The ShellAPI provides the function Shell_NotifyIcon to add or remove a button.
You can pass a user defined message (called WM_TBBUTTON in the sample code) which will be sent to your form each time your new button in the task bar gets a mouse event.
Here are the code snippets to do just that!
uses
ShellAPI;
const
WM_TBBUTTON = WM_USER + 100;
// .. form definition..
procedure TForm1.IconCallBackMessage( var Mess : TMessage );
message WM_TBBUTTON;
// .. implementation part..
procedure TForm1.FormCreate(Sender: TObject);
var
NotifyID : TNotifyIconData;
begin
with NotifyID do
begin
cbSize := SizeOf(TNotifyIconData);
Wnd := Form1.Handle;
uID := 1;
uFlags := NIF_ICON or NIF_MESSAGE or NIF_TIP;
uCallbackMessage := WM_TBBUTTON;
hIcon := Application.Icon.Handle;
szTip := 'This is the hint!';
end;
Shell_NotifyIcon(NIM_ADD, @NotifyID);
end;
procedure TForm1.FormClose(Sender: TObject;
var Action: TCloseAction);
var
NotifyID : TNotifyIconData;
begin
with NotifyID do
begin
// setting the record is probably
// not needed for deleting
cbSize := SizeOf(TNotifyIconData);
Wnd := Form1.Handle;
uID := 1;
uFlags := NIF_ICON or NIF_MESSAGE or NIF_TIP;
uCallbackMessage := WM_TBBUTTON;
hIcon := Application.Icon.Handle;
szTip := 'This is the hint!';
end;
Shell_NotifyIcon(NIM_DELETE, @NotifyID);
end;
procedure TForm1.IconCallBackMessage(var Mess : TMessage);
begin
// do whatever you wish here.
// for example popup up a menu on a right click.
case Mess.lParam of
WM_LBUTTONDBLCLK : ShowMessage('Left Double Click');
WM_LBUTTONDOWN : ShowMessage('Left Down');
WM_LBUTTONUP : ShowMessage('Left Up');
WM_MBUTTONDBLCLK : ShowMessage('M Dbl');
WM_MBUTTONDOWN : ShowMessage('M D');
WM_MBUTTONUP : ShowMessage('M U');
WM_MOUSEMOVE : ShowMessage('Mouse movement');
WM_MOUSEWHEEL : ShowMessage('Mouse wheel');
WM_RBUTTONDBLCLK : ShowMessage('r dbl');
WM_RBUTTONDOWN : ShowMessage('r down');
WM_RBUTTONUP : ShowMessage('r up');
end;
end;