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biosvos
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// ShellContextMenu.cpp: implementation of the CShellContextMenu class.
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//
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/////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2000-2001 by Paolo Messina
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// (http://www.geocities.com/ppescher - ppescher@yahoo.com)
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//
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// The contents of this file are subject to the Artistic License (the "License").
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// You may not use this file except in compliance with the License.
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// You may obtain a copy of the License at:
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// http://www.opensource.org/licenses/artistic-license.html
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//
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// If you find this code useful, credits would be nice!
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//
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/////////////////////////////////////////////////////////////////////////////
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#include "stdafx.h"
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#include "ShellContextMenu.h"
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//////////////////////////////////////////////////////////////////////
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// Construction/Destruction
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//////////////////////////////////////////////////////////////////////
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BOOL CShellContextMenu::InvokeCommand(UINT nCmdID)
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{
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if (!IsValid() || !IsCommandInRange(nCmdID))
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return FALSE;
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CMINVOKECOMMANDINFO cmi;
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ZeroMemory(&cmi, sizeof(CMINVOKECOMMANDINFO));
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cmi.cbSize = sizeof(CMINVOKECOMMANDINFO);
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cmi.hwnd = m_pOwner->GetSafeHwnd();
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cmi.lpVerb = MAKEINTRESOURCE(nCmdID - m_nCmdFirstID);
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cmi.nShow = SW_SHOWNORMAL;
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return (NOERROR == m_pCtxMenu->InvokeCommand(&cmi));
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}
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BOOL CShellContextMenu::FillMenu(CMenu *pMenu, UINT nStartIndex, UINT nCmdFirstID, UINT nCmdLastID, UINT nFlags)
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{
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if (!IsValid())
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return FALSE;
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m_nCmdFirstID = nCmdFirstID;
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m_nCmdLastID = nCmdLastID;
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UINT nDefID = pMenu->GetDefaultItem(GMDI_USEDISABLED, TRUE);
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HRESULT hr = m_pCtxMenu->QueryContextMenu(pMenu->GetSafeHmenu(),
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nStartIndex, m_nCmdFirstID, m_nCmdLastID, nFlags);
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if (nFlags & CMF_NODEFAULT)
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pMenu->SetDefaultItem(nDefID, TRUE);
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if (FAILED(hr))
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{
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m_nCmdLastID = m_nCmdFirstID = 0;
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return FALSE;
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}
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m_nCmdLastID = m_nCmdFirstID + HRESULT_CODE(hr) - 1;
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return TRUE;
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}
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BOOL CShellContextMenu::HandleMenuMessage(UINT message, WPARAM wParam, LPARAM lParam, LRESULT *pLResult)
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{
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if (!IsValid())
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return FALSE;
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switch (message)
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{
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case WM_MENUSELECT:
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{
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// look for a parent frame, to update its status bar
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if (m_pOwner == NULL)
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return FALSE;
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CFrameWnd* pFrame = m_pOwner->GetTopLevelFrame();
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if (pFrame == NULL)
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return FALSE;
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// provide status bar text
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*pLResult = 0;
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CString sStatusText;
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UINT uItem = (UINT) LOWORD(wParam);
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UINT fuFlags = (UINT) HIWORD(wParam);
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if (fuFlags == 0xFFFF) // menu was closed
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return FALSE;
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// get the first item of submenu, if popup item
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if (fuFlags & MF_POPUP)
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uItem = ::GetMenuItemID(::GetSubMenu((HMENU)lParam, uItem), 0);
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// check if it's a valid item
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if (!(fuFlags & MF_SEPARATOR)
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&& (uItem == 0 || !IsCommandInRange(uItem)))
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return FALSE;
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// get description
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if (!(fuFlags & MF_SEPARATOR))
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GetCommandDescription(uItem, sStatusText);
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// update status text, even if empty
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pFrame->SetMessageText(sStatusText);
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return TRUE;
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}
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break;
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case WM_INITMENUPOPUP: // initialize sub-menus
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case WM_MEASUREITEM: // handle owner-draw items
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case WM_DRAWITEM:
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{
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// prepare result in case we handle the message
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// (if we don't, it will be discarded)
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*pLResult = TRUE;
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if (message == WM_INITMENUPOPUP)
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*pLResult = 0;
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// check if it's a menu message
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if (message == WM_MEASUREITEM
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&& ((LPMEASUREITEMSTRUCT)lParam)->CtlType != ODT_MENU)
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return FALSE;
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if (message == WM_DRAWITEM
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&& ((LPDRAWITEMSTRUCT)lParam)->CtlType != ODT_MENU)
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return FALSE;
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// these messages need interface version 2
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SContextMenu2Ptr pCtxMenu2(m_pCtxMenu);
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if (!pCtxMenu2.IsValid())
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return FALSE;
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return (NOERROR == pCtxMenu2->HandleMenuMsg(message, wParam, lParam));
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}
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}
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return FALSE;
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}
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BOOL CShellContextMenu::GetCommandDescription(UINT nCmdID, CString& rText)
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{
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if (!IsValid() || !IsCommandInRange(nCmdID))
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return FALSE;
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// make a buffer large enough to hold either a Unicode or Ansi
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// string and initialize it to zeroes, because some shell
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// extensions return success even when they don't copy anything
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// to the buffer. Conversion is achieved by a CString object.
