393 lines
9.8 KiB
C
393 lines
9.8 KiB
C
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/*****************************************************************************
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*
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* Component: sndvol32.exe
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* File: vu.c
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* Purpose: peak meter custom control
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*
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* Copyright (c) 1985-1998 Microsoft Corporation
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*
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*****************************************************************************/
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/*
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* VUMeter Control
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*
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* */
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#include <windows.h>
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#include <windowsx.h>
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#include "vu.h"
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const TCHAR gszVUClass[] = VUMETER_CLASS;
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LRESULT FAR PASCAL VUMeterProc(HWND hwnd, UINT wMessage, WPARAM wParam, LPARAM lParam);
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#define GETVUINST(x) (VUINST *)GetWindowLongPtr(x, 0)
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#define SETVUINST(x,y) SetWindowLongPtr(x, 0, (LONG_PTR)y)
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typedef struct tag_VUINST {
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CREATESTRUCT cs;
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DWORD dwLevel; // current value
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DWORD dwMax; // value max
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DWORD dwMin; // value min
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DWORD dwBreak; // last break
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DWORD dwStyle; // dbl extra style bits ???
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DWORD cBreaks; // no. of breaks
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DWORD cRGB; // no. of RGBQUADs
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DWORD dwHeight;
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DWORD dwWidth;
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HBITMAP hColor; // bitmap cache of full display
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HBITMAP hBackground; // bitmap cache of background
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RGBQUAD *aRGB; // array of RGBQUADs describing colors
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} VUINST, *PVUINST, FAR *LPVUINST;
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const RGBQUAD gaRGBDefault[] = {
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{ 0, 127, 0, 0}, // dark green
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{ 0, 127, 0, 0}, // dark green
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{ 0, 255, 0, 0}, // light green
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{ 0, 255, 255, 0}, // yellow
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{ 0, 0, 255, 0} // red
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};
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BOOL InitVUControl(HINSTANCE hInst)
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{
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WNDCLASS wc;
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wc.lpszClassName = (LPTSTR)gszVUClass;
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wc.hCursor = LoadCursor( NULL, IDC_ARROW );
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wc.lpszMenuName = (LPTSTR)NULL;
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wc.style = CS_HREDRAW|CS_VREDRAW|CS_GLOBALCLASS;
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wc.lpfnWndProc = (WNDPROC) VUMeterProc;
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wc.hInstance = hInst;
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wc.hIcon = NULL;
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wc.cbWndExtra = sizeof(VUINST *);
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wc.cbClsExtra = 0;
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wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1 );
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/* register meter window class */
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if(!RegisterClass(&wc))
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{
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return FALSE;
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}
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return (TRUE);
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}
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DWORD vu_CalcBreaks(
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PVUINST pvi)
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{
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DWORD cBreaks;
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if (pvi->dwMax - pvi->dwMin > 0)
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{
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cBreaks = ((pvi->dwLevel - pvi->dwMin) * pvi->cBreaks)
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/ (pvi->dwMax - pvi->dwMin);
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if (!cBreaks && pvi->dwLevel > pvi->dwMin)
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cBreaks++;
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}
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else
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cBreaks = 0;
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if (cBreaks > pvi->cBreaks)
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cBreaks = pvi->cBreaks;
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return cBreaks;
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}
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BOOL vu_OnCreate(
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HWND hwnd,
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LPCREATESTRUCT lpCreateStruct)
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{
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PVUINST pvi;
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//
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// alloc an instance data structure
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pvi = LocalAlloc(LPTR, sizeof(VUINST));
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if (!pvi)
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return FALSE;
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SETVUINST(hwnd, pvi);
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pvi->cBreaks = 10;
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pvi->cRGB = sizeof(gaRGBDefault)/sizeof(RGBQUAD);
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pvi->aRGB = (RGBQUAD *)gaRGBDefault;
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pvi->dwMin = 0;
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pvi->dwMax = 0;
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pvi->dwLevel = 0;
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pvi->dwBreak = 0;
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pvi->hColor = NULL;
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pvi->hBackground = NULL;
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return TRUE;
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}
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void vu_ResetControl(
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PVUINST pvi)
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{
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if (pvi->hColor)
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{
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DeleteObject(pvi->hColor);
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pvi->hColor = NULL;
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}
