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| /*
Tray Magician v1.1
Copyright © 1999 Ziff-Davis, Inc.
All rights reserved.
First published in PC Magazine, US Edition,
December 14, 1999.
Written by Ignacio Alvarez
This file implements traymagc.dll, which contains the hooks -
and most of the program functionality.
*/
#include "stdafx.h"
#include <shellapi.h>
// The following data section is shared by all instances of the DLL
#pragma comment(linker, "/SECTION:.shared,RWS")
#pragma data_seg(".shared")
//static HWND hDebug = 0;
static HWND hTrayMagic = 0;
static HHOOK hMouseHook = 0;
static HHOOK hGetHook = 0;
static BOOL LDown = FALSE;
static HWND hWindow = 0;
static HWND hTaskbar = 0;
static HWND hTray = 0;
static HWND hTaskSw = 0;
static HWND hReBar = 0;
static HWND hClock = 0;
static WNDPROC OldProc = NULL;
static BOOL Restoring = FALSE;
static BOOL ShowClock = FALSE;
static BOOL WinNT = FALSE;
static UINT RestoreMsg = 0;
static UINT BeginSubclassing= 0;
static UINT EndSubclassing = 0;
#pragma data_seg()
// This structure is used when intercepting the WM_COPYDATA messages -
// that carry the NOTIFYICONDATA information.
typedef struct
{
long Filler;
long Operation;
NOTIFYICONDATA Data;
} CINFO;
// Same structure as above but uses the wide version of NOTIFYICONDATA -
// for compatibility with NT
typedef struct
{
long Filler;
long Operation;
NOTIFYICONDATAW Data;
} CINFOW;
// This structure is used to cache modifications to the Tray icons -
// in order to prevent Windows from excessively rebuilding the Tray.
typedef struct
{
HWND hwnd;
WPARAM wParam;
CINFO Info;
CINFOW InfoW;
DWORD dwData;
BOOL Empty;
} CACHE;
static CACHE cache[64];
static int ccount = 0;
static HINSTANCE hInstance = 0;
static POINT PrevPos;
static RECT WindowRect;
BOOL APIENTRY DllMain( HANDLE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved
)
{
hInstance = (HINSTANCE)hModule;
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
case DLL_THREAD_ATTACH:
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
}
// This function was borrowed from Steven E. Sipe's excellent Tray Manager.
HICON MyCopyIcon(HICON hIcon)
{
ICONINFO info;
HICON hIconNew;
// Get information about the specified icon
GetIconInfo(hIcon,&info);
// Create a clone of the icon
hIconNew = CreateIconIndirect(&info);
// Delete the info item's bitmaps -- otherwise we get a very
// ugly memory leak
DeleteObject(info.hbmMask);
DeleteObject(info.hbmColor);
return(hIconNew);
}
// This function returns TRUE if running in NT
BOOL IsWinNT(void)
{
OSVERSIONINFO os;
os.dwOSVersionInfoSize = sizeof(os);
GetVersionEx(&os);
return (os.dwPlatformId == VER_PLATFORM_WIN32_NT);
}
// Tray Magician intercepts and stores modifications to the Tray in a cache,
// this function reads the cache and passes the intercepted modifications -
// back to the Tray.
void FlushCache(void)
{
COPYDATASTRUCT Data;
Data.cbData = sizeof(Data);
// It steps through each of the items in the cache array
for(int i = 0; i < ccount; i++)
// The cache array has an empty flag to indicate wether each -
// element is being used.
if(!cache[i].Empty)
{
UINT uFlags;
Data.dwData = cache[i].dwData;
// If running in NT the wide element of the array is used
if(WinNT)
{
Data.cbData = sizeof(CINFOW);
Data.lpData = &(cache[i].InfoW);
uFlags = cache[i].InfoW.Data.uFlags;
}
else
{
Data.cbData = sizeof(CINFO);
Data.lpData = &(cache[i].Info);
uFlags = cache[i].Info.Data.uFlags;
}
// It calls the original Taskbar WindowProc passing it the -
// modification stored in each cache item.
