: integer;
ARect: TRect;
AControl: TControl;
begin
{ determine whether X, Y is over any child (for dragging) }
Result := False;
for i := 0 to FChildList.Count - 1 do
begin
AControl := TControl(FChildList);
ARect := Rect(AControl.Left - 2,
AControl.Top - 2,
AControl.Left + AControl.Width + 2,
AControl.Top + AControl.Height + 2);
{ P is relative to the Parent }
if PtInRect(ARect, P) then
begin
Result := True;
break;
end;
end;

end;

function TStretchHandle.XGridAdjust(X: integer): integer;
begin
Result := (X DIV FGridX) * FGridX;
end;

function TStretchHandle.YGridAdjust(Y: integer): integer;
begin
Result := (Y DIV FGridY) * FGridY;
end;

function MinInt(a, b: integer): integer;
begin
if a < b then
Result := a
else
Result := b;
end;

function MaxInt(a, b: integer): integer;
begin
if a > b then
Result := a
else
Result := b;
end;

end.

am2001 (2003-12-12 13:45:00)
学习...

ch (2003-12-12 14:59:00)
非常感谢李宝库!先研究一下...

mystudy (2003-12-12 15:08:00)
收藏

ch (2003-12-12 15:48:00)
终于试出来了,完全符合要求,再次感谢李宝库!
下面是试用工程文件
unit Unit1;

interface

uses
SysUtils, WinTypes, WinProcs, Messages, Classes, Graphics, Controls,
Forms, Dialogs, Handles, StdCtrls, ExtCtrls;

type
TForm1 = class(TForm)
Memo1: TMemo;
Label1: TLabel;
Button1: TButton;
Panel1: TPanel;
Edit1: TEdit;
Button2: TButton;
Button3: TButton;
Button4: TButton;
Button5: TButton;
StretchHandle1: TStretchHandle;
procedure Button5Click(Sender: TObject);
procedure Button4Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure Button3Click(Sender: TObject);
procedure FormClick(Sender: TObject);
procedure Memo1MouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
procedure Label1MouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
procedure Button1MouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
procedure Panel1MouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
procedure Edit1MouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Button5Click(Sender: TObject);
begin
Close;
end;

procedure TForm1.Button4Click(Sender: TObject);
begin
StretchHandle1.Locked := not StretchHandle1.Locked;
if StretchHandle1.Locked then
Button4.Caption := 'Unlock'
else
Button4.Caption := 'Lock';
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
StretchHandle1.BringToFront;
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
StretchHandle1.SendToBack;
end;

procedure TForm1.FormClick(Sender: TObject);
begin
StretchHandle1.Detach;
StretchHandle1.Locked := False;
Button4.Caption := 'Lock';
end;

procedure TForm1.Memo1MouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
begin
StretchHandle1.Attach(Memo1);
end;

procedure TForm1.Label1MouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
begin
StretchHandle1.Attach(Label1);
end;

procedure TForm1.Button1MouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
begin
StretchHandle1.Attach(Button1);
end;

procedure TForm1.Panel1MouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
begin
StretchHandle1.Attach(Panel1);
end;

procedure TForm1.Edit1MouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
begin
StretchHandle1.Attach(Edit1);
end;

end.