Title: Coordinates of any control
Question: How can I get the coordinates of any Control
-- where the Form does not have to be its Parent --
also have the pupmenu popup on this control
by use of code. Find the mouse-coordinates too
Answer:
Here the pas-file -- unit1.pas
unit Unit1;
{
Get the Coordinates of any Control on the Form, whereas this Control
does not have to have the Form1 itself as its Parent; here, I piut a
Panel (Panel1) or the Form (Form1), on the Panel, I put a second Panel
(Panel2) and finally on this Panel2 I put ComboBox1 of which coordinates
I go for. Also, it shows how to make a PopupMenu appear on that (or any
other of course) Control, by Code (a control, again, that does not have
to have Form(1) as its parent. How to read out the whereaboubt of your cursor
will be shown to you... Omer Yasar Can, Holland/Turkey
}
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, ExtCtrls, Buttons, ComCtrls, Menus;
type
TForm1 = class(TForm)
Panel1: TPanel;
Panel2: TPanel;
ComboBox1: TComboBox;
StatusBar1: TStatusBar;
BitBtn_Cursor: TBitBtn;
BitBtn_cordinatesofanycontrol: TBitBtn;
PopupMenu1: TPopupMenu;
N1st1: TMenuItem;
N2nd1: TMenuItem;
N3rd1: TMenuItem;
procedure BitBtn_CursorClick(Sender: TObject);
procedure BitBtn_cordinatesofanycontrolClick(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.BitBtn_CursorClick(Sender: TObject);
var pt: tpoint;
begin
//give out the actual coordinates of the mouse
GetCursorPos( pt );
pt := ScreenToClient( pt );
StatusBar1.Panels[1].Text := 'Mouse: ' + ' ' +
inttostr ( pt.X ) + ' ' +
inttostr ( pt.Y );
end;
procedure TForm1.BitBtn_cordinatesofanycontrolClick(Sender: TObject);
var popupappearFromLeft,popupappearFromTop: integer;
begin
//give the true coordinates of a control (ComboBox) even if it is not having Form1 as its parent
//hee: Panel1 put on Form1, Panel2 put on Panel1 and ComboBox1 put on Panel2
StatusBar1.Panels[2].Text := 'ComboBox: ' + ' ' +
inttostr ( ComboBox1.ClientOrigin.X - Form1.ClientOrigin.X ) + ' ' +
inttostr ( ComboBox1.ClientOrigin.Y - Form1.ClientOrigin.Y );
//make popupmenu1 appear in the middle of the Control (ComboBox1)
popupappearFromLeft := ComboBox1.Width div 2;
popupappearFromTop := ComboBox1.Height div 2;
PopupMenu1.Popup(
ComboBox1.ClientOrigin.X + popupappearFromLeft,
ComboBox1.ClientOrigin.Y + popupappearFromTop);
end;
end.
Get_Coordinates_of_any_Control.dpr
program Get_Coordinates_of_any_Control;
uses
Forms,
Unit1 in 'Unit1.pas' {Form1};
{$R *.res}
begin
Application.Initialize;
Application.CreateForm(TForm1, Form1);
Application.Run;
end.
--------------------------------
Unit1.dfm
object Form1: TForm1
Left = 358
Top = 409
Width = 550
Height = 380
Caption = 'Delphi-programming -- HOW TO -- Cathegory: Visible/Runtime'
Color = clBtnFace
Font.Charset = DEFAULT_CHARSET
Font.Color = clWindowText
Font.Height = -11
Font.Name = 'MS Sans Serif'
Font.Style = []
OldCreateOrder = False
PixelsPerInch = 96
TextHeight = 13
object Panel1: TPanel
Left = 24
Top = 40
Width = 249
Height = 169
Caption = 'Panel1'
TabOrder = 1
object Panel2: TPanel
Left = 16
Top = 8
Width = 201
Height = 81
Caption = 'Panel2'
TabOrder = 0
object ComboBox1: TComboBox
Left = 24
Top = 48
Width = 145
Height = 21
ItemHeight = 13
TabOrder = 0
Text = 'ComboBox1'
end
end
end
object StatusBar1: TStatusBar
Left = 0
Top = 327
Width = 542
Height = 19
Panels = item
Text = '(Dir:)\Get Coordinates of any Control'
Width = 185
end
item
Text = 'Mouse:'
Width = 100
end
item
Text = 'ComboBox:'
Width = 50
end
end
object BitBtn_Cursor: TBitBtn
Left = 48
Top = 224
Width = 75
Height = 25
Caption = 'Cursor'
TabOrder = 3
OnClick = BitBtn_CursorClick
end
object BitBtn_cordinatesofanycontrol: TBitBtn
Left = 128
Top = 224
Width = 75
Height = 25
Caption = 'Control...'
TabOrder = 0
OnClick = BitBtn_cordinatesofanycontrolClick
end
object PopupMenu1: TPopupMenu
Left = 240
Top = 168
object N1st1: TMenuItem
Caption = '1st'
end
object N2nd1: TMenuItem
Caption = '2nd'
end
object N3rd1: TMenuItem
Caption = '3rd'
end
end
end