if(OldProc)
CallWindowProc(OldProc, cache[i].hwnd, WM_COPYDATA, cache[i].wParam, (DWORD)&Data);
cache[i].Empty = TRUE;
if(WinNT)
{
if(cache[i].InfoW.Data.uFlags & NIF_ICON)
DestroyIcon(cache[i].InfoW.Data.hIcon);
}
else
{
if(cache[i].Info.Data.uFlags & NIF_ICON)
DestroyIcon(cache[i].Info.Data.hIcon);
}
}
ccount = 0;
}
// This function returns TRUE if the Tray is currently hidden by Tray Magician
BOOL IsTrayMinimized(void)
{
RECT Taskbar, Tray;
GetWindowRect(hTaskbar, &Taskbar);
GetWindowRect(hTray, &Tray);
if(Taskbar.right - Taskbar.left > Taskbar.bottom - Taskbar.top)
return (Tray.right > Taskbar.right);
else
return (Tray.bottom > Taskbar.bottom);
}
// This function posts a user-defined message to the TrayMagician.exe window -
// indicating that the Tray should be unhidden.
void CALLBACK RestoreTray(void)
{
// The Restoring flag is used to prevent another message from being posted,
// while there's a previous one pending. It is done to prevent an -
// excessive flicker of the Tray.
if(!Restoring)
{
Restoring = TRUE;
PostMessage(hTrayMagic, RestoreMsg, 0, 0);
}
}
// This function takes care of hiding/restoring the system tray
void HideRestoreTray(void)
{
RECT Taskbar, Tray, ReBar, TaskSw, Clock;
POINT Pos;
GetWindowRect(hTaskbar, &Taskbar);
GetWindowRect(hReBar, &ReBar);
GetWindowRect(hTaskSw, &TaskSw);
GetWindowRect(hTray, &Tray);
GetWindowRect(hClock, &Clock);
GetCursorPos(&Pos);
// If the mouse is moving inside any part of the Tray, it restores it if hidden
if(IsTrayMinimized())
{
if(PtInRect(&Tray, Pos))
{
FlushCache();
RestoreTray();
}
}
// Else it hides it
else if(!PtInRect(&Tray, Pos))
{
int Delta;
POINT ChildPos = Pos;
ScreenToClient(hTaskbar, &ChildPos);
HWND Under = WindowFromPoint(Pos);
HWND ChildUnder = ChildWindowFromPoint(hTaskbar, ChildPos);
if(!(Under == hTaskbar && !ChildUnder))
{
// If the Taskbar is horizontal
if(Taskbar.bottom - Taskbar.top < Taskbar.right - Taskbar.left)
{
Pos.x = Tray.right - 2;
if(ShowClock)
if(Clock.left != Clock.right)
Pos.x = Clock.left - 1;
if(Pos.x != Tray.left)
{
Delta = Pos.x - Tray.left;
ScreenToClient(hTaskbar, &Pos);
Pos.y = 0;
// The Tray, and several of the Taskbar child windows need to be moved and/or
// resized in order to minimize the Tray.
