Leaked source code of windows server 2003
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//-----------------------------------------------------------------------------
//
// File: LOCPCT.H
//
// Declarations for CLocPercentFrame and CLocPercentHelper
//
// Author: kenwal
//
// Copyright (c) 1995-1997, Microsoft Corporation. All rights reserved.
//
//-----------------------------------------------------------------------------
#ifndef LOCUTIL__LocPct_H__INCLUDED
#define LOCUTIL__LocPct_H__INCLUDED
// Classes in this header file
class CLocPercentHelper;class CLocPercentFrame;
//
// The CLocPercentHelper class can help in building acurate
// percentage complete messages for complicated processes.
//
// Here is how the CLocPercentHelper works.
//
// The CLocPercentHelper class deals with "frames" of work. Each frame
// is 100% of a unit of work. A CLocPercentHelper will always
// start off with 1 frame. If you want to use these functions
// you first need to call PercentSetUnits passing a number that will
// represent 100% complete. For example if you need to process 4 items
// you could set this to 4. After you process each item you would
// call PercentAddValue. Correct status messages would be sent
// indicating you are 1/4, 2/4, 3/4, and 4/4 done.
// This processing comes in handy when you break up the work
// in sub functions, or "frames" of work. Each function only
// knows about what it needs to do.
// Say in the resource example you call a function to handle each
// resource. Each time the handler is called it is given 1/4
// of the total time. The handler can break up its time however
// it likes without knowing how much total time there is.
// Say the sub function needs to do 10 things. It calls PercentSetUnits(10).
// It then calls PercentAddValue as each of the 10 things are
// accomplished. The total percent will reflect that 100% of this
// sub function is really only 1/4 of the total percent. The sub function
// only needs to worry about what it knows it has to do.
// The sub function can assign part of its work to other functions
// by creating frames for them. There is no limit to the number
// of frames.
//
// Override the virtual function void OnSendPercentage(UINT nPct)
// in your subclass of CLocPercentHelper to do what you want
// with the percent calculated from the helper.
// Example:
/*
CLocPercentHelper pctHelp; pctHelp.PercentSetUnits(4); //assume 4 items to process
do { pctHelp.PercentPushFrame(1); //Set up a new Frame equal
//to 1 of my units of work.
//In this case 1/4 of the
//total time.
//All of the Percent... functions
//called made now deal with
//this new frame.
HandleItem(pctHelp); pctHelp.PersentPopFrame(); //Remove the frame created
//and mark the amount
//of time it was equal to
//completed.
} while (more items) -----------------------------------------------------------------------
HandleItem(CLocPercentHelper& pctHelp) function pctHelp.PercentSetUnits(10); //Assume this is a dialog resource
//with 10 controls.
//This function divides up
//the work it needs to do in
//a way that makes sence for it.
//
//When this "frame" is at 100%
//the total percentage is still
//just 1/4 of the total time
//since this frame was given 1/4
//of the total time from the caller.
do { // This function can assign part of its processing
// to another function by calling PercentPushFrame also.
HandleControl(); pctHelp.PercentAddValue(); //Send a message to the
//handler indicating the
//current percentage.
//The object will calculate
//the total percent based on
//the current stack of frames.
} while (more controls) */
//
// CLocPercentFrame represents a working unit of progress.
// The progress model implemented with the CLocPercentHelper will
// support unlimited levels of work units.
//
// This class is a helper class used only by CLocPercentHelper
//
#pragma warning(disable: 4275) // non dll-interface class 'foo' used
// as base for dll-interface class 'bar'
class LTAPIENTRY CLocPercentFrame : public CObject{ friend CLocPercentHelper;
protected: CLocPercentFrame(); CLocPercentFrame(CLocPercentFrame* pParent, UINT nValueInParent); void SetComplete(); // Force this frame to represent 100%.
void AddValue(UINT nValue); // Add nValue to the internal value.
// The internal value will never be greater than
// the internal units.
void SetValue(UINT nValue); // Set the internal value.
// The internal value will never be greater than
// the internal units.
void SetUnits(UINT nUnits); // Set the internal units
UINT m_nUnits; //Number that represents 100%
UINT m_nValue; //Number that represent how far done
//this frame is.
CLocPercentFrame* m_pParent; //Pointer to the parent frame
UINT m_nValueInParent; //How much this frame is worth
//in the parents context.
void MemberInit(); // Initialize member values
};
//
// List of frames in the helper
//
class LTAPIENTRY CLocPercentFrameList : public CTypedPtrList<CPtrList, CLocPercentFrame*>{};
class LTAPIENTRY CLocPercentHelper : public CObject{public: CLocPercentHelper();
virtual ~CLocPercentHelper(); void PercentSetUnits(UINT nUnits, BOOL bReport = FALSE); // Set the units of the current frame.
// Calculate and report the total % done through
// OnSendPercentage if bReport is TRUE.
void PercentSetValue(UINT nValue, BOOL bReport = TRUE); // Set the value of the current frame.
// Calculate and report the total % done through
// OnSendPercentage if bReport is TRUE.
void PercentAddValue(UINT nValue = 1, BOOL bReport = TRUE); // Add nValue to the value of the current frame.
// Calculate and report the total % done through
// OnSendPercentage if bReport is TRUE.
void PercentSetComplete(BOOL bReport = TRUE); // Set the current frame complete.
// Calculate and report the total % done through
// OnSendPercentage if bReport is TRUE.
void PercentForceAllComplete(BOOL bReport = TRUE); // Force all frames complete.
// Calculate and report 100% done through
// OnSendPercentage if bReport is TRUE.
void PercentPushFrame(UINT nValueInParent = 1); // Create a new frame and assign in nValueInParent
// All Percent... calls made after this call deal with
// the new frame.
void PercentPopFrame(BOOL bReport = TRUE); // Set the current frame complete and add the current
// frames valueInParent to its parent frame.
// The current frames parent is now the current frame.
// Calculate and report the total % done through
// OnSendPercentage if bReport is TRUE.
void PercentSetStrict(BOOL bOnOff = TRUE); // Strict behavior means the helper will ASSERT (_DEBUG only) if
// the calculated percent is over 100%. This can happen
// if the unit values assigned to frames are not truly what
// the process does. If you are unable to set acurate
// unit values and the program quesses, you can turn
// strict off.
BOOL PercentIsStrict(); // Return TRUE or FALSE if strict is on.
protected:
// Support for Progress Reporting
CLocPercentFrame m_FrameMain; //The main frame always
//present. This frame
//will never have a parent.
CLocPercentFrameList m_FrameList; //List of open frames.
CLocPercentFrame* m_pCurrentFrame; //Pointer to the current
//frame
BOOL m_bStrict; //Strict on will ASSERT if
//total % gets over 100
void SendPercentage(); // Calculates the percentage based on the current frame
// Calles OnSendPercentage with the calulated value.
void SafeDeleteFrame(CLocPercentFrame* pFrame); // Safely deletes a frame making sure the pFrame is
// not m_FrameMain.
virtual void OnSendPercentage(UINT nPct); // Callback function for subclasses to do what they
// want with the percentage. Default implementation
// does nothing.
};
#pragma warning(default: 4275)
//
// Helper class with a CProgressiveObject
//
class LTAPIENTRY CLocPctProgress : public CLocPercentHelper{public: CLocPctProgress(); CLocPctProgress(CProgressiveObject* pProgObj);
void SetProgressiveObject(CProgressiveObject* pProgObj);
protected: virtual void OnSendPercentage(UINT nPct);
CProgressiveObject* m_pProgObj;};
#endif // LOCUTIL__LocPct_H__INCLUDED
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