docs/latex/wx/gupdlock.tex

   1 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   2 %% Name:        gupdlock.tex
   3 %% Purpose:     wxGridUpdateLocker documentation
   4 %% Author:      Evgeniy Tarassov
   5 %% Created:     2007-03-15
   6 %% RCS-ID:      $Id$
   7 %% Copyright:   (c) 2007 TT-Solutions SARL
   8 %% License:     wxWindows license
   9 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  10
  11 \section{\class{wxGridUpdateLocker}}\label{wxgridupdatelocker}
  12
  13 This small class can be used to prevent \helpref{wxGrid}{wxgrid} from redrawing
  14 during its lifetime by calling \helpref{wxGrid::BeginBatch}{wxgridbeginbatch}
  15 in its constructor and \helpref{wxGrid::EndBatch}{wxgridendbatch} in its
  16 destructor. It is typically used in a function performing several operations
  17 with a grid which would otherwise result in flicker. For example:
  18
  19 {\small
  20 \begin{verbatim}
  21     void MyFrame::Foo()
  22     {
  23         m_grid = new wxGrid(this, ...);
  24
  25         wxGridUpdateLocker noUpdates(m_grid);
  26         m_grid->AppendColumn();
  27         ... many other operations with m_grid...
  28         m_grid->AppendRow();
  29
  30         // destructor called, grid refreshed
  31     }
  32 \end{verbatim}
  33 }
  34
  35 Using this class is easier and safer than calling
  36 \helpref{BeginBatch}{wxgridbeginbatch} and \helpref{EndBatch}{wxgridendbatch}
  37 because you don't risk not to call the latter (due to an exception for example).
  38
  39 \wxheading{Derived from}
  40
  41 None.
  42
  43 \wxheading{Include files}
  44
  45 <wx/grid.h>
  46
  47
  48 \latexignore{\rtfignore{\wxheading{Members}}}
  49
  50
  51 \membersection{wxGridUpdateLocker::wxGridUpdateLocker}\label{wxgridupdatelockerctor}
  52
  53 \func{}{wxGridUpdateLocker}{\param{wxGrid *}{grid = \NULL}}
  54
  55 Creates an object preventing the updates of the specified \arg{grid}. The
  56 parameter could be \NULL in which case nothing is done. If \arg{grid} is
  57 non-\NULL then the grid must exist for longer than wxGridUpdateLocker object
  58 itself.
  59
  60 The default constructor could be followed by a call to
  61 \helpref{wxGridUpdateLocker::Create}{wxgridupdatelockercreate} to set the
  62 grid object later.
  63
  64
  65
  66 \membersection{wxGridUpdateLocker::\destruct{wxGridUpdateLocker}}\label{wxgridupdatelockerdtor}
  67
  68 \func{}{\destruct{wxGridUpdateLocker}}{\void}
  69
  70 Destructor reenables updates for the grid this object is associated with.
  71
  72
  73
  74 \membersection{wxGridUpdateLocker::Create}\label{wxgridupdatelockercreate}
  75
  76 \func{void}{Create}{\param{wxGrid* }{grid}}
  77
  78 This method can be called if the object had been constructed using the default
  79 constructor. It must not be called more than once.
  80
  81