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{
olddelphitrayicon.pas
This file implements a simple windows only TTrayIcon to be used on old Delphi
versions that don't come with a TTrayIcon pre-installed. It is a modifyed version
of the TTrayIcon from Lazarus, relicensed by the author (Felipe Monteiro de
Carvalho) to GPL for license uniformity in the magnifier code.
Copyright (C) 1998 - 2007 Harri Pyy, Chris O'Donnell, Felipe Monteiro de Carvalho
This file is part of Virtual Magnifying Glass.
Virtual Magnifying Glass is free software;
you can redistribute it and/or modify it under the
terms of the GNU General Public License version 2
as published by the Free Software Foundation.
Virtual Magnifying Glass is distributed in the hope
that it will be useful, but WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the GNU General Public License for more details.
Please note that the General Public License version 2 does not permit
incorporating Virtual Magnifying Glass into proprietary
programs.
AUTHORS: Chris O'Donnell, Felipe Monteiro de Carvalho and Harri Pyy
}
unit olddelphitrayicon;
interface
uses
SysUtils, Classes, Controls, Forms, Menus, Graphics, Windows, Messages, ShellAPI;
type
{ TCustomTrayIcon }
TCustomTrayIcon = class(TComponent)
private
FPopUpMenu: TPopupMenu;
FIcon: TIcon;
FHint: string;
FVisible, FShowIcon: Boolean;
FOnPaint, FOnClick, FOnDblClick: TNotifyEvent;
FOnMouseDown, FOnMouseUp: TMouseEvent;
FOnMouseMove: TMouseMoveEvent;
function GetCanvas: TCanvas;
procedure SetVisible(Value: Boolean);
class function InternalHide(const ATrayIcon: TCustomTrayIcon): Boolean;
class function InternalShow(const ATrayIcon: TCustomTrayIcon): Boolean;
public
Handle: Cardinal;
constructor Create(TheOwner: TComponent); override;
destructor Destroy; override;
function Hide: Boolean;
function Show: Boolean;
procedure InternalUpdate;
function GetPosition: TPoint;
property Canvas: TCanvas read GetCanvas;
property PopUpMenu: TPopupMenu read FPopUpMenu write FPopUpMenu;
property Icon: TIcon read FIcon write FIcon;
property Hint: string read FHint write FHint;
property ShowIcon: Boolean read FShowIcon write FShowIcon;
property Visible: Boolean read FVisible write SetVisible;
property OnClick: TNotifyEvent read FOnClick write FOnClick;
property OnDblClick: TNotifyEvent read FOnDblClick write FOnDblClick;
property OnMouseDown: TMouseEvent read FOnMouseDown write FOnMouseDown;
property OnMouseUp: TMouseEvent read FOnMouseUp write FOnMouseUp;
property OnMouseMove: TMouseMoveEvent read FOnMouseMove write FOnMouseMove;
property OnPaint: TNotifyEvent read FOnPaint write FOnPaint;
end;
{ TTrayIcon }
TTrayIcon = class(TCustomTrayIcon)
published
property PopUpMenu;
property Icon;
property Hint;
property Visible;
property OnClick;
property OnDblClick;
property OnMouseDown;
property OnMouseUp;
property OnMouseMove;
property OnPaint;
end;
implementation
const
szClassName = 'TTrayIconClass';
szAppTitle = 'apptitle';
uIDTrayIcon = 25;
var
vwsTrayIcon: TCustomTrayIcon;
{*******************************************************************
* TrayWndProc ()
*
* DESCRIPTION: Window procedure that processes messages for the
* systray icon
*
* PARAMETERS: Standard Mouse Messages have this parameters:
*
* fwKeys = wParam; // key flags
* xPos = LOWORD(lParam); // horizontal position of cursor
* yPos = HIWORD(lParam); // vertical position of cursor
* //* Those positions seam to be wrong
* // Use Mouse.CursorPos instead
*
* RETURNS: A pointer to the newly created object
*
*******************************************************************}
function TrayWndProc(Handle: HWND; iMsg: UINT; WParam_: WPARAM; LParam_:LPARAM):LRESULT; stdcall;
var
pt: TPoint;
begin
if iMsg = WM_USER + uIDTrayIcon then
begin
case LParam_ of
WM_RBUTTONUP:
begin
if Assigned(vwsTrayIcon.OnMouseUp) then vwsTrayIcon.OnMouseUp(Application,
mbRight, KeysToShiftState(WParam_), LOWORD(lParam_), HIWORD(lParam_));
if Assigned(vwsTrayIcon.PopUpMenu) then
begin
pt := Mouse.CursorPos;// Gets cursor position in screen coords
// Apparently SetForegroundWindow and PostMessage are necessary
// because we're invoking the shortcut menu from a notification icon
