trayicon.c

ReactOS是一些高手根据Windows XP的内核编写出的类XP。内核实现机理和API函数调用几乎相同。甚至可以兼容XP的程序。喜欢研究系统内核的人可以看一看。

/*
 *  ReactOS Task Manager
 *
 *  trayicon.c
 *
 *  Copyright (C) 1999 - 2001  Brian Palmer  <[e-mail]>
 *                2005         Klemens Friedl <[e-mail]>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <precomp.h>

HICON TrayIcon_GetProcessorUsageIcon(void)
{
    HICON        hTrayIcon = NULL;
    HDC            hScreenDC = NULL;
    HDC            hDC = NULL;
    HBITMAP        hBitmap = NULL;
    HBITMAP        hOldBitmap = NULL;
    HBITMAP        hBitmapMask = NULL;
    ICONINFO    iconInfo;
    ULONG        ProcessorUsage;
    int            nLinesToDraw;
    HBRUSH        hBitmapBrush = NULL;
    RECT        rc;

    /*
     * Get a handle to the screen DC
     */
    hScreenDC = GetDC(NULL);
    if (!hScreenDC)
        goto done;

    /*
     * Create our own DC from it
     */
    hDC = CreateCompatibleDC(hScreenDC);
    if (!hDC)
        goto done;

    /*
     * Load the bitmaps
     */
    hBitmap = LoadBitmap(hInst, MAKEINTRESOURCE(IDB_TRAYICON));
    hBitmapMask = LoadBitmap(hInst, MAKEINTRESOURCE(IDB_TRAYMASK));
    if (!hBitmap || !hBitmapMask)
        goto done;

    hBitmapBrush = CreateSolidBrush(RGB(0, 255, 0));
    if (!hBitmapBrush)
        goto done;

    /*
     * Select the bitmap into our device context
     * so we can draw on it.
     */
    hOldBitmap = (HBITMAP) SelectObject(hDC, hBitmap);

    /*
     * Get the cpu usage
     */
    ProcessorUsage = PerfDataGetProcessorUsage();

    /*
     * Calculate how many lines to draw
     * since we have 11 rows of space
     * to draw the cpu usage instead of
     * just having 10.
     */
    nLinesToDraw = (ProcessorUsage + (ProcessorUsage / 10)) / 11;
    rc.left = 3;
    rc.top = 12 - nLinesToDraw;
    rc.right = 13;
    rc.bottom = 13;

    /*
     * Now draw the cpu usage
     */
    if (nLinesToDraw)
        FillRect(hDC, &rc, hBitmapBrush);

    /*
     * Now that we are done drawing put the
     * old bitmap back.
     */
    hBitmap = SelectObject(hDC, hOldBitmap);
    hOldBitmap = NULL;

    iconInfo.fIcon = TRUE;
    iconInfo.xHotspot = 0;
    iconInfo.yHotspot = 0;
    iconInfo.hbmMask = hBitmapMask;
    iconInfo.hbmColor = hBitmap;

    hTrayIcon = CreateIconIndirect(&iconInfo);

done:
    /*
     * Cleanup
     */
    if (hScreenDC)
        ReleaseDC(NULL, hScreenDC);
    if (hOldBitmap)
        hBitmap = SelectObject(hDC, hOldBitmap);
    if (hDC)
        DeleteDC(hDC);
    if (hBitmapBrush)
        DeleteObject(hBitmapBrush);
    if (hBitmap)
        DeleteObject(hBitmap);
    if (hBitmapMask)
        DeleteObject(hBitmapMask);

    /*
     * Return the newly created tray icon (if successful)
     */
    return hTrayIcon;
}

BOOL TrayIcon_ShellAddTrayIcon(void)
{
    NOTIFYICONDATA    nid;
    HICON            hIcon = NULL;
    BOOL            bRetVal;
    TCHAR szMsg[256];

    memset(&nid, 0, sizeof(NOTIFYICONDATA));

    hIcon = TrayIcon_GetProcessorUsageIcon();

    nid.cbSize = sizeof(NOTIFYICONDATA);
    nid.hWnd = hMainWnd;
    nid.uID = 0;
    nid.uFlags = NIF_ICON | NIF_MESSAGE | NIF_TIP;
    nid.uCallbackMessage = WM_ONTRAYICON;
    nid.hIcon = hIcon;

	      
    LoadString( GetModuleHandle(NULL), IDS_MSG_TRAYICONCPUUSAGE, szMsg, sizeof(szMsg) / sizeof(szMsg[0]));
    wsprintf(nid.szTip, szMsg, PerfDataGetProcessorUsage());

    bRetVal = Shell_NotifyIcon(NIM_ADD, &nid);

    if (hIcon)
        DestroyIcon(hIcon);

    return bRetVal;
}

BOOL TrayIcon_ShellRemoveTrayIcon(void)
{
    NOTIFYICONDATA    nid;
    BOOL            bRetVal;

    memset(&nid, 0, sizeof(NOTIFYICONDATA));

    nid.cbSize = sizeof(NOTIFYICONDATA);
    nid.hWnd = hMainWnd;
    nid.uID = 0;
    nid.uFlags = 0;
    nid.uCallbackMessage = WM_ONTRAYICON;

    bRetVal = Shell_NotifyIcon(NIM_DELETE, &nid);

    return bRetVal;
}

BOOL TrayIcon_ShellUpdateTrayIcon(void)
{
    NOTIFYICONDATA  nid;
    HICON           hIcon = NULL;
    BOOL            bRetVal;
    TCHAR           szTemp[256];

    memset(&nid, 0, sizeof(NOTIFYICONDATA));

    hIcon = TrayIcon_GetProcessorUsageIcon();

    nid.cbSize = sizeof(NOTIFYICONDATA);
    nid.hWnd = hMainWnd;
    nid.uID = 0;
    nid.uFlags = NIF_ICON | NIF_MESSAGE | NIF_TIP;
    nid.uCallbackMessage = WM_ONTRAYICON;
    nid.hIcon = hIcon;
    LoadString(hInst, IDS_MSG_TRAYICONCPUUSAGE, szTemp, 256);
    wsprintf(nid.szTip, szTemp, PerfDataGetProcessorUsage());

    bRetVal = Shell_NotifyIcon(NIM_MODIFY, &nid);

    if (hIcon)
        DestroyIcon(hIcon);

    return bRetVal;
}