Source code of Windows XP (NT5)
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/*--------------------------------------------------------------------------*
*
* Microsoft Windows
* Copyright (C) Microsoft Corporation, 1992 - 00
*
* File: kbdnav.cpp
*
* Contents: Implementation of CKeyboardNavDelayTimer
*
* History: 4-May-2000 jeffro Created
*
*--------------------------------------------------------------------------*/
#include "stdafx.h"
#include "kbdnav.h"
#ifdef DBG
CTraceTag tagKeyboardNavDelay (_T("Keyboard Navigation"), _T("Keyboard Navigation Delay"));
#endif
/*+-------------------------------------------------------------------------*
* CKeyboardNavDelayTimer::CKeyboardNavDelayTimer
*
* Constructs a CKeyboardNavDelayTimer object.
*--------------------------------------------------------------------------*/
CKeyboardNavDelayTimer::CKeyboardNavDelayTimer () :
m_nTimerID (0)
{
}
/*+-------------------------------------------------------------------------*
* CKeyboardNavDelayTimer::~CKeyboardNavDelayTimer
*
* Destroys a CKeyboardNavDelayTimer object.
*--------------------------------------------------------------------------*/
CKeyboardNavDelayTimer::~CKeyboardNavDelayTimer ()
{
ScStopTimer();
}
/*+-------------------------------------------------------------------------*
* CKeyboardNavDelayTimer::TimerProc
*
* Callback function called when a timer started by this class fires.
*--------------------------------------------------------------------------*/
VOID CALLBACK CKeyboardNavDelayTimer::TimerProc (
HWND hwnd,
UINT uMsg,
UINT_PTR idEvent,
DWORD dwTime)
{
CTimerMap& TimerMap = GetTimerMap();
/*
* locate the CKeyboardNavDelayTimer object corresponding to this timer event
*/
CTimerMap::iterator itTimer = TimerMap.find (idEvent);
// ASSERT(itTimer != TimerMap.end());
// The above assertion is not valid because: (From the SDK docs):
// The KillTimer function does not remove WM_TIMER messages already posted to the message queue.
if (itTimer != TimerMap.end())
{
CKeyboardNavDelayTimer *pNavDelay = itTimer->second;
if (pNavDelay != NULL)
{
Trace (tagKeyboardNavDelay, _T ("Timer fired: id=%d"), pNavDelay->m_nTimerID);
pNavDelay->OnTimer();
}
}
}
/*+-------------------------------------------------------------------------*
* CKeyboardNavDelayTimer::ScStartTimer
*
*
*--------------------------------------------------------------------------*/
SC CKeyboardNavDelayTimer::ScStartTimer()
{
DECLARE_SC (sc, _T("CKeyboardNavDelayTimer::ScStartTimer"));
/*
* shouldn't start a timer if it's started already
*/
ASSERT (m_nTimerID == 0);
/*
* Get the menu popout delay and use that for the delay before
* changing the result pane. If the system doesn't support
* SPI_GETMENUSHOWDELAY (i.e. Win95, NT4), use a value slightly
* longer than the longer of keyboard repeat delay and keyboard
* repeat rate.
*/
DWORD dwDelay;
if (!SystemParametersInfo (SPI_GETMENUSHOWDELAY, 0, &dwDelay, false))
{
/*
* Get the keyboard delay and convert to milliseconds. The ordinal
* range is from 0 (approximately 250 ms dealy) to 3 (approximately
* 1 sec delay). The equation to convert from ordinal to approximate
* milliseconds is:
*
* msec = (ordinal + 1) * 250;
*/
DWORD dwKeyboardDelayOrdinal;
SystemParametersInfo (SPI_GETKEYBOARDDELAY, 0, &dwKeyboardDelayOrdinal, false);
DWORD dwKeyboardDelay = (dwKeyboardDelayOrdinal + 1) * 250;
/*
* Get the keyboard speed and convert to milliseconds. The ordinal
* range is from 0 (approximately 2.5 reps per second, or 400 msec
* interval) to 31 (approximately 30 reps per second, or 33 msec
* interval). (The documentation has this reversed.) The equation
* to convert from ordinal to approximate milliseconds is:
*
* msec = (ordinal * -12) + 400;
*/
DWORD dwKeyboardRateOrdinal;
SystemParametersInfo (SPI_GETKEYBOARDSPEED, 0, &dwKeyboardRateOrdinal, false);
DWORD dwKeyboardRate = (dwKeyboardRateOrdinal * -12) + 400;
dwDelay = std::_MAX (dwKeyboardDelay, dwKeyboardRate) + 50;
}
m_nTimerID = SetTimer(NULL, 0, dwDelay, TimerProc);
if (m_nTimerID == 0)
return (sc.FromLastError());
GetTimerMap()[m_nTimerID] = this; // set up the timer map.
Trace (tagKeyboardNavDelay, _T("Started new timer: id=%d, delay=%d milliseconds"), m_nTimerID, dwDelay);
return (sc);
}
/*+-------------------------------------------------------------------------*
* CKeyboardNavDelayTimer::ScStopTimer
*
* Stops the timer running for this CKeyboardNavDelayTimer, if it is running
*--------------------------------------------------------------------------*/
SC CKeyboardNavDelayTimer::ScStopTimer()
{
DECLARE_SC (sc, _T("CKeyboardNavDelayTimer::ScStopTimer"));
if (m_nTimerID != 0)
{
CTimerMap& TimerMap = GetTimerMap();
CTimerMap::iterator itTimer = TimerMap.find (m_nTimerID);
ASSERT (itTimer != TimerMap.end());
TimerMap.erase (itTimer);
Trace (tagKeyboardNavDelay, _T("Stopped timer: id=%d"), m_nTimerID);
UINT_PTR nTimerID = m_nTimerID;
m_nTimerID = 0;
if (!KillTimer (NULL, nTimerID))
return (sc.FromLastError());
}
return (sc);
}
/*+-------------------------------------------------------------------------*
* CKeyboardNavDelayTimer::GetTimerMap
*
* Returns a reference to the data structure that maps timer IDs to
* CKeyboardNavDelayTimer objects.
*--------------------------------------------------------------------------*/
CKeyboardNavDelayTimer::CTimerMap& CKeyboardNavDelayTimer::GetTimerMap()
{
static CTimerMap map;
return (map);
}