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Minimize to system tray

Posted on 1997-09-15
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I need source code for Delphi 3 to minimize an application to the system tray
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Question by:carceri
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joseramos earned 20 total points
ID: 1344949
Here's the TrayIcon.pas unit. This unit can be downloaded from some of the Delphi forums ...
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unit TrayIcon;

interface

{ A component to make it easier to create a system tray icon.
  Drop this component on a form, and the application automatically
  becomes a tray icon. This means that when the application is
  minimized, it does not minimize to a normal taskbar icon, but
  to the little system tray on the side of the taskbar. A popup
  menu is available from the system tray icon, and your application
  can process mouse events as the user moves the mouse over
  the system tray icon, clicks on the icon, etc.

  Copyright © 1996 Tempest Software. All rights reserved.
  You may use this software in an application without fee or royalty,
  provided this copyright notice remains intact.
}

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

{ This message is sent to the special, hidden window for shell
  notification messages. Only derived classes might need to
  know about it. }
const
  Wm_Callback_Message = Wm_User + 1;

type
  TTrayIcon = class(TComponent)
  private
    fData: TNotifyIconData;
    fIcon: TIcon;
    fHint: string;
    fPopupMenu: TPopupMenu;
    fClicked: Boolean;
    fOnClick: TNotifyEvent;
    fOnDblClick: TNotifyEvent;
    fOnMinimize: TNotifyEvent;
    fOnMouseMove: TMouseMoveEvent;
    fOnMouseDown: TMouseEvent;
    fOnMouseUp: TMouseEvent;
    fOnRestore: TNotifyEvent;
  protected
    procedure SetHint(const Hint: string); virtual;
    procedure SetIcon(Icon: TIcon); virtual;
    procedure AppMinimize(Sender: TObject);
    procedure AppRestore(Sender: TObject);
    procedure DoMenu; virtual;
    procedure Click; virtual;
    procedure DblClick; virtual;
    procedure EndSession; virtual;
    procedure DoMouseMove(Shift: TShiftState; X, Y: Integer); virtual;
    procedure DoMouseDown(Button: TMouseButton; Shift: TShiftState; X, Y: Integer); virtual;
    procedure DoMouseUp(Button: TMouseButton; Shift: TShiftState; X, Y: Integer); virtual;
    procedure OnMessage(var Msg: TMessage); virtual;
    procedure Changed; virtual;
    property Data: TNotifyIconData read fData;
  public
    constructor Create(Owner: TComponent); override;
    destructor Destroy; override;
    procedure Minimize; virtual;
    procedure Restore; virtual;
  published
    property Hint: string read fHint write SetHint;
    property Icon: TIcon read fIcon write SetIcon;
    property PopupMenu: TPopupMenu read fPopupMenu write fPopupMenu;
    property OnClick: TNotifyEvent read fOnClick write fOnClick;
    property OnDblClick: TNotifyEvent read fOnDblClick write fOnDblClick;
    property OnMinimize: TNotifyEvent read fOnMinimize write fOnMinimize;
    property OnMouseMove: TMouseMoveEvent read fOnMouseMove write fOnMouseMove;
    property OnMouseDown: TMouseEvent read fOnMouseDown write fOnMouseDown;
    property OnMouseUp: TMouseEvent read fOnMouseUp write fOnMouseUp;
    property OnRestore: TNotifyEvent read fOnRestore write fOnRestore;
  end;

procedure Register;

implementation

{ Create the component. At run-time, automatically add a tray icon
  with a callback to a hidden window. Use the application icon and title. }
constructor TTrayIcon.Create(Owner: TComponent);
begin
  inherited Create(Owner);
  fIcon := TIcon.Create;
  fIcon.Assign(Application.Icon);
  if not (csDesigning in ComponentState) then
  begin
    FillChar(fData, SizeOf(fData), 0);
    fData.cbSize := SizeOf(fData);
    fData.Wnd := AllocateHwnd(OnMessage);
    fData.hIcon := Icon.Handle;
    StrPLCopy(fData.szTip, Application.Title, SizeOf(fData.szTip)-1);
    fData.uFlags := Nif_Icon or Nif_Message;
    if Application.Title <> '' then
      fData.uFlags := fData.uFlags or Nif_Tip;
    fData.uCallbackMessage := Wm_Callback_Message;
    if not Shell_NotifyIcon(Nim_Add, @fData) then
      raise EOutOfResources.Create('Cannot create shell notification icon');
    { Replace the application's minimize and restore handlers with
      special ones for the tray. The TrayIcon component has its own
      OnMinimize and OnRestore events that the user can set. }
    Application.OnMinimize := AppMinimize;
    Application.OnRestore := AppRestore;
  end;
end;

{ Remove the icon from the system tray.}
destructor TTrayIcon.Destroy;
begin
  fIcon.Free;
  if not (csDesigning in ComponentState) then
    Shell_NotifyIcon(Nim_Delete, @fData);
  inherited Destroy;
end;

{ Whenever any information changes, update the system tray. }
procedure TTrayIcon.Changed;
begin
  if not (csDesigning in ComponentState) then
    Shell_NotifyIcon(Nim_Modify, @fData);
end;

{ When the Application is minimized, minimize to the system tray.}
procedure TTrayIcon.AppMinimize(Sender: TObject);
begin
  Minimize
end;

{ When restoring from the system tray, restore the application. }
procedure TTrayIcon.AppRestore(Sender: TObject);
begin
  Restore
end;

{ Message handler for the hidden shell notification window.
  Most messages use Wm_Callback_Message as the Msg ID, with
  WParam as the ID of the shell notify icon data. LParam is
  a message ID for the actual message, e.g., Wm_MouseMove.
  Another important message is Wm_EndSession, telling the
  shell notify icon to delete itself, so Windows can shut down.

