ON_UPDATE_COMMAND_UI problem...

[Remi Morin]

I used the ON_UPDATE_COMMAND_UI message in a DialogBar to display button, this fonction do nothing. It is only usefull to avoid my DialogBar to grayed my button so the message map look like this

BEGIN_MESSAGE_MAP(CVBurnBar, CDialogBar)
//{{AFX_MSG_MAP(CVBurnBar)
//...other message handler
ON_UPDATE_COMMAND_UI(IDC_Up_Normalize_AxisY, OnUpdateButton)
ON_UPDATE_COMMAND_UI(IDC_Bottom_Normalize_AxisY, OnUpdateButton)
ON_UPDATE_COMMAND_UI(IDC_Bottom_Adjust_Y, OnUpdateButton)
ON_UPDATE_COMMAND_UI(IDC_Up_Adjust_Y, OnUpdateButton)
//}}AFX_MSG_MAP
ON_MESSAGE(WM_INITDIALOG,OnInitDialog)
END_MESSAGE_MAP()

and the function

void CVBurnBar::OnUpdateButton(CCmdUI* /* pCmdUI*/)
{}

but theses message handler are called very often... what can I do to avoid this function to be call so often? Is there an other way to display button NOT GRAYED in a dialog bar whitout using the ON_UPDATE_COMMAND_UI. when I do MyButton.EnableWindow(true) if the ON_UPDATE_COMMAND_UI is not define for this button it is automatically grayed after 1/10 of a second... What I wan't is to display and grayed my button when I want... any idea? Remi Morin Rmorin@Operamail.com Remi.Morin@Lyrtech.com

[Tomasz Sowinski]

If you want your button to stay active all the time, do not create ON_UPDATE_COMMAND_UI - just ON_COMMAND handler. MFC scans through message maps during each idle cycle, which happens very often indeed. However, you shouldn't be worried much about that - it works the same way for toolbars, for example. Tomasz Sowinski -- http://www.shooltz.com

[Chambers]

You should be using ON_UPDATE_COMMAND_UI_RANGE(IDC_Up_Normalise_AxisY, IDC_Up_Adjust_Y, OnUpdateButton) provided the command IDs use that range. This maps the button handlers to the same function(OnUpdateButton), something it looks like your trying to do. The function does nothing because you haven`t said for it to do anything! I think that in the CVBurnBar function, if you change the parameter to (CCmdUI* pCmdUI) i.e no comments, then you should have control to change the button i.e gray it out etc (using pCmdUI->thefunctionyouwant). Also make sure the afx_msg void OnUpdateButton in the header file is changed to reflect this. To stop the button being grayed out at the start all you need to do is add a message map for ON_COMMAND_RANGE(IDC_Up_Normalise_AxisY, IDC_Up_Adjust_Y, TheFunctionYouWantToCallWhenButtonIsClicked). hope this helped slightly.:-D AEGC

[Carlos Antollini]

From MSDN: (TN031: Control Bars) CCmdUI Support for CDialogBar Dialog bar buttons should be updated through the ON_UPDATE_COMMAND_UI handler mechanism. At idle time, the dialog bar will call the ON_UPDATE_COMMAND_UI handler with the command ID of all the buttons that have a ID >= 0x8000 (that is, in the range of command IDs). The ON_UPDATE_COMMAND_UI handler can call: Enable: to enable or disable the button. SetText: to change the text of the button. Customization can be done through standard window manager APIs. Best Regards... Carlos Antollini. :bob: Today Is Friday!!! :beer: for All!!!

[Carlos Antollini]

You tried with

void CVBurnBar::OnUpdateButton(CCmdUI* /* pCmdUI*/)
{
CCmdUI->Enable();
}

Carlos Antollini.