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if (pvi->hBackground)
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{
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DeleteObject(pvi->hBackground);
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pvi->hBackground = NULL;
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}
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}
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void vu_OnDestroy(
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HWND hwnd)
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{
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PVUINST pvi = GETVUINST(hwnd);
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if (pvi)
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{
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vu_ResetControl(pvi);
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LocalFree((HLOCAL)pvi);
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SETVUINST(hwnd,0);
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}
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}
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void vu_OnPaint(
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HWND hwnd)
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{
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PVUINST pvi = GETVUINST(hwnd);
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RECT rc, rcB;
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PAINTSTRUCT ps;
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int i;
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int iSize;
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DWORD cBreaks;
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if (!GetUpdateRect(hwnd, &rc, FALSE))
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return;
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BeginPaint(hwnd, &ps);
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GetClientRect(hwnd, &rc);
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//
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// Create the foreground bitmap if not already cached
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//
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if (pvi->hColor == NULL)
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{
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HDC hdc;
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HBITMAP hbmp, hold;
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HBRUSH hbr;
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RECT rcp;
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rcp.left = 0;
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rcp.right = rc.right - rc.left - 4;
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rcp.top = 0;
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rcp.bottom = rc.bottom - rc.top - 4 ;
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hdc = CreateCompatibleDC(ps.hdc);
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hbmp = CreateCompatibleBitmap(ps.hdc, rcp.right, rcp.bottom);
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hold = SelectObject(hdc, hbmp);
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//
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// background
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//
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hbr = CreateSolidBrush(GetSysColor(COLOR_BTNFACE));
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FillRect(hdc, &rcp, hbr);
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if (hbr) DeleteObject(hbr);
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//
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// each block will be iSize tall
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//
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iSize = (rcp.bottom - 1) / pvi->cBreaks;
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//
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// color blocks
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//
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for (i = 0; i < (int)pvi->cBreaks; i++)
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{
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int iColor = i / (pvi->cBreaks/pvi->cRGB);
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if (iColor >= (int)pvi->cRGB - 1)
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iColor = (int)pvi->cRGB - 1;
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hbr = CreateSolidBrush(RGB(pvi->aRGB[iColor].rgbRed
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,pvi->aRGB[iColor].rgbGreen
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,pvi->aRGB[iColor].rgbBlue));
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rcB.left = 0;
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rcB.right = rcp.right;
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rcB.top = rcp.bottom - (i+1)*iSize;
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// rcB.bottom = rcp.bottom - i*iSize;
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rcB.bottom = rcB.top + iSize - 1;
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FillRect(hdc, &rcB, hbr);
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DeleteObject(hbr);
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}
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pvi->hColor = SelectObject(hdc, hold);
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DeleteDC(hdc);
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}
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//
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// Paint it
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//
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{
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HDC hdc, hdcColor;
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HBITMAP holdColor, hbmp, hold;
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RECT rcC = rc;
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HBRUSH hbr;
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//
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// always show something if we exceed the minimum
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cBreaks = vu_CalcBreaks(pvi);
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rcC.left = 0;
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rcC.right = rc.right - rc.left - 4;
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rcC.top = 0;
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rcC.bottom = rc.bottom - rc.top - 4;
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// each block will be iSize+1 tall
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iSize = (rcC.bottom - 1) / pvi->cBreaks ;
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// paint the uncolor area
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hdc = CreateCompatibleDC(ps.hdc);
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hbmp = CreateCompatibleBitmap(ps.hdc, rcC.right, rcC.bottom);
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hold = SelectObject(hdc, hbmp);
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hbr = CreateSolidBrush(GetSysColor(COLOR_BTNFACE));
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FillRect(hdc, &rcC, hbr);
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if (hbr)
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DeleteObject(hbr);
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if (cBreaks > 0)
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{
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// paint the color area
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hdcColor = CreateCompatibleDC(ps.hdc);
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if (hdcColor)
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holdColor = SelectObject(hdcColor, pvi->hColor);
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BitBlt(hdc
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, 0
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, rcC.bottom - (iSize * cBreaks)
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, rcC.right
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, iSize * cBreaks
