wupdlock.tex

来自「很牛的GUI源码wxWidgets-2.8.0.zip 可在多种平台下运行.」· TEX 代码 · 共 63 行

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%% Name:        wupdlock.tex
%% Purpose:     wxWindowUpdateLocker documentation
%% Author:      Vadim Zeitlin
%% Modified by:
%% Created:     2006-03-06
%% RCS-ID:      $Id: wupdlock.tex,v 1.1 2006/03/07 01:50:21 VZ Exp $
%% Copyright:   (c) 2006 Vadim Zeitlin <[e-mail]>
%% License:     wxWindows license
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\section{\class{wxWindowUpdateLocker}}\label{wxwindowupdatelocker}

This tiny class prevents redrawing of a \helpref{wxWindow}{wxwindow} during its
lifetime by using \helpref{wxWindow::Freeze}{wxwindowfreeze} and 
\helpref{Thaw}{wxwindowthaw} methods. It is typically used for creating
automatic objects to temporarily suppress window updates before a batch of
operations is performed:
{\small
\begin{verbatim}
    void MyFrame::Foo()
    {
        m_text = new wxTextCtrl(this, ...);

        wxWindowUpdateLocker noUpdates(m_text);
        m_text->AppendText();
        ... many other operations with m_text...
        m_text->WriteText();
    }
\end{verbatim}
}

Using this class is easier and safer than calling 
\helpref{Freeze}{wxwindowfreeze} and \helpref{Thaw}{wxwindowthaw} because you
don't risk to forget calling the latter.

\wxheading{Derived from}

None.

\wxheading{Include files}

<wx/wupdlock.h>

\latexignore{\rtfignore{\wxheading{Members}}}


\membersection{wxWindowUpdateLocker::wxWindowUpdateLocker}\label{wxwindowupdatelockerctor}

\func{}{wxWindowUpdateLocker}{\param{wxWindow *}{win}}

Creates an object preventing the updates of the specified \arg{win}. The
parameter must be non-\NULL and the window must exist for longer than
wxWindowUpdateLocker object itself.


\membersection{wxWindowUpdateLocker::\destruct{wxWindowUpdateLocker}}\label{wxwindowupdatelockerdtor}

\func{}{\destruct{wxWindowUpdateLocker}}{\void}

Destructor reenables updates for the window this object is associated with.