{------------------------------------------------- -----------------------------}
{ Unit name: TrayIcon.pas/t/t/t/t/t/t/t }
{/t/t/t/t/t/t/t/t/t/t/t/t }
{ Unit author: savetime ([email protected], http://savetime.delphhibbs.com) }
{ Created date: 2004-11-13 12:20:54/t/t/t/t/t/t/t}
{/t/t/t/t/t/t/t/t/t/t/t/t }
{ Function introduction:/t/t/t/t/t/t/t/t/t }
{Encapsulate most of the functions of Shell_NotifyIcon and add some common applications /t/t }
{/t/t/t/t/t/t/t/t/t/t/t/t }
{ Instructions for use:/t/t/t/t/t/t/t/t }
{ If the OnDblClick event is set, the response time of onClick will increase GetDoubleClickTime. }
{ Otherwise, onClick will be executed immediately./t/t/t/t/t/t/t}
{ If the Icon is not set, the Application icon will be used./t/t/t }
{/t/t/t/t/t/t/t/t/t/t/t/t }
{ Update history:/t/t/t/t/t/t/t/t/t }
{ When the right-click menu pops up, clicking on another location cannot close the menu. Solution: /t/t/t}
{ Add: SetForegroundWindow(FWindow); before the pop-up menu is displayed./t/t }
{/t/t/t/t/t/t/t/t/t/t/t/t }
{ Existing problems:/t/t/t/t/t/t/t/t/t }
{For the time being, only Win95 Shell style is supported, and the new version 5.0 function is added to /t/t later}
{DoubleClick interval time should be updated as system settings change./t/t/t }
{When clicking TrayIcon, you should set whether to bring the application to the foreground./t/t/t }
{/t/t/t/t/t/t/t/t/t/t/t/t }
{------------------------------------------------- -----------------------------}
unit TrayIcon;
interface
uses SysUtils, Classes, Graphics, Controls, Windows, Messages, Forms, Menus,
ExtCtrls, ShellAPI;
type
//================================================ =========================================
// TTrayIcon class
//================================================ =========================================
TTrayIcon = class(TComponent)
Private
FWindow: HWND;
FHint: string;
FIcon: TIcon;
FActive: Boolean;
FonClick: TNotifyEvent;
FOnDblClick: TNotifyEvent;
FPopupMenu: TPopupMenu;
FClickTimer: TTimer;
FIconData: TNotifyIconData;
procedure CheckClickTimer(Sender: TObject);
procedure SendTrayMessage(MsgID: DWORD; Flags: UINT);
procedure TrayWndProc(var Message: TMessage);
procedure SetActive(const Value: Boolean);
procedure SetIcon(const Value: TIcon);
procedure SetHint(const Value: string);
procedure SetPopupMenu(const Value: TPopupMenu);
protected
procedure Loaded; override;
procedure Notification(AComponent: TComponent; Operation: TOperation); override;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
published
property Active: Boolean read FActive write SetActive default False;
property Hint: string read FHint write SetHint;
property Icon: TIcon read FIcon write SetIcon;
property PopupMenu: TPopupMenu read FPopupMenu write SetPopupMenu;
property onClick: TNotifyEvent read FonClick write FonClick;
property OnDblClick: TNotifyEvent read FOnDblClick write FOnDblClick;
end;
procedure Register;
Implementation
procedure Register;
Begin
RegisterComponents(''Savetime'', [TTrayIcon]);
end;
{ TTrayIcon }
const
WM_CALLBACKMESSAGE = WM_USER + 100; // Pallet icon callback message constant
procedure TTrayIcon.CheckClickTimer(Sender: TObject);
Begin
FClickTimer.Enabled := False;
if Assigned(FonClick) then FonClick(Self);
end;
constructor TTrayIcon.Create(AOwner: TComponent);
Begin
