wxBusyInfo Class Reference

#include <wx/busyinfo.h>

Detailed Description

This class makes it easy to tell your user that the program is temporarily busy.

Normally the main thread should always return to the main loop to continue dispatching events as quickly as possible, hence this class shouldn't be needed. However if the main thread does need to block, this class provides a simple way to at least show this to the user: just create a wxBusyInfo object on the stack, and within the current scope, a message window will be shown.

For example:

wxBusyInfo wait("Please wait, working...");

for (int i = 0; i < 100000; i++)
{
    DoACalculation();
}

It works by creating a window in the constructor, and deleting it in the destructor.

This window is rather plain by default but can be customized by passing wxBusyInfo constructor an object of wxBusyInfoFlags class instead of a simple message. Here is an example from the dialogs sample:

wxBusyInfo info
    (
        wxBusyInfoFlags()
            .Parent(this)
            .Icon(wxArtProvider::GetIcon(wxART_PRINT,
                                         wxART_OTHER, wxSize(128, 128)))
            .Title("<b>Printing your document</b>")
            .Text("Please wait...")
            .Foreground(*wxWHITE)
            .Background(*wxBLACK)
            .Transparency(4*wxALPHA_OPAQUE/5)
    );

This shows that separate title and text can be set, and that simple markup (wxControl::SetLabelMarkup()) can be used in them, and that it's also possible to add an icon and customize the colours and transparency of the window.

You may also want to call wxTheApp->Yield() to refresh the window periodically (in case it had been obscured by other windows, for example) like this:

wxWindowDisabler disableAll;
wxBusyInfo wait("Please wait, working...");

for (int i = 0; i < 100000; i++)
{
    DoACalculation();

    if ( !(i % 1000) )
        wxTheApp->Yield();
}

but take care to not cause undesirable reentrancies when doing it (see wxApp::Yield for more details). The simplest way to do it is to use wxWindowDisabler class as illustrated in the above example.

Note that a wxBusyInfo is always built with the wxSTAY_ON_TOP window style (see wxFrame window styles for more info).

Library:  wxCore

Category:  Common Dialogs

Public Member Functions
	wxBusyInfo (const wxBusyInfoFlags &flags)
	General constructor. More...
	wxBusyInfo (const wxString &msg, wxWindow *parent=NULL)
	Simple constructor specifying only the message and the parent. More...
virtual	~wxBusyInfo ()
	Hides and closes the window containing the information text. More...

Constructor & Destructor Documentation

wxBusyInfo::wxBusyInfo

(

const wxBusyInfoFlags &

flags

)

General constructor.

This constructor allows to specify all supported attributes by calling the appropriate methods on wxBusyInfoFlags object passed to it as parameter. All of them are optional but usually at least the message should be specified.

Since

3.1.0

wxBusyInfo::wxBusyInfo	(	const wxString &	msg,
		wxWindow *	parent = NULL
	)

Simple constructor specifying only the message and the parent.

This constructs a busy info window as child of parent and displays msg in it. It is exactly equivalent to using

wxBusyInfo(wxBusyInfoFlags().Parent(parent).Label(message))

Note

If parent is not NULL you must ensure that it is not closed while the busy info is shown.

virtual wxBusyInfo::~wxBusyInfo ( )

virtual

Hides and closes the window containing the information text.