if(ShowClock)
SetWindowPos(hClock, 0, 0, 1, 0, 0, SWP_NOSIZE | SWP_NOZORDER);
SetWindowPos(hTray, 0, Pos.x, Pos.y, 0, 0, SWP_NOSIZE | SWP_NOZORDER);
SetWindowPos(hReBar, 0, 0, 0, ReBar.right - ReBar.left + Delta , ReBar.bottom - ReBar.top, SWP_NOMOVE | SWP_NOZORDER);
SetWindowPos(hTaskSw, 0, 0, 0, TaskSw.right - TaskSw.left + Delta, TaskSw.bottom - TaskSw.top, SWP_NOMOVE | SWP_NOZORDER);
// RedrawWindow() is called to insure that the Taskbar is repainted
RedrawWindow(hTaskbar, NULL, NULL, RDW_FRAME | RDW_ERASE | RDW_INVALIDATE);
RedrawWindow(hTray, NULL, NULL, RDW_FRAME | RDW_ERASE | RDW_INVALIDATE);
SetWindowPos(hReBar, 0, 0, 0, ReBar.right - ReBar.left + Delta , ReBar.bottom - ReBar.top, SWP_NOMOVE | SWP_NOZORDER);
SetWindowPos(hTaskSw, 0, 0, 0, TaskSw.right - TaskSw.left + Delta, TaskSw.bottom - TaskSw.top, SWP_NOMOVE | SWP_NOZORDER);
if(ShowClock)
SetWindowPos(hClock, 0, 0, 1, 0, 0, SWP_NOSIZE | SWP_NOZORDER);
}
}
// Else If the Taskbar is vertical
else
{
Tray.bottom += 10;
if(Tray.top > 10 && !PtInRect(&Tray, Pos))
{
Pos.y = Tray.bottom - 12;
if(ShowClock)
if(Clock.left != Clock.right)
Pos.y -= Clock.bottom - Clock.top - 2;
if(Pos.y != Tray.top)
{
Delta = Pos.y - Tray.top;
ScreenToClient(hTaskbar, &Pos);
Pos.x = ((Taskbar.right - Taskbar.left) - (Tray.right - Tray.left)) / 2 - 4;
// The Tray, and several of the Taskbar child windows need to be moved and/or
// resized in order to minimize the Tray.
SetWindowPos(hTray, 0, Pos.x, Pos.y, 0, 0, SWP_NOSIZE | SWP_NOZORDER);
SetWindowPos(hReBar, 0, 0, 0, ReBar.right - ReBar.left, ReBar.bottom - ReBar.top + Delta, SWP_NOMOVE | SWP_NOZORDER);
SetWindowPos(hTaskSw, 0, 0, 0, TaskSw.right - TaskSw.left, TaskSw.bottom - TaskSw.top + Delta, SWP_NOMOVE | SWP_NOZORDER);
// RedrawWindow() is called to insure that the Taskbar is repainted
RedrawWindow(hTaskbar, NULL, NULL, RDW_FRAME | RDW_ERASE | RDW_INVALIDATE);
RedrawWindow(hTray, NULL, NULL, RDW_FRAME | RDW_ERASE | RDW_INVALIDATE);
SetWindowPos(hReBar, 0, 0, 0, ReBar.right - ReBar.left, ReBar.bottom - ReBar.top + Delta, SWP_NOMOVE | SWP_NOZORDER);
SetWindowPos(hTaskSw, 0, 0, 0, TaskSw.right - TaskSw.left, TaskSw.bottom - TaskSw.top + Delta, SWP_NOMOVE | SWP_NOZORDER);
}
}
}
}
}
}
// The Taskbar is subclassed by replacing its WindowProc with TaskbarProc
LRESULT CALLBACK TaskbarProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam)
{
__try
{
BOOL ClearRestoring = FALSE;
// If the Show Clock option is used, sometimes Windows fails to correctly -
// restore the clock position when it repaints the Taskbar,
// so SetWindowPos() is explicitly called to fix this problem.
if(!IsTrayMinimized())
{
RECT Tray, Clock;
GetWindowRect(hTray, &Tray);
GetWindowRect(hClock, &Clock);
if(Tray.right - Clock.right > 2)
SetWindowPos(hClock, 0, (Tray.right - Tray.left) - (Clock.right - Clock.left) - 1, 1, 0, 0, SWP_NOSIZE | SWP_NOZORDER);
}
// The WM_COPYDATA message is processed to intercept modifications to -
// the Tray while it's minimized.
if(Message == WM_COPYDATA)
{
PCOPYDATASTRUCT pData = (PCOPYDATASTRUCT) lParam;
if(pData)
if(pData->dwData == 1)
if(pData->lpData)
{
CINFOW *pInfoW;
CINFO *pInfo;
long Operation;
// If running in NT, the wide version of CINFO is used
if(WinNT)
{
pInfoW = (CINFOW *)pData->lpData;
Operation = pInfoW->Operation;
}
else
{
pInfo = (CINFO *)pData->lpData;
Operation = pInfo->Operation;
}
// The modifications are only intercepted if the Tray is hidden,
// to prevent unwanted flashing of the Tray, this is because Windows -
// attempts to rebuild the Tray every time there's a modification.
