WM_IDLEUPDATECMDUI WM_KICKIDLE的含义？？

[aguo2006]

ExaTBar_1 是 CToolBar的派生类
在ExaTBar_1.CPP 中消息映射为

BEGIN_MESSAGE_MAP(ExaTBar_1,CToolBar)

//{{ AFX_MSG_MAP(ExaTBar_1)
ON_MESSAGE(WM_IDLEUPDATECMDUI,OnIdleUpdateCmdUI)
//}} AFX_MSG_MAP

END_MESSAGE_MAP()



ExaDg_1 是 CDialog)的派生类
在ExaDg_1.cpp 中消息映射为

BEGIN_MESSAGE_MAP(ExaDg_1, CDialog)
//{{AFX_MSG_MAP(ExaDg_1)
ON_MESSAGE_VOID(WM_KICKIDLE,OnKickIdle)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

void ExaDg_1::OnKickIdle()
{
SendMessageToDescendants(WM_IDLEUPDATECMDUI);
}

ExaTBar_1 是 ExaDg_1上的一个TOOLBAR ；我的问题的是

WM_IDLEUPDATECMDUI 是什么含义？
WM_KICKIDLE 是什么含义？

结合本段代码 它们之间的关系？

[syy64]

WM_IDLEUPDATECMDUI, WM_KICKIDLE读是自定义消息吧，从代码中看不出什么，字面理解是跟空处理有关。

[aguo2006]

TO ：SYY64

#define WM_IDLEUPDATECMDUI 0x0363 // wParam == bDisableIfNoHandler
#define WM_INITIALUPDATE 0x0364 // (params unused) - sent to children

在 afxpriv.h 里面怎么有定义呢？

[aguo2006]

LRESULT ExaTBar_2::OnIdleUpdateCmdUI(WPARAM wParam,LPARAM)
{
CToolBar::OnIdleUpdateCmdUI(wParam,0);

if(IsWindowVisible())
{
CFrameWnd * pParent = (CFrameWnd*)GetParent();
if(pParent)
OnUpdateCmdUI(pParent,(BOOL)wParam);
}

return 0L;
}

[syy64]

CControlBar::OnUpdateCmdUI
virtual void OnUpdateCmdUI( CFrameWnd* pTarget, BOOL bDisableIfNoHndler ) = 0;

Parameters

pTarget

Points to the main frame window of the application. This pointer is used for routing update messages.

bDisableIfNoHndler

Flag that indicates whether a control that has no update handler should be automatically displayed as disabled.

Remarks

This member function is called by the framework to update the status of the toolbar or status bar.

To update an individual button or pane, use the ON_UPDATE_COMMAND_UI macro in your message map to set an update handler appropriately. See ON_UPDATE_COMMAND_UI for more information about using this macro.

OnUpdateCmdUI is called by the framework when the application is idle. The frame window to be updated must be a child window, at least indirectly, of a visible frame window. OnUpdateCmdUI is an advanced overridable.

CControlBar Overview | Class Members | Hierarchy Chart

See Also ON_UPDATE_COMMAND_UI, Technical Note 31: Control Bars

[王国凡]

查了一下 MSDN :

WM_IDLEUPDATECMDUI
This message is sent in idle time to implement the idle-time update of update-command UI handlers. If the window (usually a control bar) handles the message, it creates a CCmdUI object (or an object of a derived class) and call CCmdUI::DoUpdate for each of the "items" in the window. This will in turn check for an ON_UPDATE_COMMAND_UI handler for the objects in the command-handler chain.

WM_INITIALUPDATE
This message is sent by the document template to all descendants of a frame window when it is safe for them to do their initial update. It maps to a call to CView::OnInitialUpdate but can be used in other CWnd-derived classes for other one-shot updating.