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Moving Controls over the form Turn on/off line numbers in source code. Switch to Orginial background IDE or DSP color Comment or reply to this aritlce/tip for discussion. Bookmark this article to my favorite article(s). Print this article
02-Jun-03
Category
VCL-General
Language
Delphi 2.x
Views
94
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Publisher:
DSP, Administrator
Reference URL:
DKB
			Author: Boris Benjamin Wittfoth

How is it possiple to move an control over the form ?

Answer:

It's very simple - so don't try to write hundreds of lines to solve this problem 

Just take a look at this small source-snip 

All what we need to do is to override the dynamic MouseDown method of the 
TControl-BaseClass and fire an WM_SysCommand event with the magicKey $F012. 

I hope this article is helpful for you

1   {--------------------------------------------------------------------------
2   ---
3   
4   hEaDRoOm Development
5   29.10.2002
6   
7   Unit Name: HREdit
8   Author:    Benjamin Benjamin Wittfoth
9   Purpose:
10  History:
11  -----------------------------------------------------------------------------}
12  unit HREdit;
13  
14  interface
15  
16  uses
17    Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
18    StdCtrls;
19  
20  type
21    THREdit = class(TEdit)
22    private
23      fDragable: Boolean;
24    protected
25      procedure MouseDown(Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
26        override;
27    public
28      constructor Create(AOwner: TComponent); override;
29      destructor Destroy; override;
30    published
31      property Dragable: Boolean read fDragable write fDragable;
32    end;
33  
34  procedure register;
35  
36  implementation
37  
38  procedure register;
39  begin
40    RegisterComponents('HEADROOM DEVELOPMENT', [THREdit]);
41  end;
42  
43  { THREdit }
44  
45  constructor THREdit.Create(AOwner: TComponent);
46  begin
47    inherited Create(AOwner);
48  end;
49  
50  destructor THREdit.Destroy;
51  begin
52    inherited;
53  end;
54  
55  procedure THREdit.MouseDown(Button: TMouseButton; Shift: TShiftState; X,
56    Y: Integer);
57  const
58    SC_DragMove = $F012; // important key  !!
59  begin
60    inherited;
61    if assigned(onMouseDown) then
62      OnMouseDown(self, Button, Shift, x, y);
63    if fDragable then
64    begin
65      ReleaseCapture;
66      (self as TControl).perform(WM_SysCommand, SC_DragMove, 0); // this is the key !
67    end;
68  end;
69  
70  end.
71  
72  if you put then next line after ReleaseCapture; the object will even come to the 
73  front before moving it and not just after. 
74  
75  (self as TControl).BringToFront;
76  
77  Cordinates of control. Simply use an Timer on your form - i know this is not 
78  elegant, but it works. 
79  
80  procedure TForm1.TimerTimer(Sender: TObject);
81  begin
82    Edit1.text := inttostr(Edit1.Left) + '/' + inttostr(Edit1.top);
83  end;


			
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