// This is an attempt to prevent from messing with the Z-order
SetForegroundWindow(Handle);
PostMessage(Handle, WM_NULL, 0, 0);
vwsTrayIcon.PopUpMenu.Popup(pt.x, pt.y);
end;
end;
WM_RBUTTONDOWN: if Assigned(vwsTrayIcon.OnMouseDown) then vwsTrayIcon.OnMouseDown(Application,
mbRight, KeysToShiftState(WParam_), LOWORD(lParam_), HIWORD(lParam_));
WM_RBUTTONDBLCLK: if Assigned(vwsTrayIcon.OnDblClick) then vwsTrayIcon.OnDblClick(Application);
WM_MBUTTONDOWN: if Assigned(vwsTrayIcon.OnMouseDown) then vwsTrayIcon.OnMouseDown(Application,
mbMiddle, KeysToShiftState(WParam_), LOWORD(lParam_), HIWORD(lParam_));
WM_MBUTTONUP: if Assigned(vwsTrayIcon.OnMouseUp) then vwsTrayIcon.OnMouseUp(Application,
mbMiddle, KeysToShiftState(WParam_), LOWORD(lParam_), HIWORD(lParam_));
WM_LBUTTONUP:
begin
if Assigned(vwsTrayIcon.OnMouseUp) then vwsTrayIcon.OnMouseUp(Application,
mbLeft, KeysToShiftState(WParam_), LOWORD(lParam_), HIWORD(lParam_));
if Assigned(vwsTrayIcon.OnClick) then vwsTrayIcon.OnClick(Application);
end;
WM_LBUTTONDOWN: if Assigned(vwsTrayIcon.OnMouseDown) then vwsTrayIcon.OnMouseDown(Application,
mbLeft, KeysToShiftState(WParam_), LOWORD(lParam_), HIWORD(lParam_));
WM_LBUTTONDBLCLK: if Assigned(vwsTrayIcon.OnDblClick) then vwsTrayIcon.OnDblClick(Application);
WM_MOUSEMOVE: if Assigned(vwsTrayIcon.OnMouseMove) then
vwsTrayIcon.OnMouseMove(Application, KeysToShiftState(WParam_), LOWORD(lParam_), HIWORD(lParam_));
end;
Result := 1;
Exit;
end;
Result := DefWindowProc(Handle, iMsg, WParam_, LParam_);
end;
{*******************************************************************
* TCustomTrayIcon.Create ()
*
* DESCRIPTION: Creates an object from the TCustomTrayIcon class
*
* PARAMETERS: TheOwner - The owner of the component (this may be nil)
*
* RETURNS: A pointer to the newly created object
*
*******************************************************************}
constructor TCustomTrayIcon.Create(TheOwner : TComponent);
begin
inherited Create(TheOwner);
FIcon := TIcon.Create;
FShowIcon := True;
end;
{*******************************************************************
* TCustomTrayIcon.Destroy ()
*
* DESCRIPTION: Destroys an object derived from the TCustomTrayIcon class
*
* PARAMETERS: None
*
* RETURNS: Nothing
*
*******************************************************************}
destructor TCustomTrayIcon.Destroy;
begin
{ Avoids an unremoved icon on the tray }
Hide;
FIcon.Free;
inherited Destroy;
end;
{*******************************************************************
* TCustomTrayIcon.Hide ()
*
* DESCRIPTION: Hides the Icon
*
* PARAMETERS: None
*
* RETURNS: If successfull
*
*******************************************************************}
function TCustomTrayIcon.Hide: Boolean;
begin
if not FVisible then Exit;
FVisible := False;
// InternalUpdate;
Result := InternalHide(Self);
end;
{*******************************************************************
* TCustomTrayIcon.Show ()
*
* DESCRIPTION: Shows the Icon
*
* PARAMETERS: None
*
* RETURNS: If successfull
*
*******************************************************************}
function TCustomTrayIcon.Show: Boolean;
begin
if FVisible then Exit;
FVisible := True;
InternalUpdate;
Result := InternalShow(Self);
end;
{*******************************************************************
* TCustomTrayIcon.SetVisible ()
*
* DESCRIPTION: Setter method of the Visible property
*
* PARAMETERS: None
*
* RETURNS: If successfull
*
*******************************************************************}
procedure TCustomTrayIcon.SetVisible(Value: Boolean);
begin
if Value then Show
else Hide;
end;
{*******************************************************************
* TCustomTrayIcon.InternalUpdate ()
*
* DESCRIPTION: Makes modifications to the Icon while running
* i.e. without hiding it and showing again
*
* PARAMETERS: None
*
* RETURNS: Nothing
*
*******************************************************************}
procedure TCustomTrayIcon.InternalUpdate;
begin
// Nothing to be done
end;
{*******************************************************************
* TCustomTrayIcon.GetPosition ()
*
* DESCRIPTION: Returns the position of the tray icon on the display.
