+++ /dev/null
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-%% Name: hvscroll.tex
-%% Purpose: wxHVScrolledWindow documentation
-%% Author: Vadim Zeitlin
-%% Modified by: Brad Anderson
-%% Created: 24.01.06
-%% RCS-ID: $Id$
-%% Copyright: (c) 2003 Vadim Zeitlin <vadim@wxwindows.org>
-%% License: wxWindows license
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-\section{\class{wxHVScrolledWindow}}\label{wxhvscrolledwindow}
-
-This class is strongly influenced by
-\helpref{wxVScrolledWindow}{wxvscrolledwindow}.
-Like wxVScrolledWindow, this class is here to provide an easy way to implement
-variable line sizes. The difference is that wxVScrolledWindow only works with
-vertical scrolling. This class extends the behavior of wxVScrolledWindow to
-the horizontal axis in addition to the vertical axis.
-
-The scrolling is also "virtual" in the sense that row widths and column heights
-only need to be known for the rows and columns that are currently visible.
-
-Like \helpref{wxVScrolledWindow}{wxvscrolledwindow}, this is a generalization
-of the \helpref{wxScrolledWindow}{wxscrolledwindow} class which can be only
-used when all rows have a constant height and columns have a constant width.
-Like wxVScrolledWinow it lacks some of wxScrolledWindow features such as
-scrolling another window or only scrolling a rectangle of the window and not
-its entire client area.
-
-If only vertical scrolling is needed, wxVScrolledWindow is recommended
-because it is simpler to use.
-
-There is no wxHScrolledWindow but horizontal-only scrolling is implemented
-easily enough with this class.
-
-To use this class, you need to derive from it and implement both the
-\helpref{OnGetRowHeight()}{wxhvscrolledwindowongetrowheight} and the
-\helpref{OnGetColumnWidth()}{wxhvscrolledwindowongetcolumnwidth} pure virtual
-methods. You also must call
-\helpref{SetRowColumnCounts}{wxhvscrolledwindowsetrowcolumncounts} to let the
-base class know how many rows and columns it should display. After these
-requirements are met scrolling is handled entirely by wxHVScrolledWindow. You
-only need to draw the visible part of contents in your {\tt OnPaint()} method
-as usual. You should use
-\helpref{GetVisibleRowsBegin()}{wxhvscrolledwindowgetvisiblerowsbegin},
-\helpref{GetVisibleColumnsBegin()}{wxhvscrolledwindowgetvisiblecolumnsbegin},
-\helpref{GetVisibleRowsEnd()}{wxhvscrolledwindowgetvisiblerowsend}, and
-\helpref{GetVisibleColumnsEnd()}{wxhvscrolledwindowgetvisiblecolumnsend} to
-determine which lines to to display. If physical scrolling is enabled the
-device context origin is shifted by the scroll position (through
-{\tt PrepareDC()}), child windows are moved as the window scrolls, and the
-pixels on the screen are moved to minimize the region that requires painting.
-Physical scrolling is enabled by default.
-
-\wxheading{Derived from}
-
-\helpref{wxPanel}{wxpanel}
-
-\wxheading{Include files}
-
-<wx/vscroll.h>
-
-
-\latexignore{\rtfignore{\wxheading{Members}}}
-
-
-\membersection{wxHVScrolledWindow::wxHVScrolledWindow}\label{wxhvscrolledwindowctor}
-
-\func{}{wxHVScrolledWindow}{\param{wxWindow* }{parent}, \param{wxWindowID }{id = wxID\_ANY}, \param{const wxPoint\& }{pos = wxDefaultPosition}, \param{const wxSize\& }{size = wxDefaultSize}, \param{long }{style = 0}, \param{const wxString\& }{name = wxPanelNameStr}}
-
-This is the normal constructor, no need to call Create() after using this one.
-
-Note that {\tt wxVSCROLL} and {\tt wxHSCROLL} are always automatically added to
-our style, there is no need to specify them explicitly.
-
-\func{}{wxHVScrolledWindow}{\void}
-
-Default constructor, you must call \helpref{Create()}{wxhvscrolledwindowcreate}
-later.
