Access controls in child wxPanel Topic is solved

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apoc333
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Access controls in child wxPanel

Post by apoc333 » Fri Dec 08, 2006 7:55 am

Hi,

this is probably a very silly question but I can't figure out. I'm new to wxWidgets and have understood how events work. Now I want to access a wxTextCtrl from my main frame class. The object ist placed in an other class like wxPanel -> wxNotebook -> wxPanel(as notebook page) -> wxTextCtrl. Any help is very appreciated ;-)

Regards Apoc

Jorg
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Post by Jorg » Fri Dec 08, 2006 8:03 am

Hi,

Three approaches. If you are the one creating the controls, store them as a member variable in your class like;

Code: Select all

class MyFrame : public wxFrame
{
private:
   m_button *wxButton;
};

// and further down the road at creation:

m_button = new wxButton(...);
Or you could use FindWindowById, where you give the ID of the window and get a wxWindow pointer back. This can be (dynamically) casted to wxButton or any control you like, but has a potential hazard in the fact you can mis-cast the control, or the cast can return 0.

See
http://www.wxwidgets.org/manuals/2.6.3/ ... windowbyid

The last method is iterating over the wxPanel which will return all the wxWindow * elements on that panel. Only useful when you do not know what is on the wxPanel and you need to scan for the controls.

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- Jorgen
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apoc333
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Post by apoc333 » Fri Dec 08, 2006 8:17 am

Hi Jorg, thanks for the input!

I was playing arround with FindWindowById but didn't have in mind that wxTextCtrl is derived from wxWindow. Now I have a working solution. Is this the way to go or is there a better one?

Code: Select all

	wxTextCtrl* myTC;
	myTC = (wxTextCtrl*)this->FindWindowById(ID_MySQLADDRESS);
	wxMessageBox(myTC->GetValue());
Regards Apoc

S.Volkenandt
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Post by S.Volkenandt » Fri Dec 08, 2006 8:42 am

You should use a C++ style cast:

Code: Select all

wxTextCtrl* myTC = static_cast< wxTextCtrl* >(FindWindowById(ID_MySQLADDRESS)); // if you are _absolutely_ sure that FindWindowById(ID_MySQLADDRESS) will return a wxTextCtrl*
if (myTC == 0) { /* nope, this control was not found */ }
// or
wxTextCtrl* myTC = dynamic_cast< wxTextCtrl* >(FindWindowById(ID_MySQLADDRESS));
if (myTC == 0) { /* nope, this control was either not found or not a text control */ }

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