Re: Passing from a CDialog logic to a CView one
mosfet a ?crit :
mosfet a ?crit :
Hi,
I am developping with MFC under Pocket PC and for some technical reasons
I would like to convert an SDI application using a view and some
dialogs into one using only views.
Let's consider the following scenario :
I have my SDI application that display a welcome view(CFormView).
Inside this welcome view I have a button to accept or not Terms and
conditions.
If user accept conditions I would like to switch to the main view, if
not, I would like to display a goodbye view.
The problem is here :
void CWelcomeView::OnYesCommand()
{
if ( ... == TRUE){
CViewMgr::GetInstance()->SwitchView( IDD_MAINVIEW_DLG ); }
else{
CViewMgr::GetInstance()->SwitchView( IDD_GOODBYE_DLG ); }
}
SwitchView(at the end of this post)- is a method that :
1) Replace current view with the one given as parameter
2) Destroy the old view.
If we go back to the fonction above there will be a problem since
SwitchView is not asynchronous, it means that SwitchView will try to
replace and destroy the current view but we haven't still exist from
this function.
So it will crash everything.
I don't know if my explanation is clear if it's not tell me.
A first approach would be to declare two new methods
SetNexView that is asynchronous and put only a flag inside CViewMgr
ReleaseView()
and to put a thread inside my CViewMgr that will wait for an event
ReleaseView would set this event.
//Here is the example
void CWelcomeView::OnYesCommand()
{
if ( ... == TRUE){
CViewMgr::GetInstance()->SetNexView( IDD_MAINVIEW_DLG ); }
else{
CViewMgr::GetInstance()->SetNextView( IDD_GOODBYE_DLG ); }
CViewMgr::GetInstance()->ReleaseView();// Asynchronous
}
But if am not satisfied with this solution.
Any idea ????
Maybe I could also put my code to switch bewteen views inside my
MainFrame and CViewMgr::GetInstance()->SwitchView( IDD_MAINVIEW_DLG );
would only post a message, something like Sendmessage(SWITCHVIEW,
IDD_NEWVEW, 0);
What do you think ?
First I didn't want to do that because I wanted to separate
as much as I can UI to logic.
Actually I meant a Postmessage since Sendmessage is synchronous and
would not solve my issue.
I am still listening to your suggestions.
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