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procedure TResizer.SizerDown(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
begin
Sizing := True;
DownX := X;
DownY := Y;
HideSizers;
ResizeControl.Parent.Update;
ResizeControl.Update;
OrigSize := ResizeControl.BoundsRect;
NewSize := OrigSize;
DrawSizeRect(NewSize);
end;
procedure DoSwap(DoSwap: boolean; var a, b: integer);
var
t : integer;
begin
if DoSwap then begin
t := a;
a := b;
b := t;
end;
end;
procedure TResizer.SizerUp(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
begin
if NewSize.Right < NewSize.Left then
DoSwap(True, NewSize.Right, NewSize.Left);
if NewSize.Bottom < NewSize.Top then
DoSwap(True, NewSize.Bottom, NewSize.Top);
Sizing := False;
DrawSizeRect(NewSize);
ResizeControl.Invalidate;
ResizeControl.BoundsRect := NewSize;
ShowSizers;
if Assigned(OnSized) then OnSized(Self);
end;
procedure TResizer.SizerMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
begin
if Sizing then begin
DrawSizeRect(NewSize);
if AllowSize then begin
Calc_Size_Rect((Sender as TSizer).Tag, X - DownX, Y - DownY);
DoSizingEvent;
end;
DrawSizeRect(NewSize);
if HotTrack then ResizeControl.BoundsRect := NewSize;
end;
end;
procedure TResizer.DoSizingEvent;
var
tmpWid, tmpHgt : integer;
begin
tmpWid := NewSize.Right - NewSize.Left;
tmpHgt := NewSize.Bottom - NewSize.Top;
if Assigned(OnSizing) then
OnSizing(Self, NewSize.Left, NewSize.Top, tmpWid, tmpHgt);
NewSize.Right := NewSize.Left + tmpWid;
NewSize.Bottom := NewSize.Top + tmpHgt;
end;
procedure GetNonClientOffset(h: THandle; var nx, ny: integer);
var
p : TPoint;
R : TRect;
begin
p := Point(0, 0);
Windows.ClientToScreen(h, p);
Windows.GetWindowRect(h, R);
nx := p.x - R.Left;
ny := p.y - R.Top;
end;
procedure TResizer.DrawSizeRect(Rect: TRect);
var
h : THandle;
dc : THandle;
c : TCanvas;
nx, ny : integer;
OldPen : TPen;
OldBrush : TBrush;
begin
if HotTrack then exit;
h := (ResizeControl.Parent as TWinControl).Handle;
GetNonClientOffset(h, nx, ny);
dc := GetWindowDC(h);
try
c := TCanvas.Create;
c.Handle := dc;
OldPen := TPen.Create;
OldPen.Assign(c.Pen);
OldBrush := TBrush.Create;
OldBrush.Assign(c.Brush);
c.Pen.Width := 2;
c.Pen.Mode := pmXOR;
c.Pen.Color := clWhite;
c.Brush.Style := bsClear;
c.Rectangle(Rect.Left + nx, Rect.Top + ny, Rect.Right + nx, Rect.Bottom + ny);
c.Pen.Assign(OldPen);
OldPen.Free;
c.Brush.Assign(OldBrush);
OldBrush.Free;
c.Handle := 0;
c.Free;
finally
ReleaseDC(h, dc);
end;
end;
procedure TResizer.Calc_Size_Rect(SizerNum, dx, dy: integer);
begin
dx := (dx div GridX) * GridX;
dy := (dy div GridY) * GridY;
case SizerNum of
0, 1, 2 : NewSize.Top := OrigSize.Top + dy;
5, 6, 7 : NewSize.Bottom := OrigSize.Bottom + dy;
end;
case SizerNum of
0, 3, 5 : NewSize.Left := OrigSize.Left + dx;
2, 4, 7 : NewSize.Right := OrigSize.Right + dx;
end;
if KeepInParent then Constrain_Size;
end;
procedure TResizer.MoverDown(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
begin
CurMover := Sender as TMover;
FControl := CurMover.Buddy;
Assert(FControl<>nil);
FControl.BringToFront;
CurMover.BringToFront;
Moving := True;
DownX := X;
DownY := Y;
HideSizers;
ResizeControl.Parent.Update;
ResizeControl.Update;
OrigSize := ResizeControl.BoundsRect;
NewSize := OrigSize;
DrawSizeRect(NewSize);
end;
procedure TResizer.MoverUp(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
begin
Moving := False;
