57d7f9888e
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@45457 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
517 lines
18 KiB
TeX
517 lines
18 KiB
TeX
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%% Name: dialog.tex
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%% Purpose: wxDialog documentation
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%% Author: wxWidgets Team
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%% Modified by:
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%% Created:
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%% RCS-ID: $Id$
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%% Copyright: (c) wxWidgets Team
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%% License: wxWindows license
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\section{\class{wxDialog}}\label{wxdialog}
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A dialog box is a window with a title bar and sometimes a system menu, which
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can be moved around the screen. It can contain controls and other windows and
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is often used to allow the user to make some choice or to answer a question.
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\wxheading{Dialog Buttons}
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The dialog usually contains either a single button allowing to close the
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dialog or two buttons, one accepting the changes and the other one discarding
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them (such button, if present, is automatically activated if the user presses
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the \texttt{"Esc"} key). By default, buttons with the standard \texttt{wxID\_OK}
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and \texttt{wxID\_CANCEL} identifiers behave as expected. Starting with
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wxWidgets 2.7 it is also possible to use a button with a different identifier
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instead, see \helpref{SetAffirmativeId}{wxdialogsetaffirmativeid} and
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\helpref{SetEscapeId}{wxdialogsetescapeid}.
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Also notice that the \helpref{CreateButtonSizer()}{wxdialogcreatebuttonsizer}
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should be used to create the buttons appropriate for the current platform and
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positioned correctly (including their order which is platform-dependent).
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\wxheading{Derived from}
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\helpref{wxTopLevelWindow}{wxtoplevelwindow}\\
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\helpref{wxWindow}{wxwindow}\\
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\helpref{wxEvtHandler}{wxevthandler}\\
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\helpref{wxObject}{wxobject}
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\wxheading{Include files}
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<wx/dialog.h>
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\wxheading{Modal and modeless dialogs}
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There are two kinds of dialog -- {\it modal}\ and {\it modeless}. A modal dialog
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blocks program flow and user input on other windows until it is dismissed,
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whereas a modeless dialog behaves more like a frame in that program flow
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continues, and input in other windows is still possible. To show a modal dialog
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you should use the \helpref{ShowModal}{wxdialogshowmodal} method while to show
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a dialog modelessly you simply use \helpref{Show}{wxdialogshow}, just as with
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frames.
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Note that the modal dialog is one of the very few examples of
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wxWindow-derived objects which may be created on the stack and not on the heap.
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In other words, although this code snippet:
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\begin{verbatim}
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void AskUser()
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{
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MyAskDialog *dlg = new MyAskDialog(...);
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if ( dlg->ShowModal() == wxID_OK )
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...
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//else: dialog was cancelled or some another button pressed
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dlg->Destroy();
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}
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\end{verbatim}
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works, you can also achieve the same result by using a simpler code fragment
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below:
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\begin{verbatim}
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void AskUser()
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{
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MyAskDialog dlg(...);
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if ( dlg.ShowModal() == wxID_OK )
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...
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// no need to call Destroy() here
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}
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\end{verbatim}
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An application can define a \helpref{wxCloseEvent}{wxcloseevent} handler for
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the dialog to respond to system close events.
