问题: 更新处理函数在对话框的菜单中不能工作?
2008-12-26 09:11
260 查看
--------------------------------------------------------------------------------
此文章的信息应用于:
Microsoft Visual C++, 32位版本, version 6.0, 使用:
The Microsoft Foundation Classes (MFC)
--------------------------------------------------------------------------------
症状
从命令用户界面处理函数(Command UI handler)改变菜单状态(启用/禁用,选择/取消选择,更改文字)在由对话框处理时没有正常工作。
void CTestDlg::OnUpdateFileExit(CCmdUI* pCmdUI
{
pCmdUI->Enable(FALSE); //没有显示为禁用.
pCmdUI->SetCheck(TRUE); // 没有文字前显示选定标记.
pCmdUI->SetRadio(TRUE); // 没有在文字前显示点.
pCmdUI->SetText("Close"); //没有更改菜单文字.
}
原因
在下拉菜单显示的时候, WM_INITMENUPOPUP消息被先发送以显示菜单项。MFC CFrameWnd::OnInitMenuPopup 函数遍历菜单项并为每个菜单项调用更新命令处理函数(如果有的话).菜单的外观被更新以反映它的状态(启用/禁用,选择/取消选择)
更新用户界面机制在基于对话框的应用程序中不能工作,因为CDialog没有OnInitMenuPopup 处理函数,而使用CWnd's 默认处理函数,该函数没有为菜单项调用更新命令处理函数。
解决
适用下列步骤解决此问题
在消息映射中添加ON_WM_INITMENUPOPUP 项:
BEGIN_MESSAGE_MAP(CTestDlg, CDialog)
//{{AFX_MSG_MAP(CTestDlg)
........................
........................
//}}AFX_MSG_MAP
ON_WM_INITMENUPOPUP()
END_MESSAGE_MAP()
在你的对话框类中添加OnInitMenuPopup成员函数且复制下列代码到该函数(注意:代码基本上是从CFrameWnd::OnInitMenuPopup(在WinFrm.cpp中)复制过来的):
void CTestDlg::OnInitMenuPopup(CMenu *pPopupMenu, UINT nIndex,BOOL bSysMenu)
{
ASSERT(pPopupMenu != NULL);
// Check the enabled state of various menu items.
CCmdUI state;
state.m_pMenu = pPopupMenu;
ASSERT(state.m_pOther == NULL);
ASSERT(state.m_pParentMenu == NULL);
// Determine if menu is popup in top-level menu and set m_pOther to
// it if so (m_pParentMenu == NULL indicates that it is secondary popup).
HMENU hParentMenu;
if (AfxGetThreadState()->m_hTrackingMenu == pPopupMenu->m_hMenu)
state.m_pParentMenu = pPopupMenu; // Parent == child for tracking popup.
else if ((hParentMenu = ::GetMenu(m_hWnd)) != NULL)
{
CWnd* pParent = this;
// Child windows don't have menus--need to go to the top!
if (pParent != NULL &&
(hParentMenu = ::GetMenu(pParent->m_hWnd)) != NULL)
{
int nIndexMax = ::GetMenuItemCount(hParentMenu);
for (int nIndex = 0; nIndex < nIndexMax; nIndex++)
{
if (::GetSubMenu(hParentMenu, nIndex) == pPopupMenu->m_hMenu)
{
// When popup is found, m_pParentMenu is containing menu.
state.m_pParentMenu = CMenu::FromHandle(hParentMenu);
break;
}
}
}
}
state.m_nIndexMax = pPopupMenu->GetMenuItemCount();
for (state.m_nIndex = 0; state.m_nIndex < state.m_nIndexMax;
state.m_nIndex++)
{
state.m_nID = pPopupMenu->GetMenuItemID(state.m_nIndex);
if (state.m_nID == 0)
continue; // Menu separator or invalid cmd - ignore it.
ASSERT(state.m_pOther == NULL);
ASSERT(state.m_pMenu != NULL);
if (state.m_nID == (UINT)-1)
{
// Possibly a popup menu, route to first item of that popup.
state.m_pSubMenu = pPopupMenu->GetSubMenu(state.m_nIndex);
if (state.m_pSubMenu == NULL ||
(state.m_nID = state.m_pSubMenu->GetMenuItemID(0)) == 0 ||
state.m_nID == (UINT)-1)
{
continue; // First item of popup can't be routed to.
}
state.DoUpdate(this, TRUE); // Popups are never auto disabled.
}
else
{
// Normal menu item.
// Auto enable/disable if frame window has m_bAutoMenuEnable
// set and command is _not_ a system command.
state.m_pSubMenu = NULL;
state.DoUpdate(this, FALSE);
}
// Adjust for menu deletions and additions.
