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发信人: oasis (期末拉,好好学习~~~), 信区: Visual
标  题: 如何在程序中控制和操纵 Windows 95 Task Bar（2）
发信站: BBS 荔园晨风站 (Tue Nov 30 22:12:27 1999), 站内信件

(二、CTrayIcon类的实现)

  这一节介绍如何用一个MFC实现CTrayIcon类，来抽象一些常用的操作，以
更方便的利用Task Bar。

1.TRAYICON.H

#ifndef _TRAYICON_H
#define _TRAYICON_H

////////////////
// CTrayIcon manages an icon in the Windows 95 system tray.
//
class CTrayIcon : public CCmdTarget {
protected:
   DECLARE_DYNAMIC(CTrayIcon)
   NOTIFYICONDATA m_nid;         // struct for Shell_NotifyIcon args

public:
   CTrayIcon(UINT uID);
   ~CTrayIcon();

   // Call this to receive tray notifications
   void SetNotificationWnd(CWnd* pNotifyWnd, UINT uCbMsg);

   // SetIcon functions. To remove icon, call SetIcon(0)
   //
   BOOL SetIcon(UINT uID); // main variant you want to use
   BOOL SetIcon(HICON hicon, LPCSTR lpTip);
   BOOL SetIcon(LPCTSTR lpResName, LPCSTR lpTip)
      { return SetIcon(lpResName ?
         AfxGetApp()->LoadIcon(lpResName) : NULL, lpTip); }
   BOOL SetStandardIcon(LPCTSTR lpszIconName, LPCSTR lpTip)
      { return SetIcon(::LoadIcon(NULL, lpszIconName), lpTip); }

   virtual LRESULT OnTrayNotification(WPARAM uID, LPARAM lEvent);
};

#endif

2.TRAYICON.CPP

#include "stdafx.h"
#include "trayicon.h"
#include <afxpriv.h>    // for AfxLoadString

IMPLEMENT_DYNAMIC(CTrayIcon, CCmdTarget)

CTrayIcon::CTrayIcon(UINT uID)
{
   // Initialize NOTIFYICONDATA
   memset(&m_nid, 0 , sizeof(m_nid));
   m_nid.cbSize = sizeof(m_nid);
   m_nid.uID = uID;  // never changes after construction

   // Use resource string as tip if there is one
   AfxLoadString(uID, m_nid.szTip, sizeof(m_nid.szTip));
}

CTrayIcon::~CTrayIcon()
{
   SetIcon(0); // remove icon from system tray
}

//////////////////
// Set notification window. It must created already.
//
void CTrayIcon::SetNotificationWnd(CWnd* pNotifyWnd, UINT uCbMsg)
{
   // If the following assert fails, you're probably
   // calling me before you created your window. Oops.
   ASSERT(pNotifyWnd= =NULL ||
∶:IsWindow(pNotifyWnd->GetSafeHwnd()));
   m_nid.hWnd = pNotifyWnd->GetSafeHwnd();

   ASSERT(uCbMsg= =0 || uCbMsg>=WM_USER);
   m_nid.uCallbackMessage = uCbMsg;
}

//////////////////
// This is the main variant for setting the icon.
// Sets both the icon and tooltip from resource ID
// To remove the icon, call SetIcon(0)
//
BOOL CTrayIcon::SetIcon(UINT uID)
{
   HICON hicon=NULL;
   if (uID) {
      AfxLoadString(uID, m_nid.szTip, sizeof(m_nid.szTip));
      hicon = AfxGetApp()->LoadIcon(uID);
   }
   return SetIcon(hicon, NULL);
}

//////////////////
// Common SetIcon for all overloads.
//
BOOL CTrayIcon::SetIcon(HICON hicon, LPCSTR lpTip)
{
   UINT msg;
   m_nid.uFlags = 0;

   // Set the icon
   if (hicon) {
      // Add or replace icon in system tray
      msg = m_nid.hIcon ? NIM_MODIFY : NIM_ADD;
      m_nid.hIcon = hicon;
      m_nid.uFlags |= NIF_ICON;
   } else { // remove icon from tray
      if (m_nid.hIcon= =NULL)
         return TRUE;      // already deleted
      msg = NIM_DELETE;
   }

   // Use the tip, if any
   if (lpTip)
      strncpy(m_nid.szTip, lpTip, sizeof(m_nid.szTip));
   if (m_nid.szTip[0])
      m_nid.uFlags |= NIF_TIP;

   // Use callback if any
   if (m_nid.uCallbackMessage && m_nid.hWnd)
      m_nid.uFlags |= NIF_MESSAGE;

   // Do it
   BOOL bRet = Shell_NotifyIcon(msg, &m_nid);
   if (msg= =NIM_DELETE || !bRet)
      m_nid.hIcon = NULL;  // failed
   return bRet;
}

/////////////////
// Default event handler handles right-menu and doubleclick.
// Call this function from your own notification handler.
//
LRESULT CTrayIcon::OnTrayNotification(WPARAM wID, LPARAM lEvent)
{
   if (wID!=m_nid.uID ||
      (lEvent!=WM_RBUTTONUP && lEvent!=WM_LBUTTONDBLCLK))
      return 0;

// If there's a resource menu with the same ID as the icon, use it
//as the right-button popup menu. CTrayIcon will interprets the
//first item in the menu as the default command for WM_LBUTTONDBLCLK
//
   CMenu menu;
   if (!menu.LoadMenu(m_nid.uID))
      return 0;
   CMenu* pSubMenu = menu.GetSubMenu(0);
   if (!pSubMenu)
      return 0;

   if (lEvent= =WM_RBUTTONUP) {

      // Make first menu item the default (bold font)
      ::SetMenuDefaultItem(pSubMenu->m_hMenu, 0, TRUE);

// Display the menu at the current mouse location. There's a
//"bug" (Microsoft calls it a feature) in Windows 95 that requires
//calling SetForegroundWindow. To find out more, search for Q135788 in
//MSDN.
//
      CPoint mouse;
      GetCursorPos(&mouse);
      ::SetForegroundWindow(m_nid.hWnd);
      ::TrackPopupMenu(pSubMenu->m_hMenu, 0, mouse.x, mouse.y, 0,
         m_nid.hWnd, NULL);

   } else  // double click: execute first menu item
      ::SendMessage(m_nid.hWnd, WM_COMMAND,
    pSubMenu->GetMenuItemID(0), 0);

   return 1; // handled
}

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