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\wxheading{Window styles}
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\twocolwidtha{5cm}
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\begin{twocollist}\itemsep=0pt
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\twocolitem{\windowstyle{wxCAPTION}}{Puts a caption on the dialog box.}
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\twocolitem{\windowstyle{wxDEFAULT\_DIALOG\_STYLE}}{Equivalent to a combination of wxCAPTION, wxCLOSE\_BOX and wxSYSTEM\_MENU (the last one is not used under Unix)}
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\twocolitem{\windowstyle{wxRESIZE\_BORDER}}{Display a resizeable frame around the window.}
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\twocolitem{\windowstyle{wxSYSTEM\_MENU}}{Display a system menu.}
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\twocolitem{\windowstyle{wxCLOSE\_BOX}}{Displays a close box on the frame.}
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\twocolitem{\windowstyle{wxMAXIMIZE\_BOX}}{Displays a maximize box on the dialog.}
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\twocolitem{\windowstyle{wxMINIMIZE\_BOX}}{Displays a minimize box on the dialog.}
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\twocolitem{\windowstyle{wxTHICK\_FRAME}}{Display a thick frame around the window.}
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\twocolitem{\windowstyle{wxSTAY\_ON\_TOP}}{The dialog stays on top of all other windows.}
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\twocolitem{\windowstyle{wxNO\_3D}}{Under Windows, specifies that the child controls
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should not have 3D borders unless specified in the control.}
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\twocolitem{\windowstyle{wxDIALOG\_NO\_PARENT}}{By default, a dialog created
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with a {\tt NULL} parent window will be given the
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\helpref{application's top level window}{wxappgettopwindow} as parent. Use this
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style to prevent this from happening and create an orphan dialog. This is not recommended for modal dialogs.}
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\twocolitem{\windowstyle{wxDIALOG\_EX\_CONTEXTHELP}}{Under Windows, puts a query button on the
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caption. When pressed, Windows will go into a context-sensitive help mode and wxWidgets will send
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a wxEVT\_HELP event if the user clicked on an application window. {\it Note}\ that this is an extended
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style and must be set by calling \helpref{SetExtraStyle}{wxwindowsetextrastyle} before Create is called (two-step construction).}
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\twocolitem{\windowstyle{wxDIALOG\_EX\_METAL}}{On Mac OS X, frames with this style will be shown with a metallic look. This is an {\it extra} style.}
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\end{twocollist}
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Under Unix or Linux, MWM (the Motif Window Manager) or other window managers
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recognizing the MHM hints should be running for any of these styles to have an
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effect.
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See also \helpref{Generic window styles}{windowstyles}.
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\wxheading{See also}
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\helpref{wxDialog overview}{wxdialogoverview}, \helpref{wxFrame}{wxframe},\rtfsp
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\helpref{Validator overview}{validatoroverview}
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\latexignore{\rtfignore{\wxheading{Members}}}
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\membersection{wxDialog::wxDialog}\label{wxdialogctor}
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\func{}{wxDialog}{\void}
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Default constructor.
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\func{}{wxDialog}{\param{wxWindow* }{parent}, \param{wxWindowID }{id},\rtfsp
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\param{const wxString\& }{title},\rtfsp
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\param{const wxPoint\& }{pos = wxDefaultPosition},\rtfsp
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\param{const wxSize\& }{size = wxDefaultSize},\rtfsp
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\param{long}{ style = wxDEFAULT\_DIALOG\_STYLE},\rtfsp
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\param{const wxString\& }{name = ``dialogBox"}}
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Constructor.
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\wxheading{Parameters}
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\docparam{parent}{Can be NULL, a frame or another dialog box.}
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\docparam{id}{An identifier for the dialog. A value of -1 is taken to mean a default.}
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\docparam{title}{The title of the dialog.}
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\docparam{pos}{The dialog position. A value of (-1, -1) indicates a default position, chosen by
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either the windowing system or wxWidgets, depending on platform.}
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\docparam{size}{The dialog size. A value of (-1, -1) indicates a default size, chosen by
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either the windowing system or wxWidgets, depending on platform.}
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\docparam{style}{The window style. See \helpref{wxDialog}{wxdialog}.}
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\docparam{name}{Used to associate a name with the window,
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allowing the application user to set Motif resource values for
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individual dialog boxes.}
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\wxheading{See also}
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\helpref{wxDialog::Create}{wxdialogcreate}
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\membersection{wxDialog::\destruct{wxDialog}}\label{wxdialogdtor}
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\func{}{\destruct{wxDialog}}{\void}
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Destructor. Deletes any child windows before deleting the physical window.
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\membersection{wxDialog::Centre}\label{wxdialogcentre}
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\func{void}{Centre}{\param{int}{ direction = wxBOTH}}
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Centres the dialog box on the display.