-
-\wxheading{Parameters}
-
-\docparam{parent}{The parent window, must not be {\tt NULL}}
-
-\docparam{id}{The identifier of this window, {\tt wxID\_ANY} by default}
-
-\docparam{pos}{The initial window position}
-
-\docparam{size}{The initial window size}
-
-\docparam{style}{The window style. There are no special style bits defined for
-this class.}
-
-\docparam{name}{The name for this window; usually not used}
-
-
-\membersection{wxHVScrolledWindow::Create}\label{wxhvscrolledwindowcreate}
-
-\func{bool}{Create}{\param{wxWindow* }{parent}, \param{wxWindowID }{id = wxID\_ANY}, \param{const wxPoint\& }{pos = wxDefaultPosition}, \param{const wxSize\& }{size = wxDefaultSize}, \param{long }{style = 0}, \param{const wxString\& }{name = wxPanelNameStr}}
-
-Same as the \helpref{non default ctor}{wxhvscrolledwindowctor} but returns
-status code: {\tt true} if ok, {\tt false} if the window couldn't have been created.
-
-Just as with the ctor above, both the {\tt wxVSCROLL} and the {\tt wxHSCROLL}
-styles are always used. There is no need to specify either explicitly.
-
-\membersection{wxHVScrolledWindow::EnablePhysicalScrolling}\label{wxhvscrolledwindowenablephysicalscrolling}
-
-\func{\void}{EnablePhysicalScrolling}{\param{bool }{scrolling = true}}
-
-With physical scrolling enabled the device origin is changed properly when a
-wxDC is prepared using {\tt PrepareDC()}, children are actually moved and layed
-out according to the current scroll position, and the contents of the window
-(pixels) are actually moved to reduce the amount of redraw needed.
-
-Physical scrolling is enabled by default but can be disable or re-enabled at
-any time. An example of when you'd want to disable it would be if you have
-statically positioned graphic elements or children you do not want to move
-while the window is being scrolled. If you disable physical scrolling you must
-manually adjust positioning for items within the scrolled window yourself.
-Also note that an unprepared wxDC requires you to do the same, regardless of
-the physical scrolling state.
-
-
-\membersection{wxHVScrolledWindow::EstimateTotalHeight}\label{wxhvscrolledwindowestimatetotalheight}
-
-\constfunc{virtual wxCoord}{EstimateTotalHeight}{\void}
-
-This protected function is used internally by wxHVScrolledWindow to estimate the
-total height of the window when
-\helpref{SetRowColumnCounts}{wxhvscrolledwindowsetrowcolumncounts}
-is called. The default implementation uses the brute force approach if the
-number of the items in the control is small enough. Otherwise, it tries to find
-the average row height using some rows in the beginning, middle and the end.
-
-If it is undesirable to query all these rows (some of which might be never
-shown) just for the total height calculation, you may override the function and
-provide your own guess using a better and/or faster method.
-
-Note that although returning a totally wrong value would still work, it risks
-causing some very strange scrollbar behaviour so this function should really
-try to make the best guess possible.
-
-
-\membersection{wxHVScrolledWindow::EstimateTotalWidth}\label{wxhvscrolledwindowestimatetotalwidth}
-
-\constfunc{virtual wxCoord}{EstimateTotalWidth}{\void}
-
-This protected function is used internally by wxHVScrolledWindow to estimate the
-total width of the window when
-\helpref{SetRowColumnCounts}{wxhvscrolledwindowsetrowcolumncounts}
-is called. The default implementation uses the brute force approach if the
-number of the items in the control is small enough. Otherwise, it tries to find
-the average column width using some columns in the beginning, middle and the end.
-
-If it is undesirable to query all these columns (some of which might be never
-shown) just for the total width calculation, you may override the function and
-provide your own guess using a better and/or faster method.
-
-Note that although returning a totally wrong value would still work, it risks
-causing some very strange scrollbar behaviour so this function should really
-try to make the best guess possible.
