set up scrollbars correctly when we don't need them (fixes the problems reported...

[wxWidgets.git] / docs / latex / wx / scrolwin.tex

diff --git a/docs/latex/wx/scrolwin.tex b/docs/latex/wx/scrolwin.tex
index 328daa8b21ee6b6a56a9a3321fe07666f1bf9b5b..dd1273f9cecc9ae327f44515d1f84f7f4e1a0cc2 100644 (file)
--- a/docs/latex/wx/scrolwin.tex
+++ b/docs/latex/wx/scrolwin.tex
@@ -4,22 +4,82 @@ The wxScrolledWindow class manages scrolling for its client area, transforming
 the coordinates according to the scrollbar positions, and setting the
 scroll positions, thumb sizes and ranges according to the area in view.
 
 the coordinates according to the scrollbar positions, and setting the
 scroll positions, thumb sizes and ranges according to the area in view.
 

-As with all windows, an application can draw onto a wxScrolledWindow using a \helpref{device context}{dcoverview}.
-
-You have the option of handling the \helpref{OnPaint}{wxscrolledwindowonpaint} handler
-or overriding the \helpref{OnDraw}{wxscrolledwindowondraw} function, which is passed
-a pre-scrolled device context (prepared by \helpref{PrepareDC}{wxscrolledwindowpreparedc}).
-
-If you don't wish to calculate your own scrolling, you must call PrepareDC when not drawing from
+Starting from version 2.4 of wxWidgets, there are several ways to use a
+wxScrolledWindow. In particular, there are now three ways to set the
+size of the scrolling area:
+
+One way is to set the scrollbars directly using a call to
+\helpref{wxScrolledWindow::SetScrollbars}{wxscrolledwindowsetscrollbars}.
+This is the way it used to be in any previous version of wxWidgets
+and it will be kept for backwards compatibility.
+
+An additional method of manual control, which requires a little less
+computation of your own, is to set the total size of the scrolling area by
+calling either \helpref{wxWindow::SetVirtualSize}{wxwindowsetvirtualsize},
+or \helpref{wxWindow::FitInside}{wxwindowfitinside}, and setting the
+scrolling increments for it by calling 
+\helpref{wxScrolledWindow::SetScrollRate}{wxscrolledwindowsetscrollrate}.
+Scrolling in some orientation is enabled by setting a non zero increment
+for it.
+
+The most automatic and newest way is to simply let sizers determine the
+scrolling area. This is now the default when you set an interior sizer
+into a wxScrolledWindow with \helpref{wxWindow::SetSizer}{wxwindowsetsizer}.
+The scrolling area will be set to the size requested by the sizer and
+the scrollbars will be assigned for each orientation according to the need
+for them and the scrolling increment set by 
+\helpref{wxScrolledWindow::SetScrollRate}{wxscrolledwindowsetscrollrate}.
+As above, scrolling is only enabled in orientations with a non-zero
+increment.  You can influence the minimum size of the scrolled area
+controlled by a sizer by calling
+\helpref{wxWindow::SetVirtualSizeHints}{wxwindowsetvirtualsizehints}.
+(calling \helpref{wxScrolledWindow::SetScrollbars}{wxscrolledwindowsetscrollbars}
+ has analogous effects in wxWidgets 2.4 -- in later versions it may not continue
+ to override the sizer)
+
+Note:  if Maximum size hints are still supported by SetVirtualSizeHints, use
+them at your own dire risk.  They may or may not have been removed for 2.4,
+but it really only makes sense to set minimum size hints here.  We should
+probably replace SetVirtualSizeHints with SetMinVirtualSize or similar
+and remove it entirely in future.
+
+As with all windows, an application can draw onto a wxScrolledWindow using
+a \helpref{device context}{dcoverview}.
+
+You have the option of handling the OnPaint handler
+or overriding the \helpref{OnDraw}{wxscrolledwindowondraw} function, which is
+passed a pre-scrolled device context (prepared by 
+\helpref{DoPrepareDC}{wxscrolledwindowdopreparedc}).
+
+If you don't wish to calculate your own scrolling, you must call DoPrepareDC when not drawing from

 within OnDraw, to set the device origin for the device context according to the current
 scroll position.
 
 within OnDraw, to set the device origin for the device context according to the current
 scroll position.
 