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\wxheading{Parameters}
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\docparam{direction}{May be {\tt wxHORIZONTAL}, {\tt wxVERTICAL} or {\tt wxBOTH}.}
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\membersection{wxDialog::Create}\label{wxdialogcreate}
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\func{bool}{Create}{\param{wxWindow* }{parent}, \param{wxWindowID }{id},\rtfsp
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\param{const wxString\& }{title},\rtfsp
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\param{const wxPoint\& }{pos = wxDefaultPosition},\rtfsp
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\param{const wxSize\& }{size = wxDefaultSize},\rtfsp
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\param{long}{ style = wxDEFAULT\_DIALOG\_STYLE},\rtfsp
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\param{const wxString\& }{name = ``dialogBox"}}
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Used for two-step dialog box construction. See \helpref{wxDialog::wxDialog}{wxdialogctor}\rtfsp
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for details.
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\membersection{wxDialog::CreateButtonSizer}\label{wxdialogcreatebuttonsizer}
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\func{wxSizer*}{CreateButtonSizer}{\param{long}{ flags}}
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Creates a sizer with standard buttons. {\it flags} is a bit list
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of the following flags: wxOK, wxCANCEL, wxYES, wxNO, wxAPPLY, wxCLOSE,
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wxHELP, wxNO\_DEFAULT.
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The sizer lays out the buttons in a manner appropriate to the platform.
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This function uses \helpref{CreateStdDialogButtonSizer}{wxdialogcreatestddialogbuttonsizer}
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internally for most platforms but doesn't create the sizer at all for the
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platforms with hardware buttons (such as smartphones) for which it sets up the
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hardware buttons appropriately and returns \NULL, so don't forget to test that
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the return value is valid before using it.
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\membersection{wxDialog::CreateSeparatedButtonSizer}\label{wxdialogcreateseparatedbuttonsizer}
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\func{wxSizer*}{CreateSeparatedButtonSizer}{\param{long}{ flags}}
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Creates a sizer with standard buttons using
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\helpref{CreateButtonSizer}{wxdialogcreatebuttonsizer} separated from the rest
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of the dialog contents by a horizontal \helpref{wxStaticLine}{wxstaticline}.
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Please notice that just like CreateButtonSizer() this function may return \NULL
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if no buttons were created.
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\membersection{wxDialog::CreateStdDialogButtonSizer}\label{wxdialogcreatestddialogbuttonsizer}
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\func{wxStdDialogButtonSizer*}{CreateStdDialogButtonSizer}{\param{long}{ flags}}
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Creates a \helpref{wxStdDialogButtonSizer}{wxstddialogbuttonsizer} with standard buttons. {\it flags} is a bit list
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of the following flags: wxOK, wxCANCEL, wxYES, wxNO, wxAPPLY, wxCLOSE,
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wxHELP, wxNO\_DEFAULT.
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The sizer lays out the buttons in a manner appropriate to the platform.
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\membersection{wxDialog::DoOK}\label{wxdialogdook}
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\func{virtual bool}{DoOK}{\void}
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This function is called when the titlebar OK button is pressed (PocketPC only).
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A command event for the identifier returned by GetAffirmativeId is sent by
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default. You can override this function. If the function returns false, wxWidgets
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will call Close() for the dialog.
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\membersection{wxDialog::EndModal}\label{wxdialogendmodal}
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\func{void}{EndModal}{\param{int }{retCode}}
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Ends a modal dialog, passing a value to be returned from the \helpref{wxDialog::ShowModal}{wxdialogshowmodal}\rtfsp
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invocation.
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\wxheading{Parameters}
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\docparam{retCode}{The value that should be returned by {\bf ShowModal}.}
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\wxheading{See also}
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\helpref{wxDialog::ShowModal}{wxdialogshowmodal},\rtfsp
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\helpref{wxDialog::GetReturnCode}{wxdialoggetreturncode},\rtfsp
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\helpref{wxDialog::SetReturnCode}{wxdialogsetreturncode}
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\membersection{wxDialog::GetAffirmativeId}\label{wxdialoggetaffirmativeid}
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\constfunc{int}{GetAffirmativeId}{\void}
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Gets the identifier of the button which works like standard OK button in this
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dialog.
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\wxheading{See also}
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\helpref{wxDialog::SetAffirmativeId}{wxdialogsetaffirmativeid}
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\membersection{wxDialog::GetEscapeId}\label{wxdialoggetescapeid}
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\constfunc{int}{GetEscapeId}{\void}
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Gets the identifier of the button to map presses of \texttt{\textsc{ESC}}
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button to.
