unit TrayIcon; interface uses Windows, SysUtils, Messages, ShellAPI, Classes, Graphics, Forms, Menus, StdCtrls, ExtCtrls; type ENotifyIconError = class(Exception); TTrayNotifyIcon = class(TComponent) private FDefaultIcon: THandle; FIcon: TIcon; FHideTask: Boolean; FHint: string; FIconVisible: Boolean; FPopupMenu: TPopupMenu; FOnClick: TNotifyEvent; FOnDblClick: TNotifyEvent; FNoShowClick: Boolean; FTimer: TTimer; Tnd: TNotifyIconData; procedure SetIcon(Value: TIcon); procedure SetHideTask(Value: Boolean); procedure SetHint(Value: string); procedure SetIconVisible(Value: Boolean); procedure SetPopupMenu(Value: TPopupMenu); procedure SendTrayMessage(Msg: DWORD; Flags: UINT); function ActiveIconHandle: THandle; procedure OnButtonTimer(Sender: TObject); protected procedure Loaded; override; procedure LoadDefaultIcon; virtual; procedure Notification(AComponent: TComponent; Operation: TOperation); override; public constructor Create(AOwner: TComponent); override; destructor Destroy; override; published property Icon: TIcon read FIcon write SetIcon; property HideTask: Boolean read FHideTask write SetHideTask default False; property Hint: String read FHint write SetHint; property IconVisible: Boolean read FIconVisible write SetIconVisible default False; property PopupMenu: TPopupMenu read FPopupMenu write SetPopupMenu; property OnClick: TNotifyEvent read FOnClick write FOnClick; property OnDblClick: TNotifyEvent read FOnDblClick write FOnDblClick; end; Procedure Register; implementation { TIconManager } { This class creates a hidden window which handles and routes } { tray icon messages } type TIconManager = class private FHWindow: HWnd; procedure TrayWndProc(var Message: TMessage); public constructor Create; destructor Destroy; override; property HWindow: HWnd read FHWindow write FHWindow; end; var IconMgr: TIconManager; DDGM_TRAYICON: Cardinal; constructor TIconManager.Create; begin FHWindow := AllocateHWnd(TrayWndProc); end; destructor TIconManager.Destroy; begin if FHWindow <> 0 then DeallocateHWnd(FHWindow); inherited Destroy; end; procedure TIconManager.TrayWndProc(var Message: TMessage); { This allows us to handle all tray callback messages } { from within the context of the component. } var Pt: TPoint; TheIcon: TTrayNotifyIcon; begin with Message do begin { if it's the tray callback message } if (Msg = DDGM_TRAYICON) then begin TheIcon := TTrayNotifyIcon(WParam); case lParam of { enable timer on first mouse down. } { OnClick will be fired by OnTimer method, provided } { double click has not occurred. } WM_LBUTTONDOWN: TheIcon.FTimer.Enabled := True; { Set no click flag on double click. This will supress } { the single click. } WM_LBUTTONDBLCLK: begin TheIcon.FNoShowClick := True; if Assigned(TheIcon.FOnDblClick) then TheIcon.FOnDblClick(Self); end; WM_RBUTTONDOWN: begin if Assigned(TheIcon.FPopupMenu) then begin { Call to SetForegroundWindow is required by API } SetForegroundWindow(IconMgr.HWindow); { Popup local menu at the cursor position. } GetCursorPos(Pt); TheIcon.FPopupMenu.Popup(Pt.X, Pt.Y); { Message post required by API to force task switch } PostMessage(IconMgr.HWindow, WM_USER, 0, 0); end; end; end; end else { If it isn't a tray callback message, then call DefWindowProc } Result := DefWindowProc(FHWindow, Msg, wParam, lParam); end; end; { TTrayNotifyIcon } constructor TTrayNotifyIcon.Create(AOwner: TComponent); begin inherited Create(AOwner); FIcon := TIcon.Create; FTimer := TTimer.Create(Self); with FTimer do begin Enabled := False; Interval := GetDoubleClickTime; OnTimer := OnButtonTimer; end; { Keep default windows icon handy... } LoadDefaultIcon; end; destructor TTrayNotifyIcon.Destroy; begin if FIconVisible then SetIconVisible(False); // destroy icon FIcon.Free; // free stuff FTimer.Free; inherited Destroy; end; function TTrayNotifyIcon.ActiveIconHandle: THandle; { Returns handle of active icon } begin { If no icon is loaded, then return default icon } if (FIcon.Handle <> 0) then Result := FIcon.Handle else Result := FDefaultIcon; end; procedure TTrayNotifyIcon.LoadDefaultIcon; { Loads default window icon to keep it handy. } { This will allow the component to use the windows logo } { icon as the default when no icon is selected in the } { Icon property. } begin FDefaultIcon := LoadIcon(0, IDI_WINLOGO); end; procedure TTrayNotifyIcon.Loaded; { Called after component is loaded from stream } begin inherited Loaded; { if icon is supposed to be visible, create it. } if FIconVisible then SendTrayMessage(NIM_ADD, NIF_MESSAGE or NIF_ICON or NIF_TIP); end; procedure TTrayNotifyIcon.Notification(AComponent: TComponent; Operation: TOperation); begin inherited Notification(AComponent, Operation); if (Operation = opRemove) and (AComponent = PopupMenu) then PopupMenu := nil; end; procedure TTrayNotifyIcon.OnButtonTimer(Sender: TObject); { Timer used to keep track of time between two clicks of a } { double click. This delays the first click long enough to } { ensure that a double click hasn't occurred. The whole } { point of these gymnastics is to allow the component to } { receive OnClicks and OnDblClicks independently. } begin { Disable timer because we only want it to fire once. } FTimer.Enabled := False; { if double click has not occurred, then fire single click. } if (not FNoShowClick) and Assigned(FOnClick) then FOnClick(Self); FNoShowClick := False; // reset flag end; procedure TTrayNotifyIcon.SendTrayMessage(Msg: DWORD; Flags: UINT); { This method wraps up the call to the API's Shell_NotifyIcon } begin { Fill up record with appropriate values } with Tnd do begin cbSize := SizeOf(Tnd); StrPLCopy(szTip, PChar(FHint), SizeOf(szTip)); uFlags := Flags; uID := UINT(Self); Wnd := IconMgr.HWindow; uCallbackMessage := DDGM_TRAYICON; hIcon := ActiveIconHandle; end; Shell_NotifyIcon(Msg, @Tnd); end; procedure TTrayNotifyIcon.SetHideTask(Value: Boolean); { Write method for HideTask property } const { Flags to show application normally or hide it } ShowArray: array[Boolean] of integer = (sw_ShowNormal, sw_Hide); begin if FHideTask <> Value then begin FHideTask := Value; { Don't do anything in design mode } if not (csDesigning in ComponentState) then ShowWindow(Application.Handle, ShowArray[FHideTask]); end; end; procedure TTrayNotifyIcon.SetHint(Value: string); { Set method for Hint property } begin if FHint <> Value then begin FHint := Value; if FIconVisible then { Change hint on icon on tray notification area } SendTrayMessage(NIM_MODIFY, NIF_TIP); end; end; procedure TTrayNotifyIcon.SetIcon(Value: TIcon); { Write method for Icon property. } begin FIcon.Assign(Value); // set new icon { Change icon on notification tray } if FIconVisible then SendTrayMessage(NIM_MODIFY, NIF_ICON); end; procedure TTrayNotifyIcon.SetIconVisible(Value: Boolean); { Write method for IconVisible property } const { Flags to add or delete a tray notification icon } MsgArray: array[Boolean] of DWORD = (NIM_DELETE, NIM_ADD); begin if FIconVisible <> Value then begin FIconVisible := Value; { Set icon as appropriate } SendTrayMessage(MsgArray[Value], NIF_MESSAGE or NIF_ICON or NIF_TIP); end; end; procedure TTrayNotifyIcon.SetPopupMenu(Value: TPopupMenu); { Write method for PopupMenu property } begin FPopupMenu := Value; if Value <> nil then Value.FreeNotification(Self); end; const { String to identify registered window message } TrayMsgStr = 'DDG.TrayNotifyIconMsg'; Procedure Register; Begin {** antTaskbarIcon unit **} RegisterComponents('TrayNotifyIcon', [TTrayNotifyIcon]); End;{Procedure Register} initialization { Get a unique windows message ID for tray callback } DDGM_TRAYICON := RegisterWindowMessage(TrayMsgStr); IconMgr := TIconManager.Create; finalization IconMgr.Free; end.