-
-
-\membersection{wxHVScrolledWindow::GetColumnCount}\label{wxhvscrolledwindowgetcolumncount}
-
-\constfunc{wxSize}{GetColumnCount}{\void}
-
-Get the number of columns this window contains (previously set by
-\helpref{SetRowColumnCounts()}{wxhvscrolledwindowsetrowcolumncounts})
-
-
-\membersection{wxHVScrolledWindow::GetRowCount}\label{wxhvscrolledwindowgetrowcount}
-
-\constfunc{wxSize}{GetRowCount}{\void}
-
-Get the number of rows this window contains (previously set by
-\helpref{SetRowColumnCounts()}{wxhvscrolledwindowsetrowcolumncounts})
-
-
-\membersection{wxHVScrolledWindow::GetRowColumnCounts}\label{wxhvscrolledwindowgetrowcolumncounts}
-
-\constfunc{wxSize}{GetRowColumnCounts}{\void}
-
-Get the number of rows (X or width) and columns (Y or height) this window
-contains (previously set
-by \helpref{SetRowColumnCounts()}{wxhvscrolledwindowsetrowcolumncounts})
-
-
-\membersection{wxHVScrolledWindow::GetVisibleBegin}\label{wxhvscrolledwindowgetvisiblebegin}
-
-\constfunc{wxPoint}{GetVisibleBegin}{\void}
-
-Returns the indicies of the first visible row (Y) and column (X).
-
-\wxheading{See also}
-
-\helpref{GetVisibleRowsBegin}{wxhvscrolledwindowgetvisiblerowsbegin}, \helpref{GetVisibleColumnsBegin}{wxhvscrolledwindowgetvisiblecolumnsbegin}
-
-
-\membersection{wxHVScrolledWindow::GetVisibleColumnsBegin}\label{wxhvscrolledwindowgetvisiblecolumnsbegin}
-
-\constfunc{size\_t}{GetVisibleColumnsBegin}{\void}
-
-Returns the index of the first currently visible column.
-
-\wxheading{See also}
-
-\helpref{GetVisibleColumnsEnd}{wxhvscrolledwindowgetvisiblecolumnsend}
-
-
-\membersection{wxHVScrolledWindow::GetVisibleColumnsEnd}\label{wxhvscrolledwindowgetvisiblecolumnsend}
-
-\constfunc{size\_t}{GetVisibleColumnsEnd}{\void}
-
-Returns the index of the first column after the currently visible page. If the
-return value is $0$ it means that no columns 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{GetColumnCount}{wxhvscrolledwindowgetcolumncount}.
-
-\wxheading{See also}
-
-\helpref{GetVisibleColumnsBegin}{wxhvscrolledwindowgetvisiblecolumnsbegin}
-
-
-\membersection{wxHVScrolledWindow::GetVisibleEnd}\label{wxhvscrolledwindowgetvisiblebegin}
-
-\constfunc{wxPoint}{GetVisibleEnd}{\void}
-
-Returns the indicies of the row and column after the last visible row (Y) and
-last visible column (X), respectively.
-
-\wxheading{See also}
-
-\helpref{GetVisibleRowsEnd}{wxhvscrolledwindowgetvisiblerowsend}, \helpref{GetVisibleColumnsEnd}{wxhvscrolledwindowgetvisiblecolumnsend}
-
-
-\membersection{wxHVScrolledWindow::GetVisibleRowsBegin}\label{wxhvscrolledwindowgetvisiblerowsbegin}
-
-\constfunc{size\_t}{GetVisibleRowsBegin}{\void}
-
-Returns the index of the first currently visible row.
-
-\wxheading{See also}
-
-\helpref{GetVisibleRowsEnd}{wxhvscrolledwindowgetvisiblerowsend}
-
-
-\membersection{wxHVScrolledWindow::GetVisibleRowsEnd}\label{wxhvscrolledwindowgetvisiblerowsend}
-
-\constfunc{size\_t}{GetVisibleRowsEnd}{\void}
-
-Returns the index of the first row after the currently visible page. If the
-return value is $0$ it means that no rows 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{GetRowCount}{wxhvscrolledwindowgetrowcount}.
-
-\wxheading{See also}
-
-\helpref{GetVisibleRowsBegin}{wxhvscrolledwindowgetvisiblerowsbegin}
-
-
-\membersection{wxHVScrolledWindow::HitTest}\label{wxhvscrolledwindowhittest}
-
-\constfunc{wxPoint}{HitTest}{\param{wxCoord }{x}, \param{wxCoord }{y}}
-
-\constfunc{wxPoint}{HitTest}{\param{const wxPoint\& }{pt}}
-
-Return the position (X as column, Y as row) of the cell occupying the specified
-position (in physical coordinates). A value of {\tt wxNOT\_FOUND} in either X,
-Y, or X and Y means it is outside the range availible rows and/or columns.