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\wxheading{See also}
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\helpref{wxDialog::SetEscapeId}{wxdialogsetescapeid}
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\membersection{wxDialog::GetReturnCode}\label{wxdialoggetreturncode}
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\func{int}{GetReturnCode}{\void}
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Gets the return code for this window.
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\wxheading{Remarks}
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A return code is normally associated with a modal dialog, where \helpref{wxDialog::ShowModal}{wxdialogshowmodal} returns
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a code to the application.
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\wxheading{See also}
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\helpref{wxDialog::SetReturnCode}{wxdialogsetreturncode}, \helpref{wxDialog::ShowModal}{wxdialogshowmodal},\rtfsp
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\helpref{wxDialog::EndModal}{wxdialogendmodal}
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\membersection{wxDialog::GetToolBar}\label{wxdialoggettoolbar}
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\constfunc{wxToolBar*}{GetToolBar}{\void}
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On PocketPC, a dialog is automatically provided with an empty toolbar. GetToolBar
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allows you to access the toolbar and add tools to it. Removing tools and adding
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arbitrary controls are not currently supported.
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This function is not available on any other platform.
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\membersection{wxDialog::Iconize}\label{wxdialogiconized}
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\func{void}{Iconize}{\param{const bool}{ iconize}}
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Iconizes or restores the dialog. Windows only.
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\wxheading{Parameters}
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\docparam{iconize}{If true, iconizes the dialog box; if false, shows and restores it.}
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\wxheading{Remarks}
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Note that in Windows, iconization has no effect since dialog boxes cannot be
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iconized. However, applications may need to explicitly restore dialog
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boxes under Motif which have user-iconizable frames, and under Windows
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calling {\tt Iconize(false)} will bring the window to the front, as does
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\rtfsp{\tt Show(true)}.
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\membersection{wxDialog::IsIconized}\label{wxdialogisiconized}
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\constfunc{bool}{IsIconized}{\void}
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Returns true if the dialog box is iconized. Windows only.
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\wxheading{Remarks}
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Always returns false under Windows since dialogs cannot be iconized.
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\membersection{wxDialog::IsModal}\label{wxdialogismodal}
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\constfunc{bool}{IsModal}{\void}
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Returns true if the dialog box is modal, false otherwise.
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\membersection{wxDialog::OnSysColourChanged}\label{wxdialogonsyscolourchanged}
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\func{void}{OnSysColourChanged}{\param{wxSysColourChangedEvent\& }{event}}
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The default handler for wxEVT\_SYS\_COLOUR\_CHANGED.
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\wxheading{Parameters}
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\docparam{event}{The colour change event.}
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\wxheading{Remarks}
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Changes the dialog's colour to conform to the current settings (Windows only).
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Add an event table entry for your dialog class if you wish the behaviour
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to be different (such as keeping a user-defined
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background colour). If you do override this function, call wxEvent::Skip to
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propagate the notification to child windows and controls.
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\wxheading{See also}
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\helpref{wxSysColourChangedEvent}{wxsyscolourchangedevent}
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\membersection{wxDialog::SetAffirmativeId}\label{wxdialogsetaffirmativeid}
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\func{void}{SetAffirmativeId}{\param{int }{id}}
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Sets the identifier to be used as OK button. When the button with this
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identifier is pressed, the dialog calls \helpref{Validate}{wxwindowvalidate}
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and \helpref{wxWindow::TransferDataFromWindow}{wxwindowtransferdatafromwindow}
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and, if they both return \true, closes the dialog with \texttt{wxID\_OK} return
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code.
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Also, when the user presses a hardware OK button on the devices having one or
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the special OK button in the PocketPC title bar, an event with this id is
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generated.
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By default, the affirmative id is wxID\_OK.
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\wxheading{See also}
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\helpref{wxDialog::GetAffirmativeId}{wxdialoggetaffirmativeid}, \helpref{wxDialog::SetEscapeId}{wxdialogsetescapeid}
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\membersection{wxDialog::SetEscapeId}\label{wxdialogsetescapeid}
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\func{void}{SetEscapeId}{\param{int }{id}}
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Sets the identifier of the button which should work like the standard
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\texttt{\textsc{Cancel}} button in this dialog. When the button with this id is
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clicked, the dialog is closed. Also, when the user presses \texttt{\textsc{ESC}}
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key in the dialog or closes the dialog using the close button in the title bar,
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this is mapped to the click of the button with the specified id.