  Send the usual Delphi events for the mouse messages. Also
  interpolate the OnClick event when the user clicks the
  left button, and popup the menu, if there is one, for
  right click events. }

procedure TTrayIcon.OnMessage(var Msg: TMessage);
  { Return the state of the shift keys. }
  function ShiftState: TShiftState;
  begin
    Result := [];
    if GetKeyState(Vk_Shift) < 0 then
      Include(Result, ssShift);
    if GetKeyState(Vk_Control) < 0 then
      Include(Result, ssCtrl);
    if GetKeyState(Vk_Menu) < 0 then
      Include(Result, ssAlt);
  end;

var
  Pt: TPoint;
  Shift: TShiftState;
begin
  case Msg.Msg of
  Wm_QueryEndSession:
    Msg.Result := 1;
  Wm_EndSession:
    if TWmEndSession(Msg).EndSession then
      EndSession;
  Wm_Callback_Message:
    case Msg.lParam of
    Wm_MouseMove:
      begin
        Shift := ShiftState;
        GetCursorPos(Pt);
        DoMouseMove(Shift, Pt.X, Pt.Y);
      end;
    Wm_LButtonDown:
      begin
        Shift := ShiftState + [ssLeft];
        GetCursorPos(Pt);
        DoMouseDown(mbLeft, Shift, Pt.X, Pt.Y);
        fClicked := True;
      end;
    Wm_LButtonUp:
      begin
        Shift := ShiftState + [ssLeft];
        GetCursorPos(Pt);
        if fClicked then
        begin
          fClicked := False;
          Click;
        end;
        DoMouseUp(mbLeft, Shift, Pt.X, Pt.Y);
      end;
    Wm_LButtonDblClk:
      DblClick;
    Wm_RButtonDown:
      begin
        Shift := ShiftState + [ssRight];
        GetCursorPos(Pt);
        DoMouseDown(mbRight, Shift, Pt.X, Pt.Y);
        DoMenu;
      end;
    Wm_RButtonUp:
      begin
        Shift := ShiftState + [ssRight];
        GetCursorPos(Pt);
        DoMouseUp(mbRight, Shift, Pt.X, Pt.Y);
      end;
    Wm_RButtonDblClk:
      DblClick;
    Wm_MButtonDown:
      begin
        Shift := ShiftState + [ssMiddle];
        GetCursorPos(Pt);
        DoMouseDown(mbMiddle, Shift, Pt.X, Pt.Y);
      end;
    Wm_MButtonUp:
      begin
        Shift := ShiftState + [ssMiddle];
        GetCursorPos(Pt);
        DoMouseUp(mbMiddle, Shift, Pt.X, Pt.Y);
      end;
    Wm_MButtonDblClk:
      DblClick;
    end;
  end;
end;

{ Set a new hint, which is the tool tip for the shell icon. }
procedure TTrayIcon.SetHint(const Hint: string);
begin
  if fHint <> Hint then
  begin
    fHint := Hint;
    StrPLCopy(fData.szTip, Hint, SizeOf(fData.szTip)-1);
    if Hint <> '' then
      fData.uFlags := fData.uFlags or Nif_Tip
    else
      fData.uFlags := fData.uFlags and not Nif_Tip;
    Changed;
  end;
end;

{ Set a new icon. Update the system tray. }
procedure TTrayIcon.SetIcon(Icon: TIcon);
begin
  if fIcon <> Icon then
  begin
    fIcon.Assign(Icon);
    fData.hIcon := Icon.Handle;
    Changed;
  end;
end;

{ When the user right clicks the icon, call DoMenu.
  If there is a popup menu, and if the window is minimized,
  then popup the menu. }
procedure TTrayIcon.DoMenu;
var
  Pt: TPoint;
begin
  if (fPopupMenu <> nil) and not IsWindowVisible(Application.Handle) then
  begin
    GetCursorPos(Pt);
    fPopupMenu.Popup(Pt.X, Pt.Y);
  end;
end;

procedure TTrayIcon.Click;
begin
  if Assigned(fOnClick) then
    fOnClick(Self);
end;

procedure TTrayIcon.DblClick;
begin
  if Assigned(fOnDblClick) then
    fOnDblClick(Self);
end;

procedure TTrayIcon.DoMouseMove(Shift: TShiftState; X, Y: Integer);
begin
  if Assigned(fOnMouseMove) then
    fOnMouseMove(Self, Shift, X, Y);
end;

procedure TTrayIcon.DoMouseDown(Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
begin
  if Assigned(fOnMouseDown) then
    fOnMouseDown(Self, Button, Shift, X, Y);
end;

procedure TTrayIcon.DoMouseUp(Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
begin
  if Assigned(fOnMouseUp) then
    fOnMouseUp(Self, Button, Shift, X, Y);
end;

{ When the application minimizes, hide it, so only the icon
  in the system tray is visible. }
procedure TTrayIcon.Minimize;
begin
  ShowWindow(Application.Handle, Sw_Hide);
  if Assigned(fOnMinimize) then
    fOnMinimize(Self);
end;

{ Restore the application by making its window visible again,
  which is a little weird since its window is invisible, having
  no height or width, but that's what determines whether the button
  appears on the taskbar. }
procedure TTrayIcon.Restore;
begin
  ShowWindow(Application.Handle, Sw_Restore);
  if Assigned(fOnRestore) then
    fOnRestore(Self);
end;

{ Allow Windows to exit by deleting the shell notify icon. }
procedure TTrayIcon.EndSession;
begin
  Shell_NotifyIcon(Nim_Delete, @fData);
end;

procedure Register;
begin
  RegisterComponents('Tempest', [TTrayIcon]);
end;

end.
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