Советы по Delphi
Компонент TrayIcon
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unit Trayicon; interface uses SysUtils, Windows, Messages, Classes, Graphics, Controls, ShellAPI, Forms, menus; const WM_TOOLTRAYICON = WM_USER+1; WM_RESETTOOLTIP = WM_USER+2; type TTrayIcon = class(TComponent) private // BDS { для внутреннего пользования } hMapping: THandle; { Набор переменных } IconData: TNOTIFYICONDATA; fIcon : TIcon; fToolTip : String; fWindowHandle : HWND; fActive : boolean; fShowApp : boolean; // Добавлено fSendMsg : string; fShowDesigning : Boolean; { События } fOnClick : TNotifyEvent; fOnDblClick : TNotifyEvent; fOnRightClick : TMouseEvent; fPopupMenu : TPopupMenu; function AddIcon : boolean; function ModifyIcon : boolean; function DeleteIcon : boolean; procedure SetActive(Value : boolean); procedure SetShowApp(Value : boolean); // Добавлено procedure SetShowDesigning(Value : boolean); procedure SetIcon(Value : TIcon); procedure SetToolTip(Value : String); procedure WndProc(var msg : TMessage); procedure FillDataStructure; procedure DoRightClick( Sender : TObject ); protected public FMessageID: DWORD; constructor create(aOwner : TComponent); override; procedure Loaded; override; // Добавлено destructor destroy; override; procedure GoToPreviousInstance; published property Active : boolean read fActive write SetActive; property ShowDesigning : boolean read fShowDesigning write SetShowDesigning; property Icon : TIcon read fIcon write SetIcon; property IDMessage : string read fSendMsg write fSendMsg; property ShowApp : boolean read fShowApp write SetShowApp; // Добавлено property ToolTip : string read fTooltip write SetToolTip; property OnClick : TNotifyEvent read FOnClick write FOnClick; property OnDblClick : TNotifyEvent read FOnDblClick write FOnDblClick; property OnRightClick : TMouseEvent read FOnRightClick write FonRightClick; property PopupMenu : TPopupMenu read fPopupMenu write fPopupMenu; end; procedure Register; type PHWND = ^HWND; implementation {$R TrayIcon.res} procedure TTrayIcon.GoToPreviousInstance; begin PostMessage(hwnd_Broadcast, fMessageID, 0, 0); end; procedure TTrayIcon.SetActive(Value : boolean); begin if value <> fActive then begin fActive := Value; if not (csdesigning in ComponentState) then begin if Value then begin AddIcon; end else begin DeleteIcon; end; end; end; end; procedure TTrayIcon.SetShowApp(Value : boolean); // Добавлено begin if value <> fShowApp then fShowApp := value; if not (csdesigning in ComponentState) then begin if Value then begin ShowWindow(Application.Handle, SW_SHOW); end else begin ShowWindow(Application.Handle, SW_HIDE); end; end; end; procedure TTrayIcon.SetShowDesigning(Value : boolean); begin if csdesigning in ComponentState then begin if value <> fShowDesigning then begin fShowDesigning := Value; if Value then begin AddIcon; end else begin DeleteIcon; end; end; end; end; procedure TTrayIcon.SetIcon(Value : Ticon); begin if Value <> fIcon then begin fIcon.Assign(value); ModifyIcon; end; end; procedure TTrayIcon.SetToolTip(Value : string); begin // Данная программа ВСЕГДА переустанавливает текст подсказки и перезагружает // иконку. Текст может быть пустым в случае первой инициализации компонента. // Без инициализации иконка будет пустой и текст подсказки будет отсутствовать. if length( Value ) > 62 then Value := copy(Value,1,62); fToolTip := value; ModifyIcon; end; constructor TTrayIcon.create(aOwner : Tcomponent); begin inherited create(aOwner); FWindowHandle := AllocateHWnd( WndProc ); FIcon := TIcon.Create; SetShowApp(False); end; destructor TTrayIcon.destroy; begin // BDS CloseHandle(hMapping); if (not (csDesigning in ComponentState) and fActive) or ((csDesigning in ComponentState) and fShowDesigning) then DeleteIcon; FIcon.Free; DeAllocateHWnd( FWindowHandle ); inherited destroy; end; procedure TTrayIcon.Loaded; var // BDS // hMapping: HWND; tmp, tmpID: PChar; begin inherited Loaded; if fSendMsg <> '' then begin GetMem(tmp, Length(fSendMsg) + 1); GetMem(tmpID, Length(fSendMsg) + 1); StrPCopy(tmp, fSendMsg); StrPCopy(tmpID, fSendMsg); fMessageID := RegisterWindowMessage(tmp); FreeMem(tmp); hMapping := CreateFileMapping(HWND($FFFFFFFF), nil, PAGE_READONLY, 0, 32, tmpID); if (hMapping <> NULL) and (GetLastError = ERROR_ALREADY_EXISTS) then begin if not (csDesigning in ComponentState) then begin GotoPreviousInstance; FreeMem(tmpID); halt; end; end; FreeMem(tmpID); end; SetShowApp(fShowApp); end; procedure TTrayIcon.FillDataStructure; begin with IconData do begin cbSize := sizeof(TNOTIFYICONDATA); wnd := FWindowHandle; uID := 0; // определенный приложением идентификатор иконки uFlags := NIF_MESSAGE + NIF_ICON + NIF_TIP; hIcon := fIcon.Handle; StrPCopy(szTip,fToolTip); uCallbackMessage := WM_TOOLTRAYICON; end; end; function TTrayIcon.AddIcon : boolean; begin FillDataStructure; result := Shell_NotifyIcon(NIM_ADD,@IconData); // По неизвестной причине, если не задан текст всплывающей // подсказки, иконка не выводится. Здесь это учтено. if fToolTip = '' then PostMessage( fWindowHandle, WM_RESETTOOLTIP,0,0 ); end; function TTrayIcon.ModifyIcon : boolean; begin FillDataStructure; if fActive then result := Shell_NotifyIcon(NIM_MODIFY,@IconData) else result := True; end; procedure TTrayIcon.DoRightClick( Sender : TObject ); var MouseCo: Tpoint; begin GetCursorPos(MouseCo); if assigned( fPopupMenu ) then begin SetForegroundWindow( Application.Handle ); Application.ProcessMessages; fPopupmenu.Popup( Mouseco.X, Mouseco.Y ); end; if assigned( FOnRightClick ) then begin FOnRightClick(self,mbRight,[],MouseCo.x,MouseCo.y); end; end; function TTrayIcon.DeleteIcon : boolean; begin result := Shell_NotifyIcon(NIM_DELETE,@IconData); end; procedure TTrayIcon.WndProc(var msg : TMessage); begin with msg do if (msg = WM_RESETTOOLTIP) then SetToolTip( fToolTip ) else if (msg = WM_TOOLTRAYICON) then begin case lParam of WM_LBUTTONDBLCLK : if assigned (FOnDblClick) then FOnDblClick(self); WM_LBUTTONUP : if assigned(FOnClick)then FOnClick(self); WM_RBUTTONUP : DoRightClick(self); end; end else // Обработка всех сообщений с дескриптором по умолчанию Result := DefWindowProc(FWindowHandle, Msg, wParam, lParam); end; procedure Register; begin RegisterComponents('Win95', [TTrayIcon]); end; end. |