-
-
-\membersection{wxHVScrolledWindow::IsColumnVisible}\label{wxhvscrolledwindowiscolumnvisible}
-
-\constfunc{bool}{IsColumnVisible}{\param{size\_t}{column}}
-
-Returns {\tt true} if the given column is at least partially visible or
-{\tt false} otherwise.
-
-
-\membersection{wxHVScrolledWindow::IsRowVisible}\label{wxhvscrolledwindowisrowvisible}
-
-\constfunc{bool}{IsRowVisible}{\param{size\_t }{row}}
-
-Returns {\tt true} if the given row is at least partially visible or {\tt false}
-otherwise.
-
-
-\membersection{wxHVScrolledWindow::IsVisible}\label{wxhvscrolledwindowisvisible}
-
-\constfunc{bool}{IsVisible}{\param{size\_t }{row}, \param{size\_t}{column}}
-
-Returns {\tt true} if the given row and column are both at least partially
-visible or {\tt false} otherwise.
-
-
-\membersection{wxHVScrolledWindow::OnGetColumnWidth}\label{wxhvscrolledwindowongetcolumnwidth}
-
-\constfunc{wxCoord}{OnGetColumnWidth}{\param{size\_t }{n}}
-
-This protected pure virtual function must be overridden in the derived class
-and should return the width of the given column in pixels.
-
-\wxheading{See also}
-
-\helpref{OnGetColumnsWidthHint}{wxhvscrolledwindowongetcolumnswidthhint}
-
-
-\membersection{wxHVScrolledWindow::OnGetColumnsWidthHint}\label{wxhvscrolledwindowongetcolumnswidthhint}
-
-\constfunc{void}{OnGetColumnsWidthHint}{\param{size\_t }{columnMin}, \param{size\_t }{columnMax}}
-
-This function doesn't have to be overridden but it may be useful to do
-it if calculating the columns' heights is a relatively expensive operation
-as it gives the user code a possibility to calculate several of them at
-once.
-
-{\tt OnGetColumnsWidthHint()} is normally called just before
-\helpref{OnGetColumnWidth()}{wxhvscrolledwindowongetcolumnwidth} but you
-shouldn't rely on the latter being called for all columns in the interval
-specified here. It is also possible that OnGetColumnWidth() will be
-called for the columns outside of this interval, so this is really just a
-hint, not a promise.
-
-Finally note that {\it columnMin} is inclusive, while {\it columnMax} is exclusive,
-as usual.
-
-
-\membersection{wxHVScrolledWindow::OnGetRowHeight}\label{wxhvscrolledwindowongetrowheight}
-
-\constfunc{wxCoord}{OnGetRowHeight}{\param{size\_t }{n}}
-
-This protected pure virtual function must be overridden in the derived class
-and should return the height of the given row in pixels.
-
-\wxheading{See also}
-
-\helpref{OnGetRowsHeightHint}{wxhvscrolledwindowongetrowsheighthint}
-
-
-\membersection{wxHVScrolledWindow::OnGetRowsHeightHint}\label{wxhvscrolledwindowongetrowsheighthint}
-
-\constfunc{void}{OnGetRowsHeightHint}{\param{size\_t }{rowMin}, \param{size\_t }{rowMax}}
-
-This function doesn't have to be overridden but it may be useful to do
-it if calculating the row's heights is a relatively expensive operation
-as it gives the user code a possibility to calculate several of them at
-once.
-
-{\tt OnGetRowsHeightHint()} is normally called just before
-\helpref{OnGetRowHeight()}{wxhvscrolledwindowongetrowheight} but you
-shouldn't rely on the latter being called for all rows in the interval
-specified here. It is also possible that OnGetRowHeight() will be
-called for the rows outside of this interval, so this is really just a
-hint, not a promise.
-
-Finally note that {\it rowMin} is inclusive, while {\it rowMax} is exclusive,
-as usual.
