118 lines
4.1 KiB
C
118 lines
4.1 KiB
C
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//****************************************************************************
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//
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// Copyright (c) 1994, Microsoft Corporation
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//
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// File: BUSY.H
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//
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// The classes defined here are:
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//
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// CBusy Utility class to indicate to the user that the app is busy.
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// When an instance is constructed, it changes the cursor to the
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// wait cursor. If a parent window is provided it will receive a
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// message to set the text of its status indicator to a specified
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// string. This is useful for windows that have a status bar or
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// some other textual indication of status. When the instance is
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// destructed, the cursor is restored and the parent window is
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// sent a message to reset its status indicator.
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//
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// History:
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//
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// Scott V. Walker, SEA 6/30/94 Created.
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//
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//****************************************************************************
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#ifndef _BUSY_H_
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#define _BUSY_H_
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//****************************************************************************
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//
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// Messages sent to parent window.
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//
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//----------------------------------------------------------------------------
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//
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// WM_BUSY_GETTEXT
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//
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// This message is sent by the CBusy to retrieve the current status indicator
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// text. The CBusy will restore this text when it destructs.
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//
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// wparam = nLength; // Length of buffer.
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// lparam = (LPARAM)pStr; // Pointer to buffer to copy data into.
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//
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//----------------------------------------------------------------------------
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//
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// WM_BUSY_SETTEXT
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//
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// This message is sent by the CBusy to inform the window to set its status
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// indicator to the given string.
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//
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// wparam is unused.
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// lparam = (LPARAM)pStr; // Pointer to buffer containing status text.
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//
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// Return value = n/a.
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//
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//****************************************************************************
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#define WM_BUSY_GETTEXT (WM_USER + 0x75)
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#define WM_BUSY_SETTEXT (WM_USER + 0x76)
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//****************************************************************************
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//
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// CLASS: CBusy
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//
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// When you construct a CBusy, you have the option of specifying a parent
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// window and a string ID. If these are provided, The CBusy will send
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// WM_BUSY_GETTEXT and WM_BUSY_SETTEXT messages to the window during
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// construction and destruction. The parent window can respond to these
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// messages by modifying a text status indicator (such as a status bar) to
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// display the specified string. Use these by constructing a local instance
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// at the top of a function. When the function goes out of scope (no matter
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// where the return is encountered), the instance will be destructed, causing
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// the busy indications (cursor and text) to be restored.
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//
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//----------------------------------------------------------------------------
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//
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// CBusy::CBusy
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//
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// Constructor. When an instance is constructed, it sets the cursor to the
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// wait cursor and optionally notifies a specified window to change its
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// status indicator.
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//
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// Parameters:
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// CWnd *pParentWnd Optional parent window. If provided, the CBusy
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// sends WM_BUSY_GETTEXT and WM_BUSY_SETTEXT
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// messages to the given window.
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// const char *pszText Optional string. If provided (and if a parent
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// window is specified), the CBusy passes it in the
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// WM_BUSY_SETTEXT message to the parent window. If
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// not provided, the parent window is sent an empty
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// string.
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//
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// If parameter 2 is a UINT, CBusy will treat it as a string ID and do a
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// LoadString.
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//
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//****************************************************************************
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class CBusy : public CObject
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{
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private:
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CWnd *m_pParentWnd;
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HCURSOR m_hOldCursor;
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CString m_sOldText;
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private:
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void SetBusy(CWnd *pParentWnd, LPCTSTR pszText);
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public:
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CBusy(CWnd *pParentWnd, LPCTSTR pszText);
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CBusy(CWnd *pParentWnd, UINT nID);
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CBusy(CWnd *pParentWnd);
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CBusy();
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~CBusy();
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};
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#endif // _BUSY_H_
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