+A wxScrolledWindow will normally scroll itself and therefore its child windows as well. It
+might however be desired to scroll a different window than itself: e.g. when designing a
+spreadsheet, you will normally only have to scroll the (usually white) cell area, whereas the
+(usually grey) label area will scroll very differently. For this special purpose, you can
+call \helpref{SetTargetWindow}{wxscrolledwindowsettargetwindow} which means that pressing
+the scrollbars will scroll a different window.
+
+Note that the underlying system knows nothing about scrolling coordinates, so that all system
+functions (mouse events, expose events, refresh calls etc) as well as the position of subwindows
+are relative to the "physical" origin of the scrolled window. If the user insert a child window at
+position (10,10) and scrolls the window down 100 pixels (moving the child window out of the visible
+area), the child window will report a position of (10,-90).
+
+

 \wxheading{Derived from}
 
 \wxheading{Derived from}
 

+\helpref{wxPanel}{wxpanel}\\

 \helpref{wxWindow}{wxwindow}\\
 \helpref{wxEvtHandler}{wxevthandler}\\
 \helpref{wxObject}{wxobject}
 
 \helpref{wxWindow}{wxwindow}\\
 \helpref{wxEvtHandler}{wxevthandler}\\
 \helpref{wxObject}{wxobject}
 

+\wxheading{Include files}
+
+<wx/scrolwin.h>
+

 \wxheading{Window styles}
 
 \twocolwidtha{5cm}
 \wxheading{Window styles}
 
 \twocolwidtha{5cm}


@@ -38,11 +98,13 @@ to build your own scroll behaviour.
 
 \wxheading{See also}
 
 
 \wxheading{See also}
 

-\helpref{wxScrollBar}{wxscrollbar}, \helpref{wxClientDC}{wxclientdc}, \helpref{wxPaintDC}{wxpaintdc}
+\helpref{wxScrollBar}{wxscrollbar}, \helpref{wxClientDC}{wxclientdc},\\
+\helpref{wxPaintDC}{wxpaintdc}, \helpref{wxVScrolledWindow}{wxvscrolledwindow}

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

-\membersection{wxScrolledWindow::wxScrolledWindow}\label{wxscrolledwindowconstr}
+
+\membersection{wxScrolledWindow::wxScrolledWindow}\label{wxscrolledwindowctor}

 
 \func{}{wxScrolledWindow}{\void}
 
 
 \func{}{wxScrolledWindow}{\void}
 


@@ -76,12 +138,62 @@ The window is initially created without visible scrollbars.
 Call \helpref{wxScrolledWindow::SetScrollbars}{wxscrolledwindowsetscrollbars} to
 specify how big the virtual window size should be.
 
 Call \helpref{wxScrolledWindow::SetScrollbars}{wxscrolledwindowsetscrollbars} to
 specify how big the virtual window size should be.
 

-\membersection{wxScrolledWindow::\destruct{wxScrolledWindow}}
+
+\membersection{wxScrolledWindow::\destruct{wxScrolledWindow}}\label{wxscrolledwindowdtor}

 
 \func{}{\destruct{wxScrolledWindow}}{\void}
 
 Destructor.
 
 
 \func{}{\destruct{wxScrolledWindow}}{\void}
 
 Destructor.
 

+
+\membersection{wxScrolledWindow::CalcScrolledPosition}\label{wxscrolledwindowcalcscrolledposition}
+
+\constfunc{void}{CalcScrolledPosition}{
+   \param{int }{x},
+   \param{int }{y},
+   \param{int *}{xx}
+   \param{int *}{yy}}
+
+Translates the logical coordinates to the device ones. For example, if a window is
+scrolled 10 pixels to the bottom, the device coordinates of the origin are (0, 0)
+(as always), but the logical coordinates are (0, 10) and so the call to
+CalcScrolledPosition(0, 10, \&xx, \&yy) will return 0 in yy.
+
+\wxheading{See also}
+
+\helpref{CalcUnscrolledPosition}{wxscrolledwindowcalcunscrolledposition}
+
+\pythonnote{The wxPython version of this methods accepts only two
+parameters and returns xx and yy as a tuple of values.}
+
+\perlnote{In wxPerl this method takes two parameters and returns a
+2-element list {\tt ( xx, yy )}.}
+
+
+\membersection{wxScrolledWindow::CalcUnscrolledPosition}\label{wxscrolledwindowcalcunscrolledposition}
+
+\constfunc{void}{CalcUnscrolledPosition}{
+   \param{int }{x},
+   \param{int }{y},
+   \param{int *}{xx}
+   \param{int *}{yy}}
+
+Translates the device coordinates to the logical ones. For example, if a window is
+scrolled 10 pixels to the bottom, the device coordinates of the origin are (0, 0)
+(as always), but the logical coordinates are (0, 10) and so the call to
+CalcUnscrolledPosition(0, 0, \&xx, \&yy) will return 10 in yy.
+
+\wxheading{See also}
+
+\helpref{CalcScrolledPosition}{wxscrolledwindowcalcscrolledposition}
+
+\pythonnote{The wxPython version of this methods accepts only two
+parameters and returns xx and yy as a tuple of values.}
+
+\perlnote{In wxPerl this method takes two parameters and returns a
+2-element list {\tt ( xx, yy )}.}
+
+

