这是个系统托盘功能
下面的代码完全符合你的要求
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;
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 Messagedo
begin
{ if it's the tray callback message }
if (Msg = DDGM_TRAYICON) then
begin
TheIcon := TTrayNotifyIcon(WParam);
case lParam of
{ enable timer on first mousedo
wn. }
{ OnClick will be fired by OnTimer method, provided }
{do
uble click has not occurred. }
WM_LBUTTONDOWN: TheIcon.FTimer.Enabled := True;
{ Set no click flag ondo
uble 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 FTimerdo
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 }
{do
uble click. This delays the first click long enough to }
{ ensure that ado
uble 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;
{ ifdo
uble 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 Tnddo
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;
{do
n'tdo
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';
initialization
{ Get a unique windows message ID for tray callback }
DDGM_TRAYICON := RegisterWindowMessage(TrayMsgStr);
IconMgr := TIconManager.Create;
finalization
IconMgr.Free;
end.