-
-
-\membersection{wxHVScrolledWindow::RefreshColumn}\label{wxhvscrolledwindowrefreshcolumn}
-
-\func{void}{RefreshColumn}{\param{size\_t }{column}}
-
-Refreshes the specified column -- it will be redrawn during the next main loop
-iteration.
-
-
-\membersection{wxHVScrolledWindow::RefreshRow}\label{wxhvscrolledwindowrefreshrow}
-
-\func{void}{RefreshRow}{\param{size\_t }{row}}
-
-Refreshes the specified row -- it will be redrawn during the next main loop
-iteration.
-
-
-\membersection{wxHVScrolledWindow::RefreshRowColumn}\label{wxhvscrolledwindowrefreshrowcolumn}
-
-\func{void}{RefreshRowColumn}{\param{size\_t }{row}, \param{size\_t }{column}}
-
-Refreshes the specified cell -- it will be redrawn during the next main loop
-iteration.
-
-\wxheading{See also}
-
-\helpref{RefreshRowsColumns}{wxhvscrolledwindowrefreshrowscolumns}
-
-
-\membersection{wxHVScrolledWindow::RefreshColumns}\label{wxhvscrolledwindowrefreshcolumns}
-
-\func{void}{RefreshColumns}{\param{size\_ t}{fromColumn}, \param{size\_t }{toColumn}}
-
-Refreshes the columns between {\it fromColumn} and {\it toColumn} (inclusive).
-{\it fromColumn} should be less than or equal to {\it toColumn}.
-
-\wxheading{See also}
-
-\helpref{RefreshColumn}{wxhvscrolledwindowrefreshcolumn}
-
-
-\membersection{wxHVScrolledWindow::RefreshRows}\label{wxhvscrolledwindowrefreshrows}
-
-\func{void}{RefreshRows}{\param{size\_ t}{fromRow}, \param{size\_t }{toRow}}
-
-Refreshes the rows between {\it fromRow} and {\it toRow} (inclusive).
-{\it fromRow} should be less than or equal to {\it toRow}.
-
-\wxheading{See also}
-
-\helpref{RefreshRow}{wxhvscrolledwindowrefreshrow}
-
-
-\membersection{wxHVScrolledWindow::RefreshRowsColumns}\label{wxhvscrolledwindowrefreshrowscolumns}
-
-\func{void}{RefreshRowsColumns}{\param{size\_t }{fromRow}, \param{size\_t }{toRow}, \param{size\_ t}{fromColumn}, \param{size\_t }{toColumn}}
-
-Refreshes the region of cells between {\it fromRow}, {\it fromColumn} and
-{\it toRow}, {\it toColumn} (inclusive). {\it fromRow} and {\it fromColumn}
-should be less than or equal to {\it toRow} and {\it toColumn}, respectively.
-
-\wxheading{See also}
-
-\helpref{RefreshRowColumn}{wxhvscrolledwindowrefreshrowcolumn}
-
-
-\membersection{wxHVScrolledWindow::RefreshAll}\label{wxhvscrolledwindowrefreshall}
-
-\func{void}{RefreshAll}{\void}
-
-This function completely refreshes the control, recalculating the number of
-items shown on screen and repainting them. It should be called when the values
-returned by either \helpref{OnGetRowHeight}{wxhvscrolledwindowongetrowheight} or
-\helpref{OnGetColumnWidth}{wxhvscrolledwindowongetcolumnwidth} change for some
-reason and the window must be updated to reflect this.
-
-
-\membersection{wxHVScrolledWindow::ScrollColumns}\label{wxhvscrolledwindowscrollcolumns}
-
-\func{bool}{ScrollColumns}{\param{int }{columns}}
-
-Scroll by the specified number of columns which may be positive (to scroll
-right) or negative (to scroll left).
-
-Returns {\tt true} if the window was scrolled, {\tt false} otherwise (for
-example if we're trying to scroll right but we are already showing the last
-column).
-
-
-\membersection{wxHVScrolledWindow::ScrollRows}\label{wxhvscrolledwindowscrollrows}
-
-\func{bool}{ScrollRows}{\param{int }{rows}}
-
-Scroll by the specified number of rows which may be positive (to scroll
-down) or negative (to scroll up).