ResizeControl.BoundsRect := NewSize;
CurMover.Invalidate;
ResizeControl.Refresh;
DrawSizeRect(NewSize);
ShowSizers;
if Assigned(OnMoved) then OnMoved(Self);
end;
procedure TResizer.Calc_Move_Rect(dx, dy: integer);
begin
NewSize := OrigSize;
dx := (dx div GridX) * GridX;
dy := (dy div GridY) * GridY;
OffsetRect(NewSize, dx, dy);
if KeepInParent then Constrain_Move;
end;
procedure TResizer.DoMovingEvent;
var
tmpWid, tmpHgt : integer;
begin
tmpWid := NewSize.Right - NewSize.Left;
tmpHgt := NewSize.Bottom - NewSize.Top;
if Assigned(OnMoving) then
OnMoving(Self, NewSize.Left, NewSize.Top);
NewSize.Right := NewSize.Left + tmpWid;
NewSize.Bottom := NewSize.Top + tmpHgt;
end;
procedure TResizer.MoverMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
var
dx, dy: integer;
begin
if Moving then begin
DrawSizeRect(NewSize);
if AllowMove then begin
dx := X - DownX;
dy := Y - DownY;
Calc_Move_Rect(dx, dy);
DoMovingEvent;
end;
DrawSizeRect(NewSize);
if HotTrack then ResizeControl.BoundsRect := NewSize;
end;
end;
procedure TResizer.Constrain_Size;
var
p : TWinControl;
begin
p := ResizeControl.Parent;
with NewSize do begin
if Left < 0 then Left := 0;
if Top < 0 then Top := 0;
if Right > p.ClientWidth then Right := p.ClientWidth;
if Bottom > p.ClientHeight then Bottom := p.ClientHeight;
if Right < Left + GridX then Right := Left + GridX;
if Bottom < Top + GridY then Bottom := Top + GridY;
end;
end;
procedure TResizer.Constrain_Move;
begin
if NewSize.Left < 0 then
OffsetRect(NewSize, -NewSize.Left, 0);
if NewSize.Top < 0 then
OffsetRect(NewSize, 0, -NewSize.Top);
if NewSize.Right > ResizeControl.Parent.ClientWidth then
OffsetRect(NewSize, ResizeControl.Parent.ClientWidth - NewSize.Right, 0);
if NewSize.Bottom > ResizeControl.Parent.ClientHeight then
OffsetRect(NewSize, 0, ResizeControl.Parent.ClientHeight - NewSize.Bottom);
end;
procedure TResizer.MoverKeyDown(Sender: TObject; var Key: Word; Shift: TShiftState);
begin
if Active then begin
case Key of
VK_LEFT : DoSizeMove(Key, Shift, -GridX, 0);
VK_RIGHT : DoSizeMove(Key, Shift, GridX, 0);
VK_UP : DoSizeMove(Key, Shift, 0, -GridY);
VK_DOWN : DoSizeMove(Key, Shift, 0, GridY);
end;
end;
end;
procedure TResizer.DoSizeMove(var Key: Word; Shift: TShiftState; dx, dy: integer);
begin
if (ssCtrl in Shift) or (ssShift in Shift) then begin
Key := 0;
NewSize := ResizeControl.BoundsRect;
if (ssCtrl in Shift) and AllowMove then begin
OffsetRect(NewSize, dx, dy);
if KeepInParent then Constrain_Move;
DoMovingEvent;
end;
if (ssShift in Shift) and AllowSize then begin
NewSize.Right := NewSize.Right + dx;
NewSize.Bottom := NewSize.Bottom + dy;
if KeepInParent then Constrain_Size;
DoSizingEvent;
end;
ResizeControl.BoundsRect := NewSize;
ShowSizers;
end;
end;
function TResizer.FindMoverByBuddy(c: TControl): TMover;
var
i : integer;
begin
Result := nil;
for i := 0 to GroupMovers.Count-1 do
if TMover(GroupMovers[i]).Buddy = c then
Result := GroupMovers[i];
Assert(Result <> nil);
end;
end.
这个控件装上去,就能设置控件在程序运行时随意拖动,就象设计时一样,边上还有四个小点
1.在label的OnMouseDown中写label1.BeginDrag(false);
2.在TForm1 OnDragOver中写if Source is TLabel
Accept=true;
3.在Form1的OnDrawDrop中写
Label1.left=x;
Label1.top=y;
如果是Panel或Button,可以用Perform()
void __fastcall TForm1::Panel1MouseDown(TObject *Sender,
TMouseButton Button, TShiftState Shift, int X, int Y)
{
int SC_DragMove=0xF012;
ReleaseCapture();
Panel1->Perform(WM_SYSCOMMAND,SC_DragMove,0);
}