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By default, the escape id is the special value \texttt{wxID\_ANY} meaning that
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\texttt{wxID\_CANCEL} button is used if it's present in the dialog and
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otherwise the button with \helpref{GetAffirmativeId()}{wxdialoggetaffirmativeid}
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is used. Another special value for \arg{id} is \texttt{wxID\_NONE} meaning that
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\texttt{\textsc{ESC}} presses should be ignored. If any other value is given, it
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is interpreted as the id of the button to map the escape key to.
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\membersection{wxDialog::SetIcon}\label{wxdialogseticon}
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\func{void}{SetIcon}{\param{const wxIcon\& }{icon}}
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Sets the icon for this dialog.
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\wxheading{Parameters}
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\docparam{icon}{The icon to associate with this dialog.}
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See also \helpref{wxIcon}{wxicon}.
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\membersection{wxDialog::SetIcons}\label{wxdialogseticons}
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\func{void}{SetIcons}{\param{const wxIconBundle\& }{icons}}
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Sets the icons for this dialog.
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\wxheading{Parameters}
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\docparam{icons}{The icons to associate with this dialog.}
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See also \helpref{wxIconBundle}{wxiconbundle}.
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\membersection{wxDialog::SetModal}\label{wxdialogsetmodal}
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\func{void}{SetModal}{\param{const bool}{ flag}}
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{\bf NB:} This function is deprecated and doesn't work for all ports, just use
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\helpref{ShowModal}{wxdialogshowmodal} to show a modal dialog instead.
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Allows the programmer to specify whether the dialog box is modal (wxDialog::Show blocks control
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until the dialog is hidden) or modeless (control returns immediately).
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\wxheading{Parameters}
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\docparam{flag}{If true, the dialog will be modal, otherwise it will be modeless.}
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\membersection{wxDialog::SetReturnCode}\label{wxdialogsetreturncode}
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\func{void}{SetReturnCode}{\param{int }{retCode}}
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Sets the return code for this window.
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\wxheading{Parameters}
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\docparam{retCode}{The integer return code, usually a control identifier.}
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\wxheading{Remarks}
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A return code is normally associated with a modal dialog, where \helpref{wxDialog::ShowModal}{wxdialogshowmodal} returns
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a code to the application. The function \helpref{wxDialog::EndModal}{wxdialogendmodal} calls {\bf SetReturnCode}.
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\wxheading{See also}
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\helpref{wxDialog::GetReturnCode}{wxdialoggetreturncode}, \helpref{wxDialog::ShowModal}{wxdialogshowmodal},\rtfsp
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\helpref{wxDialog::EndModal}{wxdialogendmodal}
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\membersection{wxDialog::Show}\label{wxdialogshow}
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\func{bool}{Show}{\param{const bool}{ show}}
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Hides or shows the dialog.
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\wxheading{Parameters}
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\docparam{show}{If true, the dialog box is shown and brought to the front;
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otherwise the box is hidden. If false and the dialog is
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modal, control is returned to the calling program.}
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\wxheading{Remarks}
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The preferred way of dismissing a modal dialog is to use \helpref{wxDialog::EndModal}{wxdialogendmodal}.
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\membersection{wxDialog::ShowModal}\label{wxdialogshowmodal}
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\func{int}{ShowModal}{\void}
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Shows a modal dialog. Program flow does not return until the dialog has been dismissed with\rtfsp
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\helpref{wxDialog::EndModal}{wxdialogendmodal}.
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\wxheading{Return value}
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The return value is the value set with \helpref{wxDialog::SetReturnCode}{wxdialogsetreturncode}.
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\wxheading{See also}
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\helpref{wxDialog::EndModal}{wxdialogendmodal},\rtfsp
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\helpref{wxDialog:GetReturnCode}{wxdialoggetreturncode},\rtfsp
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\helpref{wxDialog::SetReturnCode}{wxdialogsetreturncode}
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