-
-Returns {\tt true} if the window was scrolled, {\tt false} otherwise (for
-example if we're trying to scroll down but we are already showing the last
-row).
-
-\wxheading{See also}
-
-\helpref{LineUp}{wxwindowlineup}, \helpref{LineDown}{wxwindowlinedown}
-
-
-\membersection{wxHVScrolledWindow::ScrollRowsColumns}\label{wxhvscrolledwindowscrollrowscolumns}
-
-\func{bool}{ScrollRowsColumns}{\param{int }{rows}, \param{int }{columns}}
-
-Scroll by the specified number of rows and columns which may be positive (to
-scroll down or right) or negative (to scroll up or left).
-
-Returns {\tt true} if the window was scrolled, {\tt false} otherwise (for
-example if we're trying to scroll down but we are already showing the last
-row).
-
-\wxheading{See also}
-
-\helpref{LineUp}{wxwindowlineup}, \helpref{LineDown}{wxwindowlinedown}
-
-
-\membersection{wxHVScrolledWindow::ScrollColumnPages}\label{wxhvscrolledwindowscrollcolumnpages}
-
-\func{bool}{ScrollColumnPages}{\param{int }{columnPages}}
-
-Scroll by the specified number of column pages, which may be positive (to
-scroll right) or negative (to scroll left).
-
-
-\membersection{wxHVScrolledWindow::ScrollPages}\label{wxhvscrolledwindowscrollpages}
-
-\func{bool}{ScrollPages}{\param{int }{rowPages}, \param{int }{columnPages}}
-
-Scroll by the specified number of row pages and column pages, both of which may
-be positive (to scroll down or right) or negative (to scroll up or left).
-
-\wxheading{See also}
-
-\helpref{ScrollRowsColumns}{wxhvscrolledwindowscrollrowscolumns},\\
-\helpref{PageUp}{wxwindowpageup}, \helpref{PageDown}{wxwindowpagedown}
-
-
-\membersection{wxHVScrolledWindow::ScrollRowPages}\label{wxhvscrolledwindowscrollrowpages}
-
-\func{bool}{ScrollRowPages}{\param{int }{rowPages}}
-
-Scroll by the specified number of row pages, which may be positive (to scroll
-down) or negative (to scroll up).
-
-\wxheading{See also}
-
-\helpref{PageUp}{wxwindowpageup}, \helpref{PageDown}{wxwindowpagedown}
-
-
-\membersection{wxHVScrolledWindow::ScrollToColumn}\label{wxhvscrolledwindowscrolltocolumn}
-
-\func{bool}{ScrollToColumn}{\param{size\_t }{column}}
-
-Scroll to the specified column. The specified column will be the first visible
-column on the left side afterwards.
-
-Return {\tt true} if we scrolled the window, {\tt false} if nothing was done.
-
-
-\membersection{wxHVScrolledWindow::ScrollToRow}\label{wxhvscrolledwindowscrolltorow}
-
-\func{bool}{ScrollToRow}{\param{size\_t }{row}}
-
-Scroll to the specified row. The specified column will be the first visible row
-on the top afterwards.
-
-Return {\tt true} if we scrolled the window, {\tt false} if nothing was done.
-
-
-\membersection{wxHVScrolledWindow::ScrollToRowColumn}\label{wxhvscrolledwindowscrolltorowcolumn}
-
-\func{bool}{ScrollToRowColumn}{\param{size\_t }{row}, \param{size\_t }{column}}
-
-Scroll to the specified row and column. The cell described will be the top left
-visible cell afterwards.
-
-Return {\tt true} if we scrolled the window, {\tt false} if nothing was done.
-
-
-\membersection{wxHVScrolledWindow::SetRowColumnCounts}\label{wxhvscrolledwindowsetrowcolumncounts}
-
-\func{void}{SetLineCount}{\param{size\_t }{row}, \param{size\_t }{column}}
-
-Set the number of rows and columns the window contains. The derived class must
-provide the heights for all rows and the widths for all columns with indices up
-to the respective values given here in its
-\helpref{OnGetRowHeight()}{wxhvscrolledwindowongetrowheight} and
-\helpref{OnGetColumnWidth()}{wxhvscrolledwindowongetcolumnwidth}
-implementations.