* This function is utilized to show message boxes near
* the icon
*
* PARAMETERS: None
*
* RETURNS: Nothing
*
*******************************************************************}
function TCustomTrayIcon.GetPosition: TPoint;
begin
Result := Point(0, 0);
end;
{*******************************************************************
* TCustomTrayIcon.GetCanvas ()
*
* DESCRIPTION: Getter method of the Canvas property
*
* PARAMETERS: None
*
* RETURNS: The canvas of the underlaying Widgetset component
*
*******************************************************************}
function TCustomTrayIcon.GetCanvas: TCanvas;
begin
Result := nil;
end;
{*******************************************************************
* TCustomTrayIcon.InternalHide ()
*
* DESCRIPTION: Hides the main tray icon of the program
*
* PARAMETERS: None
*
* RETURNS: True if sucessfull, otherwise False
*
*******************************************************************}
class function TCustomTrayIcon.InternalHide(const ATrayIcon: TCustomTrayIcon): Boolean;
var
tnid: TNotifyIconData;
begin
// Fill TNotifyIconData
FillChar(tnid, SizeOf(tnid), 0);
tnid.cbSize := SizeOf(TNotifyIconData);
tnid.Wnd := ATrayIcon.Handle;
tnid.uID := uIDTrayIcon;
// Remove the icon
Result := Shell_NotifyIconA(NIM_DELETE, @tnid);
// Destroys the helper Windows
PostMessage(ATrayIcon.Handle, WM_CLOSE, 0, 0);
PostMessage(ATrayIcon.Handle, WM_DESTROY, 0, 0);
Application.ProcessMessages;
end;
{*******************************************************************
* TCustomTrayIcon.InternalShow ()
*
* DESCRIPTION: Shows the main tray icon of the program
*
* PARAMETERS: None
*
* RETURNS: True if sucessfull, otherwise False
*
*******************************************************************}
class function TCustomTrayIcon.InternalShow(const ATrayIcon: TCustomTrayIcon): Boolean;
var
tnid: TNotifyIconData;
buffer: PChar;
Window: Windows.TWndClassEx;
begin
vwsTrayIcon := ATrayIcon;
ZeroMemory(@Window, SizeOf(TWndClassEx));
Window.cbSize := SizeOf(TWndClassEx);
Window.style := CS_OWNDC;
Window.lpfnWndProc := @TrayWndProc;
Window.cbClsExtra := 0;
Window.cbWndExtra := 0;
Window.hInstance := hInstance;
// Window.hIcon := Icon.Handle;
Window.hCursor := LoadCursor(0, IDC_ARROW);
Window.hbrBackground := HBRUSH(GetStockObject(NULL_BRUSH));
Window.lpszMenuName := nil;
Window.lpszClassName := szClassName;
// Window.hIconSm := hSmallIcon;
Windows.RegisterClassEx(Window);
ATrayIcon.Handle := CreateWindowEx(
0, //* Ensure that there will be no button in the bar */
szClassName, //* Name of the registered class */
szAppTitle, //* Title of the window */
0, //* Style of the window */
0, //* x-position (at beginning) */
0, //* y-position (at beginning) */
CW_USEDEFAULT, //* window width */
CW_USEDEFAULT, //* window height */
0, //* handle to parent or owner window */
0, //* handle to menu */
hInstance, //* handle to application instance */
nil); //* pointer to window-creation data */
// Fill TNotifyIconData
FillChar(tnid, SizeOf(tnid), 0);
tnid.cbSize := SizeOf(TNotifyIconData);
tnid.Wnd := ATrayIcon.Handle;
tnid.uID := uIDTrayIcon;
tnid.uFlags := NIF_MESSAGE or NIF_ICON;
if (ATrayIcon.Hint <> '') then tnid.uFlags := tnid.uFlags or NIF_TIP;
tnid.uCallbackMessage := WM_USER + uIDTrayIcon;
tnid.hIcon := ATrayIcon.Icon.Handle;
buffer := PChar(ATrayIcon.Hint);
StrCopy(@tnid.szTip, buffer);
// Create Taskbar icon
Result := Shell_NotifyIconA(NIM_ADD, @tnid);
end;
end.
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