if(IsTrayMinimized() && !Restoring)
{
// Because the cache can store additions, when there's a delete
// operation, it first looks inside the cache.
if(Operation == NIM_DELETE)
for(int i = 0; i < ccount; i++)
if(!cache[i].Empty)
// If running in NT, the wide version of CINFO is used
if(WinNT)
{
if(pInfoW->Data.hWnd == cache[i].InfoW.Data.hWnd)
if(pInfoW->Data.uID == cache[i].InfoW.Data.uID)
if(cache[i].InfoW.Operation == NIM_ADD)
{
cache[i].Empty = TRUE;
if(cache[i].InfoW.Data.uFlags & NIF_ICON)
DestroyIcon(cache[i].InfoW.Data.hIcon);
// It returns to prevent the delete operation from -
// reaching the original Taskbar WindowProc
return 1;
}
}
else
{
if(pInfo->Data.hWnd == cache[i].Info.Data.hWnd)
if(pInfo->Data.uID == cache[i].Info.Data.uID)
if(cache[i].Info.Operation == NIM_ADD)
{
cache[i].Empty = TRUE;
if(cache[i].Info.Data.uFlags & NIF_ICON)
DestroyIcon(cache[i].Info.Data.hIcon);
// It returns to prevent the delete operation from -
// reaching the original Taskbar WindowProc
return 1;
}
}
// It first searches for the system tray icon in the array
for(int i = 0; i < ccount; i++)
if(!cache[i].Empty)
// If running in NT, the wide version of CINFO is used
if(WinNT)
{
if(pInfoW->Data.hWnd == cache[i].InfoW.Data.hWnd)
if(pInfoW->Data.uID == cache[i].InfoW.Data.uID)
{
if(Operation == NIM_ADD && cache[i].InfoW.Operation == NIM_DELETE)
{
Operation = NIM_MODIFY;
cache[i].InfoW.Operation = Operation;
}
// It exits the loop
break;
}
}
else
{
if(pInfo->Data.hWnd == cache[i].Info.Data.hWnd)
if(pInfo->Data.uID == cache[i].Info.Data.uID)
{
if(Operation == NIM_ADD && cache[i].Info.Operation == NIM_DELETE)
{
Operation = NIM_MODIFY;
cache[i].Info.Operation = Operation;
}
// It exits the loop
break;
}
}
// If it didn't find the system tray icon in the array,
// it searches the array for an empty item.
if(i == ccount)
for(int i = 0; i < 64; i++)
if(cache[i].Empty)
break;
// If the array is full, it skips this part
if(i < 64)
{
if(!cache[i].Empty)
{
if(WinNT)
{
if(pInfoW->Data.uFlags & NIF_ICON)
DestroyIcon(cache[i].InfoW.Data.hIcon);
}
else
{
if(pInfo->Data.uFlags & NIF_ICON)
DestroyIcon(cache[i].Info.Data.hIcon);
}
}
cache[i].Empty = FALSE;
cache[i].wParam = wParam;
cache[i].hwnd = hwnd;
cache[i].dwData = pData->dwData;
// If it isn't a modification to the Tray, the whole data structure is copied
if(Operation != NIM_MODIFY || i == ccount || cache[i].Empty)
{
if(WinNT)
{
cache[i].InfoW = *pInfoW;
if(cache[i].InfoW.Data.uFlags & NIF_ICON)
cache[i].InfoW.Data.hIcon = MyCopyIcon(pInfoW->Data.hIcon);
}
else
{
cache[i].Info = *pInfo;
if(cache[i].Info.Data.uFlags & NIF_ICON)
cache[i].Info.Data.hIcon = MyCopyIcon(pInfo->Data.hIcon);
}
}
// Else only the modifications are copied
else
{
if(WinNT)
{
if(pInfoW->Data.uFlags & NIF_ICON)
{
cache[i].InfoW.Data.uFlags |= NIF_ICON;
cache[i].InfoW.Data.hIcon = MyCopyIcon(pInfoW->Data.hIcon);
}
if(pInfoW->Data.uFlags & NIF_MESSAGE)
{
cache[i].InfoW.Data.uFlags |= NIF_MESSAGE;
