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added GetVisibleBegin/End() to complement/replace GetFirst/LastVisibleLine() and use them in the code to fix problems when the control is empty and GetLastVisibleLine() returns (size_t)-1 (closes bug 1176561)

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@33360 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin
2005-04-05 22:43:41 +00:00
parent 9c2a1d53c0
commit dd932cbe1c
3 changed files with 75 additions and 22 deletions
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37
docs/latex/wx/vscroll.tex
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@@ -115,12 +115,22 @@ try to make the best guess possible.
Returns the index of the first currently visible line.
This is same as \helpref{GetVisibleBegin}{wxvscrolledwindowgetvisiblebegin} and
exists only for symmetry with \helpref{GetLastVisibleLine}{wxvscrolledwindowgetlastvisibleline}.
\membersection{wxVScrolledWindow::GetLastVisibleLine}\label{wxvscrolledwindowgetlastvisibleline}
\constfunc{size\_t}{GetLastVisibleLine}{\void}
Returns the index of the last currently visible line.
Returns the index of the last currently visible line. Note that this method
returns \texttt{(size\_t)-1} (i.e. a huge positive number) if the control is
empty so if this is possible you should use \helpref{GetVisibleEnd}{wxvscrolledwindowgetvisibleend}
instead.
\wxheading{See also}
\helpref{GetFirstVisibleLine}{wxvscrolledwindowgetfirstvisibleline}
\membersection{wxVScrolledWindow::GetLineCount}\label{wxvscrolledwindowgetlinecount}
@@ -131,6 +141,31 @@ Get the number of lines this window contains (previously set by
\helpref{SetLineCount()}{wxvscrolledwindowsetlinecount})
\membersection{wxVScrolledWindow::GetVisibleBegin}\label{wxvscrolledwindowgetvisiblebegin}
\constfunc{size\_t}{GetVisibleBegin}{\void}
Returns the index of the first currently visible line.
\wxheading{See also}
\helpref{GetVisibleEnd}{wxvscrolledwindowgetvisibleend}
\membersection{wxVScrolledWindow::GetVisibleEnd}\label{wxvscrolledwindowgetvisibleend}
\constfunc{size\_t}{GetVisibleEnd}{\void}
Returns the index of the first line after the currently visible one. If the
return value is $0$ it means that no lines are currently shown (which only
happens if the control is empty). Note that the index returned by this method
is not always a valid index as it may be equal to \helpref{GetLineCount}{wxvscrolledwindowsetlinecount}.
\wxheading{See also}
\helpref{GetVisibleBegin}{wxvscrolledwindowgetvisiblebegin}
\membersection{wxVScrolledWindow::HitTest}\label{wxvscrolledwindowhittest}
\constfunc{int}{HitTest}{\param{wxCoord }{x}, \param{wxCoord }{y}}