 \membersection{wxScrolledWindow::Create}\label{wxscrolledwindowcreate}
 
 \func{bool}{Create}{\param{wxWindow*}{ parent}, \param{wxWindowID }{id = -1},\rtfsp
 \membersection{wxScrolledWindow::Create}\label{wxscrolledwindowcreate}
 
 \func{bool}{Create}{\param{wxWindow*}{ parent}, \param{wxWindowID }{id = -1},\rtfsp


@@ -89,9 +201,10 @@ Destructor.
 \param{long}{ style = wxHSCROLL \pipe wxVSCROLL}, \param{const wxString\& }{name = ``scrolledWindow"}}
 
 Creates the window for two-step construction. Derived classes
 \param{long}{ style = wxHSCROLL \pipe wxVSCROLL}, \param{const wxString\& }{name = ``scrolledWindow"}}
 
 Creates the window for two-step construction. Derived classes

-should call or replace this function. See \helpref{wxScrolledWindow::wxScrolledWindow}{wxscrolledwindowconstr}\rtfsp
+should call or replace this function. See \helpref{wxScrolledWindow::wxScrolledWindow}{wxscrolledwindowctor}\rtfsp

 for details.
 
 for details.
 

+

 \membersection{wxScrolledWindow::EnableScrolling}\label{wxscrolledwindowenablescrolling}
 
 \func{void}{EnableScrolling}{\param{const bool}{ xScrolling}, \param{const bool}{ yScrolling}}
 \membersection{wxScrolledWindow::EnableScrolling}\label{wxscrolledwindowenablescrolling}
 
 \func{void}{EnableScrolling}{\param{const bool}{ xScrolling}, \param{const bool}{ yScrolling}}


@@ -100,19 +213,22 @@ Enable or disable physical scrolling in the given direction. Physical
 scrolling is the physical transfer of bits up or down the
 screen when a scroll event occurs. If the application scrolls by a
 variable amount (e.g. if there are different font sizes) then physical
 scrolling is the physical transfer of bits up or down the
 screen when a scroll event occurs. If the application scrolls by a
 variable amount (e.g. if there are different font sizes) then physical

-scrolling will not work, and you should switch it off.
+scrolling will not work, and you should switch it off. Note that you
+will have to reposition child windows yourself, if physical scrolling
+is disabled.

 
 \wxheading{Parameters}
 
 
 \wxheading{Parameters}
 

-\docparam{xScrolling}{If TRUE, enables physical scrolling in the x direction.}
+\docparam{xScrolling}{If true, enables physical scrolling in the x direction.}

 
 

-\docparam{yScrolling}{If TRUE, enables physical scrolling in the y direction.}
+\docparam{yScrolling}{If true, enables physical scrolling in the y direction.}

 
 \wxheading{Remarks}
 
 Physical scrolling may not be available on all platforms. Where it is available, it is enabled
 by default.
 
 
 \wxheading{Remarks}
 
 Physical scrolling may not be available on all platforms. Where it is available, it is enabled
 by default.
 

+

 \membersection{wxScrolledWindow::GetScrollPixelsPerUnit}\label{wxscrolledwindowgetscrollpixelsperunit}
 
 \constfunc{void}{GetScrollPixelsPerUnit}{\param{int* }{xUnit}, \param{int* }{yUnit}}
 \membersection{wxScrolledWindow::GetScrollPixelsPerUnit}\label{wxscrolledwindowgetscrollpixelsperunit}
 
 \constfunc{void}{GetScrollPixelsPerUnit}{\param{int* }{xUnit}, \param{int* }{yUnit}}


@@ -130,8 +246,46 @@ scrolling in that direction.
 \wxheading{See also}
 
 \helpref{wxScrolledWindow::SetScrollbars}{wxscrolledwindowsetscrollbars},\rtfsp
 \wxheading{See also}
 
