Delphi 7: Ikon minden ablaknak a Tálcán

Taken from Delphi3000.com by Marc Hoffmann

Question/Problem/Abstract:
I would like to add some Windows’ Taskbar-Buttons for dynamic created forms w/o loosing the ability to ‘re-focus’ the MainForm by clicking it’s own button.

Answer:
The following example uses a Button (Button1)to dynamic create forms at runtime. Each form will be accessable via a corresponding Button placed on the
Taskbar. You had to include the WMSysCommand method to enable the real “look&feel” of minimizing the MainForm. Otherwise, the MainForm will be minimized to the lower left side of the Screen or will be hidden in the background, so it’s not possible to restore it correctly.
If you want to minimize (or hide) all subforms when minimizing the MainForm, you had to iterate through all registered subforms and hide them manualy. I don’t know a better way right now, but if you’ve found any solution…:-)

MainForm Unit

unit MainForm;

interface

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

type TMainForm = class(TForm) Button1: TButton;
 procedure FormCreate(Sender: TObject);
 procedure Button1Click(Sender: TObject);
 private { Private declarations }
 procedure WMSysCommand(var Msg: TMessage); message WM_SYSCOMMAND;
 public { Public declarations }
 procedure CreateParams(var Params: TCreateParams); override;
end;

var MainForm: TMainForm;

implementation

{$R *.DFM}

uses SubForm;

var SubForm: TSubForm;

procedure TMainForm.FormCreate(Sender: TObject);
 begin
 SetWindowLong(Application.Handle, GWL_EXSTYLE, GetWindowLong(Application.Handle, GWL_EXSTYLE)or WS_EX_TOOLWINDOW and not WS_EX_APPWINDOW);
end;

procedure TMainForm.CreateParams(var Params: TCreateParams);
 begin
 inherited CreateParams(Params);
 Params.ExStyle := Params.ExStyle or WS_EX_APPWINDOW and not WS_EX_TOOLWINDOW;
end;

procedure TMainForm.WMSysCommand(var Msg: TMessage);
 begin
 DefaultHandler(Msg);
end;

procedure TMainForm.Button1Click(Sender: TObject);
 begin
 SubForm := TSubForm.Create(Application); SubForm.Show; end;
end.

SubForm Unit

unit SubForm;

interface

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

type TSubForm = class(TForm)
 procedure FormClose(Sender: TObject; var Action: TCloseAction);
 private { Private declarations }
 public { Public declarations }
 procedure CreateParams(var Params: TCreateParams); override;
end;

implementation

{$R *.DFM}

procedure TSubForm.CreateParams(var Params: TCreateParams);
begin
  inherited CreateParams(Params);
  Params.ExStyle := Params.ExStyle or WS_EX_APPWINDOW;
end;

procedure TSubForm.FormClose(Sender: TObject; var Action: TCloseAction);
 begin
 Action := caFree;
 end;
end.

Forrás

Kiegészítés:

procedure TSubForm.CreateParams(var Params: TCreateParams);
begin
  inherited CreateParams(Params);
  Params.ExStyle := Params.ExStyle or WS_EX_APPWINDOW;
  {Avoid bringing the mainform to front on hint, on dialog, etc. (Override CreateParams of the mainform, too)}
  Params.WndParent:=GetDesktopwindow;
end;

Forrás

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