C / C++ / MFC

Re: Broadcasting the command

22-Feb-02 6:23

I have an MFC app with one CMainFrame, one doc, and multiple views, each view is associated with the same doc but different child frames (CMDIChildFrame).Each view handle certain set of manu commands.

If I have updated the doc's data thru one of the views, how do I broadcast the command so that other views can respond the command?

Tim Smith22-Feb-02 6:30

Re: Broadcasting the command: Problem with UpdateAllViews()

22-Feb-02 6:30

You can invoke the UpdateAllViews method of CDocument.

Tim Smith

I know what you're thinking punk, you're thinking did he spell check this document? Well, to tell you the truth I kinda forgot myself in all this excitement. But being this here's CodeProject, the most powerful forums in the world and would blow your head clean off, you've got to ask yourself one question, Do I feel lucky? Well do ya punk?

yellowine22-Feb-02 6:34

Re: Broadcasting the command: Problem with UpdateAllViews()

22-Feb-02 6:34

Yes, UpdateAllViews() informs all other views to update their contents. What about if I want other views to respond in a way like following:

if ID_COMMAND1 is send by pView1

then I want:

pView2->WelcomeYou();
pView3->MakeDinnerForYou();
...
pViewn->GoFishing()..

Any idea?

Tim Smith22-Feb-02 6:46

Re: Broadcasting the command: Problem with UpdateAllViews()

22-Feb-02 6:46

Other than using the hint parameters, no, I don't have any ideas. Not totally sure what you want.

If X happens in view 1, then you want view 2 to do Y, view 3 to do Z, etc, then the hint parameters should work.

Tim Smith

I know what you're thinking punk, you're thinking did he spell check this document? Well, to tell you the truth I kinda forgot myself in all this excitement. But being this here's CodeProject, the most powerful forums in the world and would blow your head clean off, you've got to ask yourself one question, Do I feel lucky? Well do ya punk?

Nish Nishant22-Feb-02 9:18

Nish Nishant

22-Feb-02 9:18

yellowine wrote:

if ID_COMMAND1 is send by pView1

then I want:

pView2->WelcomeYou();
pView3->MakeDinnerForYou();
...
pViewn->GoFishing()..

I think you might maintain a global stack of messages and handle them individually in the individual views iterating through each message in the stack. Push only those msgs into the stack that you wish to have handlers for in the different views.

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Re: Broadcasting the command: Problem with UpdateAllViews()

yellowine22-Feb-02 10:35

Re: Broadcasting the command: Problem with UpdateAllViews()

22-Feb-02 10:35

Good idea. Thanks.

pba_22-Feb-02 10:40

pba_

22-Feb-02 10:40

Something like this ?

CMyMainWnd::OnCommand1()
{
CMyDoc* pDoc = GetActiveDocument();

POSITION pos = pDoc->GetFirstViewPosition();
while( pos )
{
pView = pDoc->GetNextView( &pos);
if( pView->IsKindOf(RUNTIME_CLASS(CMyView1)))
{
((CMyView1*)pView)->WelcomeYou();
}
....etc
}
}

Re: Broadcasting the command: Problem with UpdateAllViews()

yellowine22-Feb-02 10:42

Re: Broadcasting the command: Problem with UpdateAllViews()

22-Feb-02 10:42

Thanks for your idea. I do think this approach works except a maintainence problem. Any time I add a view or I have a new command which will cause a train reaction for other view, I have to add a new handler in the CMyMainFrame or add a new IsKindOf(..) in the while loop, right?

pba_22-Feb-02 12:04

pba_

22-Feb-02 12:04

Or you can send the message to each view ...
//
while(....)
{
pView->SendMessage( );
}

and each view will process the message in his own way.

Re: Broadcasting the command

22-Feb-02 7:00

Think about overriding OnCmdMsg( )and route the messages yourself.

Re: Broadcasting the command

yellowine22-Feb-02 10:36

Deallocating Tree Control Data

22-Feb-02 10:36

I will take this approach and give it a try.

Thanks.

Aaron Schaefer22-Feb-02 6:17

Aaron Schaefer

22-Feb-02 6:17

Hi There,

I have a question about tree controls. If I set a tree item's data to something like a pointer to a class or something, when is the appropriate time to delete the pointer?

This is inside a dialog bar which houses the tree control.

Thanks,

Aaron

Tim Smith22-Feb-02 6:19

22-Feb-02 6:19

When you receive a TVN_DELETEITEM notification for an element in the tree control. That is by far the best way.

Tim Smith

I know what you're thinking punk, you're thinking did he spell check this document? Well, to tell you the truth I kinda forgot myself in all this excitement. But being this here's CodeProject, the most powerful forums in the world and would blow your head clean off, you've got to ask yourself one question, Do I feel lucky? Well do ya punk?

Aaron Schaefer22-Feb-02 6:20

Aaron Schaefer

22-Feb-02 6:20

OK, thanks. I suppose this is sent out both when a single item is deleted from an active tree control and during the destruction of the entire control?

Tim Smith22-Feb-02 6:29

22-Feb-02 6:29

When you delete the control, TVN_DELETEITEM will be sent for each item in the control. It sounds excessive, but it works just fine.

Tim Smith

I know what you're thinking punk, you're thinking did he spell check this document? Well, to tell you the truth I kinda forgot myself in all this excitement. But being this here's CodeProject, the most powerful forums in the world and would blow your head clean off, you've got to ask yourself one question, Do I feel lucky? Well do ya punk?