 \helpref{wxScrolledWindow::SetScrollbars}{wxscrolledwindowsetscrollbars},\rtfsp

-\helpref{wxScrolledWindow::GetVirtualSize}{wxscrolledwindowgetvirtualsize},\rtfsp
-\helpref{wxWindow::GetScrollPage}{wxwindowgetscrollpage}
+\helpref{wxScrolledWindow::GetVirtualSize}{wxscrolledwindowgetvirtualsize}
+
+\pythonnote{The wxPython version of this methods accepts no
+parameters and returns a tuple of values for xUnit and yUnit.}
+
+\perlnote{In wxPerl this method takes no parameters and returns a
+2-element list {\tt ( xUnit, yUnit )}.}
+
+
+\membersection{wxScrolledWindow::GetViewStart}\label{wxscrolledwindowgetviewstart}
+
+\constfunc{void}{GetViewStart}{\param{int* }{x}, \param{int* }{ y}}
+
+Get the position at which the visible portion of the window starts.
+
+\wxheading{Parameters}
+
+\docparam{x}{Receives the first visible x position in scroll units.}
+
+\docparam{y}{Receives the first visible y position in scroll units.}
+
+\wxheading{Remarks}
+
+If either of the scrollbars is not at the home position, {\it x} and/or
+\rtfsp{\it y} will be greater than zero.  Combined with \helpref{wxWindow::GetClientSize}{wxwindowgetclientsize},
+the application can use this function to efficiently redraw only the
+visible portion of the window.  The positions are in logical scroll
+units, not pixels, so to convert to pixels you will have to multiply
+by the number of pixels per scroll increment.
+
+\wxheading{See also}
+
+\helpref{wxScrolledWindow::SetScrollbars}{wxscrolledwindowsetscrollbars}
+
+\pythonnote{The wxPython version of this methods accepts no
+parameters and returns a tuple of values for x and y.}
+
+\perlnote{In wxPerl this method takes no parameters and returns a
+2-element list {\tt ( x, y )}.}
+

 
 \membersection{wxScrolledWindow::GetVirtualSize}\label{wxscrolledwindowgetvirtualsize}
 
 
 \membersection{wxScrolledWindow::GetVirtualSize}\label{wxscrolledwindowgetvirtualsize}
 


@@ -155,23 +309,30 @@ to translate these units to logical units.
 \wxheading{See also}
 
 \helpref{wxScrolledWindow::SetScrollbars}{wxscrolledwindowsetscrollbars},\rtfsp
 \wxheading{See also}
 
 \helpref{wxScrolledWindow::SetScrollbars}{wxscrolledwindowsetscrollbars},\rtfsp

-\helpref{wxScrolledWindow::GetScrollPixelsPerUnit}{wxscrolledwindowgetscrollpixelsperunit},\rtfsp
-\helpref{wxWindow::GetScrollPage}{wxwindowgetscrollpage}
+\helpref{wxScrolledWindow::GetScrollPixelsPerUnit}{wxscrolledwindowgetscrollpixelsperunit}
+
+\pythonnote{The wxPython version of this methods accepts no
+parameters and returns a tuple of values for x and y.}
+
+\perlnote{In wxPerl this method takes no parameters and returns a
+2-element list {\tt ( x, y )}.}
+

 
 \membersection{wxScrolledWindow::IsRetained}\label{wxscrolledwindowisretained}
 
 \constfunc{bool}{IsRetained}{\void}
 
 
 \membersection{wxScrolledWindow::IsRetained}\label{wxscrolledwindowisretained}
 
 \constfunc{bool}{IsRetained}{\void}
 

-TRUE if the window has a backing bitmap.
+Motif only: true if the window has a backing bitmap.

 
 

-\membersection{wxScrolledWindow::PrepareDC}\label{wxscrolledwindowpreparedc}

 
 

-\func{void}{PrepareDC}{\param{wxDC\& }{dc}}
+\membersection{wxScrolledWindow::DoPrepareDC}\label{wxscrolledwindowdopreparedc}
+
+\func{void}{DoPrepareDC}{\param{wxDC\& }{dc}}

 
 Call this function to prepare the device context for drawing a scrolled image. It
 sets the device origin according to the current scroll position.
 
 
 Call this function to prepare the device context for drawing a scrolled image. It
 sets the device origin according to the current scroll position.
 