inherited Create(AOwner);
FWindow := Classes.AllocateHWnd(TrayWndProc); // Window to process TrayIcon messages
FIcon := TIcon.Create;
FClickTimer := TTimer.Create(Self);/t // Timer that handles click and double-click intervals
FClickTimer.Enabled := False;
FClickTimer.Interval := GetDoubleClickTime; // The interval between double-clicking on the mouse in the control panel
FClickTimer.OnTimer := CheckClickTimer;
FIconData.cbSize := SizeOf(FIconData);/t// Initialize the NotifyIconData structure
FIconData.Wnd := FWindow;
FIconData.uID := UINT(Self);
FIconData.uCallbackMessage := WM_CALLBACKMESSAGE;
end;
destructor TTrayIcon.Destroy;
Begin
Active := False;
FClickTimer.Free;
FIcon.Free;
Classes.DeallocateHWnd(FWindow);
inherited;
end;
procedure TTrayIcon.Loaded;
Begin
inherited;
if FActive then
SendTrayMessage(NIM_ADD, NIF_MESSAGE or NIF_ICON or NIF_TIP);
end;
procedure TTrayIcon.Notification(AComponent: TComponent; Operation: TOperation);
Begin
inherited Notification(AComponent, Operation);
if (Operation = opRemove) and (AComponent = PopupMenu) then
PopupMenu := nil;
end;
procedure TTrayIcon.SendTrayMessage(MsgID: DWORD; Flags: UINT);
Begin
if (Flags and NIF_ICON) <> 0 then
Begin
if FIcon.Handle = 0 then/t/t // If the icon is not set, use the default icon
FIconData.hIcon := Application.Icon.Handle
else
FIconData.hIcon := FIcon.Handle;
end;
FIconData.uFlags := Flags;
Shell_NotifyIcon(MsgID, @FIconData);
end;
procedure TTrayIcon.SetActive(const Value: Boolean);
Begin
FActive := Value;
if (not (csDesigning in ComponentState)) and
(not (csLoading in ComponentState)) then
Begin
If Value then
SendTrayMessage(NIM_ADD, NIF_MESSAGE or NIF_ICON or NIF_TIP)
else
SendTrayMessage(NIM_DELETE, 0)
end;
end;
procedure TTrayIcon.SetHint(const Value: string);
Begin
FHint := Value;
StrPLCopy(FIconData.szTip, PChar(FHint), SizeOf(FIconData.szTip));
if (not (csDesigning in ComponentState)) and
(not (csLoading in ComponentState)) and
FActive then
Begin
SendTrayMessage(NIM_MODIFY, NIF_TIP);
end;
end;
procedure TTrayIcon.SetIcon(const Value: TIcon);
Begin
FIcon.Assign(Value);
if (FActive and not (csDesigning in ComponentState)) then
SendTrayMessage(NIM_MODIFY, NIF_ICON);
end;
procedure TTrayIcon.SetPopupMenu(const Value: TPopupMenu);
Begin
FPopupMenu := Value;
if Value <> nil then Value.FreeNotification(Self);
end;
procedure TTrayIcon.TrayWndProc(var Message: TMessage);
var
PT: TPoint;
Begin
with Message do
Begin
if Msg = WM_CALLBACKMESSAGE then
Begin
case LParam of
/tWM_LBUTTONDOWN:
/tbegin
/t // If the OnDblClick event is not set, call onclick directly
/t if not Assigned(FOnDblClick) then
/t begin
/t if Assigned(FonClick) then FonClick(Self);
/t end
/t else // Otherwise, use time to determine whether the double-click time has reached
/t FClickTimer.Enabled := True;
/tend;
/tWM_LBUTTONDBLCLK:
/tbegin
/t FClickTimer.Enabled := False;
/t if Assigned(FOnDblClick) then FOnDblClick(Self);
/tend;
/tWM_RBUTTONDOWN:
/tbegin
/t if Assigned(FPopupMenu) then
/t begin
/t SetForegroundWindow(FWindow); // This sentence must be added, otherwise the pop-up menu will not be automatically hidden
/t GetCursorPos(PT);
/t FPopupMenu.Popup(PT.X, PT.Y);
/t end;
/tend;
end;
end
else // Other messages are handed over to Windows for processing
Result := DefWindowProc(FWindow, Msg, WParam, LParam);
end;
end;
end.