cache[i].InfoW.Data.uCallbackMessage = pInfoW->Data.uCallbackMessage;
}
if(pInfoW->Data.uFlags & NIF_TIP)
{
cache[i].InfoW.Data.uFlags |= NIF_TIP;
wcscpy(cache[i].InfoW.Data.szTip, pInfoW->Data.szTip);
}
}
else
{
if(pInfo->Data.uFlags & NIF_ICON)
{
cache[i].Info.Data.uFlags |= NIF_ICON;
cache[i].Info.Data.hIcon = MyCopyIcon(pInfo->Data.hIcon);
}
if(pInfo->Data.uFlags & NIF_MESSAGE)
{
cache[i].Info.Data.uFlags |= NIF_MESSAGE;
cache[i].Info.Data.uCallbackMessage = pInfo->Data.uCallbackMessage;
}
if(pInfo->Data.uFlags & NIF_TIP)
{
cache[i].Info.Data.uFlags |= NIF_TIP;
strcpy(cache[i].Info.Data.szTip, pInfo->Data.szTip);
}
}
}
if(i == ccount)
ccount++;
// It returns to prevent the cached message from reaching -
// the original Taskbar WindowProc
return 1;
}
}
FlushCache();
ClearRestoring = TRUE;
}
}
// This user-defined message is used to end the subclassing
else if(Message == EndSubclassing)
{
// It passes to the Tray any pending modifications.
FlushCache();
// It restores the original WindowProc
SetWindowLong(hTaskbar, GWL_WNDPROC, (DWORD) OldProc);
}
// It checks if the tray needs hiding or restoring
else if(Message == WM_SETCURSOR)
HideRestoreTray();
// It passes the message to the original Taskbar WindowProc
int ret = CallWindowProc(OldProc, hwnd, Message, wParam, lParam);
// It clears the Restoring flag if the tray was restored
if(ClearRestoring)
{
ClearRestoring = FALSE;
Restoring = FALSE;
}
return ret;
}
__except(1)
{
return 0;
}
}
// The only purpose of this hook procedure is to enable -
// the replacement of the original Taskbar WindowProc.
LRESULT CALLBACK GetFunc(int nCode, WPARAM wParam, LPARAM lParam)
{
__try
{
if(nCode == HC_ACTION)
{
LPMSG Msg = (LPMSG) lParam;
// This is the user-defined message that's used to activate the subclassing
if(Msg->message == BeginSubclassing)
// It replaces the Taskbar WindowProc with it's own (TaskbarProc)
OldProc = (WNDPROC)SetWindowLong(hTaskbar, GWL_WNDPROC, (DWORD) TaskbarProc);
}
return(CallNextHookEx(hGetHook, nCode, wParam, lParam));
}
__except(1)
{
return 0;
}
}
// This is the implementation of the MouseProc used by the WH_MOUSE hook
LRESULT CALLBACK MouseFunc(int nCode, WPARAM wParam, LPARAM lParam)
{
__try
{
if(nCode >= 0)
{
LPMOUSEHOOKSTRUCT Mouse = (LPMOUSEHOOKSTRUCT) lParam;
switch(wParam)
{
// This message is processed to enable the click & drag feature
case WM_LBUTTONDOWN:
if(Mouse->wHitTestCode == HTCLIENT)
{
hWindow = Mouse->hwnd;
// The following loop is used to search for the top-level parent window
while(GetWindowLong(hWindow, GWL_STYLE) & WS_CHILDWINDOW)
if(GetParent(hWindow) != GetDesktopWindow())
hWindow = GetParent(hWindow);
else
break;
if(hWindow != GetDesktopWindow())
// The dragging feature is only available if the window isn't maximized
if(!IsZoomed(hWindow))
{
// The LDown flag is used to indicate that the dragging feature has been started
LDown = TRUE;
PrevPos = Mouse->pt;
// To enable the window dragging feature, the window -
// original position is saved.