-PrepareDC is called automatically within the default \helpref{wxScrolledWindow::OnPaint}{wxscrolledwindowonpaint} event
+DoPrepareDC is called automatically within the default wxScrolledWindow::OnPaint event

 handler, so your \helpref{wxScrolledWindow::OnDraw}{wxscrolledwindowondraw} override
 will be passed a 'pre-scrolled' device context. However, if you wish to draw from
 outside of OnDraw (via OnPaint), or you wish to implement OnPaint yourself, you must
 handler, so your \helpref{wxScrolledWindow::OnDraw}{wxscrolledwindowondraw} override
 will be passed a 'pre-scrolled' device context. However, if you wish to draw from
 outside of OnDraw (via OnPaint), or you wish to implement OnPaint yourself, you must


@@ -181,7 +342,7 @@ call this function yourself. For example:
 void MyWindow::OnEvent(wxMouseEvent& event)
 {
   wxClientDC dc(this);
 void MyWindow::OnEvent(wxMouseEvent& event)
 {
   wxClientDC dc(this);

-  PrepareDC(dc);
+  DoPrepareDC(dc);

 
   dc.SetPen(*wxBLACK_PEN);
   float x, y;
 
   dc.SetPen(*wxBLACK_PEN);
   float x, y;


@@ -195,49 +356,29 @@ void MyWindow::OnEvent(wxMouseEvent& event)
 }
 \end{verbatim}
 
 }
 \end{verbatim}
 

+

 \membersection{wxScrolledWindow::OnDraw}\label{wxscrolledwindowondraw}
 
 \func{virtual void}{OnDraw}{\param{wxDC\& }{dc}}
 
 \membersection{wxScrolledWindow::OnDraw}\label{wxscrolledwindowondraw}
 
 \func{virtual void}{OnDraw}{\param{wxDC\& }{dc}}
 

-Called by the default \helpref{wxScrolledWindow::OnPaint}{wxscrolledwindowonpaint} implementation
-to allow the application to define painting behaviour without having to worry about
-calling \helpref{wxScrolledWindow::PrepareDC}{wxscrolledwindowpreparedc}.
-
-\membersection{wxScrolledWindow::OnPaint}\label{wxscrolledwindowonpaint}
-
-\func{void}{OnPaint}{\param{wxPaintEvent\& }{event}}
-
-Sent to the window when the window must be refreshed.
-
-For more details, see \helpref{wxWindow::OnPaint}{wxwindowonpaint}.
-
-The default implementation for wxScrolledWindow's OnPaint handler is simply:
-
-\begin{verbatim}
-void wxScrolledWindow::OnPaint(wxPaintEvent& event)
-{
-       wxPaintDC dc(this);
-       PrepareDC(dc);
-
-       OnDraw(dc);
-}
-\end{verbatim}
+Called by the default paint event handler to allow the application to define
+painting behaviour without having to worry about calling 
+\helpref{wxScrolledWindow::DoPrepareDC}{wxscrolledwindowdopreparedc}.

 
 

-\membersection{wxScrolledWindow::OnScroll}\label{wxscrolledwindowonscroll}
+Instead of overriding this function you may also just process the paint event
+in the derived class as usual, but then you will have to call DoPrepareDC()
+yourself.

 
 

-\func{void}{OnScroll}{\param{wxScrollEvent\& }{event}}

 
 

-Override this function to intercept scroll events. This
-member function implements the default scroll behaviour. If
-you do not call the default function, you will have to manage
-all scrolling behaviour including drawing the window contents
-at an appropriate position relative to the scrollbars.
+\membersection{wxScrolledWindow::PrepareDC}\label{wxscrolledwindowpreparedc}

 
 

-For more details, see \helpref{wxWindow::OnScroll}{wxwindowonscroll}.
+\func{void}{PrepareDC}{\param{wxDC\& }{dc}}

 
 

-\wxheading{See also}
+This function is for backwards compatibility only and simply calls 
+\helpref{DoPrepareDC}{wxscrolledwindowdopreparedc} now. Notice that it is 
+\emph{not} called by the default paint event handle (DoPrepareDC() is), so
+overriding this method in your derived class is useless.