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WCHAR szHelpText[MAX_PATH];
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ZeroMemory(szHelpText, sizeof(WCHAR)*MAX_PATH);
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// try with Unicode first (it seems Explorer does so)
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HRESULT hr = m_pCtxMenu->GetCommandString(nCmdID - m_nCmdFirstID,
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GCS_HELPTEXTW, NULL, (LPSTR)szHelpText, MAX_PATH);
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if (*(LPWSTR)szHelpText != 0) // buffer was used
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rText = (LPWSTR)szHelpText;
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else
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{
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// otherwise try with Ansi
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hr = m_pCtxMenu->GetCommandString(nCmdID - m_nCmdFirstID,
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GCS_HELPTEXTA, NULL, (LPSTR)szHelpText, MAX_PATH);
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if (*(LPSTR)szHelpText != 0) // buffer was used
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rText = (LPSTR)szHelpText;
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}
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return SUCCEEDED(hr);
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}
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BOOL CShellContextMenu::Create(IShellFolder *pParentFolder, LPCITEMIDLIST pidl)
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{
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m_pCtxMenu = SContextMenuPtr(pParentFolder, pidl);
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return m_pCtxMenu.IsValid();
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}
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// a NULL pointer to unsubclass
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void CShellContextMenu::SetOwner(CWnd *pOwner)
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{
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if (m_pOwner != NULL || pOwner == NULL)
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UnsubclassOwner();
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m_pOwner = pOwner;
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if (m_pOwner != NULL)
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SubclassOwner();
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}
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const LPCTSTR SH_CTXMENU_OBJ = _T("ShellContextMenu");
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void CShellContextMenu::SubclassOwner()
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{
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ASSERT(::IsWindow(m_pOwner->GetSafeHwnd()));
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m_oldWndProc = (WNDPROC)::GetWindowLong(*m_pOwner, GWL_WNDPROC);
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::SetProp(*m_pOwner, SH_CTXMENU_OBJ, (HANDLE)this);
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::SetWindowLong(*m_pOwner, GWL_WNDPROC, (LONG)WindowProc);
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}
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LRESULT CALLBACK CShellContextMenu::WindowProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
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{
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CShellContextMenu *pThis =
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(CShellContextMenu*)::GetProp(hwnd, SH_CTXMENU_OBJ);
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LRESULT lResult;
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if (pThis->HandleMenuMessage(message, wParam, lParam, &lResult))
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return lResult; // success, no default processing
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if (message == WM_DESTROY)
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pThis->UnsubclassOwner();
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return ::CallWindowProc(pThis->m_oldWndProc, hwnd, message, wParam, lParam);
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}
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void CShellContextMenu::UnsubclassOwner()
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{
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ASSERT(::IsWindow(m_pOwner->GetSafeHwnd()));
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::RemoveProp(*m_pOwner, SH_CTXMENU_OBJ);
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::SetWindowLong(*m_pOwner, GWL_WNDPROC, (LONG)m_oldWndProc);
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m_pOwner = NULL;
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}
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