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CPropertySheets and parent dialogs

Posted on 2003-11-25
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Last Modified: 2013-11-20
Hi All,

I have a Parent CDialog.

This CDialog has a CPropertyPage

The CPropertyPage has two CPropertySheets

Now be it due to necessity or bad design on my part, i need to call a method (update some controls) on the parent CDialog from within my CPropertySheet.

The CPropertySheets are static CDialogs which are now inherited from CPropertySheet.

I have thought of passing the 'this' parameter in the property sheet constructor, but I get a circular error with the include files.

What would be the easiest solution for calling a member function of my parent CDialog from my CPropertySheet


Txs
0
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Question by:Pete2003
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4 Comments
 
LVL 13

Expert Comment

by:SteH
ID: 9818648
Depends a bit on how the classes are defined. If in one class only pointer needs to be known a simple forward declaration is sufficient:
class CMyDialog;
class CMyPropertySheet {
};

Is there a guard around the header file?
#ifndef filename_h
#define filename_h

header file content.

#endif

This prevents the file from beeing included twice. I think the guard should always be present.

Do you really need a method of the parent to be called or would it be sufficient to post the parent a message?
0
 

Author Comment

by:Pete2003
ID: 9823103
There is a guard already ... but because I'm using pointers to the classes inside the child classes the parent class is then undefined.

My question was however more specific. How can I make calls on the PropertyPage or even the parent dialog from the property sheet
0
 
LVL 13

Accepted Solution

by:
SteH earned 125 total points
ID: 9823148
To get rid of the undefined class you can use forward declaration. The following compiles without problems.

class b;  // forward declaration for class b. In case of a 2 header files have it before either class.
class a    // In class a you can now use a pointer to class b.
{
public:
    a () {};
    ~a () {};
    double funa (double d1);
    class b* pb;
};

class b
{
public:
    b () {};
    ~b () {};
    int funb (int i1);
    class a* pa;
};

double a::funa (double d1) {
    return d1 * .5;
}

int b::funb (int i1) {
    return i1 + 5;
}

Another approach is to post a (user defined) message to the main wnd (= parent dlg) or the parent wnd (=PropertyPage):


0
 

Author Comment

by:Pete2003
ID: 9823760
Ok that wan't really help me since both these classes inherit from diffrent places so it's a bit more complicated, so I'll have to redesign ...  but here are the points anyway :)
0

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