www.pudn.com > shijiantongbu.zip > Trayicon.pas
{ TTrayIcon VCL. Version 1.3
Requires: Delphi 2.0 32 bit.
Function: Adds an icon to the Windows 95 Tool Tray and
has events to respond to mouse clicks.
This component is based on the TToolIcon VCL that was written by
Derek Stutsman (dereks@metronet.com). He based his component on
TWinControl, so it showed up as a clear, blank, resizable window at
design time and also had more properties than the component actually
needed. This made it really hard to find on a busy form sometimes.
I changed it so it would be based on TComponent so that it was readily
visible at design time and also did not cover anything at run-time.
The additional Top, left, width, etc. properties are also no longer
necessary. I added a ShowDesigning property so that you could test
it at design time, but then turn it off so that TWO icons weren't shown
on the tool tray when developing and testing.
One strange anomaly that I worked around but don't know why it happens -
if a ToolTip is not specified, then at run-time the icon shows up as
blank. If a ToolTip is specified, everything works fine. To fix this,
I set up another windows message that set the tool tip if it was blank -
this ensures proper operation at all times, but I don't know why this
is necessary. If you can figure it out, send me some mail and let me
know! (4/17/96 note - still no solution for this!)
This is freeware (as was the original). If you make cool changes to it,
please send them to me.
Enjoy!
Pete Ness
Compuserve ID: 102347,710
Internet: 102347.710@compuserve.com
http:\\ourworld.compuserve.com\homepages\peteness
Release history:
3/8/96 - Version 1.0
Release by Derek Stutsman of TToolIcon version 1.0
3/12/96 - Version 1.1
Changed as outlined above by me (Pete Ness) and renamed to TTrayIcon.
3/29/96 - Version 1.2
Add default window handling to allow closing when Win95 shutdown.
Previously, you had to manually close your application before closing
Windows 95.
4/17/96 - Version 1.3
Added a PopupMenu property to automatically handle right clicking on
the tray icon.
Fixed bug that would not allow you to instantiate a TTrayIcon instance
at run-time.
Added an example program to show how to do some of the things I've
gotten the most questions on.
This version is available from my super lame web page - see above for
the address.
}
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
{ Field Variables }
IconData: TNOTIFYICONDATA;
fIcon : TIcon;
fToolTip : String;
fWindowHandle : HWND;
fActive : boolean;
fShowDesigning : Boolean;
{ Events }
fOnClick : TNotifyEvent;
fOnDblClick : TNotifyEvent;
fOnRightClick : TMouseEvent;
fPopupMenu : TPopupMenu;
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;
procedure DoRightClick( Sender : TObject );
protected
public
constructor create(aOwner : TComponent); override;
destructor destroy; override;
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;
property PopupMenu : TPopupMenu read fPopupMenu write fPopupMenu;
end;
procedure Register;
implementation
{$R TrayIcon.res}
procedure TTrayIcon.SetActive(Value : boolean);
begin
if value <> fActive then begin
fActive := Value;
if not (csdesigning in ComponentState) then begin
if Value then begin
AddIcon;
end else begin
DeleteIcon;
end;
end;
end;
end;
procedure TTrayIcon.SetShowDesigning(Value : boolean);
begin
if csdesigning in ComponentState then begin
if value <> fShowDesigning then begin
fShowDesigning := Value;
if Value then begin
AddIcon;
end else begin
DeleteIcon;
end;
end;
end;
end;
procedure TTrayIcon.SetIcon(Value : Ticon);
begin
if Value <> fIcon then
begin
fIcon.Assign(value);
ModifyIcon;
end;
end;
procedure TTrayIcon.SetToolTip(Value : string);
begin
// This routine ALWAYS re-sets the field value and re-loads the
// icon. This is so the ToolTip can be set blank when the component
// is first loaded. If this is changed, the icon will be blank on
// the tray when no ToolTip is specified.
if length( Value ) > 62 then
Value := copy(Value,1,62);
fToolTip := value;
ModifyIcon;
end;
constructor TTrayIcon.create(aOwner : Tcomponent);
begin
inherited create(aOwner);
FWindowHandle := {$WARNINGS OFF} AllocateHWnd( WndProc ); {$WARNINGS ON}
FIcon := TIcon.Create;
end;
destructor TTrayIcon.destroy;
begin
if (not (csDesigning in ComponentState) and fActive)
or ((csDesigning in ComponentState) and fShowDesigning) then
DeleteIcon;
FIcon.Free;
{$WARNINGS OFF} DeAllocateHWnd( FWindowHandle ); {$WARNINGS ON}
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;
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 // Handle all messages with the default handler
Result := DefWindowProc(FWindowHandle, Msg, wParam, lParam);
end;
procedure Register;
begin
RegisterComponents('Win95', [TTrayIcon]);
end;
end.