 
 

-\helpref{wxScrollEvent}{wxscrollevent}

 
 \membersection{wxScrolledWindow::Scroll}\label{wxscrolledwindowscroll}
 
 
 \membersection{wxScrolledWindow::Scroll}\label{wxscrolledwindowscroll}
 


@@ -263,11 +404,13 @@ that direction).
 \helpref{wxScrolledWindow::SetScrollbars}{wxscrolledwindowsetscrollbars},\rtfsp
 \helpref{wxScrolledWindow::GetScrollPixelsPerUnit}{wxscrolledwindowgetscrollpixelsperunit}
 
 \helpref{wxScrolledWindow::SetScrollbars}{wxscrolledwindowsetscrollbars},\rtfsp
 \helpref{wxScrolledWindow::GetScrollPixelsPerUnit}{wxscrolledwindowgetscrollpixelsperunit}
 

+

 \membersection{wxScrolledWindow::SetScrollbars}\label{wxscrolledwindowsetscrollbars}
 
 \func{void}{SetScrollbars}{\param{int}{ pixelsPerUnitX}, \param{int}{ pixelsPerUnitY},\rtfsp
 \param{int}{ noUnitsX}, \param{int}{ noUnitsY},\rtfsp
 \membersection{wxScrolledWindow::SetScrollbars}\label{wxscrolledwindowsetscrollbars}
 
 \func{void}{SetScrollbars}{\param{int}{ pixelsPerUnitX}, \param{int}{ pixelsPerUnitY},\rtfsp
 \param{int}{ noUnitsX}, \param{int}{ noUnitsY},\rtfsp

-\param{int }{xPos = 0}, \param{int}{ yPos = 0}}
+\param{int }{xPos = 0}, \param{int}{ yPos = 0},\rtfsp
+\param{bool }{noRefresh = false}}

 
 Sets up vertical and/or horizontal scrollbars.
 
 
 Sets up vertical and/or horizontal scrollbars.
 


@@ -285,6 +428,8 @@ Sets up vertical and/or horizontal scrollbars.
 
 \docparam{yPos}{Position to initialize the scrollbars in the vertical direction, in scroll units.}
 
 
 \docparam{yPos}{Position to initialize the scrollbars in the vertical direction, in scroll units.}
 

+\docparam{noRefresh}{Will not refresh window if true.}
+

 \wxheading{Remarks}
 
 The first pair of parameters give the number of pixels per `scroll step', i.e. amount
 \wxheading{Remarks}
 
 The first pair of parameters give the number of pixels per `scroll step', i.e. amount


@@ -310,28 +455,23 @@ scroll steps may be variable according to the position in the document, it will
 necessary to derive a new class from wxWindow, overriding {\bf OnSize} and
 adjusting the scrollbars appropriately.
 
 necessary to derive a new class from wxWindow, overriding {\bf OnSize} and
 adjusting the scrollbars appropriately.
 

-\membersection{wxScrolledWindow::ViewStart}\label{wxscrolledwindowviewstart}
+\wxheading{See also}

 
 

-\constfunc{void}{ViewStart}{\param{int* }{x}, \param{int* }{ y}}
+\helpref{wxWindow::SetVirtualSize}{wxwindowsetvirtualsize}

 
 

-Get the position at which the visible portion of the window starts.

 
 

-\wxheading{Parameters}
+\membersection{wxScrolledWindow::SetScrollRate}\label{wxscrolledwindowsetscrollrate}

 
 

-\docparam{x}{Receives the first visible x position in scroll units.}
+\func{void}{SetScrollRate}{\param{int}{ xstep}, \param{int}{ ystep}}

 
 

-\docparam{y}{Receives the first visible y position in scroll units.}
+Set the horizontal and vertical scrolling increment only. See the pixelsPerUnit
+parameter in SetScrollbars.

 
 

-\wxheading{Remarks}

 
 

-If either of the scrollbars is not at the home position, {\it x} and/or
-\rtfsp{\it y} will be greater than zero.  Combined with \helpref{wxWindow::GetClientSize}{wxwindowgetclientsize},
-the application can use this function to efficiently redraw only the
-visible portion of the window.  The positions are in logical scroll
-units, not pixels, so to convert to pixels you will have to multiply
-by the number of pixels per scroll increment.
+\membersection{wxScrolledWindow::SetTargetWindow}\label{wxscrolledwindowsettargetwindow}

 
 

-\wxheading{See also}
+\func{void}{SetTargetWindow}{\param{wxWindow* }{window}}

 
 

-\helpref{wxScrolledWindow::SetScrollbars}{wxscrolledwindowsetscrollbars}
+Call this function to tell wxScrolledWindow to perform the actual scrolling on
+a different window (and not on itself).