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}.
+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{PrepareDC}{wxscrolledwindowpreparedc}).
+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 PrepareDC when not drawing from
+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.
\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}}}
-\membersection{wxScrolledWindow::wxScrolledWindow}\label{wxscrolledwindowconstr}
+
+\membersection{wxScrolledWindow::wxScrolledWindow}\label{wxscrolledwindowctor}
\func{}{wxScrolledWindow}{\void}
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.
+
\membersection{wxScrolledWindow::CalcScrolledPosition}\label{wxscrolledwindowcalcscrolledposition}
\constfunc{void}{CalcScrolledPosition}{
\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}{
\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
\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.
+
\membersection{wxScrolledWindow::EnableScrolling}\label{wxscrolledwindowenablescrolling}
-\func{void}{EnableScrolling}{\param{const bool}{ xScrolling}, \param{const bool}{ yScrolling}}
+\func{void}{EnableScrolling}{\param{bool}{ xScrolling}, \param{bool}{ yScrolling}}
Enable or disable physical scrolling in the given direction. Physical
scrolling is the physical transfer of bits up or down the
\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.
+
\membersection{wxScrolledWindow::GetScrollPixelsPerUnit}\label{wxscrolledwindowgetscrollpixelsperunit}
\constfunc{void}{GetScrollPixelsPerUnit}{\param{int* }{xUnit}, \param{int* }{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}}
\perlnote{In wxPerl this method takes no parameters and returns a
2-element list {\tt ( x, y )}.}
+
\membersection{wxScrolledWindow::GetVirtualSize}\label{wxscrolledwindowgetvirtualsize}
\constfunc{void}{GetVirtualSize}{\param{int* }{x}, \param{int* }{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}
-Motif only: 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.
-PrepareDC is called automatically within the default wxScrolledWindow::OnPaint 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
void MyWindow::OnEvent(wxMouseEvent& event)
{
wxClientDC dc(this);
- PrepareDC(dc);
+ DoPrepareDC(dc);
dc.SetPen(*wxBLACK_PEN);
float x, y;
}
\end{verbatim}
+
\membersection{wxScrolledWindow::OnDraw}\label{wxscrolledwindowondraw}
\func{virtual void}{OnDraw}{\param{wxDC\& }{dc}}
Called by the default paint event handler to allow the application to define
-painting behaviour without having to worry about calling
-\helpref{wxScrolledWindow::PrepareDC}{wxscrolledwindowpreparedc}.
+painting behaviour without having to worry about calling
+\helpref{wxScrolledWindow::DoPrepareDC}{wxscrolledwindowdopreparedc}.
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 PrepareDC()
+in the derived class as usual, but then you will have to call DoPrepareDC()
yourself.
+
+\membersection{wxScrolledWindow::PrepareDC}\label{wxscrolledwindowpreparedc}
+
+\func{void}{PrepareDC}{\param{wxDC\& }{dc}}
+
+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.
+
+
\membersection{wxScrolledWindow::Scroll}\label{wxscrolledwindowscroll}
\func{void}{Scroll}{\param{int}{ x}, \param{int}{ y}}
\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
\param{int }{xPos = 0}, \param{int}{ yPos = 0},\rtfsp
-\param{bool }{noRefresh = FALSE}}
+\param{bool }{noRefresh = false}}
Sets up vertical and/or horizontal scrollbars.
\docparam{yPos}{Position to initialize the scrollbars in the vertical direction, in scroll units.}
-\docparam{noRefresh}{Will not refresh window if TRUE.}
+\docparam{noRefresh}{Will not refresh window if true.}
\wxheading{Remarks}
\helpref{wxWindow::SetVirtualSize}{wxwindowsetvirtualsize}
+
\membersection{wxScrolledWindow::SetScrollRate}\label{wxscrolledwindowsetscrollrate}
-\func{void}{SetScrollRate}{\param{int}{xstep}, \param{int}{ystep}}
+\func{void}{SetScrollRate}{\param{int}{ xstep}, \param{int}{ ystep}}
-Set the horizontal and vertical scrolling increment only. See the pixelsPerUnit
+Set the horizontal and vertical scrolling increment only. See the pixelsPerUnit
parameter in SetScrollbars.
+
\membersection{wxScrolledWindow::SetTargetWindow}\label{wxscrolledwindowsettargetwindow}
\func{void}{SetTargetWindow}{\param{wxWindow* }{window}}
Call this function to tell wxScrolledWindow to perform the actual scrolling on
-a different window (not on itself).
+a different window (and not on itself).
projects / wxWidgets.git / blobdiff