Source code of Windows XP (NT5)
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///////////////////////////////////////////////////////////////////////////////////////////////////////////
//
// KNOB.H
//
// Defines the Knob Control
//
// Copyright (c) Microsoft Corporation 1997
//
// 12/18/97 David Stewart / dstewart
//
///////////////////////////////////////////////////////////////////////////////////////////////////////////
#ifndef _KNOB_HEADER_
#define _KNOB_HEADER_
#include "windows.h"
#ifdef __cplusplus
extern "C" {
#endif
//forward declaration
class CKnob;
//helper functions for global stuff, start up, shut down, etc.
CKnob* GetKnobFromID(HWND hwndParent, int nID);
CKnob* GetKnobFromHWND(HWND hwnd);
class CKnob
{
public:
/*
Create a class of the knob
*/
friend CKnob* CreateKnob(DWORD dwWindowStyle,
DWORD dwRange,
DWORD dwInitialPosition,
int x,
int y,
int width,
int height,
HWND hwndParent,
int nID,
HINSTANCE hInst);
CKnob(); //constructor
~CKnob(); //destructor
HWND GetHWND() {return m_hwnd;}
int GetID() {return m_nID;}
void SetRange(DWORD dwRange) {m_dwRange = dwRange;}
DWORD GetRange() {return m_dwRange;}
DWORD GetPosition() {return m_dwCurPosition;}
void SetPosition(DWORD dwPosition, BOOL fNotify);
private:
//non-static privates
int m_nID;
HWND m_hwnd;
int m_nLightX;
int m_nLightY;
DWORD m_dwRange;
DWORD m_dwPosition;
DWORD m_dwCurPosition;
double m_trackdegree;
UINT_PTR m_uFlashTimerID;
UINT_PTR m_uTrackTimerID;
BOOL m_fDim;
BOOL m_fFastKnob;
void OnButtonDown(int x, int y);
void OnButtonUp();
BOOL ComputeCursor(int deltaX, int deltaY, int maxdist);
void OnMouseMove(int x, int y);
void OnTimer();
void OnFlashTimer();
void Draw(HDC hdc);
void KMaskBlt(HDC hdcDest, int x, int y, int width, int height, HDC hdcSource, int xs, int ys, HBITMAP hMask, int xm, int xy, DWORD dwDummy);
private:
//static stuff for all knobs
static HINSTANCE m_hInst;
static DWORD m_dwKnobClassRef;
static ATOM m_KnobAtom;
static HANDLE m_hbmpKnob;
static HANDLE m_hbmpKnobTab;
static HANDLE m_hbmpLight;
static HANDLE m_hbmpLightBright;
static HANDLE m_hbmpLightMask;
static int m_nLightWidth;
static int m_nLightHeight;
static LRESULT CALLBACK KnobProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam);
static void CALLBACK TrackProc(HWND hwnd, UINT uMsg, UINT idEvent, DWORD dwTime);
static void CALLBACK FlashProc(HWND hwnd, UINT uMsg, UINT idEvent, DWORD dwTime);
static BOOL InitKnobs(HINSTANCE hInst);
static void UninitKnobs();
};
#ifdef __cplusplus
};
#endif
#endif //_KNOB_HEADER_