UINT nCount = pPopupMenu->GetMenuItemCount();
if (nCount < state.m_nIndexMax)
{
state.m_nIndex -= (state.m_nIndexMax - nCount);
while (state.m_nIndex < nCount &&
pPopupMenu->GetMenuItemID(state.m_nIndex) == state.m_nID)
{
state.m_nIndex++;
}
}
}
}
此文章的信息应用于:
Microsoft Visual C++, 32位版本, version 6.0, 使用:
The Microsoft Foundation Classes (MFC)
--------------------------------------------------------------------------------
症状
从命令用户界面处理函数(Command UI handler)改变菜单状态(启用/禁用,选择/取消选择,更改文字)在由对话框处理时没有正常工作。
void CTestDlg::OnUpdateFileExit(CCmdUI* pCmdUI
{
pCmdUI->Enable(FALSE); //没有显示为禁用.
pCmdUI->SetCheck(TRUE); // 没有文字前显示选定标记.
pCmdUI->SetRadio(TRUE); // 没有在文字前显示点.
pCmdUI->SetText("Close"); //没有更改菜单文字.
}
原因
在下拉菜单显示的时候, WM_INITMENUPOPUP消息被先发送以显示菜单项。MFC CFrameWnd::OnInitMenuPopup 函数遍历菜单项并为每个菜单项调用更新命令处理函数(如果有的话).菜单的外观被更新以反映它的状态(启用/禁用,选择/取消选择)
更新用户界面机制在基于对话框的应用程序中不能工作,因为CDialog没有OnInitMenuPopup 处理函数,而使用CWnd's 默认处理函数,该函数没有为菜单项调用更新命令处理函数。
解决
适用下列步骤解决此问题
在消息映射中添加ON_WM_INITMENUPOPUP 项:
BEGIN_MESSAGE_MAP(CTestDlg, CDialog)
//{{AFX_MSG_MAP(CTestDlg)
........................
........................
//}}AFX_MSG_MAP
ON_WM_INITMENUPOPUP()
END_MESSAGE_MAP()
在你的对话框类中添加OnInitMenuPopup成员函数且复制下列代码到该函数(注意:代码基本上是从CFrameWnd::OnInitMenuPopup(在WinFrm.cpp中)复制过来的):
void CTestDlg::OnInitMenuPopup(CMenu *pPopupMenu, UINT nIndex,BOOL bSysMenu)
{
ASSERT(pPopupMenu != NULL);
// Check the enabled state of various menu items.
CCmdUI state;
state.m_pMenu = pPopupMenu;
ASSERT(state.m_pOther == NULL);
ASSERT(state.m_pParentMenu == NULL);
// Determine if menu is popup in top-level menu and set m_pOther to
// it if so (m_pParentMenu == NULL indicates that it is secondary popup).
HMENU hParentMenu;
if (AfxGetThreadState()->m_hTrackingMenu == pPopupMenu->m_hMenu)
state.m_pParentMenu = pPopupMenu; // Parent == child for tracking popup.
else if ((hParentMenu = ::GetMenu(m_hWnd)) != NULL)
{
CWnd* pParent = this;
// Child windows don't have menus--need to go to the top!
if (pParent != NULL &&
(hParentMenu = ::GetMenu(pParent->m_hWnd)) != NULL)
{
int nIndexMax = ::GetMenuItemCount(hParentMenu);
for (int nIndex = 0; nIndex < nIndexMax; nIndex++)
{
if (::GetSubMenu(hParentMenu, nIndex) == pPopupMenu->m_hMenu)
{
// When popup is found, m_pParentMenu is containing menu.
state.m_pParentMenu = CMenu::FromHandle(hParentMenu);
break;
}
}
}
}
state.m_nIndexMax = pPopupMenu->GetMenuItemCount();
for (state.m_nIndex = 0; state.m_nIndex < state.m_nIndexMax;
state.m_nIndex++)
{
state.m_nID = pPopupMenu->GetMenuItemID(state.m_nIndex);
if (state.m_nID == 0)
continue; // Menu separator or invalid cmd - ignore it.
ASSERT(state.m_pOther == NULL);
ASSERT(state.m_pMenu != NULL);
if (state.m_nID == (UINT)-1)
{
// Possibly a popup menu, route to first item of that popup.
state.m_pSubMenu = pPopupMenu->GetSubMenu(state.m_nIndex);
if (state.m_pSubMenu == NULL ||
(state.m_nID = state.m_pSubMenu->GetMenuItemID(0)) == 0 ||
state.m_nID == (UINT)-1)
{
continue; // First item of popup can't be routed to.
}
state.DoUpdate(this, TRUE); // Popups are never auto disabled.
}
else
{
// Normal menu item.
// Auto enable/disable if frame window has m_bAutoMenuEnable
// set and command is _not_ a system command.
state.m_pSubMenu = NULL;
state.DoUpdate(this, FALSE);
}
// Adjust for menu deletions and additions.
UINT nCount = pPopupMenu->GetMenuItemCount();
if (nCount < state.m_nIndexMax)
{
state.m_nIndex -= (state.m_nIndexMax - nCount);
while (state.m_nIndex < nCount &&
pPopupMenu->GetMenuItemID(state.m_nIndex) == state.m_nID)
{
state.m_nIndex++;
}
}
}
}
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