adding functions to the close event

[stevee]

Hi,
I have a problem with the close event, that means I don't know how to 'catch' this close event in order to add some functions. Thus, what happens when I click the close button, which function is called and how can I add some code to this close function. I tried to use a wxWidgets EVT_CLOSE macro in the EVENT_TABLE, but it is not working.

Following I try to specify what I intend to do again in other words.
I derived a class from wxPanel and added it with m_mgr.AddPane to a wxMDIParentFrame. When I am closing the panel with the automatically generated close button the panel is closing - every thing is fine so far.
But I would like to add a function when closing the panel that checks a menu item, for instance. How can I do this?

Hope that was not to confusing and thanks for answers.
Stevee

[abligh]

Hi,
I have a problem with the close event, that means I don't know how to 'catch' this close event in order to add some functions. Thus, what happens when I click the close button, which function is called and how can I add some code to this close function. I tried to use a wxWidgets EVT_CLOSE macro in the EVENT_TABLE, but it is not working.

Following I try to specify what I intend to do again in other words.
I derived a class from wxPanel and added it with m_mgr.AddPane to a wxMDIParentFrame. When I am closing the panel with the automatically generated close button the panel is closing - every thing is fine so far.
But I would like to add a function when closing the panel that checks a menu item, for instance. How can I do this?

Hope that was not to confusing and thanks for answers.
Stevee

If you are trying to get this to work from a floating pane, you might want to make wxFloatingPane::OnClose do something like the following. If you have a docked panel with a closebox, you will need to make a similar adjustment.

Note that (in my opinion) we need to do a lot more work to get close events handled properly. For instance we need the standard veto behaviour captured.

Code: Select all

    void OnClose(wxCloseEvent& event)
    {
        static wxList s_closing;

        EnsureSizeRecorded();

        if (!s_closing.Member(this))
        {
            s_closing.Append(this);

            wxCommandEvent cancelEvent(wxEVT_COMMAND_BUTTON_CLICKED, wxID_CANCEL);
            cancelEvent.SetEventObject( m_pane_window );
            m_pane_window->GetEventHandler()->ProcessEvent(cancelEvent);
            s_closing.DeleteObject(this);
            // we should really return here without doing anything if the close was vetoed
        }

        m_owner_mgr->OnFloatingPaneClosed(m_pane_window);
        Destroy();
    }


[stevee]

Thanks so far, but I encounter still some compiler errors.

I added the (modified) code you posted in my wxMDIParentFrame and linked it with EVT_CLOSE in the event table.

The first compiler error:
'EnsureSizeRecorded': identifier not found
What does the 'EnsureSizeRecorded()' command mean?

The second problem occurs when I try to use the wxFrameManager from the wxMDIParentFrame. In my case it is m_mgr.
m_mgr->OnFloatingPaneClosed(pcp_frame);
// pcp_frame is an instance of my wxPanel. It is a docked panel with a closebox.
Compiler error: left of -> OnFloatingPaneClosed must point to class/struct/union