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, hdcColor
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, 0
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, rcC.bottom - (iSize * cBreaks)
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, SRCCOPY);
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SelectObject(hdcColor, holdColor);
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DeleteDC(hdcColor);
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}
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//
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// finally, blt into the real dc
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BitBlt(ps.hdc
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, 2
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, 2
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, rcC.right
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, rcC.bottom
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, hdc
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, 0
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, 0
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, SRCCOPY);
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SelectObject(hdc, hold);
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if (hbmp) DeleteObject(hbmp);
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DeleteDC(hdc);
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}
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DrawEdge(ps.hdc, &rc, BDR_SUNKENOUTER, BF_RECT);
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EndPaint(hwnd, &ps);
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}
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void vu_OnSysColorChange(
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HWND hwnd)
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{
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PVUINST pvi = GETVUINST(hwnd);
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vu_ResetControl(pvi);
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}
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void vu_OnPaletteChanged(
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HWND hwnd,
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HWND hwndPaletteChange)
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{
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PVUINST pvi = GETVUINST(hwnd);
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vu_ResetControl(pvi);
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}
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void vu_OnSize(
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HWND hwnd,
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UINT state,
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int cx,
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int cy)
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{
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PVUINST pvi = GETVUINST(hwnd);
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pvi->dwWidth = cx;
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pvi->dwHeight = cy;
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vu_ResetControl(pvi);
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}
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void vu_OnEnable(
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HWND hwnd,
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BOOL fEnable)
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{
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PVUINST pvi = GETVUINST(hwnd);
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}
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void vu_OnPrivateMessage(
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HWND hwnd,
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UINT wMessage,
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WPARAM wParam,
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LPARAM lParam)
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{
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PVUINST pvi = GETVUINST(hwnd);
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switch (wMessage)
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{
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case VU_SETRANGEMIN:
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// OutputDebugString(TEXT ("SetRangeMin\r\n"));
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pvi->dwMin = (DWORD)lParam;
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break;
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case VU_SETRANGEMAX:
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// OutputDebugString(TEXT ("SetRangeMax\r\n"));
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pvi->dwMax = (DWORD)lParam;
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break;
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case VU_SETPOS:
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pvi->dwLevel = (DWORD)lParam;
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// {TCHAR foo[256];
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// wsprintf(foo, TEXT ("v:%lx\r\n"),lParam);
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// OutputDebugString(foo);
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// }
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if (pvi->dwBreak != vu_CalcBreaks(pvi))
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{
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pvi->dwBreak = vu_CalcBreaks(pvi);
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InvalidateRect(hwnd, NULL, TRUE);
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}
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else if (wParam)
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InvalidateRect(hwnd, NULL, TRUE);
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break;
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}
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}
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LRESULT FAR PASCAL
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VUMeterProc(
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HWND hwnd,
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UINT wMessage,
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WPARAM wParam,
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LPARAM lParam)
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{
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switch (wMessage)
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{
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HANDLE_MSG(hwnd, WM_CREATE, vu_OnCreate);
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HANDLE_MSG(hwnd, WM_DESTROY, vu_OnDestroy);
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HANDLE_MSG(hwnd, WM_PAINT, vu_OnPaint);
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HANDLE_MSG(hwnd, WM_SYSCOLORCHANGE, vu_OnSysColorChange);
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HANDLE_MSG(hwnd, WM_PALETTECHANGED, vu_OnPaletteChanged);
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HANDLE_MSG(hwnd, WM_SIZE, vu_OnSize);
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HANDLE_MSG(hwnd, WM_ENABLE, vu_OnEnable);
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// HANDLE_MSG(hwnd, WM_TIMER, vu_OnTimer);
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case VU_SETRANGEMIN:
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case VU_SETRANGEMAX:
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case VU_SETPOS:
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vu_OnPrivateMessage(hwnd, wMessage, wParam, lParam);
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return 0;
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case WM_ERASEBKGND:
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return TRUE;
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default:
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break;
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}
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return DefWindowProc (hwnd, wMessage, wParam, lParam) ;
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}
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