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added a section about wxTextCtrl indices

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@17467 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin
2002-10-06 19:44:33 +00:00
parent cea0b70615
commit 26f10d1c2b
1 changed files with 26 additions and 2 deletions
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28
docs/latex/wx/text.tex
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@@ -125,6 +125,29 @@ it to always show it. It doesn't do anything under other platforms.}
See also \helpref{window styles overview}{windowstyles} and See also \helpref{window styles overview}{windowstyles} and
\helpref{wxTextCtrl::wxTextCtrl}{wxtextctrlconstr}. \helpref{wxTextCtrl::wxTextCtrl}{wxtextctrlconstr}.
\wxheading{wxTextCtrl text format}
The multiline text controls always store the text as a sequence of lines
separated by {\tt $\backslash$n} characters, i.e. in the Unix text format even
on non-Unix platforms. This allows the user code to ignore the differences
between the platforms but at a price: the indices in the control such as those
returned by \helpref{GetInsertionPoint}{wxtextctrlgetinsertionpoint} or
\helpref{GetSelection}{wxtextctrlgetselection} can {\bf not} be used as
indices into the string returned by \helpref{GetValue}{wxtextctrlgetvalue} as
they're going to be slightly off for platforms using
{\tt $\backslash$r$\backslash$n} as separator (as Windows does), for example.
Instead, if you need to obtain a substring between the $2$ indices obtained
from the control with the help of the functions mentioned above, you should
use \helpref{GetRange}{wxtextctrlgetrange}. And the indices themselves can
only be passed to other methods, for example
\helpref{SetInsertionPoint}{wxtextctrlsetinsertionpoint} or
\helpref{SetSelection}{wxtextctrlsetselection}.
To summarize: never use the indices returned by (multiline) wxTextCtrl as
indices into the string it contains, but only as arguments to be passed back
to the other wxTextCtrl methods.
\wxheading{wxTextCtrl styles} \wxheading{wxTextCtrl styles}
Multi-line text controls support the styles, i.e. provide a possibility to set Multi-line text controls support the styles, i.e. provide a possibility to set
@@ -554,8 +577,9 @@ returned string is empty.
\constfunc{wxString}{GetValue}{\void} \constfunc{wxString}{GetValue}{\void}
Gets the contents of the control. Notice that for a multiline text control, Gets the contents of the control. Notice that for a multiline text control,
the lines will be separated by (Unix-style) $\backslash$n characters, even under the lines will be separated by (Unix-style) $\backslash$n characters, even
Windows where they are separated by a $\backslash$r$\backslash$n sequence in the native control. under Windows where they are separated by a $\backslash$r$\backslash$n
sequence in the native control.
\membersection{wxTextCtrl::IsEditable}\label{wxtextctrliseditable} \membersection{wxTextCtrl::IsEditable}\label{wxtextctrliseditable}