Help! SetActiveView problem

I am using the explorer type interface with a treeview on the left and listview on the right side. I added right click context menu support for my treeview. When I right click treeview item, I need to do something in my listview. The problem is while the focus is on the treeview I can't seem to make some normal function call work. for example, GetListCtrl()->GetItemCount always returns 0 value.

I was trying to fix this problem by setting listview as the active view:

////////////////////////////////////////////////////////////////////////////////////////////////
CMyListView* pChildView;
GetParentFrame()->SetActiveView(pChildView, TRUE); // assertion failed error right here!!!

GetListCtrl()->GetItemCount( );
////////////////////////////////////////////////////////////////////////////////////////////

So what should I do to set focus to my listview?

Thanks,
Coco

Hi there!

It seems you have passed an uninitialized pointer to the SetActiveView-function.
That might have caused the assertion failure.

CMyView* pView; // this only declares a pointer to a CMyView-class
// however it doesn't yet point to your view!!
GetActiveFrame()->SetActiveView (pView, ...);

The cure might be to initialize the pointer with a GetActiveView() (or similar) function.
Depends on from where you want to get a pointer to your view.

I.e.
CMyView* pView = (CMyView*) GetActiveView();

Hope this helps.
Best regards.
Alan.

Thank you. Like you suggested, I made some changes, no assertion error but...


CMyListView* pView = (CMyListView*)GetParentFrame()-> GetActiveView();
// pView points to treeview??
GetParentFrame()->SetActiveView(pView, TRUE); // assertion failed right here before

CMyListView is a class derived from CListView. If using GetActiveView(), I can only get a pointer points to my treeview which has the current focus (this's not what I what to do).

How can I set my list view as the active view? Hope I am not confusing you more.

Call stack traces error back to:

************************************
void CFrameWnd::SetActiveView(CView* pViewNew, BOOL bNotify)
{
#ifdef _DEBUG
if (pViewNew != NULL)
{
ASSERT(IsChild(pViewNew)); // failed here!
ASSERT_KINDOF(CView, pViewNew);
}

In your frame, you ahve to SAVE a pointer to the TreeView and to the ListView and then use them

Sally

Hi there again!

Well, I'm not quite sure from where you want to set your CMyListView as active view.
I.e. from within your Document-class or from within your Mainframe-class...?
And have you created your views ("explorerlike" you said, right?!) in a splitter-wnd?

If you have set up your views within a splitter-window, you usually create them in the
OnCreateClient-function of your CChildFrame-Class (MDI) or something like that.
Further, you should have created a CSplitterWnd as a member of the CChildFrame-Class. (let's assume you called it m_SplitWnd).

Then you could get a pointer to your CMyListView like this:

CMyListView* pView = (CMyListView*) m_SplitWnd.GetPane ( /* row, column */ );

Well, it gets more complicated if you have not set up a splitter window.
However, you could iterate through the views that are attached to your document
(from within your document) using the GetFirstView(), and GetNextView()-Functions.

Hope this helps.
Regards.
Alan.

Thanks for your quick response!

It is working now. thanks again for your help.