Title: How to create a TrayIcon !
Question: Since there is no article so far about how to build a trayicon here on delphi3000, i post this small but working component that a once found on the net !
Answer:
I just added the line
SetWindowLong(Application.Handle, GWL_EXSTYLE, WS_EX_TOOLWINDOW);
in the contructor - so that the application is not shown in the task-bar !
unit TrayIcon;
interface
uses
SysUtils, Windows, Messages, Classes, Graphics, Controls, ShellAPI,
Forms;
const WM_TOOLTRAYICON = WM_USER+1;
WM_RESETTOOLTIP = WM_USER+2;
type
TTrayIcon = class(TComponent)
private
{ Field Variables }
IconData: TNOTIFYICONDATA;
fIcon : TIcon;
fToolTip : String;
fWindowHandle : HWND;
fActive : boolean;
fShowDesigning : Boolean;
{ Events }
fOnClick : TNotifyEvent;
fOnDblClick : TNotifyEvent;
fOnRightClick : TMouseEvent;
function AddIcon : boolean;
function ModifyIcon : boolean;
function DeleteIcon : boolean;
procedure SetActive(Value : boolean);
procedure SetShowDesigning(Value : boolean);
procedure SetIcon(Value : TIcon);
procedure SetToolTip(Value : String);
procedure WndProc(var msg : TMessage);
procedure FillDataStructure;
protected
constructor create(aOwner : TComponent); override;
destructor destroy; override;
public
published
property Active : boolean read fActive write SetActive;
property ShowDesigning : boolean read fShowDesigning write SetShowDesigning;
property Icon : TIcon read fIcon write SetIcon;
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;
end;
procedure Register;
implementation
{$R TrayIcon.res}
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.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
// This routine ALWAYS re-sets the field value and re-loads the
// icon. This is so the ToolTip can be set blank when the component
// is first loaded. If this is changed, the icon will be blank on
// the tray when no ToolTip is specified.
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;
SetWindowLong(Application.Handle, GWL_EXSTYLE, WS_EX_TOOLWINDOW);
end;
destructor TTrayIcon.destroy;
begin
if (not (csDesigning in ComponentState) and fActive)
or ((csDesigning in ComponentState) and fShowDesigning) then
DeleteIcon;
FIcon.Free;
DeAllocateHWnd( FWindowHandle );
inherited destroy;
end;
procedure TTrayIcon.FillDataStructure;
begin
with IconData do
begin
cbSize := sizeof(TNOTIFYICONDATA);
wnd := FWindowHandle;
uID := 0; // is not passed in with message so make it 0
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);
// For some reason, if there is no tool tip set up, then the icon
// doesn't display. This fixes that.
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;
function TTrayIcon.DeleteIcon : boolean;
begin
result := Shell_NotifyIcon(NIM_DELETE,@IconData);
end;
procedure TTrayIcon.WndProc(var msg : TMessage);
var MouseCo: TPoint;
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 : if assigned (FOnRightClick)then
begin
GetCursorPos(MouseCo);
FOnRightClick(self,mbRight,[],
MouseCo.x, MouseCo.y);
end;
end;
end
else // Handle all messages with the default handler
Result := DefWindowProc(FWindowHandle, Msg, wParam, lParam);
end;
procedure Register;
begin
RegisterComponents('Win32', [TTrayIcon]);
end;
end.