GetWindowRect(hWindow, &WindowRect);
}
}
break;
case WM_MOUSEMOVE:
// If the dragging feature has been started
if(LDown)
// If the Shift and Ctrl keys are pressed
if ((GetAsyncKeyState(VK_SHIFT) & GetAsyncKeyState(VK_CONTROL)) >> 15)
{
// SwapMouseButton() is used to detect if the mouse is currently set -
// for right-handed or left-handed use.
BOOL Swapped = SwapMouseButton(TRUE);
if((Swapped && GetAsyncKeyState(VK_RBUTTON) >> 15) || (!Swapped && GetAsyncKeyState(VK_LBUTTON) >> 15))
{
int x, y;
x = WindowRect.left + Mouse->pt.x - PrevPos.x;
y = WindowRect.top + Mouse->pt.y - PrevPos.y;
// It moves the clicked window to its new position
SetWindowPos(hWindow, 0, x, y, 0, 0, SWP_NOSIZE || SWP_NOZORDER);
}
SwapMouseButton(Swapped);
}
else
LDown = FALSE;
// It hides or restores the tray if necessary
HideRestoreTray();
break;
case WM_LBUTTONUP:
// When the user releases the left button, the LDown flag is cleared
LDown = FALSE;
break;
}
}
// Always calls the next hook
return(CallNextHookEx(hMouseHook, nCode, wParam, lParam));
}
__except(1)
{
return 0;
}
}
// This function is called by TrayMagician.exe to install the necessary hooks
void CALLBACK HookInstall(HWND hwnd)
{
WinNT = IsWinNT();
hTrayMagic = hwnd;
// It registers a unique message used to signal TrayMagician.exe -
// that it should restore the system tray.
RestoreMsg = RegisterWindowMessage("TrayMagician_RestoreTray");
// These unique messages are used to initiate and end the subclassing of the Taskbar
BeginSubclassing = RegisterWindowMessage("TrayMagician_BeginSubclassing");
EndSubclassing = RegisterWindowMessage("TrayMagician_EndSubclassing");
// First, several Taskbar windows are searched by their class name and their -
// window handles are stored in global variables.
hTaskbar = FindWindow("Shell_TrayWnd", NULL);
hTray = FindWindowEx(hTaskbar, 0, "TrayNotifyWnd", NULL);
hClock = FindWindowEx(hTray, 0, "TrayClockWClass", NULL);
hReBar = FindWindowEx(hTaskbar, 0, "ReBarWindow32", NULL);
hTaskSw = FindWindowEx(hTaskbar, 0, "MSTaskSwWClass", NULL);
// This hook enables the window dragging feature and aids in the -
// minimizing and restoring of the Tray.
hMouseHook = SetWindowsHookEx(WH_MOUSE, MouseFunc, hInstance, 0);
// This hook is used only to make possible the subclassing of the Taskbar
hGetHook = SetWindowsHookEx(WH_GETMESSAGE, GetFunc, hInstance, GetWindowThreadProcessId(hTaskbar, NULL));
// This is the user-defined message that is sent to activate the subclassing
PostMessage(hTaskbar, BeginSubclassing, 0, 0);
}
// This function is called by TrayMagician.exe to remove all of the hooks
void CALLBACK HookRemove(void)
{
// This user defined message is sent to restore the original
// Taskbar WindowProc before removing the hooks.
SendMessage(hTaskbar, EndSubclassing, 0, 0);
UnhookWindowsHookEx(hMouseHook);
UnhookWindowsHookEx(hGetHook);
}
// This function is called by TrayMagician.exe to update -
// the state of the Show Clock option.
void CALLBACK SetShowClock(BOOL Show)
{
ShowClock = Show;
} |
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