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How declare global MouseDown event?

Posted on 1997-07-19
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Last Modified: 2010-04-03
Hi!

I'm developing an application with several forms all having similar appearance. On these forms there are a couple of panels. The problem: When I press the mouse button on any of these panels (located on different forms) I want the OnMouseDown event for each panel to call the same handler procedure which is located in the application's main unit. How should I do this? I haven't managed to declare the procedure in such a way that the program compiles correctly.
Please help, thanks.
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Question by:Dippen
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by:
ronit051397 earned 200 total points
ID: 1339282
1. Create a project with 2 forms: fMain, Form2.
2. On the project file write:
program test1;

uses
  Forms,
  uMain in 'uMain.pas' {fMain},
  u2 in 'u2.pas' {Form2};

{$R *.RES}

begin
  Application.Initialize;
  Application.CreateForm(TfMain, fMain);
  Application.Run;
end.

3. On the mainform create a button and create a procedure which moves panels, as follows:

unit uMain;

interface

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

type
  TfMain = class(TForm)
    Button1: TButton;
    Procedure MovePanel(FObject: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  fMain: TfMain;

implementation
uses u2;
{$R *.DFM}

Procedure TfMain.MovePanel(FObject: TObject);
begin
  with TPanel(FObject) do
  begin
    ReleaseCapture;
    Perform(WM_SysCommand, $F012, 0);
  end;
end;

procedure TfMain.Button1Click(Sender: TObject);
begin
  Application.Createform(TForm2,Form2);
  Form2.ShowModal;
end;

end.
4. On the second form place 2 panels and write:
unit u2;

interface

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

type
  TForm2 = class(TForm)
    Panel1: TPanel;
    Panel2: TPanel;
    procedure Panel1MouseDown(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
    procedure Panel2MouseDown(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form2: TForm2;

implementation

uses uMain;

{$R *.DFM}

procedure TForm2.Panel1MouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
  fMain.MovePanel(Sender);
end;

procedure TForm2.Panel2MouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
  fMain.